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avcodec.h
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1 /*
2  * copyright (c) 2001 Fabrice Bellard
3  *
4  * This file is part of FFmpeg.
5  *
6  * FFmpeg is free software; you can redistribute it and/or
7  * modify it under the terms of the GNU Lesser General Public
8  * License as published by the Free Software Foundation; either
9  * version 2.1 of the License, or (at your option) any later version.
10  *
11  * FFmpeg is distributed in the hope that it will be useful,
12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14  * Lesser General Public License for more details.
15  *
16  * You should have received a copy of the GNU Lesser General Public
17  * License along with FFmpeg; if not, write to the Free Software
18  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19  */
20 
21 #ifndef AVCODEC_AVCODEC_H
22 #define AVCODEC_AVCODEC_H
23 
24 /**
25  * @file
26  * @ingroup libavc
27  * Libavcodec external API header
28  */
29 
30 #include <errno.h>
31 #include "libavutil/samplefmt.h"
32 #include "libavutil/attributes.h"
33 #include "libavutil/avutil.h"
34 #include "libavutil/buffer.h"
35 #include "libavutil/cpu.h"
37 #include "libavutil/dict.h"
38 #include "libavutil/frame.h"
39 #include "libavutil/log.h"
40 #include "libavutil/pixfmt.h"
41 #include "libavutil/rational.h"
42 
43 #include "version.h"
44 
45 /**
46  * @defgroup libavc Encoding/Decoding Library
47  * @{
48  *
49  * @defgroup lavc_decoding Decoding
50  * @{
51  * @}
52  *
53  * @defgroup lavc_encoding Encoding
54  * @{
55  * @}
56  *
57  * @defgroup lavc_codec Codecs
58  * @{
59  * @defgroup lavc_codec_native Native Codecs
60  * @{
61  * @}
62  * @defgroup lavc_codec_wrappers External library wrappers
63  * @{
64  * @}
65  * @defgroup lavc_codec_hwaccel Hardware Accelerators bridge
66  * @{
67  * @}
68  * @}
69  * @defgroup lavc_internal Internal
70  * @{
71  * @}
72  * @}
73  *
74  */
75 
76 /**
77  * @defgroup lavc_core Core functions/structures.
78  * @ingroup libavc
79  *
80  * Basic definitions, functions for querying libavcodec capabilities,
81  * allocating core structures, etc.
82  * @{
83  */
84 
85 
86 /**
87  * Identify the syntax and semantics of the bitstream.
88  * The principle is roughly:
89  * Two decoders with the same ID can decode the same streams.
90  * Two encoders with the same ID can encode compatible streams.
91  * There may be slight deviations from the principle due to implementation
92  * details.
93  *
94  * If you add a codec ID to this list, add it so that
95  * 1. no value of a existing codec ID changes (that would break ABI),
96  * 2. Give it a value which when taken as ASCII is recognized uniquely by a human as this specific codec.
97  * This ensures that 2 forks can independently add AVCodecIDs without producing conflicts.
98  *
99  * After adding new codec IDs, do not forget to add an entry to the codec
100  * descriptor list and bump libavcodec minor version.
101  */
102 enum AVCodecID {
104 
105  /* video codecs */
107  AV_CODEC_ID_MPEG2VIDEO, ///< preferred ID for MPEG-1/2 video decoding
108 #if FF_API_XVMC
109  AV_CODEC_ID_MPEG2VIDEO_XVMC,
110 #endif /* FF_API_XVMC */
296 
297  AV_CODEC_ID_BRENDER_PIX= MKBETAG('B','P','I','X'),
298  AV_CODEC_ID_Y41P = MKBETAG('Y','4','1','P'),
299  AV_CODEC_ID_ESCAPE130 = MKBETAG('E','1','3','0'),
300  AV_CODEC_ID_EXR = MKBETAG('0','E','X','R'),
301  AV_CODEC_ID_AVRP = MKBETAG('A','V','R','P'),
302 
303  AV_CODEC_ID_012V = MKBETAG('0','1','2','V'),
304  AV_CODEC_ID_G2M = MKBETAG( 0 ,'G','2','M'),
305  AV_CODEC_ID_AVUI = MKBETAG('A','V','U','I'),
306  AV_CODEC_ID_AYUV = MKBETAG('A','Y','U','V'),
307  AV_CODEC_ID_TARGA_Y216 = MKBETAG('T','2','1','6'),
308  AV_CODEC_ID_V308 = MKBETAG('V','3','0','8'),
309  AV_CODEC_ID_V408 = MKBETAG('V','4','0','8'),
310  AV_CODEC_ID_YUV4 = MKBETAG('Y','U','V','4'),
311  AV_CODEC_ID_SANM = MKBETAG('S','A','N','M'),
312  AV_CODEC_ID_PAF_VIDEO = MKBETAG('P','A','F','V'),
313  AV_CODEC_ID_AVRN = MKBETAG('A','V','R','n'),
314  AV_CODEC_ID_CPIA = MKBETAG('C','P','I','A'),
315  AV_CODEC_ID_XFACE = MKBETAG('X','F','A','C'),
316  AV_CODEC_ID_SGIRLE = MKBETAG('S','G','I','R'),
317  AV_CODEC_ID_MVC1 = MKBETAG('M','V','C','1'),
318  AV_CODEC_ID_MVC2 = MKBETAG('M','V','C','2'),
319  AV_CODEC_ID_SNOW = MKBETAG('S','N','O','W'),
320  AV_CODEC_ID_WEBP = MKBETAG('W','E','B','P'),
321  AV_CODEC_ID_SMVJPEG = MKBETAG('S','M','V','J'),
322  AV_CODEC_ID_HEVC = MKBETAG('H','2','6','5'),
323 #define AV_CODEC_ID_H265 AV_CODEC_ID_HEVC
324  AV_CODEC_ID_VP7 = MKBETAG('V','P','7','0'),
325  AV_CODEC_ID_APNG = MKBETAG('A','P','N','G'),
326 
327  /* various PCM "codecs" */
328  AV_CODEC_ID_FIRST_AUDIO = 0x10000, ///< A dummy id pointing at the start of audio codecs
362 
363  /* various ADPCM codecs */
395  AV_CODEC_ID_ADPCM_VIMA = MKBETAG('V','I','M','A'),
396 #if FF_API_VIMA_DECODER
397  AV_CODEC_ID_VIMA = MKBETAG('V','I','M','A'),
398 #endif
399  AV_CODEC_ID_ADPCM_AFC = MKBETAG('A','F','C',' '),
400  AV_CODEC_ID_ADPCM_IMA_OKI = MKBETAG('O','K','I',' '),
401  AV_CODEC_ID_ADPCM_DTK = MKBETAG('D','T','K',' '),
402  AV_CODEC_ID_ADPCM_IMA_RAD = MKBETAG('R','A','D',' '),
403  AV_CODEC_ID_ADPCM_G726LE = MKBETAG('6','2','7','G'),
404 
405  /* AMR */
408 
409  /* RealAudio codecs*/
412 
413  /* various DPCM codecs */
418 
419  /* audio codecs */
420  AV_CODEC_ID_MP2 = 0x15000,
421  AV_CODEC_ID_MP3, ///< preferred ID for decoding MPEG audio layer 1, 2 or 3
438  AV_CODEC_ID_GSM, ///< as in Berlin toast format
450  AV_CODEC_ID_GSM_MS, /* as found in WAV */
452 #if FF_API_VOXWARE
454 #endif
490  AV_CODEC_ID_FFWAVESYNTH = MKBETAG('F','F','W','S'),
491  AV_CODEC_ID_SONIC = MKBETAG('S','O','N','C'),
492  AV_CODEC_ID_SONIC_LS = MKBETAG('S','O','N','L'),
493  AV_CODEC_ID_PAF_AUDIO = MKBETAG('P','A','F','A'),
494  AV_CODEC_ID_OPUS = MKBETAG('O','P','U','S'),
495  AV_CODEC_ID_TAK = MKBETAG('t','B','a','K'),
496  AV_CODEC_ID_EVRC = MKBETAG('s','e','v','c'),
497  AV_CODEC_ID_SMV = MKBETAG('s','s','m','v'),
498  AV_CODEC_ID_DSD_LSBF = MKBETAG('D','S','D','L'),
499  AV_CODEC_ID_DSD_MSBF = MKBETAG('D','S','D','M'),
502 
503  /* subtitle codecs */
504  AV_CODEC_ID_FIRST_SUBTITLE = 0x17000, ///< A dummy ID pointing at the start of subtitle codecs.
507  AV_CODEC_ID_TEXT, ///< raw UTF-8 text
514  AV_CODEC_ID_MICRODVD = MKBETAG('m','D','V','D'),
515  AV_CODEC_ID_EIA_608 = MKBETAG('c','6','0','8'),
516  AV_CODEC_ID_JACOSUB = MKBETAG('J','S','U','B'),
517  AV_CODEC_ID_SAMI = MKBETAG('S','A','M','I'),
518  AV_CODEC_ID_REALTEXT = MKBETAG('R','T','X','T'),
519  AV_CODEC_ID_STL = MKBETAG('S','p','T','L'),
520  AV_CODEC_ID_SUBVIEWER1 = MKBETAG('S','b','V','1'),
521  AV_CODEC_ID_SUBVIEWER = MKBETAG('S','u','b','V'),
522  AV_CODEC_ID_SUBRIP = MKBETAG('S','R','i','p'),
523  AV_CODEC_ID_WEBVTT = MKBETAG('W','V','T','T'),
524  AV_CODEC_ID_MPL2 = MKBETAG('M','P','L','2'),
525  AV_CODEC_ID_VPLAYER = MKBETAG('V','P','l','r'),
526  AV_CODEC_ID_PJS = MKBETAG('P','h','J','S'),
527  AV_CODEC_ID_ASS = MKBETAG('A','S','S',' '), ///< ASS as defined in Matroska
528 
529  /* other specific kind of codecs (generally used for attachments) */
530  AV_CODEC_ID_FIRST_UNKNOWN = 0x18000, ///< A dummy ID pointing at the start of various fake codecs.
531  AV_CODEC_ID_TTF = 0x18000,
532  AV_CODEC_ID_BINTEXT = MKBETAG('B','T','X','T'),
533  AV_CODEC_ID_XBIN = MKBETAG('X','B','I','N'),
534  AV_CODEC_ID_IDF = MKBETAG( 0 ,'I','D','F'),
535  AV_CODEC_ID_OTF = MKBETAG( 0 ,'O','T','F'),
536  AV_CODEC_ID_SMPTE_KLV = MKBETAG('K','L','V','A'),
537  AV_CODEC_ID_DVD_NAV = MKBETAG('D','N','A','V'),
538  AV_CODEC_ID_TIMED_ID3 = MKBETAG('T','I','D','3'),
539  AV_CODEC_ID_BIN_DATA = MKBETAG('D','A','T','A'),
540 
541 
542  AV_CODEC_ID_PROBE = 0x19000, ///< codec_id is not known (like AV_CODEC_ID_NONE) but lavf should attempt to identify it
543 
544  AV_CODEC_ID_MPEG2TS = 0x20000, /**< _FAKE_ codec to indicate a raw MPEG-2 TS
545  * stream (only used by libavformat) */
546  AV_CODEC_ID_MPEG4SYSTEMS = 0x20001, /**< _FAKE_ codec to indicate a MPEG-4 Systems
547  * stream (only used by libavformat) */
548  AV_CODEC_ID_FFMETADATA = 0x21000, ///< Dummy codec for streams containing only metadata information.
549 
550 #if FF_API_CODEC_ID
551 #include "old_codec_ids.h"
552 #endif
553 };
554 
555 /**
556  * This struct describes the properties of a single codec described by an
557  * AVCodecID.
558  * @see avcodec_descriptor_get()
559  */
560 typedef struct AVCodecDescriptor {
561  enum AVCodecID id;
563  /**
564  * Name of the codec described by this descriptor. It is non-empty and
565  * unique for each codec descriptor. It should contain alphanumeric
566  * characters and '_' only.
567  */
568  const char *name;
569  /**
570  * A more descriptive name for this codec. May be NULL.
571  */
572  const char *long_name;
573  /**
574  * Codec properties, a combination of AV_CODEC_PROP_* flags.
575  */
576  int props;
577 
578  /**
579  * MIME type(s) associated with the codec.
580  * May be NULL; if not, a NULL-terminated array of MIME types.
581  * The first item is always non-NULL and is the preferred MIME type.
582  */
583  const char *const *mime_types;
586 /**
587  * Codec uses only intra compression.
588  * Video codecs only.
589  */
590 #define AV_CODEC_PROP_INTRA_ONLY (1 << 0)
591 /**
592  * Codec supports lossy compression. Audio and video codecs only.
593  * @note a codec may support both lossy and lossless
594  * compression modes
595  */
596 #define AV_CODEC_PROP_LOSSY (1 << 1)
597 /**
598  * Codec supports lossless compression. Audio and video codecs only.
599  */
600 #define AV_CODEC_PROP_LOSSLESS (1 << 2)
601 /**
602  * Codec supports frame reordering. That is, the coded order (the order in which
603  * the encoded packets are output by the encoders / stored / input to the
604  * decoders) may be different from the presentation order of the corresponding
605  * frames.
606  *
607  * For codecs that do not have this property set, PTS and DTS should always be
608  * equal.
609  */
610 #define AV_CODEC_PROP_REORDER (1 << 3)
611 /**
612  * Subtitle codec is bitmap based
613  * Decoded AVSubtitle data can be read from the AVSubtitleRect->pict field.
614  */
615 #define AV_CODEC_PROP_BITMAP_SUB (1 << 16)
616 /**
617  * Subtitle codec is text based.
618  * Decoded AVSubtitle data can be read from the AVSubtitleRect->ass field.
619  */
620 #define AV_CODEC_PROP_TEXT_SUB (1 << 17)
622 /**
623  * @ingroup lavc_decoding
624  * Required number of additionally allocated bytes at the end of the input bitstream for decoding.
625  * This is mainly needed because some optimized bitstream readers read
626  * 32 or 64 bit at once and could read over the end.<br>
627  * Note: If the first 23 bits of the additional bytes are not 0, then damaged
628  * MPEG bitstreams could cause overread and segfault.
629  */
630 #define FF_INPUT_BUFFER_PADDING_SIZE 32
632 /**
633  * @ingroup lavc_encoding
634  * minimum encoding buffer size
635  * Used to avoid some checks during header writing.
636  */
637 #define FF_MIN_BUFFER_SIZE 16384
640 /**
641  * @ingroup lavc_encoding
642  * motion estimation type.
643  */
645  ME_ZERO = 1, ///< no search, that is use 0,0 vector whenever one is needed
649  ME_EPZS, ///< enhanced predictive zonal search
650  ME_X1, ///< reserved for experiments
651  ME_HEX, ///< hexagon based search
652  ME_UMH, ///< uneven multi-hexagon search
653  ME_TESA, ///< transformed exhaustive search algorithm
654  ME_ITER=50, ///< iterative search
655 };
657 /**
658  * @ingroup lavc_decoding
659  */
661  /* We leave some space between them for extensions (drop some
662  * keyframes for intra-only or drop just some bidir frames). */
663  AVDISCARD_NONE =-16, ///< discard nothing
664  AVDISCARD_DEFAULT = 0, ///< discard useless packets like 0 size packets in avi
665  AVDISCARD_NONREF = 8, ///< discard all non reference
666  AVDISCARD_BIDIR = 16, ///< discard all bidirectional frames
667  AVDISCARD_NONINTRA= 24, ///< discard all non intra frames
668  AVDISCARD_NONKEY = 32, ///< discard all frames except keyframes
669  AVDISCARD_ALL = 48, ///< discard all
670 };
682  AV_AUDIO_SERVICE_TYPE_NB , ///< Not part of ABI
683 };
685 /**
686  * @ingroup lavc_encoding
687  */
688 typedef struct RcOverride{
691  int qscale; // If this is 0 then quality_factor will be used instead.
695 #if FF_API_MAX_BFRAMES
696 /**
697  * @deprecated there is no libavcodec-wide limit on the number of B-frames
698  */
699 #define FF_MAX_B_FRAMES 16
700 #endif
702 /* encoding support
703  These flags can be passed in AVCodecContext.flags before initialization.
704  Note: Not everything is supported yet.
705 */
707 /**
708  * Allow decoders to produce frames with data planes that are not aligned
709  * to CPU requirements (e.g. due to cropping).
710  */
711 #define CODEC_FLAG_UNALIGNED 0x0001
712 #define CODEC_FLAG_QSCALE 0x0002 ///< Use fixed qscale.
713 #define CODEC_FLAG_4MV 0x0004 ///< 4 MV per MB allowed / advanced prediction for H.263.
714 #define CODEC_FLAG_OUTPUT_CORRUPT 0x0008 ///< Output even those frames that might be corrupted
715 #define CODEC_FLAG_QPEL 0x0010 ///< Use qpel MC.
716 #if FF_API_GMC
717 /**
718  * @deprecated use the "gmc" private option of the libxvid encoder
719  */
720 #define CODEC_FLAG_GMC 0x0020 ///< Use GMC.
721 #endif
722 #if FF_API_MV0
723 /**
724  * @deprecated use the flag "mv0" in the "mpv_flags" private option of the
725  * mpegvideo encoders
726  */
727 #define CODEC_FLAG_MV0 0x0040
728 #endif
729 #if FF_API_INPUT_PRESERVED
730 /**
731  * @deprecated passing reference-counted frames to the encoders replaces this
732  * flag
733  */
734 #define CODEC_FLAG_INPUT_PRESERVED 0x0100
735 #endif
736 #define CODEC_FLAG_PASS1 0x0200 ///< Use internal 2pass ratecontrol in first pass mode.
737 #define CODEC_FLAG_PASS2 0x0400 ///< Use internal 2pass ratecontrol in second pass mode.
738 #define CODEC_FLAG_GRAY 0x2000 ///< Only decode/encode grayscale.
739 #if FF_API_EMU_EDGE
740 /**
741  * @deprecated edges are not used/required anymore. I.e. this flag is now always
742  * set.
743  */
744 #define CODEC_FLAG_EMU_EDGE 0x4000
745 #endif
746 #define CODEC_FLAG_PSNR 0x8000 ///< error[?] variables will be set during encoding.
747 #define CODEC_FLAG_TRUNCATED 0x00010000 /** Input bitstream might be truncated at a random
748  location instead of only at frame boundaries. */
749 #if FF_API_NORMALIZE_AQP
750 /**
751  * @deprecated use the flag "naq" in the "mpv_flags" private option of the
752  * mpegvideo encoders
753  */
754 #define CODEC_FLAG_NORMALIZE_AQP 0x00020000
755 #endif
756 #define CODEC_FLAG_INTERLACED_DCT 0x00040000 ///< Use interlaced DCT.
757 #define CODEC_FLAG_LOW_DELAY 0x00080000 ///< Force low delay.
758 #define CODEC_FLAG_GLOBAL_HEADER 0x00400000 ///< Place global headers in extradata instead of every keyframe.
759 #define CODEC_FLAG_BITEXACT 0x00800000 ///< Use only bitexact stuff (except (I)DCT).
760 /* Fx : Flag for h263+ extra options */
761 #define CODEC_FLAG_AC_PRED 0x01000000 ///< H.263 advanced intra coding / MPEG-4 AC prediction
762 #define CODEC_FLAG_LOOP_FILTER 0x00000800 ///< loop filter
763 #define CODEC_FLAG_INTERLACED_ME 0x20000000 ///< interlaced motion estimation
764 #define CODEC_FLAG_CLOSED_GOP 0x80000000
765 #define CODEC_FLAG2_FAST 0x00000001 ///< Allow non spec compliant speedup tricks.
766 #define CODEC_FLAG2_NO_OUTPUT 0x00000004 ///< Skip bitstream encoding.
767 #define CODEC_FLAG2_LOCAL_HEADER 0x00000008 ///< Place global headers at every keyframe instead of in extradata.
768 #define CODEC_FLAG2_DROP_FRAME_TIMECODE 0x00002000 ///< timecode is in drop frame format. DEPRECATED!!!!
769 #define CODEC_FLAG2_IGNORE_CROP 0x00010000 ///< Discard cropping information from SPS.
771 #define CODEC_FLAG2_CHUNKS 0x00008000 ///< Input bitstream might be truncated at a packet boundaries instead of only at frame boundaries.
772 #define CODEC_FLAG2_SHOW_ALL 0x00400000 ///< Show all frames before the first keyframe
773 #define CODEC_FLAG2_EXPORT_MVS 0x10000000 ///< Export motion vectors through frame side data
774 #define CODEC_FLAG2_SKIP_MANUAL 0x20000000 ///< Do not skip samples and export skip information as frame side data
776 /* Unsupported options :
777  * Syntax Arithmetic coding (SAC)
778  * Reference Picture Selection
779  * Independent Segment Decoding */
780 /* /Fx */
781 /* codec capabilities */
783 #define CODEC_CAP_DRAW_HORIZ_BAND 0x0001 ///< Decoder can use draw_horiz_band callback.
784 /**
785  * Codec uses get_buffer() for allocating buffers and supports custom allocators.
786  * If not set, it might not use get_buffer() at all or use operations that
787  * assume the buffer was allocated by avcodec_default_get_buffer.
788  */
789 #define CODEC_CAP_DR1 0x0002
790 #define CODEC_CAP_TRUNCATED 0x0008
791 #if FF_API_XVMC
792 /* Codec can export data for HW decoding. This flag indicates that
793  * the codec would call get_format() with list that might contain HW accelerated
794  * pixel formats (XvMC, VDPAU, VAAPI, etc). The application can pick any of them
795  * including raw image format.
796  * The application can use the passed context to determine bitstream version,
797  * chroma format, resolution etc.
798  */
799 #define CODEC_CAP_HWACCEL 0x0010
800 #endif /* FF_API_XVMC */
801 /**
802  * Encoder or decoder requires flushing with NULL input at the end in order to
803  * give the complete and correct output.
804  *
805  * NOTE: If this flag is not set, the codec is guaranteed to never be fed with
806  * with NULL data. The user can still send NULL data to the public encode
807  * or decode function, but libavcodec will not pass it along to the codec
808  * unless this flag is set.
809  *
810  * Decoders:
811  * The decoder has a non-zero delay and needs to be fed with avpkt->data=NULL,
812  * avpkt->size=0 at the end to get the delayed data until the decoder no longer
813  * returns frames.
814  *
815  * Encoders:
816  * The encoder needs to be fed with NULL data at the end of encoding until the
817  * encoder no longer returns data.
818  *
819  * NOTE: For encoders implementing the AVCodec.encode2() function, setting this
820  * flag also means that the encoder must set the pts and duration for
821  * each output packet. If this flag is not set, the pts and duration will
822  * be determined by libavcodec from the input frame.
823  */
824 #define CODEC_CAP_DELAY 0x0020
825 /**
826  * Codec can be fed a final frame with a smaller size.
827  * This can be used to prevent truncation of the last audio samples.
828  */
829 #define CODEC_CAP_SMALL_LAST_FRAME 0x0040
830 #if FF_API_CAP_VDPAU
831 /**
832  * Codec can export data for HW decoding (VDPAU).
833  */
834 #define CODEC_CAP_HWACCEL_VDPAU 0x0080
835 #endif
836 /**
837  * Codec can output multiple frames per AVPacket
838  * Normally demuxers return one frame at a time, demuxers which do not do
839  * are connected to a parser to split what they return into proper frames.
840  * This flag is reserved to the very rare category of codecs which have a
841  * bitstream that cannot be split into frames without timeconsuming
842  * operations like full decoding. Demuxers carring such bitstreams thus
843  * may return multiple frames in a packet. This has many disadvantages like
844  * prohibiting stream copy in many cases thus it should only be considered
845  * as a last resort.
846  */
847 #define CODEC_CAP_SUBFRAMES 0x0100
848 /**
849  * Codec is experimental and is thus avoided in favor of non experimental
850  * encoders
851  */
852 #define CODEC_CAP_EXPERIMENTAL 0x0200
853 /**
854  * Codec should fill in channel configuration and samplerate instead of container
855  */
856 #define CODEC_CAP_CHANNEL_CONF 0x0400
857 #if FF_API_NEG_LINESIZES
858 /**
859  * @deprecated no codecs use this capability
860  */
861 #define CODEC_CAP_NEG_LINESIZES 0x0800
862 #endif
863 /**
864  * Codec supports frame-level multithreading.
865  */
866 #define CODEC_CAP_FRAME_THREADS 0x1000
867 /**
868  * Codec supports slice-based (or partition-based) multithreading.
869  */
870 #define CODEC_CAP_SLICE_THREADS 0x2000
871 /**
872  * Codec supports changed parameters at any point.
873  */
874 #define CODEC_CAP_PARAM_CHANGE 0x4000
875 /**
876  * Codec supports avctx->thread_count == 0 (auto).
877  */
878 #define CODEC_CAP_AUTO_THREADS 0x8000
879 /**
880  * Audio encoder supports receiving a different number of samples in each call.
881  */
882 #define CODEC_CAP_VARIABLE_FRAME_SIZE 0x10000
883 /**
884  * Codec is intra only.
885  */
886 #define CODEC_CAP_INTRA_ONLY 0x40000000
887 /**
888  * Codec is lossless.
889  */
890 #define CODEC_CAP_LOSSLESS 0x80000000
892 #if FF_API_MB_TYPE
893 //The following defines may change, don't expect compatibility if you use them.
894 #define MB_TYPE_INTRA4x4 0x0001
895 #define MB_TYPE_INTRA16x16 0x0002 //FIXME H.264-specific
896 #define MB_TYPE_INTRA_PCM 0x0004 //FIXME H.264-specific
897 #define MB_TYPE_16x16 0x0008
898 #define MB_TYPE_16x8 0x0010
899 #define MB_TYPE_8x16 0x0020
900 #define MB_TYPE_8x8 0x0040
901 #define MB_TYPE_INTERLACED 0x0080
902 #define MB_TYPE_DIRECT2 0x0100 //FIXME
903 #define MB_TYPE_ACPRED 0x0200
904 #define MB_TYPE_GMC 0x0400
905 #define MB_TYPE_SKIP 0x0800
906 #define MB_TYPE_P0L0 0x1000
907 #define MB_TYPE_P1L0 0x2000
908 #define MB_TYPE_P0L1 0x4000
909 #define MB_TYPE_P1L1 0x8000
910 #define MB_TYPE_L0 (MB_TYPE_P0L0 | MB_TYPE_P1L0)
911 #define MB_TYPE_L1 (MB_TYPE_P0L1 | MB_TYPE_P1L1)
912 #define MB_TYPE_L0L1 (MB_TYPE_L0 | MB_TYPE_L1)
913 #define MB_TYPE_QUANT 0x00010000
914 #define MB_TYPE_CBP 0x00020000
915 //Note bits 24-31 are reserved for codec specific use (h264 ref0, mpeg1 0mv, ...)
916 #endif
918 /**
919  * Pan Scan area.
920  * This specifies the area which should be displayed.
921  * Note there may be multiple such areas for one frame.
922  */
923 typedef struct AVPanScan{
924  /**
925  * id
926  * - encoding: Set by user.
927  * - decoding: Set by libavcodec.
928  */
929  int id;
931  /**
932  * width and height in 1/16 pel
933  * - encoding: Set by user.
934  * - decoding: Set by libavcodec.
935  */
936  int width;
937  int height;
939  /**
940  * position of the top left corner in 1/16 pel for up to 3 fields/frames
941  * - encoding: Set by user.
942  * - decoding: Set by libavcodec.
943  */
944  int16_t position[3][2];
945 }AVPanScan;
947 #if FF_API_QSCALE_TYPE
948 #define FF_QSCALE_TYPE_MPEG1 0
949 #define FF_QSCALE_TYPE_MPEG2 1
950 #define FF_QSCALE_TYPE_H264 2
951 #define FF_QSCALE_TYPE_VP56 3
952 #endif
953 
954 #if FF_API_GET_BUFFER
955 #define FF_BUFFER_TYPE_INTERNAL 1
956 #define FF_BUFFER_TYPE_USER 2 ///< direct rendering buffers (image is (de)allocated by user)
957 #define FF_BUFFER_TYPE_SHARED 4 ///< Buffer from somewhere else; don't deallocate image (data/base), all other tables are not shared.
958 #define FF_BUFFER_TYPE_COPY 8 ///< Just a (modified) copy of some other buffer, don't deallocate anything.
959 
960 #define FF_BUFFER_HINTS_VALID 0x01 // Buffer hints value is meaningful (if 0 ignore).
961 #define FF_BUFFER_HINTS_READABLE 0x02 // Codec will read from buffer.
962 #define FF_BUFFER_HINTS_PRESERVE 0x04 // User must not alter buffer content.
963 #define FF_BUFFER_HINTS_REUSABLE 0x08 // Codec will reuse the buffer (update).
964 #endif
965 
966 /**
967  * The decoder will keep a reference to the frame and may reuse it later.
968  */
969 #define AV_GET_BUFFER_FLAG_REF (1 << 0)
970 
971 /**
972  * @defgroup lavc_packet AVPacket
973  *
974  * Types and functions for working with AVPacket.
975  * @{
976  */
980 
981  /**
982  * An AV_PKT_DATA_PARAM_CHANGE side data packet is laid out as follows:
983  * @code
984  * u32le param_flags
985  * if (param_flags & AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_COUNT)
986  * s32le channel_count
987  * if (param_flags & AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_LAYOUT)
988  * u64le channel_layout
989  * if (param_flags & AV_SIDE_DATA_PARAM_CHANGE_SAMPLE_RATE)
990  * s32le sample_rate
991  * if (param_flags & AV_SIDE_DATA_PARAM_CHANGE_DIMENSIONS)
992  * s32le width
993  * s32le height
994  * @endcode
995  */
997 
998  /**
999  * An AV_PKT_DATA_H263_MB_INFO side data packet contains a number of
1000  * structures with info about macroblocks relevant to splitting the
1001  * packet into smaller packets on macroblock edges (e.g. as for RFC 2190).
1002  * That is, it does not necessarily contain info about all macroblocks,
1003  * as long as the distance between macroblocks in the info is smaller
1004  * than the target payload size.
