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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 libavformat
32  * I/O and Muxing/Demuxing Library
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  * @section urls
82  * URL strings in libavformat are made of a scheme/protocol, a ':', and a
83  * scheme specific string. URLs without a scheme and ':' used for local files
84  * are supported but deprecated. "file:" should be used for local files.
85  *
86  * It is important that the scheme string is not taken from untrusted
87  * sources without checks.
88  *
89  * Note that some schemes/protocols are quite powerful, allowing access to
90  * both local and remote files, parts of them, concatenations of them, local
91  * audio and video devices and so on.
92  *
93  * @{
94  *
95  * @defgroup lavf_decoding Demuxing
96  * @{
97  * Demuxers read a media file and split it into chunks of data (@em packets). A
98  * @ref AVPacket "packet" contains one or more encoded frames which belongs to a
99  * single elementary stream. In the lavf API this process is represented by the
100  * avformat_open_input() function for opening a file, av_read_frame() for
101  * reading a single packet and finally avformat_close_input(), which does the
102  * cleanup.
103  *
104  * @section lavf_decoding_open Opening a media file
105  * The minimum information required to open a file is its URL, which
106  * is passed to avformat_open_input(), as in the following code:
107  * @code
108  * const char *url = "file:in.mp3";
109  * AVFormatContext *s = NULL;
110  * int ret = avformat_open_input(&s, url, NULL, NULL);
111  * if (ret < 0)
112  * abort();
113  * @endcode
114  * The above code attempts to allocate an AVFormatContext, open the
115  * specified file (autodetecting the format) and read the header, exporting the
116  * information stored there into s. Some formats do not have a header or do not
117  * store enough information there, so it is recommended that you call the
118  * avformat_find_stream_info() function which tries to read and decode a few
119  * frames to find missing information.
120  *
121  * In some cases you might want to preallocate an AVFormatContext yourself with
122  * avformat_alloc_context() and do some tweaking on it before passing it to
123  * avformat_open_input(). One such case is when you want to use custom functions
124  * for reading input data instead of lavf internal I/O layer.
125  * To do that, create your own AVIOContext with avio_alloc_context(), passing
126  * your reading callbacks to it. Then set the @em pb field of your
127  * AVFormatContext to newly created AVIOContext.
128  *
129  * Since the format of the opened file is in general not known until after
130  * avformat_open_input() has returned, it is not possible to set demuxer private
131  * options on a preallocated context. Instead, the options should be passed to
132  * avformat_open_input() wrapped in an AVDictionary:
133  * @code
134  * AVDictionary *options = NULL;
135  * av_dict_set(&options, "video_size", "640x480", 0);
136  * av_dict_set(&options, "pixel_format", "rgb24", 0);
137  *
138  * if (avformat_open_input(&s, url, NULL, &options) < 0)
139  * abort();
140  * av_dict_free(&options);
141  * @endcode
142  * This code passes the private options 'video_size' and 'pixel_format' to the
143  * demuxer. They would be necessary for e.g. the rawvideo demuxer, since it
144  * cannot know how to interpret raw video data otherwise. If the format turns
145  * out to be something different than raw video, those options will not be
146  * recognized by the demuxer and therefore will not be applied. Such unrecognized
147  * options are then returned in the options dictionary (recognized options are
148  * consumed). The calling program can handle such unrecognized options as it
149  * wishes, e.g.
150  * @code
151  * AVDictionaryEntry *e;
152  * if (e = av_dict_get(options, "", NULL, AV_DICT_IGNORE_SUFFIX)) {
153  * fprintf(stderr, "Option %s not recognized by the demuxer.\n", e->key);
154  * abort();
155  * }
156  * @endcode
157  *
158  * After you have finished reading the file, you must close it with
159  * avformat_close_input(). It will free everything associated with the file.
160  *
161  * @section lavf_decoding_read Reading from an opened file
162  * Reading data from an opened AVFormatContext is done by repeatedly calling
163  * av_read_frame() on it. Each call, if successful, will return an AVPacket
164  * containing encoded data for one AVStream, identified by
165  * AVPacket.stream_index. This packet may be passed straight into the libavcodec
166  * decoding functions avcodec_send_packet() or avcodec_decode_subtitle2() if the
167  * caller wishes to decode the data.
168  *
169  * AVPacket.pts, AVPacket.dts and AVPacket.duration timing information will be
170  * set if known. They may also be unset (i.e. AV_NOPTS_VALUE for
171  * pts/dts, 0 for duration) if the stream does not provide them. The timing
172  * information will be in AVStream.time_base units, i.e. it has to be
173  * multiplied by the timebase to convert them to seconds.
174  *
175  * If AVPacket.buf is set on the returned packet, then the packet is
176  * allocated dynamically and the user may keep it indefinitely.
177  * Otherwise, if AVPacket.buf is NULL, the packet data is backed by a
178  * static storage somewhere inside the demuxer and the packet is only valid
179  * until the next av_read_frame() call or closing the file. If the caller
180  * requires a longer lifetime, av_dup_packet() will make an av_malloc()ed copy
181  * of it.
182  * In both cases, the packet must be freed with av_packet_unref() when it is no
183  * longer needed.
184  *
185  * @section lavf_decoding_seek Seeking
186  * @}
187  *
188  * @defgroup lavf_encoding Muxing
189  * @{
190  * Muxers take encoded data in the form of @ref AVPacket "AVPackets" and write
191  * it into files or other output bytestreams in the specified container format.
192  *
193  * The main API functions for muxing are avformat_write_header() for writing the
194  * file header, av_write_frame() / av_interleaved_write_frame() for writing the
195  * packets and av_write_trailer() for finalizing the file.
196  *
197  * At the beginning of the muxing process, the caller must first call
198  * avformat_alloc_context() to create a muxing context. The caller then sets up
199  * the muxer by filling the various fields in this context:
200  *
201  * - The @ref AVFormatContext.oformat "oformat" field must be set to select the
202  * muxer that will be used.
203  * - Unless the format is of the AVFMT_NOFILE type, the @ref AVFormatContext.pb
204  * "pb" field must be set to an opened IO context, either returned from
205  * avio_open2() or a custom one.
206  * - Unless the format is of the AVFMT_NOSTREAMS type, at least one stream must
207  * be created with the avformat_new_stream() function. The caller should fill
208  * the @ref AVStream.codecpar "stream codec parameters" information, such as the
209  * codec @ref AVCodecParameters.codec_type "type", @ref AVCodecParameters.codec_id
210  * "id" and other parameters (e.g. width / height, the pixel or sample format,
211  * etc.) as known. The @ref AVStream.time_base "stream timebase" should
212  * be set to the timebase that the caller desires to use for this stream (note
213  * that the timebase actually used by the muxer can be different, as will be
214  * described later).
215  * - It is advised to manually initialize only the relevant fields in
216  * AVCodecParameters, rather than using @ref avcodec_parameters_copy() during
217  * remuxing: there is no guarantee that the codec context values remain valid
218  * for both input and output format contexts.
219  * - The caller may fill in additional information, such as @ref
220  * AVFormatContext.metadata "global" or @ref AVStream.metadata "per-stream"
221  * metadata, @ref AVFormatContext.chapters "chapters", @ref
222  * AVFormatContext.programs "programs", etc. as described in the
223  * AVFormatContext documentation. Whether such information will actually be
224  * stored in the output depends on what the container format and the muxer
225  * support.
226  *
227  * When the muxing context is fully set up, the caller must call
228  * avformat_write_header() to initialize the muxer internals and write the file
229  * header. Whether anything actually is written to the IO context at this step
230  * depends on the muxer, but this function must always be called. Any muxer
231  * private options must be passed in the options parameter to this function.
232  *
233  * The data is then sent to the muxer by repeatedly calling av_write_frame() or
234  * av_interleaved_write_frame() (consult those functions' documentation for
235  * discussion on the difference between them; only one of them may be used with
236  * a single muxing context, they should not be mixed). Do note that the timing
237  * information on the packets sent to the muxer must be in the corresponding
238  * AVStream's timebase. That timebase is set by the muxer (in the
239  * avformat_write_header() step) and may be different from the timebase
240  * requested by the caller.
241  *
242  * Once all the data has been written, the caller must call av_write_trailer()
243  * to flush any buffered packets and finalize the output file, then close the IO
244  * context (if any) and finally free the muxing context with
245  * avformat_free_context().
246  * @}
247  *
248  * @defgroup lavf_io I/O Read/Write
249  * @{
250  * @section lavf_io_dirlist Directory listing
251  * The directory listing API makes it possible to list files on remote servers.
252  *
253  * Some of possible use cases:
254  * - an "open file" dialog to choose files from a remote location,
255  * - a recursive media finder providing a player with an ability to play all
256  * files from a given directory.
257  *
258  * @subsection lavf_io_dirlist_open Opening a directory
259  * At first, a directory needs to be opened by calling avio_open_dir()
260  * supplied with a URL and, optionally, ::AVDictionary containing
261  * protocol-specific parameters. The function returns zero or positive
262  * integer and allocates AVIODirContext on success.
263  *
264  * @code
265  * AVIODirContext *ctx = NULL;
266  * if (avio_open_dir(&ctx, "smb://example.com/some_dir", NULL) < 0) {
267  * fprintf(stderr, "Cannot open directory.\n");
268  * abort();
269  * }
270  * @endcode
271  *
272  * This code tries to open a sample directory using smb protocol without
273  * any additional parameters.
274  *
275  * @subsection lavf_io_dirlist_read Reading entries
276  * Each directory's entry (i.e. file, another directory, anything else
277  * within ::AVIODirEntryType) is represented by AVIODirEntry.
278  * Reading consecutive entries from an opened AVIODirContext is done by
279  * repeatedly calling avio_read_dir() on it. Each call returns zero or
280  * positive integer if successful. Reading can be stopped right after the
281  * NULL entry has been read -- it means there are no entries left to be
282  * read. The following code reads all entries from a directory associated
283  * with ctx and prints their names to standard output.
284  * @code
285  * AVIODirEntry *entry = NULL;
286  * for (;;) {
287  * if (avio_read_dir(ctx, &entry) < 0) {
288  * fprintf(stderr, "Cannot list directory.\n");
289  * abort();
290  * }
291  * if (!entry)
292  * break;
293  * printf("%s\n", entry->name);
294  * avio_free_directory_entry(&entry);
295  * }
296  * @endcode
297  * @}
298  *
299  * @defgroup lavf_codec Demuxers
300  * @{
301  * @defgroup lavf_codec_native Native Demuxers
302  * @{
303  * @}
304  * @defgroup lavf_codec_wrappers External library wrappers
305  * @{
306  * @}
307  * @}
308  * @defgroup lavf_protos I/O Protocols
309  * @{
310  * @}
311  * @defgroup lavf_internal Internal
312  * @{
313  * @}
314  * @}
315  */
316 
317 #include <time.h>
318 #include <stdio.h> /* FILE */
319 #include "libavcodec/avcodec.h"
320 #include "libavutil/dict.h"
321 #include "libavutil/log.h"
322 
323 #include "avio.h"
324 #include "libavformat/version.h"
325 
326 struct AVFormatContext;
327 
328 struct AVDeviceInfoList;
330 
331 /**
332  * @defgroup metadata_api Public Metadata API
333  * @{
334  * @ingroup libavf
335  * The metadata API allows libavformat to export metadata tags to a client
336  * application when demuxing. Conversely it allows a client application to
337  * set metadata when muxing.
338  *
339  * Metadata is exported or set as pairs of key/value strings in the 'metadata'
340  * fields of the AVFormatContext, AVStream, AVChapter and AVProgram structs
341  * using the @ref lavu_dict "AVDictionary" API. Like all strings in FFmpeg,
342  * metadata is assumed to be UTF-8 encoded Unicode. Note that metadata
343  * exported by demuxers isn't checked to be valid UTF-8 in most cases.
344  *
345  * Important concepts to keep in mind:
346  * - Keys are unique; there can never be 2 tags with the same key. This is
347  * also meant semantically, i.e., a demuxer should not knowingly produce
348  * several keys that are literally different but semantically identical.
349  * E.g., key=Author5, key=Author6. In this example, all authors must be
350  * placed in the same tag.
351  * - Metadata is flat, not hierarchical; there are no subtags. If you
352  * want to store, e.g., the email address of the child of producer Alice
353  * and actor Bob, that could have key=alice_and_bobs_childs_email_address.
354  * - Several modifiers can be applied to the tag name. This is done by
355  * appending a dash character ('-') and the modifier name in the order
356  * they appear in the list below -- e.g. foo-eng-sort, not foo-sort-eng.
357  * - language -- a tag whose value is localized for a particular language
358  * is appended with the ISO 639-2/B 3-letter language code.
359  * For example: Author-ger=Michael, Author-eng=Mike
360  * The original/default language is in the unqualified "Author" tag.
361  * A demuxer should set a default if it sets any translated tag.
362  * - sorting -- a modified version of a tag that should be used for
363  * sorting will have '-sort' appended. E.g. artist="The Beatles",
364  * artist-sort="Beatles, The".
365  * - Some protocols and demuxers support metadata updates. After a successful
366  * call to av_read_packet(), AVFormatContext.event_flags or AVStream.event_flags
367  * will be updated to indicate if metadata changed. In order to detect metadata
368  * changes on a stream, you need to loop through all streams in the AVFormatContext
369  * and check their individual event_flags.
370  *
371  * - Demuxers attempt to export metadata in a generic format, however tags
372  * with no generic equivalents are left as they are stored in the container.
373  * Follows a list of generic tag names:
374  *
375  @verbatim
376  album -- name of the set this work belongs to
377  album_artist -- main creator of the set/album, if different from artist.
378  e.g. "Various Artists" for compilation albums.
379  artist -- main creator of the work
380  comment -- any additional description of the file.
381  composer -- who composed the work, if different from artist.
382  copyright -- name of copyright holder.
383  creation_time-- date when the file was created, preferably in ISO 8601.
384  date -- date when the work was created, preferably in ISO 8601.
385  disc -- number of a subset, e.g. disc in a multi-disc collection.
386  encoder -- name/settings of the software/hardware that produced the file.
387  encoded_by -- person/group who created the file.
388  filename -- original name of the file.
389  genre -- <self-evident>.
390  language -- main language in which the work is performed, preferably
391  in ISO 639-2 format. Multiple languages can be specified by
392  separating them with commas.
393  performer -- artist who performed the work, if different from artist.
394  E.g for "Also sprach Zarathustra", artist would be "Richard
395  Strauss" and performer "London Philharmonic Orchestra".
396  publisher -- name of the label/publisher.
397  service_name -- name of the service in broadcasting (channel name).
398  service_provider -- name of the service provider in broadcasting.
399  title -- name of the work.
400  track -- number of this work in the set, can be in form current/total.
401  variant_bitrate -- the total bitrate of the bitrate variant that the current stream is part of
402  @endverbatim
403  *
404  * Look in the examples section for an application example how to use the Metadata API.
405  *
406  * @}
407  */
408 
409 /* packet functions */
410 
411 
412 /**
413  * Allocate and read the payload of a packet and initialize its
414  * fields with default values.
415  *
416  * @param s associated IO context
417  * @param pkt packet
418  * @param size desired payload size
419  * @return >0 (read size) if OK, AVERROR_xxx otherwise
420  */
422 
423 
424 /**
425  * Read data and append it to the current content of the AVPacket.
426  * If pkt->size is 0 this is identical to av_get_packet.
427  * Note that this uses av_grow_packet and thus involves a realloc
428  * which is inefficient. Thus this function should only be used
429  * when there is no reasonable way to know (an upper bound of)
430  * the final size.
431  *
432  * @param s associated IO context
433  * @param pkt packet
434  * @param size amount of data to read
435  * @return >0 (read size) if OK, AVERROR_xxx otherwise, previous data
436  * will not be lost even if an error occurs.
437  */
439 
440 #if FF_API_LAVF_FRAC
441 /*************************************************/
442 /* fractional numbers for exact pts handling */
443 
444 /**
445  * The exact value of the fractional number is: 'val + num / den'.
446  * num is assumed to be 0 <= num < den.
447  */
448 typedef struct AVFrac {
449  int64_t val, num, den;
450 } AVFrac;
451 #endif
452 
453 /*************************************************/
454 /* input/output formats */
455 
456 struct AVCodecTag;
457 
458 /**
459  * This structure contains the data a format has to probe a file.
