lavf doxy: document passing options to demuxers.
[libav.git] / libavformat / avformat.h
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1/*
2 * copyright (c) 2001 Fabrice Bellard
3 *
2912e87a 4 * This file is part of Libav.
b78e7197 5 *
2912e87a 6 * Libav is free software; you can redistribute it and/or
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7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
b78e7197 9 * version 2.1 of the License, or (at your option) any later version.
04d7f601 10 *
2912e87a 11 * Libav is distributed in the hope that it will be useful,
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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
2912e87a 17 * License along with Libav; if not, write to the Free Software
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18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19 */
20
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21#ifndef AVFORMAT_AVFORMAT_H
22#define AVFORMAT_AVFORMAT_H
de6d9b64 23
e361b508 24/**
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25 * @file
26 * @ingroup libavf
27 * Main libavformat public API header
28 */
29
30/**
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31 * @defgroup libavf I/O and Muxing/Demuxing Library
32 * @{
33 *
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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 Libav 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 *
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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 *
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81 * @defgroup lavf_decoding Demuxing
82 * @{
59826cab 83 * Demuxers read a media file and split it into chunks of data (@em packets). A
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84 * @ref AVPacket "packet" contains one or more encoded frames which belongs to a
85 * single elementary stream. In the lavf API this process is represented by the
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86 * avformat_open_input() function for opening a file, av_read_frame() for
87 * reading a single packet and finally avformat_close_input(), which does the
88 * cleanup.
89 *
90 * @section lavf_decoding_open Opening a media file
91 * The minimum information required to open a file is its URL or filename, which
92 * is passed to avformat_open_input(), as in the following code:
93 * @code
94 * const char *url = "in.mp3";
95 * AVFormatContext *s = NULL;
96 * int ret = avformat_open_input(&s, url, NULL, NULL);
97 * if (ret < 0)
98 * abort();
99 * @endcode
100 * The above code attempts to allocate an AVFormatContext, open the
101 * specified file (autodetecting the format) and read the header, exporting the
102 * information stored there into s. Some formats do not have a header or do not
103 * store enough information there, so it is recommended that you call the
104 * avformat_find_stream_info() function which tries to read and decode a few
105 * frames to find missing information.
106 *
107 * In some cases you might want to preallocate an AVFormatContext yourself with
108 * avformat_alloc_context() and do some tweaking on it before passing it to
109 * avformat_open_input(). One such case is when you want to use custom functions
110 * for reading input data instead of lavf internal I/O layer.
111 * To do that, create your own AVIOContext with avio_alloc_context(), passing
112 * your reading callbacks to it. Then set the @em pb field of your
113 * AVFormatContext to newly created AVIOContext.
114 *
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115 * Since the format of the opened file is in general not known until after
116 * avformat_open_input() has returned, it is not possible to set demuxer private
117 * options on a preallocated context. Instead, the options should be passed to
118 * avformat_open_input() wrapped in an AVDictionary:
119 * @code
120 * AVDictionary *options = NULL;
121 * av_dict_set(&options, "video_size", "640x480", 0);
122 * av_dict_set(&options, "pixel_format", "rgb24", 0);
123 *
124 * if (avformat_open_input(&s, url, NULL, &options) < 0)
125 * abort();
126 * av_dict_free(&options);
127 * @endcode
128 * This code passes the private options 'video_size' and 'pixel_format' to the
129 * demuxer. They would be necessary for e.g. the rawvideo demuxer, since it
130 * cannot know how to interpret raw video data otherwise. If the format turns
131 * out to be something different than raw video, those options will not be
132 * recognized by the demuxer and therefore will not be applied. Such unrecognized
133 * options are then returned in the options dictionary (recognized options are
134 * consumed). The calling program can handle such unrecognized options as it
135 * wishes, e.g.
136 * @code
137 * AVDictionaryEntry *e;
138 * if (e = av_dict_get(options, "", NULL, AV_DICT_IGNORE_SUFFIX)) {
139 * fprintf(stderr, "Option %s not recognized by the demuxer.\n", e->key);
140 * abort();
141 * }
142 * @endcode
143 *
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144 * After you have finished reading the file, you must close it with
145 * avformat_close_input(). It will free everything associated with the file.
146 *
147 * @section lavf_decoding_read Reading from an opened file
148 *
149 * @section lavf_decoding_seek Seeking
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150 * @}
151 *
152 * @defgroup lavf_encoding Muxing
153 * @{
154 * @}
155 *
e4f4a1f9 156 * @defgroup lavf_io I/O Read/Write
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157 * @{
158 * @}
159 *
160 * @defgroup lavf_codec Demuxers
161 * @{
162 * @defgroup lavf_codec_native Native Demuxers
163 * @{
164 * @}
165 * @defgroup lavf_codec_wrappers External library wrappers
166 * @{
167 * @}
168 * @}
169 * @defgroup lavf_protos I/O Protocols
170 * @{
171 * @}
172 * @defgroup lavf_internal Internal
173 * @{
174 * @}
175 * @}
176 *
177 */
072e3efd 178
f71869a4 179#include <time.h>
67070e4f 180#include <stdio.h> /* FILE */
76a448ed 181#include "libavcodec/avcodec.h"
d9f80ea2 182#include "libavutil/dict.h"
abc78a5a 183#include "libavutil/log.h"
de6d9b64 184
de6d9b64 185#include "avio.h"
50196a98 186#include "libavformat/version.h"
de6d9b64 187
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188struct AVFormatContext;
189
a6d18a0e 190
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191/**
192 * @defgroup metadata_api Public Metadata API
193 * @{
b262a059 194 * @ingroup libavf
ea29242c 195 * The metadata API allows libavformat to export metadata tags to a client
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196 * application when demuxing. Conversely it allows a client application to
197 * set metadata when muxing.
198 *
199 * Metadata is exported or set as pairs of key/value strings in the 'metadata'
200 * fields of the AVFormatContext, AVStream, AVChapter and AVProgram structs
201 * using the @ref lavu_dict "AVDictionary" API. Like all strings in Libav,
202 * metadata is assumed to be UTF-8 encoded Unicode. Note that metadata
61648423 203 * exported by demuxers isn't checked to be valid UTF-8 in most cases.
28b4c06b 204 *
ea29242c 205 * Important concepts to keep in mind:
1a53a438 206 * - Keys are unique; there can never be 2 tags with the same key. This is
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207 * also meant semantically, i.e., a demuxer should not knowingly produce
208 * several keys that are literally different but semantically identical.
209 * E.g., key=Author5, key=Author6. In this example, all authors must be
210 * placed in the same tag.
1a53a438 211 * - Metadata is flat, not hierarchical; there are no subtags. If you
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212 * want to store, e.g., the email address of the child of producer Alice
213 * and actor Bob, that could have key=alice_and_bobs_childs_email_address.
1a53a438 214 * - Several modifiers can be applied to the tag name. This is done by
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215 * appending a dash character ('-') and the modifier name in the order
216 * they appear in the list below -- e.g. foo-eng-sort, not foo-sort-eng.
1a53a438 217 * - language -- a tag whose value is localized for a particular language
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218 * is appended with the ISO 639-2/B 3-letter language code.
219 * For example: Author-ger=Michael, Author-eng=Mike
220 * The original/default language is in the unqualified "Author" tag.
221 * A demuxer should set a default if it sets any translated tag.
