FFmpeg
 All Data Structures Namespaces Files Functions Variables Typedefs Enumerations Enumerator Macros Groups Pages
avcodec.h
Go to the documentation of this file.
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 libavcodec
47  * Encoding/Decoding Library
48  *
49  * @{
50  *
51  * @defgroup lavc_decoding Decoding
52  * @{
53  * @}
54  *
55  * @defgroup lavc_encoding Encoding
56  * @{
57  * @}
58  *
59  * @defgroup lavc_codec Codecs
60  * @{
61  * @defgroup lavc_codec_native Native Codecs
62  * @{
63  * @}
64  * @defgroup lavc_codec_wrappers External library wrappers
65  * @{
66  * @}
67  * @defgroup lavc_codec_hwaccel Hardware Accelerators bridge
68  * @{
69  * @}
70  * @}
71  * @defgroup lavc_internal Internal
72  * @{
73  * @}
74  * @}
75  */
76 
77 /**
78  * @ingroup libavc
79  * @defgroup lavc_encdec send/receive encoding and decoding API overview
80  * @{
81  *
82  * The avcodec_send_packet()/avcodec_receive_frame()/avcodec_send_frame()/
83  * avcodec_receive_packet() functions provide an encode/decode API, which
84  * decouples input and output.
85  *
86  * The API is very similar for encoding/decoding and audio/video, and works as
87  * follows:
88  * - Set up and open the AVCodecContext as usual.
89  * - Send valid input:
90  * - For decoding, call avcodec_send_packet() to give the decoder raw
91  * compressed data in an AVPacket.
92  * - For encoding, call avcodec_send_frame() to give the encoder an AVFrame
93  * containing uncompressed audio or video.
94  * In both cases, it is recommended that AVPackets and AVFrames are
95  * refcounted, or libavcodec might have to copy the input data. (libavformat
96  * always returns refcounted AVPackets, and av_frame_get_buffer() allocates
97  * refcounted AVFrames.)
98  * - Receive output in a loop. Periodically call one of the avcodec_receive_*()
99  * functions and process their output:
100  * - For decoding, call avcodec_receive_frame(). On success, it will return
101  * an AVFrame containing uncompressed audio or video data.
102  * - For encoding, call avcodec_receive_packet(). On success, it will return
103  * an AVPacket with a compressed frame.
104  * Repeat this call until it returns AVERROR(EAGAIN) or an error. The
105  * AVERROR(EAGAIN) return value means that new input data is required to
106  * return new output. In this case, continue with sending input. For each
107  * input frame/packet, the codec will typically return 1 output frame/packet,
108  * but it can also be 0 or more than 1.
109  *
110  * At the beginning of decoding or encoding, the codec might accept multiple
111  * input frames/packets without returning a frame, until its internal buffers
112  * are filled. This situation is handled transparently if you follow the steps
113  * outlined above.
114  *
115  * In theory, sending input can result in EAGAIN - this should happen only if
116  * not all output was received. You can use this to structure alternative decode
117  * or encode loops other than the one suggested above. For example, you could
118  * try sending new input on each iteration, and try to receive output if that
119  * returns EAGAIN.
120  *
121  * End of stream situations. These require "flushing" (aka draining) the codec,
122  * as the codec might buffer multiple frames or packets internally for
123  * performance or out of necessity (consider B-frames).
124  * This is handled as follows:
125  * - Instead of valid input, send NULL to the avcodec_send_packet() (decoding)
126  * or avcodec_send_frame() (encoding) functions. This will enter draining
127  * mode.
128  * - Call avcodec_receive_frame() (decoding) or avcodec_receive_packet()
129  * (encoding) in a loop until AVERROR_EOF is returned. The functions will
130  * not return AVERROR(EAGAIN), unless you forgot to enter draining mode.
131  * - Before decoding can be resumed again, the codec has to be reset with
132  * avcodec_flush_buffers().
133  *
134  * Using the API as outlined above is highly recommended. But it is also
135  * possible to call functions outside of this rigid schema. For example, you can
136  * call avcodec_send_packet() repeatedly without calling
137  * avcodec_receive_frame(). In this case, avcodec_send_packet() will succeed
138  * until the codec's internal buffer has been filled up (which is typically of
139  * size 1 per output frame, after initial input), and then reject input with
140  * AVERROR(EAGAIN). Once it starts rejecting input, you have no choice but to
141  * read at least some output.
142  *
143  * Not all codecs will follow a rigid and predictable dataflow; the only
144  * guarantee is that an AVERROR(EAGAIN) return value on a send/receive call on
145  * one end implies that a receive/send call on the other end will succeed, or
146  * at least will not fail with AVERROR(EAGAIN). In general, no codec will
147  * permit unlimited buffering of input or output.
148  *
149  * This API replaces the following legacy functions:
150  * - avcodec_decode_video2() and avcodec_decode_audio4():
151  * Use avcodec_send_packet() to feed input to the decoder, then use
152  * avcodec_receive_frame() to receive decoded frames after each packet.
153  * Unlike with the old video decoding API, multiple frames might result from
154  * a packet. For audio, splitting the input packet into frames by partially
155  * decoding packets becomes transparent to the API user. You never need to
156  * feed an AVPacket to the API twice (unless it is rejected with AVERROR(EAGAIN) - then
157  * no data was read from the packet).
158  * Additionally, sending a flush/draining packet is required only once.
159  * - avcodec_encode_video2()/avcodec_encode_audio2():
160  * Use avcodec_send_frame() to feed input to the encoder, then use
161  * avcodec_receive_packet() to receive encoded packets.
162  * Providing user-allocated buffers for avcodec_receive_packet() is not
163  * possible.
164  * - The new API does not handle subtitles yet.
165  *
166  * Mixing new and old function calls on the same AVCodecContext is not allowed,
167  * and will result in undefined behavior.
168  *
169  * Some codecs might require using the new API; using the old API will return
170  * an error when calling it. All codecs support the new API.
171  *
172  * A codec is not allowed to return AVERROR(EAGAIN) for both sending and receiving. This
173  * would be an invalid state, which could put the codec user into an endless
174  * loop. The API has no concept of time either: it cannot happen that trying to
175  * do avcodec_send_packet() results in AVERROR(EAGAIN), but a repeated call 1 second
176  * later accepts the packet (with no other receive/flush API calls involved).
177  * The API is a strict state machine, and the passage of time is not supposed
178  * to influence it. Some timing-dependent behavior might still be deemed
179  * acceptable in certain cases. But it must never result in both send/receive
180  * returning EAGAIN at the same time at any point. It must also absolutely be
181  * avoided that the current state is "unstable" and can "flip-flop" between
182  * the send/receive APIs allowing progress. For example, it's not allowed that
183  * the codec randomly decides that it actually wants to consume a packet now
184  * instead of returning a frame, after it just returned AVERROR(EAGAIN) on an
185  * avcodec_send_packet() call.
186  * @}
187  */
188 
189 /**
190  * @defgroup lavc_core Core functions/structures.
191  * @ingroup libavc
192  *
193  * Basic definitions, functions for querying libavcodec capabilities,
194  * allocating core structures, etc.
195  * @{
196  */
197 
198 
199 /**
200  * Identify the syntax and semantics of the bitstream.
201  * The principle is roughly:
202  * Two decoders with the same ID can decode the same streams.
203  * Two encoders with the same ID can encode compatible streams.
204  * There may be slight deviations from the principle due to implementation
205  * details.
206  *
207  * If you add a codec ID to this list, add it so that
208  * 1. no value of an existing codec ID changes (that would break ABI),
209  * 2. it is as close as possible to similar codecs
210  *
211  * After adding new codec IDs, do not forget to add an entry to the codec
212  * descriptor list and bump libavcodec minor version.
213  */
214 enum AVCodecID {
216 
217  /* video codecs */
219  AV_CODEC_ID_MPEG2VIDEO, ///< preferred ID for MPEG-1/2 video decoding
220 #if FF_API_XVMC
221  AV_CODEC_ID_MPEG2VIDEO_XVMC,
222 #endif /* FF_API_XVMC */
357 #define AV_CODEC_ID_IFF_BYTERUN1 AV_CODEC_ID_IFF_ILBM
395 #define AV_CODEC_ID_H265 AV_CODEC_ID_HEVC
414 
449 
450  /* various PCM "codecs" */
451  AV_CODEC_ID_FIRST_AUDIO = 0x10000, ///< A dummy id pointing at the start of audio codecs
483 
488 
489  /* various ADPCM codecs */
521 #if FF_API_VIMA_DECODER
523 #endif
524 
535 
536  /* AMR */
539 
540  /* RealAudio codecs*/
543 
544  /* various DPCM codecs */
549 
551 
552  /* audio codecs */
553  AV_CODEC_ID_MP2 = 0x15000,
554  AV_CODEC_ID_MP3, ///< preferred ID for decoding MPEG audio layer 1, 2 or 3
571  AV_CODEC_ID_GSM, ///< as in Berlin toast format
583  AV_CODEC_ID_GSM_MS, /* as found in WAV */
585 #if FF_API_VOXWARE
587 #endif
623 
640 
641  /* subtitle codecs */
642  AV_CODEC_ID_FIRST_SUBTITLE = 0x17000, ///< A dummy ID pointing at the start of subtitle codecs.
645  AV_CODEC_ID_TEXT, ///< raw UTF-8 text
652 
668 
669  /* other specific kind of codecs (generally used for attachments) */
670  AV_CODEC_ID_FIRST_UNKNOWN = 0x18000, ///< A dummy ID pointing at the start of various fake codecs.
671  AV_CODEC_ID_TTF = 0x18000,
672 
673  AV_CODEC_ID_SCTE_35, ///< Contain timestamp estimated through PCR of program stream.
682 
683 
684  AV_CODEC_ID_PROBE = 0x19000, ///< codec_id is not known (like AV_CODEC_ID_NONE) but lavf should attempt to identify it
685 
686  AV_CODEC_ID_MPEG2TS = 0x20000, /**< _FAKE_ codec to indicate a raw MPEG-2 TS
687  * stream (only used by libavformat) */
688  AV_CODEC_ID_MPEG4SYSTEMS = 0x20001, /**< _FAKE_ codec to indicate a MPEG-4 Systems
689  * stream (only used by libavformat) */
690  AV_CODEC_ID_FFMETADATA = 0x21000, ///< Dummy codec for streams containing only metadata information.
691  AV_CODEC_ID_WRAPPED_AVFRAME = 0x21001, ///< Passthrough codec, AVFrames wrapped in AVPacket
692 };
693 
694 /**
695  * This struct describes the properties of a single codec described by an
696  * AVCodecID.
697  * @see avcodec_descriptor_get()
698  */
699 typedef struct AVCodecDescriptor {
700  enum AVCodecID id;
702  /**
703  * Name of the codec described by this descriptor. It is non-empty and
704  * unique for each codec descriptor. It should contain alphanumeric
705  * characters and '_' only.
706  */
707  const char *name;
708  /**
709  * A more descriptive name for this codec. May be NULL.
710  */
711  const char *long_name;
712  /**
713  * Codec properties, a combination of AV_CODEC_PROP_* flags.
714  */
715  int props;
716  /**
717  * MIME type(s) associated with the codec.
718  * May be NULL; if not, a NULL-terminated array of MIME types.
719  * The first item is always non-NULL and is the preferred MIME type.
720  */
721  const char *const *mime_types;
722  /**
723  * If non-NULL, an array of profiles recognized for this codec.
724  * Terminated with FF_PROFILE_UNKNOWN.
725  */
726  const struct AVProfile *profiles;
728 
729 /**
730  * Codec uses only intra compression.
731  * Video and audio codecs only.
732  */
733 #define AV_CODEC_PROP_INTRA_ONLY (1 << 0)
734 /**
735  * Codec supports lossy compression. Audio and video codecs only.
736  * @note a codec may support both lossy and lossless
737  * compression modes
738  */
739 #define AV_CODEC_PROP_LOSSY (1 << 1)
740 /**
741  * Codec supports lossless compression. Audio and video codecs only.
742  */
743 #define AV_CODEC_PROP_LOSSLESS (1 << 2)
744 /**
745  * Codec supports frame reordering. That is, the coded order (the order in which
746  * the encoded packets are output by the encoders / stored / input to the
747  * decoders) may be different from the presentation order of the corresponding
748  * frames.
749  *
750  * For codecs that do not have this property set, PTS and DTS should always be
751  * equal.
752  */
753 #define AV_CODEC_PROP_REORDER (1 << 3)
754 /**
755  * Subtitle codec is bitmap based
756  * Decoded AVSubtitle data can be read from the AVSubtitleRect->pict field.
757  */
758 #define AV_CODEC_PROP_BITMAP_SUB (1 << 16)
759 /**
760  * Subtitle codec is text based.
761  * Decoded AVSubtitle data can be read from the AVSubtitleRect->ass field.
762  */
763 #define AV_CODEC_PROP_TEXT_SUB (1 << 17)
764 
765 /**
766  * @ingroup lavc_decoding
767  * Required number of additionally allocated bytes at the end of the input bitstream for decoding.
768  * This is mainly needed because some optimized bitstream readers read
769  * 32 or 64 bit at once and could read over the end.<br>
770  * Note: If the first 23 bits of the additional bytes are not 0, then damaged
771  * MPEG bitstreams could cause overread and segfault.
772  */
773 #define AV_INPUT_BUFFER_PADDING_SIZE 32
774 
775 /**
776  * @ingroup lavc_encoding
777  * minimum encoding buffer size
778  * Used to avoid some checks during header writing.
779  */
780 #define AV_INPUT_BUFFER_MIN_SIZE 16384
781 
782 #if FF_API_WITHOUT_PREFIX
783 /**
784  * @deprecated use AV_INPUT_BUFFER_PADDING_SIZE instead
785  */
786 #define FF_INPUT_BUFFER_PADDING_SIZE 32
787 
788 /**
789  * @deprecated use AV_INPUT_BUFFER_MIN_SIZE instead
790  */
791 #define FF_MIN_BUFFER_SIZE 16384
792 #endif /* FF_API_WITHOUT_PREFIX */
793 
794 /**
795  * @ingroup lavc_encoding
796  * motion estimation type.
797  * @deprecated use codec private option instead
798  */
799 #if FF_API_MOTION_EST
801  ME_ZERO = 1, ///< no search, that is use 0,0 vector whenever one is needed
805  ME_EPZS, ///< enhanced predictive zonal search
806  ME_X1, ///< reserved for experiments
807  ME_HEX, ///< hexagon based search
808  ME_UMH, ///< uneven multi-hexagon search
809  ME_TESA, ///< transformed exhaustive search algorithm
810  ME_ITER=50, ///< iterative search
811 };
812 #endif
813 
814 /**
815  * @ingroup lavc_decoding
816  */
818  /* We leave some space between them for extensions (drop some
819  * keyframes for intra-only or drop just some bidir frames). */
820  AVDISCARD_NONE =-16, ///< discard nothing
821  AVDISCARD_DEFAULT = 0, ///< discard useless packets like 0 size packets in avi
822  AVDISCARD_NONREF = 8, ///< discard all non reference
823  AVDISCARD_BIDIR = 16, ///< discard all bidirectional frames
824  AVDISCARD_NONINTRA= 24, ///< discard all non intra frames
825  AVDISCARD_NONKEY = 32, ///< discard all frames except keyframes
826  AVDISCARD_ALL = 48, ///< discard all
827 };
828 
839  AV_AUDIO_SERVICE_TYPE_NB , ///< Not part of ABI
840 };
841 
842 /**
843  * @ingroup lavc_encoding
844  */
845 typedef struct RcOverride{
848  int qscale; // If this is 0 then quality_factor will be used instead.
850 } RcOverride;
851 
852 #if FF_API_MAX_BFRAMES
853 /**
854  * @deprecated there is no libavcodec-wide limit on the number of B-frames
855  */
856 #define FF_MAX_B_FRAMES 16
857 #endif
858 
859 /* encoding support
860  These flags can be passed in AVCodecContext.flags before initialization.
861  Note: Not everything is supported yet.
862 */
863 
864 /**
865  * Allow decoders to produce frames with data planes that are not aligned
866  * to CPU requirements (e.g. due to cropping).
867  */
868 #define AV_CODEC_FLAG_UNALIGNED (1 << 0)
869 /**
870  * Use fixed qscale.
871  */
872 #define AV_CODEC_FLAG_QSCALE (1 << 1)
873 /**
874  * 4 MV per MB allowed / advanced prediction for H.263.
875  */
876 #define AV_CODEC_FLAG_4MV (1 << 2)
877 /**
878  * Output even those frames that might be corrupted.
879  */
880 #define AV_CODEC_FLAG_OUTPUT_CORRUPT (1 << 3)
881 /**
882  * Use qpel MC.
883  */
884 #define AV_CODEC_FLAG_QPEL (1 << 4)
885 /**
886  * Use internal 2pass ratecontrol in first pass mode.
887  */
888 #define AV_CODEC_FLAG_PASS1 (1 << 9)
889 /**
890  * Use internal 2pass ratecontrol in second pass mode.
891  */
892 #define AV_CODEC_FLAG_PASS2 (1 << 10)
893 /**
894  * loop filter.
895  */
896 #define AV_CODEC_FLAG_LOOP_FILTER (1 << 11)
897 /**
898  * Only decode/encode grayscale.
899  */
900 #define AV_CODEC_FLAG_GRAY (1 << 13)
901 /**
902  * error[?] variables will be set during encoding.
903  */
904 #define AV_CODEC_FLAG_PSNR (1 << 15)
905 /**
906  * Input bitstream might be truncated at a random location
907  * instead of only at frame boundaries.
908  */
909 #define AV_CODEC_FLAG_TRUNCATED (1 << 16)
910 /**
911  * Use interlaced DCT.
912  */
913 #define AV_CODEC_FLAG_INTERLACED_DCT (1 << 18)
914 /**
915  * Force low delay.
916  */
917 #define AV_CODEC_FLAG_LOW_DELAY (1 << 19)
918 /**
919  * Place global headers in extradata instead of every keyframe.
920  */
921 #define AV_CODEC_FLAG_GLOBAL_HEADER (1 << 22)
922 /**
923  * Use only bitexact stuff (except (I)DCT).
924  */
925 #define AV_CODEC_FLAG_BITEXACT (1 << 23)
926 /* Fx : Flag for H.263+ extra options */
927 /**
928  * H.263 advanced intra coding / MPEG-4 AC prediction
929  */
930 #define AV_CODEC_FLAG_AC_PRED (1 << 24)
931 /**
932  * interlaced motion estimation
933  */
934 #define AV_CODEC_FLAG_INTERLACED_ME (1 << 29)
935 #define AV_CODEC_FLAG_CLOSED_GOP (1U << 31)
936 
937 /**
938  * Allow non spec compliant speedup tricks.
939  */
940 #define AV_CODEC_FLAG2_FAST (1 << 0)
941 /**
942  * Skip bitstream encoding.
943  */
944 #define AV_CODEC_FLAG2_NO_OUTPUT (1 << 2)
945 /**
946  * Place global headers at every keyframe instead of in extradata.
947  */
948 #define AV_CODEC_FLAG2_LOCAL_HEADER (1 << 3)
949 
950 /**
951  * timecode is in drop frame format. DEPRECATED!!!!
952  */
953 #define AV_CODEC_FLAG2_DROP_FRAME_TIMECODE (1 << 13)
954 
955 /**
956  * Input bitstream might be truncated at a packet boundaries
957  * instead of only at frame boundaries.
958  */
959 #define AV_CODEC_FLAG2_CHUNKS (1 << 15)
960 /**
961  * Discard cropping information from SPS.
962  */
963 #define AV_CODEC_FLAG2_IGNORE_CROP (1 << 16)
964 
965 /**
966  * Show all frames before the first keyframe
967  */
968 #define AV_CODEC_FLAG2_SHOW_ALL (1 << 22)
969 /**
970  * Export motion vectors through frame side data
971  */
972 #define AV_CODEC_FLAG2_EXPORT_MVS (1 << 28)
973 /**
974  * Do not skip samples and export skip information as frame side data
975  */
976 #define AV_CODEC_FLAG2_SKIP_MANUAL (1 << 29)
977 /**
978  * Do not reset ASS ReadOrder field on flush (subtitles decoding)
979  */
980 #define AV_CODEC_FLAG2_RO_FLUSH_NOOP (1 << 30)
981 
982 /* Unsupported options :
983  * Syntax Arithmetic coding (SAC)
984  * Reference Picture Selection
985  * Independent Segment Decoding */
986 /* /Fx */
987 /* codec capabilities */
988 
989 /**
990  * Decoder can use draw_horiz_band callback.
991  */
992 #define AV_CODEC_CAP_DRAW_HORIZ_BAND (1 << 0)
993 /**
994  * Codec uses get_buffer() for allocating buffers and supports custom allocators.
995  * If not set, it might not use get_buffer() at all or use operations that
996  * assume the buffer was allocated by avcodec_default_get_buffer.
997  */
998 #define AV_CODEC_CAP_DR1 (1 << 1)
999 #define AV_CODEC_CAP_TRUNCATED (1 << 3)
1000 /**
1001  * Encoder or decoder requires flushing with NULL input at the end in order to
1002  * give the complete and correct output.
1003  *
1004  * NOTE: If this flag is not set, the codec is guaranteed to never be fed with
1005  * with NULL data. The user can still send NULL data to the public encode
1006  * or decode function, but libavcodec will not pass it along to the codec
1007  * unless this flag is set.
1008  *
1009  * Decoders:
1010  * The decoder has a non-zero delay and needs to be fed with avpkt->data=NULL,
1011  * avpkt->size=0 at the end to get the delayed data until the decoder no longer
1012  * returns frames.