460  */
461 typedef struct AVProbeData {
462  const char *filename;
463  unsigned char *buf; /**< Buffer must have AVPROBE_PADDING_SIZE of extra allocated bytes filled with zero. */
464  int buf_size; /**< Size of buf except extra allocated bytes */
465  const char *mime_type; /**< mime_type, when known. */
466 } AVProbeData;
467 
468 #define AVPROBE_SCORE_RETRY (AVPROBE_SCORE_MAX/4)
469 #define AVPROBE_SCORE_STREAM_RETRY (AVPROBE_SCORE_MAX/4-1)
470 
471 #define AVPROBE_SCORE_EXTENSION 50 ///< score for file extension
472 #define AVPROBE_SCORE_MIME 75 ///< score for file mime type
473 #define AVPROBE_SCORE_MAX 100 ///< maximum score
474 
475 #define AVPROBE_PADDING_SIZE 32 ///< extra allocated bytes at the end of the probe buffer
476 
477 /// Demuxer will use avio_open, no opened file should be provided by the caller.
478 #define AVFMT_NOFILE 0x0001
479 #define AVFMT_NEEDNUMBER 0x0002 /**< Needs '%d' in filename. */
480 #define AVFMT_SHOW_IDS 0x0008 /**< Show format stream IDs numbers. */
481 #if FF_API_LAVF_FMT_RAWPICTURE
482 #define AVFMT_RAWPICTURE 0x0020 /**< Format wants AVPicture structure for
483  raw picture data. @deprecated Not used anymore */
484 #endif
485 #define AVFMT_GLOBALHEADER 0x0040 /**< Format wants global header. */
486 #define AVFMT_NOTIMESTAMPS 0x0080 /**< Format does not need / have any timestamps. */
487 #define AVFMT_GENERIC_INDEX 0x0100 /**< Use generic index building code. */
488 #define AVFMT_TS_DISCONT 0x0200 /**< Format allows timestamp discontinuities. Note, muxers always require valid (monotone) timestamps */
489 #define AVFMT_VARIABLE_FPS 0x0400 /**< Format allows variable fps. */
490 #define AVFMT_NODIMENSIONS 0x0800 /**< Format does not need width/height */
491 #define AVFMT_NOSTREAMS 0x1000 /**< Format does not require any streams */
492 #define AVFMT_NOBINSEARCH 0x2000 /**< Format does not allow to fall back on binary search via read_timestamp */
493 #define AVFMT_NOGENSEARCH 0x4000 /**< Format does not allow to fall back on generic search */
494 #define AVFMT_NO_BYTE_SEEK 0x8000 /**< Format does not allow seeking by bytes */
495 #define AVFMT_ALLOW_FLUSH 0x10000 /**< Format allows flushing. If not set, the muxer will not receive a NULL packet in the write_packet function. */
496 #define AVFMT_TS_NONSTRICT 0x20000 /**< Format does not require strictly
497  increasing timestamps, but they must
498  still be monotonic */
499 #define AVFMT_TS_NEGATIVE 0x40000 /**< Format allows muxing negative
500  timestamps. If not set the timestamp
501  will be shifted in av_write_frame and
502  av_interleaved_write_frame so they
503  start from 0.
504  The user or muxer can override this through
505  AVFormatContext.avoid_negative_ts
506  */
507 
508 #define AVFMT_SEEK_TO_PTS 0x4000000 /**< Seeking is based on PTS */
509 
510 /**
511  * @addtogroup lavf_encoding
512  * @{
513  */
514 typedef struct AVOutputFormat {
515  const char *name;
516  /**
517  * Descriptive name for the format, meant to be more human-readable
518  * than name. You should use the NULL_IF_CONFIG_SMALL() macro
519  * to define it.
520  */
521  const char *long_name;
522  const char *mime_type;
523  const char *extensions; /**< comma-separated filename extensions */
524  /* output support */
525  enum AVCodecID audio_codec; /**< default audio codec */
526  enum AVCodecID video_codec; /**< default video codec */
527  enum AVCodecID subtitle_codec; /**< default subtitle codec */
528  /**
529  * can use flags: AVFMT_NOFILE, AVFMT_NEEDNUMBER,
530  * AVFMT_GLOBALHEADER, AVFMT_NOTIMESTAMPS, AVFMT_VARIABLE_FPS,
531  * AVFMT_NODIMENSIONS, AVFMT_NOSTREAMS, AVFMT_ALLOW_FLUSH,
532  * AVFMT_TS_NONSTRICT, AVFMT_TS_NEGATIVE
533  */
534  int flags;
536  /**
537  * List of supported codec_id-codec_tag pairs, ordered by "better
538  * choice first". The arrays are all terminated by AV_CODEC_ID_NONE.
539  */
540  const struct AVCodecTag * const *codec_tag;
541 
542 
543  const AVClass *priv_class; ///< AVClass for the private context
544 
545  /*****************************************************************
546  * No fields below this line are part of the public API. They
547  * may not be used outside of libavformat and can be changed and
548  * removed at will.
549  * New public fields should be added right above.
550  *****************************************************************
551  */
553  /**
554  * size of private data so that it can be allocated in the wrapper
555  */
556  int priv_data_size;
557 
558  int (*write_header)(struct AVFormatContext *);
559  /**
560  * Write a packet. If AVFMT_ALLOW_FLUSH is set in flags,
561  * pkt can be NULL in order to flush data buffered in the muxer.
562  * When flushing, return 0 if there still is more data to flush,
563  * or 1 if everything was flushed and there is no more buffered
564  * data.
565  */
566  int (*write_packet)(struct AVFormatContext *, AVPacket *pkt);
567  int (*write_trailer)(struct AVFormatContext *);
568  /**
569  * Currently only used to set pixel format if not YUV420P.
570  */
571  int (*interleave_packet)(struct AVFormatContext *, AVPacket *out,
572  AVPacket *in, int flush);
573  /**
574  * Test if the given codec can be stored in this container.
575  *
576  * @return 1 if the codec is supported, 0 if it is not.
577  * A negative number if unknown.
578  * MKTAG('A', 'P', 'I', 'C') if the codec is only supported as AV_DISPOSITION_ATTACHED_PIC
579  */
580  int (*query_codec)(enum AVCodecID id, int std_compliance);
581 
582  void (*get_output_timestamp)(struct AVFormatContext *s, int stream,
583  int64_t *dts, int64_t *wall);
584  /**
585  * Allows sending messages from application to device.
586  */
587  int (*control_message)(struct AVFormatContext *s, int type,
588  void *data, size_t data_size);
590  /**
591  * Write an uncoded AVFrame.
592  *
593  * See av_write_uncoded_frame() for details.
594  *
595  * The library will free *frame afterwards, but the muxer can prevent it
596  * by setting the pointer to NULL.
597  */
598  int (*write_uncoded_frame)(struct AVFormatContext *, int stream_index,
599  AVFrame **frame, unsigned flags);
600  /**
601  * Returns device list with it properties.
602  * @see avdevice_list_devices() for more details.
603  */
604  int (*get_device_list)(struct AVFormatContext *s, struct AVDeviceInfoList *device_list);
605  /**
606  * Initialize device capabilities submodule.
607  * @see avdevice_capabilities_create() for more details.
608  */
610  /**
611  * Free device capabilities submodule.
612  * @see avdevice_capabilities_free() for more details.
613  */
615  enum AVCodecID data_codec; /**< default data codec */
616  /**
617  * Initialize format. May allocate data here, and set any AVFormatContext or
618  * AVStream parameters that need to be set before packets are sent.
619  * This method must not write output.
620  *
621  * Any allocations made here must be freed in deinit().
622  */
623  int (*init)(struct AVFormatContext *);
624  /**
625  * Deinitialize format. If present, this is called whenever the muxer is being
626  * destroyed, regardless of whether or not the header has been written.
627  *
628  * If a trailer is being written, this is called after write_trailer().
629  *
630  * This is called if init() fails as well.
631  */
633  /**
634  * Set up any necessary bitstream filtering and extract any extra data needed
635  * for the global header.
636  * Return 0 if more packets from this stream must be checked; 1 if not.
637  */
638  int (*check_bitstream)(struct AVFormatContext *, const AVPacket *pkt);
640 /**
641  * @}
642  */
643 
644 /**
645  * @addtogroup lavf_decoding
646  * @{
647  */
648 typedef struct AVInputFormat {
649  /**
650  * A comma separated list of short names for the format. New names
651  * may be appended with a minor bump.
652  */
653  const char *name;
654 
655  /**
656  * Descriptive name for the format, meant to be more human-readable
657  * than name. You should use the NULL_IF_CONFIG_SMALL() macro
658  * to define it.
659  */
660  const char *long_name;
661 
662  /**
663  * Can use flags: AVFMT_NOFILE, AVFMT_NEEDNUMBER, AVFMT_SHOW_IDS,
664  * AVFMT_GENERIC_INDEX, AVFMT_TS_DISCONT, AVFMT_NOBINSEARCH,
665  * AVFMT_NOGENSEARCH, AVFMT_NO_BYTE_SEEK, AVFMT_SEEK_TO_PTS.
666  */
667  int flags;
668 
669  /**
670  * If extensions are defined, then no probe is done. You should
671  * usually not use extension format guessing because it is not
672  * reliable enough
673  */
674  const char *extensions;
675 
676  const struct AVCodecTag * const *codec_tag;
677 
678  const AVClass *priv_class; ///< AVClass for the private context
679 
680  /**
681  * Comma-separated list of mime types.
682  * It is used check for matching mime types while probing.
683  * @see av_probe_input_format2
684  */
685  const char *mime_type;
686 
687  /*****************************************************************
688  * No fields below this line are part of the public API. They
689  * may not be used outside of libavformat and can be changed and
690  * removed at will.
691  * New public fields should be added right above.
692  *****************************************************************
693  */
695 
696  /**
697  * Raw demuxers store their codec ID here.
698  */
699  int raw_codec_id;
700 
701  /**
702  * Size of private data so that it can be allocated in the wrapper.
703  */
704  int priv_data_size;
705 
706  /**
707  * Tell if a given file has a chance of being parsed as this format.
708  * The buffer provided is guaranteed to be AVPROBE_PADDING_SIZE bytes
709  * big so you do not have to check for that unless you need more.
710  */
711  int (*read_probe)(AVProbeData *);
712 
713  /**
714  * Read the format header and initialize the AVFormatContext
715  * structure. Return 0 if OK. 'avformat_new_stream' should be
716  * called to create new streams.
717  */
718  int (*read_header)(struct AVFormatContext *);
719 
720  /**
721  * Read one packet and put it in 'pkt'. pts and flags are also
722  * set. 'avformat_new_stream' can be called only if the flag
723  * AVFMTCTX_NOHEADER is used and only in the calling thread (not in a
724  * background thread).
725  * @return 0 on success, < 0 on error.
726  * When returning an error, pkt must not have been allocated
727  * or must be freed before returning
728  */
729  int (*read_packet)(struct AVFormatContext *, AVPacket *pkt);
730 
731  /**
732  * Close the stream. The AVFormatContext and AVStreams are not
733  * freed by this function
734  */
735  int (*read_close)(struct AVFormatContext *);
736 
737  /**
738  * Seek to a given timestamp relative to the frames in
739  * stream component stream_index.
740  * @param stream_index Must not be -1.
741  * @param flags Selects which direction should be preferred if no exact
742  * match is available.
743  * @return >= 0 on success (but not necessarily the new offset)
744  */
745  int (*read_seek)(struct AVFormatContext *,
746  int stream_index, int64_t timestamp, int flags);
747 
748  /**
749  * Get the next timestamp in stream[stream_index].time_base units.
750  * @return the timestamp or AV_NOPTS_VALUE if an error occurred
751  */
752  int64_t (*read_timestamp)(struct AVFormatContext *s, int stream_index,
753  int64_t *pos, int64_t pos_limit);
755  /**
756  * Start/resume playing - only meaningful if using a network-based format
757  * (RTSP).
758  */
759  int (*read_play)(struct AVFormatContext *);
760 
761  /**
762  * Pause playing - only meaningful if using a network-based format
763  * (RTSP).
764  */
765  int (*read_pause)(struct AVFormatContext *);
766 
767  /**
768  * Seek to timestamp ts.
769  * Seeking will be done so that the point from which all active streams
770  * can be presented successfully will be closest to ts and within min/max_ts.
771  * Active streams are all streams that have AVStream.discard < AVDISCARD_ALL.
772  */
773  int (*read_seek2)(struct AVFormatContext *s, int stream_index, int64_t min_ts, int64_t ts, int64_t max_ts, int flags);
775  /**
776  * Returns device list with it properties.
777  * @see avdevice_list_devices() for more details.
778  */
779  int (*get_device_list)(struct AVFormatContext *s, struct AVDeviceInfoList *device_list);
780 
781  /**
782  * Initialize device capabilities submodule.
783  * @see avdevice_capabilities_create() for more details.
784  */
786 
787  /**
788  * Free device capabilities submodule.
789  * @see avdevice_capabilities_free() for more details.
790  */
792 } AVInputFormat;
793 /**
794  * @}
795  */
796 
797 enum AVStreamParseType {
799  AVSTREAM_PARSE_FULL, /**< full parsing and repack */
800  AVSTREAM_PARSE_HEADERS, /**< Only parse headers, do not repack. */
801  AVSTREAM_PARSE_TIMESTAMPS, /**< full parsing and interpolation of timestamps for frames not starting on a packet boundary */
802  AVSTREAM_PARSE_FULL_ONCE, /**< full parsing and repack of the first frame only, only implemented for H.264 currently */
803  AVSTREAM_PARSE_FULL_RAW=MKTAG(0,'R','A','W'), /**< full parsing and repack with timestamp and position generation by parser for raw
804  this assumes that each packet in the file contains no demuxer level headers and
805  just codec level data, otherwise position generation would fail */
806 };
808 typedef struct AVIndexEntry {
809  int64_t pos;
810  int64_t timestamp; /**<
811  * Timestamp in AVStream.time_base units, preferably the time from which on correctly decoded frames are available
812  * when seeking to this entry. That means preferable PTS on keyframe based formats.
813  * But demuxers can choose to store a different timestamp, if it is more convenient for the implementation or nothing better
814  * is known
815  */
816 #define AVINDEX_KEYFRAME 0x0001
817  int flags:2;
818  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).
819  int min_distance; /**< Minimum distance between this and the previous keyframe, used to avoid unneeded searching. */
820 } AVIndexEntry;
821 
822 #define AV_DISPOSITION_DEFAULT 0x0001
823 #define AV_DISPOSITION_DUB 0x0002
824 #define AV_DISPOSITION_ORIGINAL 0x0004
825 #define AV_DISPOSITION_COMMENT 0x0008
826 #define AV_DISPOSITION_LYRICS 0x0010
827 #define AV_DISPOSITION_KARAOKE 0x0020
829 /**
830  * Track should be used during playback by default.
831  * Useful for subtitle track that should be displayed
832  * even when user did not explicitly ask for subtitles.
833  */
834 #define AV_DISPOSITION_FORCED 0x0040
835 #define AV_DISPOSITION_HEARING_IMPAIRED 0x0080 /**< stream for hearing impaired audiences */
836 #define AV_DISPOSITION_VISUAL_IMPAIRED 0x0100 /**< stream for visual impaired audiences */
837 #define AV_DISPOSITION_CLEAN_EFFECTS 0x0200 /**< stream without voice */
838 /**
839  * The stream is stored in the file as an attached picture/"cover art" (e.g.
840  * APIC frame in ID3v2). The single packet associated with it will be returned
841  * among the first few packets read from the file unless seeking takes place.
842  * It can also be accessed at any time in AVStream.attached_pic.
843  */
844 #define AV_DISPOSITION_ATTACHED_PIC 0x0400
847 
848 /**
849  * To specify text track kind (different from subtitles default).
850  */
851 #define AV_DISPOSITION_CAPTIONS 0x10000
852 #define AV_DISPOSITION_DESCRIPTIONS 0x20000
853 #define AV_DISPOSITION_METADATA 0x40000
854 
855 /**
856  * Options for behavior on timestamp wrap detection.
857  */
858 #define AV_PTS_WRAP_IGNORE 0 ///< ignore the wrap
859 #define AV_PTS_WRAP_ADD_OFFSET 1 ///< add the format specific offset on wrap detection
860 #define AV_PTS_WRAP_SUB_OFFSET -1 ///< subtract the format specific offset on wrap detection
862 /**
863  * Stream structure.
864  * New fields can be added to the end with minor version bumps.
865  * Removal, reordering and changes to existing fields require a major
866  * version bump.
867  * sizeof(AVStream) must not be used outside libav*.
868  */
869 typedef struct AVStream {
870  int index; /**< stream index in AVFormatContext */
871  /**
872  * Format-specific stream ID.
