FFmpeg
internal.h
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1 /*
2  * copyright (c) 2001 Fabrice Bellard
3  *
4  * This file is part of FFmpeg.
5  *
6  * FFmpeg is free software; you can redistribute it and/or
7  * modify it under the terms of the GNU Lesser General Public
8  * License as published by the Free Software Foundation; either
9  * version 2.1 of the License, or (at your option) any later version.
10  *
11  * FFmpeg is distributed in the hope that it will be useful,
12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14  * Lesser General Public License for more details.
15  *
16  * You should have received a copy of the GNU Lesser General Public
17  * License along with FFmpeg; if not, write to the Free Software
18  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19  */
20 
21 #ifndef AVFORMAT_INTERNAL_H
22 #define AVFORMAT_INTERNAL_H
23 
24 #include <stdint.h>
25 
27 
28 #include "avformat.h"
29 #include "os_support.h"
30 
31 #define MAX_URL_SIZE 4096
32 
33 /** size of probe buffer, for guessing file type from file contents */
34 #define PROBE_BUF_MIN 2048
35 #define PROBE_BUF_MAX (1 << 20)
36 
37 #ifdef DEBUG
38 # define hex_dump_debug(class, buf, size) av_hex_dump_log(class, AV_LOG_DEBUG, buf, size)
39 #else
40 # define hex_dump_debug(class, buf, size) do { if (0) av_hex_dump_log(class, AV_LOG_DEBUG, buf, size); } while(0)
41 #endif
42 
43 /**
44  * For an AVInputFormat with this flag set read_close() needs to be called
45  * by the caller upon read_header() failure.
46  */
47 #define FF_FMT_INIT_CLEANUP (1 << 0)
48 
49 typedef struct AVCodecTag {
50  enum AVCodecID id;
51  unsigned int tag;
52 } AVCodecTag;
53 
54 typedef struct CodecMime{
55  char str[32];
56  enum AVCodecID id;
57 } CodecMime;
58 
59 /*************************************************/
60 /* fractional numbers for exact pts handling */
61 
62 /**
63  * The exact value of the fractional number is: 'val + num / den'.
64  * num is assumed to be 0 <= num < den.
65  */
66 typedef struct FFFrac {
67  int64_t val, num, den;
68 } FFFrac;
69 
70 
71 typedef struct FFFormatContext {
72  /**
73  * The public context.
74  */
76 
77  /**
78  * Number of streams relevant for interleaving.
79  * Muxing only.
80  */
82 
83  /**
84  * Whether the timestamp shift offset has already been determined.
85  * -1: disabled, 0: not yet determined, 1: determined.
86  */
87  enum {
92 #define AVOID_NEGATIVE_TS_ENABLED(status) ((status) >= 0)
93 
94  /**
95  * The interleavement function in use. Always set for muxers.
96  */
98  int flush, int has_packet);
99 
100  /**
101  * This buffer is only needed when packets were already buffered but
102  * not decoded, for example to get the codec parameters in MPEG
103  * streams.
104  */
106 
107  /* av_seek_frame() support */
108  int64_t data_offset; /**< offset of the first packet */
109 
110  /**
111  * Raw packets from the demuxer, prior to parsing and decoding.
112  * This buffer is used for buffering packets until the codec can
113  * be identified, as parsing cannot be done without knowing the
114  * codec.
115  */
117  /**
118  * Packets split by the parser get queued here.
119  */
121  /**
122  * The generic code uses this as a temporary packet
123  * to parse packets or for muxing, especially flushing.
124  * For demuxers, it may also be used for other means
125  * for short periods that are guaranteed not to overlap
126  * with calls to av_read_frame() (or ff_read_packet())
127  * or with each other.
128  * It may be used by demuxers as a replacement for
129  * stack packets (unless they call one of the aforementioned
130  * functions with their own AVFormatContext).
131  * Every user has to ensure that this packet is blank
132  * after using it.
133  */
135 
136  /**
137  * Used to hold temporary packets for the generic demuxing code.
138  * When muxing, it may be used by muxers to hold packets (even
139  * permanent ones).
140  */
142  /**
143  * Sum of the size of packets in raw_packet_buffer, in bytes.
144  */
146 
147 #if FF_API_COMPUTE_PKT_FIELDS2
148  int missing_ts_warning;
149 #endif
150 
152 
154 
155  /**
156  * Timestamp of the end of the shortest stream.
157  */
158  int64_t shortest_end;
159 
160  /**
161  * Whether or not avformat_init_output has already been called
162  */
164 
165  /**
166  * Whether or not avformat_init_output fully initialized streams
167  */
169 
170  /**
171  * ID3v2 tag useful for MP3 demuxing
172  */
174 
175  /*
176  * Prefer the codec framerate for avg_frame_rate computation.
177  */
179 
180  /**
181  * Set if chapter ids are strictly monotonic.
182  */
184 
185  /**
186  * Contexts and child contexts do not contain a metadata option
187  */
188  int metafree;
190 
192 {
193  return (FFFormatContext*)s;
194 }
195 
196 typedef struct FFStream {
197  /**
198  * The public context.