1013  *
1014  * Encoders:
1015  * The encoder needs to be fed with NULL data at the end of encoding until the
1016  * encoder no longer returns data.
1017  *
1018  * NOTE: For encoders implementing the AVCodec.encode2() function, setting this
1019  * flag also means that the encoder must set the pts and duration for
1020  * each output packet. If this flag is not set, the pts and duration will
1021  * be determined by libavcodec from the input frame.
1022  */
1023 #define AV_CODEC_CAP_DELAY (1 << 5)
1024 /**
1025  * Codec can be fed a final frame with a smaller size.
1026  * This can be used to prevent truncation of the last audio samples.
1027  */
1028 #define AV_CODEC_CAP_SMALL_LAST_FRAME (1 << 6)
1029 
1030 #if FF_API_CAP_VDPAU
1031 /**
1032  * Codec can export data for HW decoding (VDPAU).
1033  */
1034 #define AV_CODEC_CAP_HWACCEL_VDPAU (1 << 7)
1035 #endif
1036 
1037 /**
1038  * Codec can output multiple frames per AVPacket
1039  * Normally demuxers return one frame at a time, demuxers which do not do
1040  * are connected to a parser to split what they return into proper frames.
1041  * This flag is reserved to the very rare category of codecs which have a
1042  * bitstream that cannot be split into frames without timeconsuming
1043  * operations like full decoding. Demuxers carrying such bitstreams thus
1044  * may return multiple frames in a packet. This has many disadvantages like
1045  * prohibiting stream copy in many cases thus it should only be considered
1046  * as a last resort.
1047  */
1048 #define AV_CODEC_CAP_SUBFRAMES (1 << 8)
1049 /**
1050  * Codec is experimental and is thus avoided in favor of non experimental
1051  * encoders
1052  */
1053 #define AV_CODEC_CAP_EXPERIMENTAL (1 << 9)
1054 /**
1055  * Codec should fill in channel configuration and samplerate instead of container
1056  */
1057 #define AV_CODEC_CAP_CHANNEL_CONF (1 << 10)
1058 /**
1059  * Codec supports frame-level multithreading.
1060  */
1061 #define AV_CODEC_CAP_FRAME_THREADS (1 << 12)
1062 /**
1063  * Codec supports slice-based (or partition-based) multithreading.
1064  */
1065 #define AV_CODEC_CAP_SLICE_THREADS (1 << 13)
1066 /**
1067  * Codec supports changed parameters at any point.
1068  */
1069 #define AV_CODEC_CAP_PARAM_CHANGE (1 << 14)
1070 /**
1071  * Codec supports avctx->thread_count == 0 (auto).
1072  */
1073 #define AV_CODEC_CAP_AUTO_THREADS (1 << 15)
1074 /**
1075  * Audio encoder supports receiving a different number of samples in each call.
1076  */
1077 #define AV_CODEC_CAP_VARIABLE_FRAME_SIZE (1 << 16)
1078 /**
1079  * Decoder is not a preferred choice for probing.
1080  * This indicates that the decoder is not a good choice for probing.
1081  * It could for example be an expensive to spin up hardware decoder,
1082  * or it could simply not provide a lot of useful information about
1083  * the stream.
1084  * A decoder marked with this flag should only be used as last resort
1085  * choice for probing.
1086  */
1087 #define AV_CODEC_CAP_AVOID_PROBING (1 << 17)
1088 /**
1089  * Codec is intra only.
1090  */
1091 #define AV_CODEC_CAP_INTRA_ONLY 0x40000000
1092 /**
1093  * Codec is lossless.
1094  */
1095 #define AV_CODEC_CAP_LOSSLESS 0x80000000
1096 
1097 
1098 #if FF_API_WITHOUT_PREFIX
1099 /**
1100  * Allow decoders to produce frames with data planes that are not aligned
1101  * to CPU requirements (e.g. due to cropping).
1102  */
1103 #define CODEC_FLAG_UNALIGNED AV_CODEC_FLAG_UNALIGNED
1104 #define CODEC_FLAG_QSCALE AV_CODEC_FLAG_QSCALE
1105 #define CODEC_FLAG_4MV AV_CODEC_FLAG_4MV
1106 #define CODEC_FLAG_OUTPUT_CORRUPT AV_CODEC_FLAG_OUTPUT_CORRUPT
1107 #define CODEC_FLAG_QPEL AV_CODEC_FLAG_QPEL
1108 #if FF_API_GMC
1109 /**
1110  * @deprecated use the "gmc" private option of the libxvid encoder
1111  */
1112 #define CODEC_FLAG_GMC 0x0020 ///< Use GMC.
1113 #endif
1114 #if FF_API_MV0
1115 /**
1116  * @deprecated use the flag "mv0" in the "mpv_flags" private option of the
1117  * mpegvideo encoders
1118  */
1119 #define CODEC_FLAG_MV0 0x0040
1120 #endif
1121 #if FF_API_INPUT_PRESERVED
1122 /**
1123  * @deprecated passing reference-counted frames to the encoders replaces this
1124  * flag
1125  */
1126 #define CODEC_FLAG_INPUT_PRESERVED 0x0100
1127 #endif
1128 #define CODEC_FLAG_PASS1 AV_CODEC_FLAG_PASS1
1129 #define CODEC_FLAG_PASS2 AV_CODEC_FLAG_PASS2
1130 #define CODEC_FLAG_GRAY AV_CODEC_FLAG_GRAY
1131 #if FF_API_EMU_EDGE
1132 /**
1133  * @deprecated edges are not used/required anymore. I.e. this flag is now always
1134  * set.
1135  */
1136 #define CODEC_FLAG_EMU_EDGE 0x4000
1137 #endif
1138 #define CODEC_FLAG_PSNR AV_CODEC_FLAG_PSNR
1139 #define CODEC_FLAG_TRUNCATED AV_CODEC_FLAG_TRUNCATED
1140 
1141 #if FF_API_NORMALIZE_AQP
1142 /**
1143  * @deprecated use the flag "naq" in the "mpv_flags" private option of the
1144  * mpegvideo encoders
1145  */
1146 #define CODEC_FLAG_NORMALIZE_AQP 0x00020000
1147 #endif
1148 #define CODEC_FLAG_INTERLACED_DCT AV_CODEC_FLAG_INTERLACED_DCT
1149 #define CODEC_FLAG_LOW_DELAY AV_CODEC_FLAG_LOW_DELAY
1150 #define CODEC_FLAG_GLOBAL_HEADER AV_CODEC_FLAG_GLOBAL_HEADER
1151 #define CODEC_FLAG_BITEXACT AV_CODEC_FLAG_BITEXACT
1152 #define CODEC_FLAG_AC_PRED AV_CODEC_FLAG_AC_PRED
1153 #define CODEC_FLAG_LOOP_FILTER AV_CODEC_FLAG_LOOP_FILTER
1154 #define CODEC_FLAG_INTERLACED_ME AV_CODEC_FLAG_INTERLACED_ME
1155 #define CODEC_FLAG_CLOSED_GOP AV_CODEC_FLAG_CLOSED_GOP
1156 #define CODEC_FLAG2_FAST AV_CODEC_FLAG2_FAST
1157 #define CODEC_FLAG2_NO_OUTPUT AV_CODEC_FLAG2_NO_OUTPUT
1158 #define CODEC_FLAG2_LOCAL_HEADER AV_CODEC_FLAG2_LOCAL_HEADER
1159 #define CODEC_FLAG2_DROP_FRAME_TIMECODE AV_CODEC_FLAG2_DROP_FRAME_TIMECODE
1160 #define CODEC_FLAG2_IGNORE_CROP AV_CODEC_FLAG2_IGNORE_CROP
1161 
1162 #define CODEC_FLAG2_CHUNKS AV_CODEC_FLAG2_CHUNKS
1163 #define CODEC_FLAG2_SHOW_ALL AV_CODEC_FLAG2_SHOW_ALL
1164 #define CODEC_FLAG2_EXPORT_MVS AV_CODEC_FLAG2_EXPORT_MVS
1165 #define CODEC_FLAG2_SKIP_MANUAL AV_CODEC_FLAG2_SKIP_MANUAL
1166 
1167 /* Unsupported options :
1168  * Syntax Arithmetic coding (SAC)
1169  * Reference Picture Selection
1170  * Independent Segment Decoding */
1171 /* /Fx */
1172 /* codec capabilities */
1173 
1174 #define CODEC_CAP_DRAW_HORIZ_BAND AV_CODEC_CAP_DRAW_HORIZ_BAND ///< Decoder can use draw_horiz_band callback.
1175 /**
1176  * Codec uses get_buffer() for allocating buffers and supports custom allocators.
1177  * If not set, it might not use get_buffer() at all or use operations that
1178  * assume the buffer was allocated by avcodec_default_get_buffer.
1179  */
1180 #define CODEC_CAP_DR1 AV_CODEC_CAP_DR1
1181 #define CODEC_CAP_TRUNCATED AV_CODEC_CAP_TRUNCATED
1182 #if FF_API_XVMC
1183 /* Codec can export data for HW decoding. This flag indicates that
1184  * the codec would call get_format() with list that might contain HW accelerated
1185  * pixel formats (XvMC, VDPAU, VAAPI, etc). The application can pick any of them
1186  * including raw image format.
1187  * The application can use the passed context to determine bitstream version,
1188  * chroma format, resolution etc.
1189  */
1190 #define CODEC_CAP_HWACCEL 0x0010
1191 #endif /* FF_API_XVMC */
1192 /**
1193  * Encoder or decoder requires flushing with NULL input at the end in order to
1194  * give the complete and correct output.
1195  *
1196  * NOTE: If this flag is not set, the codec is guaranteed to never be fed with
1197  * with NULL data. The user can still send NULL data to the public encode
1198  * or decode function, but libavcodec will not pass it along to the codec
1199  * unless this flag is set.
1200  *
1201  * Decoders:
1202  * The decoder has a non-zero delay and needs to be fed with avpkt->data=NULL,
1203  * avpkt->size=0 at the end to get the delayed data until the decoder no longer
1204  * returns frames.
1205  *
1206  * Encoders:
1207  * The encoder needs to be fed with NULL data at the end of encoding until the
1208  * encoder no longer returns data.
1209  *
1210  * NOTE: For encoders implementing the AVCodec.encode2() function, setting this
1211  * flag also means that the encoder must set the pts and duration for
1212  * each output packet. If this flag is not set, the pts and duration will
1213  * be determined by libavcodec from the input frame.
1214  */
1215 #define CODEC_CAP_DELAY AV_CODEC_CAP_DELAY
1216 /**
1217  * Codec can be fed a final frame with a smaller size.
1218  * This can be used to prevent truncation of the last audio samples.
1219  */
1220 #define CODEC_CAP_SMALL_LAST_FRAME AV_CODEC_CAP_SMALL_LAST_FRAME
1221 #if FF_API_CAP_VDPAU
1222 /**
1223  * Codec can export data for HW decoding (VDPAU).
1224  */
1225 #define CODEC_CAP_HWACCEL_VDPAU AV_CODEC_CAP_HWACCEL_VDPAU
1226 #endif
1227 /**
1228  * Codec can output multiple frames per AVPacket
1229  * Normally demuxers return one frame at a time, demuxers which do not do
1230  * are connected to a parser to split what they return into proper frames.
1231  * This flag is reserved to the very rare category of codecs which have a
1232  * bitstream that cannot be split into frames without timeconsuming
1233  * operations like full decoding. Demuxers carrying such bitstreams thus
1234  * may return multiple frames in a packet. This has many disadvantages like
1235  * prohibiting stream copy in many cases thus it should only be considered
1236  * as a last resort.
1237  */
1238 #define CODEC_CAP_SUBFRAMES AV_CODEC_CAP_SUBFRAMES
1239 /**
1240  * Codec is experimental and is thus avoided in favor of non experimental
1241  * encoders
1242  */
1243 #define CODEC_CAP_EXPERIMENTAL AV_CODEC_CAP_EXPERIMENTAL
1244 /**
1245  * Codec should fill in channel configuration and samplerate instead of container
1246  */
1247 #define CODEC_CAP_CHANNEL_CONF AV_CODEC_CAP_CHANNEL_CONF
1248 #if FF_API_NEG_LINESIZES
1249 /**
1250  * @deprecated no codecs use this capability
1251  */
1252 #define CODEC_CAP_NEG_LINESIZES 0x0800
1253 #endif
1254 /**
1255  * Codec supports frame-level multithreading.
1256  */
1257 #define CODEC_CAP_FRAME_THREADS AV_CODEC_CAP_FRAME_THREADS
1258 /**
1259  * Codec supports slice-based (or partition-based) multithreading.
1260  */
1261 #define CODEC_CAP_SLICE_THREADS AV_CODEC_CAP_SLICE_THREADS
1262 /**
1263  * Codec supports changed parameters at any point.
1264  */
1265 #define CODEC_CAP_PARAM_CHANGE AV_CODEC_CAP_PARAM_CHANGE
1266 /**
1267  * Codec supports avctx->thread_count == 0 (auto).
1268  */
1269 #define CODEC_CAP_AUTO_THREADS AV_CODEC_CAP_AUTO_THREADS
1270 /**
1271  * Audio encoder supports receiving a different number of samples in each call.
1272  */
1273 #define CODEC_CAP_VARIABLE_FRAME_SIZE AV_CODEC_CAP_VARIABLE_FRAME_SIZE
1274 /**
1275  * Codec is intra only.
1276  */
1277 #define CODEC_CAP_INTRA_ONLY AV_CODEC_CAP_INTRA_ONLY
1278 /**
1279  * Codec is lossless.
1280  */
1281 #define CODEC_CAP_LOSSLESS AV_CODEC_CAP_LOSSLESS
1282 
1283 /**
1284  * HWAccel is experimental and is thus avoided in favor of non experimental
1285  * codecs
1286  */
1287 #define HWACCEL_CODEC_CAP_EXPERIMENTAL 0x0200
1288 #endif /* FF_API_WITHOUT_PREFIX */
1289 
1290 #if FF_API_MB_TYPE
1291 //The following defines may change, don't expect compatibility if you use them.
1292 #define MB_TYPE_INTRA4x4 0x0001
1293 #define MB_TYPE_INTRA16x16 0x0002 //FIXME H.264-specific
1294 #define MB_TYPE_INTRA_PCM 0x0004 //FIXME H.264-specific
1295 #define MB_TYPE_16x16 0x0008
1296 #define MB_TYPE_16x8 0x0010
1297 #define MB_TYPE_8x16 0x0020
1298 #define MB_TYPE_8x8 0x0040
1299 #define MB_TYPE_INTERLACED 0x0080
1300 #define MB_TYPE_DIRECT2 0x0100 //FIXME
1301 #define MB_TYPE_ACPRED 0x0200
1302 #define MB_TYPE_GMC 0x0400
1303 #define MB_TYPE_SKIP 0x0800
1304 #define MB_TYPE_P0L0 0x1000
1305 #define MB_TYPE_P1L0 0x2000
1306 #define MB_TYPE_P0L1 0x4000
1307 #define MB_TYPE_P1L1 0x8000
1308 #define MB_TYPE_L0 (MB_TYPE_P0L0 | MB_TYPE_P1L0)
1309 #define MB_TYPE_L1 (MB_TYPE_P0L1 | MB_TYPE_P1L1)
1310 #define MB_TYPE_L0L1 (MB_TYPE_L0 | MB_TYPE_L1)
1311 #define MB_TYPE_QUANT 0x00010000
1312 #define MB_TYPE_CBP 0x00020000
1313 // Note bits 24-31 are reserved for codec specific use (H.264 ref0, MPEG-1 0mv, ...)
1314 #endif
1315 
1316 /**
1317  * Pan Scan area.
1318  * This specifies the area which should be displayed.
1319  * Note there may be multiple such areas for one frame.
1320  */
1321 typedef struct AVPanScan{
1322  /**
1323  * id
1324  * - encoding: Set by user.
1325  * - decoding: Set by libavcodec.
1326  */
1327  int id;
1328 
1329  /**
1330  * width and height in 1/16 pel
1331  * - encoding: Set by user.
1332  * - decoding: Set by libavcodec.
1333  */
1334  int width;
1335  int height;
1336 
1337  /**
1338  * position of the top left corner in 1/16 pel for up to 3 fields/frames
1339  * - encoding: Set by user.
1340  * - decoding: Set by libavcodec.
1341  */
1342  int16_t position[3][2];
1343 }AVPanScan;
1344 
1345 /**
1346  * This structure describes the bitrate properties of an encoded bitstream. It
1347  * roughly corresponds to a subset the VBV parameters for MPEG-2 or HRD
1348  * parameters for H.264/HEVC.
1349  */
1350 typedef struct AVCPBProperties {
1351  /**
1352  * Maximum bitrate of the stream, in bits per second.
1353  * Zero if unknown or unspecified.
1354  */
1356  /**
1357  * Minimum bitrate of the stream, in bits per second.
1358  * Zero if unknown or unspecified.
1359  */
1361  /**
1362  * Average bitrate of the stream, in bits per second.
1363  * Zero if unknown or unspecified.
1364  */
1366 
1367  /**
1368  * The size of the buffer to which the ratecontrol is applied, in bits.
1369  * Zero if unknown or unspecified.
1370  */
1372 
1373  /**
1374  * The delay between the time the packet this structure is associated with
1375  * is received and the time when it should be decoded, in periods of a 27MHz
1376  * clock.
1377  *
1378  * UINT64_MAX when unknown or unspecified.
1379  */
1380  uint64_t vbv_delay;
1381 } AVCPBProperties;
1382 
1383 #if FF_API_QSCALE_TYPE
1384 #define FF_QSCALE_TYPE_MPEG1 0
1385 #define FF_QSCALE_TYPE_MPEG2 1
1386 #define FF_QSCALE_TYPE_H264 2
1387 #define FF_QSCALE_TYPE_VP56 3
1388 #endif
1389 
1390 /**
1391  * The decoder will keep a reference to the frame and may reuse it later.
1392  */
1393 #define AV_GET_BUFFER_FLAG_REF (1 << 0)
1394 
1395 /**
1396  * @defgroup lavc_packet AVPacket
1397  *
1398  * Types and functions for working with AVPacket.
1399  * @{
1400  */
1402  /**
1403  * An AV_PKT_DATA_PALETTE side data packet contains exactly AVPALETTE_SIZE
1404  * bytes worth of palette. This side data signals that a new palette is
1405  * present.
1406  */
1408 
1409  /**
1410  * The AV_PKT_DATA_NEW_EXTRADATA is used to notify the codec or the format
1411  * that the extradata buffer was changed and the receiving side should
1412  * act upon it appropriately. The new extradata is embedded in the side
1413  * data buffer and should be immediately used for processing the current
1414  * frame or packet.
1415  */
1417 
1418  /**
1419  * An AV_PKT_DATA_PARAM_CHANGE side data packet is laid out as follows:
1420  * @code
1421  * u32le param_flags
1422  * if (param_flags & AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_COUNT)
1423  * s32le channel_count
1424  * if (param_flags & AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_LAYOUT)
1425  * u64le channel_layout
1426  * if (param_flags & AV_SIDE_DATA_PARAM_CHANGE_SAMPLE_RATE)
1427  * s32le sample_rate
1428  * if (param_flags & AV_SIDE_DATA_PARAM_CHANGE_DIMENSIONS)
1429  * s32le width
1430  * s32le height
1431  * @endcode
1432  */
1434 
1435  /**
1436  * An AV_PKT_DATA_H263_MB_INFO side data packet contains a number of
1437  * structures with info about macroblocks relevant to splitting the
1438  * packet into smaller packets on macroblock edges (e.g. as for RFC 2190).
1439  * That is, it does not necessarily contain info about all macroblocks,
1440  * as long as the distance between macroblocks in the info is smaller
1441  * than the target payload size.
1442  * Each MB info structure is 12 bytes, and is laid out as follows:
1443  * @code
1444  * u32le bit offset from the start of the packet
1445  * u8 current quantizer at the start of the macroblock
1446  * u8 GOB number
1447  * u16le macroblock address within the GOB
1448  * u8 horizontal MV predictor
1449  * u8 vertical MV predictor
1450  * u8 horizontal MV predictor for block number 3
1451  * u8 vertical MV predictor for block number 3
1452  * @endcode
1453  */
1455 
1456  /**
1457  * This side data should be associated with an audio stream and contains
1458  * ReplayGain information in form of the AVReplayGain struct.
1459  */
1461 
1462  /**
1463  * This side data contains a 3x3 transformation matrix describing an affine
1464  * transformation that needs to be applied to the decoded video frames for
1465  * correct presentation.
1466  *
1467  * See libavutil/display.h for a detailed description of the data.
1468  */
1470 
1471  /**
1472  * This side data should be associated with a video stream and contains
1473  * Stereoscopic 3D information in form of the AVStereo3D struct.
1474  */
1476 
1477  /**
1478  * This side data should be associated with an audio stream and corresponds
1479  * to enum AVAudioServiceType.
1480  */
1482 
1483  /**
1484  * This side data contains quality related information from the encoder.
1485  * @code
1486  * u32le quality factor of the compressed frame. Allowed range is between 1 (good) and FF_LAMBDA_MAX (bad).
1487  * u8 picture type
1488  * u8 error count
1489  * u16 reserved
1490  * u64le[error count] sum of squared differences between encoder in and output
1491  * @endcode
1492  */
1494 
1495  /**
1496  * This side data contains an integer value representing the stream index
1497  * of a "fallback" track. A fallback track indicates an alternate
1498  * track to use when the current track can not be decoded for some reason.