1a53a438 222 * - sorting -- a modified version of a tag that should be used for
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223 * sorting will have '-sort' appended. E.g. artist="The Beatles",
224 * artist-sort="Beatles, The".
225 *
1a53a438 226 * - Demuxers attempt to export metadata in a generic format, however tags
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227 * with no generic equivalents are left as they are stored in the container.
228 * Follows a list of generic tag names:
ca76a119 229 *
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230 @verbatim
231 album -- name of the set this work belongs to
232 album_artist -- main creator of the set/album, if different from artist.
233 e.g. "Various Artists" for compilation albums.
234 artist -- main creator of the work
235 comment -- any additional description of the file.
236 composer -- who composed the work, if different from artist.
237 copyright -- name of copyright holder.
238 creation_time-- date when the file was created, preferably in ISO 8601.
239 date -- date when the work was created, preferably in ISO 8601.
240 disc -- number of a subset, e.g. disc in a multi-disc collection.
241 encoder -- name/settings of the software/hardware that produced the file.
242 encoded_by -- person/group who created the file.
243 filename -- original name of the file.
244 genre -- <self-evident>.
245 language -- main language in which the work is performed, preferably
246 in ISO 639-2 format. Multiple languages can be specified by
247 separating them with commas.
248 performer -- artist who performed the work, if different from artist.
249 E.g for "Also sprach Zarathustra", artist would be "Richard
250 Strauss" and performer "London Philharmonic Orchestra".
251 publisher -- name of the label/publisher.
252 service_name -- name of the service in broadcasting (channel name).
253 service_provider -- name of the service provider in broadcasting.
254 title -- name of the work.
255 track -- number of this work in the set, can be in form current/total.
256 variant_bitrate -- the total bitrate of the bitrate variant that the current stream is part of
257 @endverbatim
258 *
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259 * Look in the examples section for an application example how to use the Metadata API.
260 *
1a53a438 261 * @}
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262 */
263
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264/* packet functions */
265
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266
267/**
49bd8e4b 268 * Allocate and read the payload of a packet and initialize its
d1b9adf2 269 * fields with default values.
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270 *
271 * @param pkt packet
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272 * @param size desired payload size
273 * @return >0 (read size) if OK, AVERROR_xxx otherwise
3217cb42 274 */
ae628ec1 275int av_get_packet(AVIOContext *s, AVPacket *pkt, int size);
3217cb42 276
de6d9b64 277
6bfc2683 278/**
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279 * Read data and append it to the current content of the AVPacket.
280 * If pkt->size is 0 this is identical to av_get_packet.
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281 * Note that this uses av_grow_packet and thus involves a realloc
282 * which is inefficient. Thus this function should only be used
283 * when there is no reasonable way to know (an upper bound of)
284 * the final size.
285 *
286 * @param pkt packet
287 * @param size amount of data to read
288 * @return >0 (read size) if OK, AVERROR_xxx otherwise, previous data
289 * will not be lost even if an error occurs.
290 */
ae628ec1 291int av_append_packet(AVIOContext *s, AVPacket *pkt, int size);
6bfc2683 292
de6d9b64 293/*************************************************/
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294/* fractional numbers for exact pts handling */
295
671adb17 296/**
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297 * The exact value of the fractional number is: 'val + num / den'.
298 * num is assumed to be 0 <= num < den.
4c08b2bd 299 */
916c80e9 300typedef struct AVFrac {
115329f1 301 int64_t val, num, den;
52e57500 302} AVFrac;
916c80e9 303
916c80e9 304/*************************************************/
b9a281db 305/* input/output formats */
de6d9b64 306
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307struct AVCodecTag;
308
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309/**
310 * This structure contains the data a format has to probe a file.
311 */
b9a281db 312typedef struct AVProbeData {
5c91a675 313 const char *filename;
e5f58f81 314 unsigned char *buf; /**< Buffer must have AVPROBE_PADDING_SIZE of extra allocated bytes filled with zero. */
315 int buf_size; /**< Size of buf except extra allocated bytes */
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316} AVProbeData;
317
22e77e44 318#define AVPROBE_SCORE_MAX 100 ///< maximum score, half of that is used for file-extension-based detection
87e87886 319#define AVPROBE_PADDING_SIZE 32 ///< extra allocated bytes at the end of the probe buffer
de6d9b64 320
c68fafe0 321/// Demuxer will use avio_open, no opened file should be provided by the caller.
40d9c544 322#define AVFMT_NOFILE 0x0001
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323#define AVFMT_NEEDNUMBER 0x0002 /**< Needs '%d' in filename. */
324#define AVFMT_SHOW_IDS 0x0008 /**< Show format stream IDs numbers. */
325#define AVFMT_RAWPICTURE 0x0020 /**< Format wants AVPicture structure for
326 raw picture data. */
327#define AVFMT_GLOBALHEADER 0x0040 /**< Format wants global header. */
328#define AVFMT_NOTIMESTAMPS 0x0080 /**< Format does not need / have any timestamps. */
329#define AVFMT_GENERIC_INDEX 0x0100 /**< Use generic index building code. */
58ec7e00 330#define AVFMT_TS_DISCONT 0x0200 /**< Format allows timestamp discontinuities. Note, muxers always require valid (monotone) timestamps */
25918212 331#define AVFMT_VARIABLE_FPS 0x0400 /**< Format allows variable fps. */
ab5a0175 332#define AVFMT_NODIMENSIONS 0x0800 /**< Format does not need width/height */
bb62d5c1 333#define AVFMT_NOSTREAMS 0x1000 /**< Format does not require any streams */
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334#define AVFMT_NOBINSEARCH 0x2000 /**< Format does not allow to fallback to binary search via read_timestamp */
335#define AVFMT_NOGENSEARCH 0x4000 /**< Format does not allow to fallback to generic search */
b631fba9 336#define AVFMT_NO_BYTE_SEEK 0x8000 /**< Format does not allow seeking by bytes */
f1caf01d 337#define AVFMT_ALLOW_FLUSH 0x10000 /**< Format allows flushing. If not set, the muxer will not receive a NULL packet in the write_packet function. */
b9a281db 338
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339/**
340 * @addtogroup lavf_encoding
341 * @{
342 */
b9a281db 343typedef struct AVOutputFormat {
de6d9b64 344 const char *name;
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345 /**
346 * Descriptive name for the format, meant to be more human-readable
819174fa 347 * than name. You should use the NULL_IF_CONFIG_SMALL() macro
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348 * to define it.
349 */
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350 const char *long_name;
351 const char *mime_type;
4f57fa8c 352 const char *extensions; /**< comma-separated filename extensions */
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353 /* output support */
354 enum CodecID audio_codec; /**< default audio codec */
355 enum CodecID video_codec; /**< default video codec */
356 enum CodecID subtitle_codec; /**< default subtitle codec */
357 /**
358 * can use flags: AVFMT_NOFILE, AVFMT_NEEDNUMBER, AVFMT_RAWPICTURE,
359 * AVFMT_GLOBALHEADER, AVFMT_NOTIMESTAMPS, AVFMT_VARIABLE_FPS,
360 * AVFMT_NODIMENSIONS, AVFMT_NOSTREAMS, AVFMT_ALLOW_FLUSH
361 */
362 int flags;
363
364 /**
365 * List of supported codec_id-codec_tag pairs, ordered by "better
366 * choice first". The arrays are all terminated by CODEC_ID_NONE.