873  * decoding: set by libavformat
874  * encoding: set by the user, replaced by libavformat if left unset
875  */
876  int id;
877 #if FF_API_LAVF_AVCTX
878  /**
879  * @deprecated use the codecpar struct instead
880  */
882  AVCodecContext *codec;
883 #endif
884  void *priv_data;
886 #if FF_API_LAVF_FRAC
887  /**
888  * @deprecated this field is unused
889  */
891  struct AVFrac pts;
892 #endif
894  /**
895  * This is the fundamental unit of time (in seconds) in terms
896  * of which frame timestamps are represented.
897  *
898  * decoding: set by libavformat
899  * encoding: May be set by the caller before avformat_write_header() to
900  * provide a hint to the muxer about the desired timebase. In
901  * avformat_write_header(), the muxer will overwrite this field
902  * with the timebase that will actually be used for the timestamps
903  * written into the file (which may or may not be related to the
904  * user-provided one, depending on the format).
905  */
907 
908  /**
909  * Decoding: pts of the first frame of the stream in presentation order, in stream time base.
910  * Only set this if you are absolutely 100% sure that the value you set
911  * it to really is the pts of the first frame.
912  * This may be undefined (AV_NOPTS_VALUE).
913  * @note The ASF header does NOT contain a correct start_time the ASF
914  * demuxer must NOT set this.
915  */
916  int64_t start_time;
917 
918  /**
919  * Decoding: duration of the stream, in stream time base.
920  * If a source file does not specify a duration, but does specify
921  * a bitrate, this value will be estimated from bitrate and file size.
922  */
923  int64_t duration;
924 
925  int64_t nb_frames; ///< number of frames in this stream if known or 0
926 
927  int disposition; /**< AV_DISPOSITION_* bit field */
928 
929  enum AVDiscard discard; ///< Selects which packets can be discarded at will and do not need to be demuxed.
930 
931  /**
932  * sample aspect ratio (0 if unknown)
933  * - encoding: Set by user.
934  * - decoding: Set by libavformat.
935  */
937 
939 
940  /**
941  * Average framerate
942  *
943  * - demuxing: May be set by libavformat when creating the stream or in
944  * avformat_find_stream_info().
945  * - muxing: May be set by the caller before avformat_write_header().
946  */
948 
949  /**
950  * For streams with AV_DISPOSITION_ATTACHED_PIC disposition, this packet
951  * will contain the attached picture.
952  *
953  * decoding: set by libavformat, must not be modified by the caller.
954  * encoding: unused
955  */
957 
958  /**
959  * An array of side data that applies to the whole stream (i.e. the
960  * container does not allow it to change between packets).
961  *
962  * There may be no overlap between the side data in this array and side data
963  * in the packets. I.e. a given side data is either exported by the muxer
964  * (demuxing) / set by the caller (muxing) in this array, then it never
965  * appears in the packets, or the side data is exported / sent through
966  * the packets (always in the first packet where the value becomes known or
967  * changes), then it does not appear in this array.
968  *
969  * - demuxing: Set by libavformat when the stream is created.
970  * - muxing: May be set by the caller before avformat_write_header().
971  *
972  * Freed by libavformat in avformat_free_context().
973  *
974  * @see av_format_inject_global_side_data()
975  */
977  /**
978  * The number of elements in the AVStream.side_data array.
979  */
980  int nb_side_data;
981 
982  /**
983  * Flags for the user to detect events happening on the stream. Flags must
984  * be cleared by the user once the event has been handled.
985  * A combination of AVSTREAM_EVENT_FLAG_*.
986  */
987  int event_flags;
988 #define AVSTREAM_EVENT_FLAG_METADATA_UPDATED 0x0001 ///< The call resulted in updated metadata.
990  /*****************************************************************
991  * All fields below this line are not part of the public API. They
992  * may not be used outside of libavformat and can be changed and
993  * removed at will.
994  * New public fields should be added right above.
995  *****************************************************************
996  */
998  /**
999  * Stream information used internally by av_find_stream_info()
1000  */
1001 #define MAX_STD_TIMEBASES (30*12+30+3+6)
1002  struct {
1003  int64_t last_dts;
1004  int64_t duration_gcd;
1005  int duration_count;
1006  int64_t rfps_duration_sum;
1007  double (*duration_error)[2][MAX_STD_TIMEBASES];
1008  int64_t codec_info_duration;
1011  /**
1012  * 0 -> decoder has not been searched for yet.
1013  * >0 -> decoder found
1014  * <0 -> decoder with codec_id == -found_decoder has not been found
1015  */
1018  int64_t last_duration;
1019 
1020  /**
1021  * Those are used for average framerate estimation.
1022  */
1023  int64_t fps_first_dts;
1024  int fps_first_dts_idx;
1025  int64_t fps_last_dts;
1026  int fps_last_dts_idx;
1028  } *info;
1029 
1030  int pts_wrap_bits; /**< number of bits in pts (used for wrapping control) */
1031 
1032  // Timestamp generation support:
1033  /**
1034  * Timestamp corresponding to the last dts sync point.
1035  *
1036  * Initialized when AVCodecParserContext.dts_sync_point >= 0 and
1037  * a DTS is received from the underlying container. Otherwise set to
1038  * AV_NOPTS_VALUE by default.
1039  */
1040  int64_t first_dts;
1041  int64_t cur_dts;
1042  int64_t last_IP_pts;
1043  int last_IP_duration;
1044 
1045  /**
1046  * Number of packets to buffer for codec probing
1047  */
1048  int probe_packets;
1050  /**
1051  * Number of frames that have been demuxed during av_find_stream_info()
1052  */
1054 
1055  /* av_read_frame() support */
1058 
1059  /**
1060  * last packet in packet_buffer for this stream when muxing.
1061  */
1064 #define MAX_REORDER_DELAY 16
1067  AVIndexEntry *index_entries; /**< Only used if the format does not
1068  support seeking natively. */
1069  int nb_index_entries;
1070  unsigned int index_entries_allocated_size;
1072  /**
1073  * Real base framerate of the stream.
1074  * This is the lowest framerate with which all timestamps can be
1075  * represented accurately (it is the least common multiple of all
1076  * framerates in the stream). Note, this value is just a guess!
1077  * For example, if the time base is 1/90000 and all frames have either
1078  * approximately 3600 or 1800 timer ticks, then r_frame_rate will be 50/1.
1079  *
1080  * Code outside avformat should access this field using:
1081  * av_stream_get/set_r_frame_rate(stream)
1082  */
1084 
1085  /**
1086  * Stream Identifier
1087  * This is the MPEG-TS stream identifier +1
1088  * 0 means unknown
1089  */
1090  int stream_identifier;
1091 
1094 
1095  /**
1096  * stream probing state
1097  * -1 -> probing finished
1098  * 0 -> no probing requested
1099  * rest -> perform probing with request_probe being the minimum score to accept.
1100  * NOT PART OF PUBLIC API
1101  */
1103  /**
1104  * Indicates that everything up to the next keyframe
1105  * should be discarded.
1106  */
1107  int skip_to_keyframe;
1108 
1109  /**
1110  * Number of samples to skip at the start of the frame decoded from the next packet.
1111  */
1112  int skip_samples;
1113 
1114  /**
1115  * If not 0, the number of samples that should be skipped from the start of
1116  * the stream (the samples are removed from packets with pts==0, which also
1117  * assumes negative timestamps do not happen).
1118  * Intended for use with formats such as mp3 with ad-hoc gapless audio
1119  * support.
1120  */
1122 
1123  /**
1124  * If not 0, the first audio sample that should be discarded from the stream.
1125  * This is broken by design (needs global sample count), but can't be
1126  * avoided for broken by design formats such as mp3 with ad-hoc gapless
1127  * audio support.
1128  */
1129  int64_t first_discard_sample;
1131  /**
1132  * The sample after last sample that is intended to be discarded after
1133  * first_discard_sample. Works on frame boundaries only. Used to prevent
1134  * early EOF if the gapless info is broken (considered concatenated mp3s).
1135  */
1136  int64_t last_discard_sample;
1137 
1138  /**
1139  * Number of internally decoded frames, used internally in libavformat, do not access
1140  * its lifetime differs from info which is why it is not in that structure.
1141  */
1142  int nb_decoded_frames;
1143 
1144  /**
1145  * Timestamp offset added to timestamps before muxing
1146  * NOT PART OF PUBLIC API
1147  */
1148  int64_t mux_ts_offset;
1149 
1150  /**
1151  * Internal data to check for wrapping of the time stamp
1152  */
1153  int64_t pts_wrap_reference;
1154 
1155  /**
1156  * Options for behavior, when a wrap is detected.
1157  *
1158  * Defined by AV_PTS_WRAP_ values.
1159  *
1160  * If correction is enabled, there are two possibilities:
1161  * If the first time stamp is near the wrap point, the wrap offset
1162  * will be subtracted, which will create negative time stamps.
1163  * Otherwise the offset will be added.
1164  */
1165  int pts_wrap_behavior;
1166 
1167  /**
1168  * Internal data to prevent doing update_initial_durations() twice
1169  */
1171 
1172  /**
1173  * Internal data to generate dts from pts
1174  */
1177 
1178  /**
1179  * Internal data to analyze DTS and detect faulty mpeg streams
1180  */
1181  int64_t last_dts_for_order_check;
1185  /**
1186  * Internal data to inject global side data
1187  */
1189 
1190  /**
1191  * String containing paris of key and values describing recommended encoder configuration.
1192  * Paris are separated by ','.
1193  * Keys are separated from values by '='.
1194  */
1196 
1197  /**
1198  * display aspect ratio (0 if unknown)
1199  * - encoding: unused
1200  * - decoding: Set by libavformat to calculate sample_aspect_ratio internally
1201  */
1203 
1204  struct FFFrac *priv_pts;
1205 
1206  /**
1207  * An opaque field for libavformat internal usage.
1208  * Must not be accessed in any way by callers.
1209  */
1210  AVStreamInternal *internal;
1212  /*
1213  * Codec parameters associated with this stream. Allocated and freed by
1214  * libavformat in avformat_new_stream() and avformat_free_context()
1215  * respectively.
1216  *
1217  * - demuxing: filled by libavformat on stream creation or in
1218  * avformat_find_stream_info()
1219  * - muxing: filled by the caller before avformat_write_header()
1220  */
1222 } AVStream;
1223 
1228 void av_stream_set_recommended_encoder_configuration(AVStream *s, char *configuration);
1229 
1230 /**
1231  * Returns the pts of the last muxed packet + its duration
1232  *
1233  * the retuned value is undefined when used with a demuxer.
1234  */
1235 int64_t av_stream_get_end_pts(const AVStream *st);
1236 
1237 #define AV_PROGRAM_RUNNING 1
1238 
1239 /**
1240  * New fields can be added to the end with minor version bumps.
1241  * Removal, reordering and changes to existing fields require a major
1242  * version bump.
1243  * sizeof(AVProgram) must not be used outside libav*.
1244  */
1245 typedef struct AVProgram {
1246  int id;
1247  int flags;
1248  enum AVDiscard discard; ///< selects which program to discard and which to feed to the caller
1249  unsigned int *stream_index;
1250  unsigned int nb_stream_indexes;
1252 
1253  int program_num;
1254  int pmt_pid;
1255  int pcr_pid;
1257  /*****************************************************************
1258  * All fields below this line are not part of the public API. They
1259  * may not be used outside of libavformat and can be changed and
1260  * removed at will.
1261  * New public fields should be added right above.
1262  *****************************************************************
1263  */
1264  int64_t start_time;
1265  int64_t end_time;
1266 
1267  int64_t pts_wrap_reference; ///< reference dts for wrap detection
1268  int pts_wrap_behavior; ///< behavior on wrap detection
1269 } AVProgram;
1270 
1271 #define AVFMTCTX_NOHEADER 0x0001 /**< signal that no header is present
1272  (streams are added dynamically) */
1274 typedef struct AVChapter {
1275  int id; ///< unique ID to identify the chapter
1276  AVRational time_base; ///< time base in which the start/end timestamps are specified
1277  int64_t start, end; ///< chapter start/end time in time_base units
1279 } AVChapter;
1281 
1282 /**
1283  * Callback used by devices to communicate with application.
1284  */
1285 typedef int (*av_format_control_message)(struct AVFormatContext *s, int type,
1286  void *data, size_t data_size);
1288 typedef int (*AVOpenCallback)(struct AVFormatContext *s, AVIOContext **pb, const char *url, int flags,
1290 
1291 /**
1292  * The duration of a video can be estimated through various ways, and this enum can be used
1293  * to know how the duration was estimated.
1294  */
1296  AVFMT_DURATION_FROM_PTS, ///< Duration accurately estimated from PTSes
1297  AVFMT_DURATION_FROM_STREAM, ///< Duration estimated from a stream with a known duration
1298  AVFMT_DURATION_FROM_BITRATE ///< Duration estimated from bitrate (less accurate)
1299 };
1300 
1301 typedef struct AVFormatInternal AVFormatInternal;
1302 
1303 /**
1304  * Format I/O context.
1305  * New fields can be added to the end with minor version bumps.
1306  * Removal, reordering and changes to existing fields require a major
1307  * version bump.
1308  * sizeof(AVFormatContext) must not be used outside libav*, use
1309  * avformat_alloc_context() to create an AVFormatContext.
1310  *
1311  * Fields can be accessed through AVOptions (av_opt*),
1312  * the name string used matches the associated command line parameter name and
1313  * can be found in libavformat/options_table.h.
1314  * The AVOption/command line parameter names differ in some cases from the C
1315  * structure field names for historic reasons or brevity.
1316  */
1317 typedef struct AVFormatContext {
1318  /**
1319  * A class for logging and @ref avoptions. Set by avformat_alloc_context().
1320  * Exports (de)muxer private options if they exist.
1321  */
1322  const AVClass *av_class;
1323 
1324  /**
1325  * The input container format.
1326  *
1327  * Demuxing only, set by avformat_open_input().
1328  */
1329  struct AVInputFormat *iformat;
1330 
1331  /**
1332  * The output container format.
1333  *
1334  * Muxing only, must be set by the caller before avformat_write_header().
1335  */
1336  struct AVOutputFormat *oformat;
1337 
1338  /**
1339  * Format private data. This is an AVOptions-enabled struct
1340  * if and only if iformat/oformat.priv_class is not NULL.
1341  *
1342  * - muxing: set by avformat_write_header()
1343  * - demuxing: set by avformat_open_input()
1344  */
1345  void *priv_data;
1347  /**
1348  * I/O context.
1349  *
1350  * - demuxing: either set by the user before avformat_open_input() (then
1351  * the user must close it manually) or set by avformat_open_input().
1352  * - muxing: set by the user before avformat_write_header(). The caller must
1353  * take care of closing / freeing the IO context.
1354  *
1355  * Do NOT set this field if AVFMT_NOFILE flag is set in
1356  * iformat/oformat.flags. In such a case, the (de)muxer will handle
1357  * I/O in some other way and this field will be NULL.
1358  */
1359  AVIOContext *pb;
1360 
1361  /* stream info */
1362  /**
1363  * Flags signalling stream properties. A combination of AVFMTCTX_*.
1364  * Set by libavformat.
1365  */
1366  int ctx_flags;
1367 
1368  /**
1369  * Number of elements in AVFormatContext.streams.
1370  *
1371  * Set by avformat_new_stream(), must not be modified by any other code.
1372  */
1373  unsigned int nb_streams;
1374  /**
1375  * A list of all streams in the file. New streams are created with
1376  * avformat_new_stream().
1377  *
1378  * - demuxing: streams are created by libavformat in avformat_open_input().
1379  * If AVFMTCTX_NOHEADER is set in ctx_flags, then new streams may also
1380  * appear in av_read_frame().
1381  * - muxing: streams are created by the user before avformat_write_header().
1382  *
1383  * Freed by libavformat in avformat_free_context().
1384  */
1385  AVStream **streams;
1386 
1387  /**
1388  * input or output filename
1389  *
1390  * - demuxing: set by avformat_open_input()
1391  * - muxing: may be set by the caller before avformat_write_header()
1392  */
1393  char filename[1024];
1394 
1395  /**
1396  * Position of the first frame of the component, in
1397  * AV_TIME_BASE fractional seconds. NEVER set this value directly:
1398  * It is deduced from the AVStream values.
1399  *
1400  * Demuxing only, set by libavformat.
1401  */
1402  int64_t start_time;
1404  /**
1405  * Duration of the stream, in AV_TIME_BASE fractional
1406  * seconds. Only set this value if you know none of the individual stream
1407  * durations and also do not set any of them. This is deduced from the
1408  * AVStream values if not set.
1409  *
1410  * Demuxing only, set by libavformat.
1411  */
1412  int64_t duration;
1413 
1414  /**
1415  * Total stream bitrate in bit/s, 0 if not
1416  * available. Never set it directly if the file_size and the
1417  * duration are known as FFmpeg can compute it automatically.