199  */
201 
202  /**
203  * Set to 1 if the codec allows reordering, so pts can be different
204  * from dts.
205  */
206  int reorder;
207 
208  /**
209  * bitstream filter to run on stream
210  * - encoding: Set by muxer using ff_stream_add_bitstream_filter
211  * - decoding: unused
212  */
214 
215  /**
216  * Whether or not check_bitstream should still be run on each packet
217  */
219 
220  /**
221  * The codec context used by avformat_find_stream_info, the parser, etc.
222  */
224  /**
225  * 1 if avctx has been initialized with the values from the codec parameters
226  */
228 
229  /* the context for extracting extradata in find_stream_info()
230  * inited=1/bsf=NULL signals that extracting is not possible (codec not
231  * supported) */
232  struct {
233  struct AVBSFContext *bsf;
234  int inited;
236 
237  /**
238  * Whether the internal avctx needs to be updated from codecpar (after a late change to codecpar)
239  */
241 
243 
245 
246  /**
247  * Stream information used internally by avformat_find_stream_info()
248  */
250 
251  AVIndexEntry *index_entries; /**< Only used if the format does not
252  support seeking natively. */
255 
258 
259  /**
260  * stream probing state
261  * -1 -> probing finished
262  * 0 -> no probing requested
263  * rest -> perform probing with request_probe being the minimum score to accept.
264  */
266  /**
267  * Indicates that everything up to the next keyframe
268  * should be discarded.
269  */
271 
272  /**
273  * Number of samples to skip at the start of the frame decoded from the next packet.
274  */
276 
277  /**
278  * If not 0, the number of samples that should be skipped from the start of
279  * the stream (the samples are removed from packets with pts==0, which also
280  * assumes negative timestamps do not happen).
281  * Intended for use with formats such as mp3 with ad-hoc gapless audio
282  * support.
283  */
285 
286  /**
287  * If not 0, the first audio sample that should be discarded from the stream.
288  * This is broken by design (needs global sample count), but can't be
289  * avoided for broken by design formats such as mp3 with ad-hoc gapless
290  * audio support.
291  */
293 
294  /**
295  * The sample after last sample that is intended to be discarded after
296  * first_discard_sample. Works on frame boundaries only. Used to prevent
297  * early EOF if the gapless info is broken (considered concatenated mp3s).
298  */
300 
301  /**
302  * Number of internally decoded frames, used internally in libavformat, do not access
303  * its lifetime differs from info which is why it is not in that structure.
304  */
306 
307  /**
308  * Timestamp offset added to timestamps before muxing
309  */
310  int64_t mux_ts_offset;
311 
312  /**
313  * This is the lowest ts allowed in this track; it may be set by the muxer
314  * during init or write_header and influences the automatic timestamp
315  * shifting code.
316  */
318 
319  /**
320  * Internal data to check for wrapping of the time stamp
321  */
323 
324  /**
325  * Options for behavior, when a wrap is detected.
326  *
327  * Defined by AV_PTS_WRAP_ values.
328  *
329  * If correction is enabled, there are two possibilities:
330  * If the first time stamp is near the wrap point, the wrap offset
331  * will be subtracted, which will create negative time stamps.
332  * Otherwise the offset will be added.
333  */
335 
336  /**
337  * Internal data to prevent doing update_initial_durations() twice
338  */
340 
341 #define MAX_REORDER_DELAY 16
342 
343  /**
344  * Internal data to generate dts from pts
345  */
348 
350 
351  /**
352  * Internal data to analyze DTS and detect faulty mpeg streams
353  */
355  uint8_t dts_ordered;
356  uint8_t dts_misordered;
357 
358  /**
359  * Internal data to inject global side data
360  */
362 
363  /**
364  * display aspect ratio (0 if unknown)
365  * - encoding: unused
366  * - decoding: Set by libavformat to calculate sample_aspect_ratio internally
367  */
369 
371 
372  /**
373  * last packet in packet_buffer for this stream when muxing.
374  */
376 
377  int64_t last_IP_pts;
379 
380  /**
381  * Number of packets to buffer for codec probing
382  */
384 
385  /* av_read_frame() support */
388 
389  /**
390  * Number of frames that have been demuxed during avformat_find_stream_info()
391  */
393 
394  /**
395  * Stream Identifier
396  * This is the MPEG-TS stream identifier +1
397  * 0 means unknown
398  */
400 
401  // Timestamp generation support:
402  /**
403  * Timestamp corresponding to the last dts sync point.
404  *
405  * Initialized when AVCodecParserContext.dts_sync_point >= 0 and
406  * a DTS is received from the underlying container. Otherwise set to
407  * AV_NOPTS_VALUE by default.
