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avformat.h
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1 /*
2  * copyright (c) 2001 Fabrice Bellard
3  *
4  * This file is part of FFmpeg.
5  *
6  * FFmpeg is free software; you can redistribute it and/or
7  * modify it under the terms of the GNU Lesser General Public
8  * License as published by the Free Software Foundation; either
9  * version 2.1 of the License, or (at your option) any later version.
10  *
11  * FFmpeg is distributed in the hope that it will be useful,
12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14  * Lesser General Public License for more details.
15  *
16  * You should have received a copy of the GNU Lesser General Public
17  * License along with FFmpeg; if not, write to the Free Software
18  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19  */
20 
21 #ifndef AVFORMAT_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  * It is possible to configure lavf 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 makes it possible 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  */
1020  /**
1021  * Number of frames that have been demuxed during av_find_stream_info()
1022  */
1024 
1025  /* av_read_frame() support */
1027  struct AVCodecParserContext *parser;
1028 
1029  /**
1030  * last packet in packet_buffer for this stream when muxing.
1031  */
1034 #define MAX_REORDER_DELAY 16
1036 
1037  AVIndexEntry *index_entries; /**< Only used if the format does not
1038  support seeking natively. */
1039  int nb_index_entries;
1042  /**
1043  * Real base framerate of the stream.
1044  * This is the lowest framerate with which all timestamps can be
1045  * represented accurately (it is the least common multiple of all
1046  * framerates in the stream). Note, this value is just a guess!
1047  * For example, if the time base is 1/90000 and all frames have either
1048  * approximately 3600 or 1800 timer ticks, then r_frame_rate will be 50/1.
1049  *
1050  * Code outside avformat should access this field using:
1051  * av_stream_get/set_r_frame_rate(stream)
1052  */
1054 
1055  /**
1056  * Stream Identifier
1057  * This is the MPEG-TS stream identifier +1
1058  * 0 means unknown
1059  */
1060  int stream_identifier;
1062  int64_t interleaver_chunk_size;
1064 
1065  /**
1066  * stream probing state
1067  * -1 -> probing finished
1068  * 0 -> no probing requested
1069  * rest -> perform probing with request_probe being the minimum score to accept.
1070  * NOT PART OF PUBLIC API
1071  */
1072  int request_probe;
1073  /**
1074  * Indicates that everything up to the next keyframe
1075  * should be discarded.
1076  */
1077  int skip_to_keyframe;
1078 
1079  /**
1080  * Number of samples to skip at the start of the frame decoded from the next packet.
1081  */
1082  int skip_samples;
1083 
1084  /**
1085  * If not 0, the number of samples that should be skipped from the start of
1086  * the stream (the samples are removed from packets with pts==0, which also
1087  * assumes negative timestamps do not happen).
1088  * Intended for use with formats such as mp3 with ad-hoc gapless audio
1089  * support.
1090  */
1091  int64_t start_skip_samples;
1092 
1093  /**
1094  * If not 0, the first audio sample that should be discarded from the stream.
1095  * This is broken by design (needs global sample count), but can't be
1096  * avoided for broken by design formats such as mp3 with ad-hoc gapless
1097  * audio support.
1098  */
1100 
1101  /**
1102  * The sample after last sample that is intended to be discarded after
1103  * first_discard_sample. Works on frame boundaries only. Used to prevent
1104  * early EOF if the gapless info is broken (considered concatenated mp3s).
1105  */
1106  int64_t last_discard_sample;
1108  /**
1109  * Number of internally decoded frames, used internally in libavformat, do not access
1110  * its lifetime differs from info which is why it is not in that structure.
1111  */
1112  int nb_decoded_frames;
1113 
1114  /**
1115  * Timestamp offset added to timestamps before muxing
1116  * NOT PART OF PUBLIC API
1117  */
1118  int64_t mux_ts_offset;
1119 
1120  /**
1121  * Internal data to check for wrapping of the time stamp
1122  */
1123  int64_t pts_wrap_reference;
1124 
1125  /**
1126  * Options for behavior, when a wrap is detected.
1127  *
1128  * Defined by AV_PTS_WRAP_ values.
1129  *
1130  * If correction is enabled, there are two possibilities:
1131  * If the first time stamp is near the wrap point, the wrap offset
1132  * will be subtracted, which will create negative time stamps.
1133  * Otherwise the offset will be added.
1134  */
1135  int pts_wrap_behavior;
1136 
1137  /**
1138  * Internal data to prevent doing update_initial_durations() twice
1139  */
1141 
1142  /**
1143  * Internal data to generate dts from pts
1144  */
1147 
1148  /**
1149  * Internal data to analyze DTS and detect faulty mpeg streams
1150  */
1151  int64_t last_dts_for_order_check;
1155  /**
1156  * Internal data to inject global side data
1157  */
1160  /**
1161  * String containing paris of key and values describing recommended encoder configuration.
1162  * Paris are separated by ','.
1163  * Keys are separated from values by '='.
1164  */
1167  /**
1168  * display aspect ratio (0 if unknown)
1169  * - encoding: unused
1170  * - decoding: Set by libavformat to calculate sample_aspect_ratio internally
1171  */
1174  struct FFFrac *priv_pts;
1175 } AVStream;
1176 
1181 void av_stream_set_recommended_encoder_configuration(AVStream *s, char *configuration);
1183 /**
1184  * Returns the pts of the last muxed packet + its duration
1185  *
1186  * the retuned value is undefined when used with a demuxer.
1187  */
1188 int64_t av_stream_get_end_pts(const AVStream *st);
1189 
1190 #define AV_PROGRAM_RUNNING 1
1191 
1192 /**
1193  * New fields can be added to the end with minor version bumps.
1194  * Removal, reordering and changes to existing fields require a major
1195  * version bump.
1196  * sizeof(AVProgram) must not be used outside libav*.
1197  */
1198 typedef struct AVProgram {
1199  int id;
1200  int flags;
1201  enum AVDiscard discard; ///< selects which program to discard and which to feed to the caller
1202  unsigned int *stream_index;
1203  unsigned int nb_stream_indexes;
1205 
1207  int pmt_pid;
1208  int pcr_pid;
1210  /*****************************************************************
1211  * All fields below this line are not part of the public API. They
1212  * may not be used outside of libavformat and can be changed and
1213  * removed at will.
1214  * New public fields should be added right above.
1215  *****************************************************************
1216  */
1217  int64_t start_time;
1218  int64_t end_time;
1219 
1220  int64_t pts_wrap_reference; ///< reference dts for wrap detection
1221  int pts_wrap_behavior; ///< behavior on wrap detection
1222 } AVProgram;
1223 
1224 #define AVFMTCTX_NOHEADER 0x0001 /**< signal that no header is present
1225  (streams are added dynamically) */
1227 typedef struct AVChapter {
1228  int id; ///< unique ID to identify the chapter
1229  AVRational time_base; ///< time base in which the start/end timestamps are specified
1230  int64_t start, end; ///< chapter start/end time in time_base units
1233 
1234 
1235 /**
1236  * Callback used by devices to communicate with application.
1237  */
1238 typedef int (*av_format_control_message)(struct AVFormatContext *s, int type,
1239  void *data, size_t data_size);
1241 typedef int (*AVOpenCallback)(struct AVFormatContext *s, AVIOContext **pb, const char *url, int flags,
1243 
1244 /**
1245  * The duration of a video can be estimated through various ways, and this enum can be used
1246  * to know how the duration was estimated.
1247  */
1249  AVFMT_DURATION_FROM_PTS, ///< Duration accurately estimated from PTSes
1250  AVFMT_DURATION_FROM_STREAM, ///< Duration estimated from a stream with a known duration
1251  AVFMT_DURATION_FROM_BITRATE ///< Duration estimated from bitrate (less accurate)
1252 };
1253 
1254 typedef struct AVFormatInternal AVFormatInternal;
1255 
1256 /**
1257  * Format I/O context.
1258  * New fields can be added to the end with minor version bumps.
1259  * Removal, reordering and changes to existing fields require a major
1260  * version bump.
1261  * sizeof(AVFormatContext) must not be used outside libav*, use
1262  * avformat_alloc_context() to create an AVFormatContext.
1263  */
1264 typedef struct AVFormatContext {
1265  /**
1266  * A class for logging and @ref avoptions. Set by avformat_alloc_context().
1267  * Exports (de)muxer private options if they exist.
1268  */
1269  const AVClass *av_class;
1270 
1271  /**
1272  * The input container format.
1273  *
1274  * Demuxing only, set by avformat_open_input().
1275  */
1276  struct AVInputFormat *iformat;
1277 
1278  /**
1279  * The output container format.
1280  *
1281  * Muxing only, must be set by the caller before avformat_write_header().
1282  */
1283  struct AVOutputFormat *oformat;
1284 
1285  /**
1286  * Format private data. This is an AVOptions-enabled struct
1287  * if and only if iformat/oformat.priv_class is not NULL.
1288  *
1289  * - muxing: set by avformat_write_header()
1290  * - demuxing: set by avformat_open_input()
1291  */
1292  void *priv_data;
1293 
1294  /**
1295  * I/O context.
1296  *
1297  * - demuxing: either set by the user before avformat_open_input() (then
1298  * the user must close it manually) or set by avformat_open_input().
1299  * - muxing: set by the user before avformat_write_header(). The caller must
1300  * take care of closing / freeing the IO context.
