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avformat.h
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1 /*
2  * copyright (c) 2001 Fabrice Bellard
3  *
4  * This file is part of FFmpeg.
5  *
6  * FFmpeg is free software; you can redistribute it and/or
7  * modify it under the terms of the GNU Lesser General Public
8  * License as published by the Free Software Foundation; either
9  * version 2.1 of the License, or (at your option) any later version.
10  *
11  * FFmpeg is distributed in the hope that it will be useful,
12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14  * Lesser General Public License for more details.
15  *
16  * You should have received a copy of the GNU Lesser General Public
17  * License along with FFmpeg; if not, write to the Free Software
18  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19  */
20 
21 #ifndef AVFORMAT_AVFORMAT_H
22 #define AVFORMAT_AVFORMAT_H
23 
24 /**
25  * @file
26  * @ingroup libavf
27  * Main libavformat public API header
28  */
29 
30 /**
31  * @defgroup libavf I/O and Muxing/Demuxing Library
32  * @{
33  *
34  * Libavformat (lavf) is a library for dealing with various media container
35  * formats. Its main two purposes are demuxing - i.e. splitting a media file
36  * into component streams, and the reverse process of muxing - writing supplied
37  * data in a specified container format. It also has an @ref lavf_io
38  * "I/O module" which supports a number of protocols for accessing the data (e.g.
39  * file, tcp, http and others). Before using lavf, you need to call
40  * av_register_all() to register all compiled muxers, demuxers and protocols.
41  * Unless you are absolutely sure you won't use libavformat's network
42  * capabilities, you should also call avformat_network_init().
43  *
44  * A supported input format is described by an AVInputFormat struct, conversely
45  * an output format is described by AVOutputFormat. You can iterate over all
46  * registered input/output formats using the av_iformat_next() /
47  * av_oformat_next() functions. The protocols layer is not part of the public
48  * API, so you can only get the names of supported protocols with the
49  * avio_enum_protocols() function.
50  *
51  * Main lavf structure used for both muxing and demuxing is AVFormatContext,
52  * which exports all information about the file being read or written. As with
53  * most Libavformat structures, its size is not part of public ABI, so it cannot be
54  * allocated on stack or directly with av_malloc(). To create an
55  * AVFormatContext, use avformat_alloc_context() (some functions, like
56  * avformat_open_input() might do that for you).
57  *
58  * Most importantly an AVFormatContext contains:
59  * @li the @ref AVFormatContext.iformat "input" or @ref AVFormatContext.oformat
60  * "output" format. It is either autodetected or set by user for input;
61  * always set by user for output.
62  * @li an @ref AVFormatContext.streams "array" of AVStreams, which describe all
63  * elementary streams stored in the file. AVStreams are typically referred to
64  * using their index in this array.
65  * @li an @ref AVFormatContext.pb "I/O context". It is either opened by lavf or
66  * set by user for input, always set by user for output (unless you are dealing
67  * with an AVFMT_NOFILE format).
68  *
69  * @section lavf_options Passing options to (de)muxers
70  * Lavf allows to configure muxers and demuxers using the @ref avoptions
71  * mechanism. Generic (format-independent) libavformat options are provided by
72  * AVFormatContext, they can be examined from a user program by calling
73  * av_opt_next() / av_opt_find() on an allocated AVFormatContext (or its AVClass
74  * from avformat_get_class()). Private (format-specific) options are provided by
75  * AVFormatContext.priv_data if and only if AVInputFormat.priv_class /
76  * AVOutputFormat.priv_class of the corresponding format struct is non-NULL.
77  * Further options may be provided by the @ref AVFormatContext.pb "I/O context",
78  * if its AVClass is non-NULL, and the protocols layer. See the discussion on
79  * nesting in @ref avoptions documentation to learn how to access those.
80  *
81  * @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  * @defgroup lavf_decoding Demuxing
94  * @{
95  * Demuxers read a media file and split it into chunks of data (@em packets). A
96  * @ref AVPacket "packet" contains one or more encoded frames which belongs to a
97  * single elementary stream. In the lavf API this process is represented by the
98  * avformat_open_input() function for opening a file, av_read_frame() for
99  * reading a single packet and finally avformat_close_input(), which does the
100  * cleanup.
101  *
102  * @section lavf_decoding_open Opening a media file
103  * The minimum information required to open a file is its URL, which
104  * is passed to avformat_open_input(), as in the following code:
105  * @code
106  * const char *url = "file:in.mp3";
107  * AVFormatContext *s = NULL;
108  * int ret = avformat_open_input(&s, url, NULL, NULL);
109  * if (ret < 0)
110  * abort();
111  * @endcode
112  * The above code attempts to allocate an AVFormatContext, open the
113  * specified file (autodetecting the format) and read the header, exporting the
114  * information stored there into s. Some formats do not have a header or do not
115  * store enough information there, so it is recommended that you call the
116  * avformat_find_stream_info() function which tries to read and decode a few
117  * frames to find missing information.
118  *
119  * In some cases you might want to preallocate an AVFormatContext yourself with
120  * avformat_alloc_context() and do some tweaking on it before passing it to
121  * avformat_open_input(). One such case is when you want to use custom functions
122  * for reading input data instead of lavf internal I/O layer.
123  * To do that, create your own AVIOContext with avio_alloc_context(), passing
124  * your reading callbacks to it. Then set the @em pb field of your
125  * AVFormatContext to newly created AVIOContext.
126  *
127  * Since the format of the opened file is in general not known until after
128  * avformat_open_input() has returned, it is not possible to set demuxer private
129  * options on a preallocated context. Instead, the options should be passed to
130  * avformat_open_input() wrapped in an AVDictionary:
131  * @code
132  * AVDictionary *options = NULL;
133  * av_dict_set(&options, "video_size", "640x480", 0);
134  * av_dict_set(&options, "pixel_format", "rgb24", 0);
135  *
136  * if (avformat_open_input(&s, url, NULL, &options) < 0)
137  * abort();
138  * av_dict_free(&options);
139  * @endcode
140  * This code passes the private options 'video_size' and 'pixel_format' to the
141  * demuxer. They would be necessary for e.g. the rawvideo demuxer, since it
142  * cannot know how to interpret raw video data otherwise. If the format turns
143  * out to be something different than raw video, those options will not be
144  * recognized by the demuxer and therefore will not be applied. Such unrecognized
145  * options are then returned in the options dictionary (recognized options are
146  * consumed). The calling program can handle such unrecognized options as it
147  * wishes, e.g.
148  * @code
149  * AVDictionaryEntry *e;
150  * if (e = av_dict_get(options, "", NULL, AV_DICT_IGNORE_SUFFIX)) {
151  * fprintf(stderr, "Option %s not recognized by the demuxer.\n", e->key);
152  * abort();
153  * }
154  * @endcode
155  *
156  * After you have finished reading the file, you must close it with
157  * avformat_close_input(). It will free everything associated with the file.
158  *
159  * @section lavf_decoding_read Reading from an opened file
160  * Reading data from an opened AVFormatContext is done by repeatedly calling
161  * av_read_frame() on it. Each call, if successful, will return an AVPacket
162  * containing encoded data for one AVStream, identified by
163  * AVPacket.stream_index. This packet may be passed straight into the libavcodec
164  * decoding functions avcodec_decode_video2(), avcodec_decode_audio4() or
165  * avcodec_decode_subtitle2() if the caller wishes to decode the data.
166  *
167  * AVPacket.pts, AVPacket.dts and AVPacket.duration timing information will be
168  * set if known. They may also be unset (i.e. AV_NOPTS_VALUE for
169  * pts/dts, 0 for duration) if the stream does not provide them. The timing
170  * information will be in AVStream.time_base units, i.e. it has to be
171  * multiplied by the timebase to convert them to seconds.
172  *
173  * If AVPacket.buf is set on the returned packet, then the packet is
174  * allocated dynamically and the user may keep it indefinitely.
175  * Otherwise, if AVPacket.buf is NULL, the packet data is backed by a
176  * static storage somewhere inside the demuxer and the packet is only valid
177  * until the next av_read_frame() call or closing the file. If the caller
178  * requires a longer lifetime, av_dup_packet() will make an av_malloc()ed copy
179  * of it.
180  * In both cases, the packet must be freed with av_free_packet() when it is no
181  * longer needed.
182  *
183  * @section lavf_decoding_seek Seeking
184  * @}
185  *
186  * @defgroup lavf_encoding Muxing
187  * @{
188  * Muxers take encoded data in the form of @ref AVPacket "AVPackets" and write
189  * it into files or other output bytestreams in the specified container format.
190  *
191  * The main API functions for muxing are avformat_write_header() for writing the
192  * file header, av_write_frame() / av_interleaved_write_frame() for writing the
193  * packets and av_write_trailer() for finalizing the file.
194  *
195  * At the beginning of the muxing process, the caller must first call
196  * avformat_alloc_context() to create a muxing context. The caller then sets up
197  * the muxer by filling the various fields in this context:
198  *
199  * - The @ref AVFormatContext.oformat "oformat" field must be set to select the
200  * muxer that will be used.
201  * - Unless the format is of the AVFMT_NOFILE type, the @ref AVFormatContext.pb
202  * "pb" field must be set to an opened IO context, either returned from
203  * avio_open2() or a custom one.
204  * - Unless the format is of the AVFMT_NOSTREAMS type, at least one stream must
205  * be created with the avformat_new_stream() function. The caller should fill
206  * the @ref AVStream.codec "stream codec context" information, such as the
207  * codec @ref AVCodecContext.codec_type "type", @ref AVCodecContext.codec_id
208  * "id" and other parameters (e.g. width / height, the pixel or sample format,
209  * etc.) as known. The @ref AVStream.time_base "stream timebase" should
210  * be set to the timebase that the caller desires to use for this stream (note
211  * that the timebase actually used by the muxer can be different, as will be
212  * described later).
213  * - It is advised to manually initialize only the relevant fields in
214  * AVCodecContext, rather than using @ref avcodec_copy_context() during
215  * remuxing: there is no guarantee that the codec context values remain valid
216  * for both input and output format contexts.
217  * - The caller may fill in additional information, such as @ref
218  * AVFormatContext.metadata "global" or @ref AVStream.metadata "per-stream"
219  * metadata, @ref AVFormatContext.chapters "chapters", @ref
220  * AVFormatContext.programs "programs", etc. as described in the
221  * AVFormatContext documentation. Whether such information will actually be
222  * stored in the output depends on what the container format and the muxer
223  * support.
224  *
225  * When the muxing context is fully set up, the caller must call
226  * avformat_write_header() to initialize the muxer internals and write the file
227  * header. Whether anything actually is written to the IO context at this step
228  * depends on the muxer, but this function must always be called. Any muxer
229  * private options must be passed in the options parameter to this function.
230  *
231  * The data is then sent to the muxer by repeatedly calling av_write_frame() or
232  * av_interleaved_write_frame() (consult those functions' documentation for
233  * discussion on the difference between them; only one of them may be used with
234  * a single muxing context, they should not be mixed). Do note that the timing
235  * information on the packets sent to the muxer must be in the corresponding
236  * AVStream's timebase. That timebase is set by the muxer (in the
237  * avformat_write_header() step) and may be different from the timebase
238  * requested by the caller.
239  *
240  * Once all the data has been written, the caller must call av_write_trailer()
241  * to flush any buffered packets and finalize the output file, then close the IO
242  * context (if any) and finally free the muxing context with
243  * avformat_free_context().
244  * @}
245  *
246  * @defgroup lavf_io I/O Read/Write
247  * @{
248  * @}
249  *
250  * @defgroup lavf_codec Demuxers
251  * @{
252  * @defgroup lavf_codec_native Native Demuxers
253  * @{
254  * @}
255  * @defgroup lavf_codec_wrappers External library wrappers
256  * @{
257  * @}
258  * @}
259  * @defgroup lavf_protos I/O Protocols
260  * @{
261  * @}
262  * @defgroup lavf_internal Internal
263  * @{
264  * @}
265  * @}
266  *
267  */
268 
269 #include <time.h>
270 #include <stdio.h> /* FILE */
271 #include "libavcodec/avcodec.h"
272 #include "libavutil/dict.h"
273 #include "libavutil/log.h"
274 
275 #include "avio.h"
276 #include "libavformat/version.h"
277 
278 struct AVFormatContext;
279 
280 struct AVDeviceInfoList;
282 
283 /**
284  * @defgroup metadata_api Public Metadata API
285  * @{
286  * @ingroup libavf
287  * The metadata API allows libavformat to export metadata tags to a client
288  * application when demuxing. Conversely it allows a client application to
289  * set metadata when muxing.
290  *
291  * Metadata is exported or set as pairs of key/value strings in the 'metadata'
292  * fields of the AVFormatContext, AVStream, AVChapter and AVProgram structs
293  * using the @ref lavu_dict "AVDictionary" API. Like all strings in FFmpeg,
294  * metadata is assumed to be UTF-8 encoded Unicode. Note that metadata
295  * exported by demuxers isn't checked to be valid UTF-8 in most cases.
296  *
297  * Important concepts to keep in mind:
298  * - Keys are unique; there can never be 2 tags with the same key. This is
299  * also meant semantically, i.e., a demuxer should not knowingly produce
300  * several keys that are literally different but semantically identical.
301  * E.g., key=Author5, key=Author6. In this example, all authors must be
302  * placed in the same tag.
303  * - Metadata is flat, not hierarchical; there are no subtags. If you
304  * want to store, e.g., the email address of the child of producer Alice
305  * and actor Bob, that could have key=alice_and_bobs_childs_email_address.
306  * - Several modifiers can be applied to the tag name. This is done by
307  * appending a dash character ('-') and the modifier name in the order
308  * they appear in the list below -- e.g. foo-eng-sort, not foo-sort-eng.
309  * - language -- a tag whose value is localized for a particular language
310  * is appended with the ISO 639-2/B 3-letter language code.
311  * For example: Author-ger=Michael, Author-eng=Mike
312  * The original/default language is in the unqualified "Author" tag.
313  * A demuxer should set a default if it sets any translated tag.
314  * - sorting -- a modified version of a tag that should be used for
315  * sorting will have '-sort' appended. E.g. artist="The Beatles",
316  * artist-sort="Beatles, The".
317  * - Some protocols and demuxers support metadata updates. After a successful
318  * call to av_read_packet(), AVFormatContext.event_flags or AVStream.event_flags
319  * will be updated to indicate if metadata changed. In order to detect metadata
320  * changes on a stream, you need to loop through all streams in the AVFormatContext
321  * and check their individual event_flags.
322  *
323  * - Demuxers attempt to export metadata in a generic format, however tags
324  * with no generic equivalents are left as they are stored in the container.
325  * Follows a list of generic tag names:
326  *
327  @verbatim
328  album -- name of the set this work belongs to
329  album_artist -- main creator of the set/album, if different from artist.
330  e.g. "Various Artists" for compilation albums.
331  artist -- main creator of the work
332  comment -- any additional description of the file.
333  composer -- who composed the work, if different from artist.
334  copyright -- name of copyright holder.
335  creation_time-- date when the file was created, preferably in ISO 8601.
336  date -- date when the work was created, preferably in ISO 8601.
337  disc -- number of a subset, e.g. disc in a multi-disc collection.
338  encoder -- name/settings of the software/hardware that produced the file.
339  encoded_by -- person/group who created the file.
340  filename -- original name of the file.
341  genre -- <self-evident>.
342  language -- main language in which the work is performed, preferably
343  in ISO 639-2 format. Multiple languages can be specified by
344  separating them with commas.
345  performer -- artist who performed the work, if different from artist.
346  E.g for "Also sprach Zarathustra", artist would be "Richard
347  Strauss" and performer "London Philharmonic Orchestra".
348  publisher -- name of the label/publisher.
349  service_name -- name of the service in broadcasting (channel name).
350  service_provider -- name of the service provider in broadcasting.
351  title -- name of the work.
352  track -- number of this work in the set, can be in form current/total.
353  variant_bitrate -- the total bitrate of the bitrate variant that the current stream is part of
354  @endverbatim
355  *
356  * Look in the examples section for an application example how to use the Metadata API.