408  */
409  int64_t first_dts;
410  int64_t cur_dts;
411 } FFStream;
412 
414 {
415  return (FFStream*)st;
416 }
417 
418 static av_always_inline const FFStream *cffstream(const AVStream *st)
419 {
420  return (FFStream*)st;
421 }
422 
423 #ifdef __GNUC__
424 #define dynarray_add(tab, nb_ptr, elem)\
425 do {\
426  __typeof__(tab) _tab = (tab);\
427  __typeof__(elem) _elem = (elem);\
428  (void)sizeof(**_tab == _elem); /* check that types are compatible */\
429  av_dynarray_add(_tab, nb_ptr, _elem);\
430 } while(0)
431 #else
432 #define dynarray_add(tab, nb_ptr, elem)\
433 do {\
434  av_dynarray_add((tab), nb_ptr, (elem));\
435 } while(0)
436 #endif
437 
438 
440 
441 /**
442  * Automatically create sub-directories
443  *
444  * @param path will create sub-directories by path
445  * @return 0, or < 0 on error
446  */
447 int ff_mkdir_p(const char *path);
448 
449 /**
450  * Write hexadecimal string corresponding to given binary data. The string
451  * is zero-terminated.
452  *
453  * @param buf the output string is written here;
454  * needs to be at least 2 * size + 1 bytes long.
455  * @param src the input data to be transformed.
456  * @param size the size (in byte) of src.
457  * @param lowercase determines whether to use the range [0-9a-f] or [0-9A-F].
458  * @return buf.
459  */
460 char *ff_data_to_hex(char *buf, const uint8_t *src, int size, int lowercase);
461 
462 /**
463  * Parse a string of hexadecimal strings. Any space between the hexadecimal
464  * digits is ignored.
465  *
466  * @param data if non-null, the parsed data is written to this pointer
467  * @param p the string to parse
468  * @return the number of bytes written (or to be written, if data is null)
469  */
470 int ff_hex_to_data(uint8_t *data, const char *p);
471 
472 #define NTP_OFFSET 2208988800ULL
473 #define NTP_OFFSET_US (NTP_OFFSET * 1000000ULL)
474 
475 /** Get the current time since NTP epoch in microseconds. */
476 uint64_t ff_ntp_time(void);
477 
478 /**
479  * Get the NTP time stamp formatted as per the RFC-5905.
480  *
481  * @param ntp_time NTP time in micro seconds (since NTP epoch)
482  * @return the formatted NTP time stamp
483  */
484 uint64_t ff_get_formatted_ntp_time(uint64_t ntp_time_us);
485 
486 /**
487  * Parse the NTP time in micro seconds (since NTP epoch).
488  *
489  * @param ntp_ts NTP time stamp formatted as per the RFC-5905.
490  * @return the time in micro seconds (since NTP epoch)
491  */
492 uint64_t ff_parse_ntp_time(uint64_t ntp_ts);
493 
494 /**
495  * Append the media-specific SDP fragment for the media stream c
496  * to the buffer buff.
497  *
498  * Note, the buffer needs to be initialized, since it is appended to
499  * existing content.
500  *
501  * @param buff the buffer to append the SDP fragment to
502  * @param size the size of the buff buffer
503  * @param st the AVStream of the media to describe
504  * @param idx the global stream index
505  * @param dest_addr the destination address of the media stream, may be NULL
506  * @param dest_type the destination address type, may be NULL
507  * @param port the destination port of the media stream, 0 if unknown
508  * @param ttl the time to live of the stream, 0 if not multicast
509  * @param fmt the AVFormatContext, which might contain options modifying
510  * the generated SDP
511  * @return 0 on success, a negative error code on failure
512  */
513 int ff_sdp_write_media(char *buff, int size, const AVStream *st, int idx,
514  const char *dest_addr, const char *dest_type,
515  int port, int ttl, AVFormatContext *fmt);
516 
517 /**
518  * Read a whole line of text from AVIOContext. Stop reading after reaching
519  * either a \\n, a \\0 or EOF. The returned string is always \\0-terminated,
520  * and may be truncated if the buffer is too small.
521  *
522  * @param s the read-only AVIOContext
523  * @param buf buffer to store the read line
524  * @param maxlen size of the buffer
525  * @return the length of the string written in the buffer, not including the
526  * final \\0
527  */
528 int ff_get_line(AVIOContext *s, char *buf, int maxlen);
529 
530 /**
531  * Same as ff_get_line but strip the white-space characters in the text tail
532  *
533  * @param s the read-only AVIOContext
534  * @param buf buffer to store the read line
535  * @param maxlen size of the buffer
536  * @return the length of the string written in the buffer
537  */
538 int ff_get_chomp_line(AVIOContext *s, char *buf, int maxlen);
539 
540 #define SPACE_CHARS " \t\r\n"
541 
542 /**
543  * Callback function type for ff_parse_key_value.
544  *
545  * @param key a pointer to the key
546  * @param key_len the number of bytes that belong to the key, including the '='
547  * char
548  * @param dest return the destination pointer for the value in *dest, may
549  * be null to ignore the value
550  * @param dest_len the length of the *dest buffer
551  */
552 typedef void (*ff_parse_key_val_cb)(void *context, const char *key,
553  int key_len, char **dest, int *dest_len);
554 /**
555  * Parse a string with comma-separated key=value pairs. The value strings
556  * may be quoted and may contain escaped characters within quoted strings.
