FFmpeg
 All Data Structures Namespaces Files Functions Variables Typedefs Enumerations Enumerator Macros Groups Pages
avformat.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 AVFORMAT_AVFORMAT_H
22 #define AVFORMAT_AVFORMAT_H
23 
24 /**
25  * @file
26  * @ingroup libavf
27  * Main libavformat public API header
28  */
29 
30 /**
31  * @defgroup libavf I/O and Muxing/Demuxing Library
32  * @{
33  *
34  * Libavformat (lavf) is a library for dealing with various media container
35  * formats. Its main two purposes are demuxing - i.e. splitting a media file
36  * into component streams, and the reverse process of muxing - writing supplied
37  * data in a specified container format. It also has an @ref lavf_io
38  * "I/O module" which supports a number of protocols for accessing the data (e.g.
39  * file, tcp, http and others). Before using lavf, you need to call
40  * av_register_all() to register all compiled muxers, demuxers and protocols.
41  * Unless you are absolutely sure you won't use libavformat's network
42  * capabilities, you should also call avformat_network_init().
43  *
44  * A supported input format is described by an AVInputFormat struct, conversely
45  * an output format is described by AVOutputFormat. You can iterate over all
46  * registered input/output formats using the av_iformat_next() /
47  * av_oformat_next() functions. The protocols layer is not part of the public
48  * API, so you can only get the names of supported protocols with the
49  * avio_enum_protocols() function.
50  *
51  * Main lavf structure used for both muxing and demuxing is AVFormatContext,
52  * which exports all information about the file being read or written. As with
53  * most Libavformat structures, its size is not part of public ABI, so it cannot be
54  * allocated on stack or directly with av_malloc(). To create an
55  * AVFormatContext, use avformat_alloc_context() (some functions, like
56  * avformat_open_input() might do that for you).
57  *
58  * Most importantly an AVFormatContext contains:
59  * @li the @ref AVFormatContext.iformat "input" or @ref AVFormatContext.oformat
60  * "output" format. It is either autodetected or set by user for input;
61  * always set by user for output.
62  * @li an @ref AVFormatContext.streams "array" of AVStreams, which describe all
63  * elementary streams stored in the file. AVStreams are typically referred to
64  * using their index in this array.
65  * @li an @ref AVFormatContext.pb "I/O context". It is either opened by lavf or
66  * set by user for input, always set by user for output (unless you are dealing
67  * with an AVFMT_NOFILE format).
68  *
69  * @section lavf_options Passing options to (de)muxers
70  * Lavf allows to configure muxers and demuxers using the @ref avoptions
71  * mechanism. Generic (format-independent) libavformat options are provided by
72  * AVFormatContext, they can be examined from a user program by calling
73  * av_opt_next() / av_opt_find() on an allocated AVFormatContext (or its AVClass
74  * from avformat_get_class()). Private (format-specific) options are provided by
75  * AVFormatContext.priv_data if and only if AVInputFormat.priv_class /
76  * AVOutputFormat.priv_class of the corresponding format struct is non-NULL.
77  * Further options may be provided by the @ref AVFormatContext.pb "I/O context",
78  * if its AVClass is non-NULL, and the protocols layer. See the discussion on
79  * nesting in @ref avoptions documentation to learn how to access those.
80  *
81  * @defgroup lavf_decoding Demuxing
82  * @{
83  * Demuxers read a media file and split it into chunks of data (@em packets). A
84  * @ref AVPacket "packet" contains one or more encoded frames which belongs to a
85  * single elementary stream. In the lavf API this process is represented by the
86  * avformat_open_input() function for opening a file, av_read_frame() for
87  * reading a single packet and finally avformat_close_input(), which does the
88  * cleanup.
89  *
90  * @section lavf_decoding_open Opening a media file
91  * The minimum information required to open a file is its URL or filename, which
92  * is passed to avformat_open_input(), as in the following code:
93  * @code
94  * const char *url = "in.mp3";
95  * AVFormatContext *s = NULL;
96  * int ret = avformat_open_input(&s, url, NULL, NULL);
97  * if (ret < 0)
98  * abort();
99  * @endcode
100  * The above code attempts to allocate an AVFormatContext, open the
101  * specified file (autodetecting the format) and read the header, exporting the
102  * information stored there into s. Some formats do not have a header or do not
103  * store enough information there, so it is recommended that you call the
104  * avformat_find_stream_info() function which tries to read and decode a few
105  * frames to find missing information.
106  *
107  * In some cases you might want to preallocate an AVFormatContext yourself with
108  * avformat_alloc_context() and do some tweaking on it before passing it to
109  * avformat_open_input(). One such case is when you want to use custom functions
110  * for reading input data instead of lavf internal I/O layer.
111  * To do that, create your own AVIOContext with avio_alloc_context(), passing
112  * your reading callbacks to it. Then set the @em pb field of your
113  * AVFormatContext to newly created AVIOContext.
114  *
115  * Since the format of the opened file is in general not known until after
116  * avformat_open_input() has returned, it is not possible to set demuxer private
117  * options on a preallocated context. Instead, the options should be passed to
118  * avformat_open_input() wrapped in an AVDictionary:
119  * @code
120  * AVDictionary *options = NULL;
121  * av_dict_set(&options, "video_size", "640x480", 0);
122  * av_dict_set(&options, "pixel_format", "rgb24", 0);
123  *
124  * if (avformat_open_input(&s, url, NULL, &options) < 0)
125  * abort();
126  * av_dict_free(&options);
127  * @endcode
128  * This code passes the private options 'video_size' and 'pixel_format' to the
129  * demuxer. They would be necessary for e.g. the rawvideo demuxer, since it
130  * cannot know how to interpret raw video data otherwise. If the format turns
131  * out to be something different than raw video, those options will not be
132  * recognized by the demuxer and therefore will not be applied. Such unrecognized
133  * options are then returned in the options dictionary (recognized options are
134  * consumed). The calling program can handle such unrecognized options as it
135  * wishes, e.g.
136  * @code
137  * AVDictionaryEntry *e;
138  * if (e = av_dict_get(options, "", NULL, AV_DICT_IGNORE_SUFFIX)) {
139  * fprintf(stderr, "Option %s not recognized by the demuxer.\n", e->key);
140  * abort();
141  * }
142  * @endcode
143  *
144  * After you have finished reading the file, you must close it with
145  * avformat_close_input(). It will free everything associated with the file.
146  *
147  * @section lavf_decoding_read Reading from an opened file
148  * Reading data from an opened AVFormatContext is done by repeatedly calling
149  * av_read_frame() on it. Each call, if successful, will return an AVPacket
150  * containing encoded data for one AVStream, identified by
151  * AVPacket.stream_index. This packet may be passed straight into the libavcodec
152  * decoding functions avcodec_decode_video2(), avcodec_decode_audio4() or
153  * avcodec_decode_subtitle2() if the caller wishes to decode the data.
154  *
155  * AVPacket.pts, AVPacket.dts and AVPacket.duration timing information will be
156  * set if known. They may also be unset (i.e. AV_NOPTS_VALUE for
157  * pts/dts, 0 for duration) if the stream does not provide them. The timing
158  * information will be in AVStream.time_base units, i.e. it has to be
159  * multiplied by the timebase to convert them to seconds.
160  *
161  * If AVPacket.buf is set on the returned packet, then the packet is
162  * allocated dynamically and the user may keep it indefinitely.
163  * Otherwise, if AVPacket.buf is NULL, the packet data is backed by a
164  * static storage somewhere inside the demuxer and the packet is only valid
165  * until the next av_read_frame() call or closing the file. If the caller
166  * requires a longer lifetime, av_dup_packet() will make an av_malloc()ed copy
167  * of it.
168  * In both cases, the packet must be freed with av_free_packet() when it is no
169  * longer needed.
170  *
171  * @section lavf_decoding_seek Seeking
172  * @}
173  *
174  * @defgroup lavf_encoding Muxing
175  * @{
176  * Muxers take encoded data in the form of @ref AVPacket "AVPackets" and write
177  * it into files or other output bytestreams in the specified container format.
178  *
179  * The main API functions for muxing are avformat_write_header() for writing the
180  * file header, av_write_frame() / av_interleaved_write_frame() for writing the
181  * packets and av_write_trailer() for finalizing the file.
182  *
183  * At the beginning of the muxing process, the caller must first call
184  * avformat_alloc_context() to create a muxing context. The caller then sets up
185  * the muxer by filling the various fields in this context:
186  *
187  * - The @ref AVFormatContext.oformat "oformat" field must be set to select the
188  * muxer that will be used.
189  * - Unless the format is of the AVFMT_NOFILE type, the @ref AVFormatContext.pb
190  * "pb" field must be set to an opened IO context, either returned from
191  * avio_open2() or a custom one.
192  * - Unless the format is of the AVFMT_NOSTREAMS type, at least one stream must
193  * be created with the avformat_new_stream() function. The caller should fill
194  * the @ref AVStream.codec "stream codec context" information, such as the
195  * codec @ref AVCodecContext.codec_type "type", @ref AVCodecContext.codec_id
196  * "id" and other parameters (e.g. width / height, the pixel or sample format,
197  * etc.) as known. The @ref AVStream.time_base "stream timebase" should
198  * be set to the timebase that the caller desires to use for this stream (note
199  * that the timebase actually used by the muxer can be different, as will be
200  * described later).
201  * - It is advised to manually initialize only the relevant fields in
202  * AVCodecContext, rather than using @ref avcodec_copy_context() during
203  * remuxing: there is no guarantee that the codec context values remain valid
204  * for both input and output format contexts.
205  * - The caller may fill in additional information, such as @ref
206  * AVFormatContext.metadata "global" or @ref AVStream.metadata "per-stream"
207  * metadata, @ref AVFormatContext.chapters "chapters", @ref
208  * AVFormatContext.programs "programs", etc. as described in the
209  * AVFormatContext documentation. Whether such information will actually be
210  * stored in the output depends on what the container format and the muxer
211  * support.
212  *
213  * When the muxing context is fully set up, the caller must call
214  * avformat_write_header() to initialize the muxer internals and write the file
215  * header. Whether anything actually is written to the IO context at this step
216  * depends on the muxer, but this function must always be called. Any muxer
217  * private options must be passed in the options parameter to this function.
218  *
219  * The data is then sent to the muxer by repeatedly calling av_write_frame() or
220  * av_interleaved_write_frame() (consult those functions' documentation for
221  * discussion on the difference between them; only one of them may be used with
222  * a single muxing context, they should not be mixed). Do note that the timing
223  * information on the packets sent to the muxer must be in the corresponding
224  * AVStream's timebase. That timebase is set by the muxer (in the
225  * avformat_write_header() step) and may be different from the timebase
226  * requested by the caller.
227  *
228  * Once all the data has been written, the caller must call av_write_trailer()
229  * to flush any buffered packets and finalize the output file, then close the IO
230  * context (if any) and finally free the muxing context with
231  * avformat_free_context().
232  * @}
233  *
234  * @defgroup lavf_io I/O Read/Write
235  * @{
236  * @section lavf_io_dirlist Directory listing
237  * The directory listing API allows to list files on remote servers.
238  *
239  * Some of possible use cases:
240  * - an "open file" dialog to choose files from a remote location,
241  * - a recursive media finder providing a player with an ability to play all
242  * files from a given directory.
243  *
244  * @subsection lavf_io_dirlist_open Opening a directory
245  * At first, a directory needs to be opened by calling avio_open_dir()
246  * supplied with a URL and, optionally, ::AVDictionary containing
247  * protocol-specific parameters. The function returns zero or positive
248  * integer and allocates AVIODirContext on success.
249  *
250  * @code
251  * AVIODirContext *ctx = NULL;
252  * if (avio_open_dir(&ctx, "smb://example.com/some_dir", NULL) < 0) {
253  * fprintf(stderr, "Cannot open directory.\n");
254  * abort();
255  * }
256  * @endcode
257  *
258  * This code tries to open a sample directory using smb protocol without
259  * any additional parameters.
260  *
261  * @subsection lavf_io_dirlist_read Reading entries
262  * Each directory's entry (i.e. file, another directory, anything else
263  * within ::AVIODirEntryType) is represented by AVIODirEntry.
264  * Reading consecutive entries from an opened AVIODirContext is done by
265  * repeatedly calling avio_read_dir() on it. Each call returns zero or
266  * positive integer if successful. Reading can be stopped right after the
267  * NULL entry has been read -- it means there are no entries left to be
268  * read. The following code reads all entries from a directory associated
269  * with ctx and prints their names to standard output.
270  * @code
271  * AVIODirEntry *entry = NULL;
272  * for (;;) {
273  * if (avio_read_dir(ctx, &entry) < 0) {
274  * fprintf(stderr, "Cannot list directory.\n");
275  * abort();
276  * }
277  * if (!entry)
278  * break;
279  * printf("%s\n", entry->name);
280  * avio_free_directory_entry(&entry);
281  * }
282  * @endcode
283  * @}
284  *
285  * @defgroup lavf_codec Demuxers
286  * @{
287  * @defgroup lavf_codec_native Native Demuxers
288  * @{
289  * @}
290  * @defgroup lavf_codec_wrappers External library wrappers
291  * @{
292  * @}
293  * @}
294  * @defgroup lavf_protos I/O Protocols
295  * @{
296  * @}
297  * @defgroup lavf_internal Internal
298  * @{
299  * @}
300  * @}
301  *
302  */
303 
304 #include <time.h>
305 #include <stdio.h> /* FILE */
306 #include "libavcodec/avcodec.h"
307 #include "libavutil/dict.h"
308 #include "libavutil/log.h"
309 
310 #include "avio.h"
311 #include "libavformat/version.h"
312 
313 struct AVFormatContext;
314 
315 struct AVDeviceInfoList;
317 
318 /**
319  * @defgroup metadata_api Public Metadata API
320  * @{
321  * @ingroup libavf
322  * The metadata API allows libavformat to export metadata tags to a client
323  * application when demuxing. Conversely it allows a client application to
324  * set metadata when muxing.
325  *
326  * Metadata is exported or set as pairs of key/value strings in the 'metadata'
327  * fields of the AVFormatContext, AVStream, AVChapter and AVProgram structs
328  * using the @ref lavu_dict "AVDictionary" API. Like all strings in FFmpeg,
329  * metadata is assumed to be UTF-8 encoded Unicode. Note that metadata
330  * exported by demuxers isn't checked to be valid UTF-8 in most cases.
331  *
332  * Important concepts to keep in mind:
333  * - Keys are unique; there can never be 2 tags with the same key. This is
334  * also meant semantically, i.e., a demuxer should not knowingly produce
335  * several keys that are literally different but semantically identical.
336  * E.g., key=Author5, key=Author6. In this example, all authors must be
337  * placed in the same tag.
338  * - Metadata is flat, not hierarchical; there are no subtags. If you
339  * want to store, e.g., the email address of the child of producer Alice
340  * and actor Bob, that could have key=alice_and_bobs_childs_email_address.
341  * - Several modifiers can be applied to the tag name. This is done by
342  * appending a dash character ('-') and the modifier name in the order
343  * they appear in the list below -- e.g. foo-eng-sort, not foo-sort-eng.
344  * - language -- a tag whose value is localized for a particular language
345  * is appended with the ISO 639-2/B 3-letter language code.
346  * For example: Author-ger=Michael, Author-eng=Mike
347  * The original/default language is in the unqualified "Author" tag.
348  * A demuxer should set a default if it sets any translated tag.
349  * - sorting -- a modified version of a tag that should be used for
350  * sorting will have '-sort' appended. E.g. artist="The Beatles",
351  * artist-sort="Beatles, The".
352  * - Some protocols and demuxers support metadata updates. After a successful
353  * call to av_read_packet(), AVFormatContext.event_flags or AVStream.event_flags
354  * will be updated to indicate if metadata changed. In order to detect metadata
355  * changes on a stream, you need to loop through all streams in the AVFormatContext
356  * and check their individual event_flags.
357  *
358  * - Demuxers attempt to export metadata in a generic format, however tags
359  * with no generic equivalents are left as they are stored in the container.
360  * Follows a list of generic tag names:
361  *
362  @verbatim
363  album -- name of the set this work belongs to
364  album_artist -- main creator of the set/album, if different from artist.
365  e.g. "Various Artists" for compilation albums.
366  artist -- main creator of the work
367  comment -- any additional description of the file.
368  composer -- who composed the work, if different from artist.
369  copyright -- name of copyright holder.
370  creation_time-- date when the file was created, preferably in ISO 8601.
371  date -- date when the work was created, preferably in ISO 8601.
372  disc -- number of a subset, e.g. disc in a multi-disc collection.
373  encoder -- name/settings of the software/hardware that produced the file.
374  encoded_by -- person/group who created the file.
375  filename -- original name of the file.
376  genre -- <self-evident>.
377  language -- main language in which the work is performed, preferably
378  in ISO 639-2 format. Multiple languages can be specified by
379  separating them with commas.
380  performer -- artist who performed the work, if different from artist.
381  E.g for "Also sprach Zarathustra", artist would be "Richard
382  Strauss" and performer "London Philharmonic Orchestra".
383  publisher -- name of the label/publisher.
384  service_name -- name of the service in broadcasting (channel name).
385  service_provider -- name of the service provider in broadcasting.
386  title -- name of the work.
387  track -- number of this work in the set, can be in form current/total.
388  variant_bitrate -- the total bitrate of the bitrate variant that the current stream is part of
389  @endverbatim
390  *
391  * Look in the examples section for an application example how to use the Metadata API.
392  *
393  * @}
394  */
395 
396 /* packet functions */
397 
398 
399 /**
400  * Allocate and read the payload of a packet and initialize its
401  * fields with default values.
402  *
403  * @param s associated IO context
404  * @param pkt packet
405  * @param size desired payload size
406  * @return >0 (read size) if OK, AVERROR_xxx otherwise
407  */
409 
410 
411 /**
412  * Read data and append it to the current content of the AVPacket.
413  * If pkt->size is 0 this is identical to av_get_packet.
414  * Note that this uses av_grow_packet and thus involves a realloc
415  * which is inefficient. Thus this function should only be used
416  * when there is no reasonable way to know (an upper bound of)
417  * the final size.
418  *
419  * @param s associated IO context
420  * @param pkt packet
421  * @param size amount of data to read
422  * @return >0 (read size) if OK, AVERROR_xxx otherwise, previous data
423  * will not be lost even if an error occurs.