357  *
358  * @}
359  */
360 
361 /* packet functions */
362 
363 
364 /**
365  * Allocate and read the payload of a packet and initialize its
366  * fields with default values.
367  *
368  * @param s associated IO context
369  * @param pkt packet
370  * @param size desired payload size
371  * @return >0 (read size) if OK, AVERROR_xxx otherwise
372  */
374 
375 
376 /**
377  * Read data and append it to the current content of the AVPacket.
378  * If pkt->size is 0 this is identical to av_get_packet.
379  * Note that this uses av_grow_packet and thus involves a realloc
380  * which is inefficient. Thus this function should only be used
381  * when there is no reasonable way to know (an upper bound of)
382  * the final size.
383  *
384  * @param s associated IO context
385  * @param pkt packet
386  * @param size amount of data to read
387  * @return >0 (read size) if OK, AVERROR_xxx otherwise, previous data
388  * will not be lost even if an error occurs.
389  */
391 
392 #if FF_API_LAVF_FRAC
393 /*************************************************/
394 /* fractional numbers for exact pts handling */
395 
396 /**
397  * The exact value of the fractional number is: 'val + num / den'.
398  * num is assumed to be 0 <= num < den.
399  */
400 typedef struct AVFrac {
401  int64_t val, num, den;
402 } AVFrac;
403 #endif
404 
405 /*************************************************/
406 /* input/output formats */
407 
408 struct AVCodecTag;
409 
410 /**
411  * This structure contains the data a format has to probe a file.
412  */
413 typedef struct AVProbeData {
414  const char *filename;
415  unsigned char *buf; /**< Buffer must have AVPROBE_PADDING_SIZE of extra allocated bytes filled with zero. */
416  int buf_size; /**< Size of buf except extra allocated bytes */
417  const char *mime_type; /**< mime_type, when known. */
418 } AVProbeData;
419 
420 #define AVPROBE_SCORE_RETRY (AVPROBE_SCORE_MAX/4)
421 #define AVPROBE_SCORE_STREAM_RETRY (AVPROBE_SCORE_MAX/4-1)
422 
423 #define AVPROBE_SCORE_EXTENSION 50 ///< score for file extension
424 #define AVPROBE_SCORE_MIME 75 ///< score for file mime type
425 #define AVPROBE_SCORE_MAX 100 ///< maximum score
426 
427 #define AVPROBE_PADDING_SIZE 32 ///< extra allocated bytes at the end of the probe buffer
428 
429 /// Demuxer will use avio_open, no opened file should be provided by the caller.
430 #define AVFMT_NOFILE 0x0001
431 #define AVFMT_NEEDNUMBER 0x0002 /**< Needs '%d' in filename. */
432 #define AVFMT_SHOW_IDS 0x0008 /**< Show format stream IDs numbers. */
433 #define AVFMT_RAWPICTURE 0x0020 /**< Format wants AVPicture structure for
434  raw picture data. */
435 #define AVFMT_GLOBALHEADER 0x0040 /**< Format wants global header. */
436 #define AVFMT_NOTIMESTAMPS 0x0080 /**< Format does not need / have any timestamps. */
437 #define AVFMT_GENERIC_INDEX 0x0100 /**< Use generic index building code. */
438 #define AVFMT_TS_DISCONT 0x0200 /**< Format allows timestamp discontinuities. Note, muxers always require valid (monotone) timestamps */
439 #define AVFMT_VARIABLE_FPS 0x0400 /**< Format allows variable fps. */
440 #define AVFMT_NODIMENSIONS 0x0800 /**< Format does not need width/height */
441 #define AVFMT_NOSTREAMS 0x1000 /**< Format does not require any streams */
442 #define AVFMT_NOBINSEARCH 0x2000 /**< Format does not allow to fall back on binary search via read_timestamp */
443 #define AVFMT_NOGENSEARCH 0x4000 /**< Format does not allow to fall back on generic search */
444 #define AVFMT_NO_BYTE_SEEK 0x8000 /**< Format does not allow seeking by bytes */
445 #define AVFMT_ALLOW_FLUSH 0x10000 /**< Format allows flushing. If not set, the muxer will not receive a NULL packet in the write_packet function. */
446 #if LIBAVFORMAT_VERSION_MAJOR <= 54
447 #define AVFMT_TS_NONSTRICT 0x8020000 //we try to be compatible to the ABIs of ffmpeg and major forks
448 #else
449 #define AVFMT_TS_NONSTRICT 0x20000
450 #endif
451  /**< Format does not require strictly
452  increasing timestamps, but they must
453  still be monotonic */
454 #define AVFMT_TS_NEGATIVE 0x40000 /**< Format allows muxing negative
455  timestamps. If not set the timestamp
456  will be shifted in av_write_frame and
457  av_interleaved_write_frame so they
458  start from 0.
459  The user or muxer can override this through
460  AVFormatContext.avoid_negative_ts
461  */
462 
463 #define AVFMT_SEEK_TO_PTS 0x4000000 /**< Seeking is based on PTS */
464 
465 /**
466  * @addtogroup lavf_encoding
467  * @{
468  */
469 typedef struct AVOutputFormat {
470  const char *name;
471  /**
472  * Descriptive name for the format, meant to be more human-readable
473  * than name. You should use the NULL_IF_CONFIG_SMALL() macro
474  * to define it.
475  */
476  const char *long_name;
477  const char *mime_type;
478  const char *extensions; /**< comma-separated filename extensions */
479  /* output support */
480  enum AVCodecID audio_codec; /**< default audio codec */
481  enum AVCodecID video_codec; /**< default video codec */
482  enum AVCodecID subtitle_codec; /**< default subtitle codec */
483  /**
484  * can use flags: AVFMT_NOFILE, AVFMT_NEEDNUMBER, AVFMT_RAWPICTURE,
485  * AVFMT_GLOBALHEADER, AVFMT_NOTIMESTAMPS, AVFMT_VARIABLE_FPS,
486  * AVFMT_NODIMENSIONS, AVFMT_NOSTREAMS, AVFMT_ALLOW_FLUSH,
487  * AVFMT_TS_NONSTRICT
488  */
489  int flags;
491  /**
492  * List of supported codec_id-codec_tag pairs, ordered by "better
493  * choice first". The arrays are all terminated by AV_CODEC_ID_NONE.
494  */
495  const struct AVCodecTag * const *codec_tag;
496 
498  const AVClass *priv_class; ///< AVClass for the private context
499 
500  /*****************************************************************
501  * No fields below this line are part of the public API. They
502  * may not be used outside of libavformat and can be changed and
503  * removed at will.
504  * New public fields should be added right above.
505  *****************************************************************
506  */
507  struct AVOutputFormat *next;
508  /**
509  * size of private data so that it can be allocated in the wrapper
510  */
511  int priv_data_size;
512 
513  int (*write_header)(struct AVFormatContext *);
514  /**
515  * Write a packet. If AVFMT_ALLOW_FLUSH is set in flags,
516  * pkt can be NULL in order to flush data buffered in the muxer.
517  * When flushing, return 0 if there still is more data to flush,
518  * or 1 if everything was flushed and there is no more buffered
519  * data.
520  */
522  int (*write_trailer)(struct AVFormatContext *);
523  /**
524  * Currently only used to set pixel format if not YUV420P.
525  */
526  int (*interleave_packet)(struct AVFormatContext *, AVPacket *out,
527  AVPacket *in, int flush);
528  /**
529  * Test if the given codec can be stored in this container.
530  *
531  * @return 1 if the codec is supported, 0 if it is not.
532  * A negative number if unknown.
533  * MKTAG('A', 'P', 'I', 'C') if the codec is only supported as AV_DISPOSITION_ATTACHED_PIC
534  */
535  int (*query_codec)(enum AVCodecID id, int std_compliance);
536 
537  void (*get_output_timestamp)(struct AVFormatContext *s, int stream,
538  int64_t *dts, int64_t *wall);
539  /**
540  * Allows sending messages from application to device.
541  */
542  int (*control_message)(struct AVFormatContext *s, int type,
543  void *data, size_t data_size);
544 
545  /**
546  * Write an uncoded AVFrame.
547  *
548  * See av_write_uncoded_frame() for details.
549  *
550  * The library will free *frame afterwards, but the muxer can prevent it
551  * by setting the pointer to NULL.
552  */
553  int (*write_uncoded_frame)(struct AVFormatContext *, int stream_index,
554  AVFrame **frame, unsigned flags);
555  /**
556  * Returns device list with it properties.
557  * @see avdevice_list_devices() for more details.
558  */
559  int (*get_device_list)(struct AVFormatContext *s, struct AVDeviceInfoList *device_list);
560  /**
561  * Initialize device capabilities submodule.
562  * @see avdevice_capabilities_create() for more details.
563  */
565  /**
566  * Free device capabilities submodule.
567  * @see avdevice_capabilities_free() for more details.
568  */
570  enum AVCodecID data_codec; /**< default data codec */
572 /**
573  * @}
574  */
575 
576 /**
577  * @addtogroup lavf_decoding
578  * @{
579  */
580 typedef struct AVInputFormat {
581  /**
582  * A comma separated list of short names for the format. New names
583  * may be appended with a minor bump.
584  */
585  const char *name;
586 
587  /**
588  * Descriptive name for the format, meant to be more human-readable
589  * than name. You should use the NULL_IF_CONFIG_SMALL() macro
590  * to define it.
591  */
592  const char *long_name;
594  /**
595  * Can use flags: AVFMT_NOFILE, AVFMT_NEEDNUMBER, AVFMT_SHOW_IDS,
596  * AVFMT_GENERIC_INDEX, AVFMT_TS_DISCONT, AVFMT_NOBINSEARCH,
597  * AVFMT_NOGENSEARCH, AVFMT_NO_BYTE_SEEK, AVFMT_SEEK_TO_PTS.
598  */
599  int flags;
601  /**
602  * If extensions are defined, then no probe is done. You should
603  * usually not use extension format guessing because it is not
604  * reliable enough
605  */
606  const char *extensions;
608  const struct AVCodecTag * const *codec_tag;
609 
610  const AVClass *priv_class; ///< AVClass for the private context
611 
612  /**
613  * Comma-separated list of mime types.
614  * It is used check for matching mime types while probing.
615  * @see av_probe_input_format2
616  */
617  const char *mime_type;
619  /*****************************************************************
620  * No fields below this line are part of the public API. They
621  * may not be used outside of libavformat and can be changed and
622  * removed at will.
623  * New public fields should be added right above.
624  *****************************************************************
625  */
626  struct AVInputFormat *next;
627 
628  /**
629  * Raw demuxers store their codec ID here.
630  */
631  int raw_codec_id;
632 
633  /**
634  * Size of private data so that it can be allocated in the wrapper.
635  */
636  int priv_data_size;
637 
638  /**
639  * Tell if a given file has a chance of being parsed as this format.
640  * The buffer provided is guaranteed to be AVPROBE_PADDING_SIZE bytes
641  * big so you do not have to check for that unless you need more.
642  */
643  int (*read_probe)(AVProbeData *);
645  /**
646  * Read the format header and initialize the AVFormatContext
647  * structure. Return 0 if OK. 'avformat_new_stream' should be
648  * called to create new streams.
649  */
650  int (*read_header)(struct AVFormatContext *);
652  /**
653  * Read one packet and put it in 'pkt'. pts and flags are also
654  * set. 'avformat_new_stream' can be called only if the flag
655  * AVFMTCTX_NOHEADER is used and only in the calling thread (not in a
656  * background thread).
657  * @return 0 on success, < 0 on error.
658  * When returning an error, pkt must not have been allocated
659  * or must be freed before returning
660  */
661  int (*read_packet)(struct AVFormatContext *, AVPacket *pkt);
662 
663  /**
664  * Close the stream. The AVFormatContext and AVStreams are not
665  * freed by this function
666  */
667  int (*read_close)(struct AVFormatContext *);
668 
669  /**
670  * Seek to a given timestamp relative to the frames in
671  * stream component stream_index.
672  * @param stream_index Must not be -1.
673  * @param flags Selects which direction should be preferred if no exact
674  * match is available.
675  * @return >= 0 on success (but not necessarily the new offset)
676  */
677  int (*read_seek)(struct AVFormatContext *,
678  int stream_index, int64_t timestamp, int flags);
679 
680  /**
681  * Get the next timestamp in stream[stream_index].time_base units.
682  * @return the timestamp or AV_NOPTS_VALUE if an error occurred
683  */
684  int64_t (*read_timestamp)(struct AVFormatContext *s, int stream_index,
685  int64_t *pos, int64_t pos_limit);
686 
687  /**
688  * Start/resume playing - only meaningful if using a network-based format
689  * (RTSP).
690  */
691  int (*read_play)(struct AVFormatContext *);
693  /**
694  * Pause playing - only meaningful if using a network-based format
695  * (RTSP).
696  */
697  int (*read_pause)(struct AVFormatContext *);
698 
699  /**
700  * Seek to timestamp ts.
701  * Seeking will be done so that the point from which all active streams
702  * can be presented successfully will be closest to ts and within min/max_ts.
703  * Active streams are all streams that have AVStream.discard < AVDISCARD_ALL.
704  */
705  int (*read_seek2)(struct AVFormatContext *s, int stream_index, int64_t min_ts, int64_t ts, int64_t max_ts, int flags);
706 
707  /**
708  * Returns device list with it properties.
709  * @see avdevice_list_devices() for more details.
710  */
711  int (*get_device_list)(struct AVFormatContext *s, struct AVDeviceInfoList *device_list);
712 
713  /**
714  * Initialize device capabilities submodule.
715  * @see avdevice_capabilities_create() for more details.
716  */
718 
719  /**
720  * Free device capabilities submodule.
721  * @see avdevice_capabilities_free() for more details.
722  */
724 } AVInputFormat;
725 /**
726  * @}
727  */
728 
729 enum AVStreamParseType {
731  AVSTREAM_PARSE_FULL, /**< full parsing and repack */
732  AVSTREAM_PARSE_HEADERS, /**< Only parse headers, do not repack. */
733  AVSTREAM_PARSE_TIMESTAMPS, /**< full parsing and interpolation of timestamps for frames not starting on a packet boundary */
734  AVSTREAM_PARSE_FULL_ONCE, /**< full parsing and repack of the first frame only, only implemented for H.264 currently */
735  AVSTREAM_PARSE_FULL_RAW=MKTAG(0,'R','A','W'), /**< full parsing and repack with timestamp and position generation by parser for raw
736  this assumes that each packet in the file contains no demuxer level headers and
737  just codec level data, otherwise position generation would fail */
738 };
740 typedef struct AVIndexEntry {
741  int64_t pos;
742  int64_t timestamp; /**<
743  * Timestamp in AVStream.time_base units, preferably the time from which on correctly decoded frames are available
744  * when seeking to this entry. That means preferable PTS on keyframe based formats.
745  * But demuxers can choose to store a different timestamp, if it is more convenient for the implementation or nothing better
746  * is known
747  */
748 #define AVINDEX_KEYFRAME 0x0001
749  int flags:2;
750  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).
751  int min_distance; /**< Minimum distance between this and the previous keyframe, used to avoid unneeded searching. */
752 } AVIndexEntry;
753 
754 #define AV_DISPOSITION_DEFAULT 0x0001
755 #define AV_DISPOSITION_DUB 0x0002
756 #define AV_DISPOSITION_ORIGINAL 0x0004
757 #define AV_DISPOSITION_COMMENT 0x0008
758 #define AV_DISPOSITION_LYRICS 0x0010
759 #define AV_DISPOSITION_KARAOKE 0x0020
760 
761 /**
762  * Track should be used during playback by default.
763  * Useful for subtitle track that should be displayed
764  * even when user did not explicitly ask for subtitles.
765  */
766 #define AV_DISPOSITION_FORCED 0x0040
767 #define AV_DISPOSITION_HEARING_IMPAIRED 0x0080 /**< stream for hearing impaired audiences */
768 #define AV_DISPOSITION_VISUAL_IMPAIRED 0x0100 /**< stream for visual impaired audiences */
769 #define AV_DISPOSITION_CLEAN_EFFECTS 0x0200 /**< stream without voice */
770 /**
771  * The stream is stored in the file as an attached picture/"cover art" (e.g.