1005  * Each MB info structure is 12 bytes, and is laid out as follows:
1006  * @code
1007  * u32le bit offset from the start of the packet
1008  * u8 current quantizer at the start of the macroblock
1009  * u8 GOB number
1010  * u16le macroblock address within the GOB
1011  * u8 horizontal MV predictor
1012  * u8 vertical MV predictor
1013  * u8 horizontal MV predictor for block number 3
1014  * u8 vertical MV predictor for block number 3
1015  * @endcode
1016  */
1018 
1019  /**
1020  * This side data should be associated with an audio stream and contains
1021  * ReplayGain information in form of the AVReplayGain struct.
1022  */
1024 
1025  /**
1026  * This side data contains a 3x3 transformation matrix describing an affine
1027  * transformation that needs to be applied to the decoded video frames for
1028  * correct presentation.
1029  *
1030  * See libavutil/display.h for a detailed description of the data.
1031  */
1033 
1034  /**
1035  * This side data should be associated with a video stream and contains
1036  * Stereoscopic 3D information in form of the AVStereo3D struct.
1037  */
1039 
1040  /**
1041  * This side data should be associated with an audio stream and corresponds
1042  * to enum AVAudioServiceType.
1043  */
1045 
1046  /**
1047  * Recommmends skipping the specified number of samples
1048  * @code
1049  * u32le number of samples to skip from start of this packet
1050  * u32le number of samples to skip from end of this packet
1051  * u8 reason for start skip
1052  * u8 reason for end skip (0=padding silence, 1=convergence)
1053  * @endcode
1054  */
1056 
1057  /**
1058  * An AV_PKT_DATA_JP_DUALMONO side data packet indicates that
1059  * the packet may contain "dual mono" audio specific to Japanese DTV
1060  * and if it is true, recommends only the selected channel to be used.
1061  * @code
1062  * u8 selected channels (0=mail/left, 1=sub/right, 2=both)
1063  * @endcode
1064  */
1066 
1067  /**
1068  * A list of zero terminated key/value strings. There is no end marker for
1069  * the list, so it is required to rely on the side data size to stop.
1070  */
1072 
1073  /**
1074  * Subtitle event position
1075  * @code
1076  * u32le x1
1077  * u32le y1
1078  * u32le x2
1079  * u32le y2
1080  * @endcode
1081  */
1083 
1084  /**
1085  * Data found in BlockAdditional element of matroska container. There is
1086  * no end marker for the data, so it is required to rely on the side data
1087  * size to recognize the end. 8 byte id (as found in BlockAddId) followed
1088  * by data.
1089  */
1091 
1092  /**
1093  * The optional first identifier line of a WebVTT cue.
1094  */
1096 
1097  /**
1098  * The optional settings (rendering instructions) that immediately
1099  * follow the timestamp specifier of a WebVTT cue.
1100  */
1102 
1103  /**
1104  * A list of zero terminated key/value strings. There is no end marker for
1105  * the list, so it is required to rely on the side data size to stop. This
1106  * side data includes updated metadata which appeared in the stream.
1107  */
1109 };
1110 
1111 typedef struct AVPacketSideData {
1113  int size;
1116 
1117 /**
1118  * This structure stores compressed data. It is typically exported by demuxers
1119  * and then passed as input to decoders, or received as output from encoders and
1120  * then passed to muxers.
1121  *
1122  * For video, it should typically contain one compressed frame. For audio it may
1123  * contain several compressed frames.
1124  *
1125  * AVPacket is one of the few structs in FFmpeg, whose size is a part of public
1126  * ABI. Thus it may be allocated on stack and no new fields can be added to it
1127  * without libavcodec and libavformat major bump.
1128  *
1129  * The semantics of data ownership depends on the buf or destruct (deprecated)
1130  * fields. If either is set, the packet data is dynamically allocated and is
1131  * valid indefinitely until av_free_packet() is called (which in turn calls
1132  * av_buffer_unref()/the destruct callback to free the data). If neither is set,
1133  * the packet data is typically backed by some static buffer somewhere and is
1134  * only valid for a limited time (e.g. until the next read call when demuxing).
1135  *
1136  * The side data is always allocated with av_malloc() and is freed in
1137  * av_free_packet().
1138  */
1139 typedef struct AVPacket {
1140  /**
1141  * A reference to the reference-counted buffer where the packet data is
1142  * stored.
1143  * May be NULL, then the packet data is not reference-counted.
1144  */
1146  /**
1147  * Presentation timestamp in AVStream->time_base units; the time at which
1148  * the decompressed packet will be presented to the user.
1149  * Can be AV_NOPTS_VALUE if it is not stored in the file.
1150  * pts MUST be larger or equal to dts as presentation cannot happen before
1151  * decompression, unless one wants to view hex dumps. Some formats misuse
1152  * the terms dts and pts/cts to mean something different. Such timestamps
1153  * must be converted to true pts/dts before they are stored in AVPacket.
1154  */
1155  int64_t pts;
1156  /**
1157  * Decompression timestamp in AVStream->time_base units; the time at which
1158  * the packet is decompressed.
1159  * Can be AV_NOPTS_VALUE if it is not stored in the file.
1160  */
1161  int64_t dts;
1163  int size;
1165  /**
1166  * A combination of AV_PKT_FLAG values
1167  */
1168  int flags;
1169  /**
1170  * Additional packet data that can be provided by the container.
1171  * Packet can contain several types of side information.
1172  */
1175 
1176  /**
1177  * Duration of this packet in AVStream->time_base units, 0 if unknown.
1178  * Equals next_pts - this_pts in presentation order.
1179  */
1181 #if FF_API_DESTRUCT_PACKET
1183  void (*destruct)(struct AVPacket *);
1185  void *priv;
1186 #endif
1187  int64_t pos; ///< byte position in stream, -1 if unknown
1188 
1189  /**
1190  * Time difference in AVStream->time_base units from the pts of this
1191  * packet to the point at which the output from the decoder has converged
1192  * independent from the availability of previous frames. That is, the
1193  * frames are virtually identical no matter if decoding started from
1194  * the very first frame or from this keyframe.
1195  * Is AV_NOPTS_VALUE if unknown.
1196  * This field is not the display duration of the current packet.
1197  * This field has no meaning if the packet does not have AV_PKT_FLAG_KEY
1198  * set.
1199  *
1200  * The purpose of this field is to allow seeking in streams that have no
1201  * keyframes in the conventional sense. It corresponds to the
1202  * recovery point SEI in H.264 and match_time_delta in NUT. It is also
1203  * essential for some types of subtitle streams to ensure that all
1204  * subtitles are correctly displayed after seeking.
1205  */
1207 } AVPacket;
1208 #define AV_PKT_FLAG_KEY 0x0001 ///< The packet contains a keyframe
1209 #define AV_PKT_FLAG_CORRUPT 0x0002 ///< The packet content is corrupted
1210 
1216 };
1217 /**
1218  * @}
1219  */
1220 
1221 struct AVCodecInternal;
1222 
1226  AV_FIELD_TT, //< Top coded_first, top displayed first
1227  AV_FIELD_BB, //< Bottom coded first, bottom displayed first
1228  AV_FIELD_TB, //< Top coded first, bottom displayed first
1229  AV_FIELD_BT, //< Bottom coded first, top displayed first
1230 };
1231 
1232 /**
1233  * main external API structure.
1234  * New fields can be added to the end with minor version bumps.
1235  * Removal, reordering and changes to existing fields require a major
1236  * version bump.
1237  * Please use AVOptions (av_opt* / av_set/get*()) to access these fields from user
1238  * applications.
1239  * sizeof(AVCodecContext) must not be used outside libav*.
1240  */
1241 typedef struct AVCodecContext {
1242  /**
1243  * information on struct for av_log
1244  * - set by avcodec_alloc_context3
1245  */
1248 
1249  enum AVMediaType codec_type; /* see AVMEDIA_TYPE_xxx */
1250  const struct AVCodec *codec;
1251 #if FF_API_CODEC_NAME
1252  /**
1253  * @deprecated this field is not used for anything in libavcodec
1254  */
1256  char codec_name[32];
1257 #endif
1258  enum AVCodecID codec_id; /* see AV_CODEC_ID_xxx */
1259 
1260  /**
1261  * fourcc (LSB first, so "ABCD" -> ('D'<<24) + ('C'<<16) + ('B'<<8) + 'A').
1262  * This is used to work around some encoder bugs.
1263  * A demuxer should set this to what is stored in the field used to identify the codec.
1264  * If there are multiple such fields in a container then the demuxer should choose the one
1265  * which maximizes the information about the used codec.
1266  * If the codec tag field in a container is larger than 32 bits then the demuxer should
1267  * remap the longer ID to 32 bits with a table or other structure. Alternatively a new
1268  * extra_codec_tag + size could be added but for this a clear advantage must be demonstrated
1269  * first.
1270  * - encoding: Set by user, if not then the default based on codec_id will be used.
1271  * - decoding: Set by user, will be converted to uppercase by libavcodec during init.
1272  */
1273  unsigned int codec_tag;
1274 
1275 #if FF_API_STREAM_CODEC_TAG
1276  /**
1277  * @deprecated this field is unused
1278  */
1280  unsigned int stream_codec_tag;
1281 #endif
1282 
1283  void *priv_data;
1284 
1285  /**
1286  * Private context used for internal data.
1287  *
1288  * Unlike priv_data, this is not codec-specific. It is used in general
1289  * libavcodec functions.
1290  */
1291  struct AVCodecInternal *internal;
1292 
1293  /**
1294  * Private data of the user, can be used to carry app specific stuff.
1295  * - encoding: Set by user.
1296  * - decoding: Set by user.
1297  */
1298  void *opaque;
1299 
1300  /**
1301  * the average bitrate
1302  * - encoding: Set by user; unused for constant quantizer encoding.
1303  * - decoding: Set by libavcodec. 0 or some bitrate if this info is available in the stream.
1304  */
1306 
1307  /**
1308  * number of bits the bitstream is allowed to diverge from the reference.
1309  * the reference can be CBR (for CBR pass1) or VBR (for pass2)
1310  * - encoding: Set by user; unused for constant quantizer encoding.
1311  * - decoding: unused
1312  */
1314 
1315  /**
1316  * Global quality for codecs which cannot change it per frame.
1317  * This should be proportional to MPEG-1/2/4 qscale.
1318  * - encoding: Set by user.
1319  * - decoding: unused
1320  */
1322 
1323  /**
1324  * - encoding: Set by user.
1325  * - decoding: unused
1326  */
1328 #define FF_COMPRESSION_DEFAULT -1
1329 
1330  /**
1331  * CODEC_FLAG_*.
1332  * - encoding: Set by user.
1333  * - decoding: Set by user.
1334  */
1335  int flags;
1336 
1337  /**
1338  * CODEC_FLAG2_*
1339  * - encoding: Set by user.
1340  * - decoding: Set by user.
1341  */
1342  int flags2;
1343 
1344  /**
1345  * some codecs need / can use extradata like Huffman tables.
1346  * mjpeg: Huffman tables
1347  * rv10: additional flags
1348  * mpeg4: global headers (they can be in the bitstream or here)
1349  * The allocated memory should be FF_INPUT_BUFFER_PADDING_SIZE bytes larger
1350  * than extradata_size to avoid problems if it is read with the bitstream reader.
1351  * The bytewise contents of extradata must not depend on the architecture or CPU endianness.
1352  * - encoding: Set/allocated/freed by libavcodec.
1353  * - decoding: Set/allocated/freed by user.
1354  */
1357 
1358  /**
1359  * This is the fundamental unit of time (in seconds) in terms
1360  * of which frame timestamps are represented. For fixed-fps content,
1361  * timebase should be 1/framerate and timestamp increments should be
1362  * identically 1.
1363  * This often, but not always is the inverse of the frame rate or field rate
1364  * for video.
1365  * - encoding: MUST be set by user.
1366  * - decoding: the use of this field for decoding is deprecated.
1367  * Use framerate instead.
1368  */
1370 
1371  /**
1372  * For some codecs, the time base is closer to the field rate than the frame rate.
1373  * Most notably, H.264 and MPEG-2 specify time_base as half of frame duration
1374  * if no telecine is used ...
1375  *
1376  * Set to time_base ticks per frame. Default 1, e.g., H.264/MPEG-2 set it to 2.
1377  */
1379 
1380  /**
1381  * Codec delay.
1382  *
1383  * Encoding: Number of frames delay there will be from the encoder input to
1384  * the decoder output. (we assume the decoder matches the spec)
1385  * Decoding: Number of frames delay in addition to what a standard decoder
1386  * as specified in the spec would produce.
1387  *
1388  * Video:
1389  * Number of frames the decoded output will be delayed relative to the
1390  * encoded input.
1391  *
1392  * Audio:
1393  * For encoding, this field is unused (see initial_padding).
1394  *
1395  * For decoding, this is the number of samples the decoder needs to
1396  * output before the decoder's output is valid. When seeking, you should
1397  * start decoding this many samples prior to your desired seek point.
1398  *
1399  * - encoding: Set by libavcodec.
1400  * - decoding: Set by libavcodec.
1401  */
1402  int delay;
1403 
1404 
1405  /* video only */
1406  /**
1407  * picture width / height.
1408  * - encoding: MUST be set by user.
1409  * - decoding: May be set by the user before opening the decoder if known e.g.
1410  * from the container. Some decoders will require the dimensions
1411  * to be set by the caller. During decoding, the decoder may
1412  * overwrite those values as required.
1413  */
1415 
1416  /**
1417  * Bitstream width / height, may be different from width/height e.g. when
1418  * the decoded frame is cropped before being output or lowres is enabled.
1419  * - encoding: unused
1420  * - decoding: May be set by the user before opening the decoder if known
1421  * e.g. from the container. During decoding, the decoder may
1422  * overwrite those values as required.
1423  */
1425 
1426 #if FF_API_ASPECT_EXTENDED
1427 #define FF_ASPECT_EXTENDED 15
1428 #endif
1429 
1430  /**
1431  * the number of pictures in a group of pictures, or 0 for intra_only
1432  * - encoding: Set by user.
1433  * - decoding: unused
1434  */
1436 
1437  /**
1438  * Pixel format, see AV_PIX_FMT_xxx.
1439  * May be set by the demuxer if known from headers.
1440  * May be overridden by the decoder if it knows better.
1441  * - encoding: Set by user.
1442  * - decoding: Set by user if known, overridden by libavcodec if known
1443  */
1445 
1446  /**
1447  * Motion estimation algorithm used for video coding.
1448  * 1 (zero), 2 (full), 3 (log), 4 (phods), 5 (epzs), 6 (x1), 7 (hex),
1449  * 8 (umh), 9 (iter), 10 (tesa) [7, 8, 10 are x264 specific, 9 is snow specific]
1450  * - encoding: MUST be set by user.
1451  * - decoding: unused
1452  */
1454 
1455  /**
1456  * If non NULL, 'draw_horiz_band' is called by the libavcodec
1457  * decoder to draw a horizontal band. It improves cache usage. Not
1458  * all codecs can do that. You must check the codec capabilities
1459  * beforehand.
1460  * When multithreading is used, it may be called from multiple threads
1461  * at the same time; threads might draw different parts of the same AVFrame,
1462  * or multiple AVFrames, and there is no guarantee that slices will be drawn
1463  * in order.
1464  * The function is also used by hardware acceleration APIs.
1465  * It is called at least once during frame decoding to pass
1466  * the data needed for hardware render.
1467  * In that mode instead of pixel data, AVFrame points to
1468  * a structure specific to the acceleration API. The application
1469  * reads the structure and can change some fields to indicate progress
1470  * or mark state.
1471  * - encoding: unused
1472  * - decoding: Set by user.
1473  * @param height the height of the slice
1474  * @param y the y position of the slice
1475  * @param type 1->top field, 2->bottom field, 3->frame
1476  * @param offset offset into the AVFrame.data from which the slice should be read
1477  */
1479  const AVFrame *src, int offset[AV_NUM_DATA_POINTERS],
1480  int y, int type, int height);
1481 
1482  /**
1483  * callback to negotiate the pixelFormat
1484  * @param fmt is the list of formats which are supported by the codec,
1485  * it is terminated by -1 as 0 is a valid format, the formats are ordered by quality.
1486  * The first is always the native one.
1487  * @note The callback may be called again immediately if initialization for
1488  * the selected (hardware-accelerated) pixel format failed.
1489  * @warning Behavior is undefined if the callback returns a value not
1490  * in the fmt list of formats.
1491  * @return the chosen format
1492  * - encoding: unused
1493  * - decoding: Set by user, if not set the native format will be chosen.
1494  */
1495  enum AVPixelFormat (*get_format)(struct AVCodecContext *s, const enum AVPixelFormat * fmt);
1496 
1497  /**
1498  * maximum number of B-frames between non-B-frames
1499  * Note: The output will be delayed by max_b_frames+1 relative to the input.
1500  * - encoding: Set by user.
1501  * - decoding: unused
1502  */
1504 
1505  /**
1506  * qscale factor between IP and B-frames
1507  * If > 0 then the last P-frame quantizer will be used (q= lastp_q*factor+offset).
1508  * If < 0 then normal ratecontrol will be done (q= -normal_q*factor+offset).
1509  * - encoding: Set by user.
1510  * - decoding: unused
1511  */
1513 
1514  /** obsolete FIXME remove */
1516 #define FF_RC_STRATEGY_XVID 1
1517 
1519 
1520  /**
1521  * qscale offset between IP and B-frames
1522  * - encoding: Set by user.
1523  * - decoding: unused
1524  */
1526 
1527  /**
1528  * Size of the frame reordering buffer in the decoder.
1529  * For MPEG-2 it is 1 IPB or 0 low delay IP.
1530  * - encoding: Set by libavcodec.
1531  * - decoding: Set by libavcodec.
1532  */
1534 
1535  /**
1536  * 0-> h263 quant 1-> mpeg quant
1537  * - encoding: Set by user.
1538  * - decoding: unused
1539  */
1541 
1542  /**
1543  * qscale factor between P and I-frames
1544  * If > 0 then the last p frame quantizer will be used (q= lastp_q*factor+offset).
1545  * If < 0 then normal ratecontrol will be done (q= -normal_q*factor+offset).
1546  * - encoding: Set by user.
1547  * - decoding: unused
1548  */
1550 
1551  /**
1552  * qscale offset between P and I-frames
1553  * - encoding: Set by user.
1554  * - decoding: unused
1555  */
1557 
1558  /**
1559  * luminance masking (0-> disabled)
1560  * - encoding: Set by user.
1561  * - decoding: unused
1562  */
1564 
1565  /**
1566  * temporary complexity masking (0-> disabled)
1567  * - encoding: Set by user.
1568  * - decoding: unused
1569  */
1571 
1572  /**
1573  * spatial complexity masking (0-> disabled)
1574  * - encoding: Set by user.
1575  * - decoding: unused
1576  */
1578 
1579  /**
1580  * p block masking (0-> disabled)
1581  * - encoding: Set by user.
1582  * - decoding: unused
1583  */
1584  float p_masking;
1585 
1586  /**
1587  * darkness masking (0-> disabled)
1588  * - encoding: Set by user.
1589  * - decoding: unused
1590  */
1592 
1593  /**
1594  * slice count
1595  * - encoding: Set by libavcodec.
1596  * - decoding: Set by user (or 0).
1597  */
1599  /**
1600  * prediction method (needed for huffyuv)
1601  * - encoding: Set by user.
1602  * - decoding: unused
1603  */
1605 #define FF_PRED_LEFT 0
1606 #define FF_PRED_PLANE 1
1607 #define FF_PRED_MEDIAN 2
1608 
1609  /**
1610  * slice offsets in the frame in bytes
1611  * - encoding: Set/allocated by libavcodec.
1612  * - decoding: Set/allocated by user (or NULL).
1613  */
1615 
1616  /**
1617  * sample aspect ratio (0 if unknown)
1618  * That is the width of a pixel divided by the height of the pixel.
1619  * Numerator and denominator must be relatively prime and smaller than 256 for some video standards.
1620  * - encoding: Set by user.
1621  * - decoding: Set by libavcodec.
1622  */
1624 
1625  /**
1626  * motion estimation comparison function
1627  * - encoding: Set by user.
1628  * - decoding: unused
1629  */
1630  int me_cmp;
1631  /**
1632  * subpixel motion estimation comparison function
1633  * - encoding: Set by user.
1634  * - decoding: unused
1635  */
1637  /**
1638  * macroblock comparison function (not supported yet)
1639  * - encoding: Set by user.
1640  * - decoding: unused
1641  */
1642  int mb_cmp;
1643  /**
1644  * interlaced DCT comparison function
1645  * - encoding: Set by user.
1646  * - decoding: unused
1647  */
1649 #define FF_CMP_SAD 0
1650 #define FF_CMP_SSE 1
1651 #define FF_CMP_SATD 2
1652 #define FF_CMP_DCT 3
1653 #define FF_CMP_PSNR 4
1654 #define FF_CMP_BIT 5
1655 #define FF_CMP_RD 6
1656 #define FF_CMP_ZERO 7
1657 #define FF_CMP_VSAD 8
1658 #define FF_CMP_VSSE 9
1659 #define FF_CMP_NSSE 10
1660 #define FF_CMP_W53 11
1661 #define FF_CMP_W97 12
1662 #define FF_CMP_DCTMAX 13
1663 #define FF_CMP_DCT264 14
1664 #define FF_CMP_CHROMA 256
1665 
1666  /**
1667  * ME diamond size & shape
1668  * - encoding: Set by user.
1669  * - decoding: unused
1670  */
1672 
1673  /**
1674  * amount of previous MV predictors (2a+1 x 2a+1 square)
1675  * - encoding: Set by user.
1676  * - decoding: unused
1677  */
1679 
1680  /**
1681  * prepass for motion estimation
1682  * - encoding: Set by user.
1683  * - decoding: unused
1684  */
1685  int pre_me;
1686 
1687  /**
1688  * motion estimation prepass comparison function
1689  * - encoding: Set by user.
1690  * - decoding: unused
1691  */
1693 
1694  /**
1695  * ME prepass diamond size & shape
1696  * - encoding: Set by user.
1697  * - decoding: unused
1698  */
1700 
1701  /**
1702  * subpel ME quality
1703  * - encoding: Set by user.
1704  * - decoding: unused
1705  */
1707 
1708 #if FF_API_AFD
1709  /**
1710  * DTG active format information (additional aspect ratio
1711  * information only used in DVB MPEG-2 transport streams)
1712  * 0 if not set.
1713  *
1714  * - encoding: unused
1715  * - decoding: Set by decoder.
1716  * @deprecated Deprecated in favor of AVSideData
1717  */
1719 #define FF_DTG_AFD_SAME 8
1720 #define FF_DTG_AFD_4_3 9
1721 #define FF_DTG_AFD_16_9 10
1722 #define FF_DTG_AFD_14_9 11
1723 #define FF_DTG_AFD_4_3_SP_14_9 13
1724 #define FF_DTG_AFD_16_9_SP_14_9 14
1725 #define FF_DTG_AFD_SP_4_3 15
1726 #endif /* FF_API_AFD */
1727 
1728  /**
1729  * maximum motion estimation search range in subpel units
1730  * If 0 then no limit.
1731  *
1732  * - encoding: Set by user.
1733  * - decoding: unused
1734  */
1736 
1737  /**
1738  * intra quantizer bias
1739  * - encoding: Set by user.
1740  * - decoding: unused
1741  */
1743 #define FF_DEFAULT_QUANT_BIAS 999999
1744 
1745  /**
1746  * inter quantizer bias
1747  * - encoding: Set by user.
1748  * - decoding: unused
1749  */
1751 
1752  /**
1753  * slice flags
1754  * - encoding: unused
1755  * - decoding: Set by user.
1756  */
1758 #define SLICE_FLAG_CODED_ORDER 0x0001 ///< draw_horiz_band() is called in coded order instead of display
1759 #define SLICE_FLAG_ALLOW_FIELD 0x0002 ///< allow draw_horiz_band() with field slices (MPEG2 field pics)
1760 #define SLICE_FLAG_ALLOW_PLANE 0x0004 ///< allow draw_horiz_band() with 1 component at a time (SVQ1)
1761 
1762 #if FF_API_XVMC
1763  /**
1764  * XVideo Motion Acceleration
1765  * - encoding: forbidden
1766  * - decoding: set by decoder
1767  * @deprecated XvMC doesn't need it anymore.
1768  */
1769  attribute_deprecated int xvmc_acceleration;
1770 #endif /* FF_API_XVMC */
1771 
1772  /**
1773  * macroblock decision mode
1774  * - encoding: Set by user.
1775  * - decoding: unused
1776  */
1778 #define FF_MB_DECISION_SIMPLE 0 ///< uses mb_cmp
1779 #define FF_MB_DECISION_BITS 1 ///< chooses the one which needs the fewest bits
1780 #define FF_MB_DECISION_RD 2 ///< rate distortion
1781 
1782  /**
1783  * custom intra quantization matrix
1784  * - encoding: Set by user, can be NULL.
1785  * - decoding: Set by libavcodec.
1786  */
1787  uint16_t *intra_matrix;
1788 
1789  /**
1790  * custom inter quantization matrix
1791  * - encoding: Set by user, can be NULL.
1792  * - decoding: Set by libavcodec.
1793  */
1794  uint16_t *inter_matrix;
1795 
1796  /**
1797  * scene change detection threshold
1798  * 0 is default, larger means fewer detected scene changes.
1799  * - encoding: Set by user.
1800  * - decoding: unused
1801  */
1803 
1804  /**
1805  * noise reduction strength
1806  * - encoding: Set by user.
1807  * - decoding: unused
1808  */
1810 
1811 #if FF_API_MPV_OPT
1812  /**
1813  * @deprecated this field is unused
1814  */
1817 
1818  /**
1819  * @deprecated this field is unused
1820  */
1823 #endif
1824 
1825  /**
1826  * precision of the intra DC coefficient - 8
1827  * - encoding: Set by user.
1828  * - decoding: Set by libavcodec
1829  */
1831 
1832  /**
1833  * Number of macroblock rows at the top which are skipped.
1834  * - encoding: unused
1835  * - decoding: Set by user.
1836  */
1838 
1839  /**
1840  * Number of macroblock rows at the bottom which are skipped.
1841  * - encoding: unused
1842  * - decoding: Set by user.
1843  */
1845 
1846 #if FF_API_MPV_OPT
1847  /**
1848  * @deprecated use encoder private options instead
1849  */
1852 #endif
1853 
1854  /**
1855  * minimum MB lagrange multipler
1856  * - encoding: Set by user.
1857  * - decoding: unused
1858  */
1859  int mb_lmin;
1860 
1861  /**
1862  * maximum MB lagrange multipler
1863  * - encoding: Set by user.
1864  * - decoding: unused
1865  */
1866  int mb_lmax;
1867 
1868  /**
1869  *
1870  * - encoding: Set by user.
1871  * - decoding: unused
1872  */
1874 
1875  /**
1876  *
1877  * - encoding: Set by user.
1878  * - decoding: unused
1879  */
1881 
1882  /**
1883  *
1884  * - encoding: Set by user.
1885  * - decoding: unused
1886  */
1888 
1889  /**
1890  * minimum GOP size
1891  * - encoding: Set by user.
1892  * - decoding: unused
1893  */
1895 
1896  /**
1897  * number of reference frames
1898  * - encoding: Set by user.
1899  * - decoding: Set by lavc.
1900  */
1901  int refs;
1902 
1903  /**
1904  * chroma qp offset from luma
1905  * - encoding: Set by user.
1906  * - decoding: unused
1907  */
1909 
1910 #if FF_API_UNUSED_MEMBERS
1911  /**
1912  * Multiplied by qscale for each frame and added to scene_change_score.
1913  * - encoding: Set by user.
1914  * - decoding: unused
1915  */
1917 #endif
1918 
1919  /**
1920  *
1921  * Note: Value depends upon the compare function used for fullpel ME.
1922  * - encoding: Set by user.
1923  * - decoding: unused
1924  */
1926 
1927  /**
1928  * Adjust sensitivity of b_frame_strategy 1.
1929  * - encoding: Set by user.
1930  * - decoding: unused
1931  */
1933 
1934  /**
1935  * Chromaticity coordinates of the source primaries.
1936  * - encoding: Set by user
1937  * - decoding: Set by libavcodec
1938  */
1940 
1941  /**
1942  * Color Transfer Characteristic.
1943  * - encoding: Set by user
1944  * - decoding: Set by libavcodec
1945  */
1947 
1948  /**
1949  * YUV colorspace type.
1950  * - encoding: Set by user
1951  * - decoding: Set by libavcodec
1952  */
1954 
1955  /**
1956  * MPEG vs JPEG YUV range.
1957  * - encoding: Set by user
1958  * - decoding: Set by libavcodec
1959  */
1961 
1962  /**
1963  * This defines the location of chroma samples.
1964  * - encoding: Set by user
1965  * - decoding: Set by libavcodec
1966  */
1968 
1969  /**
1970  * Number of slices.
1971  * Indicates number of picture subdivisions. Used for parallelized
1972  * decoding.
1973  * - encoding: Set by user
1974  * - decoding: unused
1975  */
1976  int slices;
1977 
1978  /** Field order
1979  * - encoding: set by libavcodec
1980  * - decoding: Set by user.
1981  */
1983 
1984  /* audio only */
1985  int sample_rate; ///< samples per second
1986  int channels; ///< number of audio channels
1987 
1988  /**
1989  * audio sample format
1990  * - encoding: Set by user.
1991  * - decoding: Set by libavcodec.
1992  */
1993  enum AVSampleFormat sample_fmt; ///< sample format
1994 
1995  /* The following data should not be initialized. */
1996  /**
1997  * Number of samples per channel in an audio frame.
1998  *
1999  * - encoding: set by libavcodec in avcodec_open2(). Each submitted frame
2000  * except the last must contain exactly frame_size samples per channel.
2001  * May be 0 when the codec has CODEC_CAP_VARIABLE_FRAME_SIZE set, then the
2002  * frame size is not restricted.
2003  * - decoding: may be set by some decoders to indicate constant frame size
2004  */
2006 
2007  /**
2008  * Frame counter, set by libavcodec.
2009  *
2010  * - decoding: total number of frames returned from the decoder so far.
2011  * - encoding: total number of frames passed to the encoder so far.