424  */
426 
427 #if FF_API_LAVF_FRAC
428 /*************************************************/
429 /* fractional numbers for exact pts handling */
430 
431 /**
432  * The exact value of the fractional number is: 'val + num / den'.
433  * num is assumed to be 0 <= num < den.
434  */
435 typedef struct AVFrac {
436  int64_t val, num, den;
437 } AVFrac;
438 #endif
439 
440 /*************************************************/
441 /* input/output formats */
442 
443 struct AVCodecTag;
444 
445 /**
446  * This structure contains the data a format has to probe a file.
447  */
448 typedef struct AVProbeData {
449  const char *filename;
450  unsigned char *buf; /**< Buffer must have AVPROBE_PADDING_SIZE of extra allocated bytes filled with zero. */
451  int buf_size; /**< Size of buf except extra allocated bytes */
452  const char *mime_type; /**< mime_type, when known. */
453 } AVProbeData;
454 
455 #define AVPROBE_SCORE_RETRY (AVPROBE_SCORE_MAX/4)
456 #define AVPROBE_SCORE_STREAM_RETRY (AVPROBE_SCORE_MAX/4-1)
457 
458 #define AVPROBE_SCORE_EXTENSION 50 ///< score for file extension
459 #define AVPROBE_SCORE_MIME 75 ///< score for file mime type
460 #define AVPROBE_SCORE_MAX 100 ///< maximum score
461 
462 #define AVPROBE_PADDING_SIZE 32 ///< extra allocated bytes at the end of the probe buffer
463 
464 /// Demuxer will use avio_open, no opened file should be provided by the caller.
465 #define AVFMT_NOFILE 0x0001
466 #define AVFMT_NEEDNUMBER 0x0002 /**< Needs '%d' in filename. */
467 #define AVFMT_SHOW_IDS 0x0008 /**< Show format stream IDs numbers. */
468 #define AVFMT_RAWPICTURE 0x0020 /**< Format wants AVPicture structure for
469  raw picture data. */
470 #define AVFMT_GLOBALHEADER 0x0040 /**< Format wants global header. */
471 #define AVFMT_NOTIMESTAMPS 0x0080 /**< Format does not need / have any timestamps. */
472 #define AVFMT_GENERIC_INDEX 0x0100 /**< Use generic index building code. */
473 #define AVFMT_TS_DISCONT 0x0200 /**< Format allows timestamp discontinuities. Note, muxers always require valid (monotone) timestamps */
474 #define AVFMT_VARIABLE_FPS 0x0400 /**< Format allows variable fps. */
475 #define AVFMT_NODIMENSIONS 0x0800 /**< Format does not need width/height */
476 #define AVFMT_NOSTREAMS 0x1000 /**< Format does not require any streams */
477 #define AVFMT_NOBINSEARCH 0x2000 /**< Format does not allow to fall back on binary search via read_timestamp */
478 #define AVFMT_NOGENSEARCH 0x4000 /**< Format does not allow to fall back on generic search */
479 #define AVFMT_NO_BYTE_SEEK 0x8000 /**< Format does not allow seeking by bytes */
480 #define AVFMT_ALLOW_FLUSH 0x10000 /**< Format allows flushing. If not set, the muxer will not receive a NULL packet in the write_packet function. */
481 #if LIBAVFORMAT_VERSION_MAJOR <= 54
482 #define AVFMT_TS_NONSTRICT 0x8020000 //we try to be compatible to the ABIs of ffmpeg and major forks
483 #else
484 #define AVFMT_TS_NONSTRICT 0x20000
485 #endif
486  /**< Format does not require strictly
487  increasing timestamps, but they must
488  still be monotonic */
489 #define AVFMT_TS_NEGATIVE 0x40000 /**< Format allows muxing negative
490  timestamps. If not set the timestamp
491  will be shifted in av_write_frame and
492  av_interleaved_write_frame so they
493  start from 0.
494  The user or muxer can override this through
495  AVFormatContext.avoid_negative_ts
496  */
497 
498 #define AVFMT_SEEK_TO_PTS 0x4000000 /**< Seeking is based on PTS */
499 
500 /**
501  * @addtogroup lavf_encoding
502  * @{
503  */
504 typedef struct AVOutputFormat {
505  const char *name;
506  /**
507  * Descriptive name for the format, meant to be more human-readable
508  * than name. You should use the NULL_IF_CONFIG_SMALL() macro
509  * to define it.
510  */
511  const char *long_name;
512  const char *mime_type;
513  const char *extensions; /**< comma-separated filename extensions */
514  /* output support */
515  enum AVCodecID audio_codec; /**< default audio codec */
516  enum AVCodecID video_codec; /**< default video codec */
517  enum AVCodecID subtitle_codec; /**< default subtitle codec */
518  /**
519  * can use flags: AVFMT_NOFILE, AVFMT_NEEDNUMBER, AVFMT_RAWPICTURE,
520  * AVFMT_GLOBALHEADER, AVFMT_NOTIMESTAMPS, AVFMT_VARIABLE_FPS,
521  * AVFMT_NODIMENSIONS, AVFMT_NOSTREAMS, AVFMT_ALLOW_FLUSH,
522  * AVFMT_TS_NONSTRICT
523  */
524  int flags;
526  /**
527  * List of supported codec_id-codec_tag pairs, ordered by "better
528  * choice first". The arrays are all terminated by AV_CODEC_ID_NONE.
529  */
530  const struct AVCodecTag * const *codec_tag;
531 
533  const AVClass *priv_class; ///< AVClass for the private context
534 
535  /*****************************************************************
536  * No fields below this line are part of the public API. They
537  * may not be used outside of libavformat and can be changed and
538  * removed at will.
539  * New public fields should be added right above.
540  *****************************************************************
541  */
542  struct AVOutputFormat *next;
543  /**
544  * size of private data so that it can be allocated in the wrapper
545  */
546  int priv_data_size;
547 
548  int (*write_header)(struct AVFormatContext *);
549  /**
550  * Write a packet. If AVFMT_ALLOW_FLUSH is set in flags,
551  * pkt can be NULL in order to flush data buffered in the muxer.
552  * When flushing, return 0 if there still is more data to flush,
553  * or 1 if everything was flushed and there is no more buffered
554  * data.
555  */
557  int (*write_trailer)(struct AVFormatContext *);
558  /**
559  * Currently only used to set pixel format if not YUV420P.
560  */
561  int (*interleave_packet)(struct AVFormatContext *, AVPacket *out,
562  AVPacket *in, int flush);
563  /**
564  * Test if the given codec can be stored in this container.
565  *
566  * @return 1 if the codec is supported, 0 if it is not.
567  * A negative number if unknown.
568  * MKTAG('A', 'P', 'I', 'C') if the codec is only supported as AV_DISPOSITION_ATTACHED_PIC
569  */
570  int (*query_codec)(enum AVCodecID id, int std_compliance);
571 
572  void (*get_output_timestamp)(struct AVFormatContext *s, int stream,
573  int64_t *dts, int64_t *wall);
574  /**
575  * Allows sending messages from application to device.
576  */
577  int (*control_message)(struct AVFormatContext *s, int type,
578  void *data, size_t data_size);
579 
580  /**
581  * Write an uncoded AVFrame.
582  *
583  * See av_write_uncoded_frame() for details.
584  *
585  * The library will free *frame afterwards, but the muxer can prevent it
586  * by setting the pointer to NULL.
587  */
588  int (*write_uncoded_frame)(struct AVFormatContext *, int stream_index,
589  AVFrame **frame, unsigned flags);
590  /**
591  * Returns device list with it properties.
592  * @see avdevice_list_devices() for more details.
593  */
594  int (*get_device_list)(struct AVFormatContext *s, struct AVDeviceInfoList *device_list);
595  /**
596  * Initialize device capabilities submodule.
597  * @see avdevice_capabilities_create() for more details.
598  */
600  /**
601  * Free device capabilities submodule.
602  * @see avdevice_capabilities_free() for more details.
603  */
605  enum AVCodecID data_codec; /**< default data codec */
607 /**
608  * @}
609  */
610 
611 /**
612  * @addtogroup lavf_decoding
613  * @{
614  */
615 typedef struct AVInputFormat {
616  /**
617  * A comma separated list of short names for the format. New names
618  * may be appended with a minor bump.
619  */
620  const char *name;
621 
622  /**
623  * Descriptive name for the format, meant to be more human-readable
624  * than name. You should use the NULL_IF_CONFIG_SMALL() macro
625  * to define it.
626  */
627  const char *long_name;
629  /**
630  * Can use flags: AVFMT_NOFILE, AVFMT_NEEDNUMBER, AVFMT_SHOW_IDS,
631  * AVFMT_GENERIC_INDEX, AVFMT_TS_DISCONT, AVFMT_NOBINSEARCH,
632  * AVFMT_NOGENSEARCH, AVFMT_NO_BYTE_SEEK, AVFMT_SEEK_TO_PTS.
633  */
634  int flags;
636  /**
637  * If extensions are defined, then no probe is done. You should
638  * usually not use extension format guessing because it is not
639  * reliable enough
640  */
641  const char *extensions;
643  const struct AVCodecTag * const *codec_tag;
644 
645  const AVClass *priv_class; ///< AVClass for the private context
646 
647  /**
648  * Comma-separated list of mime types.
649  * It is used check for matching mime types while probing.
650  * @see av_probe_input_format2
651  */
652  const char *mime_type;
654  /*****************************************************************
655  * No fields below this line are part of the public API. They
656  * may not be used outside of libavformat and can be changed and
657  * removed at will.
658  * New public fields should be added right above.
659  *****************************************************************
660  */
661  struct AVInputFormat *next;
662 
663  /**
664  * Raw demuxers store their codec ID here.
665  */
666  int raw_codec_id;
667 
668  /**
669  * Size of private data so that it can be allocated in the wrapper.
670  */
671  int priv_data_size;
672 
673  /**
674  * Tell if a given file has a chance of being parsed as this format.
675  * The buffer provided is guaranteed to be AVPROBE_PADDING_SIZE bytes
676  * big so you do not have to check for that unless you need more.
677  */
678  int (*read_probe)(AVProbeData *);
680  /**
681  * Read the format header and initialize the AVFormatContext
682  * structure. Return 0 if OK. 'avformat_new_stream' should be
683  * called to create new streams.
684  */
685  int (*read_header)(struct AVFormatContext *);
687  /**
688  * Read one packet and put it in 'pkt'. pts and flags are also
689  * set. 'avformat_new_stream' can be called only if the flag
690  * AVFMTCTX_NOHEADER is used and only in the calling thread (not in a
691  * background thread).
692  * @return 0 on success, < 0 on error.
693  * When returning an error, pkt must not have been allocated
694  * or must be freed before returning
695  */
696  int (*read_packet)(struct AVFormatContext *, AVPacket *pkt);
697 
698  /**
699  * Close the stream. The AVFormatContext and AVStreams are not
700  * freed by this function
701  */
702  int (*read_close)(struct AVFormatContext *);
703 
704  /**
705  * Seek to a given timestamp relative to the frames in
706  * stream component stream_index.
707  * @param stream_index Must not be -1.
708  * @param flags Selects which direction should be preferred if no exact
709  * match is available.
710  * @return >= 0 on success (but not necessarily the new offset)
711  */
712  int (*read_seek)(struct AVFormatContext *,
713  int stream_index, int64_t timestamp, int flags);
714 
715  /**
716  * Get the next timestamp in stream[stream_index].time_base units.
717  * @return the timestamp or AV_NOPTS_VALUE if an error occurred
718  */
719  int64_t (*read_timestamp)(struct AVFormatContext *s, int stream_index,
720  int64_t *pos, int64_t pos_limit);
721 
722  /**
723  * Start/resume playing - only meaningful if using a network-based format
724  * (RTSP).
725  */
726  int (*read_play)(struct AVFormatContext *);
728  /**
729  * Pause playing - only meaningful if using a network-based format
730  * (RTSP).
731  */
732  int (*read_pause)(struct AVFormatContext *);
733 
734  /**
735  * Seek to timestamp ts.
736  * Seeking will be done so that the point from which all active streams
737  * can be presented successfully will be closest to ts and within min/max_ts.
738  * Active streams are all streams that have AVStream.discard < AVDISCARD_ALL.
739  */
740  int (*read_seek2)(struct AVFormatContext *s, int stream_index, int64_t min_ts, int64_t ts, int64_t max_ts, int flags);
741 
742  /**
743  * Returns device list with it properties.
744  * @see avdevice_list_devices() for more details.
745  */
746  int (*get_device_list)(struct AVFormatContext *s, struct AVDeviceInfoList *device_list);
747 
748  /**
749  * Initialize device capabilities submodule.
750  * @see avdevice_capabilities_create() for more details.
751  */
753 
754  /**
755  * Free device capabilities submodule.
756  * @see avdevice_capabilities_free() for more details.
757  */
759 } AVInputFormat;
760 /**
761  * @}
762  */
763 
764 enum AVStreamParseType {
766  AVSTREAM_PARSE_FULL, /**< full parsing and repack */
767  AVSTREAM_PARSE_HEADERS, /**< Only parse headers, do not repack. */
768  AVSTREAM_PARSE_TIMESTAMPS, /**< full parsing and interpolation of timestamps for frames not starting on a packet boundary */
769  AVSTREAM_PARSE_FULL_ONCE, /**< full parsing and repack of the first frame only, only implemented for H.264 currently */
770  AVSTREAM_PARSE_FULL_RAW=MKTAG(0,'R','A','W'), /**< full parsing and repack with timestamp and position generation by parser for raw
771  this assumes that each packet in the file contains no demuxer level headers and
772  just codec level data, otherwise position generation would fail */
773 };
775 typedef struct AVIndexEntry {
776  int64_t pos;
777  int64_t timestamp; /**<
778  * Timestamp in AVStream.time_base units, preferably the time from which on correctly decoded frames are available
779  * when seeking to this entry. That means preferable PTS on keyframe based formats.
780  * But demuxers can choose to store a different timestamp, if it is more convenient for the implementation or nothing better
781  * is known
782  */
783 #define AVINDEX_KEYFRAME 0x0001
784  int flags:2;
785  int size:30; //Yeah, trying to keep the size of this small to reduce memory requirements (it is 24 vs. 32 bytes due to possible 8-byte alignment).
786  int min_distance; /**< Minimum distance between this and the previous keyframe, used to avoid unneeded searching. */
787 } AVIndexEntry;
788 
789 #define AV_DISPOSITION_DEFAULT 0x0001
790 #define AV_DISPOSITION_DUB 0x0002
791 #define AV_DISPOSITION_ORIGINAL 0x0004
792 #define AV_DISPOSITION_COMMENT 0x0008
793 #define AV_DISPOSITION_LYRICS 0x0010
794 #define AV_DISPOSITION_KARAOKE 0x0020
795 
796 /**
797  * Track should be used during playback by default.
798  * Useful for subtitle track that should be displayed
799  * even when user did not explicitly ask for subtitles.
800  */
801 #define AV_DISPOSITION_FORCED 0x0040
802 #define AV_DISPOSITION_HEARING_IMPAIRED 0x0080 /**< stream for hearing impaired audiences */
803 #define AV_DISPOSITION_VISUAL_IMPAIRED 0x0100 /**< stream for visual impaired audiences */
804 #define AV_DISPOSITION_CLEAN_EFFECTS 0x0200 /**< stream without voice */
805 /**
806  * The stream is stored in the file as an attached picture/"cover art" (e.g.
807  * APIC frame in ID3v2). The single packet associated with it will be returned
808  * among the first few packets read from the file unless seeking takes place.
809  * It can also be accessed at any time in AVStream.attached_pic.
810  */
811 #define AV_DISPOSITION_ATTACHED_PIC 0x0400
813 /**
814  * To specify text track kind (different from subtitles default).
815  */
816 #define AV_DISPOSITION_CAPTIONS 0x10000
817 #define AV_DISPOSITION_DESCRIPTIONS 0x20000
818 #define AV_DISPOSITION_METADATA 0x40000
820 /**
821  * Options for behavior on timestamp wrap detection.
822  */
823 #define AV_PTS_WRAP_IGNORE 0 ///< ignore the wrap
824 #define AV_PTS_WRAP_ADD_OFFSET 1 ///< add the format specific offset on wrap detection
825 #define AV_PTS_WRAP_SUB_OFFSET -1 ///< subtract the format specific offset on wrap detection
827 /**
828  * Stream structure.
829  * New fields can be added to the end with minor version bumps.
830  * Removal, reordering and changes to existing fields require a major
831  * version bump.
832  * sizeof(AVStream) must not be used outside libav*.
833  */
834 typedef struct AVStream {
835  int index; /**< stream index in AVFormatContext */
836  /**
837  * Format-specific stream ID.
838  * decoding: set by libavformat
839  * encoding: set by the user, replaced by libavformat if left unset
840  */
841  int id;
842  /**
843  * Codec context associated with this stream. Allocated and freed by
844  * libavformat.
845  *
846  * - decoding: The demuxer exports codec information stored in the headers
847  * here.
848  * - encoding: The user sets codec information, the muxer writes it to the
849  * output. Mandatory fields as specified in AVCodecContext
850  * documentation must be set even if this AVCodecContext is
851  * not actually used for encoding.
852  */
854  void *priv_data;
855 
856 #if FF_API_LAVF_FRAC
857  /**
858  * @deprecated this field is unused
859  */
861  struct AVFrac pts;
862 #endif
863 
864  /**
865  * This is the fundamental unit of time (in seconds) in terms
866  * of which frame timestamps are represented.
867  *
868  * decoding: set by libavformat
869  * encoding: May be set by the caller before avformat_write_header() to
870  * provide a hint to the muxer about the desired timebase. In
871  * avformat_write_header(), the muxer will overwrite this field
872  * with the timebase that will actually be used for the timestamps
873  * written into the file (which may or may not be related to the
874  * user-provided one, depending on the format).
875  */
877 
878  /**
879  * Decoding: pts of the first frame of the stream in presentation order, in stream time base.
880  * Only set this if you are absolutely 100% sure that the value you set
881  * it to really is the pts of the first frame.
882  * This may be undefined (AV_NOPTS_VALUE).
883  * @note The ASF header does NOT contain a correct start_time the ASF
884  * demuxer must NOT set this.
885  */
886  int64_t start_time;
887 
888  /**
889  * Decoding: duration of the stream, in stream time base.
890  * If a source file does not specify a duration, but does specify
891  * a bitrate, this value will be estimated from bitrate and file size.