772  * APIC frame in ID3v2). The single packet associated with it will be returned
773  * among the first few packets read from the file unless seeking takes place.
774  * It can also be accessed at any time in AVStream.attached_pic.
775  */
776 #define AV_DISPOSITION_ATTACHED_PIC 0x0400
778 /**
779  * To specify text track kind (different from subtitles default).
780  */
781 #define AV_DISPOSITION_CAPTIONS 0x10000
782 #define AV_DISPOSITION_DESCRIPTIONS 0x20000
783 #define AV_DISPOSITION_METADATA 0x40000
785 /**
786  * Options for behavior on timestamp wrap detection.
787  */
788 #define AV_PTS_WRAP_IGNORE 0 ///< ignore the wrap
789 #define AV_PTS_WRAP_ADD_OFFSET 1 ///< add the format specific offset on wrap detection
790 #define AV_PTS_WRAP_SUB_OFFSET -1 ///< subtract the format specific offset on wrap detection
792 /**
793  * Stream structure.
794  * New fields can be added to the end with minor version bumps.
795  * Removal, reordering and changes to existing fields require a major
796  * version bump.
797  * sizeof(AVStream) must not be used outside libav*.
798  */
799 typedef struct AVStream {
800  int index; /**< stream index in AVFormatContext */
801  /**
802  * Format-specific stream ID.
803  * decoding: set by libavformat
804  * encoding: set by the user, replaced by libavformat if left unset
805  */
806  int id;
807  /**
808  * Codec context associated with this stream. Allocated and freed by
809  * libavformat.
810  *
811  * - decoding: The demuxer exports codec information stored in the headers
812  * here.
813  * - encoding: The user sets codec information, the muxer writes it to the
814  * output. Mandatory fields as specified in AVCodecContext
815  * documentation must be set even if this AVCodecContext is
816  * not actually used for encoding.
817  */
819  void *priv_data;
820 
821 #if FF_API_LAVF_FRAC
822  /**
823  * @deprecated this field is unused
824  */
826  struct AVFrac pts;
827 #endif
828 
829  /**
830  * This is the fundamental unit of time (in seconds) in terms
831  * of which frame timestamps are represented.
832  *
833  * decoding: set by libavformat
834  * encoding: May be set by the caller before avformat_write_header() to
835  * provide a hint to the muxer about the desired timebase. In
836  * avformat_write_header(), the muxer will overwrite this field
837  * with the timebase that will actually be used for the timestamps
838  * written into the file (which may or may not be related to the
839  * user-provided one, depending on the format).
840  */
842 
843  /**
844  * Decoding: pts of the first frame of the stream in presentation order, in stream time base.
845  * Only set this if you are absolutely 100% sure that the value you set
846  * it to really is the pts of the first frame.
847  * This may be undefined (AV_NOPTS_VALUE).
848  * @note The ASF header does NOT contain a correct start_time the ASF
849  * demuxer must NOT set this.
850  */
851  int64_t start_time;
852 
853  /**
854  * Decoding: duration of the stream, in stream time base.
855  * If a source file does not specify a duration, but does specify
856  * a bitrate, this value will be estimated from bitrate and file size.
857  */
858  int64_t duration;
860  int64_t nb_frames; ///< number of frames in this stream if known or 0
861 
862  int disposition; /**< AV_DISPOSITION_* bit field */
863 
864  enum AVDiscard discard; ///< Selects which packets can be discarded at will and do not need to be demuxed.
865 
866  /**
867  * sample aspect ratio (0 if unknown)
868  * - encoding: Set by user.
869  * - decoding: Set by libavformat.
870  */
874 
875  /**
876  * Average framerate
877  *
878  * - demuxing: May be set by libavformat when creating the stream or in
879  * avformat_find_stream_info().
880  * - muxing: May be set by the caller before avformat_write_header().
881  */
883 
884  /**
885  * For streams with AV_DISPOSITION_ATTACHED_PIC disposition, this packet
886  * will contain the attached picture.
887  *
888  * decoding: set by libavformat, must not be modified by the caller.
889  * encoding: unused
890  */
892 
893  /**
894  * An array of side data that applies to the whole stream (i.e. the
895  * container does not allow it to change between packets).
896  *
897  * There may be no overlap between the side data in this array and side data
898  * in the packets. I.e. a given side data is either exported by the muxer
899  * (demuxing) / set by the caller (muxing) in this array, then it never
900  * appears in the packets, or the side data is exported / sent through
901  * the packets (always in the first packet where the value becomes known or
902  * changes), then it does not appear in this array.
903  *
904  * - demuxing: Set by libavformat when the stream is created.
905  * - muxing: May be set by the caller before avformat_write_header().
906  *
907  * Freed by libavformat in avformat_free_context().
908  *
909  * @see av_format_inject_global_side_data()
910  */
912  /**
913  * The number of elements in the AVStream.side_data array.
914  */
915  int nb_side_data;
916 
917  /**
918  * Flags for the user to detect events happening on the stream. Flags must
919  * be cleared by the user once the event has been handled.
920  * A combination of AVSTREAM_EVENT_FLAG_*.
921  */
922  int event_flags;
923 #define AVSTREAM_EVENT_FLAG_METADATA_UPDATED 0x0001 ///< The call resulted in updated metadata.
924 
925  /*****************************************************************
926  * All fields below this line are not part of the public API. They
927  * may not be used outside of libavformat and can be changed and
928  * removed at will.
929  * New public fields should be added right above.
930  *****************************************************************
931  */
932 
933  /**
934  * Stream information used internally by av_find_stream_info()
935  */
936 #define MAX_STD_TIMEBASES (30*12+30+3+6)
937  struct {
938  int64_t last_dts;
939  int64_t duration_gcd;
940  int duration_count;
941  int64_t rfps_duration_sum;
942  double (*duration_error)[2][MAX_STD_TIMEBASES];
943  int64_t codec_info_duration;
945 
946  /**
947  * 0 -> decoder has not been searched for yet.
948  * >0 -> decoder found
949  * <0 -> decoder with codec_id == -found_decoder has not been found
950  */
953  int64_t last_duration;
954 
955  /**
956  * Those are used for average framerate estimation.
957  */
958  int64_t fps_first_dts;
960  int64_t fps_last_dts;
962 
963  } *info;
964 
965  int pts_wrap_bits; /**< number of bits in pts (used for wrapping control) */
967  // Timestamp generation support:
968  /**
969  * Timestamp corresponding to the last dts sync point.
970  *
971  * Initialized when AVCodecParserContext.dts_sync_point >= 0 and
972  * a DTS is received from the underlying container. Otherwise set to
973  * AV_NOPTS_VALUE by default.
974  */
975  int64_t first_dts;
976  int64_t cur_dts;
977  int64_t last_IP_pts;
978  int last_IP_duration;
979 
980  /**
981  * Number of packets to buffer for codec probing
982  */
983 #define MAX_PROBE_PACKETS 2500
986  /**
987  * Number of frames that have been demuxed during av_find_stream_info()
988  */
990 
991  /* av_read_frame() support */
994 
995  /**
996  * last packet in packet_buffer for this stream when muxing.
997  */
1000 #define MAX_REORDER_DELAY 16
1002 
1003  AVIndexEntry *index_entries; /**< Only used if the format does not
1004  support seeking natively. */
1005  int nb_index_entries;
1008  /**
1009  * Real base framerate of the stream.
1010  * This is the lowest framerate with which all timestamps can be
1011  * represented accurately (it is the least common multiple of all
1012  * framerates in the stream). Note, this value is just a guess!
1013  * For example, if the time base is 1/90000 and all frames have either
1014  * approximately 3600 or 1800 timer ticks, then r_frame_rate will be 50/1.
1015  *
1016  * Code outside avformat should access this field using:
1017  * av_stream_get/set_r_frame_rate(stream)
1018  */
1020 
1021  /**
1022  * Stream Identifier
1023  * This is the MPEG-TS stream identifier +1
1024  * 0 means unknown
1025  */
1026  int stream_identifier;
1028  int64_t interleaver_chunk_size;
1030 
1031  /**
1032  * stream probing state
1033  * -1 -> probing finished
1034  * 0 -> no probing requested
1035  * rest -> perform probing with request_probe being the minimum score to accept.
1036  * NOT PART OF PUBLIC API
1037  */
1038  int request_probe;
1039  /**
1040  * Indicates that everything up to the next keyframe
1041  * should be discarded.
1042  */
1043  int skip_to_keyframe;
1044 
1045  /**
1046  * Number of samples to skip at the start of the frame decoded from the next packet.
1047  */
1048  int skip_samples;
1049 
1050  /**
1051  * If not 0, the first audio sample that should be discarded from the stream.
1052  * This is broken by design (needs global sample count), but can't be
1053  * avoided for broken by design formats such as mp3 with ad-hoc gapless
1054  * audio support.
1055  */
1057 
1058  /**
1059  * The sample after last sample that is intended to be discarded after
1060  * first_discard_sample. Works on frame boundaries only. Used to prevent
1061  * early EOF if the gapless info is broken (considered concatenated mp3s).
1062  */
1063  int64_t last_discard_sample;
1065  /**
1066  * Number of internally decoded frames, used internally in libavformat, do not access
1067  * its lifetime differs from info which is why it is not in that structure.
1068  */
1069  int nb_decoded_frames;
1070 
1071  /**
1072  * Timestamp offset added to timestamps before muxing
1073  * NOT PART OF PUBLIC API
1074  */
1075  int64_t mux_ts_offset;
1076 
1077  /**
1078  * Internal data to check for wrapping of the time stamp
1079  */
1080  int64_t pts_wrap_reference;
1081 
1082  /**
1083  * Options for behavior, when a wrap is detected.
1084  *
1085  * Defined by AV_PTS_WRAP_ values.
1086  *
1087  * If correction is enabled, there are two possibilities:
1088  * If the first time stamp is near the wrap point, the wrap offset
1089  * will be subtracted, which will create negative time stamps.
1090  * Otherwise the offset will be added.
1091  */
1092  int pts_wrap_behavior;
1093 
1094  /**
1095  * Internal data to prevent doing update_initial_durations() twice
1096  */
1098 
1099  /**
1100  * Internal data to generate dts from pts
1101  */
1104 
1105  /**
1106  * Internal data to analyze DTS and detect faulty mpeg streams
1107  */
1108  int64_t last_dts_for_order_check;
1112  /**
1113  * Internal data to inject global side data
1114  */
1117  /**
1118  * String containing paris of key and values describing recommended encoder configuration.
1119  * Paris are separated by ','.
1120  * Keys are separated from values by '='.
1121  */
1124  /**
1125  * display aspect ratio (0 if unknown)
1126  * - encoding: unused
1127  * - decoding: Set by libavformat to calculate sample_aspect_ratio internally
1128  */
1131 
1136 void av_stream_set_recommended_encoder_configuration(AVStream *s, char *configuration);
1138 /**
1139  * Returns the pts of the last muxed packet + its duration
1140  *
1141  * the retuned value is undefined when used with a demuxer.
1142  */
1143 int64_t av_stream_get_end_pts(const AVStream *st);
1144 
1145 #define AV_PROGRAM_RUNNING 1
1146 
1147 /**
1148  * New fields can be added to the end with minor version bumps.
1149  * Removal, reordering and changes to existing fields require a major
1150  * version bump.
1151  * sizeof(AVProgram) must not be used outside libav*.
1152  */
1153 typedef struct AVProgram {
1154  int id;
1155  int flags;
1156  enum AVDiscard discard; ///< selects which program to discard and which to feed to the caller
1157  unsigned int *stream_index;
1158  unsigned int nb_stream_indexes;
1160 
1162  int pmt_pid;
1163  int pcr_pid;
1165  /*****************************************************************
1166  * All fields below this line are not part of the public API. They
1167  * may not be used outside of libavformat and can be changed and
1168  * removed at will.
1169  * New public fields should be added right above.
1170  *****************************************************************
1171  */
1172  int64_t start_time;
1173  int64_t end_time;
1174 
1175  int64_t pts_wrap_reference; ///< reference dts for wrap detection
1176  int pts_wrap_behavior; ///< behavior on wrap detection
1177 } AVProgram;
1178 
1179 #define AVFMTCTX_NOHEADER 0x0001 /**< signal that no header is present
1180  (streams are added dynamically) */
1182 typedef struct AVChapter {
1183  int id; ///< unique ID to identify the chapter
1184  AVRational time_base; ///< time base in which the start/end timestamps are specified
1185  int64_t start, end; ///< chapter start/end time in time_base units
1188 
1189 
1190 /**
1191  * Callback used by devices to communicate with application.
1192  */
1193 typedef int (*av_format_control_message)(struct AVFormatContext *s, int type,
1194  void *data, size_t data_size);
1196 
1197 /**
1198  * The duration of a video can be estimated through various ways, and this enum can be used
1199  * to know how the duration was estimated.
1200  */
1202  AVFMT_DURATION_FROM_PTS, ///< Duration accurately estimated from PTSes
1203  AVFMT_DURATION_FROM_STREAM, ///< Duration estimated from a stream with a known duration
1204  AVFMT_DURATION_FROM_BITRATE ///< Duration estimated from bitrate (less accurate)
1205 };
1206 
1207 typedef struct AVFormatInternal AVFormatInternal;
1208 
1209 /**
1210  * Format I/O context.
1211  * New fields can be added to the end with minor version bumps.
1212  * Removal, reordering and changes to existing fields require a major
1213  * version bump.
1214  * sizeof(AVFormatContext) must not be used outside libav*, use
1215  * avformat_alloc_context() to create an AVFormatContext.
1216  */
1217 typedef struct AVFormatContext {
1218  /**
1219  * A class for logging and @ref avoptions. Set by avformat_alloc_context().
1220  * Exports (de)muxer private options if they exist.
1221  */
1222  const AVClass *av_class;
1223 
1224  /**
1225  * The input container format.
1226  *
1227  * Demuxing only, set by avformat_open_input().
1228  */
1229  struct AVInputFormat *iformat;
1230 
1231  /**
1232  * The output container format.
1233  *
1234  * Muxing only, must be set by the caller before avformat_write_header().
1235  */
1236  struct AVOutputFormat *oformat;
1237 
1238  /**
1239  * Format private data. This is an AVOptions-enabled struct
1240  * if and only if iformat/oformat.priv_class is not NULL.
1241  *
1242  * - muxing: set by avformat_write_header()
1243  * - demuxing: set by avformat_open_input()
1244  */
1245  void *priv_data;
1246 
1247  /**
1248  * I/O context.
1249  *
1250  * - demuxing: either set by the user before avformat_open_input() (then
1251  * the user must close it manually) or set by avformat_open_input().
1252  * - muxing: set by the user before avformat_write_header(). The caller must
1253  * take care of closing / freeing the IO context.
1254  *
1255  * Do NOT set this field if AVFMT_NOFILE flag is set in
1256  * iformat/oformat.flags. In such a case, the (de)muxer will handle
1257  * I/O in some other way and this field will be NULL.
1258  */
1259  AVIOContext *pb;
1260 
1261  /* stream info */
1262  /**
1263  * Flags signalling stream properties. A combination of AVFMTCTX_*.
1264  * Set by libavformat.
1265  */
1266  int ctx_flags;
1267 
1268  /**
1269  * Number of elements in AVFormatContext.streams.
1270  *
1271  * Set by avformat_new_stream(), must not be modified by any other code.
1272  */
1273  unsigned int nb_streams;
1274  /**
1275  * A list of all streams in the file. New streams are created with
1276  * avformat_new_stream().
1277  *
1278  * - demuxing: streams are created by libavformat in avformat_open_input().
1279  * If AVFMTCTX_NOHEADER is set in ctx_flags, then new streams may also
1280  * appear in av_read_frame().
1281  * - muxing: streams are created by the user before avformat_write_header().
1282  *
1283  * Freed by libavformat in avformat_free_context().