1418  */
1419  int64_t bit_rate;
1420 
1421  unsigned int packet_size;
1423 
1424  /**
1425  * Flags modifying the (de)muxer behaviour. A combination of AVFMT_FLAG_*.
1426  * Set by the user before avformat_open_input() / avformat_write_header().
1427  */
1428  int flags;
1429 #define AVFMT_FLAG_GENPTS 0x0001 ///< Generate missing pts even if it requires parsing future frames.
1430 #define AVFMT_FLAG_IGNIDX 0x0002 ///< Ignore index.
1431 #define AVFMT_FLAG_NONBLOCK 0x0004 ///< Do not block when reading packets from input.
1432 #define AVFMT_FLAG_IGNDTS 0x0008 ///< Ignore DTS on frames that contain both DTS & PTS
1433 #define AVFMT_FLAG_NOFILLIN 0x0010 ///< Do not infer any values from other values, just return what is stored in the container
1434 #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
1435 #define AVFMT_FLAG_NOBUFFER 0x0040 ///< Do not buffer frames when possible
1436 #define AVFMT_FLAG_CUSTOM_IO 0x0080 ///< The caller has supplied a custom AVIOContext, don't avio_close() it.
1437 #define AVFMT_FLAG_DISCARD_CORRUPT 0x0100 ///< Discard frames marked corrupted
1438 #define AVFMT_FLAG_FLUSH_PACKETS 0x0200 ///< Flush the AVIOContext every packet.
1439 /**
1440  * When muxing, try to avoid writing any random/volatile data to the output.
1441  * This includes any random IDs, real-time timestamps/dates, muxer version, etc.
1442  *
1443  * This flag is mainly intended for testing.
1444  */
1445 #define AVFMT_FLAG_BITEXACT 0x0400
1446 #define AVFMT_FLAG_MP4A_LATM 0x8000 ///< Enable RTP MP4A-LATM payload
1447 #define AVFMT_FLAG_SORT_DTS 0x10000 ///< try to interleave outputted packets by dts (using this flag can slow demuxing down)
1448 #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)
1449 #define AVFMT_FLAG_KEEP_SIDE_DATA 0x40000 ///< Don't merge side data but keep it separate.
1450 #define AVFMT_FLAG_FAST_SEEK 0x80000 ///< Enable fast, but inaccurate seeks for some formats
1451 
1452  /**
1453  * Maximum size of the data read from input for determining
1454  * the input container format.
1455  * Demuxing only, set by the caller before avformat_open_input().
1456  */
1457  int64_t probesize;
1459  /**
1460  * Maximum duration (in AV_TIME_BASE units) of the data read
1461  * from input in avformat_find_stream_info().
1462  * Demuxing only, set by the caller before avformat_find_stream_info().
1463  * Can be set to 0 to let avformat choose using a heuristic.
1464  */
1465  int64_t max_analyze_duration;
1466 
1467  const uint8_t *key;
1468  int keylen;
1469 
1470  unsigned int nb_programs;
1471  AVProgram **programs;
1472 
1473  /**
1474  * Forced video codec_id.
1475  * Demuxing: Set by user.
1476  */
1479  /**
1480  * Forced audio codec_id.
1481  * Demuxing: Set by user.
1482  */
1484 
1485  /**
1486  * Forced subtitle codec_id.
1487  * Demuxing: Set by user.
1488  */
1490 
1491  /**
1492  * Maximum amount of memory in bytes to use for the index of each stream.
1493  * If the index exceeds this size, entries will be discarded as
1494  * needed to maintain a smaller size. This can lead to slower or less
1495  * accurate seeking (depends on demuxer).
1496  * Demuxers for which a full in-memory index is mandatory will ignore
1497  * this.
1498  * - muxing: unused
1499  * - demuxing: set by user
1500  */
1501  unsigned int max_index_size;
1502 
1503  /**
1504  * Maximum amount of memory in bytes to use for buffering frames
1505  * obtained from realtime capture devices.
1506  */
1507  unsigned int max_picture_buffer;
1508 
1509  /**
1510  * Number of chapters in AVChapter array.
1511  * When muxing, chapters are normally written in the file header,
1512  * so nb_chapters should normally be initialized before write_header
1513  * is called. Some muxers (e.g. mov and mkv) can also write chapters
1514  * in the trailer. To write chapters in the trailer, nb_chapters
1515  * must be zero when write_header is called and non-zero when
1516  * write_trailer is called.
1517  * - muxing: set by user
1518  * - demuxing: set by libavformat
1519  */
1520  unsigned int nb_chapters;
1521  AVChapter **chapters;
1522 
1523  /**
1524  * Metadata that applies to the whole file.
1525  *
1526  * - demuxing: set by libavformat in avformat_open_input()
1527  * - muxing: may be set by the caller before avformat_write_header()
1528  *
1529  * Freed by libavformat in avformat_free_context().
1530  */
1532 
1533  /**
1534  * Start time of the stream in real world time, in microseconds
1535  * since the Unix epoch (00:00 1st January 1970). That is, pts=0 in the
1536  * stream was captured at this real world time.
1537  * - muxing: Set by the caller before avformat_write_header(). If set to
1538  * either 0 or AV_NOPTS_VALUE, then the current wall-time will
1539  * be used.
1540  * - demuxing: Set by libavformat. AV_NOPTS_VALUE if unknown. Note that
1541  * the value may become known after some number of frames
1542  * have been received.
1543  */
1544  int64_t start_time_realtime;
1545 
1546  /**
1547  * The number of frames used for determining the framerate in
1548  * avformat_find_stream_info().
1549  * Demuxing only, set by the caller before avformat_find_stream_info().
1550  */
1551  int fps_probe_size;
1552 
1553  /**
1554  * Error recognition; higher values will detect more errors but may
1555  * misdetect some more or less valid parts as errors.
1556  * Demuxing only, set by the caller before avformat_open_input().
1557  */
1558  int error_recognition;
1559 
1560  /**
1561  * Custom interrupt callbacks for the I/O layer.
1562  *
1563  * demuxing: set by the user before avformat_open_input().
1564  * muxing: set by the user before avformat_write_header()
1565  * (mainly useful for AVFMT_NOFILE formats). The callback
1566  * should also be passed to avio_open2() if it's used to
1567  * open the file.
1568  */
1570 
1571  /**
1572  * Flags to enable debugging.
1573  */
1574  int debug;
1575 #define FF_FDEBUG_TS 0x0001
1576 
1577  /**
1578  * Maximum buffering duration for interleaving.
1579  *
1580  * To ensure all the streams are interleaved correctly,
1581  * av_interleaved_write_frame() will wait until it has at least one packet
1582  * for each stream before actually writing any packets to the output file.
1583  * When some streams are "sparse" (i.e. there are large gaps between
1584  * successive packets), this can result in excessive buffering.
1585  *
1586  * This field specifies the maximum difference between the timestamps of the
1587  * first and the last packet in the muxing queue, above which libavformat
1588  * will output a packet regardless of whether it has queued a packet for all
1589  * the streams.
1590  *
1591  * Muxing only, set by the caller before avformat_write_header().
1592  */
1593  int64_t max_interleave_delta;
1594 
1595  /**
1596  * Allow non-standard and experimental extension
1597  * @see AVCodecContext.strict_std_compliance
1598  */
1600 
1601  /**
1602  * Flags for the user to detect events happening on the file. Flags must
1603  * be cleared by the user once the event has been handled.
1604  * A combination of AVFMT_EVENT_FLAG_*.
1605  */
1606  int event_flags;
1607 #define AVFMT_EVENT_FLAG_METADATA_UPDATED 0x0001 ///< The call resulted in updated metadata.
1608 
1609  /**
1610  * Maximum number of packets to read while waiting for the first timestamp.
1611  * Decoding only.
1612  */
1613  int max_ts_probe;
1614 
1615  /**
1616  * Avoid negative timestamps during muxing.
1617  * Any value of the AVFMT_AVOID_NEG_TS_* constants.
1618  * Note, this only works when using av_interleaved_write_frame. (interleave_packet_per_dts is in use)
1619  * - muxing: Set by user
1620  * - demuxing: unused
1621  */
1622  int avoid_negative_ts;
1623 #define AVFMT_AVOID_NEG_TS_AUTO -1 ///< Enabled when required by target format
1624 #define AVFMT_AVOID_NEG_TS_MAKE_NON_NEGATIVE 1 ///< Shift timestamps so they are non negative
1625 #define AVFMT_AVOID_NEG_TS_MAKE_ZERO 2 ///< Shift timestamps so that they start at 0
1626 
1627  /**
1628  * Transport stream id.
1629  * This will be moved into demuxer private options. Thus no API/ABI compatibility
1630  */
1631  int ts_id;
1633  /**
1634  * Audio preload in microseconds.
1635  * Note, not all formats support this and unpredictable things may happen if it is used when not supported.
1636  * - encoding: Set by user via AVOptions (NO direct access)
1637  * - decoding: unused
1638  */
1639  int audio_preload;
1640 
1641  /**
1642  * Max chunk time in microseconds.
1643  * Note, not all formats support this and unpredictable things may happen if it is used when not supported.
1644  * - encoding: Set by user via AVOptions (NO direct access)
1645  * - decoding: unused
1646  */
1647  int max_chunk_duration;
1648 
1649  /**
1650  * Max chunk size in bytes
1651  * Note, not all formats support this and unpredictable things may happen if it is used when not supported.
1652  * - encoding: Set by user via AVOptions (NO direct access)
1653  * - decoding: unused
1654  */
1655  int max_chunk_size;
1656 
1657  /**
1658  * forces the use of wallclock timestamps as pts/dts of packets
1659  * This has undefined results in the presence of B frames.
1660  * - encoding: unused
1661  * - decoding: Set by user via AVOptions (NO direct access)
1662  */
1664 
1665  /**
1666  * avio flags, used to force AVIO_FLAG_DIRECT.
1667  * - encoding: unused
1668  * - decoding: Set by user via AVOptions (NO direct access)
1669  */
1670  int avio_flags;
1671 
1672  /**
1673  * The duration field can be estimated through various ways, and this field can be used
1674  * to know how the duration was estimated.
1675  * - encoding: unused
1676  * - decoding: Read by user via AVOptions (NO direct access)
1677  */
1679 
1680  /**
1681  * Skip initial bytes when opening stream
1682  * - encoding: unused
1683  * - decoding: Set by user via AVOptions (NO direct access)
1684  */
1685  int64_t skip_initial_bytes;
1686 
1687  /**
1688  * Correct single timestamp overflows
1689  * - encoding: unused
1690  * - decoding: Set by user via AVOptions (NO direct access)
1691  */
1692  unsigned int correct_ts_overflow;
1693 
1694  /**
1695  * Force seeking to any (also non key) frames.
1696  * - encoding: unused
1697  * - decoding: Set by user via AVOptions (NO direct access)
1698  */
1699  int seek2any;
1700 
1701  /**
1702  * Flush the I/O context after each packet.
1703  * - encoding: Set by user via AVOptions (NO direct access)
1704  * - decoding: unused
1705  */
1706  int flush_packets;
1707 
1708  /**
1709  * format probing score.
1710  * The maximal score is AVPROBE_SCORE_MAX, its set when the demuxer probes
1711  * the format.
1712  * - encoding: unused
1713  * - decoding: set by avformat, read by user via av_format_get_probe_score() (NO direct access)
1714  */
1715  int probe_score;
1717  /**
1718  * number of bytes to read maximally to identify format.
1719  * - encoding: unused
1720  * - decoding: set by user through AVOPtions (NO direct access)
1721  */
1722  int format_probesize;
1723 
1724  /**
1725  * ',' separated list of allowed decoders.
1726  * If NULL then all are allowed
1727  * - encoding: unused
1728  * - decoding: set by user through AVOptions (NO direct access)
1729  */
1730  char *codec_whitelist;
1731 
1732  /**
1733  * ',' separated list of allowed demuxers.
1734  * If NULL then all are allowed
1735  * - encoding: unused
1736  * - decoding: set by user through AVOptions (NO direct access)
1737  */
1738  char *format_whitelist;
1739 
1740  /**
1741  * An opaque field for libavformat internal usage.
1742  * Must not be accessed in any way by callers.
1743  */
1744  AVFormatInternal *internal;
1745 
1746  /**
1747  * IO repositioned flag.
1748  * This is set by avformat when the underlaying IO context read pointer
1749  * is repositioned, for example when doing byte based seeking.
1750  * Demuxers can use the flag to detect such changes.
1751  */
1752  int io_repositioned;
1753 
1754  /**
1755  * Forced video codec.
1756  * This allows forcing a specific decoder, even when there are multiple with
1757  * the same codec_id.
1758  * Demuxing: Set by user via av_format_set_video_codec (NO direct access).
1759  */
1761 
1762  /**
1763  * Forced audio codec.
1764  * This allows forcing a specific decoder, even when there are multiple with
1765  * the same codec_id.
1766  * Demuxing: Set by user via av_format_set_audio_codec (NO direct access).
1767  */
1769 
1770  /**
1771  * Forced subtitle codec.
1772  * This allows forcing a specific decoder, even when there are multiple with
1773  * the same codec_id.
1774  * Demuxing: Set by user via av_format_set_subtitle_codec (NO direct access).
1775  */
1777 
1778  /**
1779  * Forced data codec.
1780  * This allows forcing a specific decoder, even when there are multiple with
1781  * the same codec_id.
1782  * Demuxing: Set by user via av_format_set_data_codec (NO direct access).
1783  */
1785 
1786  /**
1787  * Number of bytes to be written as padding in a metadata header.
1788  * Demuxing: Unused.
1789  * Muxing: Set by user via av_format_set_metadata_header_padding.
1790  */
1792 
1793  /**
1794  * User data.
1795  * This is a place for some private data of the user.
1796  */
1797  void *opaque;
1798 
1799  /**
1800  * Callback used by devices to communicate with application.
1801  */
1803 
1804  /**
1805  * Output timestamp offset, in microseconds.
1806  * Muxing: set by user via AVOptions (NO direct access)
1807  */
1808  int64_t output_ts_offset;
1809 
1810  /**
1811  * dump format separator.
1812  * can be ", " or "\n " or anything else
1813  * Code outside libavformat should access this field using AVOptions
1814  * (NO direct access).
1815  * - muxing: Set by user.
1816  * - demuxing: Set by user.
1817  */
1819 
1820  /**
1821  * Forced Data codec_id.
1822  * Demuxing: Set by user.
1823  */
1824  enum AVCodecID data_codec_id;
1825 
1826 #if FF_API_OLD_OPEN_CALLBACKS
1827  /**
1828  * Called to open further IO contexts when needed for demuxing.
1829  *
1830  * This can be set by the user application to perform security checks on
1831  * the URLs before opening them.
1832  * The function should behave like avio_open2(), AVFormatContext is provided
1833  * as contextual information and to reach AVFormatContext.opaque.
1834  *
1835  * If NULL then some simple checks are used together with avio_open2().
1836  *
1837  * Must not be accessed directly from outside avformat.
1838  * @See av_format_set_open_cb()
1839  *
1840  * Demuxing: Set by user.
1841  *
1842  * @deprecated Use io_open and io_close.
1843  */
1845  int (*open_cb)(struct AVFormatContext *s, AVIOContext **p, const char *url, int flags, const AVIOInterruptCB *int_cb, AVDictionary **options);
1846 #endif
1847 
1848  /**
1849  * ',' separated list of allowed protocols.
1850  * - encoding: unused
1851  * - decoding: set by user through AVOptions (NO direct access)
1852  */
1853  char *protocol_whitelist;
1854 
1855  /*
1856  * A callback for opening new IO streams.
1857  *
1858  * Whenever a muxer or a demuxer needs to open an IO stream (typically from
1859  * avformat_open_input() for demuxers, but for certain formats can happen at
1860  * other times as well), it will call this callback to obtain an IO context.
1861  *
1862  * @param s the format context
1863  * @param pb on success, the newly opened IO context should be returned here
1864  * @param url the url to open
1865  * @param flags a combination of AVIO_FLAG_*
1866  * @param options a dictionary of additional options, with the same
1867  * semantics as in avio_open2()
1868  * @return 0 on success, a negative AVERROR code on failure
1869  *
1870  * @note Certain muxers and demuxers do nesting, i.e. they open one or more
1871  * additional internal format contexts. Thus the AVFormatContext pointer
1872  * passed to this callback may be different from the one facing the caller.
1873  * It will, however, have the same 'opaque' field.
1874  */
1875  int (*io_open)(struct AVFormatContext *s, AVIOContext **pb, const char *url,
1876  int flags, AVDictionary **options);
1877 
1878  /**
1879  * A callback for closing the streams opened with AVFormatContext.io_open().