892  */
893  int64_t duration;
895  int64_t nb_frames; ///< number of frames in this stream if known or 0
896 
897  int disposition; /**< AV_DISPOSITION_* bit field */
898 
899  enum AVDiscard discard; ///< Selects which packets can be discarded at will and do not need to be demuxed.
900 
901  /**
902  * sample aspect ratio (0 if unknown)
903  * - encoding: Set by user.
904  * - decoding: Set by libavformat.
905  */
909 
910  /**
911  * Average framerate
912  *
913  * - demuxing: May be set by libavformat when creating the stream or in
914  * avformat_find_stream_info().
915  * - muxing: May be set by the caller before avformat_write_header().
916  */
918 
919  /**
920  * For streams with AV_DISPOSITION_ATTACHED_PIC disposition, this packet
921  * will contain the attached picture.
922  *
923  * decoding: set by libavformat, must not be modified by the caller.
924  * encoding: unused
925  */
927 
928  /**
929  * An array of side data that applies to the whole stream (i.e. the
930  * container does not allow it to change between packets).
931  *
932  * There may be no overlap between the side data in this array and side data
933  * in the packets. I.e. a given side data is either exported by the muxer
934  * (demuxing) / set by the caller (muxing) in this array, then it never
935  * appears in the packets, or the side data is exported / sent through
936  * the packets (always in the first packet where the value becomes known or
937  * changes), then it does not appear in this array.
938  *
939  * - demuxing: Set by libavformat when the stream is created.
940  * - muxing: May be set by the caller before avformat_write_header().
941  *
942  * Freed by libavformat in avformat_free_context().
943  *
944  * @see av_format_inject_global_side_data()
945  */
947  /**
948  * The number of elements in the AVStream.side_data array.
949  */
950  int nb_side_data;
951 
952  /**
953  * Flags for the user to detect events happening on the stream. Flags must
954  * be cleared by the user once the event has been handled.
955  * A combination of AVSTREAM_EVENT_FLAG_*.
956  */
957  int event_flags;
958 #define AVSTREAM_EVENT_FLAG_METADATA_UPDATED 0x0001 ///< The call resulted in updated metadata.
959 
960  /*****************************************************************
961  * All fields below this line are not part of the public API. They
962  * may not be used outside of libavformat and can be changed and
963  * removed at will.
964  * New public fields should be added right above.
965  *****************************************************************
966  */
967 
968  /**
969  * Stream information used internally by av_find_stream_info()
970  */
971 #define MAX_STD_TIMEBASES (30*12+7+6)
972  struct {
973  int64_t last_dts;
974  int64_t duration_gcd;
975  int duration_count;
976  int64_t rfps_duration_sum;
977  double (*duration_error)[2][MAX_STD_TIMEBASES];
978  int64_t codec_info_duration;
980 
981  /**
982  * 0 -> decoder has not been searched for yet.
983  * >0 -> decoder found
984  * <0 -> decoder with codec_id == -found_decoder has not been found
985  */
988  int64_t last_duration;
989 
990  /**
991  * Those are used for average framerate estimation.
992  */
993  int64_t fps_first_dts;
995  int64_t fps_last_dts;
997 
998  } *info;
999 
1000  int pts_wrap_bits; /**< number of bits in pts (used for wrapping control) */
1002  // Timestamp generation support:
1003  /**
1004  * Timestamp corresponding to the last dts sync point.
1005  *
1006  * Initialized when AVCodecParserContext.dts_sync_point >= 0 and
1007  * a DTS is received from the underlying container. Otherwise set to
1008  * AV_NOPTS_VALUE by default.
1009  */
1010  int64_t first_dts;
1011  int64_t cur_dts;
1012  int64_t last_IP_pts;
1013  int last_IP_duration;
1014 
1015  /**
1016  * Number of packets to buffer for codec probing
1017  */
1018 #define MAX_PROBE_PACKETS 2500
1021  /**
1022  * Number of frames that have been demuxed during av_find_stream_info()
1023  */
1025 
1026  /* av_read_frame() support */
1028  struct AVCodecParserContext *parser;
1029 
1030  /**
1031  * last packet in packet_buffer for this stream when muxing.
1032  */
1035 #define MAX_REORDER_DELAY 16
1037 
1038  AVIndexEntry *index_entries; /**< Only used if the format does not
1039  support seeking natively. */
1040  int nb_index_entries;
1043  /**
1044  * Real base framerate of the stream.
1045  * This is the lowest framerate with which all timestamps can be
1046  * represented accurately (it is the least common multiple of all
1047  * framerates in the stream). Note, this value is just a guess!
1048  * For example, if the time base is 1/90000 and all frames have either
1049  * approximately 3600 or 1800 timer ticks, then r_frame_rate will be 50/1.
1050  *
1051  * Code outside avformat should access this field using:
1052  * av_stream_get/set_r_frame_rate(stream)
1053  */
1055 
1056  /**
1057  * Stream Identifier
1058  * This is the MPEG-TS stream identifier +1
1059  * 0 means unknown
1060  */
1061  int stream_identifier;
1063  int64_t interleaver_chunk_size;
1065 
1066  /**
1067  * stream probing state
1068  * -1 -> probing finished
1069  * 0 -> no probing requested
1070  * rest -> perform probing with request_probe being the minimum score to accept.
1071  * NOT PART OF PUBLIC API
1072  */
1073  int request_probe;
1074  /**
1075  * Indicates that everything up to the next keyframe
1076  * should be discarded.
1077  */
1078  int skip_to_keyframe;
1079 
1080  /**
1081  * Number of samples to skip at the start of the frame decoded from the next packet.
1082  */
1083  int skip_samples;
1084 
1085  /**
1086  * If not 0, the number of samples that should be skipped from the start of
1087  * the stream (the samples are removed from packets with pts==0, which also
1088  * assumes negative timestamps do not happen).
1089  * Intended for use with formats such as mp3 with ad-hoc gapless audio
1090  * support.
1091  */
1092  int64_t start_skip_samples;
1093 
1094  /**
1095  * If not 0, the first audio sample that should be discarded from the stream.
1096  * This is broken by design (needs global sample count), but can't be
1097  * avoided for broken by design formats such as mp3 with ad-hoc gapless
1098  * audio support.
1099  */
1101 
1102  /**
1103  * The sample after last sample that is intended to be discarded after
1104  * first_discard_sample. Works on frame boundaries only. Used to prevent
1105  * early EOF if the gapless info is broken (considered concatenated mp3s).
1106  */
1107  int64_t last_discard_sample;
1109  /**
1110  * Number of internally decoded frames, used internally in libavformat, do not access
1111  * its lifetime differs from info which is why it is not in that structure.
1112  */
1113  int nb_decoded_frames;
1114 
1115  /**
1116  * Timestamp offset added to timestamps before muxing
1117  * NOT PART OF PUBLIC API
1118  */
1119  int64_t mux_ts_offset;
1120 
1121  /**
1122  * Internal data to check for wrapping of the time stamp
1123  */
1124  int64_t pts_wrap_reference;
1125 
1126  /**
1127  * Options for behavior, when a wrap is detected.
1128  *
1129  * Defined by AV_PTS_WRAP_ values.
1130  *
1131  * If correction is enabled, there are two possibilities:
1132  * If the first time stamp is near the wrap point, the wrap offset
1133  * will be subtracted, which will create negative time stamps.
1134  * Otherwise the offset will be added.
1135  */
1136  int pts_wrap_behavior;
1137 
1138  /**
1139  * Internal data to prevent doing update_initial_durations() twice
1140  */
1142 
1143  /**
1144  * Internal data to generate dts from pts
1145  */
1148 
1149  /**
1150  * Internal data to analyze DTS and detect faulty mpeg streams
1151  */
1152  int64_t last_dts_for_order_check;
1156  /**
1157  * Internal data to inject global side data
1158  */
1161  /**
1162  * String containing paris of key and values describing recommended encoder configuration.
1163  * Paris are separated by ','.
1164  * Keys are separated from values by '='.
1165  */
1168  /**
1169  * display aspect ratio (0 if unknown)
1170  * - encoding: unused
1171  * - decoding: Set by libavformat to calculate sample_aspect_ratio internally
1172  */
1175 
1180 void av_stream_set_recommended_encoder_configuration(AVStream *s, char *configuration);
1182 /**
1183  * Returns the pts of the last muxed packet + its duration
1184  *
1185  * the retuned value is undefined when used with a demuxer.
1186  */
1187 int64_t av_stream_get_end_pts(const AVStream *st);
1188 
1189 #define AV_PROGRAM_RUNNING 1
1190 
1191 /**
1192  * New fields can be added to the end with minor version bumps.
1193  * Removal, reordering and changes to existing fields require a major
1194  * version bump.
1195  * sizeof(AVProgram) must not be used outside libav*.
1196  */
1197 typedef struct AVProgram {
1198  int id;
1199  int flags;
1200  enum AVDiscard discard; ///< selects which program to discard and which to feed to the caller
1201  unsigned int *stream_index;
1202  unsigned int nb_stream_indexes;
1204 
1206  int pmt_pid;
1207  int pcr_pid;
1209  /*****************************************************************
1210  * All fields below this line are not part of the public API. They
1211  * may not be used outside of libavformat and can be changed and
1212  * removed at will.
1213  * New public fields should be added right above.
1214  *****************************************************************
1215  */
1216  int64_t start_time;
1217  int64_t end_time;
1218 
1219  int64_t pts_wrap_reference; ///< reference dts for wrap detection
1220  int pts_wrap_behavior; ///< behavior on wrap detection
1221 } AVProgram;
1222 
1223 #define AVFMTCTX_NOHEADER 0x0001 /**< signal that no header is present
1224  (streams are added dynamically) */
1226 typedef struct AVChapter {
1227  int id; ///< unique ID to identify the chapter
1228  AVRational time_base; ///< time base in which the start/end timestamps are specified
1229  int64_t start, end; ///< chapter start/end time in time_base units
1232 
1233 
1234 /**
1235  * Callback used by devices to communicate with application.
1236  */
1237 typedef int (*av_format_control_message)(struct AVFormatContext *s, int type,
1238  void *data, size_t data_size);
1240 typedef int (*AVOpenCallback)(struct AVFormatContext *s, AVIOContext **pb, const char *url, int flags,
1242 
1243 /**
1244  * The duration of a video can be estimated through various ways, and this enum can be used
1245  * to know how the duration was estimated.
1246  */
1248  AVFMT_DURATION_FROM_PTS, ///< Duration accurately estimated from PTSes
1249  AVFMT_DURATION_FROM_STREAM, ///< Duration estimated from a stream with a known duration
1250  AVFMT_DURATION_FROM_BITRATE ///< Duration estimated from bitrate (less accurate)
1251 };
1252 
1253 typedef struct AVFormatInternal AVFormatInternal;
1254 
1255 /**
1256  * Format I/O context.
1257  * New fields can be added to the end with minor version bumps.
1258  * Removal, reordering and changes to existing fields require a major
1259  * version bump.
1260  * sizeof(AVFormatContext) must not be used outside libav*, use
1261  * avformat_alloc_context() to create an AVFormatContext.
1262  */
1263 typedef struct AVFormatContext {
1264  /**
1265  * A class for logging and @ref avoptions. Set by avformat_alloc_context().
1266  * Exports (de)muxer private options if they exist.
1267  */
1268  const AVClass *av_class;
1269 
1270  /**
1271  * The input container format.
1272  *
1273  * Demuxing only, set by avformat_open_input().
1274  */
1275  struct AVInputFormat *iformat;
1276 
1277  /**
1278  * The output container format.
1279  *
1280  * Muxing only, must be set by the caller before avformat_write_header().
1281  */
1282  struct AVOutputFormat *oformat;
1283 
1284  /**
1285  * Format private data. This is an AVOptions-enabled struct
1286  * if and only if iformat/oformat.priv_class is not NULL.
1287  *
1288  * - muxing: set by avformat_write_header()
1289  * - demuxing: set by avformat_open_input()
1290  */
1291  void *priv_data;
1292 
1293  /**
1294  * I/O context.
1295  *
1296  * - demuxing: either set by the user before avformat_open_input() (then
1297  * the user must close it manually) or set by avformat_open_input().
1298  * - muxing: set by the user before avformat_write_header(). The caller must
1299  * take care of closing / freeing the IO context.
1300  *
1301  * Do NOT set this field if AVFMT_NOFILE flag is set in
1302  * iformat/oformat.flags. In such a case, the (de)muxer will handle
1303  * I/O in some other way and this field will be NULL.
1304  */
1305  AVIOContext *pb;
1306 
1307  /* stream info */
1308  /**
1309  * Flags signalling stream properties. A combination of AVFMTCTX_*.
1310  * Set by libavformat.
1311  */
1312  int ctx_flags;
1313 
1314  /**
1315  * Number of elements in AVFormatContext.streams.
1316  *
1317  * Set by avformat_new_stream(), must not be modified by any other code.
1318  */
1319  unsigned int nb_streams;
1320  /**
1321  * A list of all streams in the file. New streams are created with
1322  * avformat_new_stream().
1323  *
1324  * - demuxing: streams are created by libavformat in avformat_open_input().
1325  * If AVFMTCTX_NOHEADER is set in ctx_flags, then new streams may also
1326  * appear in av_read_frame().
1327  * - muxing: streams are created by the user before avformat_write_header().
1328  *
1329  * Freed by libavformat in avformat_free_context().
1330  */
1331  AVStream **streams;
1332 
1333  /**
1334  * input or output filename
1335  *
1336  * - demuxing: set by avformat_open_input()
1337  * - muxing: may be set by the caller before avformat_write_header()
1338  */
1339  char filename[1024];
1341  /**
1342  * Position of the first frame of the component, in
1343  * AV_TIME_BASE fractional seconds. NEVER set this value directly:
1344  * It is deduced from the AVStream values.
1345  *
1346  * Demuxing only, set by libavformat.
1347  */
1348  int64_t start_time;
1349 
1350  /**
1351  * Duration of the stream, in AV_TIME_BASE fractional
1352  * seconds. Only set this value if you know none of the individual stream
1353  * durations and also do not set any of them. This is deduced from the
1354  * AVStream values if not set.
1355  *
1356  * Demuxing only, set by libavformat.
1357  */
1358  int64_t duration;
1359 
1360  /**
1361  * Total stream bitrate in bit/s, 0 if not
1362  * available. Never set it directly if the file_size and the
1363  * duration are known as FFmpeg can compute it automatically.
1364  */
1365  int bit_rate;
1366 
1367  unsigned int packet_size;
1368  int max_delay;
1369 
1370  /**
1371  * Flags modifying the (de)muxer behaviour. A combination of AVFMT_FLAG_*.
1372  * Set by the user before avformat_open_input() / avformat_write_header().
1373  */
1374  int flags;
1375 #define AVFMT_FLAG_GENPTS 0x0001 ///< Generate missing pts even if it requires parsing future frames.
1376 #define AVFMT_FLAG_IGNIDX 0x0002 ///< Ignore index.
1377 #define AVFMT_FLAG_NONBLOCK 0x0004 ///< Do not block when reading packets from input.
1378 #define AVFMT_FLAG_IGNDTS 0x0008 ///< Ignore DTS on frames that contain both DTS & PTS
1379 #define AVFMT_FLAG_NOFILLIN 0x0010 ///< Do not infer any values from other values, just return what is stored in the container
1380 #define AVFMT_FLAG_NOPARSE 0x0020 ///< Do not use AVParsers, you also must set AVFMT_FLAG_NOFILLIN as the fillin code works on frames and no parsing -> no frames. Also seeking to frames can not work if parsing to find frame boundaries has been disabled
1381 #define AVFMT_FLAG_NOBUFFER 0x0040 ///< Do not buffer frames when possible
1382 #define AVFMT_FLAG_CUSTOM_IO 0x0080 ///< The caller has supplied a custom AVIOContext, don't avio_close() it.
1383 #define AVFMT_FLAG_DISCARD_CORRUPT 0x0100 ///< Discard frames marked corrupted
1384 #define AVFMT_FLAG_FLUSH_PACKETS 0x0200 ///< Flush the AVIOContext every packet.
1385 /**
1386  * When muxing, try to avoid writing any random/volatile data to the output.
1387  * This includes any random IDs, real-time timestamps/dates, muxer version, etc.
1388  *
1389  * This flag is mainly intended for testing.
1390  */
1391 #define AVFMT_FLAG_BITEXACT 0x0400
1392 #define AVFMT_FLAG_MP4A_LATM 0x8000 ///< Enable RTP MP4A-LATM payload
1393 #define AVFMT_FLAG_SORT_DTS 0x10000 ///< try to interleave outputted packets by dts (using this flag can slow demuxing down)
1394 #define AVFMT_FLAG_PRIV_OPT 0x20000 ///< Enable use of private options by delaying codec open (this could be made default once all code is converted)
1395 #define AVFMT_FLAG_KEEP_SIDE_DATA 0x40000 ///< Don't merge side data but keep it separate.
1396 #define AVFMT_FLAG_FAST_SEEK 0x80000 ///< Enable fast, but inaccurate seeks for some formats
1397 
1398  /**
1399  * @deprecated deprecated in favor of probesize2
1400  */
1401  unsigned int probesize;
1403  /**
1404  * @deprecated deprecated in favor of max_analyze_duration2
1405  */
1408 
1409  const uint8_t *key;
1410  int keylen;
1411 
1412  unsigned int nb_programs;
1413  AVProgram **programs;
1414 
1415  /**
1416  * Forced video codec_id.
1417  * Demuxing: Set by user.
1418  */
1420 
1421  /**
1422  * Forced audio codec_id.
1423  * Demuxing: Set by user.
1424  */
1426 
1427  /**
1428  * Forced subtitle codec_id.
1429  * Demuxing: Set by user.
1430  */
1432 
1433  /**
1434  * Maximum amount of memory in bytes to use for the index of each stream.
1435  * If the index exceeds this size, entries will be discarded as
1436  * needed to maintain a smaller size. This can lead to slower or less
1437  * accurate seeking (depends on demuxer).
1438  * Demuxers for which a full in-memory index is mandatory will ignore
1439  * this.
1440  * - muxing: unused
1441  * - demuxing: set by user
1442  */
1443  unsigned int max_index_size;
1444 
1445  /**
1446  * Maximum amount of memory in bytes to use for buffering frames
1447  * obtained from realtime capture devices.
1448  */
1449  unsigned int max_picture_buffer;
1450 
1451  /**
1452  * Number of chapters in AVChapter array.