1284  */
1285  AVStream **streams;
1286 
1287  /**
1288  * input or output filename
1289  *
1290  * - demuxing: set by avformat_open_input()
1291  * - muxing: may be set by the caller before avformat_write_header()
1292  */
1293  char filename[1024];
1295  /**
1296  * Position of the first frame of the component, in
1297  * AV_TIME_BASE fractional seconds. NEVER set this value directly:
1298  * It is deduced from the AVStream values.
1299  *
1300  * Demuxing only, set by libavformat.
1301  */
1302  int64_t start_time;
1303 
1304  /**
1305  * Duration of the stream, in AV_TIME_BASE fractional
1306  * seconds. Only set this value if you know none of the individual stream
1307  * durations and also do not set any of them. This is deduced from the
1308  * AVStream values if not set.
1309  *
1310  * Demuxing only, set by libavformat.
1311  */
1312  int64_t duration;
1313 
1314  /**
1315  * Total stream bitrate in bit/s, 0 if not
1316  * available. Never set it directly if the file_size and the
1317  * duration are known as FFmpeg can compute it automatically.
1318  */
1319  int bit_rate;
1320 
1321  unsigned int packet_size;
1322  int max_delay;
1323 
1324  /**
1325  * Flags modifying the (de)muxer behaviour. A combination of AVFMT_FLAG_*.
1326  * Set by the user before avformat_open_input() / avformat_write_header().
1327  */
1328  int flags;
1329 #define AVFMT_FLAG_GENPTS 0x0001 ///< Generate missing pts even if it requires parsing future frames.
1330 #define AVFMT_FLAG_IGNIDX 0x0002 ///< Ignore index.
1331 #define AVFMT_FLAG_NONBLOCK 0x0004 ///< Do not block when reading packets from input.
1332 #define AVFMT_FLAG_IGNDTS 0x0008 ///< Ignore DTS on frames that contain both DTS & PTS
1333 #define AVFMT_FLAG_NOFILLIN 0x0010 ///< Do not infer any values from other values, just return what is stored in the container
1334 #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
1335 #define AVFMT_FLAG_NOBUFFER 0x0040 ///< Do not buffer frames when possible
1336 #define AVFMT_FLAG_CUSTOM_IO 0x0080 ///< The caller has supplied a custom AVIOContext, don't avio_close() it.
1337 #define AVFMT_FLAG_DISCARD_CORRUPT 0x0100 ///< Discard frames marked corrupted
1338 #define AVFMT_FLAG_FLUSH_PACKETS 0x0200 ///< Flush the AVIOContext every packet.
1339 /**
1340  * When muxing, try to avoid writing any random/volatile data to the output.
1341  * This includes any random IDs, real-time timestamps/dates, muxer version, etc.
1342  *
1343  * This flag is mainly intended for testing.
1344  */
1345 #define AVFMT_FLAG_BITEXACT 0x0400
1346 #define AVFMT_FLAG_MP4A_LATM 0x8000 ///< Enable RTP MP4A-LATM payload
1347 #define AVFMT_FLAG_SORT_DTS 0x10000 ///< try to interleave outputted packets by dts (using this flag can slow demuxing down)
1348 #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)
1349 #define AVFMT_FLAG_KEEP_SIDE_DATA 0x40000 ///< Don't merge side data but keep it separate.
1350 
1351  /**
1352  * @deprecated deprecated in favor of probesize2
1353  */
1354  unsigned int probesize;
1356  /**
1357  * @deprecated deprecated in favor of max_analyze_duration2
1358  */
1361 
1362  const uint8_t *key;
1363  int keylen;
1364 
1365  unsigned int nb_programs;
1366  AVProgram **programs;
1367 
1368  /**
1369  * Forced video codec_id.
1370  * Demuxing: Set by user.
1371  */
1373 
1374  /**
1375  * Forced audio codec_id.
1376  * Demuxing: Set by user.
1377  */
1379 
1380  /**
1381  * Forced subtitle codec_id.
1382  * Demuxing: Set by user.
1383  */
1385 
1386  /**
1387  * Maximum amount of memory in bytes to use for the index of each stream.
1388  * If the index exceeds this size, entries will be discarded as
1389  * needed to maintain a smaller size. This can lead to slower or less
1390  * accurate seeking (depends on demuxer).
1391  * Demuxers for which a full in-memory index is mandatory will ignore
1392  * this.
1393  * - muxing: unused
1394  * - demuxing: set by user
1395  */
1396  unsigned int max_index_size;
1397 
1398  /**
1399  * Maximum amount of memory in bytes to use for buffering frames
1400  * obtained from realtime capture devices.
1401  */
1402  unsigned int max_picture_buffer;
1403 
1404  /**
1405  * Number of chapters in AVChapter array.
1406  * When muxing, chapters are normally written in the file header,
1407  * so nb_chapters should normally be initialized before write_header
1408  * is called. Some muxers (e.g. mov and mkv) can also write chapters
1409  * in the trailer. To write chapters in the trailer, nb_chapters
1410  * must be zero when write_header is called and non-zero when
1411  * write_trailer is called.
1412  * - muxing: set by user
1413  * - demuxing: set by libavformat
1414  */
1415  unsigned int nb_chapters;
1416  AVChapter **chapters;
1417 
1418  /**
1419  * Metadata that applies to the whole file.
1420  *
1421  * - demuxing: set by libavformat in avformat_open_input()
1422  * - muxing: may be set by the caller before avformat_write_header()
1423  *
1424  * Freed by libavformat in avformat_free_context().
1425  */
1427 
1428  /**
1429  * Start time of the stream in real world time, in microseconds
1430  * since the Unix epoch (00:00 1st January 1970). That is, pts=0 in the
1431  * stream was captured at this real world time.
1432  * - muxing: Set by the caller before avformat_write_header(). If set to
1433  * either 0 or AV_NOPTS_VALUE, then the current wall-time will
1434  * be used.
1435  * - demuxing: Set by libavformat. AV_NOPTS_VALUE if unknown. Note that
1436  * the value may become known after some number of frames
1437  * have been received.
1438  */
1439  int64_t start_time_realtime;
1440 
1441  /**
1442  * The number of frames used for determining the framerate in
1443  * avformat_find_stream_info().
1444  * Demuxing only, set by the caller before avformat_find_stream_info().
1445  */
1446  int fps_probe_size;
1447 
1448  /**
1449  * Error recognition; higher values will detect more errors but may
1450  * misdetect some more or less valid parts as errors.
1451  * Demuxing only, set by the caller before avformat_open_input().
1452  */
1453  int error_recognition;
1454 
1455  /**
1456  * Custom interrupt callbacks for the I/O layer.
1457  *
1458  * demuxing: set by the user before avformat_open_input().
1459  * muxing: set by the user before avformat_write_header()
1460  * (mainly useful for AVFMT_NOFILE formats). The callback
1461  * should also be passed to avio_open2() if it's used to
1462  * open the file.
1463  */
1465 
1466  /**
1467  * Flags to enable debugging.
1468  */
1469  int debug;
1470 #define FF_FDEBUG_TS 0x0001
1471 
1472  /**
1473  * Maximum buffering duration for interleaving.
1474  *
1475  * To ensure all the streams are interleaved correctly,
1476  * av_interleaved_write_frame() will wait until it has at least one packet
1477  * for each stream before actually writing any packets to the output file.
1478  * When some streams are "sparse" (i.e. there are large gaps between
1479  * successive packets), this can result in excessive buffering.
1480  *
1481  * This field specifies the maximum difference between the timestamps of the
1482  * first and the last packet in the muxing queue, above which libavformat
1483  * will output a packet regardless of whether it has queued a packet for all
1484  * the streams.
1485  *
1486  * Muxing only, set by the caller before avformat_write_header().
1487  */
1488  int64_t max_interleave_delta;
1489 
1490  /**
1491  * Allow non-standard and experimental extension
1492  * @see AVCodecContext.strict_std_compliance
1493  */
1495 
1496  /**
1497  * Flags for the user to detect events happening on the file. Flags must
1498  * be cleared by the user once the event has been handled.
1499  * A combination of AVFMT_EVENT_FLAG_*.
1500  */
1501  int event_flags;
1502 #define AVFMT_EVENT_FLAG_METADATA_UPDATED 0x0001 ///< The call resulted in updated metadata.
1504  /**
1505  * Maximum number of packets to read while waiting for the first timestamp.
1506  * Decoding only.
1507  */
1508  int max_ts_probe;
1509 
1510  /**
1511  * Avoid negative timestamps during muxing.
1512  * Any value of the AVFMT_AVOID_NEG_TS_* constants.
1513  * Note, this only works when using av_interleaved_write_frame. (interleave_packet_per_dts is in use)
1514  * - muxing: Set by user
1515  * - demuxing: unused
1516  */
1518 #define AVFMT_AVOID_NEG_TS_AUTO -1 ///< Enabled when required by target format
1519 #define AVFMT_AVOID_NEG_TS_MAKE_NON_NEGATIVE 1 ///< Shift timestamps so they are non negative
1520 #define AVFMT_AVOID_NEG_TS_MAKE_ZERO 2 ///< Shift timestamps so that they start at 0
1521 
1522  /**
1523  * Transport stream id.
1524  * This will be moved into demuxer private options. Thus no API/ABI compatibility
1525  */
1526  int ts_id;
1528  /**
1529  * Audio preload in microseconds.
1530  * Note, not all formats support this and unpredictable things may happen if it is used when not supported.
1531  * - encoding: Set by user via AVOptions (NO direct access)
1532  * - decoding: unused
1533  */
1534  int audio_preload;
1536  /**
1537  * Max chunk time in microseconds.
1538  * Note, not all formats support this and unpredictable things may happen if it is used when not supported.
1539  * - encoding: Set by user via AVOptions (NO direct access)
1540  * - decoding: unused
1541  */
1542  int max_chunk_duration;
1544  /**
1545  * Max chunk size in bytes
1546  * Note, not all formats support this and unpredictable things may happen if it is used when not supported.
1547  * - encoding: Set by user via AVOptions (NO direct access)
1548  * - decoding: unused
1549  */
1550  int max_chunk_size;
1552  /**
1553  * forces the use of wallclock timestamps as pts/dts of packets
1554  * This has undefined results in the presence of B frames.
1555  * - encoding: unused
1556  * - decoding: Set by user via AVOptions (NO direct access)
1557  */
1560  /**
1561  * avio flags, used to force AVIO_FLAG_DIRECT.
1562  * - encoding: unused
1563  * - decoding: Set by user via AVOptions (NO direct access)
1564  */
1565  int avio_flags;
1566 
1567  /**
1568  * The duration field can be estimated through various ways, and this field can be used
1569  * to know how the duration was estimated.
1570  * - encoding: unused
1571  * - decoding: Read by user via AVOptions (NO direct access)
1572  */
1575  /**
1576  * Skip initial bytes when opening stream
1577  * - encoding: unused
1578  * - decoding: Set by user via AVOptions (NO direct access)
1579  */
1580  int64_t skip_initial_bytes;
1581 
1582  /**
1583  * Correct single timestamp overflows
1584  * - encoding: unused
1585  * - decoding: Set by user via AVOptions (NO direct access)
1586  */
1587  unsigned int correct_ts_overflow;
1588 
1589  /**
1590  * Force seeking to any (also non key) frames.
1591  * - encoding: unused
1592  * - decoding: Set by user via AVOptions (NO direct access)
1593  */
1594  int seek2any;
1595 
1596  /**
1597  * Flush the I/O context after each packet.
1598  * - encoding: Set by user via AVOptions (NO direct access)
1599  * - decoding: unused
1600  */
1601  int flush_packets;
1602 
1603  /**
1604  * format probing score.
1605  * The maximal score is AVPROBE_SCORE_MAX, its set when the demuxer probes
1606  * the format.
1607  * - encoding: unused
1608  * - decoding: set by avformat, read by user via av_format_get_probe_score() (NO direct access)
1609  */
1611 
1612  /**
1613  * number of bytes to read maximally to identify format.
1614  * - encoding: unused
1615  * - decoding: set by user through AVOPtions (NO direct access)
1616  */
1617  int format_probesize;
1618 
1619  /**
1620  * ',' separated list of allowed decoders.
1621  * If NULL then all are allowed
1622  * - encoding: unused
1623  * - decoding: set by user through AVOptions (NO direct access)
1624  */
1625  char *codec_whitelist;
1627  /**
1628  * ',' separated list of allowed demuxers.
1629  * If NULL then all are allowed
1630  * - encoding: unused
1631  * - decoding: set by user through AVOptions (NO direct access)
1632  */
1633  char *format_whitelist;
1635  /**
1636  * An opaque field for libavformat internal usage.
1637  * Must not be accessed in any way by callers.
1638  */
1639  AVFormatInternal *internal;
1640 
1641  /**
1642  * IO repositioned flag.
1643  * This is set by avformat when the underlaying IO context read pointer
1644  * is repositioned, for example when doing byte based seeking.
1645  * Demuxers can use the flag to detect such changes.
1646  */
1647  int io_repositioned;
1649  /**
1650  * Forced video codec.
1651  * This allows forcing a specific decoder, even when there are multiple with
1652  * the same codec_id.
1653  * Demuxing: Set by user via av_format_set_video_codec (NO direct access).
1654  */
1657  /**
1658  * Forced audio codec.
1659  * This allows forcing a specific decoder, even when there are multiple with
1660  * the same codec_id.
1661  * Demuxing: Set by user via av_format_set_audio_codec (NO direct access).
1662  */
1665  /**
1666  * Forced subtitle codec.
1667  * This allows forcing a specific decoder, even when there are multiple with
1668  * the same codec_id.
1669  * Demuxing: Set by user via av_format_set_subtitle_codec (NO direct access).
1670  */
1673  /**
1674  * Forced data codec.
1675  * This allows forcing a specific decoder, even when there are multiple with
1676  * the same codec_id.
1677  * Demuxing: Set by user via av_format_set_data_codec (NO direct access).
1678  */
1681  /**
1682  * Number of bytes to be written as padding in a metadata header.
1683  * Demuxing: Unused.
1684  * Muxing: Set by user via av_format_set_metadata_header_padding.
1685  */
1687 
1688  /**
1689  * User data.
1690  * This is a place for some private data of the user.
1691  * Mostly usable with control_message_cb or any future callbacks in device's context.
1692  */
1693  void *opaque;
1694 
1695  /**
1696  * Callback used by devices to communicate with application.
1697  */
1699 
1700  /**
1701  * Output timestamp offset, in microseconds.
1702  * Muxing: set by user via AVOptions (NO direct access)
1703  */
1704  int64_t output_ts_offset;
1705 
1706  /**
1707  * Maximum duration (in AV_TIME_BASE units) of the data read
1708  * from input in avformat_find_stream_info().
1709  * Demuxing only, set by the caller before avformat_find_stream_info()
1710  * via AVOptions (NO direct access).
1711  * Can be set to 0 to let avformat choose using a heuristic.
1712  */
1714 
1715  /**
1716  * Maximum size of the data read from input for determining
1717  * the input container format.
1718  * Demuxing only, set by the caller before avformat_open_input()
1719  * via AVOptions (NO direct access).
1720  */
1721  int64_t probesize2;
1723  /**
1724  * dump format separator.
1725  * can be ", " or "\n " or anything else
1726  * Code outside libavformat should access this field using AVOptions
1727  * (NO direct access).
1728  * - muxing: Set by user.
1729  * - demuxing: Set by user.
1730  */
1732 
1733  /**
1734  * Forced Data codec_id.
1735  * Demuxing: Set by user.
1736  */
1737  enum AVCodecID data_codec_id;
1738 } AVFormatContext;
1739 
1751 void * av_format_get_opaque(const AVFormatContext *s);
1752 void av_format_set_opaque(AVFormatContext *s, void *opaque);
1755 
1756 /**
1757  * This function will cause global side data to be injected in the next packet
1758  * of each stream as well as after any subsequent seek.
1759  */
1761 
1762 /**
1763  * Returns the method used to set ctx->duration.