1880  */
1881  void (*io_close)(struct AVFormatContext *s, AVIOContext *pb);
1882 
1883  /**
1884  * ',' separated list of disallowed protocols.
1885  * - encoding: unused
1886  * - decoding: set by user through AVOptions (NO direct access)
1887  */
1888  char *protocol_blacklist;
1889 } AVFormatContext;
1890 
1902 void * av_format_get_opaque(const AVFormatContext *s);
1906 #if FF_API_OLD_OPEN_CALLBACKS
1907 attribute_deprecated AVOpenCallback av_format_get_open_cb(const AVFormatContext *s);
1908 attribute_deprecated void av_format_set_open_cb(AVFormatContext *s, AVOpenCallback callback);
1909 #endif
1910 
1911 /**
1912  * This function will cause global side data to be injected in the next packet
1913  * of each stream as well as after any subsequent seek.
1914  */
1916 
1917 /**
1918  * Returns the method used to set ctx->duration.
1919  *
1920  * @return AVFMT_DURATION_FROM_PTS, AVFMT_DURATION_FROM_STREAM, or AVFMT_DURATION_FROM_BITRATE.
1921  */
1923 
1924 typedef struct AVPacketList {
1925  AVPacket pkt;
1926  struct AVPacketList *next;
1927 } AVPacketList;
1928 
1929 
1930 /**
1931  * @defgroup lavf_core Core functions
1932  * @ingroup libavf
1933  *
1934  * Functions for querying libavformat capabilities, allocating core structures,
1935  * etc.
1936  * @{
1937  */
1938 
1939 /**
1940  * Return the LIBAVFORMAT_VERSION_INT constant.
1941  */
1942 unsigned avformat_version(void);
1943 
1944 /**
1945  * Return the libavformat build-time configuration.
1946  */
1947 const char *avformat_configuration(void);
1948 
1949 /**
1950  * Return the libavformat license.
1951  */
1952 const char *avformat_license(void);
1953 
1954 /**
1955  * Initialize libavformat and register all the muxers, demuxers and
1956  * protocols. If you do not call this function, then you can select
1957  * exactly which formats you want to support.
1958  *
1959  * @see av_register_input_format()
1960  * @see av_register_output_format()
1961  */
1962 void av_register_all(void);
1963 
1966 
1967 /**
1968  * Do global initialization of network components. This is optional,
1969  * but recommended, since it avoids the overhead of implicitly
1970  * doing the setup for each session.
1971  *
1972  * Calling this function will become mandatory if using network
1973  * protocols at some major version bump.
1974  */
1975 int avformat_network_init(void);
1976 
1977 /**
1978  * Undo the initialization done by avformat_network_init.
1979  */
1980 int avformat_network_deinit(void);
1981 
1982 /**
1983  * If f is NULL, returns the first registered input format,
1984  * if f is non-NULL, returns the next registered input format after f
1985  * or NULL if f is the last one.
1986  */
1988 
1989 /**
1990  * If f is NULL, returns the first registered output format,
1991  * if f is non-NULL, returns the next registered output format after f
1992  * or NULL if f is the last one.
1993  */
1995 
1996 /**
1997  * Allocate an AVFormatContext.
1998  * avformat_free_context() can be used to free the context and everything
1999  * allocated by the framework within it.
2000  */
2002 
2003 /**
2004  * Free an AVFormatContext and all its streams.
2005  * @param s context to free
2006  */
2008 
2009 /**
2010  * Get the AVClass for AVFormatContext. It can be used in combination with
2011  * AV_OPT_SEARCH_FAKE_OBJ for examining options.
2012  *
2013  * @see av_opt_find().
2014  */
2015 const AVClass *avformat_get_class(void);
2016 
2017 /**
2018  * Add a new stream to a media file.
2019  *
2020  * When demuxing, it is called by the demuxer in read_header(). If the
2021  * flag AVFMTCTX_NOHEADER is set in s.ctx_flags, then it may also
2022  * be called in read_packet().
2023  *
2024  * When muxing, should be called by the user before avformat_write_header().
2025  *
2026  * User is required to call avcodec_close() and avformat_free_context() to
2027  * clean up the allocation by avformat_new_stream().
2028  *
2029  * @param s media file handle
2030  * @param c If non-NULL, the AVCodecContext corresponding to the new stream
2031  * will be initialized to use this codec. This is needed for e.g. codec-specific
2032  * defaults to be set, so codec should be provided if it is known.
2033  *
2034  * @return newly created stream or NULL on error.
2035  */
2037 
2038 /**
2039  * Allocate new information from stream.
2040  *
2041  * @param stream stream
2042  * @param type desired side information type
2043  * @param size side information size
2044  * @return pointer to fresh allocated data or NULL otherwise
2045  */
2047  enum AVPacketSideDataType type, int size);
2048 /**
2049  * Get side information from stream.
2050  *
2051  * @param stream stream
2052  * @param type desired side information type
2053  * @param size pointer for side information size to store (optional)
2054  * @return pointer to data if present or NULL otherwise
2055  */
2056 #if FF_API_NOCONST_GET_SIDE_DATA
2058  enum AVPacketSideDataType type, int *size);
2059 #else
2061  enum AVPacketSideDataType type, int *size);
2062 #endif
2063 
2065 
2066 /**
2067  * @}
2068  */
2069 
2070 
2071 /**
2072  * Allocate an AVFormatContext for an output format.
2073  * avformat_free_context() can be used to free the context and
2074  * everything allocated by the framework within it.
2075  *
2076  * @param *ctx is set to the created format context, or to NULL in
2077  * case of failure
2078  * @param oformat format to use for allocating the context, if NULL
2079  * format_name and filename are used instead
2080  * @param format_name the name of output format to use for allocating the
2081  * context, if NULL filename is used instead
2082  * @param filename the name of the filename to use for allocating the
2083  * context, may be NULL
2084  * @return >= 0 in case of success, a negative AVERROR code in case of
2085  * failure
2086  */
2088  const char *format_name, const char *filename);
2089 
2090 /**
2091  * @addtogroup lavf_decoding
2092  * @{
2093  */
2094 
2095 /**
2096  * Find AVInputFormat based on the short name of the input format.
2097  */
2098 AVInputFormat *av_find_input_format(const char *short_name);
2099 
2100 /**
2101  * Guess the file format.
2102  *
2103  * @param pd data to be probed
2104  * @param is_opened Whether the file is already opened; determines whether
2105  * demuxers with or without AVFMT_NOFILE are probed.
2106  */
2107 AVInputFormat *av_probe_input_format(AVProbeData *pd, int is_opened);
2108 
2109 /**
2110  * Guess the file format.
2111  *
2112  * @param pd data to be probed
2113  * @param is_opened Whether the file is already opened; determines whether
2114  * demuxers with or without AVFMT_NOFILE are probed.
2115  * @param score_max A probe score larger that this is required to accept a
2116  * detection, the variable is set to the actual detection
2117  * score afterwards.
2118  * If the score is <= AVPROBE_SCORE_MAX / 4 it is recommended
2119  * to retry with a larger probe buffer.
2120  */
2121 AVInputFormat *av_probe_input_format2(AVProbeData *pd, int is_opened, int *score_max);
2122 
2123 /**
2124  * Guess the file format.
2125  *
2126  * @param is_opened Whether the file is already opened; determines whether
2127  * demuxers with or without AVFMT_NOFILE are probed.
2128  * @param score_ret The score of the best detection.
2129  */
2130 AVInputFormat *av_probe_input_format3(AVProbeData *pd, int is_opened, int *score_ret);
2131 
2132 /**
2133  * Probe a bytestream to determine the input format. Each time a probe returns
2134  * with a score that is too low, the probe buffer size is increased and another
2135  * attempt is made. When the maximum probe size is reached, the input format
2136  * with the highest score is returned.
2137  *
2138  * @param pb the bytestream to probe
2139  * @param fmt the input format is put here
2140  * @param url the url of the stream
2141  * @param logctx the log context
2142  * @param offset the offset within the bytestream to probe from
2143  * @param max_probe_size the maximum probe buffer size (zero for default)
2144  * @return the score in case of success, a negative value corresponding to an
2145  * the maximal score is AVPROBE_SCORE_MAX
2146  * AVERROR code otherwise
2147  */
2149  const char *url, void *logctx,
2150  unsigned int offset, unsigned int max_probe_size);
2151 
2152 /**
2153  * Like av_probe_input_buffer2() but returns 0 on success
2154  */
2156  const char *url, void *logctx,
2157  unsigned int offset, unsigned int max_probe_size);
2158 
2159 /**
2160  * Open an input stream and read the header. The codecs are not opened.
2161  * The stream must be closed with avformat_close_input().
2162  *
2163  * @param ps Pointer to user-supplied AVFormatContext (allocated by avformat_alloc_context).
2164  * May be a pointer to NULL, in which case an AVFormatContext is allocated by this
2165  * function and written into ps.
2166  * Note that a user-supplied AVFormatContext will be freed on failure.
2167  * @param url URL of the stream to open.
2168  * @param fmt If non-NULL, this parameter forces a specific input format.
2169  * Otherwise the format is autodetected.
2170  * @param options A dictionary filled with AVFormatContext and demuxer-private options.
2171  * On return this parameter will be destroyed and replaced with a dict containing
2172  * options that were not found. May be NULL.
2173  *
2174  * @return 0 on success, a negative AVERROR on failure.
2175  *
2176  * @note If you want to use custom IO, preallocate the format context and set its pb field.
2177  */
2179 
2182 
2183 /**
2184  * Read packets of a media file to get stream information. This
2185  * is useful for file formats with no headers such as MPEG. This
2186  * function also computes the real framerate in case of MPEG-2 repeat
2187  * frame mode.
2188  * The logical file position is not changed by this function;
2189  * examined packets may be buffered for later processing.
2190  *
2191  * @param ic media file handle
2192  * @param options If non-NULL, an ic.nb_streams long array of pointers to
2193  * dictionaries, where i-th member contains options for
2194  * codec corresponding to i-th stream.
2195  * On return each dictionary will be filled with options that were not found.
2196  * @return >=0 if OK, AVERROR_xxx on error
2197  *
2198  * @note this function isn't guaranteed to open all the codecs, so
2199  * options being non-empty at return is a perfectly normal behavior.
2200  *
2201  * @todo Let the user decide somehow what information is needed so that
2202  * we do not waste time getting stuff the user does not need.
2203  */
2205 
2206 /**
2207  * Find the programs which belong to a given stream.
2208  *
2209  * @param ic media file handle
2210  * @param last the last found program, the search will start after this
2211  * program, or from the beginning if it is NULL
2212  * @param s stream index
2213  * @return the next program which belongs to s, NULL if no program is found or
2214  * the last program is not among the programs of ic.
2215  */
2217 
2218 void av_program_add_stream_index(AVFormatContext *ac, int progid, unsigned int idx);
2219 
2220 /**
2221  * Find the "best" stream in the file.
2222  * The best stream is determined according to various heuristics as the most
2223  * likely to be what the user expects.
2224  * If the decoder parameter is non-NULL, av_find_best_stream will find the
2225  * default decoder for the stream's codec; streams for which no decoder can
2226  * be found are ignored.
2227  *
2228  * @param ic media file handle
2229  * @param type stream type: video, audio, subtitles, etc.
2230  * @param wanted_stream_nb user-requested stream number,
2231  * or -1 for automatic selection
2232  * @param related_stream try to find a stream related (eg. in the same
2233  * program) to this one, or -1 if none
2234  * @param decoder_ret if non-NULL, returns the decoder for the
2235  * selected stream
2236  * @param flags flags; none are currently defined
2237  * @return the non-negative stream number in case of success,
2238  * AVERROR_STREAM_NOT_FOUND if no stream with the requested type
2239  * could be found,
2240  * AVERROR_DECODER_NOT_FOUND if streams were found but no decoder
2241  * @note If av_find_best_stream returns successfully and decoder_ret is not
2242  * NULL, then *decoder_ret is guaranteed to be set to a valid AVCodec.
2243  */
2245  enum AVMediaType type,
2246  int wanted_stream_nb,
2247  int related_stream,
2248  AVCodec **decoder_ret,
2249  int flags);
2250 
2251 /**
2252  * Return the next frame of a stream.
2253  * This function returns what is stored in the file, and does not validate
2254  * that what is there are valid frames for the decoder. It will split what is
2255  * stored in the file into frames and return one for each call. It will not
2256  * omit invalid data between valid frames so as to give the decoder the maximum
2257  * information possible for decoding.
2258  *
2259  * If pkt->buf is NULL, then the packet is valid until the next
2260  * av_read_frame() or until avformat_close_input(). Otherwise the packet
2261  * is valid indefinitely. In both cases the packet must be freed with
2262  * av_packet_unref when it is no longer needed. For video, the packet contains
2263  * exactly one frame. For audio, it contains an integer number of frames if each
2264  * frame has a known fixed size (e.g. PCM or ADPCM data). If the audio frames
2265  * have a variable size (e.g. MPEG audio), then it contains one frame.
2266  *
2267  * pkt->pts, pkt->dts and pkt->duration are always set to correct
2268  * values in AVStream.time_base units (and guessed if the format cannot
2269  * provide them). pkt->pts can be AV_NOPTS_VALUE if the video format
2270  * has B-frames, so it is better to rely on pkt->dts if you do not
2271  * decompress the payload.
2272  *
2273  * @return 0 if OK, < 0 on error or end of file
2274  */
2276 
2277 /**
2278  * Seek to the keyframe at timestamp.
2279  * 'timestamp' in 'stream_index'.
2280  *
2281  * @param s media file handle
2282  * @param stream_index If stream_index is (-1), a default
2283  * stream is selected, and timestamp is automatically converted
2284  * from AV_TIME_BASE units to the stream specific time_base.
2285  * @param timestamp Timestamp in AVStream.time_base units
2286  * or, if no stream is specified, in AV_TIME_BASE units.
2287  * @param flags flags which select direction and seeking mode
2288  * @return >= 0 on success
2289  */
2290 int av_seek_frame(AVFormatContext *s, int stream_index, int64_t timestamp,
2291  int flags);
2292 
2293 /**
2294  * Seek to timestamp ts.
2295  * Seeking will be done so that the point from which all active streams
2296  * can be presented successfully will be closest to ts and within min/max_ts.
2297  * Active streams are all streams that have AVStream.discard < AVDISCARD_ALL.
2298  *
2299  * If flags contain AVSEEK_FLAG_BYTE, then all timestamps are in bytes and
2300  * are the file position (this may not be supported by all demuxers).
2301  * If flags contain AVSEEK_FLAG_FRAME, then all timestamps are in frames
2302  * in the stream with stream_index (this may not be supported by all demuxers).
2303  * Otherwise all timestamps are in units of the stream selected by stream_index
2304  * or if stream_index is -1, in AV_TIME_BASE units.
2305  * If flags contain AVSEEK_FLAG_ANY, then non-keyframes are treated as
2306  * keyframes (this may not be supported by all demuxers).
2307  * If flags contain AVSEEK_FLAG_BACKWARD, it is ignored.
2308  *
2309  * @param s media file handle
2310  * @param stream_index index of the stream which is used as time base reference
2311  * @param min_ts smallest acceptable timestamp
2312  * @param ts target timestamp
2313  * @param max_ts largest acceptable timestamp
2314  * @param flags flags
2315  * @return >=0 on success, error code otherwise
2316  *
2317  * @note This is part of the new seek API which is still under construction.
2318  * Thus do not use this yet. It may change at any time, do not expect
2319  * ABI compatibility yet!
2320  */
2321 int avformat_seek_file(AVFormatContext *s, int stream_index, int64_t min_ts, int64_t ts, int64_t max_ts, int flags);
2322 
2323 /**
2324  * Discard all internally buffered data. This can be useful when dealing with
2325  * discontinuities in the byte stream. Generally works only with formats that
2326  * can resync. This includes headerless formats like MPEG-TS/TS but should also
2327  * work with NUT, Ogg and in a limited way AVI for example.
2328  *
2329  * The set of streams, the detected duration, stream parameters and codecs do
2330  * not change when calling this function. If you want a complete reset, it's
2331  * better to open a new AVFormatContext.
2332  *
2333  * This does not flush the AVIOContext (s->pb). If necessary, call
2334  * avio_flush(s->pb) before calling this function.
2335  *
2336  * @param s media file handle
2337  * @return >=0 on success, error code otherwise
2338  */
2340 
2341 /**
2342  * Start playing a network-based stream (e.g. RTSP stream) at the
2343  * current position.
2344  */
2346 
2347 /**
2348  * Pause a network-based stream (e.g. RTSP stream).
2349  *
2350  * Use av_read_play() to resume it.
2351  */
2353 
2354 /**
2355  * Close an opened input AVFormatContext. Free it and all its contents
2356  * and set *s to NULL.