1453  * When muxing, chapters are normally written in the file header,
1454  * so nb_chapters should normally be initialized before write_header
1455  * is called. Some muxers (e.g. mov and mkv) can also write chapters
1456  * in the trailer. To write chapters in the trailer, nb_chapters
1457  * must be zero when write_header is called and non-zero when
1458  * write_trailer is called.
1459  * - muxing: set by user
1460  * - demuxing: set by libavformat
1461  */
1462  unsigned int nb_chapters;
1463  AVChapter **chapters;
1464 
1465  /**
1466  * Metadata that applies to the whole file.
1467  *
1468  * - demuxing: set by libavformat in avformat_open_input()
1469  * - muxing: may be set by the caller before avformat_write_header()
1470  *
1471  * Freed by libavformat in avformat_free_context().
1472  */
1474 
1475  /**
1476  * Start time of the stream in real world time, in microseconds
1477  * since the Unix epoch (00:00 1st January 1970). That is, pts=0 in the
1478  * stream was captured at this real world time.
1479  * - muxing: Set by the caller before avformat_write_header(). If set to
1480  * either 0 or AV_NOPTS_VALUE, then the current wall-time will
1481  * be used.
1482  * - demuxing: Set by libavformat. AV_NOPTS_VALUE if unknown. Note that
1483  * the value may become known after some number of frames
1484  * have been received.
1485  */
1486  int64_t start_time_realtime;
1487 
1488  /**
1489  * The number of frames used for determining the framerate in
1490  * avformat_find_stream_info().
1491  * Demuxing only, set by the caller before avformat_find_stream_info().
1492  */
1493  int fps_probe_size;
1494 
1495  /**
1496  * Error recognition; higher values will detect more errors but may
1497  * misdetect some more or less valid parts as errors.
1498  * Demuxing only, set by the caller before avformat_open_input().
1499  */
1500  int error_recognition;
1501 
1502  /**
1503  * Custom interrupt callbacks for the I/O layer.
1504  *
1505  * demuxing: set by the user before avformat_open_input().
1506  * muxing: set by the user before avformat_write_header()
1507  * (mainly useful for AVFMT_NOFILE formats). The callback
1508  * should also be passed to avio_open2() if it's used to
1509  * open the file.
1510  */
1512 
1513  /**
1514  * Flags to enable debugging.
1515  */
1516  int debug;
1517 #define FF_FDEBUG_TS 0x0001
1518 
1519  /**
1520  * Maximum buffering duration for interleaving.
1521  *
1522  * To ensure all the streams are interleaved correctly,
1523  * av_interleaved_write_frame() will wait until it has at least one packet
1524  * for each stream before actually writing any packets to the output file.
1525  * When some streams are "sparse" (i.e. there are large gaps between
1526  * successive packets), this can result in excessive buffering.
1527  *
1528  * This field specifies the maximum difference between the timestamps of the
1529  * first and the last packet in the muxing queue, above which libavformat
1530  * will output a packet regardless of whether it has queued a packet for all
1531  * the streams.
1532  *
1533  * Muxing only, set by the caller before avformat_write_header().
1534  */
1535  int64_t max_interleave_delta;
1536 
1537  /**
1538  * Allow non-standard and experimental extension
1539  * @see AVCodecContext.strict_std_compliance
1540  */
1542 
1543  /**
1544  * Flags for the user to detect events happening on the file. Flags must
1545  * be cleared by the user once the event has been handled.
1546  * A combination of AVFMT_EVENT_FLAG_*.
1547  */
1548  int event_flags;
1549 #define AVFMT_EVENT_FLAG_METADATA_UPDATED 0x0001 ///< The call resulted in updated metadata.
1551  /**
1552  * Maximum number of packets to read while waiting for the first timestamp.
1553  * Decoding only.
1554  */
1555  int max_ts_probe;
1556 
1557  /**
1558  * Avoid negative timestamps during muxing.
1559  * Any value of the AVFMT_AVOID_NEG_TS_* constants.
1560  * Note, this only works when using av_interleaved_write_frame. (interleave_packet_per_dts is in use)
1561  * - muxing: Set by user
1562  * - demuxing: unused
1563  */
1565 #define AVFMT_AVOID_NEG_TS_AUTO -1 ///< Enabled when required by target format
1566 #define AVFMT_AVOID_NEG_TS_MAKE_NON_NEGATIVE 1 ///< Shift timestamps so they are non negative
1567 #define AVFMT_AVOID_NEG_TS_MAKE_ZERO 2 ///< Shift timestamps so that they start at 0
1568 
1569  /**
1570  * Transport stream id.
1571  * This will be moved into demuxer private options. Thus no API/ABI compatibility
1572  */
1573  int ts_id;
1575  /**
1576  * Audio preload in microseconds.
1577  * Note, not all formats support this and unpredictable things may happen if it is used when not supported.
1578  * - encoding: Set by user via AVOptions (NO direct access)
1579  * - decoding: unused
1580  */
1581  int audio_preload;
1583  /**
1584  * Max chunk time in microseconds.
1585  * Note, not all formats support this and unpredictable things may happen if it is used when not supported.
1586  * - encoding: Set by user via AVOptions (NO direct access)
1587  * - decoding: unused
1588  */
1589  int max_chunk_duration;
1591  /**
1592  * Max chunk size in bytes
1593  * Note, not all formats support this and unpredictable things may happen if it is used when not supported.
1594  * - encoding: Set by user via AVOptions (NO direct access)
1595  * - decoding: unused
1596  */
1597  int max_chunk_size;
1599  /**
1600  * forces the use of wallclock timestamps as pts/dts of packets
1601  * This has undefined results in the presence of B frames.
1602  * - encoding: unused
1603  * - decoding: Set by user via AVOptions (NO direct access)
1604  */
1607  /**
1608  * avio flags, used to force AVIO_FLAG_DIRECT.
1609  * - encoding: unused
1610  * - decoding: Set by user via AVOptions (NO direct access)
1611  */
1612  int avio_flags;
1613 
1614  /**
1615  * The duration field can be estimated through various ways, and this field can be used
1616  * to know how the duration was estimated.
1617  * - encoding: unused
1618  * - decoding: Read by user via AVOptions (NO direct access)
1619  */
1622  /**
1623  * Skip initial bytes when opening stream
1624  * - encoding: unused
1625  * - decoding: Set by user via AVOptions (NO direct access)
1626  */
1627  int64_t skip_initial_bytes;
1628 
1629  /**
1630  * Correct single timestamp overflows
1631  * - encoding: unused
1632  * - decoding: Set by user via AVOptions (NO direct access)
1633  */
1634  unsigned int correct_ts_overflow;
1635 
1636  /**
1637  * Force seeking to any (also non key) frames.
1638  * - encoding: unused
1639  * - decoding: Set by user via AVOptions (NO direct access)
1640  */
1641  int seek2any;
1642 
1643  /**
1644  * Flush the I/O context after each packet.
1645  * - encoding: Set by user via AVOptions (NO direct access)
1646  * - decoding: unused
1647  */
1648  int flush_packets;
1649 
1650  /**
1651  * format probing score.
1652  * The maximal score is AVPROBE_SCORE_MAX, its set when the demuxer probes
1653  * the format.
1654  * - encoding: unused
1655  * - decoding: set by avformat, read by user via av_format_get_probe_score() (NO direct access)
1656  */
1658 
1659  /**
1660  * number of bytes to read maximally to identify format.
1661  * - encoding: unused
1662  * - decoding: set by user through AVOPtions (NO direct access)
1663  */
1664  int format_probesize;
1665 
1666  /**
1667  * ',' separated list of allowed decoders.
1668  * If NULL then all are allowed
1669  * - encoding: unused
1670  * - decoding: set by user through AVOptions (NO direct access)
1671  */
1672  char *codec_whitelist;
1674  /**
1675  * ',' separated list of allowed demuxers.
1676  * If NULL then all are allowed
1677  * - encoding: unused
1678  * - decoding: set by user through AVOptions (NO direct access)
1679  */
1680  char *format_whitelist;
1682  /**
1683  * An opaque field for libavformat internal usage.
1684  * Must not be accessed in any way by callers.
1685  */
1686  AVFormatInternal *internal;
1687 
1688  /**
1689  * IO repositioned flag.
1690  * This is set by avformat when the underlaying IO context read pointer
1691  * is repositioned, for example when doing byte based seeking.
1692  * Demuxers can use the flag to detect such changes.
1693  */
1694  int io_repositioned;
1696  /**
1697  * Forced video codec.
1698  * This allows forcing a specific decoder, even when there are multiple with
1699  * the same codec_id.
1700  * Demuxing: Set by user via av_format_set_video_codec (NO direct access).
1701  */
1704  /**
1705  * Forced audio codec.
1706  * This allows forcing a specific decoder, even when there are multiple with
1707  * the same codec_id.
1708  * Demuxing: Set by user via av_format_set_audio_codec (NO direct access).
1709  */
1712  /**
1713  * Forced subtitle codec.
1714  * This allows forcing a specific decoder, even when there are multiple with
1715  * the same codec_id.
1716  * Demuxing: Set by user via av_format_set_subtitle_codec (NO direct access).
1717  */
1720  /**
1721  * Forced data codec.
1722  * This allows forcing a specific decoder, even when there are multiple with
1723  * the same codec_id.
1724  * Demuxing: Set by user via av_format_set_data_codec (NO direct access).
1725  */
1728  /**
1729  * Number of bytes to be written as padding in a metadata header.
1730  * Demuxing: Unused.
1731  * Muxing: Set by user via av_format_set_metadata_header_padding.
1732  */
1734 
1735  /**
1736  * User data.
1737  * This is a place for some private data of the user.
1738  * Mostly usable with control_message_cb or any future callbacks in device's context.
1739  */
1740  void *opaque;
1741 
1742  /**
1743  * Callback used by devices to communicate with application.
1744  */
1746 
1747  /**
1748  * Output timestamp offset, in microseconds.
1749  * Muxing: set by user via AVOptions (NO direct access)
1750  */
1751  int64_t output_ts_offset;
1752 
1753  /**
1754  * Maximum duration (in AV_TIME_BASE units) of the data read
1755  * from input in avformat_find_stream_info().
1756  * Demuxing only, set by the caller before avformat_find_stream_info()
1757  * via AVOptions (NO direct access).
1758  * Can be set to 0 to let avformat choose using a heuristic.
1759  */
1761 
1762  /**
1763  * Maximum size of the data read from input for determining
1764  * the input container format.
1765  * Demuxing only, set by the caller before avformat_open_input()
1766  * via AVOptions (NO direct access).
1767  */
1768  int64_t probesize2;
1770  /**
1771  * dump format separator.
1772  * can be ", " or "\n " or anything else
1773  * Code outside libavformat should access this field using AVOptions
1774  * (NO direct access).
1775  * - muxing: Set by user.
1776  * - demuxing: Set by user.
1777  */
1779 
1780  /**
1781  * Forced Data codec_id.
1782  * Demuxing: Set by user.
1783  */
1784  enum AVCodecID data_codec_id;
1785 
1786  /**
1787  * Called to open further IO contexts when needed for demuxing.
1788  *
1789  * This can be set by the user application to perform security checks on
1790  * the URLs before opening them.
1791  * The function should behave like avio_open2(), AVFormatContext is provided
1792  * as contextual information and to reach AVFormatContext.opaque.
1793  *
1794  * If NULL then some simple checks are used together with avio_open2().
1795  *
1796  * Must not be accessed directly from outside avformat.
1797  * @See av_format_set_open_cb()
1798  *
1799  * Demuxing: Set by user.
1800  */
1801  int (*open_cb)(struct AVFormatContext *s, AVIOContext **p, const char *url, int flags, const AVIOInterruptCB *int_cb, AVDictionary **options);
1802 } AVFormatContext;
1803 
1815 void * av_format_get_opaque(const AVFormatContext *s);
1821 
1822 /**
1823  * This function will cause global side data to be injected in the next packet
1824  * of each stream as well as after any subsequent seek.
1825  */
1827 
1828 /**
1829  * Returns the method used to set ctx->duration.
1830  *
1831  * @return AVFMT_DURATION_FROM_PTS, AVFMT_DURATION_FROM_STREAM, or AVFMT_DURATION_FROM_BITRATE.
1832  */
1834 
1835 typedef struct AVPacketList {
1836  AVPacket pkt;
1837  struct AVPacketList *next;
1838 } AVPacketList;
1839 
1840 
1841 /**
1842  * @defgroup lavf_core Core functions
1843  * @ingroup libavf
1844  *
1845  * Functions for querying libavformat capabilities, allocating core structures,
1846  * etc.
1847  * @{
1848  */
1849 
1850 /**
1851  * Return the LIBAVFORMAT_VERSION_INT constant.
1852  */
1853 unsigned avformat_version(void);
1854 
1855 /**
1856  * Return the libavformat build-time configuration.
1857  */
1858 const char *avformat_configuration(void);
1859 
1860 /**
1861  * Return the libavformat license.
1862  */
1863 const char *avformat_license(void);
1864 
1865 /**
1866  * Initialize libavformat and register all the muxers, demuxers and
1867  * protocols. If you do not call this function, then you can select
1868  * exactly which formats you want to support.
1869  *
1870  * @see av_register_input_format()
1871  * @see av_register_output_format()
1872  */
1873 void av_register_all(void);
1874 
1877 
1878 /**
1879  * Do global initialization of network components. This is optional,
1880  * but recommended, since it avoids the overhead of implicitly
1881  * doing the setup for each session.
1882  *
1883  * Calling this function will become mandatory if using network
1884  * protocols at some major version bump.
1885  */
1886 int avformat_network_init(void);
1887 
1888 /**
1889  * Undo the initialization done by avformat_network_init.
1890  */
1891 int avformat_network_deinit(void);
1892 
1893 /**
1894  * If f is NULL, returns the first registered input format,
1895  * if f is non-NULL, returns the next registered input format after f
1896  * or NULL if f is the last one.
1897  */
1899 
1900 /**
1901  * If f is NULL, returns the first registered output format,
1902  * if f is non-NULL, returns the next registered output format after f
1903  * or NULL if f is the last one.
1904  */
1906 
1907 /**
1908  * Allocate an AVFormatContext.
1909  * avformat_free_context() can be used to free the context and everything
1910  * allocated by the framework within it.
1911  */
1913 
1914 /**
1915  * Free an AVFormatContext and all its streams.
1916  * @param s context to free
1917  */
1919 
1920 /**
1921  * Get the AVClass for AVFormatContext. It can be used in combination with
1922  * AV_OPT_SEARCH_FAKE_OBJ for examining options.
1923  *
1924  * @see av_opt_find().
1925  */
1926 const AVClass *avformat_get_class(void);
1927 
1928 /**
1929  * Add a new stream to a media file.
1930  *
1931  * When demuxing, it is called by the demuxer in read_header(). If the
1932  * flag AVFMTCTX_NOHEADER is set in s.ctx_flags, then it may also
1933  * be called in read_packet().
1934  *
1935  * When muxing, should be called by the user before avformat_write_header().
1936  *
1937  * User is required to call avcodec_close() and avformat_free_context() to
1938  * clean up the allocation by avformat_new_stream().
1939  *
1940  * @param s media file handle
1941  * @param c If non-NULL, the AVCodecContext corresponding to the new stream
1942  * will be initialized to use this codec. This is needed for e.g. codec-specific
1943  * defaults to be set, so codec should be provided if it is known.
1944  *
1945  * @return newly created stream or NULL on error.
1946  */
1948 
1949 /**
1950  * Get side information from stream.
1951  *
1952  * @param stream stream
1953  * @param type desired side information type
1954  * @param size pointer for side information size to store (optional)
1955  * @return pointer to data if present or NULL otherwise
1956  */
1958  enum AVPacketSideDataType type, int *size);
1959 
1961 
1962 /**
1963  * @}
1964  */
1965 
1966 
1967 /**
1968  * Allocate an AVFormatContext for an output format.
1969  * avformat_free_context() can be used to free the context and
1970  * everything allocated by the framework within it.
1971  *
1972  * @param *ctx is set to the created format context, or to NULL in
1973  * case of failure
1974  * @param oformat format to use for allocating the context, if NULL
1975  * format_name and filename are used instead
1976  * @param format_name the name of output format to use for allocating the
1977  * context, if NULL filename is used instead
1978  * @param filename the name of the filename to use for allocating the
1979  * context, may be NULL
1980  * @return >= 0 in case of success, a negative AVERROR code in case of
1981  * failure
1982  */
1984  const char *format_name, const char *filename);
1985 
1986 /**
1987  * @addtogroup lavf_decoding
1988  * @{
1989  */
1990 
1991 /**
1992  * Find AVInputFormat based on the short name of the input format.
1993  */
1994 AVInputFormat *av_find_input_format(const char *short_name);
1995 
1996 /**
1997  * Guess the file format.
1998  *
1999  * @param pd data to be probed
2000  * @param is_opened Whether the file is already opened; determines whether
2001  * demuxers with or without AVFMT_NOFILE are probed.
2002  */
2003 AVInputFormat *av_probe_input_format(AVProbeData *pd, int is_opened);
2004 
2005 /**
2006  * Guess the file format.
2007  *
2008  * @param pd data to be probed
2009  * @param is_opened Whether the file is already opened; determines whether
2010  * demuxers with or without AVFMT_NOFILE are probed.
2011  * @param score_max A probe score larger that this is required to accept a
2012  * detection, the variable is set to the actual detection
2013  * score afterwards.
2014  * If the score is <= AVPROBE_SCORE_MAX / 4 it is recommended
2015  * to retry with a larger probe buffer.
2016  */
2017 AVInputFormat *av_probe_input_format2(AVProbeData *pd, int is_opened, int *score_max);
2018 
2019 /**
2020  * Guess the file format.
2021  *
2022  * @param is_opened Whether the file is already opened; determines whether
2023  * demuxers with or without AVFMT_NOFILE are probed.
2024  * @param score_ret The score of the best detection.
2025  */
2026 AVInputFormat *av_probe_input_format3(AVProbeData *pd, int is_opened, int *score_ret);
2027 
2028 /**
2029  * Probe a bytestream to determine the input format. Each time a probe returns
2030  * with a score that is too low, the probe buffer size is increased and another
2031  * attempt is made. When the maximum probe size is reached, the input format
2032  * with the highest score is returned.