1499  * e.g. no decoder available for codec.
1500  */
1502 
1503  /**
1504  * This side data corresponds to the AVCPBProperties struct.
1505  */
1507 
1508  /**
1509  * Recommmends skipping the specified number of samples
1510  * @code
1511  * u32le number of samples to skip from start of this packet
1512  * u32le number of samples to skip from end of this packet
1513  * u8 reason for start skip
1514  * u8 reason for end skip (0=padding silence, 1=convergence)
1515  * @endcode
1516  */
1518 
1519  /**
1520  * An AV_PKT_DATA_JP_DUALMONO side data packet indicates that
1521  * the packet may contain "dual mono" audio specific to Japanese DTV
1522  * and if it is true, recommends only the selected channel to be used.
1523  * @code
1524  * u8 selected channels (0=mail/left, 1=sub/right, 2=both)
1525  * @endcode
1526  */
1528 
1529  /**
1530  * A list of zero terminated key/value strings. There is no end marker for
1531  * the list, so it is required to rely on the side data size to stop.
1532  */
1534 
1535  /**
1536  * Subtitle event position
1537  * @code
1538  * u32le x1
1539  * u32le y1
1540  * u32le x2
1541  * u32le y2
1542  * @endcode
1543  */
1545 
1546  /**
1547  * Data found in BlockAdditional element of matroska container. There is
1548  * no end marker for the data, so it is required to rely on the side data
1549  * size to recognize the end. 8 byte id (as found in BlockAddId) followed
1550  * by data.
1551  */
1553 
1554  /**
1555  * The optional first identifier line of a WebVTT cue.
1556  */
1558 
1559  /**
1560  * The optional settings (rendering instructions) that immediately
1561  * follow the timestamp specifier of a WebVTT cue.
1562  */
1564 
1565  /**
1566  * A list of zero terminated key/value strings. There is no end marker for
1567  * the list, so it is required to rely on the side data size to stop. This
1568  * side data includes updated metadata which appeared in the stream.
1569  */
1571 
1572  /**
1573  * MPEGTS stream ID, this is required to pass the stream ID
1574  * information from the demuxer to the corresponding muxer.
1575  */
1577 
1578  /**
1579  * Mastering display metadata (based on SMPTE-2086:2014). This metadata
1580  * should be associated with a video stream and contains data in the form
1581  * of the AVMasteringDisplayMetadata struct.
1582  */
1584 
1585  /**
1586  * This side data should be associated with a video stream and corresponds
1587  * to the AVSphericalMapping structure.
1588  */
1590 
1591  /**
1592  * Content light level (based on CTA-861.3). This metadata should be
1593  * associated with a video stream and contains data in the form of the
1594  * AVContentLightMetadata struct.
1595  */
1597 
1598  /**
1599  * The number of side data elements (in fact a bit more than it).
1600  * This is not part of the public API/ABI in the sense that it may
1601  * change when new side data types are added.
1602  * This must stay the last enum value.
1603  * If its value becomes huge, some code using it
1604  * needs to be updated as it assumes it to be smaller than other limits.
1605  */
1607 };
1608 
1609 #define AV_PKT_DATA_QUALITY_FACTOR AV_PKT_DATA_QUALITY_STATS //DEPRECATED
1610 
1611 typedef struct AVPacketSideData {
1613  int size;
1616 
1617 /**
1618  * This structure stores compressed data. It is typically exported by demuxers
1619  * and then passed as input to decoders, or received as output from encoders and
1620  * then passed to muxers.
1621  *
1622  * For video, it should typically contain one compressed frame. For audio it may
1623  * contain several compressed frames. Encoders are allowed to output empty
1624  * packets, with no compressed data, containing only side data
1625  * (e.g. to update some stream parameters at the end of encoding).
1626  *
1627  * AVPacket is one of the few structs in FFmpeg, whose size is a part of public
1628  * ABI. Thus it may be allocated on stack and no new fields can be added to it
1629  * without libavcodec and libavformat major bump.
1630  *
1631  * The semantics of data ownership depends on the buf field.
1632  * If it is set, the packet data is dynamically allocated and is
1633  * valid indefinitely until a call to av_packet_unref() reduces the
1634  * reference count to 0.
1635  *
1636  * If the buf field is not set av_packet_ref() would make a copy instead
1637  * of increasing the reference count.
1638  *
1639  * The side data is always allocated with av_malloc(), copied by
1640  * av_packet_ref() and freed by av_packet_unref().
1641  *
1642  * @see av_packet_ref
1643  * @see av_packet_unref
1644  */
1645 typedef struct AVPacket {
1646  /**
1647  * A reference to the reference-counted buffer where the packet data is
1648  * stored.
1649  * May be NULL, then the packet data is not reference-counted.
1650  */
1652  /**
1653  * Presentation timestamp in AVStream->time_base units; the time at which
1654  * the decompressed packet will be presented to the user.
1655  * Can be AV_NOPTS_VALUE if it is not stored in the file.
1656  * pts MUST be larger or equal to dts as presentation cannot happen before
1657  * decompression, unless one wants to view hex dumps. Some formats misuse
1658  * the terms dts and pts/cts to mean something different. Such timestamps
1659  * must be converted to true pts/dts before they are stored in AVPacket.
1660  */
1661  int64_t pts;
1662  /**
1663  * Decompression timestamp in AVStream->time_base units; the time at which
1664  * the packet is decompressed.
1665  * Can be AV_NOPTS_VALUE if it is not stored in the file.
1666  */
1667  int64_t dts;
1669  int size;
1671  /**
1672  * A combination of AV_PKT_FLAG values
1673  */
1674  int flags;
1675  /**
1676  * Additional packet data that can be provided by the container.
1677  * Packet can contain several types of side information.
1678  */
1681 
1682  /**
1683  * Duration of this packet in AVStream->time_base units, 0 if unknown.
1684  * Equals next_pts - this_pts in presentation order.
1685  */
1686  int64_t duration;
1687 
1688  int64_t pos; ///< byte position in stream, -1 if unknown
1689 
1690 #if FF_API_CONVERGENCE_DURATION
1691  /**
1692  * @deprecated Same as the duration field, but as int64_t. This was required
1693  * for Matroska subtitles, whose duration values could overflow when the
1694  * duration field was still an int.
1695  */
1698 #endif
1699 } AVPacket;
1700 #define AV_PKT_FLAG_KEY 0x0001 ///< The packet contains a keyframe
1701 #define AV_PKT_FLAG_CORRUPT 0x0002 ///< The packet content is corrupted
1702 /**
1703  * Flag is used to discard packets which are required to maintain valid
1704  * decoder state but are not required for output and should be dropped
1705  * after decoding.
1706  **/
1707 #define AV_PKT_FLAG_DISCARD 0x0004
1708 
1714 };
1715 /**
1716  * @}
1717  */
1718 
1719 struct AVCodecInternal;
1720 
1724  AV_FIELD_TT, //< Top coded_first, top displayed first
1725  AV_FIELD_BB, //< Bottom coded first, bottom displayed first
1726  AV_FIELD_TB, //< Top coded first, bottom displayed first
1727  AV_FIELD_BT, //< Bottom coded first, top displayed first
1728 };
1729 
1730 /**
1731  * main external API structure.
1732  * New fields can be added to the end with minor version bumps.
1733  * Removal, reordering and changes to existing fields require a major
1734  * version bump.
1735  * You can use AVOptions (av_opt* / av_set/get*()) to access these fields from user
1736  * applications.
1737  * The name string for AVOptions options matches the associated command line
1738  * parameter name and can be found in libavcodec/options_table.h
1739  * The AVOption/command line parameter names differ in some cases from the C
1740  * structure field names for historic reasons or brevity.
1741  * sizeof(AVCodecContext) must not be used outside libav*.
1742  */
1743 typedef struct AVCodecContext {
1744  /**
1745  * information on struct for av_log
1746  * - set by avcodec_alloc_context3
1747  */
1750 
1751  enum AVMediaType codec_type; /* see AVMEDIA_TYPE_xxx */
1752  const struct AVCodec *codec;
1753 #if FF_API_CODEC_NAME
1754  /**
1755  * @deprecated this field is not used for anything in libavcodec
1756  */
1758  char codec_name[32];
1759 #endif
1760  enum AVCodecID codec_id; /* see AV_CODEC_ID_xxx */
1761 
1762  /**
1763  * fourcc (LSB first, so "ABCD" -> ('D'<<24) + ('C'<<16) + ('B'<<8) + 'A').
1764  * This is used to work around some encoder bugs.
1765  * A demuxer should set this to what is stored in the field used to identify the codec.
1766  * If there are multiple such fields in a container then the demuxer should choose the one
1767  * which maximizes the information about the used codec.
1768  * If the codec tag field in a container is larger than 32 bits then the demuxer should
1769  * remap the longer ID to 32 bits with a table or other structure. Alternatively a new
1770  * extra_codec_tag + size could be added but for this a clear advantage must be demonstrated
1771  * first.
1772  * - encoding: Set by user, if not then the default based on codec_id will be used.
1773  * - decoding: Set by user, will be converted to uppercase by libavcodec during init.
1774  */
1775  unsigned int codec_tag;
1776 
1777 #if FF_API_STREAM_CODEC_TAG
1778  /**
1779  * @deprecated this field is unused
1780  */
1782  unsigned int stream_codec_tag;
1783 #endif
1784 
1785  void *priv_data;
1786 
1787  /**
1788  * Private context used for internal data.
1789  *
1790  * Unlike priv_data, this is not codec-specific. It is used in general
1791  * libavcodec functions.
1792  */
1793  struct AVCodecInternal *internal;
1794 
1795  /**
1796  * Private data of the user, can be used to carry app specific stuff.
1797  * - encoding: Set by user.
1798  * - decoding: Set by user.
1799  */
1800  void *opaque;
1801 
1802  /**
1803  * the average bitrate
1804  * - encoding: Set by user; unused for constant quantizer encoding.
1805  * - decoding: Set by user, may be overwritten by libavcodec
1806  * if this info is available in the stream
1807  */
1808  int64_t bit_rate;
1809 
1810  /**
1811  * number of bits the bitstream is allowed to diverge from the reference.
1812  * the reference can be CBR (for CBR pass1) or VBR (for pass2)
1813  * - encoding: Set by user; unused for constant quantizer encoding.
1814  * - decoding: unused
1815  */
1817 
1818  /**
1819  * Global quality for codecs which cannot change it per frame.
1820  * This should be proportional to MPEG-1/2/4 qscale.
1821  * - encoding: Set by user.
1822  * - decoding: unused
1823  */
1825 
1826  /**
1827  * - encoding: Set by user.
1828  * - decoding: unused
1829  */
1831 #define FF_COMPRESSION_DEFAULT -1
1832 
1833  /**
1834  * AV_CODEC_FLAG_*.
1835  * - encoding: Set by user.
1836  * - decoding: Set by user.
1837  */
1838  int flags;
1839 
1840  /**
1841  * AV_CODEC_FLAG2_*
1842  * - encoding: Set by user.
1843  * - decoding: Set by user.
1844  */
1845  int flags2;
1846 
1847  /**
1848  * some codecs need / can use extradata like Huffman tables.
1849  * MJPEG: Huffman tables
1850  * rv10: additional flags
1851  * MPEG-4: global headers (they can be in the bitstream or here)
1852  * The allocated memory should be AV_INPUT_BUFFER_PADDING_SIZE bytes larger
1853  * than extradata_size to avoid problems if it is read with the bitstream reader.
1854  * The bytewise contents of extradata must not depend on the architecture or CPU endianness.
1855  * - encoding: Set/allocated/freed by libavcodec.
1856  * - decoding: Set/allocated/freed by user.
1857  */
1860 
1861  /**
1862  * This is the fundamental unit of time (in seconds) in terms
1863  * of which frame timestamps are represented. For fixed-fps content,
1864  * timebase should be 1/framerate and timestamp increments should be
1865  * identically 1.
1866  * This often, but not always is the inverse of the frame rate or field rate
1867  * for video. 1/time_base is not the average frame rate if the frame rate is not
1868  * constant.
1869  *
1870  * Like containers, elementary streams also can store timestamps, 1/time_base
1871  * is the unit in which these timestamps are specified.
1872  * As example of such codec time base see ISO/IEC 14496-2:2001(E)
1873  * vop_time_increment_resolution and fixed_vop_rate
1874  * (fixed_vop_rate == 0 implies that it is different from the framerate)
1875  *
1876  * - encoding: MUST be set by user.
1877  * - decoding: the use of this field for decoding is deprecated.
1878  * Use framerate instead.
1879  */
1881 
1882  /**
1883  * For some codecs, the time base is closer to the field rate than the frame rate.
1884  * Most notably, H.264 and MPEG-2 specify time_base as half of frame duration
1885  * if no telecine is used ...
1886  *
1887  * Set to time_base ticks per frame. Default 1, e.g., H.264/MPEG-2 set it to 2.
1888  */
1890 
1891  /**
1892  * Codec delay.
1893  *
1894  * Encoding: Number of frames delay there will be from the encoder input to
1895  * the decoder output. (we assume the decoder matches the spec)
1896  * Decoding: Number of frames delay in addition to what a standard decoder
1897  * as specified in the spec would produce.
1898  *
1899  * Video:
1900  * Number of frames the decoded output will be delayed relative to the
1901  * encoded input.
1902  *
1903  * Audio:
1904  * For encoding, this field is unused (see initial_padding).
1905  *
1906  * For decoding, this is the number of samples the decoder needs to
1907  * output before the decoder's output is valid. When seeking, you should
1908  * start decoding this many samples prior to your desired seek point.
1909  *
1910  * - encoding: Set by libavcodec.
1911  * - decoding: Set by libavcodec.
1912  */
1913  int delay;
1914 
1915 
1916  /* video only */
1917  /**
1918  * picture width / height.
1919  *
1920  * @note Those fields may not match the values of the last
1921  * AVFrame output by avcodec_decode_video2 due frame
1922  * reordering.
1923  *
1924  * - encoding: MUST be set by user.
1925  * - decoding: May be set by the user before opening the decoder if known e.g.
1926  * from the container. Some decoders will require the dimensions
1927  * to be set by the caller. During decoding, the decoder may
1928  * overwrite those values as required while parsing the data.
1929  */
1931 
1932  /**
1933  * Bitstream width / height, may be different from width/height e.g. when
1934  * the decoded frame is cropped before being output or lowres is enabled.
1935  *
1936  * @note Those field may not match the value of the last
1937  * AVFrame output by avcodec_receive_frame() due frame
1938  * reordering.
1939  *
1940  * - encoding: unused
1941  * - decoding: May be set by the user before opening the decoder if known
1942  * e.g. from the container. During decoding, the decoder may
1943  * overwrite those values as required while parsing the data.
1944  */
1946 
1947 #if FF_API_ASPECT_EXTENDED
1948 #define FF_ASPECT_EXTENDED 15
1949 #endif
1950 
1951  /**
1952  * the number of pictures in a group of pictures, or 0 for intra_only
1953  * - encoding: Set by user.
1954  * - decoding: unused
1955  */
1957 
1958  /**
1959  * Pixel format, see AV_PIX_FMT_xxx.
1960  * May be set by the demuxer if known from headers.
1961  * May be overridden by the decoder if it knows better.
1962  *
1963  * @note This field may not match the value of the last
1964  * AVFrame output by avcodec_receive_frame() due frame
1965  * reordering.
1966  *
1967  * - encoding: Set by user.
1968  * - decoding: Set by user if known, overridden by libavcodec while
1969  * parsing the data.
1970  */
1972 
1973 #if FF_API_MOTION_EST
1974  /**
1975  * This option does nothing
1976  * @deprecated use codec private options instead
1977  */
1979 #endif
1980 
1981  /**
1982  * If non NULL, 'draw_horiz_band' is called by the libavcodec
1983  * decoder to draw a horizontal band. It improves cache usage. Not
1984  * all codecs can do that. You must check the codec capabilities
1985  * beforehand.
1986  * When multithreading is used, it may be called from multiple threads
1987  * at the same time; threads might draw different parts of the same AVFrame,
1988  * or multiple AVFrames, and there is no guarantee that slices will be drawn
1989  * in order.
1990  * The function is also used by hardware acceleration APIs.
1991  * It is called at least once during frame decoding to pass
1992  * the data needed for hardware render.
1993  * In that mode instead of pixel data, AVFrame points to
1994  * a structure specific to the acceleration API. The application
1995  * reads the structure and can change some fields to indicate progress
1996  * or mark state.
1997  * - encoding: unused
1998  * - decoding: Set by user.
1999  * @param height the height of the slice
2000  * @param y the y position of the slice
2001  * @param type 1->top field, 2->bottom field, 3->frame
2002  * @param offset offset into the AVFrame.data from which the slice should be read
2003  */
2005  const AVFrame *src, int offset[AV_NUM_DATA_POINTERS],
2006  int y, int type, int height);
2007 
2008  /**
2009  * callback to negotiate the pixelFormat
2010  * @param fmt is the list of formats which are supported by the codec,
2011  * it is terminated by -1 as 0 is a valid format, the formats are ordered by quality.
2012  * The first is always the native one.
2013  * @note The callback may be called again immediately if initialization for
2014  * the selected (hardware-accelerated) pixel format failed.
2015  * @warning Behavior is undefined if the callback returns a value not
2016  * in the fmt list of formats.
2017  * @return the chosen format
2018  * - encoding: unused
2019  * - decoding: Set by user, if not set the native format will be chosen.
2020  */
2021  enum AVPixelFormat (*get_format)(struct AVCodecContext *s, const enum AVPixelFormat * fmt);
2022 
2023  /**
2024  * maximum number of B-frames between non-B-frames
2025  * Note: The output will be delayed by max_b_frames+1 relative to the input.
2026  * - encoding: Set by user.
2027  * - decoding: unused
2028  */
2030 
2031  /**
2032  * qscale factor between IP and B-frames
2033  * If > 0 then the last P-frame quantizer will be used (q= lastp_q*factor+offset).
2034  * If < 0 then normal ratecontrol will be done (q= -normal_q*factor+offset).
2035  * - encoding: Set by user.
2036  * - decoding: unused
2037  */
2039 
2040 #if FF_API_RC_STRATEGY
2041  /** @deprecated use codec private option instead */
2043 #define FF_RC_STRATEGY_XVID 1
2044 #endif
2045 
2046 #if FF_API_PRIVATE_OPT
2047  /** @deprecated use encoder private options instead */
2050 #endif
2051 
2052  /**
2053  * qscale offset between IP and B-frames
2054  * - encoding: Set by user.
2055  * - decoding: unused
2056  */
2058 
2059  /**
2060  * Size of the frame reordering buffer in the decoder.
2061  * For MPEG-2 it is 1 IPB or 0 low delay IP.
2062  * - encoding: Set by libavcodec.
2063  * - decoding: Set by libavcodec.
2064  */
2066 
2067 #if FF_API_PRIVATE_OPT
2068  /** @deprecated use encoder private options instead */
2071 #endif
2072 
2073  /**
2074  * qscale factor between P- and I-frames
2075  * If > 0 then the last P-frame quantizer will be used (q = lastp_q * factor + offset).
2076  * If < 0 then normal ratecontrol will be done (q= -normal_q*factor+offset).
2077  * - encoding: Set by user.
2078  * - decoding: unused
2079  */
2081 
2082  /**
2083  * qscale offset between P and I-frames
2084  * - encoding: Set by user.
2085  * - decoding: unused
2086  */
2088 
2089  /**
2090  * luminance masking (0-> disabled)
2091  * - encoding: Set by user.
2092  * - decoding: unused
2093  */
2095 
2096  /**
2097  * temporary complexity masking (0-> disabled)
2098  * - encoding: Set by user.
2099  * - decoding: unused
2100  */
2102 
2103  /**
2104  * spatial complexity masking (0-> disabled)
2105  * - encoding: Set by user.
2106  * - decoding: unused
2107  */
2109 
2110  /**
2111  * p block masking (0-> disabled)
2112  * - encoding: Set by user.
2113  * - decoding: unused
2114  */
2115  float p_masking;
2116 
2117  /**
2118  * darkness masking (0-> disabled)
2119  * - encoding: Set by user.
2120  * - decoding: unused
2121  */
2123 
2124  /**
2125  * slice count
2126  * - encoding: Set by libavcodec.
2127  * - decoding: Set by user (or 0).
2128  */
2130 
2131 #if FF_API_PRIVATE_OPT
2132  /** @deprecated use encoder private options instead */
2135 #define FF_PRED_LEFT 0
2136 #define FF_PRED_PLANE 1
2137 #define FF_PRED_MEDIAN 2
2138 #endif
2139 
2140  /**
2141  * slice offsets in the frame in bytes
2142  * - encoding: Set/allocated by libavcodec.
2143  * - decoding: Set/allocated by user (or NULL).
2144  */
2146 
2147  /**
2148  * sample aspect ratio (0 if unknown)
2149  * That is the width of a pixel divided by the height of the pixel.
2150  * Numerator and denominator must be relatively prime and smaller than 256 for some video standards.
2151  * - encoding: Set by user.
2152  * - decoding: Set by libavcodec.
2153  */
2155 
2156  /**
2157  * motion estimation comparison function
2158  * - encoding: Set by user.
2159  * - decoding: unused
2160  */
2161  int me_cmp;
2162  /**
2163  * subpixel motion estimation comparison function
2164  * - encoding: Set by user.
2165  * - decoding: unused
2166  */
2168  /**
2169  * macroblock comparison function (not supported yet)
2170  * - encoding: Set by user.