2357  */
2359 /**
2360  * @}
2361  */
2362 
2363 #define AVSEEK_FLAG_BACKWARD 1 ///< seek backward
2364 #define AVSEEK_FLAG_BYTE 2 ///< seeking based on position in bytes
2365 #define AVSEEK_FLAG_ANY 4 ///< seek to any frame, even non-keyframes
2366 #define AVSEEK_FLAG_FRAME 8 ///< seeking based on frame number
2367 
2368 /**
2369  * @addtogroup lavf_encoding
2370  * @{
2371  */
2372 /**
2373  * Allocate the stream private data and write the stream header to
2374  * an output media file.
2375  *
2376  * @param s Media file handle, must be allocated with avformat_alloc_context().
2377  * Its oformat field must be set to the desired output format;
2378  * Its pb field must be set to an already opened AVIOContext.
2379  * @param options An AVDictionary filled with AVFormatContext and muxer-private options.
2380  * On return this parameter will be destroyed and replaced with a dict containing
2381  * options that were not found. May be NULL.
2382  *
2383  * @return 0 on success, negative AVERROR on failure.
2384  *
2385  * @see av_opt_find, av_dict_set, avio_open, av_oformat_next.
2386  */
2389 
2390 /**
2391  * Write a packet to an output media file.
2392  *
2393  * This function passes the packet directly to the muxer, without any buffering
2394  * or reordering. The caller is responsible for correctly interleaving the
2395  * packets if the format requires it. Callers that want libavformat to handle
2396  * the interleaving should call av_interleaved_write_frame() instead of this
2397  * function.
2398  *
2399  * @param s media file handle
2400  * @param pkt The packet containing the data to be written. Note that unlike
2401  * av_interleaved_write_frame(), this function does not take
2402  * ownership of the packet passed to it (though some muxers may make
2403  * an internal reference to the input packet).
2404  * <br>
2405  * This parameter can be NULL (at any time, not just at the end), in
2406  * order to immediately flush data buffered within the muxer, for
2407  * muxers that buffer up data internally before writing it to the
2408  * output.
2409  * <br>
2410  * Packet's @ref AVPacket.stream_index "stream_index" field must be
2411  * set to the index of the corresponding stream in @ref
2412  * AVFormatContext.streams "s->streams".
2413  * <br>
2414  * The timestamps (@ref AVPacket.pts "pts", @ref AVPacket.dts "dts")
2415  * must be set to correct values in the stream's timebase (unless the
2416  * output format is flagged with the AVFMT_NOTIMESTAMPS flag, then
2417  * they can be set to AV_NOPTS_VALUE).
2418  * The dts for subsequent packets passed to this function must be strictly
2419  * increasing when compared in their respective timebases (unless the
2420  * output format is flagged with the AVFMT_TS_NONSTRICT, then they
2421  * merely have to be nondecreasing). @ref AVPacket.duration
2422  * "duration") should also be set if known.
2423  * @return < 0 on error, = 0 if OK, 1 if flushed and there is no more data to flush
2424  *
2425  * @see av_interleaved_write_frame()
2426  */
2428 
2429 /**
2430  * Write a packet to an output media file ensuring correct interleaving.
2431  *
2432  * This function will buffer the packets internally as needed to make sure the
2433  * packets in the output file are properly interleaved in the order of
2434  * increasing dts. Callers doing their own interleaving should call
2435  * av_write_frame() instead of this function.
2436  *
2437  * Using this function instead of av_write_frame() can give muxers advance
2438  * knowledge of future packets, improving e.g. the behaviour of the mp4
2439  * muxer for VFR content in fragmenting mode.
2440  *
2441  * @param s media file handle
2442  * @param pkt The packet containing the data to be written.
2443  * <br>
2444  * If the packet is reference-counted, this function will take
2445  * ownership of this reference and unreference it later when it sees
2446  * fit.
2447  * The caller must not access the data through this reference after
2448  * this function returns. If the packet is not reference-counted,
2449  * libavformat will make a copy.
2450  * <br>
2451  * This parameter can be NULL (at any time, not just at the end), to
2452  * flush the interleaving queues.
2453  * <br>
2454  * Packet's @ref AVPacket.stream_index "stream_index" field must be
2455  * set to the index of the corresponding stream in @ref
2456  * AVFormatContext.streams "s->streams".
2457  * <br>
2458  * The timestamps (@ref AVPacket.pts "pts", @ref AVPacket.dts "dts")
2459  * must be set to correct values in the stream's timebase (unless the
2460  * output format is flagged with the AVFMT_NOTIMESTAMPS flag, then
2461  * they can be set to AV_NOPTS_VALUE).
2462  * The dts for subsequent packets in one stream must be strictly
2463  * increasing (unless the output format is flagged with the
2464  * AVFMT_TS_NONSTRICT, then they merely have to be nondecreasing).
2465  * @ref AVPacket.duration "duration") should also be set if known.
2466  *
2467  * @return 0 on success, a negative AVERROR on error. Libavformat will always
2468  * take care of freeing the packet, even if this function fails.
2469  *
2470  * @see av_write_frame(), AVFormatContext.max_interleave_delta
2471  */
2473 
2474 /**
2475  * Write an uncoded frame to an output media file.
2476  *
2477  * The frame must be correctly interleaved according to the container
2478  * specification; if not, then av_interleaved_write_frame() must be used.
2479  *
2480  * See av_interleaved_write_frame() for details.
2481  */
2482 int av_write_uncoded_frame(AVFormatContext *s, int stream_index,
2483  AVFrame *frame);
2484 
2485 /**
2486  * Write an uncoded frame to an output media file.
2487  *
2488  * If the muxer supports it, this function makes it possible to write an AVFrame
2489  * structure directly, without encoding it into a packet.
2490  * It is mostly useful for devices and similar special muxers that use raw
2491  * video or PCM data and will not serialize it into a byte stream.
2492  *
2493  * To test whether it is possible to use it with a given muxer and stream,
2494  * use av_write_uncoded_frame_query().
2495  *
2496  * The caller gives up ownership of the frame and must not access it
2497  * afterwards.
2498  *
2499  * @return >=0 for success, a negative code on error
2500  */
2501 int av_interleaved_write_uncoded_frame(AVFormatContext *s, int stream_index,
2502  AVFrame *frame);
2503 
2504 /**
2505  * Test whether a muxer supports uncoded frame.
2506  *
2507  * @return >=0 if an uncoded frame can be written to that muxer and stream,
2508  * <0 if not
2509  */
2510 int av_write_uncoded_frame_query(AVFormatContext *s, int stream_index);
2511 
2512 /**
2513  * Write the stream trailer to an output media file and free the
2514  * file private data.
2515  *
2516  * May only be called after a successful call to avformat_write_header.
2517  *
2518  * @param s media file handle
2519  * @return 0 if OK, AVERROR_xxx on error
2520  */
2522 
2523 /**
2524  * Return the output format in the list of registered output formats
2525  * which best matches the provided parameters, or return NULL if
2526  * there is no match.
2527  *
2528  * @param short_name if non-NULL checks if short_name matches with the
2529  * names of the registered formats
2530  * @param filename if non-NULL checks if filename terminates with the
2531  * extensions of the registered formats
2532  * @param mime_type if non-NULL checks if mime_type matches with the
2533  * MIME type of the registered formats
2534  */
2535 AVOutputFormat *av_guess_format(const char *short_name,
2536  const char *filename,
2537  const char *mime_type);
2538 
2539 /**
2540  * Guess the codec ID based upon muxer and filename.
2541  */
2542 enum AVCodecID av_guess_codec(AVOutputFormat *fmt, const char *short_name,
2543  const char *filename, const char *mime_type,
2544  enum AVMediaType type);
2545 
2546 /**
2547  * Get timing information for the data currently output.
2548  * The exact meaning of "currently output" depends on the format.
2549  * It is mostly relevant for devices that have an internal buffer and/or
2550  * work in real time.
2551  * @param s media file handle
2552  * @param stream stream in the media file
2553  * @param[out] dts DTS of the last packet output for the stream, in stream
2554  * time_base units
2555  * @param[out] wall absolute time when that packet whas output,
2556  * in microsecond
2557  * @return 0 if OK, AVERROR(ENOSYS) if the format does not support it
2558  * Note: some formats or devices may not allow to measure dts and wall
2559  * atomically.
2560  */
2561 int av_get_output_timestamp(struct AVFormatContext *s, int stream,
2562  int64_t *dts, int64_t *wall);
2563 
2564 
2565 /**
2566  * @}
2567  */
2568 
2569 
2570 /**
2571  * @defgroup lavf_misc Utility functions
2572  * @ingroup libavf
2573  * @{
2574  *
2575  * Miscellaneous utility functions related to both muxing and demuxing
2576  * (or neither).
2577  */
2578 
2579 /**
2580  * Send a nice hexadecimal dump of a buffer to the specified file stream.
2581  *
2582  * @param f The file stream pointer where the dump should be sent to.
2583  * @param buf buffer
2584  * @param size buffer size
2585  *
2586  * @see av_hex_dump_log, av_pkt_dump2, av_pkt_dump_log2
2587  */
2588 void av_hex_dump(FILE *f, const uint8_t *buf, int size);
2589 
2590 /**
2591  * Send a nice hexadecimal dump of a buffer to the log.
2592  *
2593  * @param avcl A pointer to an arbitrary struct of which the first field is a
2594  * pointer to an AVClass struct.
2595  * @param level The importance level of the message, lower values signifying
2596  * higher importance.
2597  * @param buf buffer
2598  * @param size buffer size
2599  *
2600  * @see av_hex_dump, av_pkt_dump2, av_pkt_dump_log2
2601  */
2602 void av_hex_dump_log(void *avcl, int level, const uint8_t *buf, int size);
2603 
2604 /**
2605  * Send a nice dump of a packet to the specified file stream.
2606  *
2607  * @param f The file stream pointer where the dump should be sent to.
2608  * @param pkt packet to dump
2609  * @param dump_payload True if the payload must be displayed, too.
2610  * @param st AVStream that the packet belongs to
2611  */
2612 void av_pkt_dump2(FILE *f, const AVPacket *pkt, int dump_payload, const AVStream *st);
2613 
2614 
2615 /**
2616  * Send a nice dump of a packet to the log.
2617  *
2618  * @param avcl A pointer to an arbitrary struct of which the first field is a
2619  * pointer to an AVClass struct.
2620  * @param level The importance level of the message, lower values signifying
2621  * higher importance.
2622  * @param pkt packet to dump
2623  * @param dump_payload True if the payload must be displayed, too.
2624  * @param st AVStream that the packet belongs to
2625  */
2626 void av_pkt_dump_log2(void *avcl, int level, const AVPacket *pkt, int dump_payload,
2627  const AVStream *st);
2628 
2629 /**
2630  * Get the AVCodecID for the given codec tag tag.
2631  * If no codec id is found returns AV_CODEC_ID_NONE.
2632  *
2633  * @param tags list of supported codec_id-codec_tag pairs, as stored
2634  * in AVInputFormat.codec_tag and AVOutputFormat.codec_tag
2635  * @param tag codec tag to match to a codec ID
2636  */
2637 enum AVCodecID av_codec_get_id(const struct AVCodecTag * const *tags, unsigned int tag);
2638 
2639 /**
2640  * Get the codec tag for the given codec id id.
2641  * If no codec tag is found returns 0.
2642  *
2643  * @param tags list of supported codec_id-codec_tag pairs, as stored
2644  * in AVInputFormat.codec_tag and AVOutputFormat.codec_tag
2645  * @param id codec ID to match to a codec tag
2646  */
2647 unsigned int av_codec_get_tag(const struct AVCodecTag * const *tags, enum AVCodecID id);
2648 
2649 /**
2650  * Get the codec tag for the given codec id.
2651  *
2652  * @param tags list of supported codec_id - codec_tag pairs, as stored
2653  * in AVInputFormat.codec_tag and AVOutputFormat.codec_tag
2654  * @param id codec id that should be searched for in the list
2655  * @param tag A pointer to the found tag
2656  * @return 0 if id was not found in tags, > 0 if it was found
2657  */
2658 int av_codec_get_tag2(const struct AVCodecTag * const *tags, enum AVCodecID id,
2659  unsigned int *tag);
2660 
2662 
2663 /**
2664  * Get the index for a specific timestamp.
2665  *
2666  * @param st stream that the timestamp belongs to
2667  * @param timestamp timestamp to retrieve the index for
2668  * @param flags if AVSEEK_FLAG_BACKWARD then the returned index will correspond
2669  * to the timestamp which is <= the requested one, if backward
2670  * is 0, then it will be >=
2671  * if AVSEEK_FLAG_ANY seek to any frame, only keyframes otherwise
2672  * @return < 0 if no such timestamp could be found
2673  */
2674 int av_index_search_timestamp(AVStream *st, int64_t timestamp, int flags);
2675 
2676 /**
2677  * Add an index entry into a sorted list. Update the entry if the list
2678  * already contains it.
2679  *
2680  * @param timestamp timestamp in the time base of the given stream
2681  */
2682 int av_add_index_entry(AVStream *st, int64_t pos, int64_t timestamp,
2683  int size, int distance, int flags);
2684 
2685 
2686 /**
2687  * Split a URL string into components.
2688  *
2689  * The pointers to buffers for storing individual components may be null,
2690  * in order to ignore that component. Buffers for components not found are
2691  * set to empty strings. If the port is not found, it is set to a negative
2692  * value.
2693  *
2694  * @param proto the buffer for the protocol
2695  * @param proto_size the size of the proto buffer
2696  * @param authorization the buffer for the authorization
2697  * @param authorization_size the size of the authorization buffer
2698  * @param hostname the buffer for the host name
2699  * @param hostname_size the size of the hostname buffer
2700  * @param port_ptr a pointer to store the port number in
2701  * @param path the buffer for the path
2702  * @param path_size the size of the path buffer
2703  * @param url the URL to split
2704  */
2705 void av_url_split(char *proto, int proto_size,
2706  char *authorization, int authorization_size,
2707  char *hostname, int hostname_size,
2708  int *port_ptr,
2709  char *path, int path_size,
2710  const char *url);
2711 
2712 
2713 /**
2714  * Print detailed information about the input or output format, such as
2715  * duration, bitrate, streams, container, programs, metadata, side data,
2716  * codec and time base.
2717  *
2718  * @param ic the context to analyze
2719  * @param index index of the stream to dump information about
2720  * @param url the URL to print, such as source or destination file
2721  * @param is_output Select whether the specified context is an input(0) or output(1)
2722  */
2724  int index,
2725  const char *url,
2726  int is_output);
2727 
2728 
2729 #define AV_FRAME_FILENAME_FLAGS_MULTIPLE 1 ///< Allow multiple %d
2730 
2731 /**
2732  * Return in 'buf' the path with '%d' replaced by a number.
2733  *
2734  * Also handles the '%0nd' format where 'n' is the total number
2735  * of digits and '%%'.
2736  *
2737  * @param buf destination buffer
2738  * @param buf_size destination buffer size
2739  * @param path numbered sequence string
2740  * @param number frame number
2741  * @param flags AV_FRAME_FILENAME_FLAGS_*
2742  * @return 0 if OK, -1 on format error
2743  */
2744 int av_get_frame_filename2(char *buf, int buf_size,
2745  const char *path, int number, int flags);
2746 
2747 int av_get_frame_filename(char *buf, int buf_size,
2748  const char *path, int number);
2749 
2750 /**
2751  * Check whether filename actually is a numbered sequence generator.
2752  *
2753  * @param filename possible numbered sequence string
2754  * @return 1 if a valid numbered sequence string, 0 otherwise
2755  */
2756 int av_filename_number_test(const char *filename);
2757 
2758 /**
2759  * Generate an SDP for an RTP session.
2760  *
2761  * Note, this overwrites the id values of AVStreams in the muxer contexts
2762  * for getting unique dynamic payload types.
2763  *
2764  * @param ac array of AVFormatContexts describing the RTP streams. If the
2765  * array is composed by only one context, such context can contain
2766  * multiple AVStreams (one AVStream per RTP stream). Otherwise,
2767  * all the contexts in the array (an AVCodecContext per RTP stream)
2768  * must contain only one AVStream.
2769  * @param n_files number of AVCodecContexts contained in ac
2770  * @param buf buffer where the SDP will be stored (must be allocated by
2771  * the caller)
2772  * @param size the size of the buffer
2773  * @return 0 if OK, AVERROR_xxx on error
2774  */
2775 int av_sdp_create(AVFormatContext *ac[], int n_files, char *buf, int size);
2776 
2777 /**
2778  * Return a positive value if the given filename has one of the given
2779  * extensions, 0 otherwise.