2012  *
2013  * @note the counter is not incremented if encoding/decoding resulted in
2014  * an error.
2015  */
2017 
2018  /**
2019  * number of bytes per packet if constant and known or 0
2020  * Used by some WAV based audio codecs.
2021  */
2023 
2024  /**
2025  * Audio cutoff bandwidth (0 means "automatic")
2026  * - encoding: Set by user.
2027  * - decoding: unused
2028  */
2029  int cutoff;
2030 
2031 #if FF_API_REQUEST_CHANNELS
2032  /**
2033  * Decoder should decode to this many channels if it can (0 for default)
2034  * - encoding: unused
2035  * - decoding: Set by user.
2036  * @deprecated Deprecated in favor of request_channel_layout.
2037  */
2039 #endif
2040 
2041  /**
2042  * Audio channel layout.
2043  * - encoding: set by user.
2044  * - decoding: set by user, may be overwritten by libavcodec.
2045  */
2046  uint64_t channel_layout;
2047 
2048  /**
2049  * Request decoder to use this channel layout if it can (0 for default)
2050  * - encoding: unused
2051  * - decoding: Set by user.
2052  */
2054 
2055  /**
2056  * Type of service that the audio stream conveys.
2057  * - encoding: Set by user.
2058  * - decoding: Set by libavcodec.
2059  */
2061 
2062  /**
2063  * desired sample format
2064  * - encoding: Not used.
2065  * - decoding: Set by user.
2066  * Decoder will decode to this format if it can.
2067  */
2069 
2070 #if FF_API_GET_BUFFER
2071  /**
2072  * Called at the beginning of each frame to get a buffer for it.
2073  *
2074  * The function will set AVFrame.data[], AVFrame.linesize[].
2075  * AVFrame.extended_data[] must also be set, but it should be the same as
2076  * AVFrame.data[] except for planar audio with more channels than can fit
2077  * in AVFrame.data[]. In that case, AVFrame.data[] shall still contain as
2078  * many data pointers as it can hold.
2079  *
2080  * if CODEC_CAP_DR1 is not set then get_buffer() must call
2081  * avcodec_default_get_buffer() instead of providing buffers allocated by
2082  * some other means.
2083  *
2084  * AVFrame.data[] should be 32- or 16-byte-aligned unless the CPU doesn't
2085  * need it. avcodec_default_get_buffer() aligns the output buffer properly,
2086  * but if get_buffer() is overridden then alignment considerations should
2087  * be taken into account.
2088  *
2089  * @see avcodec_default_get_buffer()
2090  *
2091  * Video:
2092  *
2093  * If pic.reference is set then the frame will be read later by libavcodec.
2094  * avcodec_align_dimensions2() should be used to find the required width and
2095  * height, as they normally need to be rounded up to the next multiple of 16.
2096  *
2097  * If frame multithreading is used and thread_safe_callbacks is set,
2098  * it may be called from a different thread, but not from more than one at
2099  * once. Does not need to be reentrant.
2100  *
2101  * @see release_buffer(), reget_buffer()
2102  * @see avcodec_align_dimensions2()
2103  *
2104  * Audio:
2105  *
2106  * Decoders request a buffer of a particular size by setting
2107  * AVFrame.nb_samples prior to calling get_buffer(). The decoder may,
2108  * however, utilize only part of the buffer by setting AVFrame.nb_samples
2109  * to a smaller value in the output frame.
2110  *
2111  * Decoders cannot use the buffer after returning from
2112  * avcodec_decode_audio4(), so they will not call release_buffer(), as it
2113  * is assumed to be released immediately upon return. In some rare cases,
2114  * a decoder may need to call get_buffer() more than once in a single
2115  * call to avcodec_decode_audio4(). In that case, when get_buffer() is
2116  * called again after it has already been called once, the previously
2117  * acquired buffer is assumed to be released at that time and may not be
2118  * reused by the decoder.
2119  *
2120  * As a convenience, av_samples_get_buffer_size() and
2121  * av_samples_fill_arrays() in libavutil may be used by custom get_buffer()
2122  * functions to find the required data size and to fill data pointers and
2123  * linesize. In AVFrame.linesize, only linesize[0] may be set for audio
2124  * since all planes must be the same size.
2125  *
2126  * @see av_samples_get_buffer_size(), av_samples_fill_arrays()
2127  *
2128  * - encoding: unused
2129  * - decoding: Set by libavcodec, user can override.
2130  *
2131  * @deprecated use get_buffer2()
2132  */
2134  int (*get_buffer)(struct AVCodecContext *c, AVFrame *pic);
2135 
2136  /**
2137  * Called to release buffers which were allocated with get_buffer.
2138  * A released buffer can be reused in get_buffer().
2139  * pic.data[*] must be set to NULL.
2140  * May be called from a different thread if frame multithreading is used,
2141  * but not by more than one thread at once, so does not need to be reentrant.
2142  * - encoding: unused
2143  * - decoding: Set by libavcodec, user can override.
2144  *
2145  * @deprecated custom freeing callbacks should be set from get_buffer2()
2146  */
2149 
2150  /**
2151  * Called at the beginning of a frame to get cr buffer for it.
2152  * Buffer type (size, hints) must be the same. libavcodec won't check it.
2153  * libavcodec will pass previous buffer in pic, function should return
2154  * same buffer or new buffer with old frame "painted" into it.
2155  * If pic.data[0] == NULL must behave like get_buffer().
2156  * if CODEC_CAP_DR1 is not set then reget_buffer() must call
2157  * avcodec_default_reget_buffer() instead of providing buffers allocated by
2158  * some other means.
2159  * - encoding: unused
2160  * - decoding: Set by libavcodec, user can override.
2161  */
2163  int (*reget_buffer)(struct AVCodecContext *c, AVFrame *pic);
2164 #endif
2165 
2166  /**
2167  * This callback is called at the beginning of each frame to get data
2168  * buffer(s) for it. There may be one contiguous buffer for all the data or
2169  * there may be a buffer per each data plane or anything in between. What
2170  * this means is, you may set however many entries in buf[] you feel necessary.
2171  * Each buffer must be reference-counted using the AVBuffer API (see description
2172  * of buf[] below).
2173  *
2174  * The following fields will be set in the frame before this callback is
2175  * called:
2176  * - format
2177  * - width, height (video only)
2178  * - sample_rate, channel_layout, nb_samples (audio only)
2179  * Their values may differ from the corresponding values in
2180  * AVCodecContext. This callback must use the frame values, not the codec
2181  * context values, to calculate the required buffer size.
2182  *
2183  * This callback must fill the following fields in the frame:
2184  * - data[]
2185  * - linesize[]
2186  * - extended_data:
2187  * * if the data is planar audio with more than 8 channels, then this
2188  * callback must allocate and fill extended_data to contain all pointers
2189  * to all data planes. data[] must hold as many pointers as it can.
2190  * extended_data must be allocated with av_malloc() and will be freed in
2191  * av_frame_unref().
2192  * * otherwise exended_data must point to data
2193  * - buf[] must contain one or more pointers to AVBufferRef structures. Each of
2194  * the frame's data and extended_data pointers must be contained in these. That
2195  * is, one AVBufferRef for each allocated chunk of memory, not necessarily one
2196  * AVBufferRef per data[] entry. See: av_buffer_create(), av_buffer_alloc(),
2197  * and av_buffer_ref().
2198  * - extended_buf and nb_extended_buf must be allocated with av_malloc() by
2199  * this callback and filled with the extra buffers if there are more
2200  * buffers than buf[] can hold. extended_buf will be freed in
2201  * av_frame_unref().
2202  *
2203  * If CODEC_CAP_DR1 is not set then get_buffer2() must call
2204  * avcodec_default_get_buffer2() instead of providing buffers allocated by
2205  * some other means.
2206  *
2207  * Each data plane must be aligned to the maximum required by the target
2208  * CPU.
2209  *
2210  * @see avcodec_default_get_buffer2()
2211  *
2212  * Video:
2213  *
2214  * If AV_GET_BUFFER_FLAG_REF is set in flags then the frame may be reused
2215  * (read and/or written to if it is writable) later by libavcodec.
2216  *
2217  * avcodec_align_dimensions2() should be used to find the required width and
2218  * height, as they normally need to be rounded up to the next multiple of 16.
2219  *
2220  * Some decoders do not support linesizes changing between frames.
2221  *
2222  * If frame multithreading is used and thread_safe_callbacks is set,
2223  * this callback may be called from a different thread, but not from more
2224  * than one at once. Does not need to be reentrant.
2225  *
2226  * @see avcodec_align_dimensions2()
2227  *
2228  * Audio:
2229  *
2230  * Decoders request a buffer of a particular size by setting
2231  * AVFrame.nb_samples prior to calling get_buffer2(). The decoder may,
2232  * however, utilize only part of the buffer by setting AVFrame.nb_samples
2233  * to a smaller value in the output frame.
2234  *
2235  * As a convenience, av_samples_get_buffer_size() and
2236  * av_samples_fill_arrays() in libavutil may be used by custom get_buffer2()
2237  * functions to find the required data size and to fill data pointers and
2238  * linesize. In AVFrame.linesize, only linesize[0] may be set for audio
2239  * since all planes must be the same size.
2240  *
2241  * @see av_samples_get_buffer_size(), av_samples_fill_arrays()
2242  *
2243  * - encoding: unused
2244  * - decoding: Set by libavcodec, user can override.
2245  */
2246  int (*get_buffer2)(struct AVCodecContext *s, AVFrame *frame, int flags);
2247 
2248  /**
2249  * If non-zero, the decoded audio and video frames returned from
2250  * avcodec_decode_video2() and avcodec_decode_audio4() are reference-counted
2251  * and are valid indefinitely. The caller must free them with
2252  * av_frame_unref() when they are not needed anymore.
2253  * Otherwise, the decoded frames must not be freed by the caller and are
2254  * only valid until the next decode call.
2255  *
2256  * - encoding: unused
2257  * - decoding: set by the caller before avcodec_open2().
2258  */
2260 
2261  /* - encoding parameters */
2262  float qcompress; ///< amount of qscale change between easy & hard scenes (0.0-1.0)
2263  float qblur; ///< amount of qscale smoothing over time (0.0-1.0)
2264 
2265  /**
2266  * minimum quantizer
2267  * - encoding: Set by user.
2268  * - decoding: unused
2269  */
2270  int qmin;
2271 
2272  /**
2273  * maximum quantizer
2274  * - encoding: Set by user.
2275  * - decoding: unused
2276  */
2277  int qmax;
2278 
2279  /**
2280  * maximum quantizer difference between frames
2281  * - encoding: Set by user.
2282  * - decoding: unused
2283  */
2285 
2286 #if FF_API_MPV_OPT
2287  /**
2288  * @deprecated use encoder private options instead
2289  */
2291  float rc_qsquish;
2292 
2297 #endif
2298 
2299  /**
2300  * decoder bitstream buffer size
2301  * - encoding: Set by user.
2302  * - decoding: unused
2303  */
2305 
2306  /**
2307  * ratecontrol override, see RcOverride
2308  * - encoding: Allocated/set/freed by user.
2309  * - decoding: unused
2310  */
2313 
2314 #if FF_API_MPV_OPT
2315  /**
2316  * @deprecated use encoder private options instead
2317  */
2319  const char *rc_eq;
2320 #endif
2321 
2322  /**
2323  * maximum bitrate
2324  * - encoding: Set by user.
2325  * - decoding: Set by libavcodec.
2326  */
2328 
2329  /**
2330  * minimum bitrate
2331  * - encoding: Set by user.
2332  * - decoding: unused
2333  */
2335 
2336 #if FF_API_MPV_OPT
2337  /**
2338  * @deprecated use encoder private options instead
2339  */
2342 
2345 #endif
2346 
2347  /**
2348  * Ratecontrol attempt to use, at maximum, <value> of what can be used without an underflow.
2349  * - encoding: Set by user.
2350  * - decoding: unused.
2351  */
2353 
2354  /**
2355  * Ratecontrol attempt to use, at least, <value> times the amount needed to prevent a vbv overflow.
2356  * - encoding: Set by user.
2357  * - decoding: unused.
2358  */
2360 
2361  /**
2362  * Number of bits which should be loaded into the rc buffer before decoding starts.
2363  * - encoding: Set by user.
2364  * - decoding: unused
2365  */
2367 
2368 #define FF_CODER_TYPE_VLC 0
2369 #define FF_CODER_TYPE_AC 1
2370 #define FF_CODER_TYPE_RAW 2
2371 #define FF_CODER_TYPE_RLE 3
2372 #if FF_API_UNUSED_MEMBERS
2373 #define FF_CODER_TYPE_DEFLATE 4
2374 #endif /* FF_API_UNUSED_MEMBERS */
2375  /**
2376  * coder type
2377  * - encoding: Set by user.
2378  * - decoding: unused
2379  */
2381 
2382  /**
2383  * context model
2384  * - encoding: Set by user.
2385  * - decoding: unused
2386  */
2388 
2389 #if FF_API_MPV_OPT
2390  /**
2391  * @deprecated use encoder private options instead
2392  */
2394  int lmin;
2395 
2396  /**
2397  * @deprecated use encoder private options instead
2398  */
2400  int lmax;
2401 #endif
2402 
2403  /**
2404  * frame skip threshold
2405  * - encoding: Set by user.
2406  * - decoding: unused
2407  */
2409 
2410  /**
2411  * frame skip factor
2412  * - encoding: Set by user.
2413  * - decoding: unused
2414  */
2416 
2417  /**
2418  * frame skip exponent
2419  * - encoding: Set by user.
2420  * - decoding: unused
2421  */
2423 
2424  /**
2425  * frame skip comparison function
2426  * - encoding: Set by user.
2427  * - decoding: unused
2428  */
2430 
2431  /**
2432  * trellis RD quantization
2433  * - encoding: Set by user.
2434  * - decoding: unused
2435  */
2436  int trellis;
2437 
2438  /**
2439  * - encoding: Set by user.
2440  * - decoding: unused
2441  */
2443 
2444  /**
2445  * - encoding: Set by user.
2446  * - decoding: unused
2447  */
2449 
2450  /**
2451  * GOP timecode frame start number
2452  * - encoding: Set by user, in non drop frame format
2453  * - decoding: Set by libavcodec (timecode in the 25 bits format, -1 if unset)
2454  */
2456 
2457  /* The RTP callback: This function is called */
2458  /* every time the encoder has a packet to send. */
2459  /* It depends on the encoder if the data starts */
2460  /* with a Start Code (it should). H.263 does. */
2461  /* mb_nb contains the number of macroblocks */
2462  /* encoded in the RTP payload. */
2463  void (*rtp_callback)(struct AVCodecContext *avctx, void *data, int size, int mb_nb);
2464 
2465  int rtp_payload_size; /* The size of the RTP payload: the coder will */
2466  /* do its best to deliver a chunk with size */
2467  /* below rtp_payload_size, the chunk will start */
2468  /* with a start code on some codecs like H.263. */
2469  /* This doesn't take account of any particular */
2470  /* headers inside the transmitted RTP payload. */
2471 
2472  /* statistics, used for 2-pass encoding */
2473  int mv_bits;
2477  int i_count;
2478  int p_count;
2481 
2482  /**
2483  * number of bits used for the previously encoded frame
2484  * - encoding: Set by libavcodec.
2485  * - decoding: unused
2486  */
2488 
2489  /**
2490  * pass1 encoding statistics output buffer
2491  * - encoding: Set by libavcodec.
2492  * - decoding: unused
2493  */
2494  char *stats_out;
2495 
2496  /**
2497  * pass2 encoding statistics input buffer
2498  * Concatenated stuff from stats_out of pass1 should be placed here.
2499  * - encoding: Allocated/set/freed by user.
2500  * - decoding: unused
2501  */
2502  char *stats_in;
2503 
2504  /**
2505  * Work around bugs in encoders which sometimes cannot be detected automatically.
2506  * - encoding: Set by user
2507  * - decoding: Set by user
2508  */
2510 #define FF_BUG_AUTODETECT 1 ///< autodetection
2511 #if FF_API_OLD_MSMPEG4
2512 #define FF_BUG_OLD_MSMPEG4 2
2513 #endif
2514 #define FF_BUG_XVID_ILACE 4
2515 #define FF_BUG_UMP4 8
2516 #define FF_BUG_NO_PADDING 16
2517 #define FF_BUG_AMV 32
2518 #if FF_API_AC_VLC
2519 #define FF_BUG_AC_VLC 0 ///< Will be removed, libavcodec can now handle these non-compliant files by default.
2520 #endif
2521 #define FF_BUG_QPEL_CHROMA 64
2522 #define FF_BUG_STD_QPEL 128
2523 #define FF_BUG_QPEL_CHROMA2 256
2524 #define FF_BUG_DIRECT_BLOCKSIZE 512
2525 #define FF_BUG_EDGE 1024
2526 #define FF_BUG_HPEL_CHROMA 2048
2527 #define FF_BUG_DC_CLIP 4096
2528 #define FF_BUG_MS 8192 ///< Work around various bugs in Microsoft's broken decoders.
2529 #define FF_BUG_TRUNCATED 16384
2530 
2531  /**
2532  * strictly follow the standard (MPEG4, ...).
2533  * - encoding: Set by user.
2534  * - decoding: Set by user.
2535  * Setting this to STRICT or higher means the encoder and decoder will
2536  * generally do stupid things, whereas setting it to unofficial or lower
2537  * will mean the encoder might produce output that is not supported by all
2538  * spec-compliant decoders. Decoders don't differentiate between normal,
2539  * unofficial and experimental (that is, they always try to decode things
2540  * when they can) unless they are explicitly asked to behave stupidly
2541  * (=strictly conform to the specs)
2542  */
2544 #define FF_COMPLIANCE_VERY_STRICT 2 ///< Strictly conform to an older more strict version of the spec or reference software.
2545 #define FF_COMPLIANCE_STRICT 1 ///< Strictly conform to all the things in the spec no matter what consequences.
2546 #define FF_COMPLIANCE_NORMAL 0
2547 #define FF_COMPLIANCE_UNOFFICIAL -1 ///< Allow unofficial extensions
2548 #define FF_COMPLIANCE_EXPERIMENTAL -2 ///< Allow nonstandardized experimental things.
2549 
2550  /**
2551  * error concealment flags
2552  * - encoding: unused
2553  * - decoding: Set by user.
2554  */
2556 #define FF_EC_GUESS_MVS 1
2557 #define FF_EC_DEBLOCK 2
2558 #define FF_EC_FAVOR_INTER 256
2559 
2560  /**
2561  * debug
2562  * - encoding: Set by user.
2563  * - decoding: Set by user.
2564  */
2565  int debug;
2566 #define FF_DEBUG_PICT_INFO 1
2567 #define FF_DEBUG_RC 2
2568 #define FF_DEBUG_BITSTREAM 4
2569 #define FF_DEBUG_MB_TYPE 8
2570 #define FF_DEBUG_QP 16
2571 #if FF_API_DEBUG_MV
2572 /**
2573  * @deprecated this option does nothing
2574  */
2575 #define FF_DEBUG_MV 32
2576 #endif
2577 #define FF_DEBUG_DCT_COEFF 0x00000040
2578 #define FF_DEBUG_SKIP 0x00000080
2579 #define FF_DEBUG_STARTCODE 0x00000100
2580 #if FF_API_UNUSED_MEMBERS
2581 #define FF_DEBUG_PTS 0x00000200
2582 #endif /* FF_API_UNUSED_MEMBERS */
2583 #define FF_DEBUG_ER 0x00000400
2584 #define FF_DEBUG_MMCO 0x00000800
2585 #define FF_DEBUG_BUGS 0x00001000
2586 #if FF_API_DEBUG_MV
2587 #define FF_DEBUG_VIS_QP 0x00002000 ///< only access through AVOptions from outside libavcodec
2588 #define FF_DEBUG_VIS_MB_TYPE 0x00004000 ///< only access through AVOptions from outside libavcodec
2589 #endif
2590 #define FF_DEBUG_BUFFERS 0x00008000
2591 #define FF_DEBUG_THREADS 0x00010000
2592 #define FF_DEBUG_NOMC 0x01000000
2593 
2594 #if FF_API_DEBUG_MV
2595  /**
2596  * debug
2597  * Code outside libavcodec should access this field using AVOptions
2598  * - encoding: Set by user.
2599  * - decoding: Set by user.
2600  */
2602 #define FF_DEBUG_VIS_MV_P_FOR 0x00000001 //visualize forward predicted MVs of P frames
2603 #define FF_DEBUG_VIS_MV_B_FOR 0x00000002 //visualize forward predicted MVs of B frames
2604 #define FF_DEBUG_VIS_MV_B_BACK 0x00000004 //visualize backward predicted MVs of B frames
2605 #endif
2606 
2607  /**
2608  * Error recognition; may misdetect some more or less valid parts as errors.
2609  * - encoding: unused
2610  * - decoding: Set by user.
2611  */
2613 
2614 /**
2615  * Verify checksums embedded in the bitstream (could be of either encoded or
2616  * decoded data, depending on the codec) and print an error message on mismatch.
2617  * If AV_EF_EXPLODE is also set, a mismatching checksum will result in the
2618  * decoder returning an error.
2619  */
2620 #define AV_EF_CRCCHECK (1<<0)
2621 #define AV_EF_BITSTREAM (1<<1) ///< detect bitstream specification deviations
2622 #define AV_EF_BUFFER (1<<2) ///< detect improper bitstream length
2623 #define AV_EF_EXPLODE (1<<3) ///< abort decoding on minor error detection
2624 
2625 #define AV_EF_IGNORE_ERR (1<<15) ///< ignore errors and continue
2626 #define AV_EF_CAREFUL (1<<16) ///< consider things that violate the spec, are fast to calculate and have not been seen in the wild as errors
2627 #define AV_EF_COMPLIANT (1<<17) ///< consider all spec non compliances as errors
2628 #define AV_EF_AGGRESSIVE (1<<18) ///< consider things that a sane encoder should not do as an error
2629 
2630 
2631  /**
2632  * opaque 64bit number (generally a PTS) that will be reordered and
2633  * output in AVFrame.reordered_opaque
2634  * - encoding: unused
2635  * - decoding: Set by user.
2636  */
2638 
2639  /**
2640  * Hardware accelerator in use
2641  * - encoding: unused.
2642  * - decoding: Set by libavcodec
2643  */
2645 
2646  /**
2647  * Hardware accelerator context.
2648  * For some hardware accelerators, a global context needs to be
2649  * provided by the user. In that case, this holds display-dependent
2650  * data FFmpeg cannot instantiate itself. Please refer to the
2651  * FFmpeg HW accelerator documentation to know how to fill this
2652  * is. e.g. for VA API, this is a struct vaapi_context.
2653  * - encoding: unused
2654  * - decoding: Set by user
2655  */
2657 
2658  /**
2659  * error
2660  * - encoding: Set by libavcodec if flags&CODEC_FLAG_PSNR.
2661  * - decoding: unused
2662  */
2664 
2665  /**
2666  * DCT algorithm, see FF_DCT_* below
2667  * - encoding: Set by user.
2668  * - decoding: unused
2669  */
2671 #define FF_DCT_AUTO 0
2672 #define FF_DCT_FASTINT 1
2673 #if FF_API_UNUSED_MEMBERS
2674 #define FF_DCT_INT 2
2675 #endif /* FF_API_UNUSED_MEMBERS */
2676 #define FF_DCT_MMX 3
2677 #define FF_DCT_ALTIVEC 5
2678 #define FF_DCT_FAAN 6
2679 
2680  /**
2681  * IDCT algorithm, see FF_IDCT_* below.
2682  * - encoding: Set by user.
2683  * - decoding: Set by user.
2684  */
2686 #define FF_IDCT_AUTO 0
2687 #define FF_IDCT_INT 1
2688 #define FF_IDCT_SIMPLE 2
2689 #define FF_IDCT_SIMPLEMMX 3
2690 #define FF_IDCT_ARM 7
2691 #define FF_IDCT_ALTIVEC 8
2692 #if FF_API_ARCH_SH4
2693 #define FF_IDCT_SH4 9
2694 #endif
2695 #define FF_IDCT_SIMPLEARM 10
2696 #if FF_API_UNUSED_MEMBERS
2697 #define FF_IDCT_IPP 13
2698 #endif /* FF_API_UNUSED_MEMBERS */
2699 #define FF_IDCT_XVID 14
2700 #if FF_API_IDCT_XVIDMMX
2701 #define FF_IDCT_XVIDMMX 14
2702 #endif /* FF_API_IDCT_XVIDMMX */
2703 #define FF_IDCT_SIMPLEARMV5TE 16
2704 #define FF_IDCT_SIMPLEARMV6 17
2705 #if FF_API_ARCH_SPARC
2706 #define FF_IDCT_SIMPLEVIS 18
2707 #endif
2708 #define FF_IDCT_FAAN 20
2709 #define FF_IDCT_SIMPLENEON 22
2710 #if FF_API_ARCH_ALPHA
2711 #define FF_IDCT_SIMPLEALPHA 23
2712 #endif
2713 #define FF_IDCT_SIMPLEAUTO 128
2714 
2715  /**
2716  * bits per sample/pixel from the demuxer (needed for huffyuv).
2717  * - encoding: Set by libavcodec.
2718  * - decoding: Set by user.
2719  */
2721 
2722  /**
2723  * Bits per sample/pixel of internal libavcodec pixel/sample format.
2724  * - encoding: set by user.
2725  * - decoding: set by libavcodec.
2726  */
2728 
2729 #if FF_API_LOWRES
2730  /**
2731  * low resolution decoding, 1-> 1/2 size, 2->1/4 size
2732  * - encoding: unused
2733  * - decoding: Set by user.
2734  * Code outside libavcodec should access this field using:
2735  * av_codec_{get,set}_lowres(avctx)
2736  */
2737  int lowres;
2738 #endif
2739 
2740  /**
2741  * the picture in the bitstream
2742  * - encoding: Set by libavcodec.
2743  * - decoding: unused
2744  */
2746 
2747  /**
2748  * thread count
2749  * is used to decide how many independent tasks should be passed to execute()
2750  * - encoding: Set by user.
2751  * - decoding: Set by user.
2752  */
2754 
2755  /**
2756  * Which multithreading methods to use.
2757  * Use of FF_THREAD_FRAME will increase decoding delay by one frame per thread,
2758  * so clients which cannot provide future frames should not use it.
2759  *
2760  * - encoding: Set by user, otherwise the default is used.
2761  * - decoding: Set by user, otherwise the default is used.
2762  */
2764 #define FF_THREAD_FRAME 1 ///< Decode more than one frame at once
2765 #define FF_THREAD_SLICE 2 ///< Decode more than one part of a single frame at once
2766 
2767  /**
2768  * Which multithreading methods are in use by the codec.
2769  * - encoding: Set by libavcodec.
2770  * - decoding: Set by libavcodec.
2771  */
2773 
2774  /**
2775  * Set by the client if its custom get_buffer() callback can be called
2776  * synchronously from another thread, which allows faster multithreaded decoding.
2777  * draw_horiz_band() will be called from other threads regardless of this setting.
2778  * Ignored if the default get_buffer() is used.
2779  * - encoding: Set by user.
2780  * - decoding: Set by user.
2781  */
2783 
2784  /**
2785  * The codec may call this to execute several independent things.
2786  * It will return only after finishing all tasks.
2787  * The user may replace this with some multithreaded implementation,
2788  * the default implementation will execute the parts serially.
2789  * @param count the number of things to execute
2790  * - encoding: Set by libavcodec, user can override.
2791  * - decoding: Set by libavcodec, user can override.
2792  */
2793  int (*execute)(struct AVCodecContext *c, int (*func)(struct AVCodecContext *c2, void *arg), void *arg2, int *ret, int count, int size);
2794 
2795  /**
2796  * The codec may call this to execute several independent things.
2797  * It will return only after finishing all tasks.
2798  * The user may replace this with some multithreaded implementation,
2799  * the default implementation will execute the parts serially.
2800  * Also see avcodec_thread_init and e.g. the --enable-pthread configure option.
2801  * @param c context passed also to func
2802  * @param count the number of things to execute
2803  * @param arg2 argument passed unchanged to func
2804  * @param ret return values of executed functions, must have space for "count" values. May be NULL.
2805  * @param func function that will be called count times, with jobnr from 0 to count-1.
2806  * threadnr will be in the range 0 to c->thread_count-1 < MAX_THREADS and so that no
2807  * two instances of func executing at the same time will have the same threadnr.
2808  * @return always 0 currently, but code should handle a future improvement where when any call to func
2809  * returns < 0 no further calls to func may be done and < 0 is returned.
2810  * - encoding: Set by libavcodec, user can override.
2811  * - decoding: Set by libavcodec, user can override.
2812  */
2813  int (*execute2)(struct AVCodecContext *c, int (*func)(struct AVCodecContext *c2, void *arg, int jobnr, int threadnr), void *arg2, int *ret, int count);
2814 
2815 #if FF_API_THREAD_OPAQUE
2816  /**
2817  * @deprecated this field should not be used from outside of lavc
2818  */
2821 #endif
2822 
2823  /**
2824  * noise vs. sse weight for the nsse comparison function
2825  * - encoding: Set by user.
2826  * - decoding: unused
2827  */
2829 
2830  /**
2831  * profile
2832  * - encoding: Set by user.
2833  * - decoding: Set by libavcodec.