1301  *
1302  * Do NOT set this field if AVFMT_NOFILE flag is set in
1303  * iformat/oformat.flags. In such a case, the (de)muxer will handle
1304  * I/O in some other way and this field will be NULL.
1305  */
1306  AVIOContext *pb;
1307 
1308  /* stream info */
1309  /**
1310  * Flags signalling stream properties. A combination of AVFMTCTX_*.
1311  * Set by libavformat.
1312  */
1313  int ctx_flags;
1314 
1315  /**
1316  * Number of elements in AVFormatContext.streams.
1317  *
1318  * Set by avformat_new_stream(), must not be modified by any other code.
1319  */
1320  unsigned int nb_streams;
1321  /**
1322  * A list of all streams in the file. New streams are created with
1323  * avformat_new_stream().
1324  *
1325  * - demuxing: streams are created by libavformat in avformat_open_input().
1326  * If AVFMTCTX_NOHEADER is set in ctx_flags, then new streams may also
1327  * appear in av_read_frame().
1328  * - muxing: streams are created by the user before avformat_write_header().
1329  *
1330  * Freed by libavformat in avformat_free_context().
1331  */
1332  AVStream **streams;
1333 
1334  /**
1335  * input or output filename
1336  *
1337  * - demuxing: set by avformat_open_input()
1338  * - muxing: may be set by the caller before avformat_write_header()
1339  */
1340  char filename[1024];
1342  /**
1343  * Position of the first frame of the component, in
1344  * AV_TIME_BASE fractional seconds. NEVER set this value directly:
1345  * It is deduced from the AVStream values.
1346  *
1347  * Demuxing only, set by libavformat.
1348  */
1349  int64_t start_time;
1350 
1351  /**
1352  * Duration of the stream, in AV_TIME_BASE fractional
1353  * seconds. Only set this value if you know none of the individual stream
1354  * durations and also do not set any of them. This is deduced from the
1355  * AVStream values if not set.
1356  *
1357  * Demuxing only, set by libavformat.
1358  */
1359  int64_t duration;
1360 
1361  /**
1362  * Total stream bitrate in bit/s, 0 if not
1363  * available. Never set it directly if the file_size and the
1364  * duration are known as FFmpeg can compute it automatically.
1365  */
1366  int bit_rate;
1367 
1368  unsigned int packet_size;
1369  int max_delay;
1370 
1371  /**
1372  * Flags modifying the (de)muxer behaviour. A combination of AVFMT_FLAG_*.
1373  * Set by the user before avformat_open_input() / avformat_write_header().
1374  */
1375  int flags;
1376 #define AVFMT_FLAG_GENPTS 0x0001 ///< Generate missing pts even if it requires parsing future frames.
1377 #define AVFMT_FLAG_IGNIDX 0x0002 ///< Ignore index.
1378 #define AVFMT_FLAG_NONBLOCK 0x0004 ///< Do not block when reading packets from input.
1379 #define AVFMT_FLAG_IGNDTS 0x0008 ///< Ignore DTS on frames that contain both DTS & PTS
1380 #define AVFMT_FLAG_NOFILLIN 0x0010 ///< Do not infer any values from other values, just return what is stored in the container
1381 #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
1382 #define AVFMT_FLAG_NOBUFFER 0x0040 ///< Do not buffer frames when possible
1383 #define AVFMT_FLAG_CUSTOM_IO 0x0080 ///< The caller has supplied a custom AVIOContext, don't avio_close() it.
1384 #define AVFMT_FLAG_DISCARD_CORRUPT 0x0100 ///< Discard frames marked corrupted
1385 #define AVFMT_FLAG_FLUSH_PACKETS 0x0200 ///< Flush the AVIOContext every packet.
1386 /**
1387  * When muxing, try to avoid writing any random/volatile data to the output.
1388  * This includes any random IDs, real-time timestamps/dates, muxer version, etc.
1389  *
1390  * This flag is mainly intended for testing.
1391  */
1392 #define AVFMT_FLAG_BITEXACT 0x0400
1393 #define AVFMT_FLAG_MP4A_LATM 0x8000 ///< Enable RTP MP4A-LATM payload
1394 #define AVFMT_FLAG_SORT_DTS 0x10000 ///< try to interleave outputted packets by dts (using this flag can slow demuxing down)
1395 #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)
1396 #define AVFMT_FLAG_KEEP_SIDE_DATA 0x40000 ///< Don't merge side data but keep it separate.
1397 #define AVFMT_FLAG_FAST_SEEK 0x80000 ///< Enable fast, but inaccurate seeks for some formats
1398 
1399 #if FF_API_PROBESIZE_32
1400  /**
1401  * @deprecated deprecated in favor of probesize2
1402  */
1403  unsigned int probesize;
1405  /**
1406  * @deprecated deprecated in favor of max_analyze_duration2
1407  */
1410 #endif
1411 
1412  const uint8_t *key;
1413  int keylen;
1414 
1415  unsigned int nb_programs;
1416  AVProgram **programs;
1417 
1418  /**
1419  * Forced video codec_id.
1420  * Demuxing: Set by user.
1421  */
1423 
1424  /**
1425  * Forced audio codec_id.
1426  * Demuxing: Set by user.
1427  */
1429 
1430  /**
1431  * Forced subtitle codec_id.
1432  * Demuxing: Set by user.
1433  */
1435 
1436  /**
1437  * Maximum amount of memory in bytes to use for the index of each stream.
1438  * If the index exceeds this size, entries will be discarded as
1439  * needed to maintain a smaller size. This can lead to slower or less
1440  * accurate seeking (depends on demuxer).
1441  * Demuxers for which a full in-memory index is mandatory will ignore
1442  * this.
1443  * - muxing: unused
1444  * - demuxing: set by user
1445  */
1446  unsigned int max_index_size;
1447 
1448  /**
1449  * Maximum amount of memory in bytes to use for buffering frames
1450  * obtained from realtime capture devices.
1451  */
1452  unsigned int max_picture_buffer;
1453 
1454  /**
1455  * Number of chapters in AVChapter array.
1456  * When muxing, chapters are normally written in the file header,
1457  * so nb_chapters should normally be initialized before write_header
1458  * is called. Some muxers (e.g. mov and mkv) can also write chapters
1459  * in the trailer. To write chapters in the trailer, nb_chapters
1460  * must be zero when write_header is called and non-zero when
1461  * write_trailer is called.
1462  * - muxing: set by user
1463  * - demuxing: set by libavformat
1464  */
1465  unsigned int nb_chapters;
1466  AVChapter **chapters;
1467 
1468  /**
1469  * Metadata that applies to the whole file.
1470  *
1471  * - demuxing: set by libavformat in avformat_open_input()
1472  * - muxing: may be set by the caller before avformat_write_header()
1473  *
1474  * Freed by libavformat in avformat_free_context().
1475  */
1477 
1478  /**
1479  * Start time of the stream in real world time, in microseconds
1480  * since the Unix epoch (00:00 1st January 1970). That is, pts=0 in the
1481  * stream was captured at this real world time.
1482  * - muxing: Set by the caller before avformat_write_header(). If set to
1483  * either 0 or AV_NOPTS_VALUE, then the current wall-time will
1484  * be used.
1485  * - demuxing: Set by libavformat. AV_NOPTS_VALUE if unknown. Note that
1486  * the value may become known after some number of frames
1487  * have been received.
1488  */
1489  int64_t start_time_realtime;
1490 
1491  /**
1492  * The number of frames used for determining the framerate in
1493  * avformat_find_stream_info().
1494  * Demuxing only, set by the caller before avformat_find_stream_info().
1495  */
1496  int fps_probe_size;
1497 
1498  /**
1499  * Error recognition; higher values will detect more errors but may
1500  * misdetect some more or less valid parts as errors.
1501  * Demuxing only, set by the caller before avformat_open_input().
1502  */
1503  int error_recognition;
1504 
1505  /**
1506  * Custom interrupt callbacks for the I/O layer.
1507  *
1508  * demuxing: set by the user before avformat_open_input().
1509  * muxing: set by the user before avformat_write_header()
1510  * (mainly useful for AVFMT_NOFILE formats). The callback
1511  * should also be passed to avio_open2() if it's used to
1512  * open the file.
1513  */
1515 
1516  /**
1517  * Flags to enable debugging.
1518  */
1519  int debug;
1520 #define FF_FDEBUG_TS 0x0001
1521 
1522  /**
1523  * Maximum buffering duration for interleaving.
1524  *
1525  * To ensure all the streams are interleaved correctly,
1526  * av_interleaved_write_frame() will wait until it has at least one packet
1527  * for each stream before actually writing any packets to the output file.
1528  * When some streams are "sparse" (i.e. there are large gaps between
1529  * successive packets), this can result in excessive buffering.
1530  *
1531  * This field specifies the maximum difference between the timestamps of the
1532  * first and the last packet in the muxing queue, above which libavformat
1533  * will output a packet regardless of whether it has queued a packet for all
1534  * the streams.
1535  *
1536  * Muxing only, set by the caller before avformat_write_header().
1537  */
1538  int64_t max_interleave_delta;
1539 
1540  /**
1541  * Allow non-standard and experimental extension
1542  * @see AVCodecContext.strict_std_compliance
1543  */
1545 
1546  /**
1547  * Flags for the user to detect events happening on the file. Flags must
1548  * be cleared by the user once the event has been handled.