367 */
368 const struct AVCodecTag * const *codec_tag;
369
370
371 const AVClass *priv_class; ///< AVClass for the private context
372
373 /*****************************************************************
374 * No fields below this line are part of the public API. They
375 * may not be used outside of libavformat and can be changed and
376 * removed at will.
377 * New public fields should be added right above.
378 *****************************************************************
379 */
380 struct AVOutputFormat *next;
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381 /**
382 * size of private data so that it can be allocated in the wrapper
383 */
b9a281db 384 int priv_data_size;
183eaa9a 385
de6d9b64 386 int (*write_header)(struct AVFormatContext *);
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387 /**
388 * Write a packet. If AVFMT_ALLOW_FLUSH is set in flags,
389 * pkt can be NULL in order to flush data buffered in the muxer.
390 * When flushing, return 0 if there still is more data to flush,
391 * or 1 if everything was flushed and there is no more buffered
392 * data.
393 */
e928649b 394 int (*write_packet)(struct AVFormatContext *, AVPacket *pkt);
de6d9b64 395 int (*write_trailer)(struct AVFormatContext *);
76c56376 396 /**
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397 * Currently only used to set pixel format if not YUV420P.
398 */
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399 int (*interleave_packet)(struct AVFormatContext *, AVPacket *out,
400 AVPacket *in, int flush);
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401 /**
402 * Test if the given codec can be stored in this container.
403 *
404 * @return 1 if the codec is supported, 0 if it is not.
405 * A negative number if unknown.
406 */
407 int (*query_codec)(enum CodecID id, int std_compliance);
b9a281db 408} AVOutputFormat;
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409/**
410 * @}
411 */
de6d9b64 412
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413/**
414 * @addtogroup lavf_decoding
415 * @{
416 */
b9a281db 417typedef struct AVInputFormat {
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418 /**
419 * A comma separated list of short names for the format. New names
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420 * may be appended with a minor bump.
421 */
b9a281db 422 const char *name;
76c56376 423
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424 /**
425 * Descriptive name for the format, meant to be more human-readable
819174fa 426 * than name. You should use the NULL_IF_CONFIG_SMALL() macro
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427 * to define it.
428 */
b9a281db 429 const char *long_name;
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430
431 /**
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432 * Can use flags: AVFMT_NOFILE, AVFMT_NEEDNUMBER, AVFMT_SHOW_IDS,
433 * AVFMT_GENERIC_INDEX, AVFMT_TS_DISCONT, AVFMT_NOBINSEARCH,
434 * AVFMT_NOGENSEARCH, AVFMT_NO_BYTE_SEEK.
435 */
436 int flags;
437
438 /**
439 * If extensions are defined, then no probe is done. You should
440 * usually not use extension format guessing because it is not
441 * reliable enough
442 */
443 const char *extensions;
444
445 const struct AVCodecTag * const *codec_tag;
446
447 const AVClass *priv_class; ///< AVClass for the private context
448
449 /*****************************************************************
450 * No fields below this line are part of the public API. They
451 * may not be used outside of libavformat and can be changed and
452 * removed at will.
453 * New public fields should be added right above.
454 *****************************************************************
455 */
456 struct AVInputFormat *next;
457
458 /**
f7fe41a0 459 * Raw demuxers store their codec ID here.
183eaa9a 460 */
f7fe41a0 461 int raw_codec_id;
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462
463 /**
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464 * Size of private data so that it can be allocated in the wrapper.
465 */
b9a281db 466 int priv_data_size;
76c56376 467
65d7d68b 468 /**
22e77e44 469 * Tell if a given file has a chance of being parsed as this format.
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470 * The buffer provided is guaranteed to be AVPROBE_PADDING_SIZE bytes
471 * big so you do not have to check for that unless you need more.
65d7d68b 472 */
b9a281db 473 int (*read_probe)(AVProbeData *);
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474
475 /**
476 * Read the format header and initialize the AVFormatContext
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477 * structure. Return 0 if OK. Only used in raw format right
478 * now. 'avformat_new_stream' should be called to create new streams.
76c56376 479 */
6e9651d1 480 int (*read_header)(struct AVFormatContext *);
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481
482 /**
483 * Read one packet and put it in 'pkt'. pts and flags are also
6b8b0fe2 484 * set. 'avformat_new_stream' can be called only if the flag
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485 * AVFMTCTX_NOHEADER is used and only in the calling thread (not in a
486 * background thread).
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487 * @return 0 on success, < 0 on error.
488 * When returning an error, pkt must not have been allocated
489 * or must be freed before returning
490 */
de6d9b64 491 int (*read_packet)(struct AVFormatContext *, AVPacket *pkt);
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492
493 /**
494 * Close the stream. The AVFormatContext and AVStreams are not
495 * freed by this function
496 */
de6d9b64 497 int (*read_close)(struct AVFormatContext *);
1de2db8f 498
115329f1 499 /**
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500 * Seek to a given timestamp relative to the frames in
501 * stream component stream_index.
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502 * @param stream_index Must not be -1.
503 * @param flags Selects which direction should be preferred if no exact
504 * match is available.
05ce0f11 505 * @return >= 0 on success (but not necessarily the new offset)
3ba1438d 506 */
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507 int (*read_seek)(struct AVFormatContext *,
508 int stream_index, int64_t timestamp, int flags);
509
8d14a25c 510 /**
58c42af7 511 * Get the next timestamp in stream[stream_index].time_base units.
d9526386 512 * @return the timestamp or AV_NOPTS_VALUE if an error occurred
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513 */
514 int64_t (*read_timestamp)(struct AVFormatContext *s, int stream_index,
515 int64_t *pos, int64_t pos_limit);
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516
517 /**
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518 * Start/resume playing - only meaningful if using a network-based format
519 * (RTSP).
520 */
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521 int (*read_play)(struct AVFormatContext *);
522
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523 /**
524 * Pause playing - only meaningful if using a network-based format
525 * (RTSP).
526 */
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527 int (*read_pause)(struct AVFormatContext *);
528
1de2db8f 529 /**
49bd8e4b 530 * Seek to timestamp ts.
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531 * Seeking will be done so that the point from which all active streams
532 * can be presented successfully will be closest to ts and within min/max_ts.
533 * Active streams are all streams that have AVStream.discard < AVDISCARD_ALL.
534 */
882fb0a3 535 int (*read_seek2)(struct AVFormatContext *s, int stream_index, int64_t min_ts, int64_t ts, int64_t max_ts, int flags);
b9a281db 536} AVInputFormat;
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537/**
538 * @}
539 */
de6d9b64 540
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541enum AVStreamParseType {
542 AVSTREAM_PARSE_NONE,
543 AVSTREAM_PARSE_FULL, /**< full parsing and repack */
4f57fa8c 544 AVSTREAM_PARSE_HEADERS, /**< Only parse headers, do not repack. */
78cb7273 545 AVSTREAM_PARSE_TIMESTAMPS, /**< full parsing and interpolation of timestamps for frames not starting on a packet boundary */
74a6df59 546 AVSTREAM_PARSE_FULL_ONCE, /**< full parsing and repack of the first frame only, only implemented for H.264 currently */
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547};
548
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549typedef struct AVIndexEntry {
550 int64_t pos;
551 int64_t timestamp;
552#define AVINDEX_KEYFRAME 0x0001
30a43f2d 553 int flags:2;
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554 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).