2033  *
2034  * @param pb the bytestream to probe
2035  * @param fmt the input format is put here
2036  * @param filename the filename of the stream
2037  * @param logctx the log context
2038  * @param offset the offset within the bytestream to probe from
2039  * @param max_probe_size the maximum probe buffer size (zero for default)
2040  * @return the score in case of success, a negative value corresponding to an
2041  * the maximal score is AVPROBE_SCORE_MAX
2042  * AVERROR code otherwise
2043  */
2045  const char *filename, void *logctx,
2046  unsigned int offset, unsigned int max_probe_size);
2047 
2048 /**
2049  * Like av_probe_input_buffer2() but returns 0 on success
2050  */
2052  const char *filename, void *logctx,
2053  unsigned int offset, unsigned int max_probe_size);
2054 
2055 /**
2056  * Open an input stream and read the header. The codecs are not opened.
2057  * The stream must be closed with avformat_close_input().
2058  *
2059  * @param ps Pointer to user-supplied AVFormatContext (allocated by avformat_alloc_context).
2060  * May be a pointer to NULL, in which case an AVFormatContext is allocated by this
2061  * function and written into ps.
2062  * Note that a user-supplied AVFormatContext will be freed on failure.
2063  * @param filename Name of the stream to open.
2064  * @param fmt If non-NULL, this parameter forces a specific input format.
2065  * Otherwise the format is autodetected.
2066  * @param options A dictionary filled with AVFormatContext and demuxer-private options.
2067  * On return this parameter will be destroyed and replaced with a dict containing
2068  * options that were not found. May be NULL.
2069  *
2070  * @return 0 on success, a negative AVERROR on failure.
2071  *
2072  * @note If you want to use custom IO, preallocate the format context and set its pb field.
2073  */
2074 int avformat_open_input(AVFormatContext **ps, const char *filename, AVInputFormat *fmt, AVDictionary **options);
2075 
2078 
2079 /**
2080  * Read packets of a media file to get stream information. This
2081  * is useful for file formats with no headers such as MPEG. This
2082  * function also computes the real framerate in case of MPEG-2 repeat
2083  * frame mode.
2084  * The logical file position is not changed by this function;
2085  * examined packets may be buffered for later processing.
2086  *
2087  * @param ic media file handle
2088  * @param options If non-NULL, an ic.nb_streams long array of pointers to
2089  * dictionaries, where i-th member contains options for
2090  * codec corresponding to i-th stream.
2091  * On return each dictionary will be filled with options that were not found.
2092  * @return >=0 if OK, AVERROR_xxx on error
2093  *
2094  * @note this function isn't guaranteed to open all the codecs, so
2095  * options being non-empty at return is a perfectly normal behavior.
2096  *
2097  * @todo Let the user decide somehow what information is needed so that
2098  * we do not waste time getting stuff the user does not need.
2099  */
2101 
2102 /**
2103  * Find the programs which belong to a given stream.
2104  *
2105  * @param ic media file handle
2106  * @param last the last found program, the search will start after this
2107  * program, or from the beginning if it is NULL
2108  * @param s stream index
2109  * @return the next program which belongs to s, NULL if no program is found or
2110  * the last program is not among the programs of ic.
2111  */
2113 
2114 /**
2115  * Find the "best" stream in the file.
2116  * The best stream is determined according to various heuristics as the most
2117  * likely to be what the user expects.
2118  * If the decoder parameter is non-NULL, av_find_best_stream will find the
2119  * default decoder for the stream's codec; streams for which no decoder can
2120  * be found are ignored.
2121  *
2122  * @param ic media file handle
2123  * @param type stream type: video, audio, subtitles, etc.
2124  * @param wanted_stream_nb user-requested stream number,
2125  * or -1 for automatic selection
2126  * @param related_stream try to find a stream related (eg. in the same
2127  * program) to this one, or -1 if none
2128  * @param decoder_ret if non-NULL, returns the decoder for the
2129  * selected stream
2130  * @param flags flags; none are currently defined
2131  * @return the non-negative stream number in case of success,
2132  * AVERROR_STREAM_NOT_FOUND if no stream with the requested type
2133  * could be found,
2134  * AVERROR_DECODER_NOT_FOUND if streams were found but no decoder
2135  * @note If av_find_best_stream returns successfully and decoder_ret is not
2136  * NULL, then *decoder_ret is guaranteed to be set to a valid AVCodec.
2137  */
2139  enum AVMediaType type,
2140  int wanted_stream_nb,
2141  int related_stream,
2142  AVCodec **decoder_ret,
2143  int flags);
2144 
2145 /**
2146  * Return the next frame of a stream.
2147  * This function returns what is stored in the file, and does not validate
2148  * that what is there are valid frames for the decoder. It will split what is
2149  * stored in the file into frames and return one for each call. It will not
2150  * omit invalid data between valid frames so as to give the decoder the maximum
2151  * information possible for decoding.
2152  *
2153  * If pkt->buf is NULL, then the packet is valid until the next
2154  * av_read_frame() or until avformat_close_input(). Otherwise the packet
2155  * is valid indefinitely. In both cases the packet must be freed with
2156  * av_free_packet when it is no longer needed. For video, the packet contains
2157  * exactly one frame. For audio, it contains an integer number of frames if each
2158  * frame has a known fixed size (e.g. PCM or ADPCM data). If the audio frames
2159  * have a variable size (e.g. MPEG audio), then it contains one frame.
2160  *
2161  * pkt->pts, pkt->dts and pkt->duration are always set to correct
2162  * values in AVStream.time_base units (and guessed if the format cannot
2163  * provide them). pkt->pts can be AV_NOPTS_VALUE if the video format
2164  * has B-frames, so it is better to rely on pkt->dts if you do not
2165  * decompress the payload.
2166  *
2167  * @return 0 if OK, < 0 on error or end of file
2168  */
2170 
2171 /**
2172  * Seek to the keyframe at timestamp.
2173  * 'timestamp' in 'stream_index'.
2174  *
2175  * @param s media file handle
2176  * @param stream_index If stream_index is (-1), a default
2177  * stream is selected, and timestamp is automatically converted
2178  * from AV_TIME_BASE units to the stream specific time_base.
2179  * @param timestamp Timestamp in AVStream.time_base units
2180  * or, if no stream is specified, in AV_TIME_BASE units.
2181  * @param flags flags which select direction and seeking mode
2182  * @return >= 0 on success
2183  */
2184 int av_seek_frame(AVFormatContext *s, int stream_index, int64_t timestamp,
2185  int flags);
2186 
2187 /**
2188  * Seek to timestamp ts.
2189  * Seeking will be done so that the point from which all active streams
2190  * can be presented successfully will be closest to ts and within min/max_ts.
2191  * Active streams are all streams that have AVStream.discard < AVDISCARD_ALL.
2192  *
2193  * If flags contain AVSEEK_FLAG_BYTE, then all timestamps are in bytes and
2194  * are the file position (this may not be supported by all demuxers).
2195  * If flags contain AVSEEK_FLAG_FRAME, then all timestamps are in frames
2196  * in the stream with stream_index (this may not be supported by all demuxers).
2197  * Otherwise all timestamps are in units of the stream selected by stream_index
2198  * or if stream_index is -1, in AV_TIME_BASE units.
2199  * If flags contain AVSEEK_FLAG_ANY, then non-keyframes are treated as
2200  * keyframes (this may not be supported by all demuxers).
2201  * If flags contain AVSEEK_FLAG_BACKWARD, it is ignored.
2202  *
2203  * @param s media file handle
2204  * @param stream_index index of the stream which is used as time base reference
2205  * @param min_ts smallest acceptable timestamp
2206  * @param ts target timestamp
2207  * @param max_ts largest acceptable timestamp
2208  * @param flags flags
2209  * @return >=0 on success, error code otherwise
2210  *
2211  * @note This is part of the new seek API which is still under construction.
2212  * Thus do not use this yet. It may change at any time, do not expect
2213  * ABI compatibility yet!
2214  */
2215 int avformat_seek_file(AVFormatContext *s, int stream_index, int64_t min_ts, int64_t ts, int64_t max_ts, int flags);
2216 
2217 /**
2218  * Discard all internally buffered data. This can be useful when dealing with
2219  * discontinuities in the byte stream. Generally works only with formats that
2220  * can resync. This includes headerless formats like MPEG-TS/TS but should also
2221  * work with NUT, Ogg and in a limited way AVI for example.
2222  *
2223  * The set of streams, the detected duration, stream parameters and codecs do
2224  * not change when calling this function. If you want a complete reset, it's
2225  * better to open a new AVFormatContext.
2226  *
2227  * This does not flush the AVIOContext (s->pb). If necessary, call
2228  * avio_flush(s->pb) before calling this function.
2229  *
2230  * @param s media file handle
2231  * @return >=0 on success, error code otherwise
2232  */
2234 
2235 /**
2236  * Start playing a network-based stream (e.g. RTSP stream) at the
2237  * current position.
2238  */
2240 
2241 /**
2242  * Pause a network-based stream (e.g. RTSP stream).
2243  *
2244  * Use av_read_play() to resume it.
2245  */
2247 
2248 /**
2249  * Close an opened input AVFormatContext. Free it and all its contents
2250  * and set *s to NULL.
2251  */
2253 /**
2254  * @}
2255  */
2256 
2257 #define AVSEEK_FLAG_BACKWARD 1 ///< seek backward
2258 #define AVSEEK_FLAG_BYTE 2 ///< seeking based on position in bytes
2259 #define AVSEEK_FLAG_ANY 4 ///< seek to any frame, even non-keyframes
2260 #define AVSEEK_FLAG_FRAME 8 ///< seeking based on frame number
2261 
2262 /**
2263  * @addtogroup lavf_encoding
2264  * @{
2265  */
2266 /**
2267  * Allocate the stream private data and write the stream header to
2268  * an output media file.
2269  *
2270  * @param s Media file handle, must be allocated with avformat_alloc_context().
2271  * Its oformat field must be set to the desired output format;
2272  * Its pb field must be set to an already opened AVIOContext.
2273  * @param options An AVDictionary filled with AVFormatContext and muxer-private options.
2274  * On return this parameter will be destroyed and replaced with a dict containing
2275  * options that were not found. May be NULL.
2276  *
2277  * @return 0 on success, negative AVERROR on failure.
2278  *
2279  * @see av_opt_find, av_dict_set, avio_open, av_oformat_next.
2280  */
2282 
2283 /**
2284  * Write a packet to an output media file.
2285  *
2286  * This function passes the packet directly to the muxer, without any buffering
2287  * or reordering. The caller is responsible for correctly interleaving the
2288  * packets if the format requires it. Callers that want libavformat to handle
2289  * the interleaving should call av_interleaved_write_frame() instead of this
2290  * function.
2291  *
2292  * @param s media file handle
2293  * @param pkt The packet containing the data to be written. Note that unlike
2294  * av_interleaved_write_frame(), this function does not take
2295  * ownership of the packet passed to it (though some muxers may make
2296  * an internal reference to the input packet).
2297  * <br>
2298  * This parameter can be NULL (at any time, not just at the end), in
2299  * order to immediately flush data buffered within the muxer, for
2300  * muxers that buffer up data internally before writing it to the
2301  * output.
2302  * <br>
2303  * Packet's @ref AVPacket.stream_index "stream_index" field must be
2304  * set to the index of the corresponding stream in @ref
2305  * AVFormatContext.streams "s->streams". It is very strongly
2306  * recommended that timing information (@ref AVPacket.pts "pts", @ref
2307  * AVPacket.dts "dts", @ref AVPacket.duration "duration") is set to
2308  * correct values.
2309  * @return < 0 on error, = 0 if OK, 1 if flushed and there is no more data to flush
2310  *
2311  * @see av_interleaved_write_frame()
2312  */
2314 
2315 /**
2316  * Write a packet to an output media file ensuring correct interleaving.
2317  *
2318  * This function will buffer the packets internally as needed to make sure the
2319  * packets in the output file are properly interleaved in the order of
2320  * increasing dts. Callers doing their own interleaving should call
2321  * av_write_frame() instead of this function.
2322  *
2323  * @param s media file handle
2324  * @param pkt The packet containing the data to be written.
2325  * <br>
2326  * If the packet is reference-counted, this function will take
2327  * ownership of this reference and unreference it later when it sees
2328  * fit.
2329  * The caller must not access the data through this reference after
2330  * this function returns. If the packet is not reference-counted,
2331  * libavformat will make a copy.
2332  * <br>
2333  * This parameter can be NULL (at any time, not just at the end), to
2334  * flush the interleaving queues.
2335  * <br>
2336  * Packet's @ref AVPacket.stream_index "stream_index" field must be
2337  * set to the index of the corresponding stream in @ref
2338  * AVFormatContext.streams "s->streams". It is very strongly
2339  * recommended that timing information (@ref AVPacket.pts "pts", @ref
2340  * AVPacket.dts "dts", @ref AVPacket.duration "duration") is set to
2341  * correct values.
2342  *
2343  * @return 0 on success, a negative AVERROR on error. Libavformat will always
2344  * take care of freeing the packet, even if this function fails.
2345  *
2346  * @see av_write_frame(), AVFormatContext.max_interleave_delta
2347  */
2349 
2350 /**
2351  * Write a uncoded frame to an output media file.
2352  *
2353  * The frame must be correctly interleaved according to the container
2354  * specification; if not, then av_interleaved_write_frame() must be used.
2355  *
2356  * See av_interleaved_write_frame() for details.
2357  */
2358 int av_write_uncoded_frame(AVFormatContext *s, int stream_index,
2359  AVFrame *frame);
2360 
2361 /**
2362  * Write a uncoded frame to an output media file.
2363  *
2364  * If the muxer supports it, this function allows to write an AVFrame
2365  * structure directly, without encoding it into a packet.
2366  * It is mostly useful for devices and similar special muxers that use raw
2367  * video or PCM data and will not serialize it into a byte stream.
2368  *
2369  * To test whether it is possible to use it with a given muxer and stream,
2370  * use av_write_uncoded_frame_query().
2371  *
2372  * The caller gives up ownership of the frame and must not access it
2373  * afterwards.
2374  *
2375  * @return >=0 for success, a negative code on error
2376  */
2377 int av_interleaved_write_uncoded_frame(AVFormatContext *s, int stream_index,
2378  AVFrame *frame);
2379 
2380 /**
2381  * Test whether a muxer supports uncoded frame.
2382  *
2383  * @return >=0 if an uncoded frame can be written to that muxer and stream,
2384  * <0 if not
2385  */
2386 int av_write_uncoded_frame_query(AVFormatContext *s, int stream_index);
2387 
2388 /**
2389  * Write the stream trailer to an output media file and free the
2390  * file private data.
2391  *
2392  * May only be called after a successful call to avformat_write_header.
2393  *
2394  * @param s media file handle
2395  * @return 0 if OK, AVERROR_xxx on error
2396  */
2398 
2399 /**
2400  * Return the output format in the list of registered output formats
2401  * which best matches the provided parameters, or return NULL if
2402  * there is no match.
2403  *
2404  * @param short_name if non-NULL checks if short_name matches with the
2405  * names of the registered formats
2406  * @param filename if non-NULL checks if filename terminates with the
2407  * extensions of the registered formats
2408  * @param mime_type if non-NULL checks if mime_type matches with the
2409  * MIME type of the registered formats
2410  */
2411 AVOutputFormat *av_guess_format(const char *short_name,
2412  const char *filename,
2413  const char *mime_type);
2414 
2415 /**
2416  * Guess the codec ID based upon muxer and filename.
2417  */
2418 enum AVCodecID av_guess_codec(AVOutputFormat *fmt, const char *short_name,
2419  const char *filename, const char *mime_type,
2420  enum AVMediaType type);
2421 
2422 /**
2423  * Get timing information for the data currently output.
2424  * The exact meaning of "currently output" depends on the format.
2425  * It is mostly relevant for devices that have an internal buffer and/or
2426  * work in real time.
2427  * @param s media file handle
2428  * @param stream stream in the media file
2429  * @param[out] dts DTS of the last packet output for the stream, in stream
2430  * time_base units
2431  * @param[out] wall absolute time when that packet whas output,
2432  * in microsecond
2433  * @return 0 if OK, AVERROR(ENOSYS) if the format does not support it
2434  * Note: some formats or devices may not allow to measure dts and wall
2435  * atomically.
2436  */
2437 int av_get_output_timestamp(struct AVFormatContext *s, int stream,
2438  int64_t *dts, int64_t *wall);
2439 
2440 
2441 /**
2442  * @}
2443  */
2444 
2445 
2446 /**
2447  * @defgroup lavf_misc Utility functions
2448  * @ingroup libavf
2449  * @{
2450  *
2451  * Miscellaneous utility functions related to both muxing and demuxing
2452  * (or neither).
2453  */
2454 
2455 /**
2456  * Send a nice hexadecimal dump of a buffer to the specified file stream.
2457  *
2458  * @param f The file stream pointer where the dump should be sent to.
2459  * @param buf buffer
2460  * @param size buffer size
2461  *
2462  * @see av_hex_dump_log, av_pkt_dump2, av_pkt_dump_log2
2463  */
2464 void av_hex_dump(FILE *f, const uint8_t *buf, int size);
2465 
2466 /**
2467  * Send a nice hexadecimal dump of a buffer to the log.
2468  *
2469  * @param avcl A pointer to an arbitrary struct of which the first field is a
2470  * pointer to an AVClass struct.
2471  * @param level The importance level of the message, lower values signifying
2472  * higher importance.
2473  * @param buf buffer
2474  * @param size buffer size
2475  *
2476  * @see av_hex_dump, av_pkt_dump2, av_pkt_dump_log2
2477  */
2478 void av_hex_dump_log(void *avcl, int level, const uint8_t *buf, int size);
2479 
2480 /**
2481  * Send a nice dump of a packet to the specified file stream.
2482  *
2483  * @param f The file stream pointer where the dump should be sent to.
2484  * @param pkt packet to dump
2485  * @param dump_payload True if the payload must be displayed, too.
2486  * @param st AVStream that the packet belongs to
2487  */
2488 void av_pkt_dump2(FILE *f, const AVPacket *pkt, int dump_payload, const AVStream *st);
2489 
2490 
2491 /**
2492  * Send a nice dump of a packet to the log.
2493  *
2494  * @param avcl A pointer to an arbitrary struct of which the first field is a
2495  * pointer to an AVClass struct.
2496  * @param level The importance level of the message, lower values signifying
2497  * higher importance.
2498  * @param pkt packet to dump
2499  * @param dump_payload True if the payload must be displayed, too.
2500  * @param st AVStream that the packet belongs to
2501  */
2502 void av_pkt_dump_log2(void *avcl, int level, const AVPacket *pkt, int dump_payload,
2503  const AVStream *st);
2504 
2505 /**
2506  * Get the AVCodecID for the given codec tag tag.