1549  * A combination of AVFMT_EVENT_FLAG_*.
1550  */
1551  int event_flags;
1552 #define AVFMT_EVENT_FLAG_METADATA_UPDATED 0x0001 ///< The call resulted in updated metadata.
1554  /**
1555  * Maximum number of packets to read while waiting for the first timestamp.
1556  * Decoding only.
1557  */
1558  int max_ts_probe;
1559 
1560  /**
1561  * Avoid negative timestamps during muxing.
1562  * Any value of the AVFMT_AVOID_NEG_TS_* constants.
1563  * Note, this only works when using av_interleaved_write_frame. (interleave_packet_per_dts is in use)
1564  * - muxing: Set by user
1565  * - demuxing: unused
1566  */
1568 #define AVFMT_AVOID_NEG_TS_AUTO -1 ///< Enabled when required by target format
1569 #define AVFMT_AVOID_NEG_TS_MAKE_NON_NEGATIVE 1 ///< Shift timestamps so they are non negative
1570 #define AVFMT_AVOID_NEG_TS_MAKE_ZERO 2 ///< Shift timestamps so that they start at 0
1571 
1572  /**
1573  * Transport stream id.
1574  * This will be moved into demuxer private options. Thus no API/ABI compatibility
1575  */
1576  int ts_id;
1578  /**
1579  * Audio preload in microseconds.
1580  * Note, not all formats support this and unpredictable things may happen if it is used when not supported.
1581  * - encoding: Set by user via AVOptions (NO direct access)
1582  * - decoding: unused
1583  */
1584  int audio_preload;
1586  /**
1587  * Max chunk time in microseconds.
1588  * Note, not all formats support this and unpredictable things may happen if it is used when not supported.
1589  * - encoding: Set by user via AVOptions (NO direct access)
1590  * - decoding: unused
1591  */
1592  int max_chunk_duration;
1594  /**
1595  * Max chunk size in bytes
1596  * Note, not all formats support this and unpredictable things may happen if it is used when not supported.
1597  * - encoding: Set by user via AVOptions (NO direct access)
1598  * - decoding: unused
1599  */
1600  int max_chunk_size;
1602  /**
1603  * forces the use of wallclock timestamps as pts/dts of packets
1604  * This has undefined results in the presence of B frames.
1605  * - encoding: unused
1606  * - decoding: Set by user via AVOptions (NO direct access)
1607  */
1610  /**
1611  * avio flags, used to force AVIO_FLAG_DIRECT.
1612  * - encoding: unused
1613  * - decoding: Set by user via AVOptions (NO direct access)
1614  */
1615  int avio_flags;
1616 
1617  /**
1618  * The duration field can be estimated through various ways, and this field can be used
1619  * to know how the duration was estimated.
1620  * - encoding: unused
1621  * - decoding: Read by user via AVOptions (NO direct access)
1622  */
1625  /**
1626  * Skip initial bytes when opening stream
1627  * - encoding: unused
1628  * - decoding: Set by user via AVOptions (NO direct access)
1629  */
1630  int64_t skip_initial_bytes;
1631 
1632  /**
1633  * Correct single timestamp overflows
1634  * - encoding: unused
1635  * - decoding: Set by user via AVOptions (NO direct access)
1636  */
1637  unsigned int correct_ts_overflow;
1638 
1639  /**
1640  * Force seeking to any (also non key) frames.
1641  * - encoding: unused
1642  * - decoding: Set by user via AVOptions (NO direct access)
1643  */
1644  int seek2any;
1645 
1646  /**
1647  * Flush the I/O context after each packet.
1648  * - encoding: Set by user via AVOptions (NO direct access)
1649  * - decoding: unused
1650  */
1651  int flush_packets;
1652 
1653  /**
1654  * format probing score.
1655  * The maximal score is AVPROBE_SCORE_MAX, its set when the demuxer probes
1656  * the format.
1657  * - encoding: unused
1658  * - decoding: set by avformat, read by user via av_format_get_probe_score() (NO direct access)
1659  */
1661 
1662  /**
1663  * number of bytes to read maximally to identify format.
1664  * - encoding: unused
1665  * - decoding: set by user through AVOPtions (NO direct access)
1666  */
1667  int format_probesize;
1668 
1669  /**
1670  * ',' separated list of allowed decoders.
1671  * If NULL then all are allowed
1672  * - encoding: unused
1673  * - decoding: set by user through AVOptions (NO direct access)
1674  */
1675  char *codec_whitelist;
1677  /**
1678  * ',' separated list of allowed demuxers.
1679  * If NULL then all are allowed
1680  * - encoding: unused
1681  * - decoding: set by user through AVOptions (NO direct access)
1682  */
1683  char *format_whitelist;
1685  /**
1686  * An opaque field for libavformat internal usage.
1687  * Must not be accessed in any way by callers.
1688  */
1689  AVFormatInternal *internal;
1690 
1691  /**
1692  * IO repositioned flag.
1693  * This is set by avformat when the underlaying IO context read pointer
1694  * is repositioned, for example when doing byte based seeking.
1695  * Demuxers can use the flag to detect such changes.
1696  */
1697  int io_repositioned;
1699  /**
1700  * Forced video codec.
1701  * This allows forcing a specific decoder, even when there are multiple with
1702  * the same codec_id.
1703  * Demuxing: Set by user via av_format_set_video_codec (NO direct access).
1704  */
1707  /**
1708  * Forced audio codec.
1709  * This allows forcing a specific decoder, even when there are multiple with
1710  * the same codec_id.
1711  * Demuxing: Set by user via av_format_set_audio_codec (NO direct access).
1712  */
1715  /**
1716  * Forced subtitle codec.
1717  * This allows forcing a specific decoder, even when there are multiple with
1718  * the same codec_id.
1719  * Demuxing: Set by user via av_format_set_subtitle_codec (NO direct access).
1720  */
1723  /**
1724  * Forced data codec.
1725  * This allows forcing a specific decoder, even when there are multiple with
1726  * the same codec_id.
1727  * Demuxing: Set by user via av_format_set_data_codec (NO direct access).
1728  */
1731  /**
1732  * Number of bytes to be written as padding in a metadata header.
1733  * Demuxing: Unused.
1734  * Muxing: Set by user via av_format_set_metadata_header_padding.
1735  */
1737 
1738  /**
1739  * User data.
1740  * This is a place for some private data of the user.
1741  * Mostly usable with control_message_cb or any future callbacks in device's context.
1742  */
1743  void *opaque;
1744 
1745  /**
1746  * Callback used by devices to communicate with application.
1747  */
1749 
1750  /**
1751  * Output timestamp offset, in microseconds.
1752  * Muxing: set by user via AVOptions (NO direct access)
1753  */
1754  int64_t output_ts_offset;
1755 
1756  /**
1757  * Maximum duration (in AV_TIME_BASE units) of the data read
1758  * from input in avformat_find_stream_info().
1759  * Demuxing only, set by the caller before avformat_find_stream_info()
1760  * via AVOptions (NO direct access).
1761  * Can be set to 0 to let avformat choose using a heuristic.
1762  */
1763 #if FF_API_PROBESIZE_32
1764  int64_t max_analyze_duration2;
1765 #else
1766  int64_t max_analyze_duration;
1767 #endif
1768 
1769  /**
1770  * Maximum size of the data read from input for determining
1771  * the input container format.
1772  * Demuxing only, set by the caller before avformat_open_input()
1773  * via AVOptions (NO direct access).
1774  */
1775 #if FF_API_PROBESIZE_32
1776  int64_t probesize2;
1777 #else
1778  int64_t probesize;
1779 #endif
1780 
1781  /**
1782  * dump format separator.
1783  * can be ", " or "\n " or anything else
1784  * Code outside libavformat should access this field using AVOptions
1785  * (NO direct access).
1786  * - muxing: Set by user.
1787  * - demuxing: Set by user.
1788  */
1790 
1791  /**
1792  * Forced Data codec_id.
1793  * Demuxing: Set by user.
1794  */
1795  enum AVCodecID data_codec_id;
1796 
1797  /**
1798  * Called to open further IO contexts when needed for demuxing.
1799  *
1800  * This can be set by the user application to perform security checks on
1801  * the URLs before opening them.
1802  * The function should behave like avio_open2(), AVFormatContext is provided
1803  * as contextual information and to reach AVFormatContext.opaque.
1804  *
1805  * If NULL then some simple checks are used together with avio_open2().
1806  *
1807  * Must not be accessed directly from outside avformat.
1808  * @See av_format_set_open_cb()
1809  *
1810  * Demuxing: Set by user.
1811  */
1812  int (*open_cb)(struct AVFormatContext *s, AVIOContext **p, const char *url, int flags, const AVIOInterruptCB *int_cb, AVDictionary **options);
1813 } AVFormatContext;
1814 
1826 void * av_format_get_opaque(const AVFormatContext *s);
1832 
1833 /**
1834  * This function will cause global side data to be injected in the next packet
1835  * of each stream as well as after any subsequent seek.
1836  */
1838 
1839 /**
1840  * Returns the method used to set ctx->duration.
1841  *
1842  * @return AVFMT_DURATION_FROM_PTS, AVFMT_DURATION_FROM_STREAM, or AVFMT_DURATION_FROM_BITRATE.