557  *
558  * @param str the string to parse
559  * @param callback_get_buf function that returns where to store the
560  * unescaped value string.
561  * @param context the opaque context pointer to pass to callback_get_buf
562  */
563 void ff_parse_key_value(const char *str, ff_parse_key_val_cb callback_get_buf,
564  void *context);
565 
566 enum AVCodecID ff_guess_image2_codec(const char *filename);
567 
569  enum AVCodecID codec_id);
570 
571 /**
572  * Set the time base and wrapping info for a given stream. This will be used
573  * to interpret the stream's timestamps. If the new time base is invalid
574  * (numerator or denominator are non-positive), it leaves the stream
575  * unchanged.
576  *
577  * @param st stream
578  * @param pts_wrap_bits number of bits effectively used by the pts
579  * (used for wrap control)
580  * @param pts_num time base numerator
581  * @param pts_den time base denominator
582  */
583 void avpriv_set_pts_info(AVStream *st, int pts_wrap_bits,
584  unsigned int pts_num, unsigned int pts_den);
585 
586 /**
587  * Set the timebase for each stream from the corresponding codec timebase and
588  * print it.
589  */
591 
592 /**
593  * Frees a stream without modifying the corresponding AVFormatContext.
594  * Must only be called if the latter doesn't matter or if the stream
595  * is not yet attached to an AVFormatContext.
596  */
597 void ff_free_stream(AVStream **st);
598 /**
599  * Remove a stream from its AVFormatContext and free it.
600  * The stream must be the last stream of the AVFormatContext.
601  */
603 
604 unsigned int ff_codec_get_tag(const AVCodecTag *tags, enum AVCodecID id);
605 
606 enum AVCodecID ff_codec_get_id(const AVCodecTag *tags, unsigned int tag);
607 
608 int ff_is_intra_only(enum AVCodecID id);
609 
610 /**
611  * Select a PCM codec based on the given parameters.
612  *
613  * @param bps bits-per-sample
614  * @param flt floating-point
615  * @param be big-endian
616  * @param sflags signed flags. each bit corresponds to one byte of bit depth.
617  * e.g. the 1st bit indicates if 8-bit should be signed or
618  * unsigned, the 2nd bit indicates if 16-bit should be signed or
619  * unsigned, etc... This is useful for formats such as WAVE where
620  * only 8-bit is unsigned and all other bit depths are signed.
621  * @return a PCM codec id or AV_CODEC_ID_NONE
622  */
623 enum AVCodecID ff_get_pcm_codec_id(int bps, int flt, int be, int sflags);
624 
625 /**
626  * Copy side data from source to destination stream
627  *
628  * @param dst pointer to destination AVStream
629  * @param src pointer to source AVStream
630  * @return >=0 on success, AVERROR code on error
631  */
633 
634 /**
635  * Create a new stream and copy to it all parameters from a source stream, with
636  * the exception of the index field, which is set when the new stream is
637  * created.
638  *
639  * @param dst_ctx pointer to the context in which the new stream is created
640  * @param src pointer to source AVStream
641  * @return pointer to the new stream or NULL on error
642  */
644 
645 /**
646  * Wrap ffurl_move() and log if error happens.
647  *
648  * @param url_src source path
649  * @param url_dst destination path
650  * @return 0 or AVERROR on failure
651  */
652 int ff_rename(const char *url_src, const char *url_dst, void *logctx);
653 
654 /**
655  * Allocate extradata with additional AV_INPUT_BUFFER_PADDING_SIZE at end
656  * which is always set to 0.
657  *
658  * Previously allocated extradata in par will be freed.
659  *
660  * @param size size of extradata
661  * @return 0 if OK, AVERROR_xxx on error
662  */
664 
665 /**
666  * Copies the whilelists from one context to the other
667  */
669 
670 /*
671  * A wrapper around AVFormatContext.io_close that should be used
672  * instead of calling the pointer directly.
673  *
674  * @param s AVFormatContext
675  * @param *pb the AVIOContext to be closed and freed. Can be NULL.
676  * @return >=0 on success, negative AVERROR in case of failure
677  */
679 
680 /* Default io_close callback, not to be used directly, use ff_format_io_close
681  * instead. */
683 
684 /**
685  * Utility function to check if the file uses http or https protocol
686  *
687  * @param s AVFormatContext
688  * @param filename URL or file name to open for writing
689  */
690 int ff_is_http_proto(const char *filename);
691 
692 struct AVBPrint;
693 /**
694  * Finalize buf into extradata and set its size appropriately.
695  */
696 int ff_bprint_to_codecpar_extradata(AVCodecParameters *par, struct AVBPrint *buf);
697 
698 int ff_lock_avformat(void);
699 int ff_unlock_avformat(void);
700 
701 /**
702  * Set AVFormatContext url field to the provided pointer. The pointer must
703  * point to a valid string. The existing url field is freed if necessary. Also
704  * set the legacy filename field to the same string which was provided in url.