2780  *
2781  * @param filename file name to check against the given extensions
2782  * @param extensions a comma-separated list of filename extensions
2783  */
2784 int av_match_ext(const char *filename, const char *extensions);
2785 
2786 /**
2787  * Test if the given container can store a codec.
2788  *
2789  * @param ofmt container to check for compatibility
2790  * @param codec_id codec to potentially store in container
2791  * @param std_compliance standards compliance level, one of FF_COMPLIANCE_*
2792  *
2793  * @return 1 if codec with ID codec_id can be stored in ofmt, 0 if it cannot.
2794  * A negative number if this information is not available.
2795  */
2797  int std_compliance);
2798 
2799 /**
2800  * @defgroup riff_fourcc RIFF FourCCs
2801  * @{
2802  * Get the tables mapping RIFF FourCCs to libavcodec AVCodecIDs. The tables are
2803  * meant to be passed to av_codec_get_id()/av_codec_get_tag() as in the
2804  * following code:
2805  * @code
2806  * uint32_t tag = MKTAG('H', '2', '6', '4');
2807  * const struct AVCodecTag *table[] = { avformat_get_riff_video_tags(), 0 };
2808  * enum AVCodecID id = av_codec_get_id(table, tag);
2809  * @endcode
2810  */
2811 /**
2812  * @return the table mapping RIFF FourCCs for video to libavcodec AVCodecID.
2813  */
2814 const struct AVCodecTag *avformat_get_riff_video_tags(void);
2815 /**
2816  * @return the table mapping RIFF FourCCs for audio to AVCodecID.
2817  */
2818 const struct AVCodecTag *avformat_get_riff_audio_tags(void);
2819 /**
2820  * @return the table mapping MOV FourCCs for video to libavcodec AVCodecID.
2821  */
2822 const struct AVCodecTag *avformat_get_mov_video_tags(void);
2823 /**
2824  * @return the table mapping MOV FourCCs for audio to AVCodecID.
2825  */
2826 const struct AVCodecTag *avformat_get_mov_audio_tags(void);
2827 
2828 /**
2829  * @}
2830  */
2831 
2832 /**
2833  * Guess the sample aspect ratio of a frame, based on both the stream and the
2834  * frame aspect ratio.
2835  *
2836  * Since the frame aspect ratio is set by the codec but the stream aspect ratio
2837  * is set by the demuxer, these two may not be equal. This function tries to
2838  * return the value that you should use if you would like to display the frame.
2839  *
2840  * Basic logic is to use the stream aspect ratio if it is set to something sane
2841  * otherwise use the frame aspect ratio. This way a container setting, which is
2842  * usually easy to modify can override the coded value in the frames.
2843  *
2844  * @param format the format context which the stream is part of
2845  * @param stream the stream which the frame is part of
2846  * @param frame the frame with the aspect ratio to be determined
2847  * @return the guessed (valid) sample_aspect_ratio, 0/1 if no idea
2848  */
2850 
2851 /**
2852  * Guess the frame rate, based on both the container and codec information.
2853  *
2854  * @param ctx the format context which the stream is part of
2855  * @param stream the stream which the frame is part of
2856  * @param frame the frame for which the frame rate should be determined, may be NULL
2857  * @return the guessed (valid) frame rate, 0/1 if no idea
2858  */
2860 
2861 /**
2862  * Check if the stream st contained in s is matched by the stream specifier
2863  * spec.
2864  *
2865  * See the "stream specifiers" chapter in the documentation for the syntax
2866  * of spec.
2867  *
2868  * @return >0 if st is matched by spec;
2869  * 0 if st is not matched by spec;
2870  * AVERROR code if spec is invalid
2871  *
2872  * @note A stream specifier can match several streams in the format.
2873  */
2875  const char *spec);
2876 
2878 
2879 /**
2880  * Apply a list of bitstream filters to a packet.
2881  *
2882  * @param codec AVCodecContext, usually from an AVStream
2883  * @param pkt the packet to apply filters to. If, on success, the returned
2884  * packet has size == 0 and side_data_elems == 0, it indicates that
2885  * the packet should be dropped
2886  * @param bsfc a NULL-terminated list of filters to apply
2887  * @return >=0 on success;
2888  * AVERROR code on failure
2889  */
2890 #if FF_API_OLD_BSF
2892 int av_apply_bitstream_filters(AVCodecContext *codec, AVPacket *pkt,
2893  AVBitStreamFilterContext *bsfc);
2894 #endif
2895 
2896 /**
2897  * @}
2898  */
2899 
2900 #endif /* AVFORMAT_AVFORMAT_H */
unsigned int nb_chapters
Number of chapters in AVChapter array.
Definition: avformat.h:1530
unsigned int max_index_size
Maximum amount of memory in bytes to use for the index of each stream.
Definition: avformat.h:1511
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:4384
int64_t interleaver_chunk_size
Definition: avformat.h:1101
int64_t probesize
Maximum size of the data read from input for determining the input container format.
Definition: avformat.h:1467
unsigned int packet_size
Definition: avformat.h:1431
int64_t first_dts
Timestamp corresponding to the last dts sync point.
Definition: avformat.h:1049
full parsing and interpolation of timestamps for frames not starting on a packet boundary ...
Definition: avformat.h:810
const char const char void * val
Definition: avisynth_c.h:771
int64_t duration_gcd
Definition: avformat.h:1013
int audio_preload
Audio preload in microseconds.
Definition: avformat.h:1649
const char * s
Definition: avisynth_c.h:768
struct AVStream::@177 * info
Bytestream IO Context.
Definition: avio.h:147
enum AVCodecID codec_id
Definition: ffmpeg_vaapi.c:149
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:107
AVProbeData probe_data
Definition: avformat.h:1072
Buffered I/O operations.
AVPacketSideDataType
Definition: avcodec.h:1351
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:1554
attribute_deprecated int av_demuxer_open(AVFormatContext *ic)
Definition: utils.c:340
char * recommended_encoder_configuration
String containing paris of key and values describing recommended encoder configuration.
Definition: avformat.h:1204
This structure describes decoded (raw) audio or video data.
Definition: frame.h:184
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:761
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:1147
AVIOInterruptCB interrupt_callback
Custom interrupt callbacks for the I/O layer.
Definition: avformat.h:1579
ptrdiff_t const GLvoid * data
Definition: opengl_enc.c:101
static void flush(AVCodecContext *avctx)
int(* init)(struct AVFormatContext *)
Initialize format.
Definition: avformat.h:632
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:1913
int flush_packets
Flush the I/O context after each packet.
Definition: avformat.h:1716
enum AVCodecID id
Definition: mxfenc.c:104
int av_write_frame(AVFormatContext *s, AVPacket *pkt)
Write a packet to an output media file.
Definition: mux.c:880
const char * fmt
Definition: avisynth_c.h:769
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:1688
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:1130
void(* deinit)(struct AVFormatContext *)
Deinitialize format.
Definition: avformat.h:641
const char * filename
Definition: avformat.h:462
int64_t pts_buffer[MAX_REORDER_DELAY+1]
Definition: avformat.h:1074
unsigned int max_picture_buffer
Maximum amount of memory in bytes to use for buffering frames obtained from realtime capture devices...
Definition: avformat.h:1517
int64_t pos
Definition: avformat.h:818
int probe_packets
Number of packets to buffer for codec probing.
Definition: avformat.h:1057
int event_flags
Flags for the user to detect events happening on the stream.
Definition: avformat.h:996
struct FFFrac * priv_pts
Definition: avformat.h:1213
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:4680
enum AVCodecID video_codec
default video codec
Definition: avformat.h:535
int64_t first_discard_sample
If not 0, the first audio sample that should be discarded from the stream.
Definition: avformat.h:1138
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:1162
AVRational sample_aspect_ratio
sample aspect ratio (0 if unknown)
Definition: avformat.h:945
uint8_t * dump_separator
dump format separator.
Definition: avformat.h:1828
int index
stream index in AVFormatContext
Definition: avformat.h:879
int avio_flags
avio flags, used to force AVIO_FLAG_DIRECT.
Definition: avformat.h:1680
AVIndexEntry * index_entries
Only used if the format does not support seeking natively.
Definition: avformat.h:1076
int(* check_bitstream)(struct AVFormatContext *, const AVPacket *pkt)
Set up any necessary bitstream filtering and extract any extra data needed for the global header...
Definition: avformat.h:647
int(* free_device_capabilities)(struct AVFormatContext *s, struct AVDeviceCapabilitiesQuery *caps)
Free device capabilities submodule.
Definition: avformat.h:623
int64_t bit_rate
Total stream bitrate in bit/s, 0 if not available.
Definition: avformat.h:1429
int event_flags
Flags for the user to detect events happening on the file.
Definition: avformat.h:1616
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:1267
void * priv_data
Definition: avformat.h:893
AVInputFormat * av_probe_input_format3(AVProbeData *pd, int is_opened, int *score_ret)
Guess the file format.
Definition: format.c:173
int(* write_packet)(struct AVFormatContext *, AVPacket *pkt)
Write a packet.
Definition: avformat.h:575
AVPacketSideData * side_data
An array of side data that applies to the whole stream (i.e.
Definition: avformat.h:985
static AVPacket pkt
int av_write_uncoded_frame_query(AVFormatContext *s, int stream_index)
Test whether a muxer supports uncoded frame.
Definition: mux.c:1344
int priv_data_size
Size of private data so that it can be allocated in the wrapper.
Definition: avformat.h:713
int ctx_flags
Flags signalling stream properties.
Definition: avformat.h:1376
AVDictionary * metadata
Definition: avformat.h:1288
enum AVCodecID subtitle_codec_id
Forced subtitle codec_id.
Definition: avformat.h:1499
AVCodec.
Definition: avcodec.h:3573
int strict_std_compliance
Allow non-standard and experimental extension.
Definition: avformat.h:1609
This struct describes the properties of an encoded stream.
Definition: avcodec.h:3945
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:150
int64_t last_dts_for_order_check
Internal data to analyze DTS and detect faulty mpeg streams.
Definition: avformat.h:1190
Format I/O context.
Definition: avformat.h:1327
int64_t output_ts_offset
Output timestamp offset, in microseconds.
Definition: avformat.h:1818
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:4703
unsigned int nb_stream_indexes
Definition: avformat.h:1259
int64_t cur_dts
Definition: avformat.h:1050
const struct AVCodecTag * avformat_get_mov_audio_tags(void)
Definition: isom.c:628
Public dictionary API.
int flags
Definition: avformat.h:1256
int(* read_close)(struct AVFormatContext *)
Close the stream.
Definition: avformat.h:744
int flags
can use flags: AVFMT_NOFILE, AVFMT_NEEDNUMBER, AVFMT_GLOBALHEADER, AVFMT_NOTIMESTAMPS, AVFMT_VARIABLE_FPS, AVFMT_NODIMENSIONS, AVFMT_NOSTREAMS, AVFMT_ALLOW_FLUSH, AVFMT_TS_NONSTRICT, AVFMT_TS_NEGATIVE
Definition: avformat.h:543
uint8_t
int stream_identifier
Stream Identifier This is the MPEG-TS stream identifier +1 0 means unknown.
Definition: avformat.h:1099
const struct AVCodecTag * avformat_get_riff_video_tags(void)
Definition: riff.c:534
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:676
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:63
const char * avformat_license(void)
Return the libavformat license.
Definition: utils.c:74
int(* free_device_capabilities)(struct AVFormatContext *s, struct AVDeviceCapabilitiesQuery *caps)
Free device capabilities submodule.
Definition: avformat.h:800
AVPacket pkt
Definition: avformat.h:1935
int priv_data_size
size of private data so that it can be allocated in the wrapper
Definition: avformat.h:565
The exact value of the fractional number is: 'val + num / den'.
Definition: internal.h:61
int id
unique ID to identify the chapter
Definition: avformat.h:1285
enum AVStreamParseType need_parsing
Definition: avformat.h:1065
int id
Format-specific stream ID.
Definition: avformat.h:885
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:4724
int duration_count
Definition: avformat.h:1014
int nb_side_data
The number of elements in the AVStream.side_data array.
Definition: avformat.h:989
AVDurationEstimationMethod
The duration of a video can be estimated through various ways, and this enum can be used to know how ...
Definition: avformat.h:1305
AVStream * avformat_new_stream(AVFormatContext *s, const AVCodec *c)
Add a new stream to a media file.
Definition: utils.c:4137
int pmt_pid
Definition: avformat.h:1263
uint8_t * av_stream_get_side_data(const AVStream *stream, enum AVPacketSideDataType type, int *size)
Get side information from stream.
Definition: utils.c:5021
AVStream ** streams
A list of all streams in the file.
Definition: avformat.h:1395
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:132
int inject_global_side_data
Internal data to inject global side data.
Definition: avformat.h:1197
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:112
const char * avformat_configuration(void)
Return the libavformat build-time configuration.
Definition: utils.c:69
#define MAX_REORDER_DELAY
Definition: avformat.h:1073
const AVClass * priv_class
AVClass for the private context.
Definition: avformat.h:687
int64_t last_duration
Definition: avformat.h:1027
int flags
Flags modifying the (de)muxer behaviour.
Definition: avformat.h:1438
AVProgram * av_new_program(AVFormatContext *s, int id)
Definition: utils.c:4233
char * protocol_whitelist
',' separated list of allowed protocols.
Definition: avformat.h:1863
int(* read_header)(struct AVFormatContext *)
Read the format header and initialize the AVFormatContext structure.
Definition: avformat.h:727
int64_t max_interleave_delta
Maximum buffering duration for interleaving.
Definition: avformat.h:1603
uint32_t tag
Definition: movenc.c:1376
int avformat_network_init(void)
Do global initialization of network components.
Definition: utils.c:4615
const struct AVCodecTag * avformat_get_riff_audio_tags(void)
Definition: riff.c:539
int fps_probe_size
The number of frames used for determining the framerate in avformat_find_stream_info().
Definition: avformat.h:1561
int av_sdp_create(AVFormatContext *ac[], int n_files, char *buf, int size)
Generate an SDP for an RTP session.
Definition: sdp.c:827
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:260
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:85
const AVClass * avformat_get_class(void)
Get the AVClass for AVFormatContext.
Definition: options.c:155
ptrdiff_t size
Definition: opengl_enc.c:101
int av_probe_input_buffer2(AVIOContext *pb, AVInputFormat **fmt, const char *url, void *logctx, unsigned int offset, unsigned int max_probe_size)
Probe a bytestream to determine the input format.
Definition: format.c:266
enum AVDiscard discard
selects which program to discard and which to feed to the caller
Definition: avformat.h:1257
const OptionDef options[]
Definition: ffserver.c:3969
unsigned int * stream_index
Definition: avformat.h:1258
AVCodec * av_format_get_audio_codec(const AVFormatContext *s)
enum AVCodecID video_codec_id
Forced video codec_id.
Definition: avformat.h:1487
full parsing and repack with timestamp and position generation by parser for raw this assumes that ea...
Definition: avformat.h:812
int64_t rfps_duration_sum
Definition: avformat.h:1015
Duration estimated from bitrate (less accurate)
Definition: avformat.h:1308
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:270
unsigned int correct_ts_overflow
Correct single timestamp overflows.
Definition: avformat.h:1702
struct AVOutputFormat * oformat
The output container format.
Definition: avformat.h:1346
int64_t start_time
Definition: avformat.h:1273
const struct AVCodecTag * avformat_get_mov_video_tags(void)
Definition: isom.c:623
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:511
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:3878
int av_probe_input_buffer(AVIOContext *pb, AVInputFormat **fmt, const char *url, void *logctx, unsigned int offset, unsigned int max_probe_size)
Like av_probe_input_buffer2() but returns 0 on success.
Definition: format.c:364
int(* write_uncoded_frame)(struct AVFormatContext *, int stream_index, AVFrame **frame, unsigned flags)
Write an uncoded AVFrame.
Definition: avformat.h:607
AVProgram * av_find_program_from_stream(AVFormatContext *ic, AVProgram *last, int s)
Find the programs which belong to a given stream.
Definition: utils.c:3861
int max_ts_probe
Maximum number of packets to read while waiting for the first timestamp.
Definition: avformat.h:1623
int format_probesize
number of bytes to read maximally to identify format.
Definition: avformat.h:1732
AVCodecID
Identify the syntax and semantics of the bitstream.
Definition: avcodec.h:191
AVDictionary * metadata
Metadata that applies to the whole file.
Definition: avformat.h:1541
int nb_decoded_frames
Number of internally decoded frames, used internally in libavformat, do not access its lifetime diffe...
Definition: avformat.h:1151
int av_index_search_timestamp(AVStream *st, int64_t timestamp, int flags)
Get the index for a specific timestamp.