1843  */
1845 
1846 typedef struct AVPacketList {
1847  AVPacket pkt;
1848  struct AVPacketList *next;
1849 } AVPacketList;
1850 
1851 
1852 /**
1853  * @defgroup lavf_core Core functions
1854  * @ingroup libavf
1855  *
1856  * Functions for querying libavformat capabilities, allocating core structures,
1857  * etc.
1858  * @{
1859  */
1860 
1861 /**
1862  * Return the LIBAVFORMAT_VERSION_INT constant.
1863  */
1864 unsigned avformat_version(void);
1865 
1866 /**
1867  * Return the libavformat build-time configuration.
1868  */
1869 const char *avformat_configuration(void);
1870 
1871 /**
1872  * Return the libavformat license.
1873  */
1874 const char *avformat_license(void);
1875 
1876 /**
1877  * Initialize libavformat and register all the muxers, demuxers and
1878  * protocols. If you do not call this function, then you can select
1879  * exactly which formats you want to support.
1880  *
1881  * @see av_register_input_format()
1882  * @see av_register_output_format()
1883  */
1884 void av_register_all(void);
1885 
1888 
1889 /**
1890  * Do global initialization of network components. This is optional,
1891  * but recommended, since it avoids the overhead of implicitly
1892  * doing the setup for each session.
1893  *
1894  * Calling this function will become mandatory if using network
1895  * protocols at some major version bump.
1896  */
1897 int avformat_network_init(void);
1898 
1899 /**
1900  * Undo the initialization done by avformat_network_init.
1901  */
1902 int avformat_network_deinit(void);
1903 
1904 /**
1905  * If f is NULL, returns the first registered input format,
1906  * if f is non-NULL, returns the next registered input format after f
1907  * or NULL if f is the last one.
1908  */
1910 
1911 /**
1912  * If f is NULL, returns the first registered output format,
1913  * if f is non-NULL, returns the next registered output format after f
1914  * or NULL if f is the last one.
1915  */
1917 
1918 /**
1919  * Allocate an AVFormatContext.
1920  * avformat_free_context() can be used to free the context and everything
1921  * allocated by the framework within it.
1922  */
1924 
1925 /**
1926  * Free an AVFormatContext and all its streams.
1927  * @param s context to free
1928  */
1930 
1931 /**
1932  * Get the AVClass for AVFormatContext. It can be used in combination with
1933  * AV_OPT_SEARCH_FAKE_OBJ for examining options.
1934  *
1935  * @see av_opt_find().
1936  */
1937 const AVClass *avformat_get_class(void);
1938 
1939 /**
1940  * Add a new stream to a media file.
1941  *
1942  * When demuxing, it is called by the demuxer in read_header(). If the
1943  * flag AVFMTCTX_NOHEADER is set in s.ctx_flags, then it may also
1944  * be called in read_packet().
1945  *
1946  * When muxing, should be called by the user before avformat_write_header().
1947  *
1948  * User is required to call avcodec_close() and avformat_free_context() to
1949  * clean up the allocation by avformat_new_stream().
1950  *
1951  * @param s media file handle
1952  * @param c If non-NULL, the AVCodecContext corresponding to the new stream
1953  * will be initialized to use this codec. This is needed for e.g. codec-specific
1954  * defaults to be set, so codec should be provided if it is known.
1955  *
1956  * @return newly created stream or NULL on error.
1957  */
1959 
1960 /**
1961  * Get side information from stream.
1962  *
1963  * @param stream stream
1964  * @param type desired side information type
1965  * @param size pointer for side information size to store (optional)
1966  * @return pointer to data if present or NULL otherwise
1967  */
1969  enum AVPacketSideDataType type, int *size);
1970 
1972 
1973 /**
1974  * @}
1975  */
1976 
1977 
1978 /**
1979  * Allocate an AVFormatContext for an output format.
1980  * avformat_free_context() can be used to free the context and
1981  * everything allocated by the framework within it.
1982  *
1983  * @param *ctx is set to the created format context, or to NULL in
1984  * case of failure
1985  * @param oformat format to use for allocating the context, if NULL
1986  * format_name and filename are used instead
1987  * @param format_name the name of output format to use for allocating the
1988  * context, if NULL filename is used instead
1989  * @param filename the name of the filename to use for allocating the
1990  * context, may be NULL
1991  * @return >= 0 in case of success, a negative AVERROR code in case of
1992  * failure
1993  */
1995  const char *format_name, const char *filename);
1996 
1997 /**
1998  * @addtogroup lavf_decoding
1999  * @{
2000  */
2001 
2002 /**
2003  * Find AVInputFormat based on the short name of the input format.
2004  */
2005 AVInputFormat *av_find_input_format(const char *short_name);
2006 
2007 /**
2008  * Guess the file format.
2009  *
2010  * @param pd data to be probed
2011  * @param is_opened Whether the file is already opened; determines whether
2012  * demuxers with or without AVFMT_NOFILE are probed.
2013  */
2014 AVInputFormat *av_probe_input_format(AVProbeData *pd, int is_opened);
2015 
2016 /**
2017  * Guess the file format.
2018  *
2019  * @param pd data to be probed
2020  * @param is_opened Whether the file is already opened; determines whether
2021  * demuxers with or without AVFMT_NOFILE are probed.
2022  * @param score_max A probe score larger that this is required to accept a
2023  * detection, the variable is set to the actual detection
2024  * score afterwards.
2025  * If the score is <= AVPROBE_SCORE_MAX / 4 it is recommended
2026  * to retry with a larger probe buffer.
2027  */
2028 AVInputFormat *av_probe_input_format2(AVProbeData *pd, int is_opened, int *score_max);
2029 
2030 /**
2031  * Guess the file format.
2032  *
2033  * @param is_opened Whether the file is already opened; determines whether
2034  * demuxers with or without AVFMT_NOFILE are probed.
2035  * @param score_ret The score of the best detection.
2036  */
2037 AVInputFormat *av_probe_input_format3(AVProbeData *pd, int is_opened, int *score_ret);
2038 
2039 /**
2040  * Probe a bytestream to determine the input format. Each time a probe returns
2041  * with a score that is too low, the probe buffer size is increased and another
2042  * attempt is made. When the maximum probe size is reached, the input format
2043  * with the highest score is returned.
2044  *
2045  * @param pb the bytestream to probe
2046  * @param fmt the input format is put here
2047  * @param filename the filename of the stream
2048  * @param logctx the log context
2049  * @param offset the offset within the bytestream to probe from
2050  * @param max_probe_size the maximum probe buffer size (zero for default)
2051  * @return the score in case of success, a negative value corresponding to an
2052  * the maximal score is AVPROBE_SCORE_MAX
2053  * AVERROR code otherwise
2054  */
2056  const char *filename, void *logctx,
2057  unsigned int offset, unsigned int max_probe_size);
2058 
2059 /**
2060  * Like av_probe_input_buffer2() but returns 0 on success
2061  */
2063  const char *filename, void *logctx,
2064  unsigned int offset, unsigned int max_probe_size);
2065 
2066 /**
2067  * Open an input stream and read the header. The codecs are not opened.
2068  * The stream must be closed with avformat_close_input().
2069  *
2070  * @param ps Pointer to user-supplied AVFormatContext (allocated by avformat_alloc_context).
2071  * May be a pointer to NULL, in which case an AVFormatContext is allocated by this
2072  * function and written into ps.
2073  * Note that a user-supplied AVFormatContext will be freed on failure.
2074  * @param filename Name of the stream to open.
2075  * @param fmt If non-NULL, this parameter forces a specific input format.
2076  * Otherwise the format is autodetected.
2077  * @param options A dictionary filled with AVFormatContext and demuxer-private options.
2078  * On return this parameter will be destroyed and replaced with a dict containing
2079  * options that were not found. May be NULL.
2080  *
2081  * @return 0 on success, a negative AVERROR on failure.
2082  *
2083  * @note If you want to use custom IO, preallocate the format context and set its pb field.
2084  */
2085 int avformat_open_input(AVFormatContext **ps, const char *filename, AVInputFormat *fmt, AVDictionary **options);
2086 
2089 
2090 /**
2091  * Read packets of a media file to get stream information. This
2092  * is useful for file formats with no headers such as MPEG. This
2093  * function also computes the real framerate in case of MPEG-2 repeat
2094  * frame mode.
2095  * The logical file position is not changed by this function;
2096  * examined packets may be buffered for later processing.
2097  *
2098  * @param ic media file handle
2099  * @param options If non-NULL, an ic.nb_streams long array of pointers to
2100  * dictionaries, where i-th member contains options for
2101  * codec corresponding to i-th stream.
2102  * On return each dictionary will be filled with options that were not found.
2103  * @return >=0 if OK, AVERROR_xxx on error
2104  *
2105  * @note this function isn't guaranteed to open all the codecs, so
2106  * options being non-empty at return is a perfectly normal behavior.
2107  *
2108  * @todo Let the user decide somehow what information is needed so that
2109  * we do not waste time getting stuff the user does not need.
2110  */
2112 
2113 /**
2114  * Find the programs which belong to a given stream.
2115  *
2116  * @param ic media file handle
2117  * @param last the last found program, the search will start after this
2118  * program, or from the beginning if it is NULL
2119  * @param s stream index
2120  * @return the next program which belongs to s, NULL if no program is found or
2121  * the last program is not among the programs of ic.
2122  */
2124 
2125 /**
2126  * Find the "best" stream in the file.