705  */
706 void ff_format_set_url(AVFormatContext *s, char *url);
707 
708 void avpriv_register_devices(const AVOutputFormat * const o[], const AVInputFormat * const i[]);
709 
710 #endif /* AVFORMAT_INTERNAL_H */
be
it s the only field you need to keep assuming you have a context There is some magic you don t need to care about around this just let it be(in the first position) for now. Options ------- Then comes the options array. This is what will define the user accessible options. For example
AVCodec
AVCodec.
Definition: codec.h:204
FFStream::skip_samples
int skip_samples
Number of samples to skip at the start of the frame decoded from the next packet.
Definition: internal.h:275
ff_get_pcm_codec_id
enum AVCodecID ff_get_pcm_codec_id(int bps, int flt, int be, int sflags)
Select a PCM codec based on the given parameters.
Definition: utils.c:155
ff_find_decoder
const AVCodec * ff_find_decoder(AVFormatContext *s, const AVStream *st, enum AVCodecID codec_id)
Definition: avformat.c:789
FFStream::inject_global_side_data
int inject_global_side_data
Internal data to inject global side data.
Definition: internal.h:361
ff_ntp_time
uint64_t ff_ntp_time(void)
Get the current time since NTP epoch in microseconds.
Definition: utils.c:258
FFFormatContext::interleave_packet
int(* interleave_packet)(struct AVFormatContext *s, AVPacket *pkt, int flush, int has_packet)
The interleavement function in use.
Definition: internal.h:97
FFFormatContext::prefer_codec_framerate
int prefer_codec_framerate
Definition: internal.h:178
FFStream::bsfc
struct AVBSFContext * bsfc
bitstream filter to run on stream
Definition: internal.h:213
FFStream::first_dts
int64_t first_dts
Timestamp corresponding to the last dts sync point.
Definition: internal.h:409
AVCodecParameters
This struct describes the properties of an encoded stream.
Definition: codec_par.h:54
FFStream::last_IP_pts
int64_t last_IP_pts
Definition: internal.h:377
FFStream::bsf
struct AVBSFContext * bsf
Definition: internal.h:233
ffformatcontext
static av_always_inline FFFormatContext * ffformatcontext(AVFormatContext *s)
Definition: internal.h:191
AVCodecTag::id
enum AVCodecID id
Definition: internal.h:50
ff_get_formatted_ntp_time
uint64_t ff_get_formatted_ntp_time(uint64_t ntp_time_us)
Get the NTP time stamp formatted as per the RFC-5905.
Definition: utils.c:263
FFStream::first_discard_sample
int64_t first_discard_sample
If not 0, the first audio sample that should be discarded from the stream.
Definition: internal.h:292
FFStream::interleaver_chunk_size
int64_t interleaver_chunk_size
Definition: internal.h:256
PacketList
Definition: packet_internal.h:31
data
const char data[16]
Definition: mxf.c:146
FFFormatContext::initialized
int initialized
Whether or not avformat_init_output has already been called.
Definition: internal.h:163
ff_parse_ntp_time
uint64_t ff_parse_ntp_time(uint64_t ntp_ts)
Parse the NTP time in micro seconds (since NTP epoch).
Definition: utils.c:285
ff_stream_clone
AVStream * ff_stream_clone(AVFormatContext *dst_ctx, const AVStream *src)
Create a new stream and copy to it all parameters from a source stream, with the exception of the ind...
Definition: avformat.c:286
AVDictionary
Definition: dict.c:32
ff_get_chomp_line
int ff_get_chomp_line(AVIOContext *s, char *buf, int maxlen)
Same as ff_get_line but strip the white-space characters in the text tail.
Definition: aviobuf.c:817
cffstream
static const av_always_inline FFStream * cffstream(const AVStream *st)
Definition: internal.h:418
FFStream::last_dts_for_order_check
int64_t last_dts_for_order_check
Internal data to analyze DTS and detect faulty mpeg streams.
Definition: internal.h:354
os_support.h
AVBSFContext
The bitstream filter state.
Definition: bsf.h:68
AVIndexEntry
Definition: avformat.h:807
FFFormatContext::shortest_end
int64_t shortest_end
Timestamp of the end of the shortest stream.
Definition: internal.h:158
ff_bprint_to_codecpar_extradata
int ff_bprint_to_codecpar_extradata(AVCodecParameters *par, struct AVBPrint *buf)
Finalize buf into extradata and set its size appropriately.