555 int min_distance; /**< Minimum distance between this and the previous keyframe, used to avoid unneeded searching. */
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556} AVIndexEntry;
557
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558#define AV_DISPOSITION_DEFAULT 0x0001
559#define AV_DISPOSITION_DUB 0x0002
560#define AV_DISPOSITION_ORIGINAL 0x0004
561#define AV_DISPOSITION_COMMENT 0x0008
562#define AV_DISPOSITION_LYRICS 0x0010
563#define AV_DISPOSITION_KARAOKE 0x0020
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564
565/**
566 * Track should be used during playback by default.
567 * Useful for subtitle track that should be displayed
568 * even when user did not explicitly ask for subtitles.
569 */
7a617a86 570#define AV_DISPOSITION_FORCED 0x0040
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571#define AV_DISPOSITION_HEARING_IMPAIRED 0x0080 /**< stream for hearing impaired audiences */
572#define AV_DISPOSITION_VISUAL_IMPAIRED 0x0100 /**< stream for visual impaired audiences */
24a83bd1 573#define AV_DISPOSITION_CLEAN_EFFECTS 0x0200 /**< stream without voice */
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574/**
575 * The stream is stored in the file as an attached picture/"cover art" (e.g.
576 * APIC frame in ID3v2). The single packet associated with it will be returned
577 * among the first few packets read from the file unless seeking takes place.
578 * It can also be accessed at any time in AVStream.attached_pic.
579 */
580#define AV_DISPOSITION_ATTACHED_PIC 0x0400
90c2295b 581
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582/**
583 * Stream structure.
584 * New fields can be added to the end with minor version bumps.
8bfb108b 585 * Removal, reordering and changes to existing fields require a major
ba66ae94 586 * version bump.
8bfb108b 587 * sizeof(AVStream) must not be used outside libav*.
ba66ae94 588 */
de6d9b64 589typedef struct AVStream {
43d414ba 590 int index; /**< stream index in AVFormatContext */
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591 /**
592 * Format-specific stream ID.
593 * decoding: set by libavformat
594 * encoding: set by the user
595 */
596 int id;
43d414ba 597 AVCodecContext *codec; /**< codec context */
b4b87d48 598 /**
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599 * Real base framerate of the stream.
600 * This is the lowest framerate with which all timestamps can be
864ff8c1 601 * represented accurately (it is the least common multiple of all
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602 * framerates in the stream). Note, this value is just a guess!
603 * For example, if the time base is 1/90000 and all frames have either
4f57fa8c 604 * approximately 3600 or 1800 timer ticks, then r_frame_rate will be 50/1.
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605 */
606 AVRational r_frame_rate;
de6d9b64 607 void *priv_data;
82583548 608
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609 /**
610 * encoding: pts generation when outputting stream
611 */
a9fd2b19 612 struct AVFrac pts;
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613
614 /**
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615 * This is the fundamental unit of time (in seconds) in terms
616 * of which frame timestamps are represented. For fixed-fps content,
22e77e44 617 * time base should be 1/framerate and timestamp increments should be 1.
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618 * decoding: set by libavformat
619 * encoding: set by libavformat in av_write_header
5b28c8c3 620 */
9ee91c2f 621 AVRational time_base;
76c56376 622
6d96a9b9 623 /**
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624 * Decoding: pts of the first frame of the stream, in stream time base.
625 * Only set this if you are absolutely 100% sure that the value you set
626 * it to really is the pts of the first frame.
4854c253 627 * This may be undefined (AV_NOPTS_VALUE).
6d96a9b9 628 */
115329f1 629 int64_t start_time;
76c56376 630
e26381b6 631 /**
8bfb108b 632 * Decoding: duration of the stream, in stream time base.
e26381b6 633 * If a source file does not specify a duration, but does specify
4f57fa8c 634 * a bitrate, this value will be estimated from bitrate and file size.
e26381b6 635 */
ee404803 636 int64_t duration;
fb2758c8 637
b4b87d48 638 int64_t nb_frames; ///< number of frames in this stream if known or 0
504ee036 639
4f57fa8c 640 int disposition; /**< AV_DISPOSITION_* bit field */
0bef08e5 641
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642 enum AVDiscard discard; ///< Selects which packets can be discarded at will and do not need to be demuxed.
643
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644 /**
645 * sample aspect ratio (0 if unknown)
646 * - encoding: Set by user.
647 * - decoding: Set by libavformat.
648 */
649 AVRational sample_aspect_ratio;
f526adaf 650
d2d67e42 651 AVDictionary *metadata;
3a41c2f7 652
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653 /**
654 * Average framerate
655 */
656 AVRational avg_frame_rate;
6c6e6ef5 657
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658 /**
659 * For streams with AV_DISPOSITION_ATTACHED_PIC disposition, this packet
660 * will contain the attached picture.
661 *
662 * decoding: set by libavformat, must not be modified by the caller.
663 * encoding: unused
664 */
665 AVPacket attached_pic;
666
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667 /*****************************************************************
668 * All fields below this line are not part of the public API. They
669 * may not be used outside of libavformat and can be changed and
670 * removed at will.
671 * New public fields should be added right above.
672 *****************************************************************
673 */
674
6c6e6ef5 675 /**
da9cea77 676 * Stream information used internally by av_find_stream_info()
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677 */
678#define MAX_STD_TIMEBASES (60*12+5)
679 struct {
680 int64_t last_dts;
681 int64_t duration_gcd;
682 int duration_count;
683 double duration_error[MAX_STD_TIMEBASES];
684 int64_t codec_info_duration;
38a4be3f 685 int nb_decoded_frames;
8c1d6ac6 686 int found_decoder;
fd0368e7 687 } *info;
ee42df8a 688
ee42df8a 689 int pts_wrap_bits; /**< number of bits in pts (used for wrapping control) */
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690
691 // Timestamp generation support:
692 /**
693 * Timestamp corresponding to the last dts sync point.
694 *
695 * Initialized when AVCodecParserContext.dts_sync_point >= 0 and
696 * a DTS is received from the underlying container. Otherwise set to
697 * AV_NOPTS_VALUE by default.
698 */
699 int64_t reference_dts;
700 int64_t first_dts;
701 int64_t cur_dts;
9a174562 702 int64_t last_IP_pts;
ee42df8a 703 int last_IP_duration;
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704
705 /**
706 * Number of packets to buffer for codec probing
707 */
708#define MAX_PROBE_PACKETS 2500
709 int probe_packets;
710
711 /**
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712 * Number of frames that have been demuxed during av_find_stream_info()
713 */
714 int codec_info_nb_frames;
715
716 /* av_read_frame() support */
717 enum AVStreamParseType need_parsing;
718 struct AVCodecParserContext *parser;
719
720 /**
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721 * last packet in packet_buffer for this stream when muxing.
722 */
723 struct AVPacketList *last_in_packet_buffer;
724 AVProbeData probe_data;
725#define MAX_REORDER_DELAY 16
726 int64_t pts_buffer[MAX_REORDER_DELAY+1];
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727
728 AVIndexEntry *index_entries; /**< Only used if the format does not
729 support seeking natively. */
730 int nb_index_entries;
731 unsigned int index_entries_allocated_size;
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732} AVStream;
733
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734#define AV_PROGRAM_RUNNING 1
735
ba66ae94 736/**
ba66ae94 737 * New fields can be added to the end with minor version bumps.