2127  * The best stream is determined according to various heuristics as the most
2128  * likely to be what the user expects.
2129  * If the decoder parameter is non-NULL, av_find_best_stream will find the
2130  * default decoder for the stream's codec; streams for which no decoder can
2131  * be found are ignored.
2132  *
2133  * @param ic media file handle
2134  * @param type stream type: video, audio, subtitles, etc.
2135  * @param wanted_stream_nb user-requested stream number,
2136  * or -1 for automatic selection
2137  * @param related_stream try to find a stream related (eg. in the same
2138  * program) to this one, or -1 if none
2139  * @param decoder_ret if non-NULL, returns the decoder for the
2140  * selected stream
2141  * @param flags flags; none are currently defined
2142  * @return the non-negative stream number in case of success,
2143  * AVERROR_STREAM_NOT_FOUND if no stream with the requested type
2144  * could be found,
2145  * AVERROR_DECODER_NOT_FOUND if streams were found but no decoder
2146  * @note If av_find_best_stream returns successfully and decoder_ret is not
2147  * NULL, then *decoder_ret is guaranteed to be set to a valid AVCodec.
2148  */
2150  enum AVMediaType type,
2151  int wanted_stream_nb,
2152  int related_stream,
2153  AVCodec **decoder_ret,
2154  int flags);
2155 
2156 /**
2157  * Return the next frame of a stream.
2158  * This function returns what is stored in the file, and does not validate
2159  * that what is there are valid frames for the decoder. It will split what is
2160  * stored in the file into frames and return one for each call. It will not
2161  * omit invalid data between valid frames so as to give the decoder the maximum
2162  * information possible for decoding.
2163  *
2164  * If pkt->buf is NULL, then the packet is valid until the next
2165  * av_read_frame() or until avformat_close_input(). Otherwise the packet
2166  * is valid indefinitely. In both cases the packet must be freed with
2167  * av_free_packet when it is no longer needed. For video, the packet contains
2168  * exactly one frame. For audio, it contains an integer number of frames if each
2169  * frame has a known fixed size (e.g. PCM or ADPCM data). If the audio frames
2170  * have a variable size (e.g. MPEG audio), then it contains one frame.
2171  *
2172  * pkt->pts, pkt->dts and pkt->duration are always set to correct
2173  * values in AVStream.time_base units (and guessed if the format cannot
2174  * provide them). pkt->pts can be AV_NOPTS_VALUE if the video format
2175  * has B-frames, so it is better to rely on pkt->dts if you do not
2176  * decompress the payload.
2177  *
2178  * @return 0 if OK, < 0 on error or end of file
2179  */
2181 
2182 /**
2183  * Seek to the keyframe at timestamp.
2184  * 'timestamp' in 'stream_index'.
2185  *
2186  * @param s media file handle
2187  * @param stream_index If stream_index is (-1), a default
2188  * stream is selected, and timestamp is automatically converted
2189  * from AV_TIME_BASE units to the stream specific time_base.
2190  * @param timestamp Timestamp in AVStream.time_base units
2191  * or, if no stream is specified, in AV_TIME_BASE units.
2192  * @param flags flags which select direction and seeking mode
2193  * @return >= 0 on success
2194  */
2195 int av_seek_frame(AVFormatContext *s, int stream_index, int64_t timestamp,
2196  int flags);
2197 
2198 /**
2199  * Seek to timestamp ts.
2200  * Seeking will be done so that the point from which all active streams
2201  * can be presented successfully will be closest to ts and within min/max_ts.
2202  * Active streams are all streams that have AVStream.discard < AVDISCARD_ALL.
2203  *
2204  * If flags contain AVSEEK_FLAG_BYTE, then all timestamps are in bytes and
2205  * are the file position (this may not be supported by all demuxers).
2206  * If flags contain AVSEEK_FLAG_FRAME, then all timestamps are in frames
2207  * in the stream with stream_index (this may not be supported by all demuxers).
2208  * Otherwise all timestamps are in units of the stream selected by stream_index
2209  * or if stream_index is -1, in AV_TIME_BASE units.
2210  * If flags contain AVSEEK_FLAG_ANY, then non-keyframes are treated as
2211  * keyframes (this may not be supported by all demuxers).
2212  * If flags contain AVSEEK_FLAG_BACKWARD, it is ignored.
2213  *
2214  * @param s media file handle
2215  * @param stream_index index of the stream which is used as time base reference
2216  * @param min_ts smallest acceptable timestamp
2217  * @param ts target timestamp
2218  * @param max_ts largest acceptable timestamp
2219  * @param flags flags
2220  * @return >=0 on success, error code otherwise
2221  *
2222  * @note This is part of the new seek API which is still under construction.
2223  * Thus do not use this yet. It may change at any time, do not expect
2224  * ABI compatibility yet!
2225  */
2226 int avformat_seek_file(AVFormatContext *s, int stream_index, int64_t min_ts, int64_t ts, int64_t max_ts, int flags);
2227 
2228 /**
2229  * Discard all internally buffered data. This can be useful when dealing with
2230  * discontinuities in the byte stream. Generally works only with formats that
2231  * can resync. This includes headerless formats like MPEG-TS/TS but should also
2232  * work with NUT, Ogg and in a limited way AVI for example.
2233  *
2234  * The set of streams, the detected duration, stream parameters and codecs do
2235  * not change when calling this function. If you want a complete reset, it's
2236  * better to open a new AVFormatContext.
2237  *
2238  * This does not flush the AVIOContext (s->pb). If necessary, call
2239  * avio_flush(s->pb) before calling this function.
2240  *
2241  * @param s media file handle
2242  * @return >=0 on success, error code otherwise
2243  */
2245 
2246 /**
2247  * Start playing a network-based stream (e.g. RTSP stream) at the
2248  * current position.
2249  */
2251 
2252 /**
2253  * Pause a network-based stream (e.g. RTSP stream).
2254  *
2255  * Use av_read_play() to resume it.
2256  */
2258 
2259 /**
2260  * Close an opened input AVFormatContext. Free it and all its contents
2261  * and set *s to NULL.
2262  */
2264 /**
2265  * @}
2266  */
2267 
2268 #define AVSEEK_FLAG_BACKWARD 1 ///< seek backward
2269 #define AVSEEK_FLAG_BYTE 2 ///< seeking based on position in bytes
2270 #define AVSEEK_FLAG_ANY 4 ///< seek to any frame, even non-keyframes
2271 #define AVSEEK_FLAG_FRAME 8 ///< seeking based on frame number
2272 
2273 /**
2274  * @addtogroup lavf_encoding
2275  * @{
2276  */
2277 /**
2278  * Allocate the stream private data and write the stream header to
2279  * an output media file.
2280  *
2281  * @param s Media file handle, must be allocated with avformat_alloc_context().
2282  * Its oformat field must be set to the desired output format;
2283  * Its pb field must be set to an already opened AVIOContext.
2284  * @param options An AVDictionary filled with AVFormatContext and muxer-private options.
2285  * On return this parameter will be destroyed and replaced with a dict containing
2286  * options that were not found. May be NULL.
2287  *
2288  * @return 0 on success, negative AVERROR on failure.
2289  *
2290  * @see av_opt_find, av_dict_set, avio_open, av_oformat_next.
2291  */
2293 
2294 /**
2295  * Write a packet to an output media file.
2296  *
2297  * This function passes the packet directly to the muxer, without any buffering
2298  * or reordering. The caller is responsible for correctly interleaving the
2299  * packets if the format requires it. Callers that want libavformat to handle
2300  * the interleaving should call av_interleaved_write_frame() instead of this
2301  * function.
2302  *
2303  * @param s media file handle
2304  * @param pkt The packet containing the data to be written. Note that unlike
2305  * av_interleaved_write_frame(), this function does not take
2306  * ownership of the packet passed to it (though some muxers may make
2307  * an internal reference to the input packet).
2308  * <br>
2309  * This parameter can be NULL (at any time, not just at the end), in
2310  * order to immediately flush data buffered within the muxer, for
2311  * muxers that buffer up data internally before writing it to the
2312  * output.
2313  * <br>
2314  * Packet's @ref AVPacket.stream_index "stream_index" field must be
2315  * set to the index of the corresponding stream in @ref
2316  * AVFormatContext.streams "s->streams". It is very strongly
2317  * recommended that timing information (@ref AVPacket.pts "pts", @ref
2318  * AVPacket.dts "dts", @ref AVPacket.duration "duration") is set to
2319  * correct values.
2320  * @return < 0 on error, = 0 if OK, 1 if flushed and there is no more data to flush
2321  *
2322  * @see av_interleaved_write_frame()
2323  */
2325 
2326 /**
2327  * Write a packet to an output media file ensuring correct interleaving.
2328  *
2329  * This function will buffer the packets internally as needed to make sure the
2330  * packets in the output file are properly interleaved in the order of
2331  * increasing dts. Callers doing their own interleaving should call
2332  * av_write_frame() instead of this function.
2333  *
2334  * @param s media file handle
2335  * @param pkt The packet containing the data to be written.
2336  * <br>
2337  * If the packet is reference-counted, this function will take
2338  * ownership of this reference and unreference it later when it sees
2339  * fit.
2340  * The caller must not access the data through this reference after
2341  * this function returns. If the packet is not reference-counted,
2342  * libavformat will make a copy.