Definition: utils.c:583
ff_unlock_avformat
int ff_unlock_avformat(void)
Definition: utils.c:53
ff_is_intra_only
int ff_is_intra_only(enum AVCodecID id)
Definition: avformat.c:827
CodecMime
Definition: internal.h:54
FFStream::is_intra_only
int is_intra_only
Definition: internal.h:242
ff_guess_image2_codec
enum AVCodecID ff_guess_image2_codec(const char *filename)
Definition: img2.c:115
FFStream::dts_ordered
uint8_t dts_ordered
Definition: internal.h:355
FFStream::last_IP_duration
int last_IP_duration
Definition: internal.h:378
ffstream
static av_always_inline FFStream * ffstream(AVStream *st)
Definition: internal.h:413
FFStream::inited
int inited
Definition: internal.h:234
AVStreamParseType
AVStreamParseType
Definition: avformat.h:796
FFStream::index_entries_allocated_size
unsigned int index_entries_allocated_size
Definition: internal.h:254
ff_get_line
int ff_get_line(AVIOContext *s, char *buf, int maxlen)
Read a whole line of text from AVIOContext.
Definition: aviobuf.c:800
FFStream::avctx
struct AVCodecContext * avctx
The codec context used by avformat_find_stream_info, the parser, etc.
Definition: internal.h:223
FFFormatContext::metafree
int metafree
Contexts and child contexts do not contain a metadata option.
Definition: internal.h:188
ff_data_to_hex
char * ff_data_to_hex(char *buf, const uint8_t *src, int size, int lowercase)
Write hexadecimal string corresponding to given binary data.
Definition: utils.c:454
FFStream::priv_pts
FFFrac * priv_pts
Definition: internal.h:244
ff_stream_side_data_copy
int ff_stream_side_data_copy(AVStream *dst, const AVStream *src)
Copy side data from source to destination stream.
Definition: avformat.c:208
AVInputFormat
Definition: avformat.h:656
AVCodecTag
Definition: internal.h:49
ff_framehash_write_header
int ff_framehash_write_header(AVFormatContext *s)
Set the timebase for each stream from the corresponding codec timebase and print it.
Definition: framehash.c:25
FFFormatContext::parse_queue
PacketList parse_queue
Packets split by the parser get queued here.
Definition: internal.h:120
s
#define s(width, name)
Definition: cbs_vp9.c:256
FFFormatContext::packet_buffer
PacketList packet_buffer
This buffer is only needed when packets were already buffered but not decoded, for example to get the...
Definition: internal.h:105
ff_rename
int ff_rename(const char *url_src, const char *url_dst, void *logctx)
Wrap ffurl_move() and log if error happens.
Definition: avio.c:671
FFStream::nb_decoded_frames
int nb_decoded_frames
Number of internally decoded frames, used internally in libavformat, do not access its lifetime diffe...
Definition: internal.h:305
FFFormatContext::data_offset
int64_t data_offset
offset of the first packet
Definition: internal.h:108
FFStream::codec_info_nb_frames
int codec_info_nb_frames
Number of frames that have been demuxed during avformat_find_stream_info()
Definition: internal.h:392
FFStream::pts_reorder_error_count
uint8_t pts_reorder_error_count[MAX_REORDER_DELAY+1]
Definition: internal.h:347
FFStream::display_aspect_ratio
AVRational display_aspect_ratio
display aspect ratio (0 if unknown)
Definition: internal.h:368
codec_id
enum AVCodecID codec_id
Definition: vaapi_decode.c:388
key
const char * key
Definition: hwcontext_opencl.c:174
FFFormatContext::AVOID_NEGATIVE_TS_KNOWN
@ AVOID_NEGATIVE_TS_KNOWN
Definition: internal.h:90
FFFormatContext::AVOID_NEGATIVE_TS_DISABLED
@ AVOID_NEGATIVE_TS_DISABLED
Definition: internal.h:88
FFStream::pts_reorder_error
int64_t pts_reorder_error[MAX_REORDER_DELAY+1]
Internal data to generate dts from pts.
Definition: internal.h:346
ff_hex_to_data
int ff_hex_to_data(uint8_t *data, const char *p)
Parse a string of hexadecimal strings.
Definition: utils.c:475
FFFormatContext
Definition: internal.h:71
FFStream::need_parsing
enum AVStreamParseType need_parsing
Definition: internal.h:386
context
it s the only field you need to keep assuming you have a context There is some magic you don t need to care about around this just let it vf default minimum maximum flags name is the option keep it simple and lowercase description are in without and describe what they for example set the foo of the bar offset is the offset of the field in your context
Definition: writing_filters.txt:91
AVFormatContext
Format I/O context.
Definition: avformat.h:1216
FFStream::pub
AVStream pub
The public context.
Definition: internal.h:200
FFStream::bitstream_checked
int bitstream_checked
Whether or not check_bitstream should still be run on each packet.
Definition: internal.h:218
FFStream::avctx_inited
int avctx_inited
1 if avctx has been initialized with the values from the codec parameters
Definition: internal.h:227
AVRational
Rational number (pair of numerator and denominator).
Definition: rational.h:58
FFStream::nb_index_entries
int nb_index_entries
Definition: internal.h:253
AVProbeData
This structure contains the data a format has to probe a file.
Definition: avformat.h:453
FFStream::interleaver_chunk_duration
int64_t interleaver_chunk_duration
Definition: internal.h:257
FFFormatContext::inject_global_side_data
int inject_global_side_data
Definition: internal.h:151
AVCodecID
AVCodecID
Identify the syntax and semantics of the bitstream.