1764  *
1765  * @return AVFMT_DURATION_FROM_PTS, AVFMT_DURATION_FROM_STREAM, or AVFMT_DURATION_FROM_BITRATE.
1766  */
1768 
1769 typedef struct AVPacketList {
1770  AVPacket pkt;
1771  struct AVPacketList *next;
1772 } AVPacketList;
1773 
1774 
1775 /**
1776  * @defgroup lavf_core Core functions
1777  * @ingroup libavf
1778  *
1779  * Functions for querying libavformat capabilities, allocating core structures,
1780  * etc.
1781  * @{
1782  */
1783 
1784 /**
1785  * Return the LIBAVFORMAT_VERSION_INT constant.
1786  */
1787 unsigned avformat_version(void);
1788 
1789 /**
1790  * Return the libavformat build-time configuration.
1791  */
1792 const char *avformat_configuration(void);
1793 
1794 /**
1795  * Return the libavformat license.
1796  */
1797 const char *avformat_license(void);
1798 
1799 /**
1800  * Initialize libavformat and register all the muxers, demuxers and
1801  * protocols. If you do not call this function, then you can select
1802  * exactly which formats you want to support.
1803  *
1804  * @see av_register_input_format()
1805  * @see av_register_output_format()
1806  */
1807 void av_register_all(void);
1808 
1811 
1812 /**
1813  * Do global initialization of network components. This is optional,
1814  * but recommended, since it avoids the overhead of implicitly
1815  * doing the setup for each session.
1816  *
1817  * Calling this function will become mandatory if using network
1818  * protocols at some major version bump.
1819  */
1820 int avformat_network_init(void);
1821 
1822 /**
1823  * Undo the initialization done by avformat_network_init.
1824  */
1825 int avformat_network_deinit(void);
1826 
1827 /**
1828  * If f is NULL, returns the first registered input format,
1829  * if f is non-NULL, returns the next registered input format after f
1830  * or NULL if f is the last one.
1831  */
1833 
1834 /**
1835  * If f is NULL, returns the first registered output format,
1836  * if f is non-NULL, returns the next registered output format after f
1837  * or NULL if f is the last one.
1838  */
1840 
1841 /**
1842  * Allocate an AVFormatContext.
1843  * avformat_free_context() can be used to free the context and everything
1844  * allocated by the framework within it.
1845  */
1847 
1848 /**
1849  * Free an AVFormatContext and all its streams.
1850  * @param s context to free
1851  */
1853 
1854 /**
1855  * Get the AVClass for AVFormatContext. It can be used in combination with
1856  * AV_OPT_SEARCH_FAKE_OBJ for examining options.
1857  *
1858  * @see av_opt_find().
1859  */
1860 const AVClass *avformat_get_class(void);
1861 
1862 /**
1863  * Add a new stream to a media file.
1864  *
1865  * When demuxing, it is called by the demuxer in read_header(). If the
1866  * flag AVFMTCTX_NOHEADER is set in s.ctx_flags, then it may also
1867  * be called in read_packet().
1868  *
1869  * When muxing, should be called by the user before avformat_write_header().
1870  *
1871  * User is required to call avcodec_close() and avformat_free_context() to
1872  * clean up the allocation by avformat_new_stream().
1873  *
1874  * @param s media file handle
1875  * @param c If non-NULL, the AVCodecContext corresponding to the new stream
1876  * will be initialized to use this codec. This is needed for e.g. codec-specific
1877  * defaults to be set, so codec should be provided if it is known.
1878  *
1879  * @return newly created stream or NULL on error.
1880  */
1882 
1883 /**
1884  * Get side information from stream.
1885  *
1886  * @param stream stream
1887  * @param type desired side information type
1888  * @param size pointer for side information size to store (optional)
1889  * @return pointer to data if present or NULL otherwise
1890  */
1892  enum AVPacketSideDataType type, int *size);
1893 
1895 
1896 /**
1897  * @}
1898  */
1899 
1900 
1901 /**
1902  * Allocate an AVFormatContext for an output format.
1903  * avformat_free_context() can be used to free the context and
1904  * everything allocated by the framework within it.
1905  *
1906  * @param *ctx is set to the created format context, or to NULL in
1907  * case of failure
1908  * @param oformat format to use for allocating the context, if NULL
1909  * format_name and filename are used instead
1910  * @param format_name the name of output format to use for allocating the
1911  * context, if NULL filename is used instead
1912  * @param filename the name of the filename to use for allocating the
1913  * context, may be NULL
1914  * @return >= 0 in case of success, a negative AVERROR code in case of
1915  * failure
1916  */
1918  const char *format_name, const char *filename);
1919 
1920 /**
1921  * @addtogroup lavf_decoding
1922  * @{
1923  */
1924 
1925 /**
1926  * Find AVInputFormat based on the short name of the input format.
1927  */
1928 AVInputFormat *av_find_input_format(const char *short_name);
1929 
1930 /**
1931  * Guess the file format.
1932  *
1933  * @param pd data to be probed
1934  * @param is_opened Whether the file is already opened; determines whether
1935  * demuxers with or without AVFMT_NOFILE are probed.
1936  */
1937 AVInputFormat *av_probe_input_format(AVProbeData *pd, int is_opened);
1938 
1939 /**
1940  * Guess the file format.
1941  *
1942  * @param pd data to be probed
1943  * @param is_opened Whether the file is already opened; determines whether
1944  * demuxers with or without AVFMT_NOFILE are probed.
1945  * @param score_max A probe score larger that this is required to accept a
1946  * detection, the variable is set to the actual detection
1947  * score afterwards.
1948  * If the score is <= AVPROBE_SCORE_MAX / 4 it is recommended
1949  * to retry with a larger probe buffer.
1950  */
1951 AVInputFormat *av_probe_input_format2(AVProbeData *pd, int is_opened, int *score_max);
1952 
1953 /**
1954  * Guess the file format.
1955  *
1956  * @param is_opened Whether the file is already opened; determines whether
1957  * demuxers with or without AVFMT_NOFILE are probed.
1958  * @param score_ret The score of the best detection.
1959  */
1960 AVInputFormat *av_probe_input_format3(AVProbeData *pd, int is_opened, int *score_ret);
1961 
1962 /**
1963  * Probe a bytestream to determine the input format. Each time a probe returns
1964  * with a score that is too low, the probe buffer size is increased and another
1965  * attempt is made. When the maximum probe size is reached, the input format
1966  * with the highest score is returned.
1967  *
1968  * @param pb the bytestream to probe
1969  * @param fmt the input format is put here
1970  * @param url the url of the stream
1971  * @param logctx the log context
1972  * @param offset the offset within the bytestream to probe from
1973  * @param max_probe_size the maximum probe buffer size (zero for default)
1974  * @return the score in case of success, a negative value corresponding to an
1975  * the maximal score is AVPROBE_SCORE_MAX
1976  * AVERROR code otherwise
1977  */
1979  const char *url, void *logctx,
1980  unsigned int offset, unsigned int max_probe_size);
1981 
1982 /**
1983  * Like av_probe_input_buffer2() but returns 0 on success
1984  */
1986  const char *url, void *logctx,
1987  unsigned int offset, unsigned int max_probe_size);
1988 
1989 /**
1990  * Open an input stream and read the header. The codecs are not opened.
1991  * The stream must be closed with avformat_close_input().
1992  *
1993  * @param ps Pointer to user-supplied AVFormatContext (allocated by avformat_alloc_context).
1994  * May be a pointer to NULL, in which case an AVFormatContext is allocated by this
1995  * function and written into ps.
1996  * Note that a user-supplied AVFormatContext will be freed on failure.
1997  * @param url URL of the stream to open.
1998  * @param fmt If non-NULL, this parameter forces a specific input format.
1999  * Otherwise the format is autodetected.
2000  * @param options A dictionary filled with AVFormatContext and demuxer-private options.
2001  * On return this parameter will be destroyed and replaced with a dict containing
2002  * options that were not found. May be NULL.
2003  *
2004  * @return 0 on success, a negative AVERROR on failure.
2005  *
2006  * @note If you want to use custom IO, preallocate the format context and set its pb field.
2007  */
2009 
2012 
2013 /**
2014  * Read packets of a media file to get stream information. This
2015  * is useful for file formats with no headers such as MPEG. This
2016  * function also computes the real framerate in case of MPEG-2 repeat
2017  * frame mode.
2018  * The logical file position is not changed by this function;
2019  * examined packets may be buffered for later processing.
2020  *
2021  * @param ic media file handle
2022  * @param options If non-NULL, an ic.nb_streams long array of pointers to
2023  * dictionaries, where i-th member contains options for
2024  * codec corresponding to i-th stream.
2025  * On return each dictionary will be filled with options that were not found.
2026  * @return >=0 if OK, AVERROR_xxx on error
2027  *
2028  * @note this function isn't guaranteed to open all the codecs, so
2029  * options being non-empty at return is a perfectly normal behavior.
2030  *
2031  * @todo Let the user decide somehow what information is needed so that
2032  * we do not waste time getting stuff the user does not need.
2033  */
2035 
2036 /**
2037  * Find the programs which belong to a given stream.
2038  *
2039  * @param ic media file handle
2040  * @param last the last found program, the search will start after this
2041  * program, or from the beginning if it is NULL
2042  * @param s stream index
2043  * @return the next program which belongs to s, NULL if no program is found or
2044  * the last program is not among the programs of ic.
2045  */
2047 
2048 /**
2049  * Find the "best" stream in the file.
2050  * The best stream is determined according to various heuristics as the most
2051  * likely to be what the user expects.
2052  * If the decoder parameter is non-NULL, av_find_best_stream will find the
2053  * default decoder for the stream's codec; streams for which no decoder can
2054  * be found are ignored.
2055  *
2056  * @param ic media file handle
2057  * @param type stream type: video, audio, subtitles, etc.
2058  * @param wanted_stream_nb user-requested stream number,
2059  * or -1 for automatic selection
2060  * @param related_stream try to find a stream related (eg. in the same
2061  * program) to this one, or -1 if none
2062  * @param decoder_ret if non-NULL, returns the decoder for the
2063  * selected stream
2064  * @param flags flags; none are currently defined
2065  * @return the non-negative stream number in case of success,
2066  * AVERROR_STREAM_NOT_FOUND if no stream with the requested type
2067  * could be found,
2068  * AVERROR_DECODER_NOT_FOUND if streams were found but no decoder
2069  * @note If av_find_best_stream returns successfully and decoder_ret is not
2070  * NULL, then *decoder_ret is guaranteed to be set to a valid AVCodec.
2071  */
2073  enum AVMediaType type,
2074  int wanted_stream_nb,
2075  int related_stream,
2076  AVCodec **decoder_ret,
2077  int flags);
2078 
2079 /**
2080  * Return the next frame of a stream.
2081  * This function returns what is stored in the file, and does not validate
2082  * that what is there are valid frames for the decoder. It will split what is
2083  * stored in the file into frames and return one for each call. It will not
2084  * omit invalid data between valid frames so as to give the decoder the maximum
2085  * information possible for decoding.
2086  *
2087  * If pkt->buf is NULL, then the packet is valid until the next
2088  * av_read_frame() or until avformat_close_input(). Otherwise the packet
2089  * is valid indefinitely. In both cases the packet must be freed with
2090  * av_free_packet when it is no longer needed. For video, the packet contains
2091  * exactly one frame. For audio, it contains an integer number of frames if each
2092  * frame has a known fixed size (e.g. PCM or ADPCM data). If the audio frames
2093  * have a variable size (e.g. MPEG audio), then it contains one frame.
2094  *
2095  * pkt->pts, pkt->dts and pkt->duration are always set to correct
2096  * values in AVStream.time_base units (and guessed if the format cannot
2097  * provide them). pkt->pts can be AV_NOPTS_VALUE if the video format
2098  * has B-frames, so it is better to rely on pkt->dts if you do not
2099  * decompress the payload.
2100  *
2101  * @return 0 if OK, < 0 on error or end of file
2102  */
2104 
2105 /**
2106  * Seek to the keyframe at timestamp.
2107  * 'timestamp' in 'stream_index'.
2108  *
2109  * @param s media file handle
2110  * @param stream_index If stream_index is (-1), a default
2111  * stream is selected, and timestamp is automatically converted
2112  * from AV_TIME_BASE units to the stream specific time_base.
2113  * @param timestamp Timestamp in AVStream.time_base units
2114  * or, if no stream is specified, in AV_TIME_BASE units.
2115  * @param flags flags which select direction and seeking mode
2116  * @return >= 0 on success
2117  */
2118 int av_seek_frame(AVFormatContext *s, int stream_index, int64_t timestamp,
2119  int flags);
2120 
2121 /**
2122  * Seek to timestamp ts.
2123  * Seeking will be done so that the point from which all active streams
2124  * can be presented successfully will be closest to ts and within min/max_ts.
2125  * Active streams are all streams that have AVStream.discard < AVDISCARD_ALL.
2126  *
2127  * If flags contain AVSEEK_FLAG_BYTE, then all timestamps are in bytes and
2128  * are the file position (this may not be supported by all demuxers).
2129  * If flags contain AVSEEK_FLAG_FRAME, then all timestamps are in frames
2130  * in the stream with stream_index (this may not be supported by all demuxers).
2131  * Otherwise all timestamps are in units of the stream selected by stream_index
2132  * or if stream_index is -1, in AV_TIME_BASE units.
2133  * If flags contain AVSEEK_FLAG_ANY, then non-keyframes are treated as
2134  * keyframes (this may not be supported by all demuxers).
2135  * If flags contain AVSEEK_FLAG_BACKWARD, it is ignored.
2136  *
2137  * @param s media file handle
2138  * @param stream_index index of the stream which is used as time base reference
2139  * @param min_ts smallest acceptable timestamp
2140  * @param ts target timestamp
2141  * @param max_ts largest acceptable timestamp
2142  * @param flags flags
2143  * @return >=0 on success, error code otherwise
2144  *
2145  * @note This is part of the new seek API which is still under construction.
2146  * Thus do not use this yet. It may change at any time, do not expect
2147  * ABI compatibility yet!
2148  */
2149 int avformat_seek_file(AVFormatContext *s, int stream_index, int64_t min_ts, int64_t ts, int64_t max_ts, int flags);
2150 
2151 /**
2152  * Discard all internally buffered data. This can be useful when dealing with
2153  * discontinuities in the byte stream. Generally works only with formats that
2154  * can resync. This includes headerless formats like MPEG-TS/TS but should also
2155  * work with NUT, Ogg and in a limited way AVI for example.
2156  *
2157  * The set of streams, the detected duration, stream parameters and codecs do
2158  * not change when calling this function. If you want a complete reset, it's
2159  * better to open a new AVFormatContext.
2160  *
2161  * This does not flush the AVIOContext (s->pb). If necessary, call
2162  * avio_flush(s->pb) before calling this function.
2163  *
2164  * @param s media file handle
2165  * @return >=0 on success, error code otherwise
2166  */
2168 
2169 /**
2170  * Start playing a network-based stream (e.g. RTSP stream) at the
2171  * current position.
2172  */
2174 
2175 /**
2176  * Pause a network-based stream (e.g. RTSP stream).
2177  *
2178  * Use av_read_play() to resume it.
2179  */
2181 
2182 /**
2183  * Close an opened input AVFormatContext. Free it and all its contents
2184  * and set *s to NULL.
2185  */
2187 /**
2188  * @}
2189  */
2190 
2191 #define AVSEEK_FLAG_BACKWARD 1 ///< seek backward
2192 #define AVSEEK_FLAG_BYTE 2 ///< seeking based on position in bytes
2193 #define AVSEEK_FLAG_ANY 4 ///< seek to any frame, even non-keyframes
2194 #define AVSEEK_FLAG_FRAME 8 ///< seeking based on frame number
2195 
2196 /**
2197  * @addtogroup lavf_encoding
2198  * @{
2199  */
2200 /**
2201  * Allocate the stream private data and write the stream header to
2202  * an output media file.
2203  *
2204  * @param s Media file handle, must be allocated with avformat_alloc_context().
2205  * Its oformat field must be set to the desired output format;
2206  * Its pb field must be set to an already opened AVIOContext.