2171  * - decoding: unused
2172  */
2173  int mb_cmp;
2174  /**
2175  * interlaced DCT comparison function
2176  * - encoding: Set by user.
2177  * - decoding: unused
2178  */
2180 #define FF_CMP_SAD 0
2181 #define FF_CMP_SSE 1
2182 #define FF_CMP_SATD 2
2183 #define FF_CMP_DCT 3
2184 #define FF_CMP_PSNR 4
2185 #define FF_CMP_BIT 5
2186 #define FF_CMP_RD 6
2187 #define FF_CMP_ZERO 7
2188 #define FF_CMP_VSAD 8
2189 #define FF_CMP_VSSE 9
2190 #define FF_CMP_NSSE 10
2191 #define FF_CMP_W53 11
2192 #define FF_CMP_W97 12
2193 #define FF_CMP_DCTMAX 13
2194 #define FF_CMP_DCT264 14
2195 #define FF_CMP_MEDIAN_SAD 15
2196 #define FF_CMP_CHROMA 256
2197 
2198  /**
2199  * ME diamond size & shape
2200  * - encoding: Set by user.
2201  * - decoding: unused
2202  */
2204 
2205  /**
2206  * amount of previous MV predictors (2a+1 x 2a+1 square)
2207  * - encoding: Set by user.
2208  * - decoding: unused
2209  */
2211 
2212 #if FF_API_PRIVATE_OPT
2213  /** @deprecated use encoder private options instead */
2215  int pre_me;
2216 #endif
2217 
2218  /**
2219  * motion estimation prepass comparison function
2220  * - encoding: Set by user.
2221  * - decoding: unused
2222  */
2224 
2225  /**
2226  * ME prepass diamond size & shape
2227  * - encoding: Set by user.
2228  * - decoding: unused
2229  */
2231 
2232  /**
2233  * subpel ME quality
2234  * - encoding: Set by user.
2235  * - decoding: unused
2236  */
2238 
2239 #if FF_API_AFD
2240  /**
2241  * DTG active format information (additional aspect ratio
2242  * information only used in DVB MPEG-2 transport streams)
2243  * 0 if not set.
2244  *
2245  * - encoding: unused
2246  * - decoding: Set by decoder.
2247  * @deprecated Deprecated in favor of AVSideData
2248  */
2250 #define FF_DTG_AFD_SAME 8
2251 #define FF_DTG_AFD_4_3 9
2252 #define FF_DTG_AFD_16_9 10
2253 #define FF_DTG_AFD_14_9 11
2254 #define FF_DTG_AFD_4_3_SP_14_9 13
2255 #define FF_DTG_AFD_16_9_SP_14_9 14
2256 #define FF_DTG_AFD_SP_4_3 15
2257 #endif /* FF_API_AFD */
2258 
2259  /**
2260  * maximum motion estimation search range in subpel units
2261  * If 0 then no limit.
2262  *
2263  * - encoding: Set by user.
2264  * - decoding: unused
2265  */
2267 
2268 #if FF_API_QUANT_BIAS
2269  /**
2270  * @deprecated use encoder private option instead
2271  */
2273 #define FF_DEFAULT_QUANT_BIAS 999999
2274 
2275  /**
2276  * @deprecated use encoder private option instead
2277  */
2279 #endif
2280 
2281  /**
2282  * slice flags
2283  * - encoding: unused
2284  * - decoding: Set by user.
2285  */
2287 #define SLICE_FLAG_CODED_ORDER 0x0001 ///< draw_horiz_band() is called in coded order instead of display
2288 #define SLICE_FLAG_ALLOW_FIELD 0x0002 ///< allow draw_horiz_band() with field slices (MPEG-2 field pics)
2289 #define SLICE_FLAG_ALLOW_PLANE 0x0004 ///< allow draw_horiz_band() with 1 component at a time (SVQ1)
2290 
2291 #if FF_API_XVMC
2292  /**
2293  * XVideo Motion Acceleration
2294  * - encoding: forbidden
2295  * - decoding: set by decoder
2296  * @deprecated XvMC doesn't need it anymore.
2297  */
2298  attribute_deprecated int xvmc_acceleration;
2299 #endif /* FF_API_XVMC */
2300 
2301  /**
2302  * macroblock decision mode
2303  * - encoding: Set by user.
2304  * - decoding: unused
2305  */
2307 #define FF_MB_DECISION_SIMPLE 0 ///< uses mb_cmp
2308 #define FF_MB_DECISION_BITS 1 ///< chooses the one which needs the fewest bits
2309 #define FF_MB_DECISION_RD 2 ///< rate distortion
2310 
2311  /**
2312  * custom intra quantization matrix
2313  * - encoding: Set by user, can be NULL.
2314  * - decoding: Set by libavcodec.
2315  */
2316  uint16_t *intra_matrix;
2317 
2318  /**
2319  * custom inter quantization matrix
2320  * - encoding: Set by user, can be NULL.
2321  * - decoding: Set by libavcodec.
2322  */
2323  uint16_t *inter_matrix;
2324 
2325 #if FF_API_PRIVATE_OPT
2326  /** @deprecated use encoder private options instead */
2329 
2330  /** @deprecated use encoder private options instead */
2333 #endif
2334 
2335 #if FF_API_MPV_OPT
2336  /**
2337  * @deprecated this field is unused
2338  */
2341 
2342  /**
2343  * @deprecated this field is unused
2344  */
2347 #endif
2348 
2349  /**
2350  * precision of the intra DC coefficient - 8
2351  * - encoding: Set by user.
2352  * - decoding: Set by libavcodec
2353  */
2355 
2356  /**
2357  * Number of macroblock rows at the top which are skipped.
2358  * - encoding: unused
2359  * - decoding: Set by user.
2360  */
2362 
2363  /**
2364  * Number of macroblock rows at the bottom which are skipped.
2365  * - encoding: unused
2366  * - decoding: Set by user.
2367  */
2369 
2370 #if FF_API_MPV_OPT
2371  /**
2372  * @deprecated use encoder private options instead
2373  */
2376 #endif
2377 
2378  /**
2379  * minimum MB Lagrange multiplier
2380  * - encoding: Set by user.
2381  * - decoding: unused
2382  */
2383  int mb_lmin;
2384 
2385  /**
2386  * maximum MB Lagrange multiplier
2387  * - encoding: Set by user.
2388  * - decoding: unused
2389  */
2390  int mb_lmax;
2391 
2392 #if FF_API_PRIVATE_OPT
2393  /**
2394  * @deprecated use encoder private options instead
2395  */
2398 #endif
2399 
2400  /**
2401  * - encoding: Set by user.
2402  * - decoding: unused
2403  */
2405 
2406 #if FF_API_PRIVATE_OPT
2407  /** @deprecated use encoder private options instead */
2410 #endif
2411 
2412  /**
2413  * minimum GOP size
2414  * - encoding: Set by user.
2415  * - decoding: unused
2416  */
2418 
2419  /**
2420  * number of reference frames
2421  * - encoding: Set by user.
2422  * - decoding: Set by lavc.
2423  */
2424  int refs;
2425 
2426 #if FF_API_PRIVATE_OPT
2427  /** @deprecated use encoder private options instead */
2430 #endif
2431 
2432 #if FF_API_UNUSED_MEMBERS
2433  /**
2434  * Multiplied by qscale for each frame and added to scene_change_score.
2435  * - encoding: Set by user.
2436  * - decoding: unused
2437  */
2439 #endif
2440 
2441  /**
2442  * Note: Value depends upon the compare function used for fullpel ME.
2443  * - encoding: Set by user.
2444  * - decoding: unused
2445  */
2447 
2448 #if FF_API_PRIVATE_OPT
2449  /** @deprecated use encoder private options instead */
2452 #endif
2453 
2454  /**
2455  * Chromaticity coordinates of the source primaries.
2456  * - encoding: Set by user
2457  * - decoding: Set by libavcodec
2458  */
2460 
2461  /**
2462  * Color Transfer Characteristic.
2463  * - encoding: Set by user
2464  * - decoding: Set by libavcodec
2465  */
2467 
2468  /**
2469  * YUV colorspace type.
2470  * - encoding: Set by user
2471  * - decoding: Set by libavcodec
2472  */
2474 
2475  /**
2476  * MPEG vs JPEG YUV range.
2477  * - encoding: Set by user
2478  * - decoding: Set by libavcodec
2479  */
2481 
2482  /**
2483  * This defines the location of chroma samples.
2484  * - encoding: Set by user
2485  * - decoding: Set by libavcodec
2486  */
2488 
2489  /**
2490  * Number of slices.
2491  * Indicates number of picture subdivisions. Used for parallelized
2492  * decoding.
2493  * - encoding: Set by user
2494  * - decoding: unused
2495  */
2496  int slices;
2497 
2498  /** Field order
2499  * - encoding: set by libavcodec
2500  * - decoding: Set by user.
2501  */
2503 
2504  /* audio only */
2505  int sample_rate; ///< samples per second
2506  int channels; ///< number of audio channels
2507 
2508  /**
2509  * audio sample format
2510  * - encoding: Set by user.
2511  * - decoding: Set by libavcodec.
2512  */
2513  enum AVSampleFormat sample_fmt; ///< sample format
2514 
2515  /* The following data should not be initialized. */
2516  /**
2517  * Number of samples per channel in an audio frame.
2518  *
2519  * - encoding: set by libavcodec in avcodec_open2(). Each submitted frame
2520  * except the last must contain exactly frame_size samples per channel.
2521  * May be 0 when the codec has AV_CODEC_CAP_VARIABLE_FRAME_SIZE set, then the
2522  * frame size is not restricted.
2523  * - decoding: may be set by some decoders to indicate constant frame size
2524  */
2526 
2527  /**
2528  * Frame counter, set by libavcodec.
2529  *
2530  * - decoding: total number of frames returned from the decoder so far.
2531  * - encoding: total number of frames passed to the encoder so far.
2532  *
2533  * @note the counter is not incremented if encoding/decoding resulted in
2534  * an error.
2535  */
2537 
2538  /**
2539  * number of bytes per packet if constant and known or 0
2540  * Used by some WAV based audio codecs.
2541  */
2543 
2544  /**
2545  * Audio cutoff bandwidth (0 means "automatic")
2546  * - encoding: Set by user.
2547  * - decoding: unused
2548  */
2549  int cutoff;
2550 
2551  /**
2552  * Audio channel layout.
2553  * - encoding: set by user.
2554  * - decoding: set by user, may be overwritten by libavcodec.
2555  */
2556  uint64_t channel_layout;
2557 
2558  /**
2559  * Request decoder to use this channel layout if it can (0 for default)
2560  * - encoding: unused
2561  * - decoding: Set by user.
2562  */
2564 
2565  /**
2566  * Type of service that the audio stream conveys.
2567  * - encoding: Set by user.
2568  * - decoding: Set by libavcodec.
2569  */
2571 
2572  /**
2573  * desired sample format
2574  * - encoding: Not used.
2575  * - decoding: Set by user.
2576  * Decoder will decode to this format if it can.
2577  */
2579 
2580  /**
2581  * This callback is called at the beginning of each frame to get data
2582  * buffer(s) for it. There may be one contiguous buffer for all the data or
2583  * there may be a buffer per each data plane or anything in between. What
2584  * this means is, you may set however many entries in buf[] you feel necessary.
2585  * Each buffer must be reference-counted using the AVBuffer API (see description
2586  * of buf[] below).
2587  *
2588  * The following fields will be set in the frame before this callback is
2589  * called:
2590  * - format
2591  * - width, height (video only)
2592  * - sample_rate, channel_layout, nb_samples (audio only)
2593  * Their values may differ from the corresponding values in
2594  * AVCodecContext. This callback must use the frame values, not the codec
2595  * context values, to calculate the required buffer size.
2596  *
2597  * This callback must fill the following fields in the frame:
2598  * - data[]
2599  * - linesize[]
2600  * - extended_data:
2601  * * if the data is planar audio with more than 8 channels, then this
2602  * callback must allocate and fill extended_data to contain all pointers
2603  * to all data planes. data[] must hold as many pointers as it can.
2604  * extended_data must be allocated with av_malloc() and will be freed in
2605  * av_frame_unref().
2606  * * otherwise extended_data must point to data
2607  * - buf[] must contain one or more pointers to AVBufferRef structures. Each of
2608  * the frame's data and extended_data pointers must be contained in these. That
2609  * is, one AVBufferRef for each allocated chunk of memory, not necessarily one
2610  * AVBufferRef per data[] entry. See: av_buffer_create(), av_buffer_alloc(),
2611  * and av_buffer_ref().
2612  * - extended_buf and nb_extended_buf must be allocated with av_malloc() by
2613  * this callback and filled with the extra buffers if there are more
2614  * buffers than buf[] can hold. extended_buf will be freed in
2615  * av_frame_unref().
2616  *
2617  * If AV_CODEC_CAP_DR1 is not set then get_buffer2() must call
2618  * avcodec_default_get_buffer2() instead of providing buffers allocated by
2619  * some other means.
2620  *
2621  * Each data plane must be aligned to the maximum required by the target
2622  * CPU.
2623  *
2624  * @see avcodec_default_get_buffer2()
2625  *
2626  * Video:
2627  *
2628  * If AV_GET_BUFFER_FLAG_REF is set in flags then the frame may be reused
2629  * (read and/or written to if it is writable) later by libavcodec.
2630  *
2631  * avcodec_align_dimensions2() should be used to find the required width and
2632  * height, as they normally need to be rounded up to the next multiple of 16.
2633  *
2634  * Some decoders do not support linesizes changing between frames.
2635  *
2636  * If frame multithreading is used and thread_safe_callbacks is set,
2637  * this callback may be called from a different thread, but not from more
2638  * than one at once. Does not need to be reentrant.
2639  *
2640  * @see avcodec_align_dimensions2()
2641  *
2642  * Audio:
2643  *
2644  * Decoders request a buffer of a particular size by setting
2645  * AVFrame.nb_samples prior to calling get_buffer2(). The decoder may,
2646  * however, utilize only part of the buffer by setting AVFrame.nb_samples
2647  * to a smaller value in the output frame.
2648  *
2649  * As a convenience, av_samples_get_buffer_size() and
2650  * av_samples_fill_arrays() in libavutil may be used by custom get_buffer2()
2651  * functions to find the required data size and to fill data pointers and
2652  * linesize. In AVFrame.linesize, only linesize[0] may be set for audio
2653  * since all planes must be the same size.
2654  *
2655  * @see av_samples_get_buffer_size(), av_samples_fill_arrays()
2656  *
2657  * - encoding: unused
2658  * - decoding: Set by libavcodec, user can override.
2659  */
2661 
2662  /**
2663  * If non-zero, the decoded audio and video frames returned from
2664  * avcodec_decode_video2() and avcodec_decode_audio4() are reference-counted
2665  * and are valid indefinitely. The caller must free them with
2666  * av_frame_unref() when they are not needed anymore.
2667  * Otherwise, the decoded frames must not be freed by the caller and are
2668  * only valid until the next decode call.
2669  *
2670  * This is always automatically enabled if avcodec_receive_frame() is used.
2671  *
2672  * - encoding: unused
2673  * - decoding: set by the caller before avcodec_open2().
2674  */
2676 
2677  /* - encoding parameters */
2678  float qcompress; ///< amount of qscale change between easy & hard scenes (0.0-1.0)
2679  float qblur; ///< amount of qscale smoothing over time (0.0-1.0)
2680 
2681  /**
2682  * minimum quantizer
2683  * - encoding: Set by user.
2684  * - decoding: unused
2685  */
2686  int qmin;
2687 
2688  /**
2689  * maximum quantizer
2690  * - encoding: Set by user.
2691  * - decoding: unused
2692  */
2693  int qmax;
2694 
2695  /**
2696  * maximum quantizer difference between frames
2697  * - encoding: Set by user.
2698  * - decoding: unused
2699  */
2701 
2702 #if FF_API_MPV_OPT
2703  /**
2704  * @deprecated use encoder private options instead
2705  */
2707  float rc_qsquish;
2708 
2713 #endif
2714 
2715  /**
2716  * decoder bitstream buffer size
2717  * - encoding: Set by user.
2718  * - decoding: unused
2719  */
2721 
2722  /**
2723  * ratecontrol override, see RcOverride
2724  * - encoding: Allocated/set/freed by user.
2725  * - decoding: unused
2726  */
2729 
2730 #if FF_API_MPV_OPT
2731  /**
2732  * @deprecated use encoder private options instead
2733  */
2735  const char *rc_eq;
2736 #endif
2737 
2738  /**
2739  * maximum bitrate
2740  * - encoding: Set by user.
2741  * - decoding: Set by user, may be overwritten by libavcodec.
2742  */
2743  int64_t rc_max_rate;
2744 
2745  /**
2746  * minimum bitrate
2747  * - encoding: Set by user.
2748  * - decoding: unused
2749  */
2750  int64_t rc_min_rate;
2751 
2752 #if FF_API_MPV_OPT
2753  /**
2754  * @deprecated use encoder private options instead
2755  */
2758 
2761 #endif
2762 
2763  /**
2764  * Ratecontrol attempt to use, at maximum, <value> of what can be used without an underflow.
2765  * - encoding: Set by user.
2766  * - decoding: unused.
2767  */
2769 
2770  /**
2771  * Ratecontrol attempt to use, at least, <value> times the amount needed to prevent a vbv overflow.
2772  * - encoding: Set by user.
2773  * - decoding: unused.
2774  */
2776 
2777  /**
2778  * Number of bits which should be loaded into the rc buffer before decoding starts.
2779  * - encoding: Set by user.
2780  * - decoding: unused
2781  */
2783 
2784 #if FF_API_CODER_TYPE
2785 #define FF_CODER_TYPE_VLC 0
2786 #define FF_CODER_TYPE_AC 1
2787 #define FF_CODER_TYPE_RAW 2
2788 #define FF_CODER_TYPE_RLE 3
2789 #if FF_API_UNUSED_MEMBERS
2790 #define FF_CODER_TYPE_DEFLATE 4
2791 #endif /* FF_API_UNUSED_MEMBERS */
2792  /**
2793  * @deprecated use encoder private options instead
2794  */
2797 #endif /* FF_API_CODER_TYPE */
2798 
2799 #if FF_API_PRIVATE_OPT
2800  /** @deprecated use encoder private options instead */
2803 #endif
2804 
2805 #if FF_API_MPV_OPT
2806  /**
2807  * @deprecated use encoder private options instead
2808  */
2810  int lmin;
2811 
2812  /**
2813  * @deprecated use encoder private options instead
2814  */
2816  int lmax;
2817 #endif
2818 
2819 #if FF_API_PRIVATE_OPT
2820  /** @deprecated use encoder private options instead */
2823 
2824  /** @deprecated use encoder private options instead */
2827 
2828  /** @deprecated use encoder private options instead */
2831 
2832  /** @deprecated use encoder private options instead */
2835 #endif /* FF_API_PRIVATE_OPT */
2836 
2837  /**
2838  * trellis RD quantization
2839  * - encoding: Set by user.
2840  * - decoding: unused
2841  */
2842  int trellis;
2843 
2844 #if FF_API_PRIVATE_OPT
2845  /** @deprecated use encoder private options instead */
2848 
2849  /** @deprecated use encoder private options instead */
2852 
2853  /** @deprecated use encoder private options instead */
2856 #endif
2857 
2858 #if FF_API_RTP_CALLBACK
2859  /**
2860  * @deprecated unused
2861  */
2862  /* The RTP callback: This function is called */
2863  /* every time the encoder has a packet to send. */
2864  /* It depends on the encoder if the data starts */
2865  /* with a Start Code (it should). H.263 does. */
2866  /* mb_nb contains the number of macroblocks */
2867  /* encoded in the RTP payload. */
2869  void (*rtp_callback)(struct AVCodecContext *avctx, void *data, int size, int mb_nb);
2870 #endif
2871 
2872 #if FF_API_PRIVATE_OPT
2873  /** @deprecated use encoder private options instead */
2875  int rtp_payload_size; /* The size of the RTP payload: the coder will */
2876  /* do its best to deliver a chunk with size */
2877  /* below rtp_payload_size, the chunk will start */
2878  /* with a start code on some codecs like H.263. */
2879  /* This doesn't take account of any particular */
2880  /* headers inside the transmitted RTP payload. */
2881 #endif
2882 
2883 #if FF_API_STAT_BITS
2884  /* statistics, used for 2-pass encoding */
2886  int mv_bits;
2894  int i_count;
2896  int p_count;
2901 
2902  /** @deprecated this field is unused */
2905 #endif
2906 
2907  /**
2908  * pass1 encoding statistics output buffer
2909  * - encoding: Set by libavcodec.
2910  * - decoding: unused
2911  */
2912  char *stats_out;
2913 
2914  /**
2915  * pass2 encoding statistics input buffer
2916  * Concatenated stuff from stats_out of pass1 should be placed here.
2917  * - encoding: Allocated/set/freed by user.
2918  * - decoding: unused
2919  */
2920  char *stats_in;
2921 
2922  /**
2923  * Work around bugs in encoders which sometimes cannot be detected automatically.
2924  * - encoding: Set by user
2925  * - decoding: Set by user
2926  */
2928 #define FF_BUG_AUTODETECT 1 ///< autodetection
2929 #if FF_API_OLD_MSMPEG4
2930 #define FF_BUG_OLD_MSMPEG4 2
2931 #endif
2932 #define FF_BUG_XVID_ILACE 4
2933 #define FF_BUG_UMP4 8
2934 #define FF_BUG_NO_PADDING 16
2935 #define FF_BUG_AMV 32
2936 #if FF_API_AC_VLC
2937 #define FF_BUG_AC_VLC 0 ///< Will be removed, libavcodec can now handle these non-compliant files by default.