Definition: codec_id.h:49
FFFormatContext::id3v2_meta
AVDictionary * id3v2_meta
ID3v2 tag useful for MP3 demuxing.
Definition: internal.h:173
AVIOContext
Bytestream IO Context.
Definition: avio.h:166
FFFormatContext::parse_pkt
AVPacket * parse_pkt
The generic code uses this as a temporary packet to parse packets or for muxing, especially flushing.
Definition: internal.h:134
ff_codec_get_id
enum AVCodecID ff_codec_get_id(const AVCodecTag *tags, unsigned int tag)
Definition: utils.c:144
FFStreamInfo
Definition: demux.h:30
FFFrac::val
int64_t val
Definition: internal.h:67
FFStream
Definition: internal.h:196
FFFormatContext::AVOID_NEGATIVE_TS_UNKNOWN
@ AVOID_NEGATIVE_TS_UNKNOWN
Definition: internal.h:89
FFStream::last_discard_sample
int64_t last_discard_sample
The sample after last sample that is intended to be discarded after first_discard_sample.
Definition: internal.h:299
FFStream::extract_extradata
struct FFStream::@281 extract_extradata
bps
unsigned bps
Definition: movenc.c:1648
ff_copy_whiteblacklists
int ff_copy_whiteblacklists(AVFormatContext *dst, const AVFormatContext *src)
Copies the whilelists from one context to the other.
Definition: avformat.c:807
ff_format_io_close_default
void ff_format_io_close_default(AVFormatContext *s, AVIOContext *pb)
Definition: options.c:154
size
int size
Definition: twinvq_data.h:10344
ff_lock_avformat
int ff_lock_avformat(void)
Definition: utils.c:48
FFStream::dts_misordered
uint8_t dts_misordered
Definition: internal.h:356
ff_is_http_proto
int ff_is_http_proto(const char *filename)
Utility function to check if the file uses http or https protocol.
Definition: utils.c:578
MAX_REORDER_DELAY
#define MAX_REORDER_DELAY
Definition: internal.h:341
FFStream::pts_wrap_behavior
int pts_wrap_behavior
Options for behavior, when a wrap is detected.
Definition: internal.h:334
FFFormatContext::raw_packet_buffer_size
int raw_packet_buffer_size
Sum of the size of packets in raw_packet_buffer, in bytes.
Definition: internal.h:145
FFStream::update_initial_durations_done
int update_initial_durations_done
Internal data to prevent doing update_initial_durations() twice.
Definition: internal.h:339
FFStream::start_skip_samples
int64_t start_skip_samples
If not 0, the number of samples that should be skipped from the start of the stream (the samples are ...
Definition: internal.h:284
FFStream::probe_packets
int probe_packets
Number of packets to buffer for codec probing.
Definition: internal.h:383
FFStream::probe_data
AVProbeData probe_data
Definition: internal.h:370
FFStream::skip_to_keyframe
int skip_to_keyframe
Indicates that everything up to the next keyframe should be discarded.
Definition: internal.h:270
FFFormatContext::raw_packet_buffer
PacketList raw_packet_buffer
Raw packets from the demuxer, prior to parsing and decoding.
Definition: internal.h:116
PacketListEntry
Definition: packet_internal.h:26
FFStream::mux_ts_offset
int64_t mux_ts_offset
Timestamp offset added to timestamps before muxing.
Definition: internal.h:310
AVOutputFormat
Definition: avformat.h:509
i
#define i(width, name, range_min, range_max)
Definition: cbs_h2645.c:269
ff_flush_packet_queue
void ff_flush_packet_queue(AVFormatContext *s)
Definition: avformat.c:85
FFStream::reorder
int reorder
Set to 1 if the codec allows reordering, so pts can be different from dts.
Definition: internal.h:206
ff_remove_stream
void ff_remove_stream(AVFormatContext *s, AVStream *st)
Remove a stream from its AVFormatContext and free it.
Definition: avformat.c:76
av_always_inline
#define av_always_inline
Definition: attributes.h:49
FFStream::pts_buffer
int64_t pts_buffer[MAX_REORDER_DELAY+1]
Definition: internal.h:349
ff_free_stream
void ff_free_stream(AVStream **st)
Frees a stream without modifying the corresponding AVFormatContext.
Definition: avformat.c:40
FFStream::last_in_packet_buffer
PacketListEntry * last_in_packet_buffer
last packet in packet_buffer for this stream when muxing.
Definition: internal.h:375
ff_sdp_write_media
int ff_sdp_write_media(char *buff, int size, const AVStream *st, int idx, const char *dest_addr, const char *dest_type, int port, int ttl, AVFormatContext *fmt)
Append the media-specific SDP fragment for the media stream c to the buffer buff.
Definition: sdp.c:916
AVCodecParserContext
Definition: avcodec.h:2800
tag
uint32_t tag
Definition: movenc.c:1647
AVStream
Stream structure.