2207  * @param options An AVDictionary filled with AVFormatContext and muxer-private options.
2208  * On return this parameter will be destroyed and replaced with a dict containing
2209  * options that were not found. May be NULL.
2210  *
2211  * @return 0 on success, negative AVERROR on failure.
2212  *
2213  * @see av_opt_find, av_dict_set, avio_open, av_oformat_next.
2214  */
2216 
2217 /**
2218  * Write a packet to an output media file.
2219  *
2220  * This function passes the packet directly to the muxer, without any buffering
2221  * or reordering. The caller is responsible for correctly interleaving the
2222  * packets if the format requires it. Callers that want libavformat to handle
2223  * the interleaving should call av_interleaved_write_frame() instead of this
2224  * function.
2225  *
2226  * @param s media file handle
2227  * @param pkt The packet containing the data to be written. Note that unlike
2228  * av_interleaved_write_frame(), this function does not take
2229  * ownership of the packet passed to it (though some muxers may make
2230  * an internal reference to the input packet).
2231  * <br>
2232  * This parameter can be NULL (at any time, not just at the end), in
2233  * order to immediately flush data buffered within the muxer, for
2234  * muxers that buffer up data internally before writing it to the
2235  * output.
2236  * <br>
2237  * Packet's @ref AVPacket.stream_index "stream_index" field must be
2238  * set to the index of the corresponding stream in @ref
2239  * AVFormatContext.streams "s->streams". It is very strongly
2240  * recommended that timing information (@ref AVPacket.pts "pts", @ref
2241  * AVPacket.dts "dts", @ref AVPacket.duration "duration") is set to
2242  * correct values.
2243  * @return < 0 on error, = 0 if OK, 1 if flushed and there is no more data to flush
2244  *
2245  * @see av_interleaved_write_frame()
2246  */
2248 
2249 /**
2250  * Write a packet to an output media file ensuring correct interleaving.
2251  *
2252  * This function will buffer the packets internally as needed to make sure the
2253  * packets in the output file are properly interleaved in the order of
2254  * increasing dts. Callers doing their own interleaving should call
2255  * av_write_frame() instead of this function.
2256  *
2257  * @param s media file handle
2258  * @param pkt The packet containing the data to be written.
2259  * <br>
2260  * If the packet is reference-counted, this function will take
2261  * ownership of this reference and unreference it later when it sees
2262  * fit.
2263  * The caller must not access the data through this reference after
2264  * this function returns. If the packet is not reference-counted,
2265  * libavformat will make a copy.
2266  * <br>
2267  * This parameter can be NULL (at any time, not just at the end), to
2268  * flush the interleaving queues.
2269  * <br>
2270  * Packet's @ref AVPacket.stream_index "stream_index" field must be
2271  * set to the index of the corresponding stream in @ref
2272  * AVFormatContext.streams "s->streams". It is very strongly
2273  * recommended that timing information (@ref AVPacket.pts "pts", @ref
2274  * AVPacket.dts "dts", @ref AVPacket.duration "duration") is set to
2275  * correct values.
2276  *
2277  * @return 0 on success, a negative AVERROR on error. Libavformat will always
2278  * take care of freeing the packet, even if this function fails.
2279  *
2280  * @see av_write_frame(), AVFormatContext.max_interleave_delta
2281  */
2283 
2284 /**
2285  * Write a uncoded frame to an output media file.
2286  *
2287  * The frame must be correctly interleaved according to the container
2288  * specification; if not, then av_interleaved_write_frame() must be used.
2289  *
2290  * See av_interleaved_write_frame() for details.
2291  */
2292 int av_write_uncoded_frame(AVFormatContext *s, int stream_index,
2293  AVFrame *frame);
2294 
2295 /**
2296  * Write a uncoded frame to an output media file.
2297  *
2298  * If the muxer supports it, this function allows to write an AVFrame
2299  * structure directly, without encoding it into a packet.
2300  * It is mostly useful for devices and similar special muxers that use raw
2301  * video or PCM data and will not serialize it into a byte stream.
2302  *
2303  * To test whether it is possible to use it with a given muxer and stream,
2304  * use av_write_uncoded_frame_query().
2305  *
2306  * The caller gives up ownership of the frame and must not access it
2307  * afterwards.
2308  *
2309  * @return >=0 for success, a negative code on error
2310  */
2311 int av_interleaved_write_uncoded_frame(AVFormatContext *s, int stream_index,
2312  AVFrame *frame);
2313 
2314 /**
2315  * Test whether a muxer supports uncoded frame.
2316  *
2317  * @return >=0 if an uncoded frame can be written to that muxer and stream,
2318  * <0 if not
2319  */
2320 int av_write_uncoded_frame_query(AVFormatContext *s, int stream_index);
2321 
2322 /**
2323  * Write the stream trailer to an output media file and free the
2324  * file private data.
2325  *
2326  * May only be called after a successful call to avformat_write_header.
2327  *
2328  * @param s media file handle
2329  * @return 0 if OK, AVERROR_xxx on error
2330  */
2332 
2333 /**
2334  * Return the output format in the list of registered output formats
2335  * which best matches the provided parameters, or return NULL if
2336  * there is no match.
2337  *
2338  * @param short_name if non-NULL checks if short_name matches with the
2339  * names of the registered formats
2340  * @param filename if non-NULL checks if filename terminates with the
2341  * extensions of the registered formats
2342  * @param mime_type if non-NULL checks if mime_type matches with the
2343  * MIME type of the registered formats
2344  */
2345 AVOutputFormat *av_guess_format(const char *short_name,
2346  const char *filename,
2347  const char *mime_type);
2348 
2349 /**
2350  * Guess the codec ID based upon muxer and filename.
2351  */
2352 enum AVCodecID av_guess_codec(AVOutputFormat *fmt, const char *short_name,
2353  const char *filename, const char *mime_type,
2354  enum AVMediaType type);
2355 
2356 /**
2357  * Get timing information for the data currently output.
2358  * The exact meaning of "currently output" depends on the format.
2359  * It is mostly relevant for devices that have an internal buffer and/or
2360  * work in real time.
2361  * @param s media file handle
2362  * @param stream stream in the media file
2363  * @param[out] dts DTS of the last packet output for the stream, in stream
2364  * time_base units
2365  * @param[out] wall absolute time when that packet whas output,
2366  * in microsecond
2367  * @return 0 if OK, AVERROR(ENOSYS) if the format does not support it
2368  * Note: some formats or devices may not allow to measure dts and wall
2369  * atomically.
2370  */
2371 int av_get_output_timestamp(struct AVFormatContext *s, int stream,
2372  int64_t *dts, int64_t *wall);
2373 
2374 
2375 /**
2376  * @}
2377  */
2378 
2379 
2380 /**
2381  * @defgroup lavf_misc Utility functions
2382  * @ingroup libavf
2383  * @{
2384  *
2385  * Miscellaneous utility functions related to both muxing and demuxing
2386  * (or neither).
2387  */
2388 
2389 /**
2390  * Send a nice hexadecimal dump of a buffer to the specified file stream.
2391  *
2392  * @param f The file stream pointer where the dump should be sent to.
2393  * @param buf buffer
2394  * @param size buffer size
2395  *
2396  * @see av_hex_dump_log, av_pkt_dump2, av_pkt_dump_log2
2397  */
2398 void av_hex_dump(FILE *f, const uint8_t *buf, int size);
2399 
2400 /**
2401  * Send a nice hexadecimal dump of a buffer to the log.
2402  *
2403  * @param avcl A pointer to an arbitrary struct of which the first field is a
2404  * pointer to an AVClass struct.
2405  * @param level The importance level of the message, lower values signifying
2406  * higher importance.
2407  * @param buf buffer
2408  * @param size buffer size
2409  *
2410  * @see av_hex_dump, av_pkt_dump2, av_pkt_dump_log2
2411  */
2412 void av_hex_dump_log(void *avcl, int level, const uint8_t *buf, int size);
2413 
2414 /**
2415  * Send a nice dump of a packet to the specified file stream.
2416  *
2417  * @param f The file stream pointer where the dump should be sent to.
2418  * @param pkt packet to dump
2419  * @param dump_payload True if the payload must be displayed, too.
2420  * @param st AVStream that the packet belongs to
2421  */
2422 void av_pkt_dump2(FILE *f, const AVPacket *pkt, int dump_payload, const AVStream *st);
2423 
2424 
2425 /**
2426  * Send a nice dump of a packet to the log.
2427  *
2428  * @param avcl A pointer to an arbitrary struct of which the first field is a
2429  * pointer to an AVClass struct.
2430  * @param level The importance level of the message, lower values signifying
2431  * higher importance.
2432  * @param pkt packet to dump
2433  * @param dump_payload True if the payload must be displayed, too.
2434  * @param st AVStream that the packet belongs to
2435  */
2436 void av_pkt_dump_log2(void *avcl, int level, const AVPacket *pkt, int dump_payload,
2437  const AVStream *st);
2438 
2439 /**
2440  * Get the AVCodecID for the given codec tag tag.
2441  * If no codec id is found returns AV_CODEC_ID_NONE.
2442  *
2443  * @param tags list of supported codec_id-codec_tag pairs, as stored
2444  * in AVInputFormat.codec_tag and AVOutputFormat.codec_tag
2445  * @param tag codec tag to match to a codec ID
2446  */
2447 enum AVCodecID av_codec_get_id(const struct AVCodecTag * const *tags, unsigned int tag);
2448 
2449 /**
2450  * Get the codec tag for the given codec id id.
2451  * If no codec tag is found returns 0.
2452  *
2453  * @param tags list of supported codec_id-codec_tag pairs, as stored
2454  * in AVInputFormat.codec_tag and AVOutputFormat.codec_tag
2455  * @param id codec ID to match to a codec tag
2456  */
2457 unsigned int av_codec_get_tag(const struct AVCodecTag * const *tags, enum AVCodecID id);
2458 
2459 /**
2460  * Get the codec tag for the given codec id.
2461  *
2462  * @param tags list of supported codec_id - codec_tag pairs, as stored
2463  * in AVInputFormat.codec_tag and AVOutputFormat.codec_tag
2464  * @param id codec id that should be searched for in the list
2465  * @param tag A pointer to the found tag
2466  * @return 0 if id was not found in tags, > 0 if it was found
2467  */
2468 int av_codec_get_tag2(const struct AVCodecTag * const *tags, enum AVCodecID id,
2469  unsigned int *tag);
2470 
2472 
2473 /**
2474  * Get the index for a specific timestamp.
2475  *
2476  * @param st stream that the timestamp belongs to
2477  * @param timestamp timestamp to retrieve the index for
2478  * @param flags if AVSEEK_FLAG_BACKWARD then the returned index will correspond
2479  * to the timestamp which is <= the requested one, if backward
2480  * is 0, then it will be >=
2481  * if AVSEEK_FLAG_ANY seek to any frame, only keyframes otherwise
2482  * @return < 0 if no such timestamp could be found
2483  */
2484 int av_index_search_timestamp(AVStream *st, int64_t timestamp, int flags);
2485 
2486 /**
2487  * Add an index entry into a sorted list. Update the entry if the list
2488  * already contains it.
2489  *
2490  * @param timestamp timestamp in the time base of the given stream
2491  */
2492 int av_add_index_entry(AVStream *st, int64_t pos, int64_t timestamp,
2493  int size, int distance, int flags);
2494 
2495 
2496 /**
2497  * Split a URL string into components.
2498  *
2499  * The pointers to buffers for storing individual components may be null,
2500  * in order to ignore that component. Buffers for components not found are
2501  * set to empty strings. If the port is not found, it is set to a negative
2502  * value.
2503  *
2504  * @param proto the buffer for the protocol
2505  * @param proto_size the size of the proto buffer
2506  * @param authorization the buffer for the authorization
2507  * @param authorization_size the size of the authorization buffer
2508  * @param hostname the buffer for the host name
2509  * @param hostname_size the size of the hostname buffer
2510  * @param port_ptr a pointer to store the port number in
2511  * @param path the buffer for the path
2512  * @param path_size the size of the path buffer
2513  * @param url the URL to split
2514  */
2515 void av_url_split(char *proto, int proto_size,
2516  char *authorization, int authorization_size,
2517  char *hostname, int hostname_size,
2518  int *port_ptr,
2519  char *path, int path_size,
2520  const char *url);
2521 
2522 
2523 /**
2524  * Print detailed information about the input or output format, such as
2525  * duration, bitrate, streams, container, programs, metadata, side data,
2526  * codec and time base.
2527  *
2528  * @param ic the context to analyze
2529  * @param index index of the stream to dump information about
2530  * @param url the URL to print, such as source or destination file
2531  * @param is_output Select whether the specified context is an input(0) or output(1)
2532  */
2534  int index,
2535  const char *url,
2536  int is_output);
2537 
2538 /**
2539  * Return in 'buf' the path with '%d' replaced by a number.
2540  *
2541  * Also handles the '%0nd' format where 'n' is the total number
2542  * of digits and '%%'.
2543  *
2544  * @param buf destination buffer
2545  * @param buf_size destination buffer size
2546  * @param path numbered sequence string
2547  * @param number frame number
2548  * @return 0 if OK, -1 on format error
2549  */
2550 int av_get_frame_filename(char *buf, int buf_size,
2551  const char *path, int number);
2552 
2553 /**
2554  * Check whether filename actually is a numbered sequence generator.
2555  *
2556  * @param filename possible numbered sequence string
2557  * @return 1 if a valid numbered sequence string, 0 otherwise
2558  */
2559 int av_filename_number_test(const char *filename);
2560 
2561 /**
2562  * Generate an SDP for an RTP session.
2563  *
2564  * Note, this overwrites the id values of AVStreams in the muxer contexts
2565  * for getting unique dynamic payload types.
2566  *
2567  * @param ac array of AVFormatContexts describing the RTP streams. If the
2568  * array is composed by only one context, such context can contain
2569  * multiple AVStreams (one AVStream per RTP stream). Otherwise,
2570  * all the contexts in the array (an AVCodecContext per RTP stream)
2571  * must contain only one AVStream.
2572  * @param n_files number of AVCodecContexts contained in ac
2573  * @param buf buffer where the SDP will be stored (must be allocated by
2574  * the caller)
2575  * @param size the size of the buffer
2576  * @return 0 if OK, AVERROR_xxx on error
2577  */
2578 int av_sdp_create(AVFormatContext *ac[], int n_files, char *buf, int size);
2579 
2580 /**
2581  * Return a positive value if the given filename has one of the given
2582  * extensions, 0 otherwise.
2583  *
2584  * @param filename file name to check against the given extensions
2585  * @param extensions a comma-separated list of filename extensions
2586  */
2587 int av_match_ext(const char *filename, const char *extensions);
2588 
2589 /**
2590  * Test if the given container can store a codec.
2591  *
2592  * @param ofmt container to check for compatibility
2593  * @param codec_id codec to potentially store in container
2594  * @param std_compliance standards compliance level, one of FF_COMPLIANCE_*
2595  *
2596  * @return 1 if codec with ID codec_id can be stored in ofmt, 0 if it cannot.
2597  * A negative number if this information is not available.
2598  */
2600  int std_compliance);
2601 
2602 /**
2603  * @defgroup riff_fourcc RIFF FourCCs
2604  * @{
2605  * Get the tables mapping RIFF FourCCs to libavcodec AVCodecIDs. The tables are
2606  * meant to be passed to av_codec_get_id()/av_codec_get_tag() as in the
2607  * following code:
2608  * @code
2609  * uint32_t tag = MKTAG('H', '2', '6', '4');
2610  * const struct AVCodecTag *table[] = { avformat_get_riff_video_tags(), 0 };
2611  * enum AVCodecID id = av_codec_get_id(table, tag);
2612  * @endcode
2613  */
2614 /**
2615  * @return the table mapping RIFF FourCCs for video to libavcodec AVCodecID.
2616  */
2617 const struct AVCodecTag *avformat_get_riff_video_tags(void);
2618 /**
2619  * @return the table mapping RIFF FourCCs for audio to AVCodecID.