2834  */
2835  int profile;
2836 #define FF_PROFILE_UNKNOWN -99
2837 #define FF_PROFILE_RESERVED -100
2838 
2839 #define FF_PROFILE_AAC_MAIN 0
2840 #define FF_PROFILE_AAC_LOW 1
2841 #define FF_PROFILE_AAC_SSR 2
2842 #define FF_PROFILE_AAC_LTP 3
2843 #define FF_PROFILE_AAC_HE 4
2844 #define FF_PROFILE_AAC_HE_V2 28
2845 #define FF_PROFILE_AAC_LD 22
2846 #define FF_PROFILE_AAC_ELD 38
2847 #define FF_PROFILE_MPEG2_AAC_LOW 128
2848 #define FF_PROFILE_MPEG2_AAC_HE 131
2849 
2850 #define FF_PROFILE_DTS 20
2851 #define FF_PROFILE_DTS_ES 30
2852 #define FF_PROFILE_DTS_96_24 40
2853 #define FF_PROFILE_DTS_HD_HRA 50
2854 #define FF_PROFILE_DTS_HD_MA 60
2855 #define FF_PROFILE_DTS_EXPRESS 70
2856 
2857 #define FF_PROFILE_MPEG2_422 0
2858 #define FF_PROFILE_MPEG2_HIGH 1
2859 #define FF_PROFILE_MPEG2_SS 2
2860 #define FF_PROFILE_MPEG2_SNR_SCALABLE 3
2861 #define FF_PROFILE_MPEG2_MAIN 4
2862 #define FF_PROFILE_MPEG2_SIMPLE 5
2863 
2864 #define FF_PROFILE_H264_CONSTRAINED (1<<9) // 8+1; constraint_set1_flag
2865 #define FF_PROFILE_H264_INTRA (1<<11) // 8+3; constraint_set3_flag
2866 
2867 #define FF_PROFILE_H264_BASELINE 66
2868 #define FF_PROFILE_H264_CONSTRAINED_BASELINE (66|FF_PROFILE_H264_CONSTRAINED)
2869 #define FF_PROFILE_H264_MAIN 77
2870 #define FF_PROFILE_H264_EXTENDED 88
2871 #define FF_PROFILE_H264_HIGH 100
2872 #define FF_PROFILE_H264_HIGH_10 110
2873 #define FF_PROFILE_H264_HIGH_10_INTRA (110|FF_PROFILE_H264_INTRA)
2874 #define FF_PROFILE_H264_HIGH_422 122
2875 #define FF_PROFILE_H264_HIGH_422_INTRA (122|FF_PROFILE_H264_INTRA)
2876 #define FF_PROFILE_H264_HIGH_444 144
2877 #define FF_PROFILE_H264_HIGH_444_PREDICTIVE 244
2878 #define FF_PROFILE_H264_HIGH_444_INTRA (244|FF_PROFILE_H264_INTRA)
2879 #define FF_PROFILE_H264_CAVLC_444 44
2880 
2881 #define FF_PROFILE_VC1_SIMPLE 0
2882 #define FF_PROFILE_VC1_MAIN 1
2883 #define FF_PROFILE_VC1_COMPLEX 2
2884 #define FF_PROFILE_VC1_ADVANCED 3
2885 
2886 #define FF_PROFILE_MPEG4_SIMPLE 0
2887 #define FF_PROFILE_MPEG4_SIMPLE_SCALABLE 1
2888 #define FF_PROFILE_MPEG4_CORE 2
2889 #define FF_PROFILE_MPEG4_MAIN 3
2890 #define FF_PROFILE_MPEG4_N_BIT 4
2891 #define FF_PROFILE_MPEG4_SCALABLE_TEXTURE 5
2892 #define FF_PROFILE_MPEG4_SIMPLE_FACE_ANIMATION 6
2893 #define FF_PROFILE_MPEG4_BASIC_ANIMATED_TEXTURE 7
2894 #define FF_PROFILE_MPEG4_HYBRID 8
2895 #define FF_PROFILE_MPEG4_ADVANCED_REAL_TIME 9
2896 #define FF_PROFILE_MPEG4_CORE_SCALABLE 10
2897 #define FF_PROFILE_MPEG4_ADVANCED_CODING 11
2898 #define FF_PROFILE_MPEG4_ADVANCED_CORE 12
2899 #define FF_PROFILE_MPEG4_ADVANCED_SCALABLE_TEXTURE 13
2900 #define FF_PROFILE_MPEG4_SIMPLE_STUDIO 14
2901 #define FF_PROFILE_MPEG4_ADVANCED_SIMPLE 15
2902 
2903 #define FF_PROFILE_JPEG2000_CSTREAM_RESTRICTION_0 0
2904 #define FF_PROFILE_JPEG2000_CSTREAM_RESTRICTION_1 1
2905 #define FF_PROFILE_JPEG2000_CSTREAM_NO_RESTRICTION 2
2906 #define FF_PROFILE_JPEG2000_DCINEMA_2K 3
2907 #define FF_PROFILE_JPEG2000_DCINEMA_4K 4
2908 
2909 
2910 #define FF_PROFILE_HEVC_MAIN 1
2911 #define FF_PROFILE_HEVC_MAIN_10 2
2912 #define FF_PROFILE_HEVC_MAIN_STILL_PICTURE 3
2913 #define FF_PROFILE_HEVC_REXT 4
2914 
2915 #define FF_PROFILE_VP9_0 0
2916 #define FF_PROFILE_VP9_1 1
2917 #define FF_PROFILE_VP9_2 2
2918 #define FF_PROFILE_VP9_3 3
2919 
2920  /**
2921  * level
2922  * - encoding: Set by user.
2923  * - decoding: Set by libavcodec.
2924  */
2925  int level;
2926 #define FF_LEVEL_UNKNOWN -99
2927 
2928  /**
2929  * Skip loop filtering for selected frames.
2930  * - encoding: unused
2931  * - decoding: Set by user.
2932  */
2934 
2935  /**
2936  * Skip IDCT/dequantization for selected frames.
2937  * - encoding: unused
2938  * - decoding: Set by user.
2939  */
2941 
2942  /**
2943  * Skip decoding for selected frames.
2944  * - encoding: unused
2945  * - decoding: Set by user.
2946  */
2948 
2949  /**
2950  * Header containing style information for text subtitles.
2951  * For SUBTITLE_ASS subtitle type, it should contain the whole ASS
2952  * [Script Info] and [V4+ Styles] section, plus the [Events] line and
2953  * the Format line following. It shouldn't include any Dialogue line.
2954  * - encoding: Set/allocated/freed by user (before avcodec_open2())
2955  * - decoding: Set/allocated/freed by libavcodec (by avcodec_open2())
2956  */
2959 
2960 #if FF_API_ERROR_RATE
2961  /**
2962  * @deprecated use the 'error_rate' private AVOption of the mpegvideo
2963  * encoders
2964  */
2967 #endif
2968 
2969 #if FF_API_CODEC_PKT
2970  /**
2971  * @deprecated this field is not supposed to be accessed from outside lavc
2972  */
2975 #endif
2976 
2977  /**
2978  * VBV delay coded in the last frame (in periods of a 27 MHz clock).
2979  * Used for compliant TS muxing.
2980  * - encoding: Set by libavcodec.
2981  * - decoding: unused.
2982  */
2983  uint64_t vbv_delay;
2984 
2985  /**
2986  * Encoding only. Allow encoders to output packets that do not contain any
2987  * encoded data, only side data.
2988  *
2989  * Some encoders need to output such packets, e.g. to update some stream
2990  * parameters at the end of encoding.
2991  *
2992  * All callers are strongly recommended to set this option to 1 and update
2993  * their code to deal with such packets, since this behaviour may become
2994  * always enabled in the future (then this option will be deprecated and
2995  * later removed). To avoid ABI issues when this happens, the callers should
2996  * use AVOptions to set this field.
2997  */
2999 
3000  /**
3001  * Audio only. The number of "priming" samples (padding) inserted by the
3002  * encoder at the beginning of the audio. I.e. this number of leading
3003  * decoded samples must be discarded by the caller to get the original audio
3004  * without leading padding.
3005  *
3006  * - decoding: unused
3007  * - encoding: Set by libavcodec. The timestamps on the output packets are
3008  * adjusted by the encoder so that they always refer to the
3009  * first sample of the data actually contained in the packet,
3010  * including any added padding. E.g. if the timebase is
3011  * 1/samplerate and the timestamp of the first input sample is
3012  * 0, the timestamp of the first output packet will be
3013  * -initial_padding.
3014  */
3016 
3017  /**
3018  * - decoding: For codecs that store a framerate value in the compressed
3019  * bitstream, the decoder may export it here. { 0, 1} when
3020  * unknown.
3021  * - encoding: unused
3022  */
3024 
3025  /**
3026  * Nominal unaccelerated pixel format, see AV_PIX_FMT_xxx.
3027  * - encoding: unused.
3028  * - decoding: Set by libavcodec before calling get_format()
3029  */
3031 
3032  /**
3033  * Timebase in which pkt_dts/pts and AVPacket.dts/pts are.
3034  * Code outside libavcodec should access this field using:
3035  * av_codec_{get,set}_pkt_timebase(avctx)
3036  * - encoding unused.
3037  * - decoding set by user.
3038  */
3040 
3041  /**
3042  * AVCodecDescriptor
3043  * Code outside libavcodec should access this field using:
3044  * av_codec_{get,set}_codec_descriptor(avctx)
3045  * - encoding: unused.
3046  * - decoding: set by libavcodec.
3047  */
3049 
3050 #if !FF_API_LOWRES
3051  /**
3052  * low resolution decoding, 1-> 1/2 size, 2->1/4 size
3053  * - encoding: unused
3054  * - decoding: Set by user.
3055  * Code outside libavcodec should access this field using:
3056  * av_codec_{get,set}_lowres(avctx)
3057  */
3058  int lowres;
3059 #endif
3060 
3061  /**
3062  * Current statistics for PTS correction.
3063  * - decoding: maintained and used by libavcodec, not intended to be used by user apps
3064  * - encoding: unused
3065  */
3066  int64_t pts_correction_num_faulty_pts; /// Number of incorrect PTS values so far
3067  int64_t pts_correction_num_faulty_dts; /// Number of incorrect DTS values so far
3068  int64_t pts_correction_last_pts; /// PTS of the last frame
3069  int64_t pts_correction_last_dts; /// DTS of the last frame
3070 
3071  /**
3072  * Character encoding of the input subtitles file.
3073  * - decoding: set by user
3074  * - encoding: unused
3075  */
3077 
3078  /**
3079  * Subtitles character encoding mode. Formats or codecs might be adjusting
3080  * this setting (if they are doing the conversion themselves for instance).
3081  * - decoding: set by libavcodec
3082  * - encoding: unused
3083  */
3085 #define FF_SUB_CHARENC_MODE_DO_NOTHING -1 ///< do nothing (demuxer outputs a stream supposed to be already in UTF-8, or the codec is bitmap for instance)
3086 #define FF_SUB_CHARENC_MODE_AUTOMATIC 0 ///< libavcodec will select the mode itself
3087 #define FF_SUB_CHARENC_MODE_PRE_DECODER 1 ///< the AVPacket data needs to be recoded to UTF-8 before being fed to the decoder, requires iconv
3088 
3089  /**
3090  * Skip processing alpha if supported by codec.
3091  * Note that if the format uses pre-multiplied alpha (common with VP6,
3092  * and recommended due to better video quality/compression)
3093  * the image will look as if alpha-blended onto a black background.
3094  * However for formats that do not use pre-multiplied alpha
3095  * there might be serious artefacts (though e.g. libswscale currently
3096  * assumes pre-multiplied alpha anyway).
3097  * Code outside libavcodec should access this field using AVOptions
3098  *
3099  * - decoding: set by user
3100  * - encoding: unused
3101  */
3103 
3104  /**
3105  * Number of samples to skip after a discontinuity
3106  * - decoding: unused
3107  * - encoding: set by libavcodec
3108  */
3110 
3111 #if !FF_API_DEBUG_MV
3112  /**
3113  * debug motion vectors
3114  * Code outside libavcodec should access this field using AVOptions
3115  * - encoding: Set by user.
3116  * - decoding: Set by user.
3117  */
3118  int debug_mv;
3119 #define FF_DEBUG_VIS_MV_P_FOR 0x00000001 //visualize forward predicted MVs of P frames
3120 #define FF_DEBUG_VIS_MV_B_FOR 0x00000002 //visualize forward predicted MVs of B frames
3121 #define FF_DEBUG_VIS_MV_B_BACK 0x00000004 //visualize backward predicted MVs of B frames
3122 #endif
3123 
3124  /**
3125  * custom intra quantization matrix
3126  * Code outside libavcodec should access this field using av_codec_g/set_chroma_intra_matrix()
3127  * - encoding: Set by user, can be NULL.
3128  * - decoding: unused.
3129  */
3131 
3132  /**
3133  * dump format separator.
3134  * can be ", " or "\n " or anything else
3135  * Code outside libavcodec should access this field using AVOptions
3136  * (NO direct access).
3137  * - encoding: Set by user.
3138  * - decoding: Set by user.
3139  */
3141 
3142  /**
3143  * ',' separated list of allowed decoders.
3144  * If NULL then all are allowed
3145  * - encoding: unused
3146  * - decoding: set by user through AVOPtions (NO direct access)
3147  */
3149 } AVCodecContext;
3150 
3153 
3156 
3157 int av_codec_get_lowres(const AVCodecContext *avctx);
3158 void av_codec_set_lowres(AVCodecContext *avctx, int val);
3159 
3160 int av_codec_get_seek_preroll(const AVCodecContext *avctx);
3161 void av_codec_set_seek_preroll(AVCodecContext *avctx, int val);
3162 
3163 uint16_t *av_codec_get_chroma_intra_matrix(const AVCodecContext *avctx);
3164 void av_codec_set_chroma_intra_matrix(AVCodecContext *avctx, uint16_t *val);
3165 
3166 /**
3167  * AVProfile.
3168  */
3169 typedef struct AVProfile {
3170  int profile;
3171  const char *name; ///< short name for the profile
3172 } AVProfile;
3173 
3174 typedef struct AVCodecDefault AVCodecDefault;
3175 
3176 struct AVSubtitle;
3177 
3178 /**
3179  * AVCodec.
3180  */
3181 typedef struct AVCodec {
3182  /**
3183  * Name of the codec implementation.
3184  * The name is globally unique among encoders and among decoders (but an
3185  * encoder and a decoder can share the same name).
3186  * This is the primary way to find a codec from the user perspective.
3187  */
3188  const char *name;
3189  /**
3190  * Descriptive name for the codec, meant to be more human readable than name.
3191  * You should use the NULL_IF_CONFIG_SMALL() macro to define it.
3192  */
3193  const char *long_name;
3196  /**
3197  * Codec capabilities.
3198  * see CODEC_CAP_*
3199  */
3201  const AVRational *supported_framerates; ///< array of supported framerates, or NULL if any, array is terminated by {0,0}
3202  const enum AVPixelFormat *pix_fmts; ///< array of supported pixel formats, or NULL if unknown, array is terminated by -1
3203  const int *supported_samplerates; ///< array of supported audio samplerates, or NULL if unknown, array is terminated by 0
3204  const enum AVSampleFormat *sample_fmts; ///< array of supported sample formats, or NULL if unknown, array is terminated by -1
3205  const uint64_t *channel_layouts; ///< array of support channel layouts, or NULL if unknown. array is terminated by 0
3206 #if FF_API_LOWRES
3207  uint8_t max_lowres; ///< maximum value for lowres supported by the decoder, no direct access, use av_codec_get_max_lowres()
3208 #endif
3209  const AVClass *priv_class; ///< AVClass for the private context
3210  const AVProfile *profiles; ///< array of recognized profiles, or NULL if unknown, array is terminated by {FF_PROFILE_UNKNOWN}
3211 
3212  /*****************************************************************
3213  * No fields below this line are part of the public API. They
3214  * may not be used outside of libavcodec and can be changed and
3215  * removed at will.
3216  * New public fields should be added right above.
3217  *****************************************************************
3218  */
3220  struct AVCodec *next;
3221  /**
3222  * @name Frame-level threading support functions
3223  * @{
3224  */
3225  /**
3226  * If defined, called on thread contexts when they are created.
3227  * If the codec allocates writable tables in init(), re-allocate them here.
3228  * priv_data will be set to a copy of the original.
3229  */
3231  /**
3232  * Copy necessary context variables from a previous thread context to the current one.
3233  * If not defined, the next thread will start automatically; otherwise, the codec
3234  * must call ff_thread_finish_setup().
3235  *
3236  * dst and src will (rarely) point to the same context, in which case memcpy should be skipped.
3237  */
3239  /** @} */
3240 
3241  /**
3242  * Private codec-specific defaults.
3243  */
3245 
3246  /**
3247  * Initialize codec static data, called from avcodec_register().
3248  */
3249  void (*init_static_data)(struct AVCodec *codec);
3250 
3252  int (*encode_sub)(AVCodecContext *, uint8_t *buf, int buf_size,
3253  const struct AVSubtitle *sub);
3254  /**
3255  * Encode data to an AVPacket.
3256  *
3257  * @param avctx codec context
3258  * @param avpkt output AVPacket (may contain a user-provided buffer)
3259  * @param[in] frame AVFrame containing the raw data to be encoded
3260  * @param[out] got_packet_ptr encoder sets to 0 or 1 to indicate that a
3261  * non-empty packet was returned in avpkt.
3262  * @return 0 on success, negative error code on failure
3263  */
3264  int (*encode2)(AVCodecContext *avctx, AVPacket *avpkt, const AVFrame *frame,
3265  int *got_packet_ptr);
3266  int (*decode)(AVCodecContext *, void *outdata, int *outdata_size, AVPacket *avpkt);
3268  /**
3269  * Flush buffers.
3270  * Will be called when seeking
3271  */
3273  /**
3274  * Internal codec capabilities.
3275  * See FF_CODEC_CAP_* in internal.h
3276  */
3278 } AVCodec;
3279 
3280 int av_codec_get_max_lowres(const AVCodec *codec);
3281 
3282 struct MpegEncContext;
3283 
3284 /**
3285  * @defgroup lavc_hwaccel AVHWAccel
3286  * @{
3287  */
3288 typedef struct AVHWAccel {
3289  /**
3290  * Name of the hardware accelerated codec.
3291  * The name is globally unique among encoders and among decoders (but an
3292  * encoder and a decoder can share the same name).
3293  */
3294  const char *name;
3295 
3296  /**
3297  * Type of codec implemented by the hardware accelerator.
3298  *
3299  * See AVMEDIA_TYPE_xxx
3300  */
3302 
3303  /**
3304  * Codec implemented by the hardware accelerator.
3305  *
3306  * See AV_CODEC_ID_xxx
3307  */
3309 
3310  /**
3311  * Supported pixel format.
3312  *
3313  * Only hardware accelerated formats are supported here.
3314  */
3316 
3317  /**
3318  * Hardware accelerated codec capabilities.
3319  * see FF_HWACCEL_CODEC_CAP_*
3320  */
3322 
3323  /*****************************************************************
3324  * No fields below this line are part of the public API. They
3325  * may not be used outside of libavcodec and can be changed and
3326  * removed at will.
3327  * New public fields should be added right above.
3328  *****************************************************************
3329  */
3330  struct AVHWAccel *next;
3331 
3332  /**
3333  * Allocate a custom buffer
3334  */
3336 
3337  /**
3338  * Called at the beginning of each frame or field picture.
3339  *
3340  * Meaningful frame information (codec specific) is guaranteed to
3341  * be parsed at this point. This function is mandatory.
3342  *
3343  * Note that buf can be NULL along with buf_size set to 0.
3344  * Otherwise, this means the whole frame is available at this point.
3345  *
3346  * @param avctx the codec context
3347  * @param buf the frame data buffer base
3348  * @param buf_size the size of the frame in bytes
3349  * @return zero if successful, a negative value otherwise
3350  */
3351  int (*start_frame)(AVCodecContext *avctx, const uint8_t *buf, uint32_t buf_size);
3352 
3353  /**
3354  * Callback for each slice.
3355  *
3356  * Meaningful slice information (codec specific) is guaranteed to
3357  * be parsed at this point. This function is mandatory.
3358  * The only exception is XvMC, that works on MB level.
3359  *
3360  * @param avctx the codec context
3361  * @param buf the slice data buffer base
3362  * @param buf_size the size of the slice in bytes
3363  * @return zero if successful, a negative value otherwise
3364  */
3365  int (*decode_slice)(AVCodecContext *avctx, const uint8_t *buf, uint32_t buf_size);
3366 
3367  /**
3368  * Called at the end of each frame or field picture.
3369  *
3370  * The whole picture is parsed at this point and can now be sent
3371  * to the hardware accelerator. This function is mandatory.
3372  *
3373  * @param avctx the codec context
3374  * @return zero if successful, a negative value otherwise
3375  */
3376  int (*end_frame)(AVCodecContext *avctx);
3377 
3378  /**
3379  * Size of per-frame hardware accelerator private data.
3380  *
3381  * Private data is allocated with av_mallocz() before
3382  * AVCodecContext.get_buffer() and deallocated after
3383  * AVCodecContext.release_buffer().
3384  */
3386 
3387  /**
3388  * Called for every Macroblock in a slice.
3389  *
3390  * XvMC uses it to replace the ff_mpv_decode_mb().
3391  * Instead of decoding to raw picture, MB parameters are
3392  * stored in an array provided by the video driver.
3393  *
3394  * @param s the mpeg context
3395  */
3397 
3398  /**
3399  * Initialize the hwaccel private data.
3400  *
3401  * This will be called from ff_get_format(), after hwaccel and
3402  * hwaccel_context are set and the hwaccel private data in AVCodecInternal
3403  * is allocated.
3404  */
3406 
3407  /**
3408  * Uninitialize the hwaccel private data.
3409  *
3410  * This will be called from get_format() or avcodec_close(), after hwaccel
3411  * and hwaccel_context are already uninitialized.
3412  */
3414 
3415  /**
3416  * Size of the private data to allocate in
3417  * AVCodecInternal.hwaccel_priv_data.
3418  */
3420 } AVHWAccel;
3421 
3422 /**
3423  * Hardware acceleration should be used for decoding even if the codec level
3424  * used is unknown or higher than the maximum supported level reported by the
3425  * hardware driver.
3426  */
3427 #define AV_HWACCEL_FLAG_IGNORE_LEVEL (1 << 0)
3428 
3429 /**
3430  * Hardware acceleration can output YUV pixel formats with a different chroma
3431  * sampling than 4:2:0 and/or other than 8 bits per component.
3432  */
3433 #define AV_HWACCEL_FLAG_ALLOW_HIGH_DEPTH (1 << 1)
3434 
3435 /**
3436  * @}
3437  */
3438 
3439 /**
3440  * @defgroup lavc_picture AVPicture
3441  *
3442  * Functions for working with AVPicture
3443  * @{
3444  */
3445 
3446 /**
3447  * Picture data structure.
3448  *
3449  * Up to four components can be stored into it, the last component is
3450  * alpha.
3451  */
3452 typedef struct AVPicture {
3453  uint8_t *data[AV_NUM_DATA_POINTERS]; ///< pointers to the image data planes
3454  int linesize[AV_NUM_DATA_POINTERS]; ///< number of bytes per line
3455 } AVPicture;
3456 
3457 /**
3458  * @}
3459  */
3460 
3463 
3464  SUBTITLE_BITMAP, ///< A bitmap, pict will be set
3465 
3466  /**
3467  * Plain text, the text field must be set by the decoder and is
3468  * authoritative. ass and pict fields may contain approximations.
3469  */
3471 
3472  /**
3473  * Formatted text, the ass field must be set by the decoder and is
3474  * authoritative. pict and text fields may contain approximations.
3475  */
3477 };
3478 
3479 #define AV_SUBTITLE_FLAG_FORCED 0x00000001
3480 
3481 typedef struct AVSubtitleRect {
3482  int x; ///< top left corner of pict, undefined when pict is not set
3483  int y; ///< top left corner of pict, undefined when pict is not set
3484  int w; ///< width of pict, undefined when pict is not set
3485  int h; ///< height of pict, undefined when pict is not set
3486  int nb_colors; ///< number of colors in pict, undefined when pict is not set
3487 
3488  /**
3489  * data+linesize for the bitmap of this subtitle.
3490  * can be set for text/ass as well once they are rendered
3491  */
3494 
3495  char *text; ///< 0 terminated plain UTF-8 text
3496 
3497  /**
3498  * 0 terminated ASS/SSA compatible event line.
3499  * The presentation of this is unaffected by the other values in this
3500  * struct.
3501  */
3502  char *ass;
3503 
3504  int flags;
3505 } AVSubtitleRect;
3506 
3507 typedef struct AVSubtitle {
3508  uint16_t format; /* 0 = graphics */
3509  uint32_t start_display_time; /* relative to packet pts, in ms */
3510  uint32_t end_display_time; /* relative to packet pts, in ms */
3511  unsigned num_rects;
3513  int64_t pts; ///< Same as packet pts, in AV_TIME_BASE
3514 } AVSubtitle;
3515 
3516 /**
3517  * If c is NULL, returns the first registered codec,
3518  * if c is non-NULL, returns the next registered codec after c,
3519  * or NULL if c is the last one.
3520  */
3521 AVCodec *av_codec_next(const AVCodec *c);
3522 
3523 /**
3524  * Return the LIBAVCODEC_VERSION_INT constant.
3525  */
3526 unsigned avcodec_version(void);
3527 
3528 /**
3529  * Return the libavcodec build-time configuration.
3530  */
3531 const char *avcodec_configuration(void);
3532 
3533 /**
3534  * Return the libavcodec license.
3535  */
3536 const char *avcodec_license(void);
3537 
3538 /**
3539  * Register the codec codec and initialize libavcodec.
3540  *
3541  * @warning either this function or avcodec_register_all() must be called
3542  * before any other libavcodec functions.
3543  *
3544  * @see avcodec_register_all()
3545  */
3546 void avcodec_register(AVCodec *codec);
3547 
3548 /**
3549  * Register all the codecs, parsers and bitstream filters which were enabled at
3550  * configuration time. If you do not call this function you can select exactly
3551  * which formats you want to support, by using the individual registration
3552  * functions.
3553  *
3554  * @see avcodec_register
3555  * @see av_register_codec_parser
3556  * @see av_register_bitstream_filter
3557  */
3558 void avcodec_register_all(void);
3559 
3560 /**
3561  * Allocate an AVCodecContext and set its fields to default values. The
3562  * resulting struct should be freed with avcodec_free_context().
3563  *
3564  * @param codec if non-NULL, allocate private data and initialize defaults
3565  * for the given codec. It is illegal to then call avcodec_open2()
3566  * with a different codec.
3567  * If NULL, then the codec-specific defaults won't be initialized,
3568  * which may result in suboptimal default settings (this is
3569  * important mainly for encoders, e.g. libx264).
3570  *
3571  * @return An AVCodecContext filled with default values or NULL on failure.
3572  * @see avcodec_get_context_defaults
3573  */
3575 
3576 /**
3577  * Free the codec context and everything associated with it and write NULL to
3578  * the provided pointer.
3579  */
3580 void avcodec_free_context(AVCodecContext **avctx);
3581 
3582 /**
3583  * Set the fields of the given AVCodecContext to default values corresponding
3584  * to the given codec (defaults may be codec-dependent).
3585  *
3586  * Do not call this function if a non-NULL codec has been passed
3587  * to avcodec_alloc_context3() that allocated this AVCodecContext.
3588  * If codec is non-NULL, it is illegal to call avcodec_open2() with a
3589  * different codec on this AVCodecContext.
3590  */
3592 
3593 /**
3594  * Get the AVClass for AVCodecContext. It can be used in combination with
3595  * AV_OPT_SEARCH_FAKE_OBJ for examining options.
3596  *
3597  * @see av_opt_find().
3598  */
3599 const AVClass *avcodec_get_class(void);
3600 
3601 /**
3602  * Get the AVClass for AVFrame. It can be used in combination with
3603  * AV_OPT_SEARCH_FAKE_OBJ for examining options.
3604  *
3605  * @see av_opt_find().
3606  */
3607 const AVClass *avcodec_get_frame_class(void);
3608 
3609 /**
3610  * Get the AVClass for AVSubtitleRect. It can be used in combination with
3611  * AV_OPT_SEARCH_FAKE_OBJ for examining options.
3612  *
3613  * @see av_opt_find().
3614  */
3616 
3617 /**
3618  * Copy the settings of the source AVCodecContext into the destination
3619  * AVCodecContext. The resulting destination codec context will be
3620  * unopened, i.e. you are required to call avcodec_open2() before you
3621  * can use this AVCodecContext to decode/encode video/audio data.
3622  *
3623  * @param dest target codec context, should be initialized with
3624  * avcodec_alloc_context3(NULL), but otherwise uninitialized
3625  * @param src source codec context
3626  * @return AVERROR() on error (e.g. memory allocation error), 0 on success
3627  */
3629 
3630 #if FF_API_AVFRAME_LAVC
3631 /**
3632  * @deprecated use av_frame_alloc()
3633  */
3635 AVFrame *avcodec_alloc_frame(void);
3636 
3637 /**
3638  * Set the fields of the given AVFrame to default values.
3639  *
3640  * @param frame The AVFrame of which the fields should be set to default values.
3641  *
3642  * @deprecated use av_frame_unref()
3643  */
3645 void avcodec_get_frame_defaults(AVFrame *frame);
3646 
3647 /**
3648  * Free the frame and any dynamically allocated objects in it,
3649  * e.g. extended_data.
3650  *
3651  * @param frame frame to be freed. The pointer will be set to NULL.
3652  *
3653  * @warning this function does NOT free the data buffers themselves
3654  * (it does not know how, since they might have been allocated with
3655  * a custom get_buffer()).
3656  *
3657  * @deprecated use av_frame_free()
3658  */
3660 void avcodec_free_frame(AVFrame **frame);
3661 #endif
3662 
3663 /**
3664  * Initialize the AVCodecContext to use the given AVCodec. Prior to using this
3665  * function the context has to be allocated with avcodec_alloc_context3().
3666  *
3667  * The functions avcodec_find_decoder_by_name(), avcodec_find_encoder_by_name(),
3668  * avcodec_find_decoder() and avcodec_find_encoder() provide an easy way for
3669  * retrieving a codec.
3670  *
3671  * @warning This function is not thread safe!
3672  *
3673  * @note Always call this function before using decoding routines (such as
3674  * @ref avcodec_decode_video2()).
3675  *
3676  * @code
3677  * avcodec_register_all();
3678  * av_dict_set(&opts, "b", "2.5M", 0);
3679  * codec = avcodec_find_decoder(AV_CODEC_ID_H264);
3680  * if (!codec)
3681  * exit(1);
3682  *
3683  * context = avcodec_alloc_context3(codec);
3684  *
3685  * if (avcodec_open2(context, codec, opts) < 0)
3686  * exit(1);
3687  * @endcode
3688  *
3689  * @param avctx The context to initialize.