8bfb108b 738 * Removal, reordering and changes to existing fields require a major
ba66ae94 739 * version bump.
8bfb108b 740 * sizeof(AVProgram) must not be used outside libav*.
ba66ae94 741 */
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742typedef struct AVProgram {
743 int id;
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744 int flags;
745 enum AVDiscard discard; ///< selects which program to discard and which to feed to the caller
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746 unsigned int *stream_index;
747 unsigned int nb_stream_indexes;
d2d67e42 748 AVDictionary *metadata;
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749} AVProgram;
750
43d414ba 751#define AVFMTCTX_NOHEADER 0x0001 /**< signal that no header is present
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752 (streams are added dynamically) */
753
79d7836a 754typedef struct AVChapter {
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755 int id; ///< unique ID to identify the chapter
756 AVRational time_base; ///< time base in which the start/end timestamps are specified
8931e7b4 757 int64_t start, end; ///< chapter start/end time in time_base units
d2d67e42 758 AVDictionary *metadata;
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759} AVChapter;
760
252f17e2 761/**
4f57fa8c 762 * Format I/O context.
252f17e2 763 * New fields can be added to the end with minor version bumps.
8bfb108b 764 * Removal, reordering and changes to existing fields require a major
252f17e2 765 * version bump.
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766 * sizeof(AVFormatContext) must not be used outside libav*, use
767 * avformat_alloc_context() to create an AVFormatContext.
252f17e2 768 */
de6d9b64 769typedef struct AVFormatContext {
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770 /**
771 * A class for logging and AVOptions. Set by avformat_alloc_context().
772 * Exports (de)muxer private options if they exist.
773 */
774 const AVClass *av_class;
775
776 /**
777 * Can only be iformat or oformat, not both at the same time.
778 *
779 * decoding: set by avformat_open_input().
780 * encoding: set by the user.
781 */
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782 struct AVInputFormat *iformat;
783 struct AVOutputFormat *oformat;
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784
785 /**
786 * Format private data. This is an AVOptions-enabled struct
787 * if and only if iformat/oformat.priv_class is not NULL.
788 */
de6d9b64 789 void *priv_data;
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790
791 /*
792 * I/O context.
793 *
794 * decoding: either set by the user before avformat_open_input() (then
795 * the user must close it manually) or set by avformat_open_input().
796 * encoding: set by the user.
797 *
798 * Do NOT set this field if AVFMT_NOFILE flag is set in
799 * iformat/oformat.flags. In such a case, the (de)muxer will handle
800 * I/O in some other way and this field will be NULL.
801 */
ae628ec1 802 AVIOContext *pb;
83daced0 803
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804 /* stream info */
805 int ctx_flags; /**< Format-specific flags, see AVFMTCTX_xx */
806
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807 /**
808 * A list of all streams in the file. New streams are created with
809 * avformat_new_stream().
810 *
811 * decoding: streams are created by libavformat in avformat_open_input().
812 * If AVFMTCTX_NOHEADER is set in ctx_flags, then new streams may also
813 * appear in av_read_frame().
814 * encoding: streams are created by the user before avformat_write_header().
815 */
db69c2e5 816 unsigned int nb_streams;
38aab35f 817 AVStream **streams;
83daced0 818
43d414ba 819 char filename[1024]; /**< input or output filename */
ee404803 820
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821 /**
822 * Decoding: position of the first frame of the component, in
823 * AV_TIME_BASE fractional seconds. NEVER set this value directly:
824 * It is deduced from the AVStream values.
825 */
115329f1 826 int64_t start_time;
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827
828 /**
829 * Decoding: duration of the stream, in AV_TIME_BASE fractional
830 * seconds. Only set this value if you know none of the individual stream
da9cea77 831 * durations and also do not set any of them. This is deduced from the
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832 * AVStream values if not set.
833 */
ee404803 834 int64_t duration;
76c56376 835
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836 /**
837 * Decoding: total stream bitrate in bit/s, 0 if not
838 * available. Never set it directly if the file_size and the
6001dad6 839 * duration are known as Libav can compute it automatically.
76c56376 840 */
ee404803 841 int bit_rate;
fb2758c8 842
92400be2 843 unsigned int packet_size;
17c88cb0 844 int max_delay;
8108551a 845
30bc6613 846 int flags;
22e77e44 847#define AVFMT_FLAG_GENPTS 0x0001 ///< Generate missing pts even if it requires parsing future frames.
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848#define AVFMT_FLAG_IGNIDX 0x0002 ///< Ignore index.
849#define AVFMT_FLAG_NONBLOCK 0x0004 ///< Do not block when reading packets from input.
c55806e3 850#define AVFMT_FLAG_IGNDTS 0x0008 ///< Ignore DTS on frames that contain both DTS & PTS
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851#define AVFMT_FLAG_NOFILLIN 0x0010 ///< Do not infer any values from other values, just return what is stored in the container
852#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
05e84c95 853#define AVFMT_FLAG_CUSTOM_IO 0x0080 ///< The caller has supplied a custom AVIOContext, don't avio_close() it.
73e8e8db 854#define AVFMT_FLAG_DISCARD_CORRUPT 0x0100 ///< Discard frames marked corrupted
5894e1bb 855
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856 /**
857 * decoding: size of data to probe; encoding: unused.
858 */
9e6c9470 859 unsigned int probesize;
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860
861 /**
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862 * decoding: maximum time (in AV_TIME_BASE units) during which the input should
863 * be analyzed in avformat_find_stream_info().
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864 */
865 int max_analyze_duration;
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866
867 const uint8_t *key;
868 int keylen;
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869
870 unsigned int nb_programs;
871 AVProgram **programs;
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872
873 /**
874 * Forced video codec_id.
4f57fa8c 875 * Demuxing: Set by user.
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876 */
877 enum CodecID video_codec_id;
76c56376 878
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879 /**
880 * Forced audio codec_id.
4f57fa8c 881 * Demuxing: Set by user.
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882 */
883 enum CodecID audio_codec_id;
76c56376 884
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885 /**
886 * Forced subtitle codec_id.
4f57fa8c 887 * Demuxing: Set by user.
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888 */
889 enum CodecID subtitle_codec_id;
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890
891 /**
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892 * Maximum amount of memory in bytes to use for the index of each stream.
893 * If the index exceeds this size, entries will be discarded as
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894 * needed to maintain a smaller size. This can lead to slower or less
895 * accurate seeking (depends on demuxer).
4f57fa8c 896 * Demuxers for which a full in-memory index is mandatory will ignore
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897 * this.
898 * muxing : unused
899 * demuxing: set by user
900 */
901 unsigned int max_index_size;
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902
903 /**
ffa71b2b 904 * Maximum amount of memory in bytes to use for buffering frames
4f57fa8c 905 * obtained from realtime capture devices.
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906 */
907 unsigned int max_picture_buffer;
79d7836a 908
fbabf1e9 909 unsigned int nb_chapters;
79d7836a 910 AVChapter **chapters;
45b2b05f 911
d2d67e42 912 AVDictionary *metadata;
af122d6a 913
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914 /**
915 * Start time of the stream in real world time, in microseconds
916 * since the unix epoch (00:00 1st January 1970). That is, pts=0
917 * in the stream was captured at this real world time.