2620  */
2621 const struct AVCodecTag *avformat_get_riff_audio_tags(void);
2622 /**
2623  * @return the table mapping MOV FourCCs for video to libavcodec AVCodecID.
2624  */
2625 const struct AVCodecTag *avformat_get_mov_video_tags(void);
2626 /**
2627  * @return the table mapping MOV FourCCs for audio to AVCodecID.
2628  */
2629 const struct AVCodecTag *avformat_get_mov_audio_tags(void);
2630 
2631 /**
2632  * @}
2633  */
2634 
2635 /**
2636  * Guess the sample aspect ratio of a frame, based on both the stream and the
2637  * frame aspect ratio.
2638  *
2639  * Since the frame aspect ratio is set by the codec but the stream aspect ratio
2640  * is set by the demuxer, these two may not be equal. This function tries to
2641  * return the value that you should use if you would like to display the frame.
2642  *
2643  * Basic logic is to use the stream aspect ratio if it is set to something sane
2644  * otherwise use the frame aspect ratio. This way a container setting, which is
2645  * usually easy to modify can override the coded value in the frames.
2646  *
2647  * @param format the format context which the stream is part of
2648  * @param stream the stream which the frame is part of
2649  * @param frame the frame with the aspect ratio to be determined
2650  * @return the guessed (valid) sample_aspect_ratio, 0/1 if no idea
2651  */
2653 
2654 /**
2655  * Guess the frame rate, based on both the container and codec information.
2656  *
2657  * @param ctx the format context which the stream is part of
2658  * @param stream the stream which the frame is part of
2659  * @param frame the frame for which the frame rate should be determined, may be NULL
2660  * @return the guessed (valid) frame rate, 0/1 if no idea
2661  */
2663 
2664 /**
2665  * Check if the stream st contained in s is matched by the stream specifier
2666  * spec.
2667  *
2668  * See the "stream specifiers" chapter in the documentation for the syntax
2669  * of spec.
2670  *
2671  * @return >0 if st is matched by spec;
2672  * 0 if st is not matched by spec;
2673  * AVERROR code if spec is invalid
2674  *
2675  * @note A stream specifier can match several streams in the format.
2676  */
2678  const char *spec);
2679 
2681 
2682 
2683 /**
2684  * @}
2685  */
2686 
2687 #endif /* AVFORMAT_AVFORMAT_H */
unsigned int nb_chapters
Number of chapters in AVChapter array.
Definition: avformat.h:1424
unsigned int max_index_size
Maximum amount of memory in bytes to use for the index of each stream.
Definition: avformat.h:1405
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:3877
int64_t interleaver_chunk_size
Definition: avformat.h:1036
unsigned int packet_size
Definition: avformat.h:1330
int64_t first_dts
Timestamp corresponding to the last dts sync point.
Definition: avformat.h:983
full parsing and interpolation of timestamps for frames not starting on a packet boundary ...
Definition: avformat.h:741
const char const char void * val
Definition: avisynth_c.h:672
int64_t duration_gcd
Definition: avformat.h:947
int audio_preload
Audio preload in microseconds.
Definition: avformat.h:1543
const char * s
Definition: avisynth_c.h:669
Bytestream IO Context.
Definition: avio.h:68
void av_pkt_dump2(FILE *f, const AVPacket *pkt, int dump_payload, const AVStream *st)
Send a nice dump of a packet to the specified file stream.
Definition: dump.c:106
AVProbeData probe_data
Definition: avformat.h:1007
Buffered I/O operations.
AVPacketSideDataType
Definition: avcodec.h:975
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:1448
attribute_deprecated int av_demuxer_open(AVFormatContext *ic)
Definition: utils.c:308
char * recommended_encoder_configuration
String containing paris of key and values describing recommended encoder configuration.
Definition: avformat.h:1130
This structure describes decoded (raw) audio or video data.
Definition: frame.h:163
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:692
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:880
AVIOInterruptCB interrupt_callback
Custom interrupt callbacks for the I/O layer.
Definition: avformat.h:1473
ptrdiff_t const GLvoid * data
Definition: opengl_enc.c:101
int av_add_index_entry(AVStream *st, int64_t pos, int64_t timestamp, int size, int distance, int flags)
Add an index entry into a sorted list.
Definition: utils.c:1734
int flush_packets
Flush the I/O context after each packet.
Definition: avformat.h:1610
enum AVCodecID id
Definition: mxfenc.c:95
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:398
int av_write_frame(AVFormatContext *s, AVPacket *pkt)
Write a packet to an output media file.
Definition: mux.c:639
const char * fmt
Definition: avisynth_c.h:670
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:1582
const char * filename
Definition: avformat.h:414
int64_t pts_buffer[MAX_REORDER_DELAY+1]
Definition: avformat.h:1009
unsigned int max_picture_buffer
Maximum amount of memory in bytes to use for buffering frames obtained from realtime capture devices...
Definition: avformat.h:1411
int64_t pos
Definition: avformat.h:749
int probe_packets
Definition: avformat.h:992
int event_flags
Flags for the user to detect events happening on the stream.
Definition: avformat.h:930
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:4178
enum AVCodecID video_codec
default video codec
Definition: avformat.h:489
int64_t first_discard_sample
If not 0, the first audio sample that should be discarded from the stream.
Definition: avformat.h:1064
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:1088
AVRational sample_aspect_ratio
sample aspect ratio (0 if unknown)
Definition: avformat.h:879
uint8_t * dump_separator
dump format separator.
Definition: avformat.h:1740
int index
stream index in AVFormatContext
Definition: avformat.h:808
int avio_flags
avio flags, used to force AVIO_FLAG_DIRECT.
Definition: avformat.h:1574
AVIndexEntry * index_entries
Only used if the format does not support seeking natively.
Definition: avformat.h:1011
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_dlog(ac->avr,"%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(* free_device_capabilities)(struct AVFormatContext *s, struct AVDeviceCapabilitiesQuery *caps)
Free device capabilities submodule.
Definition: avformat.h:577
uint8_t * av_stream_get_side_data(AVStream *stream, enum AVPacketSideDataType type, int *size)
Get side information from stream.
Definition: utils.c:4444
int event_flags
Flags for the user to detect events happening on the file.
Definition: avformat.h:1510
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:978
void * priv_data
Definition: avformat.h:827
AVInputFormat * av_probe_input_format3(AVProbeData *pd, int is_opened, int *score_ret)
Guess the file format.
Definition: format.c:169
int(* write_packet)(struct AVFormatContext *, AVPacket *pkt)
Write a packet.
Definition: avformat.h:529
AVPacketSideData * side_data
An array of side data that applies to the whole stream (i.e.
Definition: avformat.h:919
static AVPacket pkt
int av_write_uncoded_frame_query(AVFormatContext *s, int stream_index)
Test whether a muxer supports uncoded frame.
Definition: mux.c:1056
int priv_data_size
Size of private data so that it can be allocated in the wrapper.
Definition: avformat.h:644
int ctx_flags
Flags signalling stream properties.
Definition: avformat.h:1275
AVDictionary * metadata
Definition: avformat.h:1195
enum AVCodecID subtitle_codec_id
Forced subtitle codec_id.
Definition: avformat.h:1393
AVCodec.
Definition: avcodec.h:3173
int strict_std_compliance
Allow non-standard and experimental extension.
Definition: avformat.h:1503
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:124
int64_t last_dts_for_order_check
Internal data to analyze DTS and detect faulty mpeg streams.
Definition: avformat.h:1116
Format I/O context.
Definition: avformat.h:1226
int64_t output_ts_offset
Output timestamp offset, in microseconds.
Definition: avformat.h:1713
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:4201
unsigned int nb_stream_indexes
Definition: avformat.h:1166
int64_t cur_dts
Definition: avformat.h:984
const struct AVCodecTag * avformat_get_mov_audio_tags(void)
Definition: isom.c:593
Public dictionary API.
int flags
Definition: avformat.h:1163
int(* read_close)(struct AVFormatContext *)
Close the stream.
Definition: avformat.h:675
int flags
can use flags: AVFMT_NOFILE, AVFMT_NEEDNUMBER, AVFMT_RAWPICTURE, AVFMT_GLOBALHEADER, AVFMT_NOTIMESTAMPS, AVFMT_VARIABLE_FPS, AVFMT_NODIMENSIONS, AVFMT_NOSTREAMS, AVFMT_ALLOW_FLUSH, AVFMT_TS_NONSTRICT
Definition: avformat.h:497
uint8_t
int stream_identifier
Stream Identifier This is the MPEG-TS stream identifier +1 0 means unknown.
Definition: avformat.h:1034
const struct AVCodecTag * avformat_get_riff_video_tags(void)
Definition: riff.c:461
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:607
enum AVCodecID av_codec_get_id(const struct AVCodecTag *const *tags, unsigned int tag)
Get the AVCodecID for the given codec tag tag.
unsigned avformat_version(void)
Return the LIBAVFORMAT_VERSION_INT constant.
Definition: utils.c:62
const char * avformat_license(void)
Return the libavformat license.
Definition: utils.c:73
int(* free_device_capabilities)(struct AVFormatContext *s, struct AVDeviceCapabilitiesQuery *caps)
Free device capabilities submodule.
Definition: avformat.h:731
AVPacket pkt
Definition: avformat.h:1779
int priv_data_size
size of private data so that it can be allocated in the wrapper
Definition: avformat.h:519
int id
unique ID to identify the chapter
Definition: avformat.h:1192
enum AVStreamParseType need_parsing
Definition: avformat.h:1000
int id
Format-specific stream ID.
Definition: avformat.h:814
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:4222
int duration_count
Definition: avformat.h:948
int nb_side_data
The number of elements in the AVStream.side_data array.
Definition: avformat.h:923
AVDurationEstimationMethod
The duration of a video can be estimated through various ways, and this enum can be used to know how ...
Definition: avformat.h:1210
AVStream * avformat_new_stream(AVFormatContext *s, const AVCodec *c)
Add a new stream to a media file.
Definition: utils.c:3663
int pmt_pid
Definition: avformat.h:1170
AVStream ** streams
A list of all streams in the file.
Definition: avformat.h:1294
int av_codec_get_tag2(const struct AVCodecTag *const *tags, enum AVCodecID id, unsigned int *tag)
Get the codec tag for the given codec id.
static AVFrame * frame
AVFormatContext * avformat_alloc_context(void)
Allocate an AVFormatContext.
Definition: options.c:107
int inject_global_side_data
Internal data to inject global side data.
Definition: avformat.h:1123
void av_pkt_dump_log2(void *avcl, int level, const AVPacket *pkt, int dump_payload, const AVStream *st)
Send a nice dump of a packet to the log.
Definition: dump.c:111
const char * avformat_configuration(void)
Return the libavformat build-time configuration.
Definition: utils.c:68
#define MAX_REORDER_DELAY
Definition: avformat.h:1008
const AVClass * priv_class
AVClass for the private context.
Definition: avformat.h:618
int64_t last_duration
Definition: avformat.h:961
int flags
Flags modifying the (de)muxer behaviour.
Definition: avformat.h:1337
AVProgram * av_new_program(AVFormatContext *s, int id)
Definition: utils.c:3731
int(* read_header)(struct AVFormatContext *)
Read the format header and initialize the AVFormatContext structure.
Definition: avformat.h:658
int64_t max_interleave_delta
Maximum buffering duration for interleaving.
Definition: avformat.h:1497
int64_t probesize2
Maximum size of the data read from input for determining the input container format.
Definition: avformat.h:1730
uint32_t tag
Definition: movenc.c:1332
int avformat_network_init(void)
Do global initialization of network components.
Definition: utils.c:4113
const struct AVCodecTag * avformat_get_riff_audio_tags(void)
Definition: riff.c:466
int fps_probe_size
The number of frames used for determining the framerate in avformat_find_stream_info().
Definition: avformat.h:1455
int av_sdp_create(AVFormatContext *ac[], int n_files, char *buf, int size)
Generate an SDP for an RTP session.
Definition: sdp.c:819
int av_get_packet(AVIOContext *s, AVPacket *pkt, int size)
Allocate and read the payload of a packet and initialize its fields with default values.
Definition: utils.c:240
int av_match_ext(const char *filename, const char *extensions)
Return a positive value if the given filename has one of the given extensions, 0 otherwise.
Definition: format.c:81
const AVClass * avformat_get_class(void)
Get the AVClass for AVFormatContext.
Definition: options.c:129
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:239
enum AVDiscard discard
selects which program to discard and which to feed to the caller
Definition: avformat.h:1164
const OptionDef options[]
Definition: ffserver.c:3749
unsigned int * stream_index
Definition: avformat.h:1165
AVCodec * av_format_get_audio_codec(const AVFormatContext *s)
enum AVCodecID video_codec_id
Forced video codec_id.
Definition: avformat.h:1381
full parsing and repack with timestamp and position generation by parser for raw this assumes that ea...
Definition: avformat.h:743
int64_t rfps_duration_sum
Definition: avformat.h:949
Duration estimated from bitrate (less accurate)
Definition: avformat.h:1213
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:250
unsigned int correct_ts_overflow
Correct single timestamp overflows.
Definition: avformat.h:1596
struct AVOutputFormat * oformat
The output container format.
Definition: avformat.h:1245
int64_t start_time
Definition: avformat.h:1180
const struct AVCodecTag * avformat_get_mov_video_tags(void)
Definition: isom.c:588
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:118
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:428
Callback for checking whether to abort blocking functions.
Definition: avio.h:51
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:3487
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:332
int(* write_uncoded_frame)(struct AVFormatContext *, int stream_index, AVFrame **frame, unsigned flags)
Write an uncoded AVFrame.
Definition: avformat.h:561
AVProgram * av_find_program_from_stream(AVFormatContext *ic, AVProgram *last, int s)
Find the programs which belong to a given stream.
Definition: utils.c:3470
int max_ts_probe
Maximum number of packets to read while waiting for the first timestamp.
Definition: avformat.h:1517
int format_probesize
number of bytes to read maximally to identify format.
Definition: avformat.h:1626
AVCodecID
Identify the syntax and semantics of the bitstream.
Definition: avcodec.h:102
AVDictionary * metadata
Metadata that applies to the whole file.
Definition: avformat.h:1435
int nb_decoded_frames
Number of internally decoded frames, used internally in libavformat, do not access its lifetime diffe...
Definition: avformat.h:1077
int av_index_search_timestamp(AVStream *st, int64_t timestamp, int flags)
Get the index for a specific timestamp.
Definition: utils.c:1776
int(* read_probe)(AVProbeData *)
Tell if a given file has a chance of being parsed as this format.
Definition: avformat.h:651
void av_hex_dump(FILE *f, const uint8_t *buf, int size)
Send a nice hexadecimal dump of a buffer to the specified file stream.
Definition: dump.c:72
int64_t pts_wrap_reference
reference dts for wrap detection
Definition: avformat.h:1183
const char * long_name
Descriptive name for the format, meant to be more human-readable than name.
Definition: avformat.h:484
int64_t timestamp
Timestamp in AVStream.time_base units, preferably the time from which on correctly decoded frames are...
Definition: avformat.h:750
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:543
AVCodec * av_format_get_subtitle_codec(const AVFormatContext *s)
int(* write_header)(struct AVFormatContext *)
Definition: avformat.h:521
const char * r
Definition: vf_curves.c:107
struct AVCodecParserContext * av_stream_get_parser(const AVStream *s)
Definition: utils.c:121
unsigned int nb_programs
Definition: avformat.h:1374
int last_IP_duration
Definition: avformat.h:986
int av_read_play(AVFormatContext *s)
Start playing a network-based stream (e.g.
Definition: utils.c:3553
AVChapter ** chapters
Definition: avformat.h:1425
int skip_samples
Number of samples to skip at the start of the frame decoded from the next packet. ...
Definition: avformat.h:1056
enum AVCodecID codec_id
Definition: mov_chan.c:433
static const uint8_t offset[127][2]
Definition: vf_spp.c:92
AVRational avg_frame_rate
Average framerate.
Definition: avformat.h:890
New fields can be added to the end with minor version bumps.