2507  * If no codec id is found returns AV_CODEC_ID_NONE.
2508  *
2509  * @param tags list of supported codec_id-codec_tag pairs, as stored
2510  * in AVInputFormat.codec_tag and AVOutputFormat.codec_tag
2511  * @param tag codec tag to match to a codec ID
2512  */
2513 enum AVCodecID av_codec_get_id(const struct AVCodecTag * const *tags, unsigned int tag);
2514 
2515 /**
2516  * Get the codec tag for the given codec id id.
2517  * If no codec tag is found returns 0.
2518  *
2519  * @param tags list of supported codec_id-codec_tag pairs, as stored
2520  * in AVInputFormat.codec_tag and AVOutputFormat.codec_tag
2521  * @param id codec ID to match to a codec tag
2522  */
2523 unsigned int av_codec_get_tag(const struct AVCodecTag * const *tags, enum AVCodecID id);
2524 
2525 /**
2526  * Get the codec tag for the given codec id.
2527  *
2528  * @param tags list of supported codec_id - codec_tag pairs, as stored
2529  * in AVInputFormat.codec_tag and AVOutputFormat.codec_tag
2530  * @param id codec id that should be searched for in the list
2531  * @param tag A pointer to the found tag
2532  * @return 0 if id was not found in tags, > 0 if it was found
2533  */
2534 int av_codec_get_tag2(const struct AVCodecTag * const *tags, enum AVCodecID id,
2535  unsigned int *tag);
2536 
2538 
2539 /**
2540  * Get the index for a specific timestamp.
2541  *
2542  * @param st stream that the timestamp belongs to
2543  * @param timestamp timestamp to retrieve the index for
2544  * @param flags if AVSEEK_FLAG_BACKWARD then the returned index will correspond
2545  * to the timestamp which is <= the requested one, if backward
2546  * is 0, then it will be >=
2547  * if AVSEEK_FLAG_ANY seek to any frame, only keyframes otherwise
2548  * @return < 0 if no such timestamp could be found
2549  */
2550 int av_index_search_timestamp(AVStream *st, int64_t timestamp, int flags);
2551 
2552 /**
2553  * Add an index entry into a sorted list. Update the entry if the list
2554  * already contains it.
2555  *
2556  * @param timestamp timestamp in the time base of the given stream
2557  */
2558 int av_add_index_entry(AVStream *st, int64_t pos, int64_t timestamp,
2559  int size, int distance, int flags);
2560 
2561 
2562 /**
2563  * Split a URL string into components.
2564  *
2565  * The pointers to buffers for storing individual components may be null,
2566  * in order to ignore that component. Buffers for components not found are
2567  * set to empty strings. If the port is not found, it is set to a negative
2568  * value.
2569  *
2570  * @param proto the buffer for the protocol
2571  * @param proto_size the size of the proto buffer
2572  * @param authorization the buffer for the authorization
2573  * @param authorization_size the size of the authorization buffer
2574  * @param hostname the buffer for the host name
2575  * @param hostname_size the size of the hostname buffer
2576  * @param port_ptr a pointer to store the port number in
2577  * @param path the buffer for the path
2578  * @param path_size the size of the path buffer
2579  * @param url the URL to split
2580  */
2581 void av_url_split(char *proto, int proto_size,
2582  char *authorization, int authorization_size,
2583  char *hostname, int hostname_size,
2584  int *port_ptr,
2585  char *path, int path_size,
2586  const char *url);
2587 
2588 
2589 /**
2590  * Print detailed information about the input or output format, such as
2591  * duration, bitrate, streams, container, programs, metadata, side data,
2592  * codec and time base.
2593  *
2594  * @param ic the context to analyze
2595  * @param index index of the stream to dump information about
2596  * @param url the URL to print, such as source or destination file
2597  * @param is_output Select whether the specified context is an input(0) or output(1)
2598  */
2600  int index,
2601  const char *url,
2602  int is_output);
2603 
2604 /**
2605  * Return in 'buf' the path with '%d' replaced by a number.
2606  *
2607  * Also handles the '%0nd' format where 'n' is the total number
2608  * of digits and '%%'.
2609  *
2610  * @param buf destination buffer
2611  * @param buf_size destination buffer size
2612  * @param path numbered sequence string
2613  * @param number frame number
2614  * @return 0 if OK, -1 on format error
2615  */
2616 int av_get_frame_filename(char *buf, int buf_size,
2617  const char *path, int number);
2618 
2619 /**
2620  * Check whether filename actually is a numbered sequence generator.
2621  *
2622  * @param filename possible numbered sequence string
2623  * @return 1 if a valid numbered sequence string, 0 otherwise
2624  */
2625 int av_filename_number_test(const char *filename);
2626 
2627 /**
2628  * Generate an SDP for an RTP session.
2629  *
2630  * Note, this overwrites the id values of AVStreams in the muxer contexts
2631  * for getting unique dynamic payload types.
2632  *
2633  * @param ac array of AVFormatContexts describing the RTP streams. If the
2634  * array is composed by only one context, such context can contain
2635  * multiple AVStreams (one AVStream per RTP stream). Otherwise,
2636  * all the contexts in the array (an AVCodecContext per RTP stream)
2637  * must contain only one AVStream.
2638  * @param n_files number of AVCodecContexts contained in ac
2639  * @param buf buffer where the SDP will be stored (must be allocated by
2640  * the caller)
2641  * @param size the size of the buffer
2642  * @return 0 if OK, AVERROR_xxx on error
2643  */
2644 int av_sdp_create(AVFormatContext *ac[], int n_files, char *buf, int size);
2645 
2646 /**
2647  * Return a positive value if the given filename has one of the given
2648  * extensions, 0 otherwise.
2649  *
2650  * @param filename file name to check against the given extensions
2651  * @param extensions a comma-separated list of filename extensions
2652  */
2653 int av_match_ext(const char *filename, const char *extensions);
2654 
2655 /**
2656  * Test if the given container can store a codec.
2657  *
2658  * @param ofmt container to check for compatibility
2659  * @param codec_id codec to potentially store in container
2660  * @param std_compliance standards compliance level, one of FF_COMPLIANCE_*
2661  *
2662  * @return 1 if codec with ID codec_id can be stored in ofmt, 0 if it cannot.
2663  * A negative number if this information is not available.
2664  */
2666  int std_compliance);
2667 
2668 /**
2669  * @defgroup riff_fourcc RIFF FourCCs
2670  * @{
2671  * Get the tables mapping RIFF FourCCs to libavcodec AVCodecIDs. The tables are
2672  * meant to be passed to av_codec_get_id()/av_codec_get_tag() as in the
2673  * following code:
2674  * @code
2675  * uint32_t tag = MKTAG('H', '2', '6', '4');
2676  * const struct AVCodecTag *table[] = { avformat_get_riff_video_tags(), 0 };
2677  * enum AVCodecID id = av_codec_get_id(table, tag);
2678  * @endcode
2679  */
2680 /**
2681  * @return the table mapping RIFF FourCCs for video to libavcodec AVCodecID.
2682  */
2683 const struct AVCodecTag *avformat_get_riff_video_tags(void);
2684 /**
2685  * @return the table mapping RIFF FourCCs for audio to AVCodecID.
2686  */
2687 const struct AVCodecTag *avformat_get_riff_audio_tags(void);
2688 /**
2689  * @return the table mapping MOV FourCCs for video to libavcodec AVCodecID.
2690  */
2691 const struct AVCodecTag *avformat_get_mov_video_tags(void);
2692 /**
2693  * @return the table mapping MOV FourCCs for audio to AVCodecID.
2694  */
2695 const struct AVCodecTag *avformat_get_mov_audio_tags(void);
2696 
2697 /**
2698  * @}
2699  */
2700 
2701 /**
2702  * Guess the sample aspect ratio of a frame, based on both the stream and the
2703  * frame aspect ratio.
2704  *
2705  * Since the frame aspect ratio is set by the codec but the stream aspect ratio
2706  * is set by the demuxer, these two may not be equal. This function tries to
2707  * return the value that you should use if you would like to display the frame.
2708  *
2709  * Basic logic is to use the stream aspect ratio if it is set to something sane
2710  * otherwise use the frame aspect ratio. This way a container setting, which is
2711  * usually easy to modify can override the coded value in the frames.
2712  *
2713  * @param format the format context which the stream is part of
2714  * @param stream the stream which the frame is part of
2715  * @param frame the frame with the aspect ratio to be determined
2716  * @return the guessed (valid) sample_aspect_ratio, 0/1 if no idea
2717  */
2719 
2720 /**
2721  * Guess the frame rate, based on both the container and codec information.
2722  *
2723  * @param ctx the format context which the stream is part of
2724  * @param stream the stream which the frame is part of
2725  * @param frame the frame for which the frame rate should be determined, may be NULL
2726  * @return the guessed (valid) frame rate, 0/1 if no idea
2727  */
2729 
2730 /**
2731  * Check if the stream st contained in s is matched by the stream specifier
2732  * spec.
2733  *
2734  * See the "stream specifiers" chapter in the documentation for the syntax
2735  * of spec.
2736  *
2737  * @return >0 if st is matched by spec;
2738  * 0 if st is not matched by spec;
2739  * AVERROR code if spec is invalid
2740  *
2741  * @note A stream specifier can match several streams in the format.
2742  */
2744  const char *spec);
2745 
2747 
2748 
2749 /**
2750  * @}
2751  */
2752 
2753 #endif /* AVFORMAT_AVFORMAT_H */
unsigned int nb_chapters
Number of chapters in AVChapter array.
Definition: avformat.h:1471
unsigned int max_index_size
Maximum amount of memory in bytes to use for the index of each stream.
Definition: avformat.h:1452
void av_url_split(char *proto, int proto_size, char *authorization, int authorization_size, char *hostname, int hostname_size, int *port_ptr, char *path, int path_size, const char *url)
Split a URL string into components.
Definition: utils.c:3886
int64_t interleaver_chunk_size
Definition: avformat.h:1071
unsigned int packet_size
Definition: avformat.h:1376
int64_t first_dts
Timestamp corresponding to the last dts sync point.
Definition: avformat.h:1018
full parsing and interpolation of timestamps for frames not starting on a packet boundary ...
Definition: avformat.h:776
const char const char void * val
Definition: avisynth_c.h:634
int64_t duration_gcd
Definition: avformat.h:982
int audio_preload
Audio preload in microseconds.
Definition: avformat.h:1590
const char * s
Definition: avisynth_c.h:631
Bytestream IO Context.
Definition: avio.h:111
void av_pkt_dump2(FILE *f, const AVPacket *pkt, int dump_payload, const AVStream *st)
Send a nice dump of a packet to the specified file stream.
Definition: dump.c:106
AVProbeData probe_data
Definition: avformat.h:1042
Buffered I/O operations.
AVPacketSideDataType
Definition: avcodec.h:977
int64_t start_time_realtime
Start time of the stream in real world time, in microseconds since the Unix epoch (00:00 1st January ...
Definition: avformat.h:1495
attribute_deprecated int av_demuxer_open(AVFormatContext *ic)
Definition: utils.c:309
char * recommended_encoder_configuration
String containing paris of key and values describing recommended encoder configuration.
Definition: avformat.h:1174
This structure describes decoded (raw) audio or video data.
Definition: frame.h:171
int64_t(* read_timestamp)(struct AVFormatContext *s, int stream_index, int64_t *pos, int64_t pos_limit)
Get the next timestamp in stream[stream_index].time_base units.
Definition: avformat.h:727
AVCodec * av_format_get_video_codec(const AVFormatContext *s)
int av_interleaved_write_frame(AVFormatContext *s, AVPacket *pkt)
Write a packet to an output media file ensuring correct interleaving.
Definition: mux.c:913
AVIOInterruptCB interrupt_callback
Custom interrupt callbacks for the I/O layer.
Definition: avformat.h:1520
ptrdiff_t const GLvoid * data
Definition: opengl_enc.c:101
int av_add_index_entry(AVStream *st, int64_t pos, int64_t timestamp, int size, int distance, int flags)
Add an index entry into a sorted list.
Definition: utils.c:1742
int flush_packets
Flush the I/O context after each packet.
Definition: avformat.h:1657
enum AVCodecID id
Definition: mxfenc.c:99
int avformat_write_header(AVFormatContext *s, AVDictionary **options)
Allocate the stream private data and write the stream header to an output media file.
Definition: mux.c:428
int av_write_frame(AVFormatContext *s, AVPacket *pkt)
Write a packet to an output media file.
Definition: mux.c:672
const char * fmt
Definition: avisynth_c.h:632
enum AVDurationEstimationMethod duration_estimation_method
The duration field can be estimated through various ways, and this field can be used to know how the ...
Definition: avformat.h:1629
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: avformat.h:1100
const char * filename
Definition: avformat.h:449
int avformat_open_input(AVFormatContext **ps, const char *filename, AVInputFormat *fmt, AVDictionary **options)
Open an input stream and read the header.
Definition: utils.c:402
int64_t pts_buffer[MAX_REORDER_DELAY+1]
Definition: avformat.h:1044
unsigned int max_picture_buffer
Maximum amount of memory in bytes to use for buffering frames obtained from realtime capture devices...
Definition: avformat.h:1458
int64_t pos
Definition: avformat.h:784
int probe_packets
Definition: avformat.h:1027
int event_flags
Flags for the user to detect events happening on the stream.
Definition: avformat.h:965
int av_probe_input_buffer2(AVIOContext *pb, AVInputFormat **fmt, const char *filename, void *logctx, unsigned int offset, unsigned int max_probe_size)
Probe a bytestream to determine the input format.
Definition: format.c:241
AVRational av_guess_sample_aspect_ratio(AVFormatContext *format, AVStream *stream, AVFrame *frame)
Guess the sample aspect ratio of a frame, based on both the stream and the frame aspect ratio...
Definition: utils.c:4188
enum AVCodecID video_codec
default video codec
Definition: avformat.h:524
int64_t first_discard_sample
If not 0, the first audio sample that should be discarded from the stream.
Definition: avformat.h:1108
void av_stream_set_r_frame_rate(AVStream *s, AVRational r)
int64_t pts_wrap_reference
Internal data to check for wrapping of the time stamp.
Definition: avformat.h:1132
AVRational sample_aspect_ratio
sample aspect ratio (0 if unknown)
Definition: avformat.h:914
uint8_t * dump_separator
dump format separator.
Definition: avformat.h:1787
int index
stream index in AVFormatContext
Definition: avformat.h:843
int avio_flags
avio flags, used to force AVIO_FLAG_DIRECT.
Definition: avformat.h:1621
AVIndexEntry * index_entries
Only used if the format does not support seeking natively.
Definition: avformat.h:1046
int(* free_device_capabilities)(struct AVFormatContext *s, struct AVDeviceCapabilitiesQuery *caps)
Free device capabilities submodule.
Definition: avformat.h:612
uint8_t * av_stream_get_side_data(AVStream *stream, enum AVPacketSideDataType type, int *size)
Get side information from stream.
Definition: utils.c:4476
int event_flags
Flags for the user to detect events happening on the file.
Definition: avformat.h:1557
int av_get_output_timestamp(struct AVFormatContext *s, int stream, int64_t *dts, int64_t *wall)
Get timing information for the data currently output.
Definition: mux.c:1013
void * priv_data
Definition: avformat.h:862
AVInputFormat * av_probe_input_format3(AVProbeData *pd, int is_opened, int *score_ret)
Guess the file format.
Definition: format.c:169
int(* write_packet)(struct AVFormatContext *, AVPacket *pkt)
Write a packet.
Definition: avformat.h:564
AVPacketSideData * side_data
An array of side data that applies to the whole stream (i.e.
Definition: avformat.h:954
static AVPacket pkt
int av_write_uncoded_frame_query(AVFormatContext *s, int stream_index)
Test whether a muxer supports uncoded frame.
Definition: mux.c:1089
int priv_data_size
Size of private data so that it can be allocated in the wrapper.
Definition: avformat.h:679
int ctx_flags
Flags signalling stream properties.
Definition: avformat.h:1321
AVDictionary * metadata
Definition: avformat.h:1239
enum AVCodecID subtitle_codec_id
Forced subtitle codec_id.
Definition: avformat.h:1440
AVCodec.
Definition: avcodec.h:3181
int strict_std_compliance
Allow non-standard and experimental extension.
Definition: avformat.h:1550
void av_format_set_subtitle_codec(AVFormatContext *s, AVCodec *c)
enum AVDurationEstimationMethod av_fmt_ctx_get_duration_estimation_method(const AVFormatContext *ctx)
Returns the method used to set ctx->duration.
Definition: options.c:125
int(* open_cb)(struct AVFormatContext *s, AVIOContext **p, const char *url, int flags, const AVIOInterruptCB *int_cb, AVDictionary **options)
Called to open further IO contexts when needed for demuxing.
Definition: avformat.h:1810
int64_t last_dts_for_order_check
Internal data to analyze DTS and detect faulty mpeg streams.
Definition: avformat.h:1160
Format I/O context.
Definition: avformat.h:1272
int64_t output_ts_offset
Output timestamp offset, in microseconds.
Definition: avformat.h:1760
AVRational av_guess_frame_rate(AVFormatContext *ctx, AVStream *stream, AVFrame *frame)
Guess the frame rate, based on both the container and codec information.
Definition: utils.c:4211
unsigned int nb_stream_indexes
Definition: avformat.h:1210
int64_t cur_dts
Definition: avformat.h:1019
const struct AVCodecTag * avformat_get_mov_audio_tags(void)
Definition: isom.c:594
Public dictionary API.
int flags
Definition: avformat.h:1207
int(* read_close)(struct AVFormatContext *)
Close the stream.
Definition: avformat.h:710
int flags
can use flags: AVFMT_NOFILE, AVFMT_NEEDNUMBER, AVFMT_RAWPICTURE, AVFMT_GLOBALHEADER, AVFMT_NOTIMESTAMPS, AVFMT_VARIABLE_FPS, AVFMT_NODIMENSIONS, AVFMT_NOSTREAMS, AVFMT_ALLOW_FLUSH, AVFMT_TS_NONSTRICT
Definition: avformat.h:532
uint8_t
int stream_identifier
Stream Identifier This is the MPEG-TS stream identifier +1 0 means unknown.
Definition: avformat.h:1069
const struct AVCodecTag * avformat_get_riff_video_tags(void)
Definition: riff.c:470
int flags
Can use flags: AVFMT_NOFILE, AVFMT_NEEDNUMBER, AVFMT_SHOW_IDS, AVFMT_GENERIC_INDEX, AVFMT_TS_DISCONT, AVFMT_NOBINSEARCH, AVFMT_NOGENSEARCH, AVFMT_NO_BYTE_SEEK, AVFMT_SEEK_TO_PTS.