2938 #endif
2939 #define FF_BUG_QPEL_CHROMA 64
2940 #define FF_BUG_STD_QPEL 128
2941 #define FF_BUG_QPEL_CHROMA2 256
2942 #define FF_BUG_DIRECT_BLOCKSIZE 512
2943 #define FF_BUG_EDGE 1024
2944 #define FF_BUG_HPEL_CHROMA 2048
2945 #define FF_BUG_DC_CLIP 4096
2946 #define FF_BUG_MS 8192 ///< Work around various bugs in Microsoft's broken decoders.
2947 #define FF_BUG_TRUNCATED 16384
2948 #define FF_BUG_IEDGE 32768
2949 
2950  /**
2951  * strictly follow the standard (MPEG-4, ...).
2952  * - encoding: Set by user.
2953  * - decoding: Set by user.
2954  * Setting this to STRICT or higher means the encoder and decoder will
2955  * generally do stupid things, whereas setting it to unofficial or lower
2956  * will mean the encoder might produce output that is not supported by all
2957  * spec-compliant decoders. Decoders don't differentiate between normal,
2958  * unofficial and experimental (that is, they always try to decode things
2959  * when they can) unless they are explicitly asked to behave stupidly
2960  * (=strictly conform to the specs)
2961  */
2963 #define FF_COMPLIANCE_VERY_STRICT 2 ///< Strictly conform to an older more strict version of the spec or reference software.
2964 #define FF_COMPLIANCE_STRICT 1 ///< Strictly conform to all the things in the spec no matter what consequences.
2965 #define FF_COMPLIANCE_NORMAL 0
2966 #define FF_COMPLIANCE_UNOFFICIAL -1 ///< Allow unofficial extensions
2967 #define FF_COMPLIANCE_EXPERIMENTAL -2 ///< Allow nonstandardized experimental things.
2968 
2969  /**
2970  * error concealment flags
2971  * - encoding: unused
2972  * - decoding: Set by user.
2973  */
2975 #define FF_EC_GUESS_MVS 1
2976 #define FF_EC_DEBLOCK 2
2977 #define FF_EC_FAVOR_INTER 256
2978 
2979  /**
2980  * debug
2981  * - encoding: Set by user.
2982  * - decoding: Set by user.
2983  */
2984  int debug;
2985 #define FF_DEBUG_PICT_INFO 1
2986 #define FF_DEBUG_RC 2
2987 #define FF_DEBUG_BITSTREAM 4
2988 #define FF_DEBUG_MB_TYPE 8
2989 #define FF_DEBUG_QP 16
2990 #if FF_API_DEBUG_MV
2991 /**
2992  * @deprecated this option does nothing
2993  */
2994 #define FF_DEBUG_MV 32
2995 #endif
2996 #define FF_DEBUG_DCT_COEFF 0x00000040
2997 #define FF_DEBUG_SKIP 0x00000080
2998 #define FF_DEBUG_STARTCODE 0x00000100
2999 #if FF_API_UNUSED_MEMBERS
3000 #define FF_DEBUG_PTS 0x00000200
3001 #endif /* FF_API_UNUSED_MEMBERS */
3002 #define FF_DEBUG_ER 0x00000400
3003 #define FF_DEBUG_MMCO 0x00000800
3004 #define FF_DEBUG_BUGS 0x00001000
3005 #if FF_API_DEBUG_MV
3006 #define FF_DEBUG_VIS_QP 0x00002000
3007 #define FF_DEBUG_VIS_MB_TYPE 0x00004000
3008 #endif
3009 #define FF_DEBUG_BUFFERS 0x00008000
3010 #define FF_DEBUG_THREADS 0x00010000
3011 #define FF_DEBUG_GREEN_MD 0x00800000
3012 #define FF_DEBUG_NOMC 0x01000000
3013 
3014 #if FF_API_DEBUG_MV
3015  /**
3016  * debug
3017  * - encoding: Set by user.
3018  * - decoding: Set by user.
3019  */
3021 #define FF_DEBUG_VIS_MV_P_FOR 0x00000001 // visualize forward predicted MVs of P-frames
3022 #define FF_DEBUG_VIS_MV_B_FOR 0x00000002 // visualize forward predicted MVs of B-frames
3023 #define FF_DEBUG_VIS_MV_B_BACK 0x00000004 // visualize backward predicted MVs of B-frames
3024 #endif
3025 
3026  /**
3027  * Error recognition; may misdetect some more or less valid parts as errors.
3028  * - encoding: unused
3029  * - decoding: Set by user.
3030  */
3032 
3033 /**
3034  * Verify checksums embedded in the bitstream (could be of either encoded or
3035  * decoded data, depending on the codec) and print an error message on mismatch.
3036  * If AV_EF_EXPLODE is also set, a mismatching checksum will result in the
3037  * decoder returning an error.
3038  */
3039 #define AV_EF_CRCCHECK (1<<0)
3040 #define AV_EF_BITSTREAM (1<<1) ///< detect bitstream specification deviations
3041 #define AV_EF_BUFFER (1<<2) ///< detect improper bitstream length
3042 #define AV_EF_EXPLODE (1<<3) ///< abort decoding on minor error detection
3043 
3044 #define AV_EF_IGNORE_ERR (1<<15) ///< ignore errors and continue
3045 #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
3046 #define AV_EF_COMPLIANT (1<<17) ///< consider all spec non compliances as errors
3047 #define AV_EF_AGGRESSIVE (1<<18) ///< consider things that a sane encoder should not do as an error
3048 
3049 
3050  /**
3051  * opaque 64-bit number (generally a PTS) that will be reordered and
3052  * output in AVFrame.reordered_opaque
3053  * - encoding: unused
3054  * - decoding: Set by user.
3055  */
3057 
3058  /**
3059  * Hardware accelerator in use
3060  * - encoding: unused.
3061  * - decoding: Set by libavcodec
3062  */
3064 
3065  /**
3066  * Hardware accelerator context.
3067  * For some hardware accelerators, a global context needs to be
3068  * provided by the user. In that case, this holds display-dependent
3069  * data FFmpeg cannot instantiate itself. Please refer to the
3070  * FFmpeg HW accelerator documentation to know how to fill this
3071  * is. e.g. for VA API, this is a struct vaapi_context.
3072  * - encoding: unused
3073  * - decoding: Set by user
3074  */
3076 
3077  /**
3078  * error
3079  * - encoding: Set by libavcodec if flags & AV_CODEC_FLAG_PSNR.
3080  * - decoding: unused
3081  */
3083 
3084  /**
3085  * DCT algorithm, see FF_DCT_* below
3086  * - encoding: Set by user.
3087  * - decoding: unused
3088  */
3090 #define FF_DCT_AUTO 0
3091 #define FF_DCT_FASTINT 1
3092 #define FF_DCT_INT 2
3093 #define FF_DCT_MMX 3
3094 #define FF_DCT_ALTIVEC 5
3095 #define FF_DCT_FAAN 6
3096 
3097  /**
3098  * IDCT algorithm, see FF_IDCT_* below.
3099  * - encoding: Set by user.
3100  * - decoding: Set by user.
3101  */
3103 #define FF_IDCT_AUTO 0
3104 #define FF_IDCT_INT 1
3105 #define FF_IDCT_SIMPLE 2
3106 #define FF_IDCT_SIMPLEMMX 3
3107 #define FF_IDCT_ARM 7
3108 #define FF_IDCT_ALTIVEC 8
3109 #if FF_API_ARCH_SH4
3110 #define FF_IDCT_SH4 9
3111 #endif
3112 #define FF_IDCT_SIMPLEARM 10
3113 #if FF_API_UNUSED_MEMBERS
3114 #define FF_IDCT_IPP 13
3115 #endif /* FF_API_UNUSED_MEMBERS */
3116 #define FF_IDCT_XVID 14
3117 #if FF_API_IDCT_XVIDMMX
3118 #define FF_IDCT_XVIDMMX 14
3119 #endif /* FF_API_IDCT_XVIDMMX */
3120 #define FF_IDCT_SIMPLEARMV5TE 16
3121 #define FF_IDCT_SIMPLEARMV6 17
3122 #if FF_API_ARCH_SPARC
3123 #define FF_IDCT_SIMPLEVIS 18
3124 #endif
3125 #define FF_IDCT_FAAN 20
3126 #define FF_IDCT_SIMPLENEON 22
3127 #if FF_API_ARCH_ALPHA
3128 #define FF_IDCT_SIMPLEALPHA 23
3129 #endif
3130 #define FF_IDCT_SIMPLEAUTO 128
3131 
3132  /**
3133  * bits per sample/pixel from the demuxer (needed for huffyuv).
3134  * - encoding: Set by libavcodec.
3135  * - decoding: Set by user.
3136  */
3138 
3139  /**
3140  * Bits per sample/pixel of internal libavcodec pixel/sample format.
3141  * - encoding: set by user.
3142  * - decoding: set by libavcodec.
3143  */
3145 
3146 #if FF_API_LOWRES
3147  /**
3148  * low resolution decoding, 1-> 1/2 size, 2->1/4 size
3149  * - encoding: unused
3150  * - decoding: Set by user.
3151  */
3152  int lowres;
3153 #endif
3154 
3155 #if FF_API_CODED_FRAME
3156  /**
3157  * the picture in the bitstream
3158  * - encoding: Set by libavcodec.
3159  * - decoding: unused
3160  *
3161  * @deprecated use the quality factor packet side data instead
3162  */
3164 #endif
3165 
3166  /**
3167  * thread count
3168  * is used to decide how many independent tasks should be passed to execute()
3169  * - encoding: Set by user.
3170  * - decoding: Set by user.
3171  */
3173 
3174  /**
3175  * Which multithreading methods to use.
3176  * Use of FF_THREAD_FRAME will increase decoding delay by one frame per thread,
3177  * so clients which cannot provide future frames should not use it.
3178  *
3179  * - encoding: Set by user, otherwise the default is used.
3180  * - decoding: Set by user, otherwise the default is used.
3181  */
3183 #define FF_THREAD_FRAME 1 ///< Decode more than one frame at once
3184 #define FF_THREAD_SLICE 2 ///< Decode more than one part of a single frame at once
3185 
3186  /**
3187  * Which multithreading methods are in use by the codec.
3188  * - encoding: Set by libavcodec.
3189  * - decoding: Set by libavcodec.
3190  */
3192 
3193  /**
3194  * Set by the client if its custom get_buffer() callback can be called
3195  * synchronously from another thread, which allows faster multithreaded decoding.
3196  * draw_horiz_band() will be called from other threads regardless of this setting.
3197  * Ignored if the default get_buffer() is used.
3198  * - encoding: Set by user.
3199  * - decoding: Set by user.
3200  */
3202 
3203  /**
3204  * The codec may call this to execute several independent things.
3205  * It will return only after finishing all tasks.
3206  * The user may replace this with some multithreaded implementation,
3207  * the default implementation will execute the parts serially.
3208  * @param count the number of things to execute
3209  * - encoding: Set by libavcodec, user can override.
3210  * - decoding: Set by libavcodec, user can override.
3211  */
3212  int (*execute)(struct AVCodecContext *c, int (*func)(struct AVCodecContext *c2, void *arg), void *arg2, int *ret, int count, int size);
3213 
3214  /**
3215  * The codec may call this to execute several independent things.
3216  * It will return only after finishing all tasks.
3217  * The user may replace this with some multithreaded implementation,
3218  * the default implementation will execute the parts serially.
3219  * Also see avcodec_thread_init and e.g. the --enable-pthread configure option.
3220  * @param c context passed also to func
3221  * @param count the number of things to execute
3222  * @param arg2 argument passed unchanged to func
3223  * @param ret return values of executed functions, must have space for "count" values. May be NULL.
3224  * @param func function that will be called count times, with jobnr from 0 to count-1.
3225  * threadnr will be in the range 0 to c->thread_count-1 < MAX_THREADS and so that no
3226  * two instances of func executing at the same time will have the same threadnr.
3227  * @return always 0 currently, but code should handle a future improvement where when any call to func
3228  * returns < 0 no further calls to func may be done and < 0 is returned.
3229  * - encoding: Set by libavcodec, user can override.
3230  * - decoding: Set by libavcodec, user can override.
3231  */
3232  int (*execute2)(struct AVCodecContext *c, int (*func)(struct AVCodecContext *c2, void *arg, int jobnr, int threadnr), void *arg2, int *ret, int count);
3233 
3234  /**
3235  * noise vs. sse weight for the nsse comparison function
3236  * - encoding: Set by user.
3237  * - decoding: unused
3238  */
3240 
3241  /**
3242  * profile
3243  * - encoding: Set by user.
3244  * - decoding: Set by libavcodec.
3245  */
3246  int profile;
3247 #define FF_PROFILE_UNKNOWN -99
3248 #define FF_PROFILE_RESERVED -100
3249 
3250 #define FF_PROFILE_AAC_MAIN 0
3251 #define FF_PROFILE_AAC_LOW 1
3252 #define FF_PROFILE_AAC_SSR 2
3253 #define FF_PROFILE_AAC_LTP 3
3254 #define FF_PROFILE_AAC_HE 4
3255 #define FF_PROFILE_AAC_HE_V2 28
3256 #define FF_PROFILE_AAC_LD 22
3257 #define FF_PROFILE_AAC_ELD 38
3258 #define FF_PROFILE_MPEG2_AAC_LOW 128
3259 #define FF_PROFILE_MPEG2_AAC_HE 131
3260 
3261 #define FF_PROFILE_DNXHD 0
3262 #define FF_PROFILE_DNXHR_LB 1
3263 #define FF_PROFILE_DNXHR_SQ 2
3264 #define FF_PROFILE_DNXHR_HQ 3
3265 #define FF_PROFILE_DNXHR_HQX 4
3266 #define FF_PROFILE_DNXHR_444 5
3267 
3268 #define FF_PROFILE_DTS 20
3269 #define FF_PROFILE_DTS_ES 30
3270 #define FF_PROFILE_DTS_96_24 40
3271 #define FF_PROFILE_DTS_HD_HRA 50
3272 #define FF_PROFILE_DTS_HD_MA 60
3273 #define FF_PROFILE_DTS_EXPRESS 70
3274 
3275 #define FF_PROFILE_MPEG2_422 0
3276 #define FF_PROFILE_MPEG2_HIGH 1
3277 #define FF_PROFILE_MPEG2_SS 2
3278 #define FF_PROFILE_MPEG2_SNR_SCALABLE 3
3279 #define FF_PROFILE_MPEG2_MAIN 4
3280 #define FF_PROFILE_MPEG2_SIMPLE 5
3281 
3282 #define FF_PROFILE_H264_CONSTRAINED (1<<9) // 8+1; constraint_set1_flag
3283 #define FF_PROFILE_H264_INTRA (1<<11) // 8+3; constraint_set3_flag
3284 
3285 #define FF_PROFILE_H264_BASELINE 66
3286 #define FF_PROFILE_H264_CONSTRAINED_BASELINE (66|FF_PROFILE_H264_CONSTRAINED)
3287 #define FF_PROFILE_H264_MAIN 77
3288 #define FF_PROFILE_H264_EXTENDED 88
3289 #define FF_PROFILE_H264_HIGH 100
3290 #define FF_PROFILE_H264_HIGH_10 110
3291 #define FF_PROFILE_H264_HIGH_10_INTRA (110|FF_PROFILE_H264_INTRA)
3292 #define FF_PROFILE_H264_MULTIVIEW_HIGH 118
3293 #define FF_PROFILE_H264_HIGH_422 122
3294 #define FF_PROFILE_H264_HIGH_422_INTRA (122|FF_PROFILE_H264_INTRA)
3295 #define FF_PROFILE_H264_STEREO_HIGH 128
3296 #define FF_PROFILE_H264_HIGH_444 144
3297 #define FF_PROFILE_H264_HIGH_444_PREDICTIVE 244
3298 #define FF_PROFILE_H264_HIGH_444_INTRA (244|FF_PROFILE_H264_INTRA)
3299 #define FF_PROFILE_H264_CAVLC_444 44
3300 
3301 #define FF_PROFILE_VC1_SIMPLE 0
3302 #define FF_PROFILE_VC1_MAIN 1
3303 #define FF_PROFILE_VC1_COMPLEX 2
3304 #define FF_PROFILE_VC1_ADVANCED 3
3305 
3306 #define FF_PROFILE_MPEG4_SIMPLE 0
3307 #define FF_PROFILE_MPEG4_SIMPLE_SCALABLE 1
3308 #define FF_PROFILE_MPEG4_CORE 2
3309 #define FF_PROFILE_MPEG4_MAIN 3
3310 #define FF_PROFILE_MPEG4_N_BIT 4
3311 #define FF_PROFILE_MPEG4_SCALABLE_TEXTURE 5
3312 #define FF_PROFILE_MPEG4_SIMPLE_FACE_ANIMATION 6
3313 #define FF_PROFILE_MPEG4_BASIC_ANIMATED_TEXTURE 7
3314 #define FF_PROFILE_MPEG4_HYBRID 8
3315 #define FF_PROFILE_MPEG4_ADVANCED_REAL_TIME 9
3316 #define FF_PROFILE_MPEG4_CORE_SCALABLE 10
3317 #define FF_PROFILE_MPEG4_ADVANCED_CODING 11
3318 #define FF_PROFILE_MPEG4_ADVANCED_CORE 12
3319 #define FF_PROFILE_MPEG4_ADVANCED_SCALABLE_TEXTURE 13
3320 #define FF_PROFILE_MPEG4_SIMPLE_STUDIO 14
3321 #define FF_PROFILE_MPEG4_ADVANCED_SIMPLE 15
3322 
3323 #define FF_PROFILE_JPEG2000_CSTREAM_RESTRICTION_0 1
3324 #define FF_PROFILE_JPEG2000_CSTREAM_RESTRICTION_1 2
3325 #define FF_PROFILE_JPEG2000_CSTREAM_NO_RESTRICTION 32768
3326 #define FF_PROFILE_JPEG2000_DCINEMA_2K 3
3327 #define FF_PROFILE_JPEG2000_DCINEMA_4K 4
3328 
3329 #define FF_PROFILE_VP9_0 0
3330 #define FF_PROFILE_VP9_1 1
3331 #define FF_PROFILE_VP9_2 2
3332 #define FF_PROFILE_VP9_3 3
3333 
3334 #define FF_PROFILE_HEVC_MAIN 1
3335 #define FF_PROFILE_HEVC_MAIN_10 2
3336 #define FF_PROFILE_HEVC_MAIN_STILL_PICTURE 3
3337 #define FF_PROFILE_HEVC_REXT 4
3338 
3339  /**
3340  * level
3341  * - encoding: Set by user.
3342  * - decoding: Set by libavcodec.
3343  */
3344  int level;
3345 #define FF_LEVEL_UNKNOWN -99
3346 
3347  /**
3348  * Skip loop filtering for selected frames.
3349  * - encoding: unused
3350  * - decoding: Set by user.
3351  */
3353 
3354  /**
3355  * Skip IDCT/dequantization for selected frames.
3356  * - encoding: unused
3357  * - decoding: Set by user.
3358  */
3360 
3361  /**
3362  * Skip decoding for selected frames.
3363  * - encoding: unused
3364  * - decoding: Set by user.
3365  */
3367 
3368  /**
3369  * Header containing style information for text subtitles.
3370  * For SUBTITLE_ASS subtitle type, it should contain the whole ASS
3371  * [Script Info] and [V4+ Styles] section, plus the [Events] line and
3372  * the Format line following. It shouldn't include any Dialogue line.
3373  * - encoding: Set/allocated/freed by user (before avcodec_open2())
3374  * - decoding: Set/allocated/freed by libavcodec (by avcodec_open2())
3375  */
3378 
3379 #if FF_API_ERROR_RATE
3380  /**
3381  * @deprecated use the 'error_rate' private AVOption of the mpegvideo
3382  * encoders
3383  */
3386 #endif
3387 
3388 #if FF_API_VBV_DELAY
3389  /**
3390  * VBV delay coded in the last frame (in periods of a 27 MHz clock).
3391  * Used for compliant TS muxing.
3392  * - encoding: Set by libavcodec.
3393  * - decoding: unused.
3394  * @deprecated this value is now exported as a part of
3395  * AV_PKT_DATA_CPB_PROPERTIES packet side data
3396  */
3398  uint64_t vbv_delay;
3399 #endif
3400 
3401 #if FF_API_SIDEDATA_ONLY_PKT
3402  /**
3403  * Encoding only and set by default. Allow encoders to output packets
3404  * that do not contain any encoded data, only side data.
3405  *
3406  * Some encoders need to output such packets, e.g. to update some stream
3407  * parameters at the end of encoding.
3408  *
3409  * @deprecated this field disables the default behaviour and
3410  * it is kept only for compatibility.
3411  */
3414 #endif
3415 
3416  /**
3417  * Audio only. The number of "priming" samples (padding) inserted by the
3418  * encoder at the beginning of the audio. I.e. this number of leading
3419  * decoded samples must be discarded by the caller to get the original audio
3420  * without leading padding.
3421  *
3422  * - decoding: unused
3423  * - encoding: Set by libavcodec. The timestamps on the output packets are
3424  * adjusted by the encoder so that they always refer to the
3425  * first sample of the data actually contained in the packet,
3426  * including any added padding. E.g. if the timebase is
3427  * 1/samplerate and the timestamp of the first input sample is
3428  * 0, the timestamp of the first output packet will be
3429  * -initial_padding.