918 * - encoding: Set by user.
919 * - decoding: Unused.
920 */
921 int64_t start_time_realtime;
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922
923 /**
924 * decoding: number of frames used to probe fps
925 */
926 int fps_probe_size;
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927
928 /**
929 * Error recognition; higher values will detect more errors but may
930 * misdetect some more or less valid parts as errors.
931 * - encoding: unused
932 * - decoding: Set by user.
933 */
934 int error_recognition;
df968050 935
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936 /**
937 * Custom interrupt callbacks for the I/O layer.
938 *
939 * decoding: set by the user before avformat_open_input().
940 * encoding: set by the user before avformat_write_header()
941 * (mainly useful for AVFMT_NOFILE formats). The callback
942 * should also be passed to avio_open2() if it's used to
943 * open the file.
944 */
945 AVIOInterruptCB interrupt_callback;
946
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947 /**
948 * Flags to enable debugging.
949 */
950 int debug;
951#define FF_FDEBUG_TS 0x0001
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952 /*****************************************************************
953 * All fields below this line are not part of the public API. They
954 * may not be used outside of libavformat and can be changed and
955 * removed at will.
956 * New public fields should be added right above.
957 *****************************************************************
958 */
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959
960 /**
961 * This buffer is only needed when packets were already buffered but
962 * not decoded, for example to get the codec parameters in MPEG
963 * streams.
964 */
965 struct AVPacketList *packet_buffer;
966 struct AVPacketList *packet_buffer_end;
967
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968 /* av_seek_frame() support */
969 int64_t data_offset; /**< offset of the first packet */
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970
971 /**
972 * Raw packets from the demuxer, prior to parsing and decoding.
973 * This buffer is used for buffering packets until the codec can
974 * be identified, as parsing cannot be done without knowing the
975 * codec.
976 */
977 struct AVPacketList *raw_packet_buffer;
978 struct AVPacketList *raw_packet_buffer_end;
979 /**
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980 * Packets split by the parser get queued here.
981 */
982 struct AVPacketList *parse_queue;
983 struct AVPacketList *parse_queue_end;
984 /**
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985 * Remaining size available for raw_packet_buffer, in bytes.
986 */
987#define RAW_PACKET_BUFFER_SIZE 2500000
988 int raw_packet_buffer_remaining_size;
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989} AVFormatContext;
990
991typedef struct AVPacketList {
992 AVPacket pkt;
993 struct AVPacketList *next;
994} AVPacketList;
995
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996
997/**
998 * @defgroup lavf_core Core functions
999 * @ingroup libavf
1000 *
1001 * Functions for querying libavformat capabilities, allocating core structures,
1002 * etc.
1003 * @{
1004 */
1005
1006/**
1007 * Return the LIBAVFORMAT_VERSION_INT constant.
1008 */
1009unsigned avformat_version(void);
1010
1011/**
1012 * Return the libavformat build-time configuration.
1013 */
1014const char *avformat_configuration(void);
1015
1016/**
1017 * Return the libavformat license.
1018 */
1019const char *avformat_license(void);
1020
1021/**
1022 * Initialize libavformat and register all the muxers, demuxers and
1023 * protocols. If you do not call this function, then you can select
1024 * exactly which formats you want to support.
1025 *
1026 * @see av_register_input_format()
1027 * @see av_register_output_format()
1028 * @see av_register_protocol()
1029 */
1030void av_register_all(void);
1031
1032void av_register_input_format(AVInputFormat *format);
1033void av_register_output_format(AVOutputFormat *format);
1034
1035/**
1036 * Do global initialization of network components. This is optional,
1037 * but recommended, since it avoids the overhead of implicitly
1038 * doing the setup for each session.
1039 *
1040 * Calling this function will become mandatory if using network
1041 * protocols at some major version bump.
1042 */
1043int avformat_network_init(void);
1044
1045/**
1046 * Undo the initialization done by avformat_network_init.
1047 */
1048int avformat_network_deinit(void);
1049
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1050/**
1051 * If f is NULL, returns the first registered input format,
22e77e44 1052 * if f is non-NULL, returns the next registered input format after f
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1053 * or NULL if f is the last one.
1054 */
84be6e72 1055AVInputFormat *av_iformat_next(AVInputFormat *f);
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1056
1057/**
1058 * If f is NULL, returns the first registered output format,
22e77e44 1059 * if f is non-NULL, returns the next registered output format after f
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1060 * or NULL if f is the last one.
1061 */
84be6e72 1062AVOutputFormat *av_oformat_next(AVOutputFormat *f);
de6d9b64 1063
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1064/**
1065 * Allocate an AVFormatContext.
1066 * avformat_free_context() can be used to free the context and everything
1067 * allocated by the framework within it.
1068 */
1069AVFormatContext *avformat_alloc_context(void);
1070
1071/**
1072 * Free an AVFormatContext and all its streams.
1073 * @param s context to free
1074 */
1075void avformat_free_context(AVFormatContext *s);
1076
1077/**
1078 * Get the AVClass for AVFormatContext. It can be used in combination with
1079 * AV_OPT_SEARCH_FAKE_OBJ for examining options.
1080 *
1081 * @see av_opt_find().
1082 */
1083const AVClass *avformat_get_class(void);
1084
1085/**
1086 * Add a new stream to a media file.
1087 *
1088 * When demuxing, it is called by the demuxer in read_header(). If the
1089 * flag AVFMTCTX_NOHEADER is set in s.ctx_flags, then it may also
1090 * be called in read_packet().
1091 *
1092 * When muxing, should be called by the user before avformat_write_header().
1093 *
1094 * @param c If non-NULL, the AVCodecContext corresponding to the new stream
1095 * will be initialized to use this codec. This is needed for e.g. codec-specific
1096 * defaults to be set, so codec should be provided if it is known.
1097 *
1098 * @return newly created stream or NULL on error.
1099 */
1100AVStream *avformat_new_stream(AVFormatContext *s, AVCodec *c);
1101
1102AVProgram *av_new_program(AVFormatContext *s, int id);
1103
1104/**
1105 * @}
1106 */
1107
1108
370f27de 1109/**
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1110 * @addtogroup lavf_decoding
1111 * @{
1112 */
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1113
1114/**
49bd8e4b 1115 * Find AVInputFormat based on the short name of the input format.
3217cb42 1116 */
b9a281db 1117AVInputFormat *av_find_input_format(const char *short_name);
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1118
1119/**
49bd8e4b 1120 * Guess the file format.
3217cb42 1121 *
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1122 * @param is_opened Whether the file is already opened; determines whether
1123 * demuxers with or without AVFMT_NOFILE are probed.
3217cb42 1124 */
94988531 1125AVInputFormat *av_probe_input_format(AVProbeData *pd, int is_opened);
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1126
1127/**
49bd8e4b 1128 * Guess the file format.
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1129 *
1130 * @param is_opened Whether the file is already opened; determines whether
1131 * demuxers with or without AVFMT_NOFILE are probed.
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1132 * @param score_max A probe score larger that this is required to accept a
1133 * detection, the variable is set to the actual detection
1134 * score afterwards.
1135 * If the score is <= AVPROBE_SCORE_MAX / 4 it is recommended
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1136 * to retry with a larger probe buffer.