Definition: avformat.h:642
enum AVCodecID av_codec_get_id(const struct AVCodecTag *const *tags, unsigned int tag)
Get the AVCodecID for the given codec tag tag.
unsigned avformat_version(void)
Return the LIBAVFORMAT_VERSION_INT constant.
Definition: utils.c:62
const char * avformat_license(void)
Return the libavformat license.
Definition: utils.c:73
int(* free_device_capabilities)(struct AVFormatContext *s, struct AVDeviceCapabilitiesQuery *caps)
Free device capabilities submodule.
Definition: avformat.h:766
AVPacket pkt
Definition: avformat.h:1845
int priv_data_size
size of private data so that it can be allocated in the wrapper
Definition: avformat.h:554
int id
unique ID to identify the chapter
Definition: avformat.h:1236
enum AVStreamParseType need_parsing
Definition: avformat.h:1035
int id
Format-specific stream ID.
Definition: avformat.h:849
struct AVStream::@141 * info
int avformat_match_stream_specifier(AVFormatContext *s, AVStream *st, const char *spec)
Check if the stream st contained in s is matched by the stream specifier spec.
Definition: utils.c:4232
int duration_count
Definition: avformat.h:983
int nb_side_data
The number of elements in the AVStream.side_data array.
Definition: avformat.h:958
AVDurationEstimationMethod
The duration of a video can be estimated through various ways, and this enum can be used to know how ...
Definition: avformat.h:1256
AVStream * avformat_new_stream(AVFormatContext *s, const AVCodec *c)
Add a new stream to a media file.
Definition: utils.c:3672
int pmt_pid
Definition: avformat.h:1214
AVStream ** streams
A list of all streams in the file.
Definition: avformat.h:1340
int av_codec_get_tag2(const struct AVCodecTag *const *tags, enum AVCodecID id, unsigned int *tag)
Get the codec tag for the given codec id.
static AVFrame * frame
AVFormatContext * avformat_alloc_context(void)
Allocate an AVFormatContext.
Definition: options.c:107
int inject_global_side_data
Internal data to inject global side data.
Definition: avformat.h:1167
void av_pkt_dump_log2(void *avcl, int level, const AVPacket *pkt, int dump_payload, const AVStream *st)
Send a nice dump of a packet to the log.
Definition: dump.c:111
const char * avformat_configuration(void)
Return the libavformat build-time configuration.
Definition: utils.c:68
#define MAX_REORDER_DELAY
Definition: avformat.h:1043
const AVClass * priv_class
AVClass for the private context.
Definition: avformat.h:653
int64_t last_duration
Definition: avformat.h:996
int flags
Flags modifying the (de)muxer behaviour.
Definition: avformat.h:1383
AVProgram * av_new_program(AVFormatContext *s, int id)
Definition: utils.c:3740
int(* read_header)(struct AVFormatContext *)
Read the format header and initialize the AVFormatContext structure.
Definition: avformat.h:693
int64_t max_interleave_delta
Maximum buffering duration for interleaving.
Definition: avformat.h:1544
int64_t probesize2
Maximum size of the data read from input for determining the input container format.
Definition: avformat.h:1777
uint32_t tag
Definition: movenc.c:1333
int avformat_network_init(void)
Do global initialization of network components.
Definition: utils.c:4123
const struct AVCodecTag * avformat_get_riff_audio_tags(void)
Definition: riff.c:475
int fps_probe_size
The number of frames used for determining the framerate in avformat_find_stream_info().
Definition: avformat.h:1502
int av_sdp_create(AVFormatContext *ac[], int n_files, char *buf, int size)
Generate an SDP for an RTP session.
Definition: sdp.c:819
int av_get_packet(AVIOContext *s, AVPacket *pkt, int size)
Allocate and read the payload of a packet and initialize its fields with default values.
Definition: utils.c:241
int av_match_ext(const char *filename, const char *extensions)
Return a positive value if the given filename has one of the given extensions, 0 otherwise.
Definition: format.c:81
const AVClass * avformat_get_class(void)
Get the AVClass for AVFormatContext.
Definition: options.c:130
ptrdiff_t size
Definition: opengl_enc.c:101
enum AVDiscard discard
selects which program to discard and which to feed to the caller
Definition: avformat.h:1208
const OptionDef options[]
Definition: ffserver.c:3798
unsigned int * stream_index
Definition: avformat.h:1209
AVCodec * av_format_get_audio_codec(const AVFormatContext *s)
enum AVCodecID video_codec_id
Forced video codec_id.
Definition: avformat.h:1428
full parsing and repack with timestamp and position generation by parser for raw this assumes that ea...
Definition: avformat.h:778
int64_t rfps_duration_sum
Definition: avformat.h:984
Duration estimated from bitrate (less accurate)
Definition: avformat.h:1259
int av_append_packet(AVIOContext *s, AVPacket *pkt, int size)
Read data and append it to the current content of the AVPacket.
Definition: utils.c:251
unsigned int correct_ts_overflow
Correct single timestamp overflows.
Definition: avformat.h:1643
struct AVOutputFormat * oformat
The output container format.
Definition: avformat.h:1291
int64_t start_time
Definition: avformat.h:1224
const struct AVCodecTag * avformat_get_mov_video_tags(void)
Definition: isom.c:589
int avformat_alloc_output_context2(AVFormatContext **ctx, AVOutputFormat *oformat, const char *format_name, const char *filename)
Allocate an AVFormatContext for an output format.
Definition: mux.c:148
void av_dump_format(AVFormatContext *ic, int index, const char *url, int is_output)
Print detailed information about the input or output format, such as duration, bitrate, streams, container, programs, metadata, side data, codec and time base.
Definition: dump.c:477
Callback for checking whether to abort blocking functions.
Definition: avio.h:50
int av_find_best_stream(AVFormatContext *ic, enum AVMediaType type, int wanted_stream_nb, int related_stream, AVCodec **decoder_ret, int flags)
Find the "best" stream in the file.
Definition: utils.c:3496
int(* write_uncoded_frame)(struct AVFormatContext *, int stream_index, AVFrame **frame, unsigned flags)
Write an uncoded AVFrame.
Definition: avformat.h:596
AVProgram * av_find_program_from_stream(AVFormatContext *ic, AVProgram *last, int s)
Find the programs which belong to a given stream.
Definition: utils.c:3479
int max_ts_probe
Maximum number of packets to read while waiting for the first timestamp.
Definition: avformat.h:1564
int format_probesize
number of bytes to read maximally to identify format.
Definition: avformat.h:1673
AVCodecID
Identify the syntax and semantics of the bitstream.
Definition: avcodec.h:102
AVDictionary * metadata
Metadata that applies to the whole file.
Definition: avformat.h:1482
int nb_decoded_frames
Number of internally decoded frames, used internally in libavformat, do not access its lifetime diffe...
Definition: avformat.h:1121
int av_index_search_timestamp(AVStream *st, int64_t timestamp, int flags)
Get the index for a specific timestamp.
Definition: utils.c:1784
const AVIOInterruptCB int_cb
Definition: ffmpeg.c:424
int(* read_probe)(AVProbeData *)
Tell if a given file has a chance of being parsed as this format.
Definition: avformat.h:686
void av_hex_dump(FILE *f, const uint8_t *buf, int size)
Send a nice hexadecimal dump of a buffer to the specified file stream.
Definition: dump.c:72
int64_t pts_wrap_reference
reference dts for wrap detection
Definition: avformat.h:1227
const char * long_name
Descriptive name for the format, meant to be more human-readable than name.
Definition: avformat.h:519
int64_t timestamp
Timestamp in AVStream.time_base units, preferably the time from which on correctly decoded frames are...
Definition: avformat.h:785
void av_format_set_data_codec(AVFormatContext *s, AVCodec *c)
int(* query_codec)(enum AVCodecID id, int std_compliance)
Test if the given codec can be stored in this container.
Definition: avformat.h:578
AVCodec * av_format_get_subtitle_codec(const AVFormatContext *s)
int(* write_header)(struct AVFormatContext *)
Definition: avformat.h:556
const char * r
Definition: vf_curves.c:107
struct AVCodecParserContext * av_stream_get_parser(const AVStream *s)
Definition: utils.c:122
unsigned int nb_programs
Definition: avformat.h:1421
int last_IP_duration
Definition: avformat.h:1021
int av_read_play(AVFormatContext *s)
Start playing a network-based stream (e.g.
Definition: utils.c:3562
AVChapter ** chapters
Definition: avformat.h:1472
int skip_samples
Number of samples to skip at the start of the frame decoded from the next packet. ...
Definition: avformat.h:1091
enum AVCodecID codec_id
Definition: mov_chan.c:433
static const uint8_t offset[127][2]
Definition: vf_spp.c:92
AVRational avg_frame_rate
Average framerate.
Definition: avformat.h:925
New fields can be added to the end with minor version bumps.
Definition: avformat.h:1205
Libavcodec external API header.
AVInputFormat * av_probe_input_format2(AVProbeData *pd, int is_opened, int *score_max)
Guess the file format.
Definition: format.c:224
int min_distance
Minimum distance between this and the previous keyframe, used to avoid unneeded searching.
Definition: avformat.h:794
int program_num
Definition: avformat.h:1213
AVCodec * audio_codec
Forced audio codec.
Definition: avformat.h:1719
void * opaque
User data.
Definition: avformat.h:1749
Only parse headers, do not repack.
Definition: avformat.h:775
char * format_whitelist
',' separated list of allowed demuxers.
Definition: avformat.h:1689
AVCodecContext * codec
Codec context associated with this stream.
Definition: avformat.h:861
int avformat_query_codec(const AVOutputFormat *ofmt, enum AVCodecID codec_id, int std_compliance)
Test if the given container can store a codec.
Definition: utils.c:4106
static float distance(float x, float y, int band)
const char * mime_type
mime_type, when known.
Definition: avformat.h:452
int buf_size
Size of buf except extra allocated bytes.
Definition: avformat.h:451
unsigned char * buf
Buffer must have AVPROBE_PADDING_SIZE of extra allocated bytes filled with zero.
Definition: avformat.h:450
void av_format_inject_global_side_data(AVFormatContext *s)
This function will cause global side data to be injected in the next packet of each stream as well as...
Definition: utils.c:127
unsigned int nb_streams
Number of elements in AVFormatContext.streams.
Definition: avformat.h:1328
void av_stream_set_recommended_encoder_configuration(AVStream *s, char *configuration)
int64_t fps_first_dts
Those are used for average framerate estimation.
Definition: avformat.h:1001
int av_read_pause(AVFormatContext *s)
Pause a network-based stream (e.g.
Definition: utils.c:3571
AVInputFormat * av_find_input_format(const char *short_name)
Find AVInputFormat based on the short name of the input format.
Definition: format.c:160
static void callback(void *priv_data, int index, uint8_t *buf, int buf_size, int64_t time, enum dshowDeviceType devtype)
Definition: dshow.c:161
char filename[1024]
input or output filename
Definition: avformat.h:1348
int update_initial_durations_done
Internal data to prevent doing update_initial_durations() twice.
Definition: avformat.h:1149
enum AVCodecID audio_codec_id
Forced audio codec_id.
Definition: avformat.h:1434
enum AVCodecID av_guess_codec(AVOutputFormat *fmt, const char *short_name, const char *filename, const char *mime_type, enum AVMediaType type)
Guess the codec ID based upon muxer and filename.
Definition: format.c:129
typedef void(APIENTRY *FF_PFNGLACTIVETEXTUREPROC)(GLenum texture)
int av_find_default_stream_index(AVFormatContext *s)
Definition: utils.c:1583
int av_probe_input_buffer(AVIOContext *pb, AVInputFormat **fmt, const char *filename, void *logctx, unsigned int offset, unsigned int max_probe_size)
Like av_probe_input_buffer2() but returns 0 on success.
Definition: format.c:334
void av_format_set_opaque(AVFormatContext *s, void *opaque)
const char * name
Definition: avformat.h:513
Duration estimated from a stream with a known duration.
Definition: avformat.h:1258
uint8_t dts_ordered
Definition: avformat.h:1161
int avoid_negative_ts
Avoid negative timestamps during muxing.
Definition: avformat.h:1573
int(* control_message)(struct AVFormatContext *s, int type, void *data, size_t data_size)
Allows sending messages from application to device.
Definition: avformat.h:585
AVDictionary * metadata
Definition: avformat.h:916
AVOutputFormat * av_guess_format(const char *short_name, const char *filename, const char *mime_type)
Return the output format in the list of registered output formats which best matches the provided par...
Definition: format.c:94
int probe_score
format probing score.
Definition: avformat.h:1666
void av_register_input_format(AVInputFormat *format)
Definition: format.c:61
void av_format_set_audio_codec(AVFormatContext *s, AVCodec *c)
Libavformat version macros.
int64_t skip_initial_bytes
Skip initial bytes when opening stream.
Definition: avformat.h:1636
void(* get_output_timestamp)(struct AVFormatContext *s, int stream, int64_t *dts, int64_t *wall)
Definition: avformat.h:580
int(* read_pause)(struct AVFormatContext *)
Pause playing - only meaningful if using a network-based format (RTSP).
Definition: avformat.h:740
AVOutputFormat * av_oformat_next(const AVOutputFormat *f)
If f is NULL, returns the first registered output format, if f is non-NULL, returns the next register...
Definition: format.c:53
const AVClass * priv_class
AVClass for the private context.
Definition: avformat.h:541
void * av_format_get_opaque(const AVFormatContext *s)
unsigned int probesize
Definition: avformat.h:1410
int(* get_device_list)(struct AVFormatContext *s, struct AVDeviceInfoList *device_list)
Returns device list with it properties.
Definition: avformat.h:602
int av_get_frame_filename(char *buf, int buf_size, const char *path, int number)
Return in 'buf' the path with 'd' replaced by a number.
Definition: utils.c:3831
static void flush(AVCodecContext *avctx)
Definition: aacdec.c:514
uint8_t pts_reorder_error_count[MAX_REORDER_DELAY+1]
Definition: avformat.h:1155
int ts_id
Transport stream id.
Definition: avformat.h:1582
const char * long_name
Descriptive name for the format, meant to be more human-readable than name.
Definition: avformat.h:635
int metadata_header_padding
Number of bytes to be written as padding in a metadata header.
Definition: avformat.h:1742
int av_format_get_probe_score(const AVFormatContext *s)
Definition: utils.c:170
Stream structure.
Definition: avformat.h:842
int(* create_device_capabilities)(struct AVFormatContext *s, struct AVDeviceCapabilitiesQuery *caps)
Initialize device capabilities submodule.
Definition: avformat.h:607
int64_t end
chapter start/end time in time_base units
Definition: avformat.h:1238
int avformat_queue_attached_pictures(AVFormatContext *s)
Definition: utils.c:379
void av_register_output_format(AVOutputFormat *format)
Definition: format.c:71
int avformat_network_deinit(void)
Undo the initialization done by avformat_network_init.
Definition: utils.c:4136
uint8_t dts_misordered
Definition: avformat.h:1162
int64_t pts_reorder_error[MAX_REORDER_DELAY+1]
Internal data to generate dts from pts.
Definition: avformat.h:1154
int64_t end_time
Definition: avformat.h:1225
struct AVOutputFormat * next
Definition: avformat.h:550
int(* read_seek)(struct AVFormatContext *, int stream_index, int64_t timestamp, int flags)
Seek to a given timestamp relative to the frames in stream component stream_index.
Definition: avformat.h:720
int debug
Flags to enable debugging.
Definition: avformat.h:1525
AVIOContext * pb
I/O context.
Definition: avformat.h:1314
const struct AVCodecTag *const * codec_tag
List of supported codec_id-codec_tag pairs, ordered by "better choice first".
Definition: avformat.h:538
main external API structure.
Definition: avcodec.h:1241
int io_repositioned
IO repositioned flag.
Definition: avformat.h:1703
int av_filename_number_test(const char *filename)
Check whether filename actually is a numbered sequence generator.