3430  */
3432 
3433  /**
3434  * - decoding: For codecs that store a framerate value in the compressed
3435  * bitstream, the decoder may export it here. { 0, 1} when
3436  * unknown.
3437  * - encoding: May be used to signal the framerate of CFR content to an
3438  * encoder.
3439  */
3441 
3442  /**
3443  * Nominal unaccelerated pixel format, see AV_PIX_FMT_xxx.
3444  * - encoding: unused.
3445  * - decoding: Set by libavcodec before calling get_format()
3446  */
3448 
3449  /**
3450  * Timebase in which pkt_dts/pts and AVPacket.dts/pts are.
3451  * - encoding unused.
3452  * - decoding set by user.
3453  */
3455 
3456  /**
3457  * AVCodecDescriptor
3458  * - encoding: unused.
3459  * - decoding: set by libavcodec.
3460  */
3462 
3463 #if !FF_API_LOWRES
3464  /**
3465  * low resolution decoding, 1-> 1/2 size, 2->1/4 size
3466  * - encoding: unused
3467  * - decoding: Set by user.
3468  */
3469  int lowres;
3470 #endif
3471 
3472  /**
3473  * Current statistics for PTS correction.
3474  * - decoding: maintained and used by libavcodec, not intended to be used by user apps
3475  * - encoding: unused
3476  */
3477  int64_t pts_correction_num_faulty_pts; /// Number of incorrect PTS values so far
3478  int64_t pts_correction_num_faulty_dts; /// Number of incorrect DTS values so far
3479  int64_t pts_correction_last_pts; /// PTS of the last frame
3480  int64_t pts_correction_last_dts; /// DTS of the last frame
3481 
3482  /**
3483  * Character encoding of the input subtitles file.
3484  * - decoding: set by user
3485  * - encoding: unused
3486  */
3488 
3489  /**
3490  * Subtitles character encoding mode. Formats or codecs might be adjusting
3491  * this setting (if they are doing the conversion themselves for instance).
3492  * - decoding: set by libavcodec
3493  * - encoding: unused
3494  */
3496 #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)
3497 #define FF_SUB_CHARENC_MODE_AUTOMATIC 0 ///< libavcodec will select the mode itself
3498 #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
3499 
3500  /**
3501  * Skip processing alpha if supported by codec.
3502  * Note that if the format uses pre-multiplied alpha (common with VP6,
3503  * and recommended due to better video quality/compression)
3504  * the image will look as if alpha-blended onto a black background.
3505  * However for formats that do not use pre-multiplied alpha
3506  * there might be serious artefacts (though e.g. libswscale currently
3507  * assumes pre-multiplied alpha anyway).
3508  *
3509  * - decoding: set by user
3510  * - encoding: unused
3511  */
3513 
3514  /**
3515  * Number of samples to skip after a discontinuity
3516  * - decoding: unused
3517  * - encoding: set by libavcodec
3518  */
3520 
3521 #if !FF_API_DEBUG_MV
3522  /**
3523  * debug motion vectors
3524  * - encoding: Set by user.
3525  * - decoding: Set by user.
3526  */
3527  int debug_mv;
3528 #define FF_DEBUG_VIS_MV_P_FOR 0x00000001 //visualize forward predicted MVs of P frames
3529 #define FF_DEBUG_VIS_MV_B_FOR 0x00000002 //visualize forward predicted MVs of B frames
3530 #define FF_DEBUG_VIS_MV_B_BACK 0x00000004 //visualize backward predicted MVs of B frames
3531 #endif
3532 
3533  /**
3534  * custom intra quantization matrix
3535  * - encoding: Set by user, can be NULL.
3536  * - decoding: unused.
3537  */
3539 
3540  /**
3541  * dump format separator.
3542  * can be ", " or "\n " or anything else
3543  * - encoding: Set by user.
3544  * - decoding: Set by user.
3545  */
3547 
3548  /**
3549  * ',' separated list of allowed decoders.
3550  * If NULL then all are allowed
3551  * - encoding: unused
3552  * - decoding: set by user
3553  */
3555 
3556  /*
3557  * Properties of the stream that gets decoded
3558  * - encoding: unused
3559  * - decoding: set by libavcodec
3560  */
3561  unsigned properties;
3562 #define FF_CODEC_PROPERTY_LOSSLESS 0x00000001
3563 #define FF_CODEC_PROPERTY_CLOSED_CAPTIONS 0x00000002
3564 
3565  /**
3566  * Additional data associated with the entire coded stream.
3567  *
3568  * - decoding: unused
3569  * - encoding: may be set by libavcodec after avcodec_open2().
3570  */
3573 
3574  /**
3575  * A reference to the AVHWFramesContext describing the input (for encoding)
3576  * or output (decoding) frames. The reference is set by the caller and
3577  * afterwards owned (and freed) by libavcodec - it should never be read by
3578  * the caller after being set.
3579  *
3580  * - decoding: This field should be set by the caller from the get_format()
3581  * callback. The previous reference (if any) will always be
3582  * unreffed by libavcodec before the get_format() call.
3583  *
3584  * If the default get_buffer2() is used with a hwaccel pixel
3585  * format, then this AVHWFramesContext will be used for
3586  * allocating the frame buffers.
3587  *
3588  * - encoding: For hardware encoders configured to use a hwaccel pixel
3589  * format, this field should be set by the caller to a reference
3590  * to the AVHWFramesContext describing input frames.
3591  * AVHWFramesContext.format must be equal to
3592  * AVCodecContext.pix_fmt.
3593  *
3594  * This field should be set before avcodec_open2() is called.
3595  */
3597 
3598  /**
3599  * Control the form of AVSubtitle.rects[N]->ass
3600  * - decoding: set by user
3601  * - encoding: unused
3602  */
3604 #define FF_SUB_TEXT_FMT_ASS 0
3605 #if FF_API_ASS_TIMING
3606 #define FF_SUB_TEXT_FMT_ASS_WITH_TIMINGS 1
3607 #endif
3608 
3609  /**
3610  * Audio only. The amount of padding (in samples) appended by the encoder to
3611  * the end of the audio. I.e. this number of decoded samples must be
3612  * discarded by the caller from the end of the stream to get the original
3613  * audio without any trailing padding.
3614  *
3615  * - decoding: unused
3616  * - encoding: unused
3617  */
3619 
3620  /**
3621  * The number of pixels per image to maximally accept.
3622  *
3623  * - decoding: set by user
3624  * - encoding: set by user
3625  */
3626  int64_t max_pixels;
3627 
3628  /**
3629  * A reference to the AVHWDeviceContext describing the device which will
3630  * be used by a hardware encoder/decoder. The reference is set by the
3631  * caller and afterwards owned (and freed) by libavcodec.
3632  *
3633  * This should be used if either the codec device does not require
3634  * hardware frames or any that are used are to be allocated internally by
3635  * libavcodec. If the user wishes to supply any of the frames used as
3636  * encoder input or decoder output then hw_frames_ctx should be used
3637  * instead. When hw_frames_ctx is set in get_format() for a decoder, this
3638  * field will be ignored while decoding the associated stream segment, but
3639  * may again be used on a following one after another get_format() call.
3640  *
3641  * For both encoders and decoders this field should be set before
3642  * avcodec_open2() is called and must not be written to thereafter.
3643  *
3644  * Note that some decoders may require this field to be set initially in
3645  * order to support hw_frames_ctx at all - in that case, all frames
3646  * contexts used must be created on the same device.
3647  */
3649 
3650  /**
3651  * Bit set of AV_HWACCEL_FLAG_* flags, which affect hardware accelerated
3652  * decoding (if active).
3653  * - encoding: unused
3654  * - decoding: Set by user (either before avcodec_open2(), or in the
3655  * AVCodecContext.get_format callback)
3656  */
3658 
3659  /**
3660  * Video decoding only. Certain video codecs support cropping, meaning that
3661  * only a sub-rectangle of the decoded frame is intended for display. This
3662  * option controls how cropping is handled by libavcodec.
3663  *
3664  * When set to 1 (the default), libavcodec will apply cropping internally.
3665  * I.e. it will modify the output frame width/height fields and offset the
3666  * data pointers (only by as much as possible while preserving alignment, or
3667  * by the full amount if the AV_CODEC_FLAG_UNALIGNED flag is set) so that
3668  * the frames output by the decoder refer only to the cropped area. The
3669  * crop_* fields of the output frames will be zero.
3670  *
3671  * When set to 0, the width/height fields of the output frames will be set
3672  * to the coded dimensions and the crop_* fields will describe the cropping
3673  * rectangle. Applying the cropping is left to the caller.
3674  *
3675  * @warning When hardware acceleration with opaque output frames is used,
3676  * libavcodec is unable to apply cropping from the top/left border.
3677  *
3678  * @note when this option is set to zero, the width/height fields of the
3679  * AVCodecContext and output AVFrames have different meanings. The codec
3680  * context fields store display dimensions (with the coded dimensions in
3681  * coded_width/height), while the frame fields store the coded dimensions
3682  * (with the display dimensions being determined by the crop_* fields).
3683  */
3685 } AVCodecContext;
3686 
3689 
3692 
3693 unsigned av_codec_get_codec_properties(const AVCodecContext *avctx);
3694 
3695 int av_codec_get_lowres(const AVCodecContext *avctx);
3696 void av_codec_set_lowres(AVCodecContext *avctx, int val);
3697 
3698 int av_codec_get_seek_preroll(const AVCodecContext *avctx);
3699 void av_codec_set_seek_preroll(AVCodecContext *avctx, int val);
3700 
3701 uint16_t *av_codec_get_chroma_intra_matrix(const AVCodecContext *avctx);
3702 void av_codec_set_chroma_intra_matrix(AVCodecContext *avctx, uint16_t *val);
3703 
3704 /**
3705  * AVProfile.
3706  */
3707 typedef struct AVProfile {
3708  int profile;
3709  const char *name; ///< short name for the profile
3710 } AVProfile;
3711 
3712 typedef struct AVCodecDefault AVCodecDefault;
3713 
3714 struct AVSubtitle;
3715 
3716 /**
3717  * AVCodec.
3718  */
3719 typedef struct AVCodec {
3720  /**
3721  * Name of the codec implementation.
3722  * The name is globally unique among encoders and among decoders (but an
3723  * encoder and a decoder can share the same name).
3724  * This is the primary way to find a codec from the user perspective.
3725  */
3726  const char *name;
3727  /**
3728  * Descriptive name for the codec, meant to be more human readable than name.
3729  * You should use the NULL_IF_CONFIG_SMALL() macro to define it.
3730  */
3731  const char *long_name;
3734  /**
3735  * Codec capabilities.
3736  * see AV_CODEC_CAP_*
3737  */
3739  const AVRational *supported_framerates; ///< array of supported framerates, or NULL if any, array is terminated by {0,0}
3740  const enum AVPixelFormat *pix_fmts; ///< array of supported pixel formats, or NULL if unknown, array is terminated by -1
3741  const int *supported_samplerates; ///< array of supported audio samplerates, or NULL if unknown, array is terminated by 0
3742  const enum AVSampleFormat *sample_fmts; ///< array of supported sample formats, or NULL if unknown, array is terminated by -1
3743  const uint64_t *channel_layouts; ///< array of support channel layouts, or NULL if unknown. array is terminated by 0
3744  uint8_t max_lowres; ///< maximum value for lowres supported by the decoder
3745  const AVClass *priv_class; ///< AVClass for the private context
3746  const AVProfile *profiles; ///< array of recognized profiles, or NULL if unknown, array is terminated by {FF_PROFILE_UNKNOWN}
3747 
3748  /*****************************************************************
3749  * No fields below this line are part of the public API. They
3750  * may not be used outside of libavcodec and can be changed and
3751  * removed at will.
3752  * New public fields should be added right above.
3753  *****************************************************************
3754  */
3756  struct AVCodec *next;
3757  /**
3758  * @name Frame-level threading support functions
3759  * @{
3760  */
3761  /**
3762  * If defined, called on thread contexts when they are created.
3763  * If the codec allocates writable tables in init(), re-allocate them here.
3764  * priv_data will be set to a copy of the original.
3765  */
3767  /**
3768  * Copy necessary context variables from a previous thread context to the current one.
3769  * If not defined, the next thread will start automatically; otherwise, the codec
3770  * must call ff_thread_finish_setup().
3771  *
3772  * dst and src will (rarely) point to the same context, in which case memcpy should be skipped.
3773  */
3775  /** @} */
3776 
3777  /**
3778  * Private codec-specific defaults.
3779  */
3781 
3782  /**
3783  * Initialize codec static data, called from avcodec_register().
3784  */
3785  void (*init_static_data)(struct AVCodec *codec);
3786 
3788  int (*encode_sub)(AVCodecContext *, uint8_t *buf, int buf_size,
3789  const struct AVSubtitle *sub);
3790  /**
3791  * Encode data to an AVPacket.
3792  *
3793  * @param avctx codec context
3794  * @param avpkt output AVPacket (may contain a user-provided buffer)
3795  * @param[in] frame AVFrame containing the raw data to be encoded
3796  * @param[out] got_packet_ptr encoder sets to 0 or 1 to indicate that a
3797  * non-empty packet was returned in avpkt.
3798  * @return 0 on success, negative error code on failure
3799  */
3800  int (*encode2)(AVCodecContext *avctx, AVPacket *avpkt, const AVFrame *frame,
3801  int *got_packet_ptr);
3802  int (*decode)(AVCodecContext *, void *outdata, int *outdata_size, AVPacket *avpkt);
3804  /**
3805  * Encode API with decoupled packet/frame dataflow. The API is the
3806  * same as the avcodec_ prefixed APIs (avcodec_send_frame() etc.), except
3807  * that:
3808  * - never called if the codec is closed or the wrong type,
3809  * - if AV_CODEC_CAP_DELAY is not set, drain frames are never sent,
3810  * - only one drain frame is ever passed down,
3811  */
3814 
3815  /**
3816  * Decode API with decoupled packet/frame dataflow. This function is called
3817  * to get one output frame. It should call ff_decode_get_packet() to obtain
3818  * input data.
3819  */
3821  /**
3822  * Flush buffers.
3823  * Will be called when seeking
3824  */
3826  /**
3827  * Internal codec capabilities.
3828  * See FF_CODEC_CAP_* in internal.h
3829  */
3831 
3832  /**
3833  * Decoding only, a comma-separated list of bitstream filters to apply to
3834  * packets before decoding.
3835  */
3836  const char *bsfs;
3837 } AVCodec;
3838 
3839 int av_codec_get_max_lowres(const AVCodec *codec);
3840 
3841 struct MpegEncContext;
3842 
3843 /**
3844  * @defgroup lavc_hwaccel AVHWAccel
3845  * @{
3846  */
3847 typedef struct AVHWAccel {
3848  /**
3849  * Name of the hardware accelerated codec.
3850  * The name is globally unique among encoders and among decoders (but an
3851  * encoder and a decoder can share the same name).
3852  */
3853  const char *name;
3854 
3855  /**
3856  * Type of codec implemented by the hardware accelerator.
3857  *
3858  * See AVMEDIA_TYPE_xxx
3859  */
3861 
3862  /**
3863  * Codec implemented by the hardware accelerator.
3864  *
3865  * See AV_CODEC_ID_xxx
3866  */
3868 
3869  /**
3870  * Supported pixel format.
3871  *
3872  * Only hardware accelerated formats are supported here.
3873  */
3875 
3876  /**
3877  * Hardware accelerated codec capabilities.
3878  * see HWACCEL_CODEC_CAP_*
3879  */
3881 
3882  /*****************************************************************
3883  * No fields below this line are part of the public API. They
3884  * may not be used outside of libavcodec and can be changed and
3885  * removed at will.
3886  * New public fields should be added right above.
3887  *****************************************************************
3888  */
3889  struct AVHWAccel *next;
3890 
3891  /**
3892  * Allocate a custom buffer
3893  */
3895 
3896  /**
3897  * Called at the beginning of each frame or field picture.
3898  *
3899  * Meaningful frame information (codec specific) is guaranteed to
3900  * be parsed at this point. This function is mandatory.
3901  *
3902  * Note that buf can be NULL along with buf_size set to 0.
3903  * Otherwise, this means the whole frame is available at this point.
3904  *
3905  * @param avctx the codec context
3906  * @param buf the frame data buffer base
3907  * @param buf_size the size of the frame in bytes
3908  * @return zero if successful, a negative value otherwise
3909  */
3910  int (*start_frame)(AVCodecContext *avctx, const uint8_t *buf, uint32_t buf_size);
3911 
3912  /**
3913  * Callback for each slice.
3914  *
3915  * Meaningful slice information (codec specific) is guaranteed to
3916  * be parsed at this point. This function is mandatory.
3917  * The only exception is XvMC, that works on MB level.
3918  *
3919  * @param avctx the codec context
3920  * @param buf the slice data buffer base
3921  * @param buf_size the size of the slice in bytes
3922  * @return zero if successful, a negative value otherwise
3923  */
3924  int (*decode_slice)(AVCodecContext *avctx, const uint8_t *buf, uint32_t buf_size);
3925 
3926  /**
3927  * Called at the end of each frame or field picture.
3928  *
3929  * The whole picture is parsed at this point and can now be sent
3930  * to the hardware accelerator. This function is mandatory.
3931  *
3932  * @param avctx the codec context
3933  * @return zero if successful, a negative value otherwise
3934  */
3936 
3937  /**
3938  * Size of per-frame hardware accelerator private data.
3939  *
3940  * Private data is allocated with av_mallocz() before
3941  * AVCodecContext.get_buffer() and deallocated after
3942  * AVCodecContext.release_buffer().
3943  */
3945 
3946  /**
3947  * Called for every Macroblock in a slice.
3948  *
3949  * XvMC uses it to replace the ff_mpv_decode_mb().
3950  * Instead of decoding to raw picture, MB parameters are
3951  * stored in an array provided by the video driver.
3952  *
3953  * @param s the mpeg context
3954  */
3956 
3957  /**
3958  * Initialize the hwaccel private data.
3959  *
3960  * This will be called from ff_get_format(), after hwaccel and
3961  * hwaccel_context are set and the hwaccel private data in AVCodecInternal
3962  * is allocated.
3963  */
3965 
3966  /**
3967  * Uninitialize the hwaccel private data.
3968  *
3969  * This will be called from get_format() or avcodec_close(), after hwaccel
3970  * and hwaccel_context are already uninitialized.
3971  */
3973 
3974  /**
3975  * Size of the private data to allocate in
3976  * AVCodecInternal.hwaccel_priv_data.
3977  */
3979 
3980  /**
3981  * Internal hwaccel capabilities.
3982  */
3984 } AVHWAccel;
3985 
3986 /**
3987  * Hardware acceleration should be used for decoding even if the codec level
3988  * used is unknown or higher than the maximum supported level reported by the
3989  * hardware driver.
3990  *
3991  * It's generally a good idea to pass this flag unless you have a specific
3992  * reason not to, as hardware tends to under-report supported levels.
3993  */
3994 #define AV_HWACCEL_FLAG_IGNORE_LEVEL (1 << 0)
3995 
3996 /**
3997  * Hardware acceleration can output YUV pixel formats with a different chroma
3998  * sampling than 4:2:0 and/or other than 8 bits per component.
3999  */
4000 #define AV_HWACCEL_FLAG_ALLOW_HIGH_DEPTH (1 << 1)
4001 
4002 /**
4003  * @}
4004  */
4005 
4006 #if FF_API_AVPICTURE
4007 /**
4008  * @defgroup lavc_picture AVPicture
4009  *
4010  * Functions for working with AVPicture
4011  * @{
4012  */
4013 
4014 /**
4015  * Picture data structure.
4016  *
4017  * Up to four components can be stored into it, the last component is
4018  * alpha.
4019  * @deprecated use AVFrame or imgutils functions instead
4020  */
4021 typedef struct AVPicture {
4023  uint8_t *data[AV_NUM_DATA_POINTERS]; ///< pointers to the image data planes
4025  int linesize[AV_NUM_DATA_POINTERS]; ///< number of bytes per line
4026 } AVPicture;
4027 
4028 /**
4029  * @}
4030  */
4031 #endif
4032 
4035 
4036  SUBTITLE_BITMAP, ///< A bitmap, pict will be set
4037 
4038  /**
4039  * Plain text, the text field must be set by the decoder and is
4040  * authoritative. ass and pict fields may contain approximations.
4041  */
4043 
4044  /**
4045  * Formatted text, the ass field must be set by the decoder and is
4046  * authoritative. pict and text fields may contain approximations.
4047  */
4049 };
4050 
4051 #define AV_SUBTITLE_FLAG_FORCED 0x00000001
4052 
4053 typedef struct AVSubtitleRect {
4054  int x; ///< top left corner of pict, undefined when pict is not set
4055  int y; ///< top left corner of pict, undefined when pict is not set
4056  int w; ///< width of pict, undefined when pict is not set
4057  int h; ///< height of pict, undefined when pict is not set
4058  int nb_colors; ///< number of colors in pict, undefined when pict is not set
4059 
4060 #if FF_API_AVPICTURE
4061  /**
4062  * @deprecated unused
4063  */
4066 #endif
4067  /**
4068  * data+linesize for the bitmap of this subtitle.
4069  * Can be set for text/ass as well once they are rendered.
4070  */
4072  int linesize[4];
4073 
4075 
4076  char *text; ///< 0 terminated plain UTF-8 text
4077 
4078  /**
4079  * 0 terminated ASS/SSA compatible event line.
4080  * The presentation of this is unaffected by the other values in this
4081  * struct.