3690  * @param codec The codec to open this context for. If a non-NULL codec has been
3691  * previously passed to avcodec_alloc_context3() or
3692  * avcodec_get_context_defaults3() for this context, then this
3693  * parameter MUST be either NULL or equal to the previously passed
3694  * codec.
3695  * @param options A dictionary filled with AVCodecContext and codec-private options.
3696  * On return this object will be filled with options that were not found.
3697  *
3698  * @return zero on success, a negative value on error
3699  * @see avcodec_alloc_context3(), avcodec_find_decoder(), avcodec_find_encoder(),
3700  * av_dict_set(), av_opt_find().
3701  */
3702 int avcodec_open2(AVCodecContext *avctx, const AVCodec *codec, AVDictionary **options);
3703 
3704 /**
3705  * Close a given AVCodecContext and free all the data associated with it
3706  * (but not the AVCodecContext itself).
3707  *
3708  * Calling this function on an AVCodecContext that hasn't been opened will free
3709  * the codec-specific data allocated in avcodec_alloc_context3() /
3710  * avcodec_get_context_defaults3() with a non-NULL codec. Subsequent calls will
3711  * do nothing.
3712  */
3713 int avcodec_close(AVCodecContext *avctx);
3714 
3715 /**
3716  * Free all allocated data in the given subtitle struct.
3717  *
3718  * @param sub AVSubtitle to free.
3719  */
3720 void avsubtitle_free(AVSubtitle *sub);
3721 
3722 /**
3723  * @}
3724  */
3725 
3726 /**
3727  * @addtogroup lavc_packet
3728  * @{
3729  */
3730 
3731 #if FF_API_DESTRUCT_PACKET
3732 /**
3733  * Default packet destructor.
3734  * @deprecated use the AVBuffer API instead
3735  */
3738 #endif
3739 
3740 /**
3741  * Initialize optional fields of a packet with default values.
3742  *
3743  * Note, this does not touch the data and size members, which have to be
3744  * initialized separately.
3745  *
3746  * @param pkt packet
3747  */
3748 void av_init_packet(AVPacket *pkt);
3749 
3750 /**
3751  * Allocate the payload of a packet and initialize its fields with
3752  * default values.
3753  *
3754  * @param pkt packet
3755  * @param size wanted payload size
3756  * @return 0 if OK, AVERROR_xxx otherwise
3757  */
3758 int av_new_packet(AVPacket *pkt, int size);
3759 
3760 /**
3761  * Reduce packet size, correctly zeroing padding
3762  *
3763  * @param pkt packet
3764  * @param size new size
3765  */
3766 void av_shrink_packet(AVPacket *pkt, int size);
3767 
3768 /**
3769  * Increase packet size, correctly zeroing padding
3770  *
3771  * @param pkt packet
3772  * @param grow_by number of bytes by which to increase the size of the packet
3773  */
3774 int av_grow_packet(AVPacket *pkt, int grow_by);
3775 
3776 /**
3777  * Initialize a reference-counted packet from av_malloc()ed data.
3778  *
3779  * @param pkt packet to be initialized. This function will set the data, size,
3780  * buf and destruct fields, all others are left untouched.
3781  * @param data Data allocated by av_malloc() to be used as packet data. If this
3782  * function returns successfully, the data is owned by the underlying AVBuffer.
3783  * The caller may not access the data through other means.
3784  * @param size size of data in bytes, without the padding. I.e. the full buffer
3785  * size is assumed to be size + FF_INPUT_BUFFER_PADDING_SIZE.
3786  *
3787  * @return 0 on success, a negative AVERROR on error
3788  */
3790 
3791 /**
3792  * @warning This is a hack - the packet memory allocation stuff is broken. The
3793  * packet is allocated if it was not really allocated.
3794  */
3795 int av_dup_packet(AVPacket *pkt);
3796 
3797 /**
3798  * Copy packet, including contents
3799  *
3800  * @return 0 on success, negative AVERROR on fail
3801  */
3802 int av_copy_packet(AVPacket *dst, const AVPacket *src);
3803 
3804 /**
3805  * Copy packet side data
3806  *
3807  * @return 0 on success, negative AVERROR on fail
3808  */
3809 int av_copy_packet_side_data(AVPacket *dst, const AVPacket *src);
3810 
3811 /**
3812  * Free a packet.
3813  *
3814  * @param pkt packet to free
3815  */
3816 void av_free_packet(AVPacket *pkt);
3817 
3818 /**
3819  * Allocate new information of a packet.
3820  *
3821  * @param pkt packet
3822  * @param type side information type
3823  * @param size side information size
3824  * @return pointer to fresh allocated data or NULL otherwise
3825  */
3827  int size);
3828 
3829 /**
3830  * Shrink the already allocated side data buffer
3831  *
3832  * @param pkt packet
3833  * @param type side information type
3834  * @param size new side information size
3835  * @return 0 on success, < 0 on failure
3836  */
3838  int size);
3839 
3840 /**
3841  * Get side information from packet.
3842  *
3843  * @param pkt packet
3844  * @param type desired side information type
3845  * @param size pointer for side information size to store (optional)
3846  * @return pointer to data if present or NULL otherwise
3847  */
3849  int *size);
3850 
3852 
3854 
3856 
3857 /**
3858  * Pack a dictionary for use in side_data.
3859  *
3860  * @param dict The dictionary to pack.
3861  * @param size pointer to store the size of the returned data
3862  * @return pointer to data if successful, NULL otherwise
3863  */
3865 /**
3866  * Unpack a dictionary from side_data.
3867  *
3868  * @param data data from side_data
3869  * @param size size of the data
3870  * @param dict the metadata storage dictionary
3871  * @return 0 on success, < 0 on failure
3872  */
3873 int av_packet_unpack_dictionary(const uint8_t *data, int size, AVDictionary **dict);
3874 
3875 
3876 /**
3877  * Convenience function to free all the side data stored.
3878  * All the other fields stay untouched.
3879  *
3880  * @param pkt packet
3881  */
3883 
3884 /**
3885  * Setup a new reference to the data described by a given packet
3886  *
3887  * If src is reference-counted, setup dst as a new reference to the
3888  * buffer in src. Otherwise allocate a new buffer in dst and copy the
3889  * data from src into it.
3890  *
3891  * All the other fields are copied from src.
3892  *
3893  * @see av_packet_unref
3894  *
3895  * @param dst Destination packet
3896  * @param src Source packet
3897  *
3898  * @return 0 on success, a negative AVERROR on error.
3899  */
3900 int av_packet_ref(AVPacket *dst, const AVPacket *src);
3901 
3902 /**
3903  * Wipe the packet.
3904  *
3905  * Unreference the buffer referenced by the packet and reset the
3906  * remaining packet fields to their default values.
3907  *
3908  * @param pkt The packet to be unreferenced.
3909  */
3911 
3912 /**
3913  * Move every field in src to dst and reset src.
3914  *
3915  * @see av_packet_unref
3916  *
3917  * @param src Source packet, will be reset
3918  * @param dst Destination packet
3919  */
3921 
3922 /**
3923  * Copy only "properties" fields from src to dst.
3924  *
3925  * Properties for the purpose of this function are all the fields
3926  * beside those related to the packet data (buf, data, size)
3927  *
3928  * @param dst Destination packet
3929  * @param src Source packet
3930  *
3931  * @return 0 on success AVERROR on failure.
3932  *
3933  */
3934 int av_packet_copy_props(AVPacket *dst, const AVPacket *src);
3935 
3936 /**
3937  * Convert valid timing fields (timestamps / durations) in a packet from one
3938  * timebase to another. Timestamps with unknown values (AV_NOPTS_VALUE) will be
3939  * ignored.
3940  *
3941  * @param pkt packet on which the conversion will be performed
3942  * @param tb_src source timebase, in which the timing fields in pkt are
3943  * expressed
3944  * @param tb_dst destination timebase, to which the timing fields will be
3945  * converted
3946  */
3947 void av_packet_rescale_ts(AVPacket *pkt, AVRational tb_src, AVRational tb_dst);
3948 
3949 /**
3950  * @}
3951  */
3952 
3953 /**
3954  * @addtogroup lavc_decoding
3955  * @{
3956  */
3957 
3958 /**
3959  * Find a registered decoder with a matching codec ID.
3960  *
3961  * @param id AVCodecID of the requested decoder
3962  * @return A decoder if one was found, NULL otherwise.
3963  */
3965 
3966 /**
3967  * Find a registered decoder with the specified name.
3968  *
3969  * @param name name of the requested decoder
3970  * @return A decoder if one was found, NULL otherwise.
3971  */
3973 
3974 #if FF_API_GET_BUFFER
3978 #endif
3979 
3980 /**
3981  * The default callback for AVCodecContext.get_buffer2(). It is made public so
3982  * it can be called by custom get_buffer2() implementations for decoders without
3983  * CODEC_CAP_DR1 set.
3984  */
3986 
3987 #if FF_API_EMU_EDGE
3988 /**
3989  * Return the amount of padding in pixels which the get_buffer callback must
3990  * provide around the edge of the image for codecs which do not have the
3991  * CODEC_FLAG_EMU_EDGE flag.
3992  *
3993  * @return Required padding in pixels.
3994  *
3995  * @deprecated CODEC_FLAG_EMU_EDGE is deprecated, so this function is no longer
3996  * needed
3997  */
3999 unsigned avcodec_get_edge_width(void);
4000 #endif
4001 
4002 /**
4003  * Modify width and height values so that they will result in a memory
4004  * buffer that is acceptable for the codec if you do not use any horizontal
4005  * padding.
4006  *
4007  * May only be used if a codec with CODEC_CAP_DR1 has been opened.
4008  */
4010 
4011 /**
4012  * Modify width and height values so that they will result in a memory
4013  * buffer that is acceptable for the codec if you also ensure that all
4014  * line sizes are a multiple of the respective linesize_align[i].
4015  *
4016  * May only be used if a codec with CODEC_CAP_DR1 has been opened.
4017  */
4019  int linesize_align[AV_NUM_DATA_POINTERS]);
4020 
4021 /**
4022  * Converts AVChromaLocation to swscale x/y chroma position.
4023  *
4024  * The positions represent the chroma (0,0) position in a coordinates system
4025  * with luma (0,0) representing the origin and luma(1,1) representing 256,256
4026  *
4027  * @param xpos horizontal chroma sample position
4028  * @param ypos vertical chroma sample position
4029  */
4030 int avcodec_enum_to_chroma_pos(int *xpos, int *ypos, enum AVChromaLocation pos);
4031 
4032 /**
4033  * Converts swscale x/y chroma position to AVChromaLocation.
4034  *
4035  * The positions represent the chroma (0,0) position in a coordinates system
4036  * with luma (0,0) representing the origin and luma(1,1) representing 256,256
4037  *
4038  * @param xpos horizontal chroma sample position
4039  * @param ypos vertical chroma sample position
4040  */
4041 enum AVChromaLocation avcodec_chroma_pos_to_enum(int xpos, int ypos);
4042 
4043 #if FF_API_OLD_DECODE_AUDIO
4044 /**
4045  * Wrapper function which calls avcodec_decode_audio4.
4046  *
4047  * @deprecated Use avcodec_decode_audio4 instead.
4048  *
4049  * Decode the audio frame of size avpkt->size from avpkt->data into samples.
4050  * Some decoders may support multiple frames in a single AVPacket, such
4051  * decoders would then just decode the first frame. In this case,
4052  * avcodec_decode_audio3 has to be called again with an AVPacket that contains
4053  * the remaining data in order to decode the second frame etc.
4054  * If no frame
4055  * could be outputted, frame_size_ptr is zero. Otherwise, it is the
4056  * decompressed frame size in bytes.
4057  *
4058  * @warning You must set frame_size_ptr to the allocated size of the
4059  * output buffer before calling avcodec_decode_audio3().
4060  *
4061  * @warning The input buffer must be FF_INPUT_BUFFER_PADDING_SIZE larger than
4062  * the actual read bytes because some optimized bitstream readers read 32 or 64
4063  * bits at once and could read over the end.
4064  *
4065  * @warning The end of the input buffer avpkt->data should be set to 0 to ensure that
4066  * no overreading happens for damaged MPEG streams.
4067  *
4068  * @warning You must not provide a custom get_buffer() when using
4069  * avcodec_decode_audio3(). Doing so will override it with
4070  * avcodec_default_get_buffer. Use avcodec_decode_audio4() instead,
4071  * which does allow the application to provide a custom get_buffer().
4072  *
4073  * @note You might have to align the input buffer avpkt->data and output buffer
4074  * samples. The alignment requirements depend on the CPU: On some CPUs it isn't
4075  * necessary at all, on others it won't work at all if not aligned and on others
4076  * it will work but it will have an impact on performance.
4077  *
4078  * In practice, avpkt->data should have 4 byte alignment at minimum and
4079  * samples should be 16 byte aligned unless the CPU doesn't need it
4080  * (AltiVec and SSE do).
4081  *
4082  * @note Codecs which have the CODEC_CAP_DELAY capability set have a delay
4083  * between input and output, these need to be fed with avpkt->data=NULL,
4084  * avpkt->size=0 at the end to return the remaining frames.
4085  *
4086  * @param avctx the codec context
4087  * @param[out] samples the output buffer, sample type in avctx->sample_fmt
4088  * If the sample format is planar, each channel plane will
4089  * be the same size, with no padding between channels.
4090  * @param[in,out] frame_size_ptr the output buffer size in bytes
4091  * @param[in] avpkt The input AVPacket containing the input buffer.
4092  * You can create such packet with av_init_packet() and by then setting
4093  * data and size, some decoders might in addition need other fields.
4094  * All decoders are designed to use the least fields possible though.
4095  * @return On error a negative value is returned, otherwise the number of bytes
4096  * used or zero if no frame data was decompressed (used) from the input AVPacket.
4097  */
4098 attribute_deprecated int avcodec_decode_audio3(AVCodecContext *avctx, int16_t *samples,
4099  int *frame_size_ptr,
4100  AVPacket *avpkt);
4101 #endif
4102 
4103 /**
4104  * Decode the audio frame of size avpkt->size from avpkt->data into frame.
4105  *
4106  * Some decoders may support multiple frames in a single AVPacket. Such
4107  * decoders would then just decode the first frame and the return value would be
4108  * less than the packet size. In this case, avcodec_decode_audio4 has to be
4109  * called again with an AVPacket containing the remaining data in order to
4110  * decode the second frame, etc... Even if no frames are returned, the packet
4111  * needs to be fed to the decoder with remaining data until it is completely
4112  * consumed or an error occurs.
4113  *
4114  * Some decoders (those marked with CODEC_CAP_DELAY) have a delay between input
4115  * and output. This means that for some packets they will not immediately
4116  * produce decoded output and need to be flushed at the end of decoding to get
4117  * all the decoded data. Flushing is done by calling this function with packets
4118  * with avpkt->data set to NULL and avpkt->size set to 0 until it stops
4119  * returning samples. It is safe to flush even those decoders that are not
4120  * marked with CODEC_CAP_DELAY, then no samples will be returned.
4121  *
4122  * @warning The input buffer, avpkt->data must be FF_INPUT_BUFFER_PADDING_SIZE
4123  * larger than the actual read bytes because some optimized bitstream
4124  * readers read 32 or 64 bits at once and could read over the end.
4125  *
4126  * @note The AVCodecContext MUST have been opened with @ref avcodec_open2()
4127  * before packets may be fed to the decoder.
4128  *
4129  * @param avctx the codec context
4130  * @param[out] frame The AVFrame in which to store decoded audio samples.
4131  * The decoder will allocate a buffer for the decoded frame by
4132  * calling the AVCodecContext.get_buffer2() callback.
4133  * When AVCodecContext.refcounted_frames is set to 1, the frame is
4134  * reference counted and the returned reference belongs to the
4135  * caller. The caller must release the frame using av_frame_unref()
4136  * when the frame is no longer needed. The caller may safely write
4137  * to the frame if av_frame_is_writable() returns 1.
4138  * When AVCodecContext.refcounted_frames is set to 0, the returned
4139  * reference belongs to the decoder and is valid only until the
4140  * next call to this function or until closing or flushing the
4141  * decoder. The caller may not write to it.
4142  * @param[out] got_frame_ptr Zero if no frame could be decoded, otherwise it is
4143  * non-zero. Note that this field being set to zero
4144  * does not mean that an error has occurred. For
4145  * decoders with CODEC_CAP_DELAY set, no given decode
4146  * call is guaranteed to produce a frame.
4147  * @param[in] avpkt The input AVPacket containing the input buffer.
4148  * At least avpkt->data and avpkt->size should be set. Some
4149  * decoders might also require additional fields to be set.
4150  * @return A negative error code is returned if an error occurred during
4151  * decoding, otherwise the number of bytes consumed from the input
4152  * AVPacket is returned.
4153  */
4155  int *got_frame_ptr, const AVPacket *avpkt);
4156 
4157 /**
4158  * Decode the video frame of size avpkt->size from avpkt->data into picture.
4159  * Some decoders may support multiple frames in a single AVPacket, such
4160  * decoders would then just decode the first frame.
4161  *
4162  * @warning The input buffer must be FF_INPUT_BUFFER_PADDING_SIZE larger than
4163  * the actual read bytes because some optimized bitstream readers read 32 or 64
4164  * bits at once and could read over the end.
4165  *
4166  * @warning The end of the input buffer buf should be set to 0 to ensure that
4167  * no overreading happens for damaged MPEG streams.
4168  *
4169  * @note Codecs which have the CODEC_CAP_DELAY capability set have a delay
4170  * between input and output, these need to be fed with avpkt->data=NULL,
4171  * avpkt->size=0 at the end to return the remaining frames.
4172  *
4173  * @note The AVCodecContext MUST have been opened with @ref avcodec_open2()
4174  * before packets may be fed to the decoder.
4175  *
4176  * @param avctx the codec context
4177  * @param[out] picture The AVFrame in which the decoded video frame will be stored.
4178  * Use av_frame_alloc() to get an AVFrame. The codec will
4179  * allocate memory for the actual bitmap by calling the
4180  * AVCodecContext.get_buffer2() callback.
4181  * When AVCodecContext.refcounted_frames is set to 1, the frame is
4182  * reference counted and the returned reference belongs to the
4183  * caller. The caller must release the frame using av_frame_unref()
4184  * when the frame is no longer needed. The caller may safely write
4185  * to the frame if av_frame_is_writable() returns 1.
4186  * When AVCodecContext.refcounted_frames is set to 0, the returned
4187  * reference belongs to the decoder and is valid only until the
4188  * next call to this function or until closing or flushing the
4189  * decoder. The caller may not write to it.
4190  *
4191  * @param[in] avpkt The input AVPacket containing the input buffer.
4192  * You can create such packet with av_init_packet() and by then setting
4193  * data and size, some decoders might in addition need other fields like
4194  * flags&AV_PKT_FLAG_KEY. All decoders are designed to use the least
4195  * fields possible.
4196  * @param[in,out] got_picture_ptr Zero if no frame could be decompressed, otherwise, it is nonzero.
4197  * @return On error a negative value is returned, otherwise the number of bytes
4198  * used or zero if no frame could be decompressed.
4199  */
4200 int avcodec_decode_video2(AVCodecContext *avctx, AVFrame *picture,
4201  int *got_picture_ptr,
4202  const AVPacket *avpkt);
4203 
4204 /**
4205  * Decode a subtitle message.
4206  * Return a negative value on error, otherwise return the number of bytes used.
4207  * If no subtitle could be decompressed, got_sub_ptr is zero.
4208  * Otherwise, the subtitle is stored in *sub.
4209  * Note that CODEC_CAP_DR1 is not available for subtitle codecs. This is for
4210  * simplicity, because the performance difference is expect to be negligible
4211  * and reusing a get_buffer written for video codecs would probably perform badly
4212  * due to a potentially very different allocation pattern.
4213  *
4214  * Some decoders (those marked with CODEC_CAP_DELAY) have a delay between input
4215  * and output. This means that for some packets they will not immediately
4216  * produce decoded output and need to be flushed at the end of decoding to get
4217  * all the decoded data. Flushing is done by calling this function with packets
4218  * with avpkt->data set to NULL and avpkt->size set to 0 until it stops
4219  * returning subtitles. It is safe to flush even those decoders that are not
4220  * marked with CODEC_CAP_DELAY, then no subtitles will be returned.
4221  *
4222  * @note The AVCodecContext MUST have been opened with @ref avcodec_open2()
4223  * before packets may be fed to the decoder.
4224  *
4225  * @param avctx the codec context
4226  * @param[out] sub The Preallocated AVSubtitle in which the decoded subtitle will be stored,
4227  * must be freed with avsubtitle_free if *got_sub_ptr is set.
4228  * @param[in,out] got_sub_ptr Zero if no subtitle could be decompressed, otherwise, it is nonzero.
4229  * @param[in] avpkt The input AVPacket containing the input buffer.
4230  */
4232  int *got_sub_ptr,
4233  AVPacket *avpkt);
4234 
4235 /**
4236  * @defgroup lavc_parsing Frame parsing
4237  * @{
4238  */
4239 
4242  AV_PICTURE_STRUCTURE_TOP_FIELD, //< coded as top field
4243  AV_PICTURE_STRUCTURE_BOTTOM_FIELD, //< coded as bottom field
4244  AV_PICTURE_STRUCTURE_FRAME, //< coded as frame
4245 };
4246 
4247 typedef struct AVCodecParserContext {
4248  void *priv_data;
4250  int64_t frame_offset; /* offset of the current frame */
4251  int64_t cur_offset; /* current offset
4252  (incremented by each av_parser_parse()) */
4253  int64_t next_frame_offset; /* offset of the next frame */
4254  /* video info */
4255  int pict_type; /* XXX: Put it back in AVCodecContext. */
4256  /**
4257  * This field is used for proper frame duration computation in lavf.
4258  * It signals, how much longer the frame duration of the current frame
4259  * is compared to normal frame duration.
4260  *
4261  * frame_duration = (1 + repeat_pict) * time_base
4262  *
4263  * It is used by codecs like H.264 to display telecined material.
4264  */
4265  int repeat_pict; /* XXX: Put it back in AVCodecContext. */
4266  int64_t pts; /* pts of the current frame */
4267  int64_t dts; /* dts of the current frame */
4268 
4269  /* private data */
4270  int64_t last_pts;
4271  int64_t last_dts;
4273 
4274 #define AV_PARSER_PTS_NB 4
4279 
4280  int flags;
4281 #define PARSER_FLAG_COMPLETE_FRAMES 0x0001
4282 #define PARSER_FLAG_ONCE 0x0002
4283 /// Set if the parser has a valid file offset
4284 #define PARSER_FLAG_FETCHED_OFFSET 0x0004
4285 #define PARSER_FLAG_USE_CODEC_TS 0x1000
4286 
4287  int64_t offset; ///< byte offset from starting packet start
4289 
4290  /**
4291  * Set by parser to 1 for key frames and 0 for non-key frames.
4292  * It is initialized to -1, so if the parser doesn't set this flag,
4293  * old-style fallback using AV_PICTURE_TYPE_I picture type as key frames
4294  * will be used.
4295  */
4297 
4298  /**
4299  * Time difference in stream time base units from the pts of this
4300  * packet to the point at which the output from the decoder has converged
4301  * independent from the availability of previous frames. That is, the
4302  * frames are virtually identical no matter if decoding started from
4303  * the very first frame or from this keyframe.
4304  * Is AV_NOPTS_VALUE if unknown.
4305  * This field is not the display duration of the current frame.
4306  * This field has no meaning if the packet does not have AV_PKT_FLAG_KEY
4307  * set.
4308  *
4309  * The purpose of this field is to allow seeking in streams that have no
4310  * keyframes in the conventional sense. It corresponds to the
4311  * recovery point SEI in H.264 and match_time_delta in NUT. It is also
4312  * essential for some types of subtitle streams to ensure that all
4313  * subtitles are correctly displayed after seeking.
4314  */
4316 
4317  // Timestamp generation support:
4318  /**
4319  * Synchronization point for start of timestamp generation.
4320  *
4321  * Set to >0 for sync point, 0 for no sync point and <0 for undefined
4322  * (default).
4323  *
4324  * For example, this corresponds to presence of H.264 buffering period
4325  * SEI message.
4326  */
4328 
4329  /**
4330  * Offset of the current timestamp against last timestamp sync point in
4331  * units of AVCodecContext.time_base.
4332  *
4333  * Set to INT_MIN when dts_sync_point unused. Otherwise, it must
4334  * contain a valid timestamp offset.
4335  *
4336  * Note that the timestamp of sync point has usually a nonzero
4337  * dts_ref_dts_delta, which refers to the previous sync point. Offset of
4338  * the next frame after timestamp sync point will be usually 1.
4339  *
4340  * For example, this corresponds to H.264 cpb_removal_delay.
4341  */
4343 
4344  /**
4345  * Presentation delay of current frame in units of AVCodecContext.time_base.
4346  *
4347  * Set to INT_MIN when dts_sync_point unused. Otherwise, it must
4348  * contain valid non-negative timestamp delta (presentation time of a frame
4349  * must not lie in the past).
4350  *
4351  * This delay represents the difference between decoding and presentation
4352  * time of the frame.
4353  *
4354  * For example, this corresponds to H.264 dpb_output_delay.
4355  */
4357 
4358  /**
4359  * Position of the packet in file.
4360  *
4361  * Analogous to cur_frame_pts/dts
4362  */
4364 
4365  /**
4366  * Byte position of currently parsed frame in stream.
4367  */
4368  int64_t pos;
4369 
4370  /**
4371  * Previous frame byte position.
4372  */
4373  int64_t last_pos;
4374 
4375  /**
4376  * Duration of the current frame.
4377  * For audio, this is in units of 1 / AVCodecContext.sample_rate.
4378  * For all other types, this is in units of AVCodecContext.time_base.
4379  */
4381 
4383 
4384  /**
4385  * Indicate whether a picture is coded as a frame, top field or bottom field.
4386  *
4387  * For example, H.264 field_pic_flag equal to 0 corresponds to
4388  * AV_PICTURE_STRUCTURE_FRAME. An H.264 picture with field_pic_flag
4389  * equal to 1 and bottom_field_flag equal to 0 corresponds to
4390  * AV_PICTURE_STRUCTURE_TOP_FIELD.
4391  */
4393 
4394  /**
4395  * Picture number incremented in presentation or output order.
4396  * This field may be reinitialized at the first picture of a new sequence.
4397  *
4398  * For example, this corresponds to H.264 PicOrderCnt.
4399  */
4401 
4402  /**
4403  * Dimensions of the decoded video intended for presentation.
4404  */
4405  int width;
4406  int height;
4407 
4408  /**
4409  * Dimensions of the coded video.
4410  */
4413 
4414  /**
4415  * The format of the coded data, corresponds to enum AVPixelFormat for video
4416  * and for enum AVSampleFormat for audio.
4417  *
4418  * Note that a decoder can have considerable freedom in how exactly it
4419  * decodes the data, so the format reported here might be different from the
4420  * one returned by a decoder.
4421  */
4422  int format;
4424 
4425 typedef struct AVCodecParser {
4426  int codec_ids[5]; /* several codec IDs are permitted */
4429  /* This callback never returns an error, a negative value means that
4430  * the frame start was in a previous packet. */
4432  AVCodecContext *avctx,
4433  const uint8_t **poutbuf, int *poutbuf_size,
4434  const uint8_t *buf, int buf_size);
4436  int (*split)(AVCodecContext *avctx, const uint8_t *buf, int buf_size);
4438 } AVCodecParser;
4439 
4441 
4444 
4445 /**
4446  * Parse a packet.
4447  *
4448  * @param s parser context.
4449  * @param avctx codec context.
4450  * @param poutbuf set to pointer to parsed buffer or NULL if not yet finished.
4451  * @param poutbuf_size set to size of parsed buffer or zero if not yet finished.
4452  * @param buf input buffer.
4453  * @param buf_size input length, to signal EOF, this should be 0 (so that the last frame can be output).
4454  * @param pts input presentation timestamp.
4455  * @param dts input decoding timestamp.
4456  * @param pos input byte position in stream.
4457  * @return the number of bytes of the input bitstream used.
4458  *
4459  * Example:
4460  * @code
4461  * while(in_len){
4462  * len = av_parser_parse2(myparser, AVCodecContext, &data, &size,
4463  * in_data, in_len,
4464  * pts, dts, pos);
4465  * in_data += len;
4466  * in_len -= len;
4467  *
4468  * if(size)
4469  * decode_frame(data, size);
4470  * }
4471  * @endcode
4472  */
4474  AVCodecContext *avctx,
4475  uint8_t **poutbuf, int *poutbuf_size,
4476  const uint8_t *buf, int buf_size,
4477  int64_t pts, int64_t dts,
4478  int64_t pos);
4479 
4480 /**
4481  * @return 0 if the output buffer is a subset of the input, 1 if it is allocated and must be freed
4482  * @deprecated use AVBitStreamFilter
4483  */
4485  AVCodecContext *avctx,
4486  uint8_t **poutbuf, int *poutbuf_size,
4487  const uint8_t *buf, int buf_size, int keyframe);
4489 
4490 /**
4491  * @}
4492  * @}
4493  */
4494 
4495 /**
4496  * @addtogroup lavc_encoding
4497  * @{
4498  */
4499 
4500 /**
4501  * Find a registered encoder with a matching codec ID.
4502  *
4503  * @param id AVCodecID of the requested encoder
4504  * @return An encoder if one was found, NULL otherwise.
4505  */
4507 
4508 /**
4509  * Find a registered encoder with the specified name.
4510  *
4511  * @param name name of the requested encoder
4512  * @return An encoder if one was found, NULL otherwise.
4513  */
4515 
4516 #if FF_API_OLD_ENCODE_AUDIO
4517 /**
4518  * Encode an audio frame from samples into buf.
4519  *
4520  * @deprecated Use avcodec_encode_audio2 instead.
4521  *
4522  * @note The output buffer should be at least FF_MIN_BUFFER_SIZE bytes large.
4523  * However, for codecs with avctx->frame_size equal to 0 (e.g. PCM) the user
4524  * will know how much space is needed because it depends on the value passed
4525  * in buf_size as described below. In that case a lower value can be used.