Definition: utils.c:258
void av_format_set_video_codec(AVFormatContext *s, AVCodec *c)
attribute_deprecated int max_analyze_duration
Definition: avformat.h:1416
uint8_t pi<< 24) CONV_FUNC_GROUP(AV_SAMPLE_FMT_FLT, float, AV_SAMPLE_FMT_U8, uint8_t,(*(constuint8_t *) pi-0x80)*(1.0f/(1<< 7))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_DBL, double, AV_SAMPLE_FMT_U8, uint8_t,(*(constuint8_t *) pi-0x80)*(1.0/(1<< 7))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_S16, int16_t,(*(constint16_t *) pi >>8)+0x80) CONV_FUNC_GROUP(AV_SAMPLE_FMT_FLT, float, AV_SAMPLE_FMT_S16, int16_t,*(constint16_t *) pi *(1.0f/(1<< 15))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_DBL, double, AV_SAMPLE_FMT_S16, int16_t,*(constint16_t *) pi *(1.0/(1<< 15))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_S32, int32_t,(*(constint32_t *) pi >>24)+0x80) CONV_FUNC_GROUP(AV_SAMPLE_FMT_FLT, float, AV_SAMPLE_FMT_S32, int32_t,*(constint32_t *) pi *(1.0f/(1U<< 31))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_DBL, double, AV_SAMPLE_FMT_S32, int32_t,*(constint32_t *) pi *(1.0/(1U<< 31))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_FLT, float, av_clip_uint8(lrintf(*(constfloat *) pi *(1<< 7))+0x80)) CONV_FUNC_GROUP(AV_SAMPLE_FMT_S16, int16_t, AV_SAMPLE_FMT_FLT, float, av_clip_int16(lrintf(*(constfloat *) pi *(1<< 15)))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_S32, int32_t, AV_SAMPLE_FMT_FLT, float, av_clipl_int32(llrintf(*(constfloat *) pi *(1U<< 31)))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_DBL, double, av_clip_uint8(lrint(*(constdouble *) pi *(1<< 7))+0x80)) CONV_FUNC_GROUP(AV_SAMPLE_FMT_S16, int16_t, AV_SAMPLE_FMT_DBL, double, av_clip_int16(lrint(*(constdouble *) pi *(1<< 15)))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_S32, int32_t, AV_SAMPLE_FMT_DBL, double, av_clipl_int32(llrint(*(constdouble *) pi *(1U<< 31))))#defineSET_CONV_FUNC_GROUP(ofmt, ifmt) staticvoidset_generic_function(AudioConvert *ac){}voidff_audio_convert_free(AudioConvert **ac){if(!*ac) return;ff_dither_free(&(*ac) ->dc);av_freep(ac);}AudioConvert *ff_audio_convert_alloc(AVAudioResampleContext *avr, enumAVSampleFormatout_fmt, enumAVSampleFormatin_fmt, intchannels, intsample_rate, intapply_map){AudioConvert *ac;intin_planar, out_planar;ac=av_mallocz(sizeof(*ac));if(!ac) returnNULL;ac->avr=avr;ac->out_fmt=out_fmt;ac->in_fmt=in_fmt;ac->channels=channels;ac->apply_map=apply_map;if(avr->dither_method!=AV_RESAMPLE_DITHER_NONE &&av_get_packed_sample_fmt(out_fmt)==AV_SAMPLE_FMT_S16 &&av_get_bytes_per_sample(in_fmt)>2){ac->dc=ff_dither_alloc(avr, out_fmt, in_fmt, channels, sample_rate, apply_map);if(!ac->dc){av_free(ac);returnNULL;}returnac;}in_planar=ff_sample_fmt_is_planar(in_fmt, channels);out_planar=ff_sample_fmt_is_planar(out_fmt, channels);if(in_planar==out_planar){ac->func_type=CONV_FUNC_TYPE_FLAT;ac->planes=in_planar?ac->channels:1;}elseif(in_planar) ac->func_type=CONV_FUNC_TYPE_INTERLEAVE;elseac->func_type=CONV_FUNC_TYPE_DEINTERLEAVE;set_generic_function(ac);if(ARCH_AARCH64) ff_audio_convert_init_aarch64(ac);if(ARCH_ARM) ff_audio_convert_init_arm(ac);if(ARCH_X86) ff_audio_convert_init_x86(ac);returnac;}intff_audio_convert(AudioConvert *ac, AudioData *out, AudioData *in){intuse_generic=1;intlen=in->nb_samples;intp;if(ac->dc){av_log(ac->avr, AV_LOG_TRACE,"%dsamples-audio_convert:%sto%s(dithered)\n", len, av_get_sample_fmt_name(ac->in_fmt), av_get_sample_fmt_name(ac->out_fmt));returnff_convert_dither(ac-> in
int(* read_packet)(struct AVFormatContext *, AVPacket *pkt)
Read one packet and put it in 'pkt'.
Definition: avformat.h:704
int pts_wrap_behavior
behavior on wrap detection
Definition: avformat.h:1228
void * buf
Definition: avisynth_c.h:553
double(* duration_error)[2][MAX_STD_TIMEBASES]
Definition: avformat.h:985
GLint GLenum type
Definition: opengl_enc.c:105
int nb_index_entries
Definition: avformat.h:1048
Describe the class of an AVClass context structure.
Definition: log.h:67
int index
Definition: gxfenc.c:89
int(* create_device_capabilities)(struct AVFormatContext *s, struct AVDeviceCapabilitiesQuery *caps)
Initialize device capabilities submodule.
Definition: avformat.h:760
enum AVCodecID subtitle_codec
default subtitle codec
Definition: avformat.h:525
rational number numerator/denominator
Definition: rational.h:43
int64_t last_dts
Definition: avformat.h:981
AVRational display_aspect_ratio
display aspect ratio (0 if unknown)
Definition: avformat.h:1181
AVRational av_stream_get_r_frame_rate(const AVStream *s)
const AVClass * av_class
A class for logging and AVOptions.
Definition: avformat.h:1277
AVMediaType
Definition: avutil.h:192
int(* interleave_packet)(struct AVFormatContext *, AVPacket *out, AVPacket *in, int flush)
Currently only used to set pixel format if not YUV420P.
Definition: avformat.h:569
void av_format_set_open_cb(AVFormatContext *s, AVOpenCallback callback)
int64_t fps_last_dts
Definition: avformat.h:1003
int found_decoder
0 -> decoder has not been searched for yet.
Definition: avformat.h:994
void avformat_free_context(AVFormatContext *s)
Free an AVFormatContext and all its streams.
Definition: utils.c:3609
This structure contains the data a format has to probe a file.
Definition: avformat.h:448
int av_read_frame(AVFormatContext *s, AVPacket *pkt)
Return the next frame of a stream.
Definition: utils.c:1475
List of devices.
Definition: avdevice.h:459
int avformat_seek_file(AVFormatContext *s, int stream_index, int64_t min_ts, int64_t ts, int64_t max_ts, int flags)
Seek to timestamp ts.
Definition: utils.c:2162
int seek2any
Force seeking to any (also non key) frames.
Definition: avformat.h:1650
full parsing and repack of the first frame only, only implemented for H.264 currently ...
Definition: avformat.h:777
int raw_codec_id
Raw demuxers store their codec ID here.
Definition: avformat.h:674
AVDictionary * metadata
Definition: avformat.h:1211
int64_t codec_info_duration
Definition: avformat.h:986
static int64_t pts
Global timestamp for the audio frames.
int fps_first_dts_idx
Definition: avformat.h:1002
static int flags
Definition: cpu.c:47
av_format_control_message av_format_get_control_message_cb(const AVFormatContext *s)
int64_t start_time
Position of the first frame of the component, in AV_TIME_BASE fractional seconds. ...
Definition: avformat.h:1357
const char * mime_type
Comma-separated list of mime types.
Definition: avformat.h:660
uint8_t level
Definition: svq3.c:150
#define attribute_deprecated
Definition: attributes.h:86
Duration accurately estimated from PTSes.
Definition: avformat.h:1257
int av_seek_frame(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
Seek to the keyframe at timestamp.
Definition: utils.c:2139
int64_t start
Definition: avformat.h:1238
int64_t duration
Decoding: duration of the stream, in stream time base.
Definition: avformat.h:901
int64_t interleaver_chunk_duration
Definition: avformat.h:1072
const char * extensions
If extensions are defined, then no probe is done.
Definition: avformat.h:649
AVOpenCallback av_format_get_open_cb(const AVFormatContext *s)
const uint8_t * key
Definition: avformat.h:1418
full parsing and repack
Definition: avformat.h:774
int av_interleaved_write_uncoded_frame(AVFormatContext *s, int stream_index, AVFrame *frame)
Write a uncoded frame to an output media file.
Definition: mux.c:1083
struct AVPacketList * next
Definition: avformat.h:1846
int pts_wrap_behavior
Options for behavior, when a wrap is detected.
Definition: avformat.h:1144
int(* read_play)(struct AVFormatContext *)
Start/resume playing - only meaningful if using a network-based format (RTSP).
Definition: avformat.h:734
enum AVCodecID data_codec
default data codec
Definition: avformat.h:613
int avformat_find_stream_info(AVFormatContext *ic, AVDictionary **options)
Read packets of a media file to get stream information.
Definition: utils.c:3024
int64_t start_time
Decoding: pts of the first frame of the stream in presentation order, in stream time base...
Definition: avformat.h:894
AVCodec * video_codec
Forced video codec.
Definition: avformat.h:1711
static double c[64]
int max_chunk_size
Max chunk size in bytes Note, not all formats support this and unpredictable things may happen if it ...
Definition: avformat.h:1606
int error_recognition
Error recognition; higher values will detect more errors but may misdetect some more or less valid pa...
Definition: avformat.h:1509
int disposition
AV_DISPOSITION_* bit field.
Definition: avformat.h:905
AVStreamParseType
Definition: avformat.h:772
int(* av_format_control_message)(struct AVFormatContext *s, int type, void *data, size_t data_size)
Callback used by devices to communicate with application.
Definition: avformat.h:1246
int pts_wrap_bits
number of bits in pts (used for wrapping control)
Definition: avformat.h:1008
AVRational time_base
time base in which the start/end timestamps are specified
Definition: avformat.h:1237
av_format_control_message control_message_cb
Callback used by devices to communicate with application.
Definition: avformat.h:1754
int64_t nb_frames
number of frames in this stream if known or 0
Definition: avformat.h:903
struct AVInputFormat * iformat
The input container format.
Definition: avformat.h:1284
int64_t max_analyze_duration2
Maximum duration (in AV_TIME_BASE units) of the data read from input in avformat_find_stream_info().
Definition: avformat.h:1769
void avformat_close_input(AVFormatContext **s)
Close an opened input AVFormatContext.
Definition: utils.c:3644
int av_write_uncoded_frame(AVFormatContext *s, int stream_index, AVFrame *frame)
Write a uncoded frame to an output media file.
Definition: mux.c:1077
int64_t codec_info_duration_fields
Definition: avformat.h:987
unsigned int index_entries_allocated_size
Definition: avformat.h:1049
int64_t mux_ts_offset
Timestamp offset added to timestamps before muxing NOT PART OF PUBLIC API.
Definition: avformat.h:1127
int skip_to_keyframe
Indicates that everything up to the next keyframe should be discarded.
Definition: avformat.h:1086
enum AVCodecID data_codec_id
Forced Data codec_id.
Definition: avformat.h:1793
AVCodec * subtitle_codec
Forced subtitle codec.
Definition: avformat.h:1727
int(* AVOpenCallback)(struct AVFormatContext *s, AVIOContext **pb, const char *url, int flags, const AVIOInterruptCB *int_cb, AVDictionary **options)
Definition: avformat.h:1249
AVCodec * data_codec
Forced data codec.
Definition: avformat.h:1735
enum AVCodecID audio_codec
default audio codec
Definition: avformat.h:523
char * codec_whitelist
',' separated list of allowed decoders.
Definition: avformat.h:1681
int(* get_device_list)(struct AVFormatContext *s, struct AVDeviceInfoList *device_list)
Returns device list with it properties.
Definition: avformat.h:754
int max_chunk_duration
Max chunk time in microseconds.
Definition: avformat.h:1598
struct AVCodecParserContext * parser
Definition: avformat.h:1036
void * priv_data
Format private data.
Definition: avformat.h:1300
int pcr_pid
Definition: avformat.h:1215
int codec_info_nb_frames
Number of frames that have been demuxed during av_find_stream_info()
Definition: avformat.h:1032
void av_format_set_control_message_cb(AVFormatContext *s, av_format_control_message callback)
AVDiscard
Definition: avcodec.h:660
uint8_t pi<< 24) CONV_FUNC_GROUP(AV_SAMPLE_FMT_FLT, float, AV_SAMPLE_FMT_U8, uint8_t,(*(constuint8_t *) pi-0x80)*(1.0f/(1<< 7))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_DBL, double, AV_SAMPLE_FMT_U8, uint8_t,(*(constuint8_t *) pi-0x80)*(1.0/(1<< 7))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_S16, int16_t,(*(constint16_t *) pi >>8)+0x80) CONV_FUNC_GROUP(AV_SAMPLE_FMT_FLT, float, AV_SAMPLE_FMT_S16, int16_t,*(constint16_t *) pi *(1.0f/(1<< 15))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_DBL, double, AV_SAMPLE_FMT_S16, int16_t,*(constint16_t *) pi *(1.0/(1<< 15))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_S32, int32_t,(*(constint32_t *) pi >>24)+0x80) CONV_FUNC_GROUP(AV_SAMPLE_FMT_FLT, float, AV_SAMPLE_FMT_S32, int32_t,*(constint32_t *) pi *(1.0f/(1U<< 31))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_DBL, double, AV_SAMPLE_FMT_S32, int32_t,*(constint32_t *) pi *(1.0/(1U<< 31))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_FLT, float, av_clip_uint8(lrintf(*(constfloat *) pi *(1<< 7))+0x80)) CONV_FUNC_GROUP(AV_SAMPLE_FMT_S16, int16_t, AV_SAMPLE_FMT_FLT, float, av_clip_int16(lrintf(*(constfloat *) pi *(1<< 15)))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_S32, int32_t, AV_SAMPLE_FMT_FLT, float, av_clipl_int32(llrintf(*(constfloat *) pi *(1U<< 31)))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_DBL, double, av_clip_uint8(lrint(*(constdouble *) pi *(1<< 7))+0x80)) CONV_FUNC_GROUP(AV_SAMPLE_FMT_S16, int16_t, AV_SAMPLE_FMT_DBL, double, av_clip_int16(lrint(*(constdouble *) pi *(1<< 15)))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_S32, int32_t, AV_SAMPLE_FMT_DBL, double, av_clipl_int32(llrint(*(constdouble *) pi *(1U<< 31))))#defineSET_CONV_FUNC_GROUP(ofmt, ifmt) staticvoidset_generic_function(AudioConvert *ac){}voidff_audio_convert_free(AudioConvert **ac){if(!*ac) return;ff_dither_free(&(*ac) ->dc);av_freep(ac);}AudioConvert *ff_audio_convert_alloc(AVAudioResampleContext *avr, enumAVSampleFormatout_fmt, enumAVSampleFormatin_fmt, intchannels, intsample_rate, intapply_map){AudioConvert *ac;intin_planar, out_planar;ac=av_mallocz(sizeof(*ac));if(!ac) returnNULL;ac->avr=avr;ac->out_fmt=out_fmt;ac->in_fmt=in_fmt;ac->channels=channels;ac->apply_map=apply_map;if(avr->dither_method!=AV_RESAMPLE_DITHER_NONE &&av_get_packed_sample_fmt(out_fmt)==AV_SAMPLE_FMT_S16 &&av_get_bytes_per_sample(in_fmt)>2){ac->dc=ff_dither_alloc(avr, out_fmt, in_fmt, channels, sample_rate, apply_map);if(!ac->dc){av_free(ac);returnNULL;}returnac;}in_planar=ff_sample_fmt_is_planar(in_fmt, channels);out_planar=ff_sample_fmt_is_planar(out_fmt, channels);if(in_planar==out_planar){ac->func_type=CONV_FUNC_TYPE_FLAT;ac->planes=in_planar?ac->channels:1;}elseif(in_planar) ac->func_type=CONV_FUNC_TYPE_INTERLEAVE;elseac->func_type=CONV_FUNC_TYPE_DEINTERLEAVE;set_generic_function(ac);if(ARCH_AARCH64) ff_audio_convert_init_aarch64(ac);if(ARCH_ARM) ff_audio_convert_init_arm(ac);if(ARCH_X86) ff_audio_convert_init_x86(ac);returnac;}intff_audio_convert(AudioConvert *ac, AudioData *out, AudioData *in){intuse_generic=1;intlen=in->nb_samples;intp;if(ac->dc){av_log(ac->avr, AV_LOG_TRACE,"%dsamples-audio_convert:%sto%s(dithered)\n", len, av_get_sample_fmt_name(ac->in_fmt), av_get_sample_fmt_name(ac->out_fmt));returnff_convert_dither(ac-> out
int av_format_get_metadata_header_padding(const AVFormatContext *s)
char * av_stream_get_recommended_encoder_configuration(const AVStream *s)
int av_write_trailer(AVFormatContext *s)
Write the stream trailer to an output media file and free the file private data.
Definition: mux.c:967
int bit_rate
Total stream bitrate in bit/s, 0 if not available.
Definition: avformat.h:1374
int64_t duration
Duration of the stream, in AV_TIME_BASE fractional seconds.
Definition: avformat.h:1367
int avformat_flush(AVFormatContext *s)
Discard all internally buffered data.
Definition: utils.c:2218
void av_format_set_metadata_header_padding(AVFormatContext *s, int c)
int64_t last_IP_pts
Definition: avformat.h:1020
int(* read_seek2)(struct AVFormatContext *s, int stream_index, int64_t min_ts, int64_t ts, int64_t max_ts, int flags)
Seek to timestamp ts.
Definition: avformat.h:748
const char * name
A comma separated list of short names for the format.
Definition: avformat.h:628
void av_hex_dump_log(void *avcl, int level, const uint8_t *buf, int size)
Send a nice hexadecimal dump of a buffer to the log.
Definition: dump.c:77
int fps_last_dts_idx
Definition: avformat.h:1004
AVRational time_base
This is the fundamental unit of time (in seconds) in terms of which frame timestamps are represented...
Definition: avformat.h:884
struct AVInputFormat * next
Definition: avformat.h:669
AVCodec * av_format_get_data_codec(const AVFormatContext *s)
#define MKTAG(a, b, c, d)
Definition: common.h:315
unsigned int av_codec_get_tag(const struct AVCodecTag *const *tags, enum AVCodecID id)
Get the codec tag for the given codec id id.
const char * extensions
comma-separated filename extensions
Definition: avformat.h:521
enum AVDiscard discard
Selects which packets can be discarded at will and do not need to be demuxed.
Definition: avformat.h:907
AVRational r_frame_rate
Real base framerate of the stream.
Definition: avformat.h:1062
AVInputFormat * av_probe_input_format(AVProbeData *pd, int is_opened)
Guess the file format.
Definition: format.c:235
const char * mime_type
Definition: avformat.h:520
int request_probe
stream probing state -1 -> probing finished 0 -> no probing requested rest -> perform probing with re...
Definition: avformat.h:1081
Following API allows user to probe device capabilities (supported codecs, pixel formats, sample formats, resolutions, channel counts, etc).
Definition: avdevice.h:399
int use_wallclock_as_timestamps
forces the use of wallclock timestamps as pts/dts of packets This has undefined results in the presen...
Definition: avformat.h:1614
This structure stores compressed data.
Definition: avcodec.h:1139
void av_register_all(void)
Initialize libavformat and register all the muxers, demuxers and protocols.
Definition: allformats.c:51
int(* write_trailer)(struct AVFormatContext *)
Definition: avformat.h:565
#define MAX_STD_TIMEBASES
Stream information used internally by av_find_stream_info()
Definition: avformat.h:979
const struct AVCodecTag *const * codec_tag
Definition: avformat.h:651
int64_t av_stream_get_end_pts(const AVStream *st)
Returns the pts of the last muxed packet + its duration.
Definition: utils.c:117
AVPacket attached_pic
For streams with AV_DISPOSITION_ATTACHED_PIC disposition, this packet will contain the attached pictu...
Definition: avformat.h:934
struct AVPacketList * last_in_packet_buffer
last packet in packet_buffer for this stream when muxing.
Definition: avformat.h:1041
AVInputFormat * av_iformat_next(const AVInputFormat *f)
If f is NULL, returns the first registered input format, if f is non-NULL, returns the next registere...
Definition: format.c:45
int64_t last_discard_sample
The sample after last sample that is intended to be discarded after first_discard_sample.
Definition: avformat.h:1115
AVProgram ** programs
Definition: avformat.h:1422