4082  */
4083  char *ass;
4084 
4085  int flags;
4086 } AVSubtitleRect;
4087 
4088 typedef struct AVSubtitle {
4089  uint16_t format; /* 0 = graphics */
4090  uint32_t start_display_time; /* relative to packet pts, in ms */
4091  uint32_t end_display_time; /* relative to packet pts, in ms */
4092  unsigned num_rects;
4094  int64_t pts; ///< Same as packet pts, in AV_TIME_BASE
4095 } AVSubtitle;
4096 
4097 /**
4098  * This struct describes the properties of an encoded stream.
4099  *
4100  * sizeof(AVCodecParameters) is not a part of the public ABI, this struct must
4101  * be allocated with avcodec_parameters_alloc() and freed with
4102  * avcodec_parameters_free().
4103  */
4104 typedef struct AVCodecParameters {
4105  /**
4106  * General type of the encoded data.
4107  */
4109  /**
4110  * Specific type of the encoded data (the codec used).
4111  */
4113  /**
4114  * Additional information about the codec (corresponds to the AVI FOURCC).
4115  */
4116  uint32_t codec_tag;
4117 
4118  /**
4119  * Extra binary data needed for initializing the decoder, codec-dependent.
4120  *
4121  * Must be allocated with av_malloc() and will be freed by
4122  * avcodec_parameters_free(). The allocated size of extradata must be at
4123  * least extradata_size + AV_INPUT_BUFFER_PADDING_SIZE, with the padding
4124  * bytes zeroed.
4125  */
4127  /**
4128  * Size of the extradata content in bytes.
4129  */
4131 
4132  /**
4133  * - video: the pixel format, the value corresponds to enum AVPixelFormat.
4134  * - audio: the sample format, the value corresponds to enum AVSampleFormat.
4135  */
4136  int format;
4137 
4138  /**
4139  * The average bitrate of the encoded data (in bits per second).
4140  */
4141  int64_t bit_rate;
4142 
4143  /**
4144  * The number of bits per sample in the codedwords.
4145  *
4146  * This is basically the bitrate per sample. It is mandatory for a bunch of
4147  * formats to actually decode them. It's the number of bits for one sample in
4148  * the actual coded bitstream.
4149  *
4150  * This could be for example 4 for ADPCM
4151  * For PCM formats this matches bits_per_raw_sample
4152  * Can be 0
4153  */
4155 
4156  /**
4157  * This is the number of valid bits in each output sample. If the
4158  * sample format has more bits, the least significant bits are additional
4159  * padding bits, which are always 0. Use right shifts to reduce the sample
4160  * to its actual size. For example, audio formats with 24 bit samples will
4161  * have bits_per_raw_sample set to 24, and format set to AV_SAMPLE_FMT_S32.
4162  * To get the original sample use "(int32_t)sample >> 8"."
4163  *
4164  * For ADPCM this might be 12 or 16 or similar
4165  * Can be 0
4166  */
4168 
4169  /**
4170  * Codec-specific bitstream restrictions that the stream conforms to.
4171  */
4172  int profile;
4173  int level;
4174 
4175  /**
4176  * Video only. The dimensions of the video frame in pixels.
4177  */
4178  int width;
4179  int height;
4180 
4181  /**
4182  * Video only. The aspect ratio (width / height) which a single pixel
4183  * should have when displayed.
4184  *
4185  * When the aspect ratio is unknown / undefined, the numerator should be
4186  * set to 0 (the denominator may have any value).
4187  */
4189 
4190  /**
4191  * Video only. The order of the fields in interlaced video.
4192  */
4194 
4195  /**
4196  * Video only. Additional colorspace characteristics.
4197  */
4203 
4204  /**
4205  * Video only. Number of delayed frames.
4206  */
4208 
4209  /**
4210  * Audio only. The channel layout bitmask. May be 0 if the channel layout is
4211  * unknown or unspecified, otherwise the number of bits set must be equal to
4212  * the channels field.
4213  */
4214  uint64_t channel_layout;
4215  /**
4216  * Audio only. The number of audio channels.
4217  */
4219  /**
4220  * Audio only. The number of audio samples per second.
4221  */
4223  /**
4224  * Audio only. The number of bytes per coded audio frame, required by some
4225  * formats.
4226  *
4227  * Corresponds to nBlockAlign in WAVEFORMATEX.
4228  */
4230  /**
4231  * Audio only. Audio frame size, if known. Required by some formats to be static.
4232  */
4234 
4235  /**
4236  * Audio only. The amount of padding (in samples) inserted by the encoder at
4237  * the beginning of the audio. I.e. this number of leading decoded samples
4238  * must be discarded by the caller to get the original audio without leading
4239  * padding.
4240  */
4242  /**
4243  * Audio only. The amount of padding (in samples) appended by the encoder to
4244  * the end of the audio. I.e. this number of decoded samples must be
4245  * discarded by the caller from the end of the stream to get the original
4246  * audio without any trailing padding.
4247  */
4249  /**
4250  * Audio only. Number of samples to skip after a discontinuity.
4251  */
4254 
4255 /**
4256  * If c is NULL, returns the first registered codec,
4257  * if c is non-NULL, returns the next registered codec after c,
4258  * or NULL if c is the last one.
4259  */
4260 AVCodec *av_codec_next(const AVCodec *c);
4261 
4262 /**
4263  * Return the LIBAVCODEC_VERSION_INT constant.
4264  */
4265 unsigned avcodec_version(void);
4266 
4267 /**
4268  * Return the libavcodec build-time configuration.
4269  */
4270 const char *avcodec_configuration(void);
4271 
4272 /**
4273  * Return the libavcodec license.
4274  */
4275 const char *avcodec_license(void);
4276 
4277 /**
4278  * Register the codec codec and initialize libavcodec.
4279  *
4280  * @warning either this function or avcodec_register_all() must be called
4281  * before any other libavcodec functions.
4282  *
4283  * @see avcodec_register_all()
4284  */
4285 void avcodec_register(AVCodec *codec);
4286 
4287 /**
4288  * Register all the codecs, parsers and bitstream filters which were enabled at
4289  * configuration time. If you do not call this function you can select exactly
4290  * which formats you want to support, by using the individual registration
4291  * functions.
4292  *
4293  * @see avcodec_register
4294  * @see av_register_codec_parser
4295  * @see av_register_bitstream_filter
4296  */
4297 void avcodec_register_all(void);
4298 
4299 /**
4300  * Allocate an AVCodecContext and set its fields to default values. The
4301  * resulting struct should be freed with avcodec_free_context().
4302  *
4303  * @param codec if non-NULL, allocate private data and initialize defaults
4304  * for the given codec. It is illegal to then call avcodec_open2()
4305  * with a different codec.
4306  * If NULL, then the codec-specific defaults won't be initialized,
4307  * which may result in suboptimal default settings (this is
4308  * important mainly for encoders, e.g. libx264).
4309  *
4310  * @return An AVCodecContext filled with default values or NULL on failure.
4311  */
4313 
4314 /**
4315  * Free the codec context and everything associated with it and write NULL to
4316  * the provided pointer.
4317  */
4318 void avcodec_free_context(AVCodecContext **avctx);
4319 
4320 #if FF_API_GET_CONTEXT_DEFAULTS
4321 /**
4322  * @deprecated This function should not be used, as closing and opening a codec
4323  * context multiple time is not supported. A new codec context should be
4324  * allocated for each new use.
4325  */
4327 #endif
4328 
4329 /**
4330  * Get the AVClass for AVCodecContext. It can be used in combination with
4331  * AV_OPT_SEARCH_FAKE_OBJ for examining options.
4332  *
4333  * @see av_opt_find().
4334  */
4335 const AVClass *avcodec_get_class(void);
4336 
4337 #if FF_API_COPY_CONTEXT
4338 /**
4339  * Get the AVClass for AVFrame. It can be used in combination with
4340  * AV_OPT_SEARCH_FAKE_OBJ for examining options.
4341  *
4342  * @see av_opt_find().
4343  */
4344 const AVClass *avcodec_get_frame_class(void);
4345 
4346 /**
4347  * Get the AVClass for AVSubtitleRect. It can be used in combination with
4348  * AV_OPT_SEARCH_FAKE_OBJ for examining options.
4349  *
4350  * @see av_opt_find().
4351  */
4353 
4354 /**
4355  * Copy the settings of the source AVCodecContext into the destination
4356  * AVCodecContext. The resulting destination codec context will be
4357  * unopened, i.e. you are required to call avcodec_open2() before you
4358  * can use this AVCodecContext to decode/encode video/audio data.
4359  *
4360  * @param dest target codec context, should be initialized with
4361  * avcodec_alloc_context3(NULL), but otherwise uninitialized
4362  * @param src source codec context
4363  * @return AVERROR() on error (e.g. memory allocation error), 0 on success
4364  *
4365  * @deprecated The semantics of this function are ill-defined and it should not
4366  * be used. If you need to transfer the stream parameters from one codec context
4367  * to another, use an intermediate AVCodecParameters instance and the
4368  * avcodec_parameters_from_context() / avcodec_parameters_to_context()
4369  * functions.
4370  */
4373 #endif
4374 
4375 /**
4376  * Allocate a new AVCodecParameters and set its fields to default values
4377  * (unknown/invalid/0). The returned struct must be freed with
4378  * avcodec_parameters_free().
4379  */
4381 
4382 /**
4383  * Free an AVCodecParameters instance and everything associated with it and
4384  * write NULL to the supplied pointer.
4385  */
4387 
4388 /**
4389  * Copy the contents of src to dst. Any allocated fields in dst are freed and
4390  * replaced with newly allocated duplicates of the corresponding fields in src.
4391  *
4392  * @return >= 0 on success, a negative AVERROR code on failure.
4393  */
4395 
4396 /**
4397  * Fill the parameters struct based on the values from the supplied codec
4398  * context. Any allocated fields in par are freed and replaced with duplicates
4399  * of the corresponding fields in codec.
4400  *
4401  * @return >= 0 on success, a negative AVERROR code on failure
4402  */
4404  const AVCodecContext *codec);
4405 
4406 /**
4407  * Fill the codec context based on the values from the supplied codec
4408  * parameters. Any allocated fields in codec that have a corresponding field in
4409  * par are freed and replaced with duplicates of the corresponding field in par.
4410  * Fields in codec that do not have a counterpart in par are not touched.
4411  *
4412  * @return >= 0 on success, a negative AVERROR code on failure.
4413  */
4415  const AVCodecParameters *par);
4416 
4417 /**
4418  * Initialize the AVCodecContext to use the given AVCodec. Prior to using this
4419  * function the context has to be allocated with avcodec_alloc_context3().
4420  *
4421  * The functions avcodec_find_decoder_by_name(), avcodec_find_encoder_by_name(),
4422  * avcodec_find_decoder() and avcodec_find_encoder() provide an easy way for
4423  * retrieving a codec.
4424  *
4425  * @warning This function is not thread safe!
4426  *
4427  * @note Always call this function before using decoding routines (such as
4428  * @ref avcodec_receive_frame()).
4429  *
4430  * @code
4431  * avcodec_register_all();
4432  * av_dict_set(&opts, "b", "2.5M", 0);
4433  * codec = avcodec_find_decoder(AV_CODEC_ID_H264);
4434  * if (!codec)
4435  * exit(1);
4436  *
4437  * context = avcodec_alloc_context3(codec);
4438  *
4439  * if (avcodec_open2(context, codec, opts) < 0)
4440  * exit(1);
4441  * @endcode
4442  *
4443  * @param avctx The context to initialize.
4444  * @param codec The codec to open this context for. If a non-NULL codec has been
4445  * previously passed to avcodec_alloc_context3() or
4446  * for this context, then this parameter MUST be either NULL or
4447  * equal to the previously passed codec.
4448  * @param options A dictionary filled with AVCodecContext and codec-private options.
4449  * On return this object will be filled with options that were not found.
4450  *
4451  * @return zero on success, a negative value on error
4452  * @see avcodec_alloc_context3(), avcodec_find_decoder(), avcodec_find_encoder(),
4453  * av_dict_set(), av_opt_find().
4454  */
4455 int avcodec_open2(AVCodecContext *avctx, const AVCodec *codec, AVDictionary **options);
4456 
4457 /**
4458  * Close a given AVCodecContext and free all the data associated with it
4459  * (but not the AVCodecContext itself).
4460  *
4461  * Calling this function on an AVCodecContext that hasn't been opened will free
4462  * the codec-specific data allocated in avcodec_alloc_context3() with a non-NULL
4463  * codec. Subsequent calls will do nothing.
4464  *
4465  * @note Do not use this function. Use avcodec_free_context() to destroy a
4466  * codec context (either open or closed). Opening and closing a codec context
4467  * multiple times is not supported anymore -- use multiple codec contexts
4468  * instead.
4469  */
4470 int avcodec_close(AVCodecContext *avctx);
4471 
4472 /**
4473  * Free all allocated data in the given subtitle struct.
4474  *
4475  * @param sub AVSubtitle to free.
4476  */
4477 void avsubtitle_free(AVSubtitle *sub);
4478 
4479 /**
4480  * @}
4481  */
4482 
4483 /**
4484  * @addtogroup lavc_packet
4485  * @{
4486  */
4487 
4488 /**
4489  * Allocate an AVPacket and set its fields to default values. The resulting
4490  * struct must be freed using av_packet_free().
4491  *
4492  * @return An AVPacket filled with default values or NULL on failure.
4493  *
4494  * @note this only allocates the AVPacket itself, not the data buffers. Those
4495  * must be allocated through other means such as av_new_packet.
4496  *
4497  * @see av_new_packet
4498  */
4499 AVPacket *av_packet_alloc(void);
4500 
4501 /**
4502  * Create a new packet that references the same data as src.
4503  *
4504  * This is a shortcut for av_packet_alloc()+av_packet_ref().
4505  *
4506  * @return newly created AVPacket on success, NULL on error.
4507  *
4508  * @see av_packet_alloc
4509  * @see av_packet_ref
4510  */
4512 
4513 /**
4514  * Free the packet, if the packet is reference counted, it will be
4515  * unreferenced first.
4516  *
4517  * @param pkt packet to be freed. The pointer will be set to NULL.
4518  * @note passing NULL is a no-op.
4519  */
4520 void av_packet_free(AVPacket **pkt);
4521 
4522 /**
4523  * Initialize optional fields of a packet with default values.
4524  *
4525  * Note, this does not touch the data and size members, which have to be
4526  * initialized separately.
4527  *
4528  * @param pkt packet
4529  */
4530 void av_init_packet(AVPacket *pkt);
4531 
4532 /**
4533  * Allocate the payload of a packet and initialize its fields with
4534  * default values.
4535  *
4536  * @param pkt packet
4537  * @param size wanted payload size
4538  * @return 0 if OK, AVERROR_xxx otherwise
4539  */
4540 int av_new_packet(AVPacket *pkt, int size);
4541 
4542 /**
4543  * Reduce packet size, correctly zeroing padding
4544  *
4545  * @param pkt packet
4546  * @param size new size
4547  */
4548 void av_shrink_packet(AVPacket *pkt, int size);
4549 
4550 /**
4551  * Increase packet size, correctly zeroing padding
4552  *
4553  * @param pkt packet
4554  * @param grow_by number of bytes by which to increase the size of the packet
4555  */
4556 int av_grow_packet(AVPacket *pkt, int grow_by);
4557 
4558 /**
4559  * Initialize a reference-counted packet from av_malloc()ed data.
4560  *
4561  * @param pkt packet to be initialized. This function will set the data, size,
4562  * buf and destruct fields, all others are left untouched.
4563  * @param data Data allocated by av_malloc() to be used as packet data. If this
4564  * function returns successfully, the data is owned by the underlying AVBuffer.
4565  * The caller may not access the data through other means.
4566  * @param size size of data in bytes, without the padding. I.e. the full buffer
4567  * size is assumed to be size + AV_INPUT_BUFFER_PADDING_SIZE.
4568  *
4569  * @return 0 on success, a negative AVERROR on error
4570  */
4572 
4573 #if FF_API_AVPACKET_OLD_API
4574 /**
4575  * @warning This is a hack - the packet memory allocation stuff is broken. The
4576  * packet is allocated if it was not really allocated.
4577  *
4578  * @deprecated Use av_packet_ref
4579  */
4581 int av_dup_packet(AVPacket *pkt);
4582 /**
4583  * Copy packet, including contents
4584  *
4585  * @return 0 on success, negative AVERROR on fail
4586  */
4587 int av_copy_packet(AVPacket *dst, const AVPacket *src);
4588 
4589 /**
4590  * Copy packet side data
4591  *
4592  * @return 0 on success, negative AVERROR on fail
4593  */
4594 int av_copy_packet_side_data(AVPacket *dst, const AVPacket *src);
4595 
4596 /**
4597  * Free a packet.
4598  *
4599  * @deprecated Use av_packet_unref
4600  *
4601  * @param pkt packet to free
4602  */
4604 void av_free_packet(AVPacket *pkt);
4605 #endif
4606 /**
4607  * Allocate new information of a packet.
4608  *
4609  * @param pkt packet
4610  * @param type side information type
4611  * @param size side information size
4612  * @return pointer to fresh allocated data or NULL otherwise
4613  */
4615  int size);
4616 
4617 /**
4618  * Wrap an existing array as a packet side data.
4619  *
4620  * @param pkt packet
4621  * @param type side information type
4622  * @param data the side data array. It must be allocated with the av_malloc()
4623  * family of functions. The ownership of the data is transferred to
4624  * pkt.
4625  * @param size side information size
4626  * @return a non-negative number on success, a negative AVERROR code on
4627  * failure. On failure, the packet is unchanged and the data remains
4628  * owned by the caller.
4629  */
4631  uint8_t *data, size_t size);
4632 
4633 /**
4634  * Shrink the already allocated side data buffer
4635  *
4636  * @param pkt packet
4637  * @param type side information type
4638  * @param size new side information size
4639  * @return 0 on success, < 0 on failure
4640  */
4642  int size);
4643 
4644 /**
4645  * Get side information from packet.
4646  *
4647  * @param pkt packet
4648  * @param type desired side information type
4649  * @param size pointer for side information size to store (optional)
4650  * @return pointer to data if present or NULL otherwise
4651  */
4653  int *size);
4654 
4655 #if FF_API_MERGE_SD_API
4658 
4661 #endif
4662 
4664 
4665 /**
4666  * Pack a dictionary for use in side_data.
4667  *
4668  * @param dict The dictionary to pack.
4669  * @param size pointer to store the size of the returned data
4670  * @return pointer to data if successful, NULL otherwise
4671  */
4673 /**
4674  * Unpack a dictionary from side_data.
4675  *
4676  * @param data data from side_data
4677  * @param size size of the data
4678  * @param dict the metadata storage dictionary
4679  * @return 0 on success, < 0 on failure
4680  */
4681 int av_packet_unpack_dictionary(const uint8_t *data, int size, AVDictionary **dict);
4682 
4683 
4684 /**
4685  * Convenience function to free all the side data stored.
4686  * All the other fields stay untouched.
4687  *
4688  * @param pkt packet
4689  */
4691 
4692 /**
4693  * Setup a new reference to the data described by a given packet
4694  *
4695  * If src is reference-counted, setup dst as a new reference to the
4696  * buffer in src. Otherwise allocate a new buffer in dst and copy the
4697  * data from src into it.
4698  *
4699  * All the other fields are copied from src.
4700  *
4701  * @see av_packet_unref
4702  *
4703  * @param dst Destination packet
4704  * @param src Source packet
4705  *
4706  * @return 0 on success, a negative AVERROR on error.
4707  */
4708 int av_packet_ref(AVPacket *dst, const AVPacket *src);
4709 
4710 /**
4711  * Wipe the packet.
4712  *
4713  * Unreference the buffer referenced by the packet and reset the
4714  * remaining packet fields to their default values.
4715  *
4716  * @param pkt The packet to be unreferenced.
4717  */
4719 
4720 /**
4721  * Move every field in src to dst and reset src.
4722  *
4723  * @see av_packet_unref
4724  *
4725  * @param src Source packet, will be reset
4726  * @param dst Destination packet
4727  */
4729 
4730 /**
4731  * Copy only "properties" fields from src to dst.
4732  *
4733  * Properties for the purpose of this function are all the fields
4734  * beside those related to the packet data (buf, data, size)
4735  *
4736  * @param dst Destination packet
4737  * @param src Source packet
4738  *
4739  * @return 0 on success AVERROR on failure.
4740  */
4741 int av_packet_copy_props(AVPacket *dst, const AVPacket *src);
4742 
4743 /**
4744  * Convert valid timing fields (timestamps / durations) in a packet from one
4745  * timebase to another. Timestamps with unknown values (AV_NOPTS_VALUE) will be
4746  * ignored.
4747  *
4748  * @param pkt packet on which the conversion will be performed
4749  * @param tb_src source timebase, in which the timing fields in pkt are
4750  * expressed
4751  * @param tb_dst destination timebase, to which the timing fields will be
4752  * converted
4753  */
4754 void av_packet_rescale_ts(AVPacket *pkt, AVRational tb_src, AVRational tb_dst);
4755 
4756 /**
4757  * @}
4758  */
4759 
4760 /**
4761  * @addtogroup lavc_decoding
4762  * @{
4763  */
4764 
4765 /**
4766  * Find a registered decoder with a matching codec ID.
4767  *
4768  * @param id AVCodecID of the requested decoder
4769  * @return A decoder if one was found, NULL otherwise.
4770  */
4772 
4773 /**
4774  * Find a registered decoder with the specified name.
4775  *
4776  * @param name name of the requested decoder
4777  * @return A decoder if one was found, NULL otherwise.