2343  * <br>
2344  * This parameter can be NULL (at any time, not just at the end), to
2345  * flush the interleaving queues.
2346  * <br>
2347  * Packet's @ref AVPacket.stream_index "stream_index" field must be
2348  * set to the index of the corresponding stream in @ref
2349  * AVFormatContext.streams "s->streams". It is very strongly
2350  * recommended that timing information (@ref AVPacket.pts "pts", @ref
2351  * AVPacket.dts "dts", @ref AVPacket.duration "duration") is set to
2352  * correct values.
2353  *
2354  * @return 0 on success, a negative AVERROR on error. Libavformat will always
2355  * take care of freeing the packet, even if this function fails.
2356  *
2357  * @see av_write_frame(), AVFormatContext.max_interleave_delta
2358  */
2360 
2361 /**
2362  * Write a uncoded frame to an output media file.
2363  *
2364  * The frame must be correctly interleaved according to the container
2365  * specification; if not, then av_interleaved_write_frame() must be used.
2366  *
2367  * See av_interleaved_write_frame() for details.
2368  */
2369 int av_write_uncoded_frame(AVFormatContext *s, int stream_index,
2370  AVFrame *frame);
2371 
2372 /**
2373  * Write a uncoded frame to an output media file.
2374  *
2375  * If the muxer supports it, this function makes it possible to write an AVFrame
2376  * structure directly, without encoding it into a packet.
2377  * It is mostly useful for devices and similar special muxers that use raw
2378  * video or PCM data and will not serialize it into a byte stream.
2379  *
2380  * To test whether it is possible to use it with a given muxer and stream,
2381  * use av_write_uncoded_frame_query().
2382  *
2383  * The caller gives up ownership of the frame and must not access it
2384  * afterwards.
2385  *
2386  * @return >=0 for success, a negative code on error
2387  */
2388 int av_interleaved_write_uncoded_frame(AVFormatContext *s, int stream_index,
2389  AVFrame *frame);
2390 
2391 /**
2392  * Test whether a muxer supports uncoded frame.
2393  *
2394  * @return >=0 if an uncoded frame can be written to that muxer and stream,
2395  * <0 if not
2396  */
2397 int av_write_uncoded_frame_query(AVFormatContext *s, int stream_index);
2398 
2399 /**
2400  * Write the stream trailer to an output media file and free the
2401  * file private data.
2402  *
2403  * May only be called after a successful call to avformat_write_header.
2404  *
2405  * @param s media file handle
2406  * @return 0 if OK, AVERROR_xxx on error
2407  */
2409 
2410 /**
2411  * Return the output format in the list of registered output formats
2412  * which best matches the provided parameters, or return NULL if
2413  * there is no match.
2414  *
2415  * @param short_name if non-NULL checks if short_name matches with the
2416  * names of the registered formats
2417  * @param filename if non-NULL checks if filename terminates with the
2418  * extensions of the registered formats
2419  * @param mime_type if non-NULL checks if mime_type matches with the
2420  * MIME type of the registered formats
2421  */
2422 AVOutputFormat *av_guess_format(const char *short_name,
2423  const char *filename,
2424  const char *mime_type);
2425 
2426 /**
2427  * Guess the codec ID based upon muxer and filename.
2428  */
2429 enum AVCodecID av_guess_codec(AVOutputFormat *fmt, const char *short_name,
2430  const char *filename, const char *mime_type,
2431  enum AVMediaType type);
2432 
2433 /**
2434  * Get timing information for the data currently output.
2435  * The exact meaning of "currently output" depends on the format.
2436  * It is mostly relevant for devices that have an internal buffer and/or
2437  * work in real time.
2438  * @param s media file handle
2439  * @param stream stream in the media file
2440  * @param[out] dts DTS of the last packet output for the stream, in stream
2441  * time_base units
2442  * @param[out] wall absolute time when that packet whas output,
2443  * in microsecond
2444  * @return 0 if OK, AVERROR(ENOSYS) if the format does not support it
2445  * Note: some formats or devices may not allow to measure dts and wall
2446  * atomically.
2447  */
2448 int av_get_output_timestamp(struct AVFormatContext *s, int stream,
2449  int64_t *dts, int64_t *wall);
2450 
2451 
2452 /**
2453  * @}
2454  */
2455 
2456 
2457 /**
2458  * @defgroup lavf_misc Utility functions
2459  * @ingroup libavf
2460  * @{
2461  *
2462  * Miscellaneous utility functions related to both muxing and demuxing
2463  * (or neither).
2464  */
2465 
2466 /**
2467  * Send a nice hexadecimal dump of a buffer to the specified file stream.
2468  *
2469  * @param f The file stream pointer where the dump should be sent to.
2470  * @param buf buffer
2471  * @param size buffer size
2472  *
2473  * @see av_hex_dump_log, av_pkt_dump2, av_pkt_dump_log2
2474  */
2475 void av_hex_dump(FILE *f, const uint8_t *buf, int size);
2476 
2477 /**
2478  * Send a nice hexadecimal dump of a buffer to the log.
2479  *
2480  * @param avcl A pointer to an arbitrary struct of which the first field is a
2481  * pointer to an AVClass struct.
2482  * @param level The importance level of the message, lower values signifying
2483  * higher importance.
2484  * @param buf buffer
2485  * @param size buffer size
2486  *
2487  * @see av_hex_dump, av_pkt_dump2, av_pkt_dump_log2
2488  */
2489 void av_hex_dump_log(void *avcl, int level, const uint8_t *buf, int size);
2490 
2491 /**
2492  * Send a nice dump of a packet to the specified file stream.
2493  *
2494  * @param f The file stream pointer where the dump should be sent to.
2495  * @param pkt packet to dump
2496  * @param dump_payload True if the payload must be displayed, too.
2497  * @param st AVStream that the packet belongs to
2498  */
2499 void av_pkt_dump2(FILE *f, const AVPacket *pkt, int dump_payload, const AVStream *st);
2500 
2501 
2502 /**
2503  * Send a nice dump of a packet to the log.
2504  *
2505  * @param avcl A pointer to an arbitrary struct of which the first field is a
2506  * pointer to an AVClass struct.
2507  * @param level The importance level of the message, lower values signifying
2508  * higher importance.
2509  * @param pkt packet to dump
2510  * @param dump_payload True if the payload must be displayed, too.
2511  * @param st AVStream that the packet belongs to
2512  */
2513 void av_pkt_dump_log2(void *avcl, int level, const AVPacket *pkt, int dump_payload,
2514  const AVStream *st);
2515 
2516 /**
2517  * Get the AVCodecID for the given codec tag tag.
2518  * If no codec id is found returns AV_CODEC_ID_NONE.
2519  *
2520  * @param tags list of supported codec_id-codec_tag pairs, as stored
2521  * in AVInputFormat.codec_tag and AVOutputFormat.codec_tag
2522  * @param tag codec tag to match to a codec ID
2523  */
2524 enum AVCodecID av_codec_get_id(const struct AVCodecTag * const *tags, unsigned int tag);
2525 
2526 /**
2527  * Get the codec tag for the given codec id id.
2528  * If no codec tag is found returns 0.
2529  *
2530  * @param tags list of supported codec_id-codec_tag pairs, as stored
2531  * in AVInputFormat.codec_tag and AVOutputFormat.codec_tag
2532  * @param id codec ID to match to a codec tag
2533  */
2534 unsigned int av_codec_get_tag(const struct AVCodecTag * const *tags, enum AVCodecID id);
2535 
2536 /**
2537  * Get the codec tag for the given codec id.
2538  *
2539  * @param tags list of supported codec_id - codec_tag pairs, as stored
2540  * in AVInputFormat.codec_tag and AVOutputFormat.codec_tag
2541  * @param id codec id that should be searched for in the list
2542  * @param tag A pointer to the found tag
2543  * @return 0 if id was not found in tags, > 0 if it was found
2544  */
2545 int av_codec_get_tag2(const struct AVCodecTag * const *tags, enum AVCodecID id,
2546  unsigned int *tag);
2547 
2549 
2550 /**
2551  * Get the index for a specific timestamp.
2552  *
2553  * @param st stream that the timestamp belongs to
2554  * @param timestamp timestamp to retrieve the index for
2555  * @param flags if AVSEEK_FLAG_BACKWARD then the returned index will correspond
2556  * to the timestamp which is <= the requested one, if backward
2557  * is 0, then it will be >=
2558  * if AVSEEK_FLAG_ANY seek to any frame, only keyframes otherwise
2559  * @return < 0 if no such timestamp could be found
2560  */
2561 int av_index_search_timestamp(AVStream *st, int64_t timestamp, int flags);
2562 
2563 /**
2564  * Add an index entry into a sorted list. Update the entry if the list
2565  * already contains it.
2566  *
2567  * @param timestamp timestamp in the time base of the given stream
2568  */
2569 int av_add_index_entry(AVStream *st, int64_t pos, int64_t timestamp,
2570  int size, int distance, int flags);
2571 
2572 
2573 /**
2574  * Split a URL string into components.
2575  *
2576  * The pointers to buffers for storing individual components may be null,
2577  * in order to ignore that component. Buffers for components not found are
2578  * set to empty strings. If the port is not found, it is set to a negative
2579  * value.