Definition: avformat.h:1161
Libavcodec external API header.
AVInputFormat * av_probe_input_format2(AVProbeData *pd, int is_opened, int *score_max)
Guess the file format.
Definition: format.c:222
int min_distance
Minimum distance between this and the previous keyframe, used to avoid unneeded searching.
Definition: avformat.h:759
int program_num
Definition: avformat.h:1169
AVCodec * audio_codec
Forced audio codec.
Definition: avformat.h:1672
void * opaque
User data.
Definition: avformat.h:1702
Only parse headers, do not repack.
Definition: avformat.h:740
char * format_whitelist
',' separated list of allowed demuxers.
Definition: avformat.h:1642
AVCodecContext * codec
Codec context associated with this stream.
Definition: avformat.h:826
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:4097
static float distance(float x, float y, int band)
const char * mime_type
mime_type, when known.
Definition: avformat.h:417
int buf_size
Size of buf except extra allocated bytes.
Definition: avformat.h:416
unsigned char * buf
Buffer must have AVPROBE_PADDING_SIZE of extra allocated bytes filled with zero.
Definition: avformat.h:415
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:126
unsigned int nb_streams
Number of elements in AVFormatContext.streams.
Definition: avformat.h:1282
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:966
int av_read_pause(AVFormatContext *s)
Pause a network-based stream (e.g.
Definition: utils.c:3562
AVInputFormat * av_find_input_format(const char *short_name)
Find AVInputFormat based on the short name of the input format.
Definition: format.c:160
static void callback(void *priv_data, int index, uint8_t *buf, int buf_size, int64_t time, enum dshowDeviceType devtype)
Definition: dshow.c:159
char filename[1024]
input or output filename
Definition: avformat.h:1302
int update_initial_durations_done
Internal data to prevent doing update_initial_durations() twice.
Definition: avformat.h:1105
enum AVCodecID audio_codec_id
Forced audio codec_id.
Definition: avformat.h:1387
enum AVCodecID av_guess_codec(AVOutputFormat *fmt, const char *short_name, const char *filename, const char *mime_type, enum AVMediaType type)
Guess the codec ID based upon muxer and filename.
Definition: format.c:129
int av_find_default_stream_index(AVFormatContext *s)
Definition: utils.c:1577
void av_format_set_opaque(AVFormatContext *s, void *opaque)
const char * name
Definition: avformat.h:478
Duration estimated from a stream with a known duration.
Definition: avformat.h:1212
uint8_t dts_ordered
Definition: avformat.h:1117
int avoid_negative_ts
Avoid negative timestamps during muxing.
Definition: avformat.h:1526
int(* control_message)(struct AVFormatContext *s, int type, void *data, size_t data_size)
Allows sending messages from application to device.
Definition: avformat.h:550
AVDictionary * metadata
Definition: avformat.h:881
AVOutputFormat * av_guess_format(const char *short_name, const char *filename, const char *mime_type)
Return the output format in the list of registered output formats which best matches the provided par...
Definition: format.c:94
int probe_score
format probing score.
Definition: avformat.h:1619
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:1589
void(* get_output_timestamp)(struct AVFormatContext *s, int stream, int64_t *dts, int64_t *wall)
Definition: avformat.h:545
int(* read_pause)(struct AVFormatContext *)
Pause playing - only meaningful if using a network-based format (RTSP).
Definition: avformat.h:705
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:506
void * av_format_get_opaque(const AVFormatContext *s)
unsigned int probesize
Definition: avformat.h:1363
int(* get_device_list)(struct AVFormatContext *s, struct AVDeviceInfoList *device_list)
Returns device list with it properties.
Definition: avformat.h:567
int av_get_frame_filename(char *buf, int buf_size, const char *path, int number)
Return in 'buf' the path with 'd' replaced by a number.
Definition: utils.c:3822
static void flush(AVCodecContext *avctx)
Definition: aacdec.c:502
uint8_t pts_reorder_error_count[MAX_REORDER_DELAY+1]
Definition: avformat.h:1111
int ts_id
Transport stream id.
Definition: avformat.h:1535
const char * long_name
Descriptive name for the format, meant to be more human-readable than name.
Definition: avformat.h:600
int metadata_header_padding
Number of bytes to be written as padding in a metadata header.
Definition: avformat.h:1695
int av_format_get_probe_score(const AVFormatContext *s)
Definition: utils.c:169
Stream structure.
Definition: avformat.h:807
int(* create_device_capabilities)(struct AVFormatContext *s, struct AVDeviceCapabilitiesQuery *caps)
Initialize device capabilities submodule.
Definition: avformat.h:572
int64_t end
chapter start/end time in time_base units
Definition: avformat.h:1194
int avformat_queue_attached_pictures(AVFormatContext *s)
Definition: utils.c:378
void av_register_output_format(AVOutputFormat *format)
Definition: format.c:71
int avformat_network_deinit(void)
Undo the initialization done by avformat_network_init.
Definition: utils.c:4126
uint8_t dts_misordered
Definition: avformat.h:1118
int64_t pts_reorder_error[MAX_REORDER_DELAY+1]
Internal data to generate dts from pts.
Definition: avformat.h:1110
int64_t end_time
Definition: avformat.h:1181
struct AVOutputFormat * next
Definition: avformat.h:515
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:685
int debug
Flags to enable debugging.
Definition: avformat.h:1478
AVIOContext * pb
I/O context.
Definition: avformat.h:1268
const struct AVCodecTag *const * codec_tag
List of supported codec_id-codec_tag pairs, ordered by "better choice first".
Definition: avformat.h:503
main external API structure.
Definition: avcodec.h:1239
static void(WINAPI *cond_broadcast)(pthread_cond_t *cond)
int io_repositioned
IO repositioned flag.
Definition: avformat.h:1656
int av_filename_number_test(const char *filename)
Check whether filename actually is a numbered sequence generator.
Definition: utils.c:257
void av_format_set_video_codec(AVFormatContext *s, AVCodec *c)
attribute_deprecated int max_analyze_duration
Definition: avformat.h:1369
int(* read_packet)(struct AVFormatContext *, AVPacket *pkt)
Read one packet and put it in 'pkt'.
Definition: avformat.h:669
int pts_wrap_behavior
behavior on wrap detection
Definition: avformat.h:1184
void * buf
Definition: avisynth_c.h:595
double(* duration_error)[2][MAX_STD_TIMEBASES]
Definition: avformat.h:950
GLint GLenum type
Definition: opengl_enc.c:105
int nb_index_entries
Definition: avformat.h:1013
Describe the class of an AVClass context structure.
Definition: log.h:66
int index
Definition: gxfenc.c:89
int(* create_device_capabilities)(struct AVFormatContext *s, struct AVDeviceCapabilitiesQuery *caps)
Initialize device capabilities submodule.
Definition: avformat.h:725
enum AVCodecID subtitle_codec
default subtitle codec
Definition: avformat.h:490
rational number numerator/denominator
Definition: rational.h:43
int64_t last_dts
Definition: avformat.h:946
AVRational display_aspect_ratio
display aspect ratio (0 if unknown)
Definition: avformat.h:1137
AVRational av_stream_get_r_frame_rate(const AVStream *s)
const AVClass * av_class
A class for logging and AVOptions.
Definition: avformat.h:1231
AVMediaType
Definition: avutil.h:192
int(* interleave_packet)(struct AVFormatContext *, AVPacket *out, AVPacket *in, int flush)
Currently only used to set pixel format if not YUV420P.
Definition: avformat.h:534
int64_t fps_last_dts
Definition: avformat.h:968
int found_decoder
0 -> decoder has not been searched for yet.
Definition: avformat.h:959
void avformat_free_context(AVFormatContext *s)
Free an AVFormatContext and all its streams.
Definition: utils.c:3600
This structure contains the data a format has to probe a file.
Definition: avformat.h:413
int av_read_frame(AVFormatContext *s, AVPacket *pkt)
Return the next frame of a stream.
Definition: utils.c:1469
List of devices.
Definition: avdevice.h:459
int avformat_seek_file(AVFormatContext *s, int stream_index, int64_t min_ts, int64_t ts, int64_t max_ts, int flags)
Seek to timestamp ts.
Definition: utils.c:2154
int seek2any
Force seeking to any (also non key) frames.
Definition: avformat.h:1603
full parsing and repack of the first frame only, only implemented for H.264 currently ...
Definition: avformat.h:742
int raw_codec_id
Raw demuxers store their codec ID here.
Definition: avformat.h:639
AVDictionary * metadata
Definition: avformat.h:1167
int64_t codec_info_duration
Definition: avformat.h:951
static int64_t pts
Global timestamp for the audio frames.
int fps_first_dts_idx
Definition: avformat.h:967
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:1311
const char * mime_type
Comma-separated list of mime types.
Definition: avformat.h:625
uint8_t level
Definition: svq3.c:150
#define attribute_deprecated
Definition: attributes.h:86
Duration accurately estimated from PTSes.
Definition: avformat.h:1211
int av_seek_frame(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
Seek to the keyframe at timestamp.
Definition: utils.c:2131
int64_t start
Definition: avformat.h:1194
int64_t duration
Decoding: duration of the stream, in stream time base.
Definition: avformat.h:866
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_dlog(ac->avr,"%dsamples-audio_convert:%sto%s(dithered)\n", len, av_get_sample_fmt_name(ac->in_fmt), av_get_sample_fmt_name(ac->out_fmt));returnff_convert_dither(ac-> out
int64_t interleaver_chunk_duration
Definition: avformat.h:1037
const char * extensions
If extensions are defined, then no probe is done.
Definition: avformat.h:614
const uint8_t * key
Definition: avformat.h:1371
full parsing and repack
Definition: avformat.h:739
int av_interleaved_write_uncoded_frame(AVFormatContext *s, int stream_index, AVFrame *frame)
Write a uncoded frame to an output media file.
Definition: mux.c:1050
struct AVPacketList * next
Definition: avformat.h:1780
int pts_wrap_behavior
Options for behavior, when a wrap is detected.
Definition: avformat.h:1100
int(* read_play)(struct AVFormatContext *)
Start/resume playing - only meaningful if using a network-based format (RTSP).
Definition: avformat.h:699
enum AVCodecID data_codec
default data codec
Definition: avformat.h:578
int avformat_find_stream_info(AVFormatContext *ic, AVDictionary **options)
Read packets of a media file to get stream information.
Definition: utils.c:3019
int64_t start_time
Decoding: pts of the first frame of the stream in presentation order, in stream time base...
Definition: avformat.h:859
AVCodec * video_codec
Forced video codec.
Definition: avformat.h:1664
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:1559
int error_recognition
Error recognition; higher values will detect more errors but may misdetect some more or less valid pa...
Definition: avformat.h:1462
int disposition
AV_DISPOSITION_* bit field.
Definition: avformat.h:870
AVStreamParseType
Definition: avformat.h:737
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:1202
int pts_wrap_bits
number of bits in pts (used for wrapping control)
Definition: avformat.h:973
AVRational time_base
time base in which the start/end timestamps are specified
Definition: avformat.h:1193
av_format_control_message control_message_cb
Callback used by devices to communicate with application.
Definition: avformat.h:1707
int64_t nb_frames
number of frames in this stream if known or 0
Definition: avformat.h:868
struct AVInputFormat * iformat
The input container format.
Definition: avformat.h:1238
int64_t max_analyze_duration2
Maximum duration (in AV_TIME_BASE units) of the data read from input in avformat_find_stream_info().
Definition: avformat.h:1722
void avformat_close_input(AVFormatContext **s)
Close an opened input AVFormatContext.
Definition: utils.c:3635
int av_write_uncoded_frame(AVFormatContext *s, int stream_index, AVFrame *frame)
Write a uncoded frame to an output media file.
Definition: mux.c:1044
int64_t codec_info_duration_fields
Definition: avformat.h:952
unsigned int index_entries_allocated_size
Definition: avformat.h:1014
int64_t mux_ts_offset
Timestamp offset added to timestamps before muxing NOT PART OF PUBLIC API.
Definition: avformat.h:1083
int skip_to_keyframe
Indicates that everything up to the next keyframe should be discarded.
Definition: avformat.h:1051
enum AVCodecID data_codec_id
Forced Data codec_id.
Definition: avformat.h:1746
AVCodec * subtitle_codec
Forced subtitle codec.
Definition: avformat.h:1680
AVCodec * data_codec
Forced data codec.
Definition: avformat.h:1688
enum AVCodecID audio_codec
default audio codec
Definition: avformat.h:488
char * codec_whitelist
',' separated list of allowed decoders.
Definition: avformat.h:1634
int(* get_device_list)(struct AVFormatContext *s, struct AVDeviceInfoList *device_list)
Returns device list with it properties.
Definition: avformat.h:719
int max_chunk_duration
Max chunk time in microseconds.
Definition: avformat.h:1551
struct AVCodecParserContext * parser
Definition: avformat.h:1001
void * priv_data
Format private data.
Definition: avformat.h:1254
int pcr_pid
Definition: avformat.h:1171
int codec_info_nb_frames
Number of frames that have been demuxed during av_find_stream_info()
Definition: avformat.h:997
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:401
AVDiscard
Definition: avcodec.h:658
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:932
int bit_rate
Total stream bitrate in bit/s, 0 if not available.
Definition: avformat.h:1328
int64_t duration
Duration of the stream, in AV_TIME_BASE fractional seconds.
Definition: avformat.h:1321
int avformat_flush(AVFormatContext *s)
Discard all internally buffered data.
Definition: utils.c:2210
void av_format_set_metadata_header_padding(AVFormatContext *s, int c)
int64_t last_IP_pts
Definition: avformat.h:985
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:713
const char * name
A comma separated list of short names for the format.
Definition: avformat.h:593
void av_hex_dump_log(void *avcl, int level, const uint8_t *buf, int size)
Send a nice hexadecimal dump of a buffer to the log.
Definition: dump.c:77
int fps_last_dts_idx
Definition: avformat.h:969
AVRational time_base
This is the fundamental unit of time (in seconds) in terms of which frame timestamps are represented...
Definition: avformat.h:849
struct AVInputFormat * next
Definition: avformat.h:634
AVCodec * av_format_get_data_codec(const AVFormatContext *s)
#define MKTAG(a, b, c, d)
Definition: common.h:319
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:486
enum AVDiscard discard
Selects which packets can be discarded at will and do not need to be demuxed.
Definition: avformat.h:872
AVRational r_frame_rate
Real base framerate of the stream.
Definition: avformat.h:1027
AVInputFormat * av_probe_input_format(AVProbeData *pd, int is_opened)
Guess the file format.
Definition: format.c:233
const char * mime_type
Definition: avformat.h:485
int request_probe
stream probing state -1 -> probing finished 0 -> no probing requested rest -> perform probing with re...
Definition: avformat.h:1046
Following API allows user to probe device capabilities (supported codecs, pixel formats, sample formats, resolutions, channel counts, etc).
Definition: avdevice.h:399
int use_wallclock_as_timestamps
forces the use of wallclock timestamps as pts/dts of packets This has undefined results in the presen...
Definition: avformat.h:1567
This structure stores compressed data.
Definition: avcodec.h:1137
void av_register_all(void)
Initialize libavformat and register all the muxers, demuxers and protocols.
Definition: allformats.c:51
int(* write_trailer)(struct AVFormatContext *)
Definition: avformat.h:530
#define MAX_STD_TIMEBASES
Stream information used internally by av_find_stream_info()
Definition: avformat.h:944
const struct AVCodecTag *const * codec_tag
Definition: avformat.h:616
int64_t av_stream_get_end_pts(const AVStream *st)
Returns the pts of the last muxed packet + its duration.
Definition: utils.c:116
AVPacket attached_pic
For streams with AV_DISPOSITION_ATTACHED_PIC disposition, this packet will contain the attached pictu...
Definition: avformat.h:899
struct AVPacketList * last_in_packet_buffer
last packet in packet_buffer for this stream when muxing.
Definition: avformat.h:1006
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:1071
AVProgram ** programs
Definition: avformat.h:1375
struct AVStream::@136 * info