1137 */
1138AVInputFormat *av_probe_input_format2(AVProbeData *pd, int is_opened, int *score_max);
1139
1140/**
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1141 * Probe a bytestream to determine the input format. Each time a probe returns
1142 * with a score that is too low, the probe buffer size is increased and another
1143 * attempt is made. When the maximum probe size is reached, the input format
1144 * with the highest score is returned.
1145 *
1146 * @param pb the bytestream to probe
1147 * @param fmt the input format is put here
1148 * @param filename the filename of the stream
1149 * @param logctx the log context
1150 * @param offset the offset within the bytestream to probe from
1151 * @param max_probe_size the maximum probe buffer size (zero for default)
1152 * @return 0 in case of success, a negative value corresponding to an
1153 * AVERROR code otherwise
1154 */
ae628ec1 1155int av_probe_input_buffer(AVIOContext *pb, AVInputFormat **fmt,
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1156 const char *filename, void *logctx,
1157 unsigned int offset, unsigned int max_probe_size);
1158
88808c60 1159/**
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1160 * Open an input stream and read the header. The codecs are not opened.
1161 * The stream must be closed with av_close_input_file().
1162 *
1163 * @param ps Pointer to user-supplied AVFormatContext (allocated by avformat_alloc_context).
1164 * May be a pointer to NULL, in which case an AVFormatContext is allocated by this
1165 * function and written into ps.
1166 * Note that a user-supplied AVFormatContext will be freed on failure.
1167 * @param filename Name of the stream to open.
1168 * @param fmt If non-NULL, this parameter forces a specific input format.
1169 * Otherwise the format is autodetected.
1170 * @param options A dictionary filled with AVFormatContext and demuxer-private options.
1171 * On return this parameter will be destroyed and replaced with a dict containing
1172 * options that were not found. May be NULL.
1173 *
1174 * @return 0 on success, a negative AVERROR on failure.
1175 *
1176 * @note If you want to use custom IO, preallocate the format context and set its pb field.
1177 */
1178int avformat_open_input(AVFormatContext **ps, const char *filename, AVInputFormat *fmt, AVDictionary **options);
1179
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1180/**
1181 * Read packets of a media file to get stream information. This
1182 * is useful for file formats with no headers such as MPEG. This
1183 * function also computes the real framerate in case of MPEG-2 repeat
1184 * frame mode.
1185 * The logical file position is not changed by this function;
1186 * examined packets may be buffered for later processing.
1187 *
1188 * @param ic media file handle
1189 * @param options If non-NULL, an ic.nb_streams long array of pointers to
1190 * dictionaries, where i-th member contains options for
1191 * codec corresponding to i-th stream.
1192 * On return each dictionary will be filled with options that were not found.
1193 * @return >=0 if OK, AVERROR_xxx on error
1194 *
1195 * @note this function isn't guaranteed to open all the codecs, so
1196 * options being non-empty at return is a perfectly normal behavior.
1197 *
1198 * @todo Let the user decide somehow what information is needed so that
1199 * we do not waste time getting stuff the user does not need.
1200 */
1201int avformat_find_stream_info(AVFormatContext *ic, AVDictionary **options);
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1202
1203/**
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1204 * Find the "best" stream in the file.
1205 * The best stream is determined according to various heuristics as the most
1206 * likely to be what the user expects.
1207 * If the decoder parameter is non-NULL, av_find_best_stream will find the
1208 * default decoder for the stream's codec; streams for which no decoder can
1209 * be found are ignored.
1210 *
1211 * @param ic media file handle
1212 * @param type stream type: video, audio, subtitles, etc.
1213 * @param wanted_stream_nb user-requested stream number,
1214 * or -1 for automatic selection
1215 * @param related_stream try to find a stream related (eg. in the same
1216 * program) to this one, or -1 if none
1217 * @param decoder_ret if non-NULL, returns the decoder for the
1218 * selected stream
1219 * @param flags flags; none are currently defined
1220 * @return the non-negative stream number in case of success,
1221 * AVERROR_STREAM_NOT_FOUND if no stream with the requested type
1222 * could be found,
1223 * AVERROR_DECODER_NOT_FOUND if streams were found but no decoder
1224 * @note If av_find_best_stream returns successfully and decoder_ret is not
1225 * NULL, then *decoder_ret is guaranteed to be set to a valid AVCodec.
1226 */
1227int av_find_best_stream(AVFormatContext *ic,
1228 enum AVMediaType type,
1229 int wanted_stream_nb,
1230 int related_stream,
1231 AVCodec **decoder_ret,
1232 int flags);
1233
3c90cc2e 1234#if FF_API_READ_PACKET
9128ae08 1235/**
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1236 * @deprecated use AVFMT_FLAG_NOFILLIN | AVFMT_FLAG_NOPARSE to read raw
1237 * unprocessed packets
1238 *
49bd8e4b 1239 * Read a transport packet from a media file.
3217cb42 1240 *
864ff8c1 1241 * This function is obsolete and should never be used.
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1242 * Use av_read_frame() instead.
1243 *
1244 * @param s media file handle
1245 * @param pkt is filled
4f57fa8c 1246 * @return 0 if OK, AVERROR_xxx on error
3217cb42 1247 */
3c90cc2e 1248attribute_deprecated
de6d9b64 1249int av_read_packet(AVFormatContext *s, AVPacket *pkt);
3c90cc2e 1250#endif
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1251
1252/**
49bd8e4b 1253 * Return the next frame of a stream.
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1254 * This function returns what is stored in the file, and does not validate
1255 * that what is there are valid frames for the decoder. It will split what is
1256 * stored in the file into frames and return one for each call. It will not
1257 * omit invalid data between valid frames so as to give the decoder the maximum
1258 * information possible for decoding.
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1259 *
1260 * The returned packet is valid
1261 * until the next av_read_frame() or until av_close_input_file() and
1262 * must be freed with av_free_packet. For video, the packet contains
1263 * exactly one frame. For audio, it contains an integer number of
1264 * frames if each frame has a known fixed size (e.g. PCM or ADPCM
1265 * data). If the audio frames have a variable size (e.g. MPEG audio),
1266 * then it contains one frame.
1267 *
1268 * pkt->pts, pkt->dts and pkt->duration are always set to correct
22e77e44 1269 * values in AVStream.time_base units (and guessed if the format cannot
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1270 * provide them). pkt->pts can be AV_NOPTS_VALUE if the video format
1271 * has B-frames, so it is better to rely on pkt->dts if you do not
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1272 * decompress the payload.
1273 *
4f57fa8c 1274 * @return 0 if OK, < 0 on error or end of file
3217cb42 1275 */
fb2758c8 1276int av_read_frame(AVFormatContext *s, AVPacket *pkt);
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1277
1278/**
49bd8e4b 1279 * Seek to the keyframe at timestamp.
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1280 * 'timestamp' in 'stream_index'.
1281 * @param stream_index If stream_index is (-1), a default
1282 * stream is selected, and timestamp is automatically converted
1283 * from AV_TIME_BASE units to the stream specific time_base.
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1284 * @param timestamp Timestamp in AVStream.time_base units
1285 * or, if no stream is specified, in AV_TIME_BASE units.
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1286 * @param flags flags which select direction and seeking mode
1287 * @return >= 0 on success
1288 */
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1289int av_seek_frame(AVFormatContext *s, int stream_index, int64_t timestamp,
1290 int flags);
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1291
1292/**
49bd8e4b 1293 * Seek to timestamp ts.