Definition: utils.c:2012
const AVIOInterruptCB int_cb
Definition: ffmpeg.c:457
int(* read_probe)(AVProbeData *)
Tell if a given file has a chance of being parsed as this format.
Definition: avformat.h:720
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:73
int64_t pts_wrap_reference
reference dts for wrap detection
Definition: avformat.h:1276
const char * long_name
Descriptive name for the format, meant to be more human-readable than name.
Definition: avformat.h:530
int64_t timestamp
Timestamp in AVStream.time_base units, preferably the time from which on correctly decoded frames are...
Definition: avformat.h:819
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:589
AVCodec * av_format_get_subtitle_codec(const AVFormatContext *s)
int(* write_header)(struct AVFormatContext *)
Definition: avformat.h:567
const char * r
Definition: vf_curves.c:111
struct AVCodecParserContext * av_stream_get_parser(const AVStream *s)
Definition: utils.c:130
unsigned int nb_programs
Definition: avformat.h:1480
int last_IP_duration
Definition: avformat.h:1052
int av_read_play(AVFormatContext *s)
Start playing a network-based stream (e.g.
Definition: utils.c:3942
AVChapter ** chapters
Definition: avformat.h:1531
int skip_samples
Number of samples to skip at the start of the frame decoded from the next packet. ...
Definition: avformat.h:1121
static const uint8_t offset[127][2]
Definition: vf_spp.c:92
AVRational avg_frame_rate
Average framerate.
Definition: avformat.h:956
New fields can be added to the end with minor version bumps.
Definition: avformat.h:1254
AVInputFormat * av_probe_input_format2(AVProbeData *pd, int is_opened, int *score_max)
Guess the file format.
Definition: format.c:249
int min_distance
Minimum distance between this and the previous keyframe, used to avoid unneeded searching.
Definition: avformat.h:828
int program_num
Definition: avformat.h:1262
AVCodec * audio_codec
Forced audio codec.
Definition: avformat.h:1778
void * opaque
User data.
Definition: avformat.h:1807
Only parse headers, do not repack.
Definition: avformat.h:809
char * format_whitelist
',' separated list of allowed demuxers.
Definition: avformat.h:1748
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:4597
static float distance(float x, float y, int band)
const char * mime_type
mime_type, when known.
Definition: avformat.h:465
int buf_size
Size of buf except extra allocated bytes.
Definition: avformat.h:464
unsigned char * buf
Buffer must have AVPROBE_PADDING_SIZE of extra allocated bytes filled with zero.
Definition: avformat.h:463
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:135
unsigned int nb_streams
Number of elements in AVFormatContext.streams.
Definition: avformat.h:1383
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:1032
int av_read_pause(AVFormatContext *s)
Pause a network-based stream (e.g.
Definition: utils.c:3951
AVInputFormat * av_find_input_format(const char *short_name)
Find AVInputFormat based on the short name of the input format.
Definition: format.c:164
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:1403
int update_initial_durations_done
Internal data to prevent doing update_initial_durations() twice.
Definition: avformat.h:1179
av_warn_unused_result 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:496
void av_program_add_stream_index(AVFormatContext *ac, int progid, unsigned int idx)
enum AVCodecID audio_codec_id
Forced audio codec_id.
Definition: avformat.h:1493
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:133
typedef void(APIENTRY *FF_PFNGLACTIVETEXTUREPROC)(GLenum texture)
int av_find_default_stream_index(AVFormatContext *s)
Definition: utils.c:1754
void av_format_set_opaque(AVFormatContext *s, void *opaque)
const char * name
Definition: avformat.h:524
Duration estimated from a stream with a known duration.
Definition: avformat.h:1307
AVFormatContext * ctx
Definition: movenc.c:48
uint8_t dts_ordered
Definition: avformat.h:1191
int avoid_negative_ts
Avoid negative timestamps during muxing.
Definition: avformat.h:1632
int(* control_message)(struct AVFormatContext *s, int type, void *data, size_t data_size)
Allows sending messages from application to device.
Definition: avformat.h:596
AVDictionary * metadata
Definition: avformat.h:947
uint8_t * av_stream_new_side_data(AVStream *stream, enum AVPacketSideDataType type, int size)
Allocate new information from stream.
Definition: utils.c:5037
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:98
int probe_score
format probing score.
Definition: avformat.h:1725
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:1695
void(* get_output_timestamp)(struct AVFormatContext *s, int stream, int64_t *dts, int64_t *wall)
Definition: avformat.h:591
int(* read_pause)(struct AVFormatContext *)
Pause playing - only meaningful if using a network-based format (RTSP).
Definition: avformat.h:774
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:552
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:1475
int(* get_device_list)(struct AVFormatContext *s, struct AVDeviceInfoList *device_list)
Returns device list with it properties.
Definition: avformat.h:613
int av_get_frame_filename(char *buf, int buf_size, const char *path, int number)
Definition: utils.c:4379
uint8_t pts_reorder_error_count[MAX_REORDER_DELAY+1]
Definition: avformat.h:1185
int ts_id
Transport stream id.
Definition: avformat.h:1641
const char * long_name
Descriptive name for the format, meant to be more human-readable than name.
Definition: avformat.h:669
int metadata_header_padding
Number of bytes to be written as padding in a metadata header.
Definition: avformat.h:1801
int av_format_get_probe_score(const AVFormatContext *s)
Definition: utils.c:189
Stream structure.
Definition: avformat.h:878
int(* create_device_capabilities)(struct AVFormatContext *s, struct AVDeviceCapabilitiesQuery *caps)
Initialize device capabilities submodule.
Definition: avformat.h:618
int64_t end
chapter start/end time in time_base units
Definition: avformat.h:1287
int avformat_queue_attached_pictures(AVFormatContext *s)
Definition: utils.c:420
void av_register_output_format(AVOutputFormat *format)
Definition: format.c:73
int avformat_network_deinit(void)
Undo the initialization done by avformat_network_init.
Definition: utils.c:4628
uint8_t dts_misordered
Definition: avformat.h:1192
int64_t pts_reorder_error[MAX_REORDER_DELAY+1]
Internal data to generate dts from pts.
Definition: avformat.h:1184
int64_t end_time
Definition: avformat.h:1274
Libavcodec external API header.
struct AVOutputFormat * next
Definition: avformat.h:561
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:754
int debug
Flags to enable debugging.
Definition: avformat.h:1584
AVIOContext * pb
I/O context.
Definition: avformat.h:1369
const struct AVCodecTag *const * codec_tag
List of supported codec_id-codec_tag pairs, ordered by "better choice first".
Definition: avformat.h:549
main external API structure.
Definition: avcodec.h:1659
int io_repositioned
IO repositioned flag.
Definition: avformat.h:1762
int av_filename_number_test(const char *filename)
Check whether filename actually is a numbered sequence generator.
Definition: utils.c:277
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:738
int av_get_frame_filename2(char *buf, int buf_size, const char *path, int number, int flags)
Return in 'buf' the path with 'd' replaced by a number.
Definition: utils.c:4324
int pts_wrap_behavior
behavior on wrap detection
Definition: avformat.h:1277
void * buf
Definition: avisynth_c.h:690
double(* duration_error)[2][MAX_STD_TIMEBASES]
Definition: avformat.h:1016
GLint GLenum type
Definition: opengl_enc.c:105
int nb_index_entries
Definition: avformat.h:1078
static const char * format
Definition: movenc.c:47
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:794
enum AVCodecID subtitle_codec
default subtitle codec
Definition: avformat.h:536
Rational number (pair of numerator and denominator).
Definition: rational.h:58
int64_t last_dts
Definition: avformat.h:1012
AVRational display_aspect_ratio
display aspect ratio (0 if unknown)
Definition: avformat.h:1211
AVRational av_stream_get_r_frame_rate(const AVStream *s)
const AVClass * av_class
A class for logging and AVOptions.
Definition: avformat.h:1332
AVMediaType
Definition: avutil.h:193
int(* interleave_packet)(struct AVFormatContext *, AVPacket *out, AVPacket *in, int flush)
Currently only used to set pixel format if not YUV420P.
Definition: avformat.h:580
int64_t fps_last_dts
Definition: avformat.h:1034
int found_decoder
0 -> decoder has not been searched for yet.
Definition: avformat.h:1025
void avformat_free_context(AVFormatContext *s)
Free an AVFormatContext and all its streams.
Definition: utils.c:4073
This structure contains the data a format has to probe a file.
Definition: avformat.h:461
int av_read_frame(AVFormatContext *s, AVPacket *pkt)
Return the next frame of a stream.
Definition: utils.c:1644
List of devices.
Definition: avdevice.h:461
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:2393
int seek2any
Force seeking to any (also non key) frames.
Definition: avformat.h:1709
full parsing and repack of the first frame only, only implemented for H.264 currently ...
Definition: avformat.h:811
int raw_codec_id
Raw demuxers store their codec ID here.
Definition: avformat.h:708
AVDictionary * metadata
Definition: avformat.h:1260
int64_t codec_info_duration
Definition: avformat.h:1017
static int64_t pts
Global timestamp for the audio frames.
int fps_first_dts_idx
Definition: avformat.h:1033
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:1412
const char * mime_type
Comma-separated list of mime types.
Definition: avformat.h:694
uint8_t level
Definition: svq3.c:206
#define attribute_deprecated
Definition: attributes.h:94
Duration accurately estimated from PTSes.
Definition: avformat.h:1306
#define av_warn_unused_result
Definition: attributes.h:56
int av_seek_frame(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
Seek to the keyframe at timestamp.
Definition: utils.c:2370
int64_t start
Definition: avformat.h:1287
int64_t duration
Decoding: duration of the stream, in stream time base.
Definition: avformat.h:932
int64_t interleaver_chunk_duration
Definition: avformat.h:1102
const char * extensions
If extensions are defined, then no probe is done.
Definition: avformat.h:683
const uint8_t * key
Definition: avformat.h:1477
full parsing and repack
Definition: avformat.h:808
int av_interleaved_write_uncoded_frame(AVFormatContext *s, int stream_index, AVFrame *frame)
Write an uncoded frame to an output media file.
Definition: mux.c:1338
struct AVPacketList * next
Definition: avformat.h:1936
int pts_wrap_behavior
Options for behavior, when a wrap is detected.
Definition: avformat.h:1174
int(* read_play)(struct AVFormatContext *)
Start/resume playing - only meaningful if using a network-based format (RTSP).
Definition: avformat.h:768
enum AVCodecID data_codec
default data codec
Definition: avformat.h:624
int avformat_find_stream_info(AVFormatContext *ic, AVDictionary **options)
Read packets of a media file to get stream information.
Definition: utils.c:3283
int64_t start_time
Decoding: pts of the first frame of the stream in presentation order, in stream time base...
Definition: avformat.h:925
AVCodec * video_codec
Forced video codec.
Definition: avformat.h:1770
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:1665
int error_recognition
Error recognition; higher values will detect more errors but may misdetect some more or less valid pa...
Definition: avformat.h:1568
int disposition
AV_DISPOSITION_* bit field.
Definition: avformat.h:936
AVStreamParseType
Definition: avformat.h:806
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:1295
int pts_wrap_bits
number of bits in pts (used for wrapping control)
Definition: avformat.h:1039
AVRational time_base
time base in which the start/end timestamps are specified
Definition: avformat.h:1286
av_format_control_message control_message_cb
Callback used by devices to communicate with application.
Definition: avformat.h:1812
int64_t nb_frames
number of frames in this stream if known or 0
Definition: avformat.h:934
struct AVInputFormat * iformat
The input container format.
Definition: avformat.h:1339
void avformat_close_input(AVFormatContext **s)
Close an opened input AVFormatContext.
Definition: utils.c:4109
int av_write_uncoded_frame(AVFormatContext *s, int stream_index, AVFrame *frame)
Write an uncoded frame to an output media file.
Definition: mux.c:1332
int64_t codec_info_duration_fields
Definition: avformat.h:1018
unsigned int index_entries_allocated_size
Definition: avformat.h:1079
int64_t mux_ts_offset
Timestamp offset added to timestamps before muxing NOT PART OF PUBLIC API.
Definition: avformat.h:1157
int skip_to_keyframe
Indicates that everything up to the next keyframe should be discarded.
Definition: avformat.h:1116
enum AVCodecID data_codec_id
Forced Data codec_id.
Definition: avformat.h:1834
AVCodec * subtitle_codec
Forced subtitle codec.
Definition: avformat.h:1786
int(* AVOpenCallback)(struct AVFormatContext *s, AVIOContext **pb, const char *url, int flags, const AVIOInterruptCB *int_cb, AVDictionary **options)
Definition: avformat.h:1298
AVCodec * data_codec
Forced data codec.
Definition: avformat.h:1794
enum AVCodecID audio_codec
default audio codec
Definition: avformat.h:534
char * codec_whitelist
',' separated list of allowed decoders.
Definition: avformat.h:1740
int(* get_device_list)(struct AVFormatContext *s, struct AVDeviceInfoList *device_list)
Returns device list with it properties.
Definition: avformat.h:788
int max_chunk_duration
Max chunk time in microseconds.
Definition: avformat.h:1657
struct AVCodecParserContext * parser
Definition: avformat.h:1066
void * priv_data
Format private data.
Definition: avformat.h:1355
int pcr_pid
Definition: avformat.h:1264
int codec_info_nb_frames
Number of frames that have been demuxed during av_find_stream_info()
Definition: avformat.h:1062
void av_format_set_control_message_cb(AVFormatContext *s, av_format_control_message callback)
int avformat_open_input(AVFormatContext **ps, const char *url, AVInputFormat *fmt, AVDictionary **options)
Open an input stream and read the header.
Definition: utils.c:471
AVDiscard
Definition: avcodec.h:777
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:1209
char * protocol_blacklist
',' separated list of disallowed protocols.
Definition: avformat.h:1898
int64_t duration
Duration of the stream, in AV_TIME_BASE fractional seconds.
Definition: avformat.h:1422
int avformat_flush(AVFormatContext *s)
Discard all internally buffered data.
Definition: utils.c:2449
void av_format_set_metadata_header_padding(AVFormatContext *s, int c)
FILE * out
Definition: movenc.c:54
int64_t last_IP_pts
Definition: avformat.h:1051
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:782
const char * name
A comma separated list of short names for the format.
Definition: avformat.h:662
AVCodecParameters * codecpar
Definition: avformat.h:1230
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:78
int fps_last_dts_idx
Definition: avformat.h:1035
AVRational time_base
This is the fundamental unit of time (in seconds) in terms of which frame timestamps are represented...
Definition: avformat.h:915
struct AVInputFormat * next
Definition: avformat.h:703
AVCodec * av_format_get_data_codec(const AVFormatContext *s)
#define MKTAG(a, b, c, d)
Definition: common.h:342
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:532
enum AVDiscard discard
Selects which packets can be discarded at will and do not need to be demuxed.
Definition: avformat.h:938
AVRational r_frame_rate
Real base framerate of the stream.
Definition: avformat.h:1092
int(* io_open)(struct AVFormatContext *s, AVIOContext **pb, const char *url, int flags, AVDictionary **options)
Definition: avformat.h:1885
AVInputFormat * av_probe_input_format(AVProbeData *pd, int is_opened)
Guess the file format.
Definition: format.c:260
const char * mime_type
Definition: avformat.h:531
int request_probe
stream probing state -1 -> probing finished 0 -> no probing requested rest -> perform probing with re...
Definition: avformat.h:1111
Following API allows user to probe device capabilities (supported codecs, pixel formats, sample formats, resolutions, channel counts, etc).
Definition: avdevice.h:401
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:1673
This structure stores compressed data.
Definition: avcodec.h:1567
void av_register_all(void)
Initialize libavformat and register all the muxers, demuxers and protocols.
Definition: allformats.c:44
int(* write_trailer)(struct AVFormatContext *)
Definition: avformat.h:576
void(* io_close)(struct AVFormatContext *s, AVIOContext *pb)
A callback for closing the streams opened with AVFormatContext.io_open().
Definition: avformat.h:1891
#define MAX_STD_TIMEBASES
Stream information used internally by av_find_stream_info()
Definition: avformat.h:1010
const struct AVCodecTag *const * codec_tag
Definition: avformat.h:685
int64_t av_stream_get_end_pts(const AVStream *st)
Returns the pts of the last muxed packet + its duration.
Definition: utils.c:122
AVPacket attached_pic
For streams with AV_DISPOSITION_ATTACHED_PIC disposition, this packet will contain the attached pictu...
Definition: avformat.h:965
struct AVPacketList * last_in_packet_buffer
last packet in packet_buffer for this stream when muxing.
Definition: avformat.h:1071
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:1145
AVProgram ** programs
Definition: avformat.h:1481