4526  *
4527  * @param avctx the codec context
4528  * @param[out] buf the output buffer
4529  * @param[in] buf_size the output buffer size
4530  * @param[in] samples the input buffer containing the samples
4531  * The number of samples read from this buffer is frame_size*channels,
4532  * both of which are defined in avctx.
4533  * For codecs which have avctx->frame_size equal to 0 (e.g. PCM) the number of
4534  * samples read from samples is equal to:
4535  * buf_size * 8 / (avctx->channels * av_get_bits_per_sample(avctx->codec_id))
4536  * This also implies that av_get_bits_per_sample() must not return 0 for these
4537  * codecs.
4538  * @return On error a negative value is returned, on success zero or the number
4539  * of bytes used to encode the data read from the input buffer.
4540  */
4542  uint8_t *buf, int buf_size,
4543  const short *samples);
4544 #endif
4545 
4546 /**
4547  * Encode a frame of audio.
4548  *
4549  * Takes input samples from frame and writes the next output packet, if
4550  * available, to avpkt. The output packet does not necessarily contain data for
4551  * the most recent frame, as encoders can delay, split, and combine input frames
4552  * internally as needed.
4553  *
4554  * @param avctx codec context
4555  * @param avpkt output AVPacket.
4556  * The user can supply an output buffer by setting
4557  * avpkt->data and avpkt->size prior to calling the
4558  * function, but if the size of the user-provided data is not
4559  * large enough, encoding will fail. If avpkt->data and
4560  * avpkt->size are set, avpkt->destruct must also be set. All
4561  * other AVPacket fields will be reset by the encoder using
4562  * av_init_packet(). If avpkt->data is NULL, the encoder will
4563  * allocate it. The encoder will set avpkt->size to the size
4564  * of the output packet.
4565  *
4566  * If this function fails or produces no output, avpkt will be
4567  * freed using av_free_packet() (i.e. avpkt->destruct will be
4568  * called to free the user supplied buffer).
4569  * @param[in] frame AVFrame containing the raw audio data to be encoded.
4570  * May be NULL when flushing an encoder that has the
4571  * CODEC_CAP_DELAY capability set.
4572  * If CODEC_CAP_VARIABLE_FRAME_SIZE is set, then each frame
4573  * can have any number of samples.
4574  * If it is not set, frame->nb_samples must be equal to
4575  * avctx->frame_size for all frames except the last.
4576  * The final frame may be smaller than avctx->frame_size.
4577  * @param[out] got_packet_ptr This field is set to 1 by libavcodec if the
4578  * output packet is non-empty, and to 0 if it is
4579  * empty. If the function returns an error, the
4580  * packet can be assumed to be invalid, and the
4581  * value of got_packet_ptr is undefined and should
4582  * not be used.
4583  * @return 0 on success, negative error code on failure
4584  */
4585 int avcodec_encode_audio2(AVCodecContext *avctx, AVPacket *avpkt,
4586  const AVFrame *frame, int *got_packet_ptr);
4587 
4588 #if FF_API_OLD_ENCODE_VIDEO
4589 /**
4590  * @deprecated use avcodec_encode_video2() instead.
4591  *
4592  * Encode a video frame from pict into buf.
4593  * The input picture should be
4594  * stored using a specific format, namely avctx.pix_fmt.
4595  *
4596  * @param avctx the codec context
4597  * @param[out] buf the output buffer for the bitstream of encoded frame
4598  * @param[in] buf_size the size of the output buffer in bytes
4599  * @param[in] pict the input picture to encode
4600  * @return On error a negative value is returned, on success zero or the number
4601  * of bytes used from the output buffer.
4602  */
4604 int avcodec_encode_video(AVCodecContext *avctx, uint8_t *buf, int buf_size,
4605  const AVFrame *pict);
4606 #endif
4607 
4608 /**
4609  * Encode a frame of video.
4610  *
4611  * Takes input raw video data from frame and writes the next output packet, if
4612  * available, to avpkt. The output packet does not necessarily contain data for
4613  * the most recent frame, as encoders can delay and reorder input frames
4614  * internally as needed.
4615  *
4616  * @param avctx codec context
4617  * @param avpkt output AVPacket.
4618  * The user can supply an output buffer by setting
4619  * avpkt->data and avpkt->size prior to calling the
4620  * function, but if the size of the user-provided data is not
4621  * large enough, encoding will fail. All other AVPacket fields
4622  * will be reset by the encoder using av_init_packet(). If
4623  * avpkt->data is NULL, the encoder will allocate it.
4624  * The encoder will set avpkt->size to the size of the
4625  * output packet. The returned data (if any) belongs to the
4626  * caller, he is responsible for freeing it.
4627  *
4628  * If this function fails or produces no output, avpkt will be
4629  * freed using av_free_packet() (i.e. avpkt->destruct will be
4630  * called to free the user supplied buffer).
4631  * @param[in] frame AVFrame containing the raw video data to be encoded.
4632  * May be NULL when flushing an encoder that has the
4633  * CODEC_CAP_DELAY capability set.
4634  * @param[out] got_packet_ptr This field is set to 1 by libavcodec if the
4635  * output packet is non-empty, and to 0 if it is
4636  * empty. If the function returns an error, the
4637  * packet can be assumed to be invalid, and the
4638  * value of got_packet_ptr is undefined and should
4639  * not be used.
4640  * @return 0 on success, negative error code on failure
4641  */
4642 int avcodec_encode_video2(AVCodecContext *avctx, AVPacket *avpkt,
4643  const AVFrame *frame, int *got_packet_ptr);
4644 
4645 int avcodec_encode_subtitle(AVCodecContext *avctx, uint8_t *buf, int buf_size,
4646  const AVSubtitle *sub);
4647 
4648 
4649 /**
4650  * @}
4651  */
4652 
4653 #if FF_API_AVCODEC_RESAMPLE
4654 /**
4655  * @defgroup lavc_resample Audio resampling
4656  * @ingroup libavc
4657  * @deprecated use libswresample instead
4658  *
4659  * @{
4660  */
4661 struct ReSampleContext;
4662 struct AVResampleContext;
4663 
4664 typedef struct ReSampleContext ReSampleContext;
4665 
4666 /**
4667  * Initialize audio resampling context.
4668  *
4669  * @param output_channels number of output channels
4670  * @param input_channels number of input channels
4671  * @param output_rate output sample rate
4672  * @param input_rate input sample rate
4673  * @param sample_fmt_out requested output sample format
4674  * @param sample_fmt_in input sample format
4675  * @param filter_length length of each FIR filter in the filterbank relative to the cutoff frequency
4676  * @param log2_phase_count log2 of the number of entries in the polyphase filterbank
4677  * @param linear if 1 then the used FIR filter will be linearly interpolated
4678  between the 2 closest, if 0 the closest will be used
4679  * @param cutoff cutoff frequency, 1.0 corresponds to half the output sampling rate
4680  * @return allocated ReSampleContext, NULL if error occurred
4681  */
4684  int output_rate, int input_rate,
4685  enum AVSampleFormat sample_fmt_out,
4686  enum AVSampleFormat sample_fmt_in,
4687  int filter_length, int log2_phase_count,
4688  int linear, double cutoff);
4689 
4691 int audio_resample(ReSampleContext *s, short *output, short *input, int nb_samples);
4692 
4693 /**
4694  * Free resample context.
4695  *
4696  * @param s a non-NULL pointer to a resample context previously
4697  * created with av_audio_resample_init()
4698  */
4701 
4702 
4703 /**
4704  * Initialize an audio resampler.
4705  * Note, if either rate is not an integer then simply scale both rates up so they are.
4706  * @param filter_length length of each FIR filter in the filterbank relative to the cutoff freq
4707  * @param log2_phase_count log2 of the number of entries in the polyphase filterbank
4708  * @param linear If 1 then the used FIR filter will be linearly interpolated
4709  between the 2 closest, if 0 the closest will be used
4710  * @param cutoff cutoff frequency, 1.0 corresponds to half the output sampling rate
4711  */
4713 struct AVResampleContext *av_resample_init(int out_rate, int in_rate, int filter_length, int log2_phase_count, int linear, double cutoff);
4714 
4715 /**
4716  * Resample an array of samples using a previously configured context.
4717  * @param src an array of unconsumed samples
4718  * @param consumed the number of samples of src which have been consumed are returned here
4719  * @param src_size the number of unconsumed samples available
4720  * @param dst_size the amount of space in samples available in dst
4721  * @param update_ctx If this is 0 then the context will not be modified, that way several channels can be resampled with the same context.
4722  * @return the number of samples written in dst or -1 if an error occurred
4723  */
4725 int av_resample(struct AVResampleContext *c, short *dst, short *src, int *consumed, int src_size, int dst_size, int update_ctx);
4726 
4727 
4728 /**
4729  * Compensate samplerate/timestamp drift. The compensation is done by changing
4730  * the resampler parameters, so no audible clicks or similar distortions occur
4731  * @param compensation_distance distance in output samples over which the compensation should be performed
4732  * @param sample_delta number of output samples which should be output less
4733  *
4734  * example: av_resample_compensate(c, 10, 500)
4735  * here instead of 510 samples only 500 samples would be output
4736  *
4737  * note, due to rounding the actual compensation might be slightly different,
4738  * especially if the compensation_distance is large and the in_rate used during init is small
4739  */
4741 void av_resample_compensate(struct AVResampleContext *c, int sample_delta, int compensation_distance);
4743 void av_resample_close(struct AVResampleContext *c);
4744 
4745 /**
4746  * @}
4747  */
4748 #endif
4749 
4750 /**
4751  * @addtogroup lavc_picture
4752  * @{
4753  */
4754 
4755 /**
4756  * Allocate memory for the pixels of a picture and setup the AVPicture
4757  * fields for it.
4758  *
4759  * Call avpicture_free() to free it.
4760  *
4761  * @param picture the picture structure to be filled in
4762  * @param pix_fmt the pixel format of the picture
4763  * @param width the width of the picture
4764  * @param height the height of the picture
4765  * @return zero if successful, a negative error code otherwise
4766  *
4767  * @see av_image_alloc(), avpicture_fill()
4768  */
4769 int avpicture_alloc(AVPicture *picture, enum AVPixelFormat pix_fmt, int width, int height);
4770 
4771 /**
4772  * Free a picture previously allocated by avpicture_alloc().
4773  * The data buffer used by the AVPicture is freed, but the AVPicture structure
4774  * itself is not.
4775  *
4776  * @param picture the AVPicture to be freed
4777  */
4778 void avpicture_free(AVPicture *picture);
4779 
4780 /**
4781  * Setup the picture fields based on the specified image parameters
4782  * and the provided image data buffer.
4783  *
4784  * The picture fields are filled in by using the image data buffer
4785  * pointed to by ptr.
4786  *
4787  * If ptr is NULL, the function will fill only the picture linesize
4788  * array and return the required size for the image buffer.
4789  *
4790  * To allocate an image buffer and fill the picture data in one call,
4791  * use avpicture_alloc().
4792  *
4793  * @param picture the picture to be filled in
4794  * @param ptr buffer where the image data is stored, or NULL
4795  * @param pix_fmt the pixel format of the image
4796  * @param width the width of the image in pixels
4797  * @param height the height of the image in pixels
4798  * @return the size in bytes required for src, a negative error code
4799  * in case of failure
4800  *
4801  * @see av_image_fill_arrays()
4802  */
4803 int avpicture_fill(AVPicture *picture, const uint8_t *ptr,
4804  enum AVPixelFormat pix_fmt, int width, int height);
4805 
4806 /**
4807  * Copy pixel data from an AVPicture into a buffer.
4808  *
4809  * avpicture_get_size() can be used to compute the required size for
4810  * the buffer to fill.
4811  *
4812  * @param src source picture with filled data
4813  * @param pix_fmt picture pixel format
4814  * @param width picture width
4815  * @param height picture height
4816  * @param dest destination buffer
4817  * @param dest_size destination buffer size in bytes
4818  * @return the number of bytes written to dest, or a negative value
4819  * (error code) on error, for example if the destination buffer is not
4820  * big enough
4821  *
4822  * @see av_image_copy_to_buffer()
4823  */
4825  int width, int height,
4826  unsigned char *dest, int dest_size);
4827 
4828 /**
4829  * Calculate the size in bytes that a picture of the given width and height
4830  * would occupy if stored in the given picture format.
4831  *
4832  * @param pix_fmt picture pixel format
4833  * @param width picture width
4834  * @param height picture height
4835  * @return the computed picture buffer size or a negative error code
4836  * in case of error
4837  *
4838  * @see av_image_get_buffer_size().
4839  */
4841 
4842 #if FF_API_DEINTERLACE
4843 /**
4844  * deinterlace - if not supported return -1
4845  *
4846  * @deprecated - use yadif (in libavfilter) instead
4847  */
4849 int avpicture_deinterlace(AVPicture *dst, const AVPicture *src,
4850  enum AVPixelFormat pix_fmt, int width, int height);
4851 #endif
4852 /**
4853  * Copy image src to dst. Wraps av_image_copy().
4854  */
4855 void av_picture_copy(AVPicture *dst, const AVPicture *src,
4856  enum AVPixelFormat pix_fmt, int width, int height);
4857 
4858 /**
4859  * Crop image top and left side.
4860  */
4861 int av_picture_crop(AVPicture *dst, const AVPicture *src,
4862  enum AVPixelFormat pix_fmt, int top_band, int left_band);
4863 
4864 /**
4865  * Pad image.
4866  */
4867 int av_picture_pad(AVPicture *dst, const AVPicture *src, int height, int width, enum AVPixelFormat pix_fmt,
4868  int padtop, int padbottom, int padleft, int padright, int *color);
4869 
4870 /**
4871  * @}
4872  */
4873 
4874 /**
4875  * @defgroup lavc_misc Utility functions
4876  * @ingroup libavc
4877  *
4878  * Miscellaneous utility functions related to both encoding and decoding
4879  * (or neither).
4880  * @{
4881  */
4882 
4883 /**
4884  * @defgroup lavc_misc_pixfmt Pixel formats
4885  *
4886  * Functions for working with pixel formats.
4887  * @{
4888  */
4889 
4890 /**
4891  * Utility function to access log2_chroma_w log2_chroma_h from
4892  * the pixel format AVPixFmtDescriptor.
4893  *
4894  * This function asserts that pix_fmt is valid. See av_pix_fmt_get_chroma_sub_sample
4895  * for one that returns a failure code and continues in case of invalid
4896  * pix_fmts.
4897  *
4898  * @param[in] pix_fmt the pixel format
4899  * @param[out] h_shift store log2_chroma_w
4900  * @param[out] v_shift store log2_chroma_h
4901  *
4902  * @see av_pix_fmt_get_chroma_sub_sample
4903  */
4904 
4905 void avcodec_get_chroma_sub_sample(enum AVPixelFormat pix_fmt, int *h_shift, int *v_shift);
4906 
4907 /**
4908  * Return a value representing the fourCC code associated to the
4909  * pixel format pix_fmt, or 0 if no associated fourCC code can be
4910  * found.
4911  */
4913 
4914 /**
4915  * @deprecated see av_get_pix_fmt_loss()
4916  */
4917 int avcodec_get_pix_fmt_loss(enum AVPixelFormat dst_pix_fmt, enum AVPixelFormat src_pix_fmt,
4918  int has_alpha);
4919 
4920 /**
4921  * Find the best pixel format to convert to given a certain source pixel
4922  * format. When converting from one pixel format to another, information loss
4923  * may occur. For example, when converting from RGB24 to GRAY, the color
4924  * information will be lost. Similarly, other losses occur when converting from
4925  * some formats to other formats. avcodec_find_best_pix_fmt_of_2() searches which of
4926  * the given pixel formats should be used to suffer the least amount of loss.
4927  * The pixel formats from which it chooses one, are determined by the
4928  * pix_fmt_list parameter.
4929  *
4930  *
4931  * @param[in] pix_fmt_list AV_PIX_FMT_NONE terminated array of pixel formats to choose from
4932  * @param[in] src_pix_fmt source pixel format
4933  * @param[in] has_alpha Whether the source pixel format alpha channel is used.
4934  * @param[out] loss_ptr Combination of flags informing you what kind of losses will occur.
4935  * @return The best pixel format to convert to or -1 if none was found.
4936  */
4937 enum AVPixelFormat avcodec_find_best_pix_fmt_of_list(const enum AVPixelFormat *pix_fmt_list,
4938  enum AVPixelFormat src_pix_fmt,
4939  int has_alpha, int *loss_ptr);
4940 
4941 /**
4942  * @deprecated see av_find_best_pix_fmt_of_2()
4943  */
4944 enum AVPixelFormat avcodec_find_best_pix_fmt_of_2(enum AVPixelFormat dst_pix_fmt1, enum AVPixelFormat dst_pix_fmt2,
4945  enum AVPixelFormat src_pix_fmt, int has_alpha, int *loss_ptr);
4946 
4948 #if AV_HAVE_INCOMPATIBLE_LIBAV_ABI
4949 enum AVPixelFormat avcodec_find_best_pix_fmt2(const enum AVPixelFormat *pix_fmt_list,
4950  enum AVPixelFormat src_pix_fmt,
4951  int has_alpha, int *loss_ptr);
4952 #else
4953 enum AVPixelFormat avcodec_find_best_pix_fmt2(enum AVPixelFormat dst_pix_fmt1, enum AVPixelFormat dst_pix_fmt2,
4954  enum AVPixelFormat src_pix_fmt, int has_alpha, int *loss_ptr);
4955 #endif
4956 
4957 
4959 
4960 /**
4961  * @}
4962  */
4963 
4964 #if FF_API_SET_DIMENSIONS
4965 /**
4966  * @deprecated this function is not supposed to be used from outside of lavc
4967  */
4970 #endif
4971 
4972 /**
4973  * Put a string representing the codec tag codec_tag in buf.
4974  *
4975  * @param buf buffer to place codec tag in
4976  * @param buf_size size in bytes of buf
4977  * @param codec_tag codec tag to assign
4978  * @return the length of the string that would have been generated if
4979  * enough space had been available, excluding the trailing null
4980  */
4981 size_t av_get_codec_tag_string(char *buf, size_t buf_size, unsigned int codec_tag);
4982 
4983 void avcodec_string(char *buf, int buf_size, AVCodecContext *enc, int encode);
4984 
4985 /**
4986  * Return a name for the specified profile, if available.
4987  *
4988  * @param codec the codec that is searched for the given profile
4989  * @param profile the profile value for which a name is requested
4990  * @return A name for the profile if found, NULL otherwise.
4991  */
4992 const char *av_get_profile_name(const AVCodec *codec, int profile);
4993 
4994 int avcodec_default_execute(AVCodecContext *c, int (*func)(AVCodecContext *c2, void *arg2),void *arg, int *ret, int count, int size);
4995 int avcodec_default_execute2(AVCodecContext *c, int (*func)(AVCodecContext *c2, void *arg2, int, int),void *arg, int *ret, int count);
4996 //FIXME func typedef
4997 
4998 /**
4999  * Fill AVFrame audio data and linesize pointers.
5000  *
5001  * The buffer buf must be a preallocated buffer with a size big enough
5002  * to contain the specified samples amount. The filled AVFrame data
5003  * pointers will point to this buffer.
5004  *
5005  * AVFrame extended_data channel pointers are allocated if necessary for
5006  * planar audio.
5007  *
5008  * @param frame the AVFrame
5009  * frame->nb_samples must be set prior to calling the
5010  * function. This function fills in frame->data,
5011  * frame->extended_data, frame->linesize[0].
5012  * @param nb_channels channel count
5013  * @param sample_fmt sample format
5014  * @param buf buffer to use for frame data
5015  * @param buf_size size of buffer
5016  * @param align plane size sample alignment (0 = default)
5017  * @return >=0 on success, negative error code on failure
5018  * @todo return the size in bytes required to store the samples in
5019  * case of success, at the next libavutil bump
5020  */
5022  enum AVSampleFormat sample_fmt, const uint8_t *buf,
5023  int buf_size, int align);
5024 
5025 /**
5026  * Reset the internal decoder state / flush internal buffers. Should be called
5027  * e.g. when seeking or when switching to a different stream.
5028  *
5029  * @note when refcounted frames are not used (i.e. avctx->refcounted_frames is 0),
5030  * this invalidates the frames previously returned from the decoder. When
5031  * refcounted frames are used, the decoder just releases any references it might
5032  * keep internally, but the caller's reference remains valid.
5033  */
5035 
5036 /**
5037  * Return codec bits per sample.
5038  *
5039  * @param[in] codec_id the codec
5040  * @return Number of bits per sample or zero if unknown for the given codec.
5041  */
5043 
5044 /**
5045  * Return the PCM codec associated with a sample format.
5046  * @param be endianness, 0 for little, 1 for big,
5047  * -1 (or anything else) for native
5048  * @return AV_CODEC_ID_PCM_* or AV_CODEC_ID_NONE
5049  */
5050 enum AVCodecID av_get_pcm_codec(enum AVSampleFormat fmt, int be);
5051 
5052 /**
5053  * Return codec bits per sample.
5054  * Only return non-zero if the bits per sample is exactly correct, not an
5055  * approximation.
5056  *
5057  * @param[in] codec_id the codec
5058  * @return Number of bits per sample or zero if unknown for the given codec.
5059  */
5061 
5062 /**
5063  * Return audio frame duration.
5064  *
5065  * @param avctx codec context
5066  * @param frame_bytes size of the frame, or 0 if unknown
5067  * @return frame duration, in samples, if known. 0 if not able to
5068  * determine.
5069  */
5070 int av_get_audio_frame_duration(AVCodecContext *avctx, int frame_bytes);
5071 
5072 
5074  void *priv_data;
5079 
5080 
5081 typedef struct AVBitStreamFilter {
5082  const char *name;
5085  AVCodecContext *avctx, const char *args,
5086  uint8_t **poutbuf, int *poutbuf_size,
5087  const uint8_t *buf, int buf_size, int keyframe);
5091 
5092 /**
5093  * Register a bitstream filter.
5094  *
5095  * The filter will be accessible to the application code through
5096  * av_bitstream_filter_next() or can be directly initialized with
5097  * av_bitstream_filter_init().
5098  *
5099  * @see avcodec_register_all()
5100  */
5102 
5103 /**
5104  * Create and initialize a bitstream filter context given a bitstream
5105  * filter name.
5106  *
5107  * The returned context must be freed with av_bitstream_filter_close().
5108  *
5109  * @param name the name of the bitstream filter
5110  * @return a bitstream filter context if a matching filter was found
5111  * and successfully initialized, NULL otherwise
5112  */
5114 
5115 /**
5116  * Filter bitstream.
5117  *
5118  * This function filters the buffer buf with size buf_size, and places the
5119  * filtered buffer in the buffer pointed to by poutbuf.
5120  *
5121  * The output buffer must be freed by the caller.
5122  *
5123  * @param bsfc bitstream filter context created by av_bitstream_filter_init()
5124  * @param avctx AVCodecContext accessed by the filter, may be NULL.
5125  * If specified, this must point to the encoder context of the
5126  * output stream the packet is sent to.
5127  * @param args arguments which specify the filter configuration, may be NULL
5128  * @param poutbuf pointer which is updated to point to the filtered buffer
5129  * @param poutbuf_size pointer which is updated to the filtered buffer size in bytes
5130  * @param buf buffer containing the data to filter
5131  * @param buf_size size in bytes of buf
5132  * @param keyframe set to non-zero if the buffer to filter corresponds to a key-frame packet data
5133  * @return >= 0 in case of success, or a negative error code in case of failure
5134  *
5135  * If the return value is positive, an output buffer is allocated and
5136  * is available in *poutbuf, and is distinct from the input buffer.
5137  *
5138  * If the return value is 0, the output buffer is not allocated and
5139  * should be considered identical to the input buffer, or in case
5140  * *poutbuf was set it points to the input buffer (not necessarily to
5141  * its starting address).
5142  */
5144  AVCodecContext *avctx, const char *args,
5145  uint8_t **poutbuf, int *poutbuf_size,
5146  const uint8_t *buf, int buf_size, int keyframe);
5147 
5148 /**
5149  * Release bitstream filter context.
5150  *
5151  * @param bsf the bitstream filter context created with
5152  * av_bitstream_filter_init(), can be NULL
5153  */
5155 
5156 /**
5157  * If f is NULL, return the first registered bitstream filter,
5158  * if f is non-NULL, return the next registered bitstream filter
5159  * after f, or NULL if f is the last one.
5160  *
5161  * This function can be used to iterate over all registered bitstream
5162  * filters.
5163  */
5165 
5166 /* memory */
5167 
5168 /**
5169  * Same behaviour av_fast_malloc but the buffer has additional
5170  * FF_INPUT_BUFFER_PADDING_SIZE at the end which will always be 0.
5171  *
5172  * In addition the whole buffer will initially and after resizes
5173  * be 0-initialized so that no uninitialized data will ever appear.
5174  */
5175 void av_fast_padded_malloc(void *ptr, unsigned int *size, size_t min_size);
5176 
5177 /**
5178  * Same behaviour av_fast_padded_malloc except that buffer will always
5179  * be 0-initialized after call.
5180  */
5181 void av_fast_padded_mallocz(void *ptr, unsigned int *size, size_t min_size);
5182 
5183 /**
5184  * Encode extradata length to a buffer. Used by xiph codecs.
5185  *
5186  * @param s buffer to write to; must be at least (v/255+1) bytes long
5187  * @param v size of extradata in bytes
5188  * @return number of bytes written to the buffer.
5189  */
5190 unsigned int av_xiphlacing(unsigned char *s, unsigned int v);
5191 
5192 #if FF_API_MISSING_SAMPLE
5193 /**
5194  * Log a generic warning message about a missing feature. This function is
5195  * intended to be used internally by FFmpeg (libavcodec, libavformat, etc.)
5196  * only, and would normally not be used by applications.
5197  * @param[in] avc a pointer to an arbitrary struct of which the first field is
5198  * a pointer to an AVClass struct
5199  * @param[in] feature string containing the name of the missing feature
5200  * @param[in] want_sample indicates if samples are wanted which exhibit this feature.
5201  * If want_sample is non-zero, additional verbage will be added to the log
5202  * message which tells the user how to report samples to the development
5203  * mailing list.
5204  * @deprecated Use avpriv_report_missing_feature() instead.
5205  */
5207 void av_log_missing_feature(void *avc, const char *feature, int want_sample);
5208 
5209 /**
5210  * Log a generic warning message asking for a sample. This function is
5211  * intended to be used internally by FFmpeg (libavcodec, libavformat, etc.)
5212  * only, and would normally not be used by applications.
5213  * @param[in] avc a pointer to an arbitrary struct of which the first field is
5214  * a pointer to an AVClass struct
5215  * @param[in] msg string containing an optional message, or NULL if no message
5216  * @deprecated Use avpriv_request_sample() instead.
5217  */
5219 void av_log_ask_for_sample(void *avc, const char *msg, ...) av_printf_format(2, 3);
5220 #endif /* FF_API_MISSING_SAMPLE */
5221 
5222 /**
5223  * Register the hardware accelerator hwaccel.
5224  */
5225 void av_register_hwaccel(AVHWAccel *hwaccel);
5226 
5227 /**
5228  * If hwaccel is NULL, returns the first registered hardware accelerator,
5229  * if hwaccel is non-NULL, returns the next registered hardware accelerator
5230  * after hwaccel, or NULL if hwaccel is the last one.
5231  */
5232 AVHWAccel *av_hwaccel_next(const AVHWAccel *hwaccel);
5233 
5234 
5235 /**
5236  * Lock operation used by lockmgr
5237  */
5238 enum AVLockOp {
5239  AV_LOCK_CREATE, ///< Create a mutex
5240  AV_LOCK_OBTAIN, ///< Lock the mutex
5241  AV_LOCK_RELEASE, ///< Unlock the mutex
5242  AV_LOCK_DESTROY, ///< Free mutex resources
5243 };
5244 
5245 /**
5246  * Register a user provided lock manager supporting the operations
5247  * specified by AVLockOp. The "mutex" argument to the function points
5248  * to a (void *) where the lockmgr should store/get a pointer to a user
5249  * allocated mutex. It is NULL upon AV_LOCK_CREATE and equal to the
5250  * value left by the last call for all other ops. If the lock manager is
5251  * unable to perform the op then it should leave the mutex in the same
5252  * state as when it was called and return a non-zero value. However,
5253  * when called with AV_LOCK_DESTROY the mutex will always be assumed to
5254  * have been successfully destroyed. If av_lockmgr_register succeeds
5255  * it will return a non-negative value, if it fails it will return a
5256  * negative value and destroy all mutex and unregister all callbacks.
5257  * av_lockmgr_register is not thread-safe, it must be called from a
5258  * single thread before any calls which make use of locking are used.
5259  *
5260  * @param cb User defined callback. av_lockmgr_register invokes calls
5261  * to this callback and the previously registered callback.
5262  * The callback will be used to create more than one mutex
5263  * each of which must be backed by its own underlying locking
5264  * mechanism (i.e. do not use a single static object to
5265  * implement your lock manager). If cb is set to NULL the
5266  * lockmgr will be unregistered.
5267  */
5268 int av_lockmgr_register(int (*cb)(void **mutex, enum AVLockOp op));
5269 
5270 /**
5271  * Get the type of the given codec.
5272  */
5274 
5275 /**
5276  * Get the name of a codec.
5277  * @return a static string identifying the codec; never NULL
5278  */
5279 const char *avcodec_get_name(enum AVCodecID id);
5280 
5281 /**
5282  * @return a positive value if s is open (i.e. avcodec_open2() was called on it
5283  * with no corresponding avcodec_close()), 0 otherwise.
5284  */
5286 
5287 /**
5288  * @return a non-zero number if codec is an encoder, zero otherwise
5289  */
5290 int av_codec_is_encoder(const AVCodec *codec);
5291 
5292 /**
5293  * @return a non-zero number if codec is a decoder, zero otherwise
5294  */
5295 int av_codec_is_decoder(const AVCodec *codec);
5296 
5297 /**
5298  * @return descriptor for given codec ID or NULL if no descriptor exists.
5299  */
5301 
5302 /**
5303  * Iterate over all codec descriptors known to libavcodec.
5304  *
5305  * @param prev previous descriptor. NULL to get the first descriptor.
5306  *
5307  * @return next descriptor or NULL after the last descriptor
5308  */
5310 
5311 /**
5312  * @return codec descriptor with the given name or NULL if no such descriptor
5313  * exists.