2580  *
2581  * @param proto the buffer for the protocol
2582  * @param proto_size the size of the proto buffer
2583  * @param authorization the buffer for the authorization
2584  * @param authorization_size the size of the authorization buffer
2585  * @param hostname the buffer for the host name
2586  * @param hostname_size the size of the hostname buffer
2587  * @param port_ptr a pointer to store the port number in
2588  * @param path the buffer for the path
2589  * @param path_size the size of the path buffer
2590  * @param url the URL to split
2591  */
2592 void av_url_split(char *proto, int proto_size,
2593  char *authorization, int authorization_size,
2594  char *hostname, int hostname_size,
2595  int *port_ptr,
2596  char *path, int path_size,
2597  const char *url);
2598 
2599 
2600 /**
2601  * Print detailed information about the input or output format, such as
2602  * duration, bitrate, streams, container, programs, metadata, side data,
2603  * codec and time base.
2604  *
2605  * @param ic the context to analyze
2606  * @param index index of the stream to dump information about
2607  * @param url the URL to print, such as source or destination file
2608  * @param is_output Select whether the specified context is an input(0) or output(1)
2609  */
2611  int index,
2612  const char *url,
2613  int is_output);
2614 
2615 /**
2616  * Return in 'buf' the path with '%d' replaced by a number.
2617  *
2618  * Also handles the '%0nd' format where 'n' is the total number
2619  * of digits and '%%'.
2620  *
2621  * @param buf destination buffer
2622  * @param buf_size destination buffer size
2623  * @param path numbered sequence string
2624  * @param number frame number
2625  * @return 0 if OK, -1 on format error
2626  */
2627 int av_get_frame_filename(char *buf, int buf_size,
2628  const char *path, int number);
2629 
2630 /**
2631  * Check whether filename actually is a numbered sequence generator.
2632  *
2633  * @param filename possible numbered sequence string
2634  * @return 1 if a valid numbered sequence string, 0 otherwise
2635  */
2636 int av_filename_number_test(const char *filename);
2637 
2638 /**
2639  * Generate an SDP for an RTP session.
2640  *
2641  * Note, this overwrites the id values of AVStreams in the muxer contexts
2642  * for getting unique dynamic payload types.
2643  *
2644  * @param ac array of AVFormatContexts describing the RTP streams. If the
2645  * array is composed by only one context, such context can contain
2646  * multiple AVStreams (one AVStream per RTP stream). Otherwise,
2647  * all the contexts in the array (an AVCodecContext per RTP stream)
2648  * must contain only one AVStream.
2649  * @param n_files number of AVCodecContexts contained in ac
2650  * @param buf buffer where the SDP will be stored (must be allocated by
2651  * the caller)
2652  * @param size the size of the buffer
2653  * @return 0 if OK, AVERROR_xxx on error
2654  */
2655 int av_sdp_create(AVFormatContext *ac[], int n_files, char *buf, int size);
2656 
2657 /**
2658  * Return a positive value if the given filename has one of the given
2659  * extensions, 0 otherwise.
2660  *
2661  * @param filename file name to check against the given extensions
2662  * @param extensions a comma-separated list of filename extensions
2663  */
2664 int av_match_ext(const char *filename, const char *extensions);
2665 
2666 /**
2667  * Test if the given container can store a codec.
2668  *
2669  * @param ofmt container to check for compatibility
2670  * @param codec_id codec to potentially store in container
2671  * @param std_compliance standards compliance level, one of FF_COMPLIANCE_*
2672  *
2673  * @return 1 if codec with ID codec_id can be stored in ofmt, 0 if it cannot.
2674  * A negative number if this information is not available.
2675  */
2677  int std_compliance);
2678 
2679 /**
2680  * @defgroup riff_fourcc RIFF FourCCs
2681  * @{
2682  * Get the tables mapping RIFF FourCCs to libavcodec AVCodecIDs. The tables are
2683  * meant to be passed to av_codec_get_id()/av_codec_get_tag() as in the
2684  * following code:
2685  * @code
2686  * uint32_t tag = MKTAG('H', '2', '6', '4');
2687  * const struct AVCodecTag *table[] = { avformat_get_riff_video_tags(), 0 };
2688  * enum AVCodecID id = av_codec_get_id(table, tag);
2689  * @endcode
2690  */
2691 /**
2692  * @return the table mapping RIFF FourCCs for video to libavcodec AVCodecID.
2693  */
2694 const struct AVCodecTag *avformat_get_riff_video_tags(void);
2695 /**
2696  * @return the table mapping RIFF FourCCs for audio to AVCodecID.
2697  */
2698 const struct AVCodecTag *avformat_get_riff_audio_tags(void);
2699 /**
2700  * @return the table mapping MOV FourCCs for video to libavcodec AVCodecID.
2701  */
2702 const struct AVCodecTag *avformat_get_mov_video_tags(void);
2703 /**
2704  * @return the table mapping MOV FourCCs for audio to AVCodecID.
2705  */
2706 const struct AVCodecTag *avformat_get_mov_audio_tags(void);
2707 
2708 /**
2709  * @}
2710  */
2711 
2712 /**
2713  * Guess the sample aspect ratio of a frame, based on both the stream and the
2714  * frame aspect ratio.
2715  *
2716  * Since the frame aspect ratio is set by the codec but the stream aspect ratio
2717  * is set by the demuxer, these two may not be equal. This function tries to
2718  * return the value that you should use if you would like to display the frame.
2719  *
2720  * Basic logic is to use the stream aspect ratio if it is set to something sane
2721  * otherwise use the frame aspect ratio. This way a container setting, which is
2722  * usually easy to modify can override the coded value in the frames.
2723  *
2724  * @param format the format context which the stream is part of
2725  * @param stream the stream which the frame is part of
2726  * @param frame the frame with the aspect ratio to be determined
2727  * @return the guessed (valid) sample_aspect_ratio, 0/1 if no idea
2728  */
2730 
2731 /**
2732  * Guess the frame rate, based on both the container and codec information.
2733  *
2734  * @param ctx the format context which the stream is part of
2735  * @param stream the stream which the frame is part of
2736  * @param frame the frame for which the frame rate should be determined, may be NULL
2737  * @return the guessed (valid) frame rate, 0/1 if no idea
2738  */
2740 
2741 /**
2742  * Check if the stream st contained in s is matched by the stream specifier
2743  * spec.
2744  *
2745  * See the "stream specifiers" chapter in the documentation for the syntax
2746  * of spec.
2747  *
2748  * @return >0 if st is matched by spec;
2749  * 0 if st is not matched by spec;
2750  * AVERROR code if spec is invalid
2751  *
2752  * @note A stream specifier can match several streams in the format.
2753  */
2755  const char *spec);
2756 
2758 
2759 
2760 /**
2761  * @}
2762  */
2763 
2764 #endif /* AVFORMAT_AVFORMAT_H */
unsigned int nb_chapters
Number of chapters in AVChapter array.
Definition: avformat.h:1474
unsigned int max_index_size
Maximum amount of memory in bytes to use for the index of each stream.
Definition: avformat.h:1455
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:3963
int64_t interleaver_chunk_size
Definition: avformat.h:1070
int64_t probesize
Maximum size of the data read from input for determining the input container format.
Definition: avformat.h:1787
unsigned int packet_size
Definition: avformat.h:1377
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:1593
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:1041
Buffered I/O operations.
AVPacketSideDataType
Definition: avcodec.h:1224
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:1498
attribute_deprecated int av_demuxer_open(AVFormatContext *ic)
Definition: utils.c:312
char * recommended_encoder_configuration
String containing paris of key and values describing recommended encoder configuration.
Definition: avformat.h:1173
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:932
AVIOInterruptCB interrupt_callback
Custom interrupt callbacks for the I/O layer.
Definition: avformat.h:1523
ptrdiff_t const GLvoid * data
Definition: opengl_enc.c:101
static void flush(AVCodecContext *avctx)
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:1745
int flush_packets
Flush the I/O context after each packet.
Definition: avformat.h:1660
enum AVCodecID id
Definition: mxfenc.c:101
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:447
int av_write_frame(AVFormatContext *s, AVPacket *pkt)
Write a packet to an output media file.
Definition: mux.c:691
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:1632
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:1099
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:405
int64_t pts_buffer[MAX_REORDER_DELAY+1]
Definition: avformat.h:1043
unsigned int max_picture_buffer
Maximum amount of memory in bytes to use for buffering frames obtained from realtime capture devices...
Definition: avformat.h:1461
int64_t pos
Definition: avformat.h:784
int probe_packets
Number of packets to buffer for codec probing.
Definition: avformat.h:1026
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
struct FFFrac * priv_pts
Definition: avformat.h:1182
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:4265
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:1107
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:1131
AVRational sample_aspect_ratio
sample aspect ratio (0 if unknown)
Definition: avformat.h:914
uint8_t * dump_separator
dump format separator.
Definition: avformat.h:1798
int index
stream index in AVFormatContext
Definition: avformat.h:843
int avio_flags
avio flags, used to force AVIO_FLAG_DIRECT.
Definition: avformat.h:1624
AVIndexEntry * index_entries
Only used if the format does not support seeking natively.
Definition: avformat.h:1045
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:4559
int event_flags
Flags for the user to detect events happening on the file.
Definition: avformat.h:1560
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:1032
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:1114
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:1322
AVDictionary * metadata
Definition: avformat.h:1240
enum AVCodecID subtitle_codec_id
Forced subtitle codec_id.
Definition: avformat.h:1443
AVCodec.