Definition: avformat.h:948
lowercase
it s the only field you need to keep assuming you have a context There is some magic you don t need to care about around this just let it vf default minimum maximum flags name is the option keep it simple and lowercase description are in lowercase
Definition: writing_filters.txt:89
avformat.h
ff_format_set_url
void ff_format_set_url(AVFormatContext *s, char *url)
Set AVFormatContext url field to the provided pointer.
Definition: avformat.c:838
FFFormatContext::chapter_ids_monotonic
int chapter_ids_monotonic
Set if chapter ids are strictly monotonic.
Definition: internal.h:183
FFFormatContext::avoid_negative_ts_status
enum FFFormatContext::@280 avoid_negative_ts_status
Whether the timestamp shift offset has already been determined.
AVCodecContext
main external API structure.
Definition: avcodec.h:398
ff_codec_get_tag
unsigned int ff_codec_get_tag(const AVCodecTag *tags, enum AVCodecID id)
Definition: utils.c:134
ff_parse_key_val_cb
void(* ff_parse_key_val_cb)(void *context, const char *key, int key_len, char **dest, int *dest_len)
Callback function type for ff_parse_key_value.
Definition: internal.h:552
avpriv_set_pts_info
void avpriv_set_pts_info(AVStream *st, int pts_wrap_bits, unsigned int pts_num, unsigned int pts_den)
Set the time base and wrapping info for a given stream.
Definition: avformat.c:763
FFStream::info
struct FFStreamInfo * info
Stream information used internally by avformat_find_stream_info()
Definition: internal.h:249
CodecMime::str
char str[32]
Definition: internal.h:55
FFStream::index_entries
AVIndexEntry * index_entries
Only used if the format does not support seeking natively.
Definition: internal.h:251
CodecMime::id
enum AVCodecID id
Definition: internal.h:56
FFFormatContext::streams_initialized
int streams_initialized
Whether or not avformat_init_output fully initialized streams.
Definition: internal.h:168
flush
void(* flush)(AVBSFContext *ctx)
Definition: dts2pts_bsf.c:365
FFFrac::num
int64_t num
Definition: internal.h:67
packet_internal.h
FFFormatContext::pkt
AVPacket * pkt
Used to hold temporary packets for the generic demuxing code.
Definition: internal.h:141
ff_mkdir_p
int ff_mkdir_p(const char *path)
Automatically create sub-directories.
Definition: utils.c:420
FFStream::request_probe
int request_probe
stream probing state -1 -> probing finished 0 -> no probing requested rest -> perform probing with re...
Definition: internal.h:265
AVPacket
This structure stores compressed data.
Definition: packet.h:351
src
INIT_CLIP pixel * src
Definition: h264pred_template.c:418
FFStream::cur_dts
int64_t cur_dts
Definition: internal.h:410
convert_header.str
string str
Definition: convert_header.py:20
FFStream::stream_identifier
int stream_identifier
Stream Identifier This is the MPEG-TS stream identifier +1 0 means unknown.
Definition: internal.h:399
FFStream::need_context_update
int need_context_update
Whether the internal avctx needs to be updated from codecpar (after a late change to codecpar)
Definition: internal.h:240
FFStream::parser
struct AVCodecParserContext * parser
Definition: internal.h:387
FFFrac
The exact value of the fractional number is: 'val + num / den'.
Definition: internal.h:66
FFFrac::den
int64_t den
Definition: internal.h:67
AVCodecTag::tag
unsigned int tag
Definition: internal.h:51
int
int
Definition: ffmpeg_filter.c:156
FFFormatContext::pub
AVFormatContext pub
The public context.
Definition: internal.h:75
avpriv_register_devices
void avpriv_register_devices(const AVOutputFormat *const o[], const AVInputFormat *const i[])
Definition: allformats.c:595
FFStream::pts_wrap_reference
int64_t pts_wrap_reference
Internal data to check for wrapping of the time stamp.
Definition: internal.h:322
FFStream::lowest_ts_allowed
int64_t lowest_ts_allowed
This is the lowest ts allowed in this track; it may be set by the muxer during init or write_header a...
Definition: internal.h:317
ff_format_io_close
int ff_format_io_close(AVFormatContext *s, AVIOContext **pb)
Definition: avformat.c:845
FFFormatContext::nb_interleaved_streams
int nb_interleaved_streams
Number of streams relevant for interleaving.
Definition: internal.h:81
ff_parse_key_value
void ff_parse_key_value(const char *str, ff_parse_key_val_cb callback_get_buf, void *context)
Parse a string with comma-separated key=value pairs.
Definition: utils.c:503
ff_alloc_extradata
int ff_alloc_extradata(AVCodecParameters *par, int size)
Allocate extradata with additional AV_INPUT_BUFFER_PADDING_SIZE at end which is always set to 0.
Definition: utils.c:238
FFFormatContext::avoid_negative_ts_use_pts
int avoid_negative_ts_use_pts
Definition: internal.h:153