5314  */
5316 
5317 /**
5318  * @}
5319  */
5320 
5321 #endif /* AVCODEC_AVCODEC_H */
codec_id is not known (like AV_CODEC_ID_NONE) but lavf should attempt to identify it ...
Definition: avcodec.h:542
int(* parser_init)(AVCodecParserContext *s)
Definition: avcodec.h:4428
const struct AVCodec * codec
Definition: avcodec.h:1250
AVRational framerate
Definition: avcodec.h:3023
const char const char void * val
Definition: avisynth_c.h:634
discard all frames except keyframes
Definition: avcodec.h:668
AVSideDataParamChangeFlags
Definition: avcodec.h:1211
int(* start_frame)(AVCodecContext *avctx, const uint8_t *buf, uint32_t buf_size)
Called at the beginning of each frame or field picture.
Definition: avcodec.h:3351
float v
const AVCodecDescriptor * codec_descriptor
AVCodecDescriptor Code outside libavcodec should access this field using: av_codec_{get,set}_codec_descriptor(avctx)
Definition: avcodec.h:3048
const char * s
Definition: avisynth_c.h:631
static enum AVPixelFormat pix_fmt
#define AV_NUM_DATA_POINTERS
Definition: frame.h:172
AVPacketSideDataType
Definition: avcodec.h:977
int64_t pts_correction_num_faulty_dts
Number of incorrect PTS values so far.
Definition: avcodec.h:3067
A list of zero terminated key/value strings.
Definition: avcodec.h:1108
int linesize[AV_NUM_DATA_POINTERS]
number of bytes per line
Definition: avcodec.h:3454
void av_free_packet(AVPacket *pkt)
Free a packet.
Definition: avpacket.c:280
This structure describes decoded (raw) audio or video data.
Definition: frame.h:171
The optional first identifier line of a WebVTT cue.
Definition: avcodec.h:1095
int avcodec_default_execute2(AVCodecContext *c, int(*func)(AVCodecContext *c2, void *arg2, int, int), void *arg, int *ret, int count)
AVCodec * avcodec_find_encoder(enum AVCodecID id)
Find a registered encoder with a matching codec ID.
Definition: utils.c:2932
int(* init)(AVCodecContext *avctx)
Initialize the hwaccel private data.
Definition: avcodec.h:3405
int x
top left corner of pict, undefined when pict is not set
Definition: avcodec.h:3482
int mpeg_quant
0-> h263 quant 1-> mpeg quant
Definition: avcodec.h:1540
int dct_algo
DCT algorithm, see FF_DCT_* below.
Definition: avcodec.h:2670
A dummy id pointing at the start of audio codecs.
Definition: avcodec.h:328
attribute_deprecated int avpicture_deinterlace(AVPicture *dst, const AVPicture *src, enum AVPixelFormat pix_fmt, int width, int height)
deinterlace - if not supported return -1
Definition: imgconvert.c:409
ptrdiff_t const GLvoid * data
Definition: opengl_enc.c:101
uint64_t error[AV_NUM_DATA_POINTERS]
error
Definition: avcodec.h:2663
int coded_width
Bitstream width / height, may be different from width/height e.g.
Definition: avcodec.h:1424
int capabilities
Hardware accelerated codec capabilities.
Definition: avcodec.h:3321
const char * fmt
Definition: avisynth_c.h:632
void(* flush)(AVCodecContext *)
Flush buffers.
Definition: avcodec.h:3272
int av_lockmgr_register(int(*cb)(void **mutex, enum AVLockOp op))
Register a user provided lock manager supporting the operations specified by AVLockOp.
Definition: utils.c:3588
float qblur
amount of qscale smoothing over time (0.0-1.0)
Definition: avcodec.h:2263
Unlock the mutex.
Definition: avcodec.h:5241
attribute_deprecated int rc_qmod_freq
Definition: avcodec.h:2296
int64_t pos
byte position in stream, -1 if unknown
Definition: avcodec.h:1187
void av_shrink_packet(AVPacket *pkt, int size)
Reduce packet size, correctly zeroing padding.
Definition: avpacket.c:103
Subtitle event position.
Definition: avcodec.h:1082
attribute_deprecated int request_channels
Decoder should decode to this many channels if it can (0 for default)
Definition: avcodec.h:2038
int64_t next_frame_offset
Definition: avcodec.h:4253
AVFrame * coded_frame
the picture in the bitstream
Definition: avcodec.h:2745
int id
id
Definition: avcodec.h:929
int max_b_frames
maximum number of B-frames between non-B-frames Note: The output will be delayed by max_b_frames+1 re...
Definition: avcodec.h:1503
int rc_initial_buffer_occupancy
Number of bits which should be loaded into the rc buffer before decoding starts.
Definition: avcodec.h:2366
Dummy codec for streams containing only metadata information.
Definition: avcodec.h:548
int height
Definition: avcodec.h:937
int width
Dimensions of the decoded video intended for presentation.
Definition: avcodec.h:4405
attribute_deprecated int audio_resample(ReSampleContext *s, short *output, short *input, int nb_samples)
Definition: resample.c:284
This side data should be associated with a video stream and contains Stereoscopic 3D information in f...
Definition: avcodec.h:1038
const char * avcodec_configuration(void)
Return the libavcodec build-time configuration.
Definition: utils.c:3218
enum AVColorRange color_range
MPEG vs JPEG YUV range.
Definition: avcodec.h:1960
attribute_deprecated unsigned int stream_codec_tag
Definition: avcodec.h:1280
int qscale
Definition: avcodec.h:691
enum AVFieldOrder field_order
Definition: avcodec.h:4382
void av_codec_set_pkt_timebase(AVCodecContext *avctx, AVRational val)
struct AVBitStreamFilter * next
Definition: avcodec.h:5089
void(* rtp_callback)(struct AVCodecContext *avctx, void *data, int size, int mb_nb)
Definition: avcodec.h:2463
int nb_colors
number of colors in pict, undefined when pict is not set
Definition: avcodec.h:3486
int size
Definition: avcodec.h:1163
attribute_deprecated int lmax
Definition: avcodec.h:2400
int mb_lmin
minimum MB lagrange multipler
Definition: avcodec.h:1859
const char * avcodec_license(void)
Return the libavcodec license.
Definition: utils.c:3223
int codec_ids[5]
Definition: avcodec.h:4426
enhanced predictive zonal search
Definition: avcodec.h:649
int coded_width
Dimensions of the coded video.
Definition: avcodec.h:4411
enum AVPixelFormat pix_fmt
Supported pixel format.
Definition: avcodec.h:3315
AVRational sample_aspect_ratio
sample aspect ratio (0 if unknown) That is the width of a pixel divided by the height of the pixel...
Definition: avcodec.h:1623
int av_picture_crop(AVPicture *dst, const AVPicture *src, enum AVPixelFormat pix_fmt, int top_band, int left_band)
Crop image top and left side.
Definition: imgconvert.c:198
enum AVPixelFormat pix_fmt
Pixel format, see AV_PIX_FMT_xxx.
Definition: avcodec.h:1444
external API header
int avpicture_layout(const AVPicture *src, enum AVPixelFormat pix_fmt, int width, int height, unsigned char *dest, int dest_size)
Copy pixel data from an AVPicture into a buffer.
Definition: avpicture.c:41
unsigned num_rects
Definition: avcodec.h:3511
void av_fast_padded_malloc(void *ptr, unsigned int *size, size_t min_size)
Same behaviour av_fast_malloc but the buffer has additional FF_INPUT_BUFFER_PADDING_SIZE at the end w...
Definition: utils.c:139
enum AVMediaType type
Type of codec implemented by the hardware accelerator.
Definition: avcodec.h:3301
A dummy ID pointing at the start of various fake codecs.
Definition: avcodec.h:530
char * stats_in
pass2 encoding statistics input buffer Concatenated stuff from stats_out of pass1 should be placed he...
Definition: avcodec.h:2502
int ildct_cmp
interlaced DCT comparison function
Definition: avcodec.h:1648
attribute_deprecated void * thread_opaque
Definition: avcodec.h:2820
enum AVMediaType type
Definition: avcodec.h:3194
size_t av_get_codec_tag_string(char *buf, size_t buf_size, unsigned int codec_tag)
Put a string representing the codec tag codec_tag in buf.
Definition: utils.c:2990
int rtp_payload_size
Definition: avcodec.h:2465
int(* decode)(AVCodecContext *, void *outdata, int *outdata_size, AVPacket *avpkt)
Definition: avcodec.h:3266
discard all non intra frames
Definition: avcodec.h:667
int duration
Duration of the current frame.
Definition: avcodec.h:4380
discard all
Definition: avcodec.h:669
int intra_quant_bias
intra quantizer bias
Definition: avcodec.h:1742
static AVPacket pkt
int64_t cur_frame_pos[AV_PARSER_PTS_NB]
Position of the packet in file.
Definition: avcodec.h:4363
int avcodec_encode_audio2(AVCodecContext *avctx, AVPacket *avpkt, const AVFrame *frame, int *got_packet_ptr)
Encode a frame of audio.
Definition: utils.c:1837
int bits_per_raw_sample
Bits per sample/pixel of internal libavcodec pixel/sample format.
Definition: avcodec.h:2727
int avcodec_enum_to_chroma_pos(int *xpos, int *ypos, enum AVChromaLocation pos)
Converts AVChromaLocation to swscale x/y chroma position.
Definition: utils.c:455
void avcodec_register_all(void)
Register all the codecs, parsers and bitstream filters which were enabled at configuration time...
Definition: allcodecs.c:68
int dts_ref_dts_delta
Offset of the current timestamp against last timestamp sync point in units of AVCodecContext.time_base.
Definition: avcodec.h:4342
int avcodec_decode_subtitle2(AVCodecContext *avctx, AVSubtitle *sub, int *got_sub_ptr, AVPacket *avpkt)
Decode a subtitle message.
Definition: utils.c:2730
attribute_deprecated void avcodec_default_release_buffer(AVCodecContext *s, AVFrame *pic)
Definition: utils.c:1091
int av_dup_packet(AVPacket *pkt)
Definition: avpacket.c:248
attribute_deprecated int(* get_buffer)(struct AVCodecContext *c, AVFrame *pic)
Called at the beginning of each frame to get a buffer for it.
Definition: avcodec.h:2134
Picture data structure.
Definition: avcodec.h:3452
int profile
profile
Definition: avcodec.h:2835
int frame_skip_cmp
frame skip comparison function
Definition: avcodec.h:2429
An AV_PKT_DATA_H263_MB_INFO side data packet contains a number of structures with info about macroblo...
Definition: avcodec.h:1017
AVCodec.
Definition: avcodec.h:3181
int avcodec_copy_context(AVCodecContext *dest, const AVCodecContext *src)
Copy the settings of the source AVCodecContext into the destination AVCodecContext.
Definition: options.c:180
int block_align
number of bytes per packet if constant and known or 0 Used by some WAV based audio codecs...
Definition: avcodec.h:2022
float i_quant_offset
qscale offset between P and I-frames
Definition: avcodec.h:1556
int avpicture_fill(AVPicture *picture, const uint8_t *ptr, enum AVPixelFormat pix_fmt, int width, int height)
Setup the picture fields based on the specified image parameters and the provided image data buffer...
Definition: avpicture.c:34
AVLockOp
Lock operation used by lockmgr.
Definition: avcodec.h:5238
AVColorTransferCharacteristic
Color Transfer Characteristic.
Definition: pixfmt.h:477
uint64_t vbv_delay
VBV delay coded in the last frame (in periods of a 27 MHz clock).
Definition: avcodec.h:2983
attribute_deprecated void(* release_buffer)(struct AVCodecContext *c, AVFrame *pic)
Called to release buffers which were allocated with get_buffer.
Definition: avcodec.h:2148
char * text
0 terminated plain UTF-8 text
Definition: avcodec.h:3495
attribute_deprecated unsigned avcodec_get_edge_width(void)
Return the amount of padding in pixels which the get_buffer callback must provide around the edge of ...
Definition: utils.c:213
int scenechange_threshold
scene change detection threshold 0 is default, larger means fewer detected scene changes.
Definition: avcodec.h:1802
Macro definitions for various function/variable attributes.
attribute_deprecated void av_log_missing_feature(void *avc, const char *feature, int want_sample)
Log a generic warning message about a missing feature.
Definition: utils.c:3544
AVRational time_base
This is the fundamental unit of time (in seconds) in terms of which frame timestamps are represented...
Definition: avcodec.h:1369
int avcodec_get_pix_fmt_loss(enum AVPixelFormat dst_pix_fmt, enum AVPixelFormat src_pix_fmt, int has_alpha)
Definition: imgconvert.c:51
attribute_deprecated int av_resample(struct AVResampleContext *c, short *dst, short *src, int *consumed, int src_size, int dst_size, int update_ctx)
Resample an array of samples using a previously configured context.
Definition: resample2.c:237
int av_codec_is_decoder(const AVCodec *codec)
Definition: utils.c:192
AVSubtitleRect ** rects
Definition: avcodec.h:3512
enum AVAudioServiceType audio_service_type
Type of service that the audio stream conveys.
Definition: avcodec.h:2060
const AVCodecDescriptor * avcodec_descriptor_next(const AVCodecDescriptor *prev)
Iterate over all codec descriptors known to libavcodec.
Definition: codec_desc.c:2901
void av_picture_copy(AVPicture *dst, const AVPicture *src, enum AVPixelFormat pix_fmt, int width, int height)
Copy image src to dst.
Definition: avpicture.c:72
int avcodec_fill_audio_frame(AVFrame *frame, int nb_channels, enum AVSampleFormat sample_fmt, const uint8_t *buf, int buf_size, int align)
Fill AVFrame audio data and linesize pointers.
Definition: utils.c:478
enum AVDiscard skip_frame
Skip decoding for selected frames.
Definition: avcodec.h:2947
const AVClass * avcodec_get_class(void)
Get the AVClass for AVCodecContext.
Definition: options.c:256
int av_codec_is_encoder(const AVCodec *codec)
Definition: utils.c:187
void avcodec_align_dimensions(AVCodecContext *s, int *width, int *height)
Modify width and height values so that they will result in a memory buffer that is acceptable for the...
Definition: utils.c:440
int w
width of pict, undefined when pict is not set
Definition: avcodec.h:3484
struct AVHWAccel * hwaccel
Hardware accelerator in use.
Definition: avcodec.h:2644
float p_masking
p block masking (0-> disabled)
Definition: avcodec.h:1584
void av_codec_set_chroma_intra_matrix(AVCodecContext *avctx, uint16_t *val)
int context_model
context model
Definition: avcodec.h:2387
AVCodecParserContext * parser
Definition: avcodec.h:5076
attribute_deprecated char codec_name[32]
Definition: avcodec.h:1256
Public dictionary API.
int(* init_thread_copy)(AVCodecContext *)
If defined, called on thread contexts when they are created.
Definition: avcodec.h:3230
static double cb(void *priv, double x, double y)
Definition: vf_geq.c:96
int bit_rate_tolerance
number of bits the bitstream is allowed to diverge from the reference.
Definition: avcodec.h:1313
int mb_lmax
maximum MB lagrange multipler
Definition: avcodec.h:1866
enum AVPictureStructure picture_structure
Indicate whether a picture is coded as a frame, top field or bottom field.
Definition: avcodec.h:4392
enum AVPixelFormat avcodec_default_get_format(struct AVCodecContext *s, const enum AVPixelFormat *fmt)
Definition: utils.c:1146
attribute_deprecated float rc_buffer_aggressivity
Definition: avcodec.h:2341
attribute_deprecated const char * rc_eq
Definition: avcodec.h:2319
enum AVSampleFormat sample_fmt
audio sample format
Definition: avcodec.h:1993
Lock the mutex.
Definition: avcodec.h:5240
uint8_t
void * hwaccel_context
Hardware accelerator context.
Definition: avcodec.h:2656
int av_packet_unpack_dictionary(const uint8_t *data, int size, AVDictionary **dict)
Unpack a dictionary from side_data.
Definition: avpacket.c:481
int av_parser_change(AVCodecParserContext *s, AVCodecContext *avctx, uint8_t **poutbuf, int *poutbuf_size, const uint8_t *buf, int buf_size, int keyframe)
Definition: parser.c:186
int subtitle_header_size
Definition: avcodec.h:2958
int me_range
maximum motion estimation search range in subpel units If 0 then no limit.
Definition: avcodec.h:1735
attribute_deprecated void(* destruct)(struct AVPacket *)
Definition: avcodec.h:1183
AVColorSpace
YUV colorspace type.
Definition: pixfmt.h:500
unsigned int avcodec_pix_fmt_to_codec_tag(enum AVPixelFormat pix_fmt)
Return a value representing the fourCC code associated to the pixel format pix_fmt, or 0 if no associated fourCC code can be found.
Definition: raw.c:232
uint16_t * chroma_intra_matrix
custom intra quantization matrix Code outside libavcodec should access this field using av_codec_g/se...
Definition: avcodec.h:3130
This side data contains a 3x3 transformation matrix describing an affine transformation that needs to...
Definition: avcodec.h:1032
float b_quant_factor
qscale factor between IP and B-frames If > 0 then the last P-frame quantizer will be used (q= lastp_q...
Definition: avcodec.h:1512
int pre_dia_size
ME prepass diamond size & shape.
Definition: avcodec.h:1699
int av_packet_from_data(AVPacket *pkt, uint8_t *data, int size)
Initialize a reference-counted packet from av_malloc()ed data.
Definition: avpacket.c:144
uint8_t * extradata
some codecs need / can use extradata like Huffman tables.
Definition: avcodec.h:1355
const AVClass * av_class
information on struct for av_log
Definition: avcodec.h:1246
int me_cmp
motion estimation comparison function
Definition: avcodec.h:1630
int avcodec_encode_video2(AVCodecContext *avctx, AVPacket *avpkt, const AVFrame *frame, int *got_packet_ptr)
Encode a frame of video.
Definition: utils.c:2101
static AVFrame * frame
struct AVCodecParser * next
Definition: avcodec.h:4437
int rc_strategy
obsolete FIXME remove
Definition: avcodec.h:1515
void av_codec_set_lowres(AVCodecContext *avctx, int val)
const char * name
Definition: avcodec.h:5082
attribute_deprecated void av_resample_close(struct AVResampleContext *c)
Definition: resample2.c:226
int coder_type
coder type
Definition: avcodec.h:2380
uint8_t * data
Definition: avcodec.h:1162
void av_packet_move_ref(AVPacket *dst, AVPacket *src)
Move every field in src to dst and reset src.
Definition: avpacket.c:588
void(* decode_mb)(struct MpegEncContext *s)
Called for every Macroblock in a slice.
Definition: avcodec.h:3396
Motion_Est_ID
motion estimation type.
Definition: avcodec.h:644
attribute_deprecated int(* reget_buffer)(struct AVCodecContext *c, AVFrame *pic)
Called at the beginning of a frame to get cr buffer for it.
Definition: avcodec.h:2163
uint8_t * data
Definition: avcodec.h:1112
int(* parser_parse)(AVCodecParserContext *s, AVCodecContext *avctx, const uint8_t **poutbuf, int *poutbuf_size, const uint8_t *buf, int buf_size)
Definition: avcodec.h:4431
int lowres
low resolution decoding, 1-> 1/2 size, 2->1/4 size
Definition: avcodec.h:2737
AVColorRange
MPEG vs JPEG YUV range.
Definition: pixfmt.h:520
const AVCodecDescriptor * av_codec_get_codec_descriptor(const AVCodecContext *avctx)
const AVClass * avcodec_get_frame_class(void)
Get the AVClass for AVFrame.
Definition: options.c:283
ptrdiff_t size
Definition: opengl_enc.c:101
int h
height of pict, undefined when pict is not set
Definition: avcodec.h:3485
void avpicture_free(AVPicture *picture)
Free a picture previously allocated by avpicture_alloc().
Definition: avpicture.c:67
int bits_per_coded_sample
bits per sample/pixel from the demuxer (needed for huffyuv).
Definition: avcodec.h:2720
int min_prediction_order
Definition: avcodec.h:2442
float lumi_masking
luminance masking (0-> disabled)
Definition: avcodec.h:1563
char * stats_out
pass1 encoding statistics output buffer
Definition: avcodec.h:2494
AVColorPrimaries
Chromaticity coordinates of the source primaries.
Definition: pixfmt.h:459
int duration
Duration of this packet in AVStream->time_base units, 0 if unknown.
Definition: avcodec.h:1180
const OptionDef options[]
Definition: ffserver.c:3798
struct AVBitStreamFilterContext * next
Definition: avcodec.h:5077
enum AVChromaLocation chroma_sample_location
This defines the location of chroma samples.
Definition: avcodec.h:1967
float quality_factor
Definition: avcodec.h:692
int av_packet_ref(AVPacket *dst, const AVPacket *src)
Setup a new reference to the data described by a given packet.
Definition: avpacket.c:559
hexagon based search
Definition: avcodec.h:651
AVCodec * avcodec_find_encoder_by_name(const char *name)
Find a registered encoder with the specified name.
Definition: utils.c:2937
int chromaoffset
chroma qp offset from luma
Definition: avcodec.h:1908
void avcodec_align_dimensions2(AVCodecContext *s, int *width, int *height, int linesize_align[AV_NUM_DATA_POINTERS])
Modify width and height values so that they will result in a memory buffer that is acceptable for the...
Definition: utils.c:279
int slice_count
slice count
Definition: avcodec.h:1598
uint16_t * av_codec_get_chroma_intra_matrix(const AVCodecContext *avctx)
attribute_deprecated void avcodec_set_dimensions(AVCodecContext *s, int width, int height)
Definition: utils.c:220
Libavcodec version macros.
int(* close)(AVCodecContext *)
Definition: avcodec.h:3267
int avcodec_close(AVCodecContext *avctx)
Close a given AVCodecContext and free all the data associated with it (but not the AVCodecContext its...
Definition: utils.c:2843
int av_new_packet(AVPacket *pkt, int size)
Allocate the payload of a packet and initialize its fields with default values.
Definition: avpacket.c:83
AVRational pkt_timebase
Timebase in which pkt_dts/pts and AVPacket.dts/pts are.
Definition: avcodec.h:3039
no search, that is use 0,0 vector whenever one is needed
Definition: avcodec.h:645
enum AVCodecID id
Definition: avcodec.h:3195
const uint64_t * channel_layouts
array of support channel layouts, or NULL if unknown. array is terminated by 0
Definition: avcodec.h:3205
reserved for experiments
Definition: avcodec.h:650
const AVCodecDefault * defaults
Private codec-specific defaults.
Definition: avcodec.h:3244
AVCodecID
Identify the syntax and semantics of the bitstream.
Definition: avcodec.h:102
int av_get_bits_per_sample(enum AVCodecID codec_id)
Return codec bits per sample.
Definition: utils.c:3318
int has_b_frames
Size of the frame reordering buffer in the decoder.
Definition: avcodec.h:1533
int64_t pos
Byte position of currently parsed frame in stream.
Definition: avcodec.h:4368
attribute_deprecated float rc_initial_cplx
Definition: avcodec.h:2344
int avcodec_decode_video2(AVCodecContext *avctx, AVFrame *picture, int *got_picture_ptr, const AVPacket *avpkt)
Decode the video frame of size avpkt->size from avpkt->data into picture.
Definition: utils.c:2352
Create a mutex.
Definition: avcodec.h:5239
void av_packet_rescale_ts(AVPacket *pkt, AVRational tb_src, AVRational tb_dst)
Convert valid timing fields (timestamps / durations) in a packet from one timebase to another...
Definition: avpacket.c:594
int profile
Definition: mxfenc.c:1804
int priv_data_size
Definition: avcodec.h:4427
struct AVCodecParser * parser
Definition: avcodec.h:4249
AVAudioServiceType
Definition: avcodec.h:672
int y
top left corner of pict, undefined when pict is not set
Definition: avcodec.h:3483
discard all bidirectional frames
Definition: avcodec.h:666
An AV_PKT_DATA_PARAM_CHANGE side data packet is laid out as follows:
Definition: avcodec.h:996
int frame_skip_threshold
frame skip threshold
Definition: avcodec.h:2408
int me_sub_cmp
subpixel motion estimation comparison function
Definition: avcodec.h:1636
void av_packet_free_side_data(AVPacket *pkt)
Convenience function to free all the side data stored.
Definition: avpacket.c:271
int qmax
maximum quantizer
Definition: avcodec.h:2277
AVCodec * av_codec_next(const AVCodec *c)
If c is NULL, returns the first registered codec, if c is non-NULL, returns the next registered codec...
Definition: utils.c:167
enum AVSampleFormat request_sample_fmt
desired sample format
Definition: avcodec.h:2068
int skip_alpha
Skip processing alpha if supported by codec.
Definition: avcodec.h:3102
int64_t pts_correction_last_pts
Number of incorrect DTS values so far.
Definition: avcodec.h:3068
int active_thread_type
Which multithreading methods are in use by the codec.
Definition: avcodec.h:2772
int avcodec_is_open(AVCodecContext *s)
Definition: utils.c:3779
int error_concealment
error concealment flags
Definition: avcodec.h:2555
int64_t convergence_duration
Time difference in AVStream->time_base units from the pts of this packet to the point at which the ou...
Definition: avcodec.h:1206
int capabilities
Codec capabilities.
Definition: avcodec.h:3200
int initial_padding
Audio only.
Definition: avcodec.h:3015
void av_bitstream_filter_close(AVBitStreamFilterContext *bsf)
Release bitstream filter context.
preferred ID for decoding MPEG audio layer 1, 2 or 3
Definition: avcodec.h:421
AVBufferRef * buf
A reference to the reference-counted buffer where the packet data is stored.
Definition: avcodec.h:1145
const char * arg
Definition: jacosubdec.c:66
int flags
CODEC_FLAG_*.
Definition: avcodec.h:1335
enum AVPixelFormat avcodec_find_best_pix_fmt_of_list(const enum AVPixelFormat *pix_fmt_list, enum AVPixelFormat src_pix_fmt, int has_alpha, int *loss_ptr)
Find the best pixel format to convert to given a certain source pixel format.
Definition: imgconvert.c:78
int rc_max_rate
maximum bitrate
Definition: avcodec.h:2327
int log_level_offset
Definition: avcodec.h:1247
enum AVPacketSideDataType type
Definition: avcodec.h:1114
enum AVMediaType avcodec_get_type(enum AVCodecID codec_id)
Get the type of the given codec.
Definition: utils.c:3759
const char * name
Name of the codec implementation.
Definition: avcodec.h:3188
int64_t cur_frame_dts[AV_PARSER_PTS_NB]
Definition: avcodec.h:4278
float i_quant_factor
qscale factor between P and I-frames If > 0 then the last p frame quantizer will be used (q= lastp_q*...
Definition: avcodec.h:1549
int side_data_elems
Definition: avcodec.h:1174
int width
width and height in 1/16 pel
Definition: avcodec.h:936
int av_packet_shrink_side_data(AVPacket *pkt, enum AVPacketSideDataType type, int size)
Shrink the already allocated side data buffer.
Definition: avpacket.c:506
const char * long_name
A more descriptive name for this codec.
Definition: avcodec.h:572
#define AV_PARSER_PTS_NB
Definition: avcodec.h:4274
AVCodecParser * av_parser_next(const AVCodecParser *c)
Definition: parser.c:35
enum AVCodecID codec_id
Definition: mov_chan.c:433
static const uint8_t offset[127][2]
Definition: vf_spp.c:92
GLsizei count
Definition: opengl_enc.c:109
transformed exhaustive search algorithm
Definition: avcodec.h:653
int compensation_distance
Definition: resample2.c:71
#define av_printf_format(fmtpos, attrpos)
Definition: attributes.h:148
int priv_data_size
Size of the private data to allocate in AVCodecInternal.hwaccel_priv_data.
Definition: avcodec.h:3419
int flags
A combination of AV_PKT_FLAG values.
Definition: avcodec.h:1168
int av_codec_get_lowres(const AVCodecContext *avctx)
reference-counted frame API
const AVCodecDescriptor * avcodec_descriptor_get(enum AVCodecID id)
Definition: codec_desc.c:2891
uint64_t channel_layout
Audio channel layout.
Definition: avcodec.h:2046
uint32_t end_display_time
Definition: avcodec.h:3510
int64_t pts
Same as packet pts, in AV_TIME_BASE.
Definition: avcodec.h:3513
int rc_buffer_size
decoder bitstream buffer size
Definition: avcodec.h:2304
int av_packet_merge_side_data(AVPacket *pkt)
Definition: avpacket.c:364
int props
Codec properties, a combination of AV_CODEC_PROP_* flags.
Definition: avcodec.h:576
int intra_dc_precision
precision of the intra DC coefficient - 8
Definition: avcodec.h:1830
int me_penalty_compensation
Definition: avcodec.h:1873
int(* encode_sub)(AVCodecContext *, uint8_t *buf, int buf_size, const struct AVSubtitle *sub)
Definition: avcodec.h:3252
AVBitStreamFilter * av_bitstream_filter_next(const AVBitStreamFilter *f)
If f is NULL, return the first registered bitstream filter, if f is non-NULL, return the next registe...
Not part of ABI.
Definition: avcodec.h:682
int refs
number of reference frames
Definition: avcodec.h:1901
attribute_deprecated int scenechange_factor
Multiplied by qscale for each frame and added to scene_change_score.
Definition: avcodec.h:1916
A bitmap, pict will be set.
Definition: avcodec.h:3464
int av_packet_copy_props(AVPacket *dst, const AVPacket *src)
Copy only "properties" fields from src to dst.
Definition: avpacket.c:522
int rc_override_count
ratecontrol override, see RcOverride
Definition: avcodec.h:2311
void(* draw_horiz_band)(struct AVCodecContext *s, const AVFrame *src, int offset[AV_NUM_DATA_POINTERS], int y, int type, int height)
If non NULL, 'draw_horiz_band' is called by the libavcodec decoder to draw a horizontal band...
Definition: avcodec.h:1478
int bit_rate
the average bitrate
Definition: avcodec.h:1305
audio channel layout utility functions
int64_t timecode_frame_start
GOP timecode frame start number.