Definition: avcodec.h:3472
int strict_std_compliance
Allow non-standard and experimental extension.
Definition: avformat.h:1553
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:129
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:1821
int64_t last_dts_for_order_check
Internal data to analyze DTS and detect faulty mpeg streams.
Definition: avformat.h:1159
Format I/O context.
Definition: avformat.h:1273
int64_t output_ts_offset
Output timestamp offset, in microseconds.
Definition: avformat.h:1763
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:4288
unsigned int nb_stream_indexes
Definition: avformat.h:1211
int64_t cur_dts
Definition: avformat.h:1019
const struct AVCodecTag * avformat_get_mov_audio_tags(void)
Definition: isom.c:603
Public dictionary API.
int flags
Definition: avformat.h:1208
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:1068
const struct AVCodecTag * avformat_get_riff_video_tags(void)
Definition: riff.c:472
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:1856
int priv_data_size
size of private data so that it can be allocated in the wrapper
Definition: avformat.h:554
The exact value of the fractional number is: 'val + num / den'.
Definition: internal.h:59
int id
unique ID to identify the chapter
Definition: avformat.h:1237
enum AVStreamParseType need_parsing
Definition: avformat.h:1034
int id
Format-specific stream ID.
Definition: avformat.h:849
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:4309
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:1257
AVStream * avformat_new_stream(AVFormatContext *s, const AVCodec *c)
Add a new stream to a media file.
Definition: utils.c:3749
int pmt_pid
Definition: avformat.h:1215
AVStream ** streams
A list of all streams in the file.
Definition: avformat.h:1341
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:111
int inject_global_side_data
Internal data to inject global side data.
Definition: avformat.h:1166
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:1042
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:1384
AVProgram * av_new_program(AVFormatContext *s, int id)
Definition: utils.c:3817
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:1547
uint32_t tag
Definition: movenc.c:1334
int avformat_network_init(void)
Do global initialization of network components.
Definition: utils.c:4200
const struct AVCodecTag * avformat_get_riff_audio_tags(void)
Definition: riff.c:477
int fps_probe_size
The number of frames used for determining the framerate in avformat_find_stream_info().
Definition: avformat.h:1505
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:244
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:134
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:1209
const OptionDef options[]
Definition: ffserver.c:3807
unsigned int * stream_index
Definition: avformat.h:1210
AVCodec * av_format_get_audio_codec(const AVFormatContext *s)
enum AVCodecID video_codec_id
Forced video codec_id.
Definition: avformat.h:1431
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:1260
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:254
unsigned int correct_ts_overflow
Correct single timestamp overflows.
Definition: avformat.h:1646
struct AVOutputFormat * oformat
The output container format.
Definition: avformat.h:1292
int64_t start_time
Definition: avformat.h:1225
const struct AVCodecTag * avformat_get_mov_video_tags(void)
Definition: isom.c:598
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:480
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:3572
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:3555
int max_ts_probe
Maximum number of packets to read while waiting for the first timestamp.
Definition: avformat.h:1567
int format_probesize
number of bytes to read maximally to identify format.
Definition: avformat.h:1676
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:1485
int nb_decoded_frames
Number of internally decoded frames, used internally in libavformat, do not access its lifetime diffe...
Definition: avformat.h:1120
int av_index_search_timestamp(AVStream *st, int64_t timestamp, int flags)
Get the index for a specific timestamp.
Definition: utils.c:1844
const AVIOInterruptCB int_cb
Definition: ffmpeg.c:464
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:1228
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:125
unsigned int nb_programs
Definition: avformat.h:1424
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:3638
AVChapter ** chapters
Definition: avformat.h:1475
int skip_samples
Number of samples to skip at the start of the frame decoded from the next packet. ...
Definition: avformat.h:1090
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:1206
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:1214
AVCodec * audio_codec
Forced audio codec.
Definition: avformat.h:1722
void * opaque
User data.
Definition: avformat.h:1752
Only parse headers, do not repack.
Definition: avformat.h:775
char * format_whitelist
',' separated list of allowed demuxers.
Definition: avformat.h:1692
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:4183
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
struct AVStream::@152 * info
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:130
unsigned int nb_streams
Number of elements in AVFormatContext.streams.
Definition: avformat.h:1329
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:3647
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:1349
int update_initial_durations_done
Internal data to prevent doing update_initial_durations() twice.
Definition: avformat.h:1148
enum AVCodecID audio_codec_id
Forced audio codec_id.
Definition: avformat.h:1437
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:1586
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:1259
uint8_t dts_ordered
Definition: avformat.h:1160
int avoid_negative_ts
Avoid negative timestamps during muxing.
Definition: avformat.h:1576
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:1669
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:1639
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)
int64_t max_analyze_duration
Maximum duration (in AV_TIME_BASE units) of the data read from input in avformat_find_stream_info().
Definition: avformat.h:1775
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:3908
uint8_t pts_reorder_error_count[MAX_REORDER_DELAY+1]
Definition: avformat.h:1154
int ts_id
Transport stream id.
Definition: avformat.h:1585
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:1745
int av_format_get_probe_score(const AVFormatContext *s)
Definition: utils.c:173
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:1239
int avformat_queue_attached_pictures(AVFormatContext *s)
Definition: utils.c:382
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:4213
uint8_t dts_misordered
Definition: avformat.h:1161
int64_t pts_reorder_error[MAX_REORDER_DELAY+1]
Internal data to generate dts from pts.
Definition: avformat.h:1153
int64_t end_time
Definition: avformat.h:1226
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:1528
AVIOContext * pb
I/O context.
Definition: avformat.h:1315
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:1502
int io_repositioned
IO repositioned flag.
Definition: avformat.h:1706
int av_filename_number_test(const char *filename)
Check whether filename actually is a numbered sequence generator.
Definition: utils.c:261
void av_format_set_video_codec(AVFormatContext *s, AVCodec *c)
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:1229
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:1047
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:1180
AVRational av_stream_get_r_frame_rate(const AVStream *s)
const AVClass * av_class
A class for logging and AVOptions.
Definition: avformat.h:1278
AVMediaType
Definition: avutil.h:191
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:3686
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:1478
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:2222
int seek2any
Force seeking to any (also non key) frames.
Definition: avformat.h:1653
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:1212
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:1358
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:1258
int av_seek_frame(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
Seek to the keyframe at timestamp.
Definition: utils.c:2199
int64_t start
Definition: avformat.h:1239
int64_t duration
Decoding: duration of the stream, in stream time base.
Definition: avformat.h:901
int64_t interleaver_chunk_duration
Definition: avformat.h:1071
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:1421
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:1108
struct AVPacketList * next
Definition: avformat.h:1857
int pts_wrap_behavior
Options for behavior, when a wrap is detected.
Definition: avformat.h:1143
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:3084
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:1714
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:1609
int error_recognition
Error recognition; higher values will detect more errors but may misdetect some more or less valid pa...
Definition: avformat.h:1512
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:1247
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:1238
av_format_control_message control_message_cb
Callback used by devices to communicate with application.
Definition: avformat.h:1757
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:1285
void avformat_close_input(AVFormatContext **s)
Close an opened input AVFormatContext.
Definition: utils.c:3721
int av_write_uncoded_frame(AVFormatContext *s, int stream_index, AVFrame *frame)
Write a uncoded frame to an output media file.
Definition: mux.c:1102
int64_t codec_info_duration_fields
Definition: avformat.h:987
unsigned int index_entries_allocated_size
Definition: avformat.h:1048
int64_t mux_ts_offset
Timestamp offset added to timestamps before muxing NOT PART OF PUBLIC API.
Definition: avformat.h:1126
int skip_to_keyframe
Indicates that everything up to the next keyframe should be discarded.
Definition: avformat.h:1085
enum AVCodecID data_codec_id
Forced Data codec_id.
Definition: avformat.h:1804
AVCodec * subtitle_codec
Forced subtitle codec.
Definition: avformat.h:1730
int(* AVOpenCallback)(struct AVFormatContext *s, AVIOContext **pb, const char *url, int flags, const AVIOInterruptCB *int_cb, AVDictionary **options)
Definition: avformat.h:1250
AVCodec * data_codec
Forced data codec.
Definition: avformat.h:1738
enum AVCodecID audio_codec
default audio codec
Definition: avformat.h:523
char * codec_whitelist
',' separated list of allowed decoders.
Definition: avformat.h:1684
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:1601
struct AVCodecParserContext * parser
Definition: avformat.h:1035
void * priv_data
Format private data.
Definition: avformat.h:1301
int pcr_pid
Definition: avformat.h:1216
int codec_info_nb_frames
Number of frames that have been demuxed during av_find_stream_info()
Definition: avformat.h:1031
void av_format_set_control_message_cb(AVFormatContext *s, av_format_control_message callback)
AVDiscard
Definition: avcodec.h:680
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:986
int bit_rate
Total stream bitrate in bit/s, 0 if not available.
Definition: avformat.h:1375
int64_t duration
Duration of the stream, in AV_TIME_BASE fractional seconds.
Definition: avformat.h:1368
int avformat_flush(AVFormatContext *s)
Discard all internally buffered data.
Definition: utils.c:2278
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:330
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:1061
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:1080
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:1617
This structure stores compressed data.
Definition: avcodec.h:1400
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:1040
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:1114
AVProgram ** programs
Definition: avformat.h:1425