4778  */
4780 
4781 /**
4782  * The default callback for AVCodecContext.get_buffer2(). It is made public so
4783  * it can be called by custom get_buffer2() implementations for decoders without
4784  * AV_CODEC_CAP_DR1 set.
4785  */
4787 
4788 #if FF_API_EMU_EDGE
4789 /**
4790  * Return the amount of padding in pixels which the get_buffer callback must
4791  * provide around the edge of the image for codecs which do not have the
4792  * CODEC_FLAG_EMU_EDGE flag.
4793  *
4794  * @return Required padding in pixels.
4795  *
4796  * @deprecated CODEC_FLAG_EMU_EDGE is deprecated, so this function is no longer
4797  * needed
4798  */
4800 unsigned avcodec_get_edge_width(void);
4801 #endif
4802 
4803 /**
4804  * Modify width and height values so that they will result in a memory
4805  * buffer that is acceptable for the codec if you do not use any horizontal
4806  * padding.
4807  *
4808  * May only be used if a codec with AV_CODEC_CAP_DR1 has been opened.
4809  */
4811 
4812 /**
4813  * Modify width and height values so that they will result in a memory
4814  * buffer that is acceptable for the codec if you also ensure that all
4815  * line sizes are a multiple of the respective linesize_align[i].
4816  *
4817  * May only be used if a codec with AV_CODEC_CAP_DR1 has been opened.
4818  */
4820  int linesize_align[AV_NUM_DATA_POINTERS]);
4821 
4822 /**
4823  * Converts AVChromaLocation to swscale x/y chroma position.
4824  *
4825  * The positions represent the chroma (0,0) position in a coordinates system
4826  * with luma (0,0) representing the origin and luma(1,1) representing 256,256
4827  *
4828  * @param xpos horizontal chroma sample position
4829  * @param ypos vertical chroma sample position
4830  */
4831 int avcodec_enum_to_chroma_pos(int *xpos, int *ypos, enum AVChromaLocation pos);
4832 
4833 /**
4834  * Converts swscale x/y chroma position to AVChromaLocation.
4835  *
4836  * The positions represent the chroma (0,0) position in a coordinates system
4837  * with luma (0,0) representing the origin and luma(1,1) representing 256,256
4838  *
4839  * @param xpos horizontal chroma sample position
4840  * @param ypos vertical chroma sample position
4841  */
4842 enum AVChromaLocation avcodec_chroma_pos_to_enum(int xpos, int ypos);
4843 
4844 /**
4845  * Decode the audio frame of size avpkt->size from avpkt->data into frame.
4846  *
4847  * Some decoders may support multiple frames in a single AVPacket. Such
4848  * decoders would then just decode the first frame and the return value would be
4849  * less than the packet size. In this case, avcodec_decode_audio4 has to be
4850  * called again with an AVPacket containing the remaining data in order to
4851  * decode the second frame, etc... Even if no frames are returned, the packet
4852  * needs to be fed to the decoder with remaining data until it is completely
4853  * consumed or an error occurs.
4854  *
4855  * Some decoders (those marked with AV_CODEC_CAP_DELAY) have a delay between input
4856  * and output. This means that for some packets they will not immediately
4857  * produce decoded output and need to be flushed at the end of decoding to get
4858  * all the decoded data. Flushing is done by calling this function with packets
4859  * with avpkt->data set to NULL and avpkt->size set to 0 until it stops
4860  * returning samples. It is safe to flush even those decoders that are not
4861  * marked with AV_CODEC_CAP_DELAY, then no samples will be returned.
4862  *
4863  * @warning The input buffer, avpkt->data must be AV_INPUT_BUFFER_PADDING_SIZE
4864  * larger than the actual read bytes because some optimized bitstream
4865  * readers read 32 or 64 bits at once and could read over the end.
4866  *
4867  * @note The AVCodecContext MUST have been opened with @ref avcodec_open2()
4868  * before packets may be fed to the decoder.
4869  *
4870  * @param avctx the codec context
4871  * @param[out] frame The AVFrame in which to store decoded audio samples.
4872  * The decoder will allocate a buffer for the decoded frame by
4873  * calling the AVCodecContext.get_buffer2() callback.
4874  * When AVCodecContext.refcounted_frames is set to 1, the frame is
4875  * reference counted and the returned reference belongs to the
4876  * caller. The caller must release the frame using av_frame_unref()
4877  * when the frame is no longer needed. The caller may safely write
4878  * to the frame if av_frame_is_writable() returns 1.
4879  * When AVCodecContext.refcounted_frames is set to 0, the returned
4880  * reference belongs to the decoder and is valid only until the
4881  * next call to this function or until closing or flushing the
4882  * decoder. The caller may not write to it.
4883  * @param[out] got_frame_ptr Zero if no frame could be decoded, otherwise it is
4884  * non-zero. Note that this field being set to zero
4885  * does not mean that an error has occurred. For
4886  * decoders with AV_CODEC_CAP_DELAY set, no given decode
4887  * call is guaranteed to produce a frame.
4888  * @param[in] avpkt The input AVPacket containing the input buffer.
4889  * At least avpkt->data and avpkt->size should be set. Some
4890  * decoders might also require additional fields to be set.
4891  * @return A negative error code is returned if an error occurred during
4892  * decoding, otherwise the number of bytes consumed from the input
4893  * AVPacket is returned.
4894  *
4895 * @deprecated Use avcodec_send_packet() and avcodec_receive_frame().
4896  */
4899  int *got_frame_ptr, const AVPacket *avpkt);
4900 
4901 /**
4902  * Decode the video frame of size avpkt->size from avpkt->data into picture.
4903  * Some decoders may support multiple frames in a single AVPacket, such
4904  * decoders would then just decode the first frame.
4905  *
4906  * @warning The input buffer must be AV_INPUT_BUFFER_PADDING_SIZE larger than
4907  * the actual read bytes because some optimized bitstream readers read 32 or 64
4908  * bits at once and could read over the end.
4909  *
4910  * @warning The end of the input buffer buf should be set to 0 to ensure that
4911  * no overreading happens for damaged MPEG streams.
4912  *
4913  * @note Codecs which have the AV_CODEC_CAP_DELAY capability set have a delay
4914  * between input and output, these need to be fed with avpkt->data=NULL,
4915  * avpkt->size=0 at the end to return the remaining frames.
4916  *
4917  * @note The AVCodecContext MUST have been opened with @ref avcodec_open2()
4918  * before packets may be fed to the decoder.
4919  *
4920  * @param avctx the codec context
4921  * @param[out] picture The AVFrame in which the decoded video frame will be stored.
4922  * Use av_frame_alloc() to get an AVFrame. The codec will
4923  * allocate memory for the actual bitmap by calling the
4924  * AVCodecContext.get_buffer2() callback.
4925  * When AVCodecContext.refcounted_frames is set to 1, the frame is
4926  * reference counted and the returned reference belongs to the
4927  * caller. The caller must release the frame using av_frame_unref()
4928  * when the frame is no longer needed. The caller may safely write
4929  * to the frame if av_frame_is_writable() returns 1.
4930  * When AVCodecContext.refcounted_frames is set to 0, the returned
4931  * reference belongs to the decoder and is valid only until the
4932  * next call to this function or until closing or flushing the
4933  * decoder. The caller may not write to it.
4934  *
4935  * @param[in] avpkt The input AVPacket containing the input buffer.
4936  * You can create such packet with av_init_packet() and by then setting
4937  * data and size, some decoders might in addition need other fields like
4938  * flags&AV_PKT_FLAG_KEY. All decoders are designed to use the least
4939  * fields possible.
4940  * @param[in,out] got_picture_ptr Zero if no frame could be decompressed, otherwise, it is nonzero.
4941  * @return On error a negative value is returned, otherwise the number of bytes
4942  * used or zero if no frame could be decompressed.
4943  *
4944  * @deprecated Use avcodec_send_packet() and avcodec_receive_frame().
4945  */
4947 int avcodec_decode_video2(AVCodecContext *avctx, AVFrame *picture,
4948  int *got_picture_ptr,
4949  const AVPacket *avpkt);
4950 
4951 /**
4952  * Decode a subtitle message.
4953  * Return a negative value on error, otherwise return the number of bytes used.
4954  * If no subtitle could be decompressed, got_sub_ptr is zero.
4955  * Otherwise, the subtitle is stored in *sub.
4956  * Note that AV_CODEC_CAP_DR1 is not available for subtitle codecs. This is for
4957  * simplicity, because the performance difference is expect to be negligible
4958  * and reusing a get_buffer written for video codecs would probably perform badly
4959  * due to a potentially very different allocation pattern.
4960  *
4961  * Some decoders (those marked with AV_CODEC_CAP_DELAY) have a delay between input
4962  * and output. This means that for some packets they will not immediately
4963  * produce decoded output and need to be flushed at the end of decoding to get
4964  * all the decoded data. Flushing is done by calling this function with packets
4965  * with avpkt->data set to NULL and avpkt->size set to 0 until it stops
4966  * returning subtitles. It is safe to flush even those decoders that are not
4967  * marked with AV_CODEC_CAP_DELAY, then no subtitles will be returned.
4968  *
4969  * @note The AVCodecContext MUST have been opened with @ref avcodec_open2()
4970  * before packets may be fed to the decoder.
4971  *
4972  * @param avctx the codec context
4973  * @param[out] sub The Preallocated AVSubtitle in which the decoded subtitle will be stored,
4974  * must be freed with avsubtitle_free if *got_sub_ptr is set.
4975  * @param[in,out] got_sub_ptr Zero if no subtitle could be decompressed, otherwise, it is nonzero.
4976  * @param[in] avpkt The input AVPacket containing the input buffer.
4977  */
4979  int *got_sub_ptr,
4980  AVPacket *avpkt);
4981 
4982 /**
4983  * Supply raw packet data as input to a decoder.
4984  *
4985  * Internally, this call will copy relevant AVCodecContext fields, which can
4986  * influence decoding per-packet, and apply them when the packet is actually
4987  * decoded. (For example AVCodecContext.skip_frame, which might direct the
4988  * decoder to drop the frame contained by the packet sent with this function.)
4989  *
4990  * @warning The input buffer, avpkt->data must be AV_INPUT_BUFFER_PADDING_SIZE
4991  * larger than the actual read bytes because some optimized bitstream
4992  * readers read 32 or 64 bits at once and could read over the end.
4993  *
4994  * @warning Do not mix this API with the legacy API (like avcodec_decode_video2())
4995  * on the same AVCodecContext. It will return unexpected results now
4996  * or in future libavcodec versions.
4997  *
4998  * @note The AVCodecContext MUST have been opened with @ref avcodec_open2()
4999  * before packets may be fed to the decoder.
5000  *
5001  * @param avctx codec context
5002  * @param[in] avpkt The input AVPacket. Usually, this will be a single video
5003  * frame, or several complete audio frames.
5004  * Ownership of the packet remains with the caller, and the
5005  * decoder will not write to the packet. The decoder may create
5006  * a reference to the packet data (or copy it if the packet is
5007  * not reference-counted).
5008  * Unlike with older APIs, the packet is always fully consumed,
5009  * and if it contains multiple frames (e.g. some audio codecs),
5010  * will require you to call avcodec_receive_frame() multiple
5011  * times afterwards before you can send a new packet.
5012  * It can be NULL (or an AVPacket with data set to NULL and
5013  * size set to 0); in this case, it is considered a flush
5014  * packet, which signals the end of the stream. Sending the
5015  * first flush packet will return success. Subsequent ones are
5016  * unnecessary and will return AVERROR_EOF. If the decoder
5017  * still has frames buffered, it will return them after sending
5018  * a flush packet.
5019  *
5020  * @return 0 on success, otherwise negative error code:
5021  * AVERROR(EAGAIN): input is not accepted in the current state - user
5022  * must read output with avcodec_receive_frame() (once
5023  * all output is read, the packet should be resent, and
5024  * the call will not fail with EAGAIN).
5025  * AVERROR_EOF: the decoder has been flushed, and no new packets can
5026  * be sent to it (also returned if more than 1 flush
5027  * packet is sent)
5028  * AVERROR(EINVAL): codec not opened, it is an encoder, or requires flush
5029  * AVERROR(ENOMEM): failed to add packet to internal queue, or similar
5030  * other errors: legitimate decoding errors
5031  */
5032 int avcodec_send_packet(AVCodecContext *avctx, const AVPacket *avpkt);
5033 
5034 /**
5035  * Return decoded output data from a decoder.
5036  *
5037  * @param avctx codec context
5038  * @param frame This will be set to a reference-counted video or audio
5039  * frame (depending on the decoder type) allocated by the
5040  * decoder. Note that the function will always call
5041  * av_frame_unref(frame) before doing anything else.
5042  *
5043  * @return
5044  * 0: success, a frame was returned
5045  * AVERROR(EAGAIN): output is not available in this state - user must try
5046  * to send new input
5047  * AVERROR_EOF: the decoder has been fully flushed, and there will be
5048  * no more output frames
5049  * AVERROR(EINVAL): codec not opened, or it is an encoder
5050  * other negative values: legitimate decoding errors
5051  */
5053 
5054 /**
5055  * Supply a raw video or audio frame to the encoder. Use avcodec_receive_packet()
5056  * to retrieve buffered output packets.
5057  *
5058  * @param avctx codec context
5059  * @param[in] frame AVFrame containing the raw audio or video frame to be encoded.
5060  * Ownership of the frame remains with the caller, and the
5061  * encoder will not write to the frame. The encoder may create
5062  * a reference to the frame data (or copy it if the frame is
5063  * not reference-counted).
5064  * It can be NULL, in which case it is considered a flush
5065  * packet. This signals the end of the stream. If the encoder
5066  * still has packets buffered, it will return them after this
5067  * call. Once flushing mode has been entered, additional flush
5068  * packets are ignored, and sending frames will return
5069  * AVERROR_EOF.
5070  *
5071  * For audio:
5072  * If AV_CODEC_CAP_VARIABLE_FRAME_SIZE is set, then each frame
5073  * can have any number of samples.
5074  * If it is not set, frame->nb_samples must be equal to
5075  * avctx->frame_size for all frames except the last.
5076  * The final frame may be smaller than avctx->frame_size.
5077  * @return 0 on success, otherwise negative error code:
5078  * AVERROR(EAGAIN): input is not accepted in the current state - user
5079  * must read output with avcodec_receive_packet() (once
5080  * all output is read, the packet should be resent, and
5081  * the call will not fail with EAGAIN).
5082  * AVERROR_EOF: the encoder has been flushed, and no new frames can
5083  * be sent to it
5084  * AVERROR(EINVAL): codec not opened, refcounted_frames not set, it is a
5085  * decoder, or requires flush
5086  * AVERROR(ENOMEM): failed to add packet to internal queue, or similar
5087  * other errors: legitimate decoding errors
5088  */
5089 int avcodec_send_frame(AVCodecContext *avctx, const AVFrame *frame);
5090 
5091 /**
5092  * Read encoded data from the encoder.
5093  *
5094  * @param avctx codec context
5095  * @param avpkt This will be set to a reference-counted packet allocated by the
5096  * encoder. Note that the function will always call
5097  * av_frame_unref(frame) before doing anything else.
5098  * @return 0 on success, otherwise negative error code:
5099  * AVERROR(EAGAIN): output is not available in the current state - user
5100  * must try to send input
5101  * AVERROR_EOF: the encoder has been fully flushed, and there will be
5102  * no more output packets
5103  * AVERROR(EINVAL): codec not opened, or it is an encoder
5104  * other errors: legitimate decoding errors
5105  */
5106 int avcodec_receive_packet(AVCodecContext *avctx, AVPacket *avpkt);
5107 
5108 
5109 /**
5110  * @defgroup lavc_parsing Frame parsing
5111  * @{
5112  */
5113 
5116  AV_PICTURE_STRUCTURE_TOP_FIELD, //< coded as top field
5117  AV_PICTURE_STRUCTURE_BOTTOM_FIELD, //< coded as bottom field
5118  AV_PICTURE_STRUCTURE_FRAME, //< coded as frame
5119 };
5120 
5121 typedef struct AVCodecParserContext {
5122  void *priv_data;
5124  int64_t frame_offset; /* offset of the current frame */
5125  int64_t cur_offset; /* current offset
5126  (incremented by each av_parser_parse()) */
5127  int64_t next_frame_offset; /* offset of the next frame */
5128  /* video info */
5129  int pict_type; /* XXX: Put it back in AVCodecContext. */
5130  /**
5131  * This field is used for proper frame duration computation in lavf.
5132  * It signals, how much longer the frame duration of the current frame
5133  * is compared to normal frame duration.
5134  *
5135  * frame_duration = (1 + repeat_pict) * time_base
5136  *
5137  * It is used by codecs like H.264 to display telecined material.
5138  */
5139  int repeat_pict; /* XXX: Put it back in AVCodecContext. */
5140  int64_t pts; /* pts of the current frame */
5141  int64_t dts; /* dts of the current frame */
5142 
5143  /* private data */
5144  int64_t last_pts;
5145  int64_t last_dts;
5147 
5148 #define AV_PARSER_PTS_NB 4
5153 
5154  int flags;
5155 #define PARSER_FLAG_COMPLETE_FRAMES 0x0001
5156 #define PARSER_FLAG_ONCE 0x0002
5157 /// Set if the parser has a valid file offset
5158 #define PARSER_FLAG_FETCHED_OFFSET 0x0004
5159 #define PARSER_FLAG_USE_CODEC_TS 0x1000
5160 
5161  int64_t offset; ///< byte offset from starting packet start
5163 
5164  /**
5165  * Set by parser to 1 for key frames and 0 for non-key frames.
5166  * It is initialized to -1, so if the parser doesn't set this flag,
5167  * old-style fallback using AV_PICTURE_TYPE_I picture type as key frames
5168  * will be used.
5169  */
5171 
5172 #if FF_API_CONVERGENCE_DURATION
5173  /**
5174  * @deprecated unused
5175  */
5178 #endif
5179 
5180  // Timestamp generation support:
5181  /**
5182  * Synchronization point for start of timestamp generation.
5183  *
5184  * Set to >0 for sync point, 0 for no sync point and <0 for undefined
5185  * (default).
5186  *
5187  * For example, this corresponds to presence of H.264 buffering period
5188  * SEI message.
5189  */
5191 
5192  /**
5193  * Offset of the current timestamp against last timestamp sync point in
5194  * units of AVCodecContext.time_base.
5195  *
5196  * Set to INT_MIN when dts_sync_point unused. Otherwise, it must
5197  * contain a valid timestamp offset.
5198  *
5199  * Note that the timestamp of sync point has usually a nonzero
5200  * dts_ref_dts_delta, which refers to the previous sync point. Offset of
5201  * the next frame after timestamp sync point will be usually 1.
5202  *
5203  * For example, this corresponds to H.264 cpb_removal_delay.
5204  */
5206 
5207  /**
5208  * Presentation delay of current frame in units of AVCodecContext.time_base.
5209  *
5210  * Set to INT_MIN when dts_sync_point unused. Otherwise, it must
5211  * contain valid non-negative timestamp delta (presentation time of a frame
5212  * must not lie in the past).
5213  *
5214  * This delay represents the difference between decoding and presentation
5215  * time of the frame.
5216  *
5217  * For example, this corresponds to H.264 dpb_output_delay.
5218  */
5220 
5221  /**
5222  * Position of the packet in file.
5223  *
5224  * Analogous to cur_frame_pts/dts
5225  */
5227 
5228  /**
5229  * Byte position of currently parsed frame in stream.
5230  */
5231  int64_t pos;
5232 
5233  /**
5234  * Previous frame byte position.
5235  */
5236  int64_t last_pos;
5237 
5238  /**
5239  * Duration of the current frame.
5240  * For audio, this is in units of 1 / AVCodecContext.sample_rate.
5241  * For all other types, this is in units of AVCodecContext.time_base.
5242  */
5244 
5246 
5247  /**
5248  * Indicate whether a picture is coded as a frame, top field or bottom field.
5249  *
5250  * For example, H.264 field_pic_flag equal to 0 corresponds to
5251  * AV_PICTURE_STRUCTURE_FRAME. An H.264 picture with field_pic_flag
5252  * equal to 1 and bottom_field_flag equal to 0 corresponds to
5253  * AV_PICTURE_STRUCTURE_TOP_FIELD.
5254  */
5256 
5257  /**
5258  * Picture number incremented in presentation or output order.
5259  * This field may be reinitialized at the first picture of a new sequence.
5260  *
5261  * For example, this corresponds to H.264 PicOrderCnt.
5262  */
5264 
5265  /**
5266  * Dimensions of the decoded video intended for presentation.
5267  */
5268  int width;
5269  int height;
5270 
5271  /**
5272  * Dimensions of the coded video.
5273  */
5276 
5277  /**
5278  * The format of the coded data, corresponds to enum AVPixelFormat for video
5279  * and for enum AVSampleFormat for audio.
5280  *
5281  * Note that a decoder can have considerable freedom in how exactly it
5282  * decodes the data, so the format reported here might be different from the
5283  * one returned by a decoder.
5284  */
5285  int format;
5287 
5288 typedef struct AVCodecParser {
5289  int codec_ids[5]; /* several codec IDs are permitted */
5292  /* This callback never returns an error, a negative value means that
5293  * the frame start was in a previous packet. */
5295  AVCodecContext *avctx,
5296  const uint8_t **poutbuf, int *poutbuf_size,
5297  const uint8_t *buf, int buf_size);
5299  int (*split)(AVCodecContext *avctx, const uint8_t *buf, int buf_size);
5301 } AVCodecParser;
5302