Definition: avcodec.h:2455
enum AVPixelFormat * pix_fmts
array of supported pixel formats, or NULL if unknown, array is terminated by -1
Definition: avcodec.h:3202
attribute_deprecated int avcodec_decode_audio3(AVCodecContext *avctx, int16_t *samples, int *frame_size_ptr, AVPacket *avpkt)
Wrapper function which calls avcodec_decode_audio4.
Definition: utils.c:2446
int err_recognition
Error recognition; may misdetect some more or less valid parts as errors.
Definition: avcodec.h:2612
AVPicture pict
data+linesize for the bitmap of this subtitle.
Definition: avcodec.h:3492
const char * name
Name of the hardware accelerated codec.
Definition: avcodec.h:3294
float y
iterative search
Definition: avcodec.h:654
int av_get_exact_bits_per_sample(enum AVCodecID codec_id)
Return codec bits per sample.
Definition: utils.c:3243
AVCodecContext * avcodec_alloc_context3(const AVCodec *codec)
Allocate an AVCodecContext and set its fields to default values.
Definition: options.c:147
int av_parser_parse2(AVCodecParserContext *s, AVCodecContext *avctx, uint8_t **poutbuf, int *poutbuf_size, const uint8_t *buf, int buf_size, int64_t pts, int64_t dts, int64_t pos)
Parse a packet.
Definition: parser.c:131
int(* alloc_frame)(AVCodecContext *avctx, AVFrame *frame)
Allocate a custom buffer.
Definition: avcodec.h:3335
attribute_deprecated void av_resample_compensate(struct AVResampleContext *c, int sample_delta, int compensation_distance)
Compensate samplerate/timestamp drift.
Definition: resample2.c:231
ret
Definition: avfilter.c:974
int width
picture width / height.
Definition: avcodec.h:1414
void(* parser_close)(AVCodecParserContext *s)
Definition: avcodec.h:4435
AVBitStreamFilterContext * av_bitstream_filter_init(const char *name)
Create and initialize a bitstream filter context given a bitstream filter name.
int idct_algo
IDCT algorithm, see FF_IDCT_* below.
Definition: avcodec.h:2685
typedef void(APIENTRY *FF_PFNGLACTIVETEXTUREPROC)(GLenum texture)
int64_t offset
byte offset from starting packet start
Definition: avcodec.h:4287
int priv_data_size
Definition: avcodec.h:3219
int profile
Definition: avcodec.h:3170
AVS_Value args
Definition: avisynth_c.h:562
float rc_max_available_vbv_use
Ratecontrol attempt to use, at maximum, of what can be used without an underflow. ...
Definition: avcodec.h:2352
float rc_min_vbv_overflow_use
Ratecontrol attempt to use, at least, times the amount needed to prevent a vbv overflow.
Definition: avcodec.h:2359
int64_t convergence_duration
Time difference in stream time base units from the pts of this packet to the point at which the outpu...
Definition: avcodec.h:4315
void av_parser_close(AVCodecParserContext *s)
Definition: parser.c:221
int b_frame_strategy
Definition: avcodec.h:1518
enum AVColorPrimaries color_primaries
Chromaticity coordinates of the source primaries.
Definition: avcodec.h:1939
void av_register_bitstream_filter(AVBitStreamFilter *bsf)
Register a bitstream filter.
int start_frame
Definition: avcodec.h:689
int side_data_only_packets
Encoding only.
Definition: avcodec.h:2998
uint16_t format
Definition: avcodec.h:3508
const AVClass * avcodec_get_subtitle_rect_class(void)
Get the AVClass for AVSubtitleRect.
Definition: options.c:308
int level
level
Definition: avcodec.h:2925
int avcodec_decode_audio4(AVCodecContext *avctx, AVFrame *frame, int *got_frame_ptr, const AVPacket *avpkt)
Decode the audio frame of size avpkt->size from avpkt->data into frame.
Definition: utils.c:2498
const AVProfile * profiles
array of recognized profiles, or NULL if unknown, array is terminated by {FF_PROFILE_UNKNOWN} ...
Definition: avcodec.h:3210
int64_t reordered_opaque
opaque 64bit number (generally a PTS) that will be reordered and output in AVFrame.reordered_opaque
Definition: avcodec.h:2637
int refcounted_frames
If non-zero, the decoded audio and video frames returned from avcodec_decode_video2() and avcodec_dec...
Definition: avcodec.h:2259
int ticks_per_frame
For some codecs, the time base is closer to the field rate than the frame rate.
Definition: avcodec.h:1378
int skip_top
Number of macroblock rows at the top which are skipped.
Definition: avcodec.h:1837
int mb_decision
macroblock decision mode
Definition: avcodec.h:1777
int last_predictor_count
amount of previous MV predictors (2a+1 x 2a+1 square)
Definition: avcodec.h:1678
int max_qdiff
maximum quantizer difference between frames
Definition: avcodec.h:2284
attribute_deprecated int mb_threshold
Definition: avcodec.h:1822
attribute_deprecated float rc_qsquish
Definition: avcodec.h:2291
int64_t cur_frame_end[AV_PARSER_PTS_NB]
Definition: avcodec.h:4288
static pthread_mutex_t * mutex
Definition: w32pthreads.h:166
void avcodec_get_chroma_sub_sample(enum AVPixelFormat pix_fmt, int *h_shift, int *v_shift)
Utility function to access log2_chroma_w log2_chroma_h from the pixel format AVPixFmtDescriptor.
Definition: imgconvert.c:43
char * sub_charenc
DTS of the last frame.
Definition: avcodec.h:3076
int64_t cur_frame_pts[AV_PARSER_PTS_NB]
Definition: avcodec.h:4277
preferred ID for MPEG-1/2 video decoding
Definition: avcodec.h:107
const AVCodecDescriptor * avcodec_descriptor_get_by_name(const char *name)
Definition: codec_desc.c:2910
RcOverride * rc_override
Definition: avcodec.h:2312
int64_t last_pos
Previous frame byte position.
Definition: avcodec.h:4373
const char * avcodec_get_name(enum AVCodecID id)
Get the name of a codec.
Definition: utils.c:2970
int thread_count
thread count is used to decide how many independent tasks should be passed to execute() ...
Definition: avcodec.h:2753
int sub_charenc_mode
Subtitles character encoding mode.
Definition: avcodec.h:3084
int av_packet_split_side_data(AVPacket *pkt)
Definition: avpacket.c:404
int av_codec_get_max_lowres(const AVCodec *codec)
Definition: utils.c:1284
int inter_quant_bias
inter quantizer bias
Definition: avcodec.h:1750
void avcodec_flush_buffers(AVCodecContext *avctx)
Reset the internal decoder state / flush internal buffers.
Definition: utils.c:3229
FAKE codec to indicate a MPEG-4 Systems stream (only used by libavformat)
Definition: avcodec.h:546
const AVS_VideoInfo int align
Definition: avisynth_c.h:658
enum AVPixelFormat avcodec_find_best_pix_fmt_of_2(enum AVPixelFormat dst_pix_fmt1, enum AVPixelFormat dst_pix_fmt2, enum AVPixelFormat src_pix_fmt, int has_alpha, int *loss_ptr)
Definition: imgconvert.c:58
attribute_deprecated enum AVPixelFormat avcodec_find_best_pix_fmt2(enum AVPixelFormat dst_pix_fmt1, enum AVPixelFormat dst_pix_fmt2, enum AVPixelFormat src_pix_fmt, int has_alpha, int *loss_ptr)
Definition: imgconvert.c:71
int frame_skip_factor
frame skip factor
Definition: avcodec.h:2415
const char * av_get_profile_name(const AVCodec *codec, int profile)
Return a name for the specified profile, if available.
Definition: utils.c:3188
int frame_size
Number of samples per channel in an audio frame.
Definition: avcodec.h:2005
int pts_dts_delta
Presentation delay of current frame in units of AVCodecContext.time_base.
Definition: avcodec.h:4356
attribute_deprecated void av_destruct_packet(AVPacket *pkt)
Default packet destructor.
Definition: avpacket.c:35
const char * long_name
Descriptive name for the codec, meant to be more human readable than name.
Definition: avcodec.h:3193
int bidir_refine
Definition: avcodec.h:1880
int av_bitstream_filter_filter(AVBitStreamFilterContext *bsfc, AVCodecContext *avctx, const char *args, uint8_t **poutbuf, int *poutbuf_size, const uint8_t *buf, int buf_size, int keyframe)
Filter bitstream.
attribute_deprecated void av_log_ask_for_sample(void *avc, const char *msg,...) av_printf_format(2
Log a generic warning message asking for a sample.
AVCodecParserContext * av_parser_init(int codec_id)
Definition: parser.c:50
AVS_Value src
Definition: avisynth_c.h:482
int avcodec_default_get_buffer2(AVCodecContext *s, AVFrame *frame, int flags)
The default callback for AVCodecContext.get_buffer2().
Definition: utils.c:719
enum AVMediaType codec_type
Definition: avcodec.h:1249
void(* init_static_data)(struct AVCodec *codec)
Initialize codec static data, called from avcodec_register().
Definition: avcodec.h:3249
const AVRational * supported_framerates
array of supported framerates, or NULL if any, array is terminated by {0,0}
Definition: avcodec.h:3201
A list of zero terminated key/value strings.
Definition: avcodec.h:1071
attribute_deprecated int avcodec_default_reget_buffer(AVCodecContext *s, AVFrame *pic)
Definition: utils.c:1098
AVSampleFormat
Audio sample formats.
Definition: samplefmt.h:59
void avcodec_free_context(AVCodecContext **avctx)
Free the codec context and everything associated with it and write NULL to the provided pointer...
Definition: options.c:162
enum AVCodecID av_get_pcm_codec(enum AVSampleFormat fmt, int be)
Return the PCM codec associated with a sample format.
Definition: utils.c:3297
enum AVCodecID codec_id
Definition: avcodec.h:1258
int compression_level
Definition: avcodec.h:1327
int seek_preroll
Number of samples to skip after a discontinuity.
Definition: avcodec.h:3109
int sample_rate
samples per second
Definition: avcodec.h:1985
enum AVDiscard skip_idct
Skip IDCT/dequantization for selected frames.
Definition: avcodec.h:2940
int frame_bits
number of bits used for the previously encoded frame
Definition: avcodec.h:2487
attribute_deprecated AVPacket * pkt
Definition: avcodec.h:2974
Plain text, the text field must be set by the decoder and is authoritative.
Definition: avcodec.h:3470
int debug
debug
Definition: avcodec.h:2565
main external API structure.
Definition: avcodec.h:1241
AVCodec * avcodec_find_decoder(enum AVCodecID id)
Find a registered decoder with a matching codec ID.
Definition: utils.c:2951
uint8_t * av_packet_pack_dictionary(AVDictionary *dict, int *size)
Pack a dictionary for use in side_data.
Definition: avpacket.c:446
void av_packet_unref(AVPacket *pkt)
Wipe the packet.
Definition: avpacket.c:550
int output_channels
Definition: resample.c:57
int av_copy_packet(AVPacket *dst, const AVPacket *src)
Copy packet, including contents.
Definition: avpacket.c:265
int pre_me
prepass for motion estimation
Definition: avcodec.h:1685
int qmin
minimum quantizer
Definition: avcodec.h:2270
attribute_deprecated ReSampleContext * av_audio_resample_init(int output_channels, int input_channels, int output_rate, int input_rate, enum AVSampleFormat sample_fmt_out, enum AVSampleFormat sample_fmt_in, int filter_length, int log2_phase_count, int linear, double cutoff)
Initialize audio resampling context.
Definition: resample.c:203
void avsubtitle_free(AVSubtitle *sub)
Free all allocated data in the given subtitle struct.
Definition: utils.c:2824
unsigned int codec_tag
fourcc (LSB first, so "ABCD" -> ('D'<<24) + ('C'<<16) + ('B'<<8) + 'A').
Definition: avcodec.h:1273
float spatial_cplx_masking
spatial complexity masking (0-> disabled)
Definition: avcodec.h:1577
void * buf
Definition: avisynth_c.h:553
Data found in BlockAdditional element of matroska container.
Definition: avcodec.h:1090
GLint GLenum type
Definition: opengl_enc.c:105
attribute_deprecated int avcodec_encode_video(AVCodecContext *avctx, uint8_t *buf, int buf_size, const AVFrame *pict)
Definition: utils.c:2066
int extradata_size
Definition: avcodec.h:1356
unsigned int av_xiphlacing(unsigned char *s, unsigned int v)
Encode extradata length to a buffer.
Definition: utils.c:3521
struct AVCodec * next
Definition: avcodec.h:3220
struct AVBitStreamFilter * filter
Definition: avcodec.h:5075
uint16_t * intra_matrix
custom intra quantization matrix
Definition: avcodec.h:1787
BYTE int const BYTE int int int height
Definition: avisynth_c.h:676
int slice_flags
slice flags
Definition: avcodec.h:1757
int coded_height
Definition: avcodec.h:1424
Describe the class of an AVClass context structure.
Definition: log.h:67
int avpicture_alloc(AVPicture *picture, enum AVPixelFormat pix_fmt, int width, int height)
Allocate memory for the pixels of a picture and setup the AVPicture fields for it.
Definition: avpicture.c:54
enum AVPixelFormat(* get_format)(struct AVCodecContext *s, const enum AVPixelFormat *fmt)
callback to negotiate the pixelFormat
Definition: avcodec.h:1495
enum AVColorSpace colorspace
YUV colorspace type.
Definition: avcodec.h:1953
rational number numerator/denominator
Definition: rational.h:43
enum AVColorTransferCharacteristic color_trc
Color Transfer Characteristic.
Definition: avcodec.h:1946
const char * name
short name for the profile
Definition: avcodec.h:3171
void av_register_codec_parser(AVCodecParser *parser)
Definition: parser.c:43
AVFieldOrder
Definition: avcodec.h:1223
Recommmends skipping the specified number of samples.
Definition: avcodec.h:1055
attribute_deprecated void audio_resample_close(ReSampleContext *s)
Free resample context.
Definition: resample.c:430
int(* func)(AVBPrint *dst, const char *in, const char *arg)
Definition: jacosubdec.c:67
AVMediaType
Definition: avutil.h:192
discard useless packets like 0 size packets in avi
Definition: avcodec.h:664
refcounted data buffer API
int(* get_buffer2)(struct AVCodecContext *s, AVFrame *frame, int flags)
This callback is called at the beginning of each frame to get data buffer(s) for it.
Definition: avcodec.h:2246
char * codec_whitelist
',' separated list of allowed decoders.
Definition: avcodec.h:3148
const char * name
Name of the codec described by this descriptor.
Definition: avcodec.h:568
int avcodec_open2(AVCodecContext *avctx, const AVCodec *codec, AVDictionary **options)
Initialize the AVCodecContext to use the given AVCodec.
Definition: utils.c:1330
float b_quant_offset
qscale offset between IP and B-frames
Definition: avcodec.h:1525
attribute_deprecated void * priv
Definition: avcodec.h:1185
int frame_skip_exp
frame skip exponent
Definition: avcodec.h:2422
attribute_deprecated int dtg_active_format
DTG active format information (additional aspect ratio information only used in DVB MPEG-2 transport ...
Definition: avcodec.h:1718
int av_get_audio_frame_duration(AVCodecContext *avctx, int frame_bytes)
Return audio frame duration.
Definition: utils.c:3336
float qcompress
amount of qscale change between easy & hard scenes (0.0-1.0)
Definition: avcodec.h:2262
attribute_deprecated int me_threshold
Definition: avcodec.h:1816
uint16_t * inter_matrix
custom inter quantization matrix
Definition: avcodec.h:1794
int end_frame
Definition: avcodec.h:690
void(* close)(AVBitStreamFilterContext *bsfc)
Definition: avcodec.h:5088
AVHWAccel * av_hwaccel_next(const AVHWAccel *hwaccel)
If hwaccel is NULL, returns the first registered hardware accelerator, if hwaccel is non-NULL...
Definition: utils.c:3583
This struct describes the properties of a single codec described by an AVCodecID. ...
Definition: avcodec.h:560
float dark_masking
darkness masking (0-> disabled)
Definition: avcodec.h:1591
int global_quality
Global quality for codecs which cannot change it per frame.
Definition: avcodec.h:1321
static int64_t pts
Global timestamp for the audio frames.
int skip_bottom
Number of macroblock rows at the bottom which are skipped.
Definition: avcodec.h:1844
int attribute_deprecated avcodec_encode_audio(AVCodecContext *avctx, uint8_t *buf, int buf_size, const short *samples)
Encode an audio frame from samples into buf.
Definition: utils.c:1982
AVCodec * avcodec_find_decoder_by_name(const char *name)
Find a registered decoder with the specified name.
Definition: utils.c:2956
This side data should be associated with an audio stream and contains ReplayGain information in form ...
Definition: avcodec.h:1023
int output_picture_number
Picture number incremented in presentation or output order.
Definition: avcodec.h:4400
float temporal_cplx_masking
temporary complexity masking (0-> disabled)
Definition: avcodec.h:1570
static int flags
Definition: cpu.c:47
int input_channels
Definition: resample.c:57
Pan Scan area.
Definition: avcodec.h:923
const AVClass * priv_class
AVClass for the private context.
Definition: avcodec.h:3209
#define attribute_deprecated
Definition: attributes.h:86
int noise_reduction
noise reduction strength
Definition: avcodec.h:1809
MpegEncContext.
Definition: mpegvideo.h:150
int(* filter)(AVBitStreamFilterContext *bsfc, AVCodecContext *avctx, const char *args, uint8_t **poutbuf, int *poutbuf_size, const uint8_t *buf, int buf_size, int keyframe)
Definition: avcodec.h:5084
struct AVCodecContext * avctx
Definition: mpegvideo.h:167
int gop_size
the number of pictures in a group of pictures, or 0 for intra_only
Definition: avcodec.h:1435
enum AVMediaType type
Definition: avcodec.h:562
uint8_t max_lowres
maximum value for lowres supported by the decoder, no direct access, use av_codec_get_max_lowres() ...
Definition: avcodec.h:3207
A reference to a data buffer.
Definition: buffer.h:81
discard all non reference
Definition: avcodec.h:665
static int op(uint8_t **dst, const uint8_t *dst_end, GetByteContext *gb, int pixel, int count, int *x, int width, int linesize)
Perform decode operation.
Definition: anm.c:78
attribute_deprecated struct AVResampleContext * av_resample_init(int out_rate, int in_rate, int filter_length, int log2_phase_count, int linear, double cutoff)
Initialize an audio resampler.
Definition: resample2.c:192
An AV_PKT_DATA_JP_DUALMONO side data packet indicates that the packet may contain "dual mono" audio s...
Definition: avcodec.h:1065
AVPacketSideData * side_data
Additional packet data that can be provided by the container.
Definition: avcodec.h:1173
int mb_cmp
macroblock comparison function (not supported yet)
Definition: avcodec.h:1642
int(* split)(AVCodecContext *avctx, const uint8_t *buf, int buf_size)
Definition: avcodec.h:4436
enum AVChromaLocation avcodec_chroma_pos_to_enum(int xpos, int ypos)
Converts swscale x/y chroma position to AVChromaLocation.
Definition: utils.c:467
AVRational av_codec_get_pkt_timebase(const AVCodecContext *avctx)
Free mutex resources.
Definition: avcodec.h:5242
rational numbers
attribute_deprecated void void av_register_hwaccel(AVHWAccel *hwaccel)
Register the hardware accelerator hwaccel.
Definition: utils.c:3574
raw UTF-8 text
Definition: avcodec.h:507
struct AVHWAccel * next
Definition: avcodec.h:3330
int nsse_weight
noise vs.
Definition: avcodec.h:2828
static double c[64]
int(* uninit)(AVCodecContext *avctx)
Uninitialize the hwaccel private data.
Definition: avcodec.h:3413
attribute_deprecated float border_masking
Definition: avcodec.h:1851
uint32_t start_display_time
Definition: avcodec.h:3509
int av_codec_get_seek_preroll(const AVCodecContext *avctx)
void av_fast_padded_mallocz(void *ptr, unsigned int *size, size_t min_size)
Same behaviour av_fast_padded_malloc except that buffer will always be 0-initialized after call...
Definition: utils.c:151
void av_codec_set_codec_descriptor(AVCodecContext *avctx, const AVCodecDescriptor *desc)
int prediction_method
prediction method (needed for huffyuv)
Definition: avcodec.h:1604
AVProfile.
Definition: avcodec.h:3169
int workaround_bugs
Work around bugs in encoders which sometimes cannot be detected automatically.
Definition: avcodec.h:2509
enum AVCodecID id
Codec implemented by the hardware accelerator.
Definition: avcodec.h:3308
static const uint64_t c2
Definition: murmur3.c:50
int64_t cur_frame_offset[AV_PARSER_PTS_NB]
Definition: avcodec.h:4276
int av_grow_packet(AVPacket *pkt, int grow_by)
Increase packet size, correctly zeroing padding.
Definition: avpacket.c:111
int caps_internal
Internal codec capabilities.
Definition: avcodec.h:3277
void av_init_packet(AVPacket *pkt)
Initialize optional fields of a packet with default values.
Definition: avpacket.c:49
enum AVDiscard skip_loop_filter
Skip loop filtering for selected frames.
Definition: avcodec.h:2933
int thread_safe_callbacks
Set by the client if its custom get_buffer() callback can be called synchronously from another thread...
Definition: avcodec.h:2782
int avcodec_get_context_defaults3(AVCodecContext *s, const AVCodec *codec)
Set the fields of the given AVCodecContext to default values corresponding to the given codec (defaul...
Definition: options.c:90
attribute_deprecated float rc_qmod_amp
Definition: avcodec.h:2294
AVPictureStructure
Definition: avcodec.h:4240
int trellis
trellis RD quantization
Definition: avcodec.h:2436
The optional settings (rendering instructions) that immediately follow the timestamp specifier of a W...
Definition: avcodec.h:1101
#define MKBETAG(a, b, c, d)
Definition: common.h:316
void avcodec_string(char *buf, int buf_size, AVCodecContext *enc, int encode)
Definition: utils.c:3010
int slices
Number of slices.
Definition: avcodec.h:1976
ASS as defined in Matroska.
Definition: avcodec.h:527
int16_t position[3][2]
position of the top left corner in 1/16 pel for up to 3 fields/frames
Definition: avcodec.h:944
void * priv_data
Definition: avcodec.h:1283
int cutoff
Audio cutoff bandwidth (0 means "automatic")
Definition: avcodec.h:2029
int(* update_thread_context)(AVCodecContext *dst, const AVCodecContext *src)
Copy necessary context variables from a previous thread context to the current one.
Definition: avcodec.h:3238
void av_codec_set_seek_preroll(AVCodecContext *avctx, int val)
FAKE codec to indicate a raw MPEG-2 TS stream (only used by libavformat)
Definition: avcodec.h:544
Formatted text, the ass field must be set by the decoder and is authoritative.
Definition: avcodec.h:3476
int64_t frame_offset
Definition: avcodec.h:4250
enum AVCodecID id
Definition: avcodec.h:561
pixel format definitions
int dia_size
ME diamond size & shape.
Definition: avcodec.h:1671
int b_sensitivity
Adjust sensitivity of b_frame_strategy 1.
Definition: avcodec.h:1932
uint8_t * dump_separator
dump format separator.
Definition: avcodec.h:3140
int(* execute)(struct AVCodecContext *c, int(*func)(struct AVCodecContext *c2, void *arg), void *arg2, int *ret, int count, int size)
The codec may call this to execute several independent things.
Definition: avcodec.h:2793
uneven multi-hexagon search
Definition: avcodec.h:652
as in Berlin toast format
Definition: avcodec.h:438
int(* execute2)(struct AVCodecContext *c, int(*func)(struct AVCodecContext *c2, void *arg, int jobnr, int threadnr), void *arg2, int *ret, int count)
The codec may call this to execute several independent things.
Definition: avcodec.h:2813
int channels
number of audio channels
Definition: avcodec.h:1986
int frame_priv_data_size
Size of per-frame hardware accelerator private data.
Definition: avcodec.h:3385
const int * supported_samplerates
array of supported audio samplerates, or NULL if unknown, array is terminated by 0 ...
Definition: avcodec.h:3203
int av_picture_pad(AVPicture *dst, const AVPicture *src, int height, int width, enum AVPixelFormat pix_fmt, int padtop, int padbottom, int padleft, int padright, int *color)
Pad image.
Definition: imgconvert.c:229
int format
The format of the coded data, corresponds to enum AVPixelFormat for video and for enum AVSampleFormat...
Definition: avcodec.h:4422
int avpicture_get_size(enum AVPixelFormat pix_fmt, int width, int height)
Calculate the size in bytes that a picture of the given width and height would occupy if stored in th...
Definition: avpicture.c:49
unsigned avcodec_version(void)
Return the LIBAVCODEC_VERSION_INT constant.
Definition: utils.c:3201
char * ass
0 terminated ASS/SSA compatible event line.
Definition: avcodec.h:3502
attribute_deprecated int error_rate
Definition: avcodec.h:2966
int mv0_threshold
Note: Value depends upon the compare function used for fullpel ME.
Definition: avcodec.h:1925
int flags2
CODEC_FLAG2_*.
Definition: avcodec.h:1342
AVDiscard
Definition: avcodec.h:660
int64_t dts
Decompression timestamp in AVStream->time_base units; the time at which the packet is decompressed...
Definition: avcodec.h:1161
void avcodec_register(AVCodec *codec)
Register the codec codec and initialize libavcodec.
Definition: utils.c:197
int64_t pts_correction_last_dts
PTS of the last frame.
Definition: avcodec.h:3069
const char * av_packet_side_data_name(enum AVPacketSideDataType type)
Definition: avpacket.c:339
int * slice_offset
slice offsets in the frame in bytes
Definition: avcodec.h:1614
int frame_number
Frame counter, set by libavcodec.
Definition: avcodec.h:2016
int repeat_pict
This field is used for proper frame duration computation in lavf.
Definition: avcodec.h:4265
int max_prediction_order
Definition: avcodec.h:2448
int64_t pts_correction_num_faulty_pts
Current statistics for PTS correction.
Definition: avcodec.h:3066
enum AVFieldOrder field_order
Field order.
Definition: avcodec.h:1982
AVChromaLocation
Location of chroma samples.
Definition: pixfmt.h:542
uint8_t * av_packet_get_side_data(AVPacket *pkt, enum AVPacketSideDataType type, int *size)
Get side information from packet.
Definition: avpacket.c:324
enum AVSampleFormat * sample_fmts
array of supported sample formats, or NULL if unknown, array is terminated by -1
Definition: avcodec.h:3204
attribute_deprecated int lmin
Definition: avcodec.h:2394
int nb_channels
int me_method
Motion estimation algorithm used for video coding.
Definition: avcodec.h:1453
uint8_t * av_packet_new_side_data(AVPacket *pkt, enum AVPacketSideDataType type, int size)
Allocate new information of a packet.
Definition: avpacket.c:299
int debug_mv
debug Code outside libavcodec should access this field using AVOptions
Definition: avcodec.h:2601
int stream_index
Definition: avcodec.h:1164
int(* decode_slice)(AVCodecContext *avctx, const uint8_t *buf, uint32_t buf_size)
Callback for each slice.
Definition: avcodec.h:3365
const char *const * mime_types
MIME type(s) associated with the codec.
Definition: avcodec.h:583
int rc_min_rate
minimum bitrate
Definition: avcodec.h:2334
int(* init)(AVCodecContext *)
Definition: avcodec.h:3251
enum AVSubtitleType type
Definition: avcodec.h:3493
int av_copy_packet_side_data(AVPacket *dst, const AVPacket *src)
Copy packet side data.
Definition: avpacket.c:223
int(* end_frame)(AVCodecContext *avctx)
Called at the end of each frame or field picture.
Definition: avcodec.h:3376
uint64_t request_channel_layout
Request decoder to use this channel layout if it can (0 for default)
Definition: avcodec.h:2053
int me_pre_cmp
motion estimation prepass comparison function
Definition: avcodec.h:1692
AVPixelFormat
Pixel format.
Definition: pixfmt.h:61
This structure stores compressed data.
Definition: avcodec.h:1139
int avcodec_encode_subtitle(AVCodecContext *avctx, uint8_t *buf, int buf_size, const AVSubtitle *sub)
Definition: utils.c:2187
int(* encode2)(AVCodecContext *avctx, AVPacket *avpkt, const AVFrame *frame, int *got_packet_ptr)
Encode data to an AVPacket.
Definition: avcodec.h:3264
int key_frame
Set by parser to 1 for key frames and 0 for non-key frames.
Definition: avcodec.h:4296
int delay
Codec delay.
Definition: avcodec.h:1402
int me_subpel_quality
subpel ME quality
Definition: avcodec.h:1706
int strict_std_compliance
strictly follow the standard (MPEG4, ...).
Definition: avcodec.h:2543
int dts_sync_point
Synchronization point for start of timestamp generation.
Definition: avcodec.h:4327
int64_t pts
Presentation timestamp in AVStream->time_base units; the time at which the decompressed packet will b...
Definition: avcodec.h:1155
enum AVPixelFormat sw_pix_fmt
Nominal unaccelerated pixel format, see AV_PIX_FMT_xxx.
Definition: avcodec.h:3030
A dummy ID pointing at the start of subtitle codecs.
Definition: avcodec.h:504
void * opaque
Private data of the user, can be used to carry app specific stuff.
Definition: avcodec.h:1298
int thread_type
Which multithreading methods to use.
Definition: avcodec.h:2763
AVSubtitleType
Definition: avcodec.h:3461
int avcodec_default_execute(AVCodecContext *c, int(*func)(AVCodecContext *c2, void *arg2), void *arg, int *ret, int count, int size)
Definition: utils.c:1105
discard nothing
Definition: avcodec.h:663
const char * name
Definition: opengl_enc.c:103
This side data should be associated with an audio stream and corresponds to enum AVAudioServiceType.
Definition: avcodec.h:1044
uint8_t * subtitle_header
Header containing style information for text subtitles.
Definition: avcodec.h:2957
int keyint_min
minimum GOP size
Definition: avcodec.h:1894
attribute_deprecated int avcodec_default_get_buffer(AVCodecContext *s, AVFrame *pic)
Definition: utils.c:841
static int width