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1294 * Seeking will be done so that the point from which all active streams
1295 * can be presented successfully will be closest to ts and within min/max_ts.
1296 * Active streams are all streams that have AVStream.discard < AVDISCARD_ALL.
1297 *
22e77e44 1298 * If flags contain AVSEEK_FLAG_BYTE, then all timestamps are in bytes and
d04768fa 1299 * are the file position (this may not be supported by all demuxers).
22e77e44 1300 * If flags contain AVSEEK_FLAG_FRAME, then all timestamps are in frames
d04768fa 1301 * in the stream with stream_index (this may not be supported by all demuxers).
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1302 * Otherwise all timestamps are in units of the stream selected by stream_index
1303 * or if stream_index is -1, in AV_TIME_BASE units.
1304 * If flags contain AVSEEK_FLAG_ANY, then non-keyframes are treated as
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1305 * keyframes (this may not be supported by all demuxers).
1306 *
22e77e44 1307 * @param stream_index index of the stream which is used as time base reference
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1308 * @param min_ts smallest acceptable timestamp
1309 * @param ts target timestamp
1310 * @param max_ts largest acceptable timestamp
1311 * @param flags flags
32e543f8 1312 * @return >=0 on success, error code otherwise
998b6f7c 1313 *
8a4d7a30 1314 * @note This is part of the new seek API which is still under construction.
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1315 * Thus do not use this yet. It may change at any time, do not expect
1316 * ABI compatibility yet!
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1317 */
1318int avformat_seek_file(AVFormatContext *s, int stream_index, int64_t min_ts, int64_t ts, int64_t max_ts, int flags);
1319
1320/**
49bd8e4b 1321 * Start playing a network-based stream (e.g. RTSP stream) at the
4f57fa8c 1322 * current position.
3217cb42 1323 */
fb2758c8 1324int av_read_play(AVFormatContext *s);
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1325
1326/**
49bd8e4b 1327 * Pause a network-based stream (e.g. RTSP stream).
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1328 *
1329 * Use av_read_play() to resume it.
1330 */
fb2758c8 1331int av_read_pause(AVFormatContext *s);
3217cb42 1332
52660454 1333#if FF_API_CLOSE_INPUT_FILE
2506fd54 1334/**
52660454 1335 * @deprecated use avformat_close_input()
49bd8e4b 1336 * Close a media file (but not its codecs).
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1337 *
1338 * @param s media file handle
1339 */
52660454 1340attribute_deprecated
de6d9b64 1341void av_close_input_file(AVFormatContext *s);
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1342#endif
1343
1344/**
1345 * Close an opened input AVFormatContext. Free it and all its contents
1346 * and set *s to NULL.
1347 */
1348void avformat_close_input(AVFormatContext **s);
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1349/**
1350 * @}
1351 */
3217cb42 1352
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1353#define AVSEEK_FLAG_BACKWARD 1 ///< seek backward
1354#define AVSEEK_FLAG_BYTE 2 ///< seeking based on position in bytes
4f57fa8c 1355#define AVSEEK_FLAG_ANY 4 ///< seek to any frame, even non-keyframes
2bf74f49 1356#define AVSEEK_FLAG_FRAME 8 ///< seeking based on frame number
3ba1438d 1357
3217cb42 1358/**
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1359 * @addtogroup lavf_encoding
1360 * @{
1361 */
f3bfe388 1362/**
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1363 * Allocate the stream private data and write the stream header to
1364 * an output media file.
1365 *
1366 * @param s Media file handle, must be allocated with avformat_alloc_context().
1367 * Its oformat field must be set to the desired output format;
1368 * Its pb field must be set to an already openened AVIOContext.
1369 * @param options An AVDictionary filled with AVFormatContext and muxer-private options.
1370 * On return this parameter will be destroyed and replaced with a dict containing
1371 * options that were not found. May be NULL.
1372 *
1373 * @return 0 on success, negative AVERROR on failure.
1374 *
1375 * @see av_opt_find, av_dict_set, avio_open, av_oformat_next.
1376 */
1377int avformat_write_header(AVFormatContext *s, AVDictionary **options);
1378
3217cb42 1379/**
49bd8e4b 1380 * Write a packet to an output media file.
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1381 *
1382 * The packet shall contain one audio or video frame.
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1383 * The packet must be correctly interleaved according to the container
1384 * specification, if not then av_interleaved_write_frame must be used.
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1385 *
1386 * @param s media file handle
78cb7273 1387 * @param pkt The packet, which contains the stream_index, buf/buf_size,
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1388 * dts/pts, ...
1389 * This can be NULL (at any time, not just at the end), in
1390 * order to immediately flush data buffered within the muxer,
1391 * for muxers that buffer up data internally before writing it
1392 * to the output.
1393 * @return < 0 on error, = 0 if OK, 1 if flushed and there is no more data to flush
3217cb42 1394 */
e928649b 1395int av_write_frame(AVFormatContext *s, AVPacket *pkt);
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1396
1397/**
49bd8e4b 1398 * Write a packet to an output media file ensuring correct interleaving.
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1399 *
1400 * The packet must contain one audio or video frame.
22e77e44 1401 * If the packets are already correctly interleaved, the application should
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1402 * call av_write_frame() instead as it is slightly faster. It is also important
1403 * to keep in mind that completely non-interleaved input will need huge amounts
1404 * of memory to interleave with this, so it is preferable to interleave at the
1405 * demuxer level.
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1406 *
1407 * @param s media file handle
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1408 * @param pkt The packet containing the data to be written. Libavformat takes
1409 * ownership of the data and will free it when it sees fit using the packet's
1410 * @ref AVPacket.destruct "destruct" field. The caller must not access the data
1411 * after this function returns, as it may already be freed.
1412 * Packet's @ref AVPacket.stream_index "stream_index" field must be set to the
1413 * index of the corresponding stream in @ref AVFormatContext.streams
1414 * "s.streams".
1415 * It is very strongly recommended that timing information (@ref AVPacket.pts
1416 * "pts", @ref AVPacket.dts "dts" @ref AVPacket.duration "duration") is set to
1417 * correct values.
1418 *
1419 * @return 0 on success, a negative AVERROR on error.
3217cb42 1420 */
3c895fc0 1421int av_interleaved_write_frame(AVFormatContext *s, AVPacket *pkt);
3217cb42 1422
a6733202 1423#if FF_API_INTERLEAVE_PACKET
3217cb42 1424/**
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1425 * @deprecated this function was never meant to be called by the user
1426 * programs.
3217cb42 1427 */
a6733202 1428attribute_deprecated
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1429int av_interleave_packet_per_dts(AVFormatContext *s, AVPacket *out,
1430 AVPacket *pkt, int flush);
a6733202 1431#endif
e928649b 1432
3217cb42 1433/**
49bd8e4b 1434 * Write the stream trailer to an output media file and free the
2b75bde6 1435 * file private data.
3217cb42 1436 *
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1437 * May only be called after a successful call to av_write_header.
1438 *
3217cb42 1439 * @param s media file handle
4f57fa8c 1440 * @return 0 if OK, AVERROR_xxx on error
3217cb42 1441 */
b9a281db 1442int av_write_trailer(AVFormatContext *s);
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1443
1444/**
1445 * Return the output format in the list of registered output formats
1446 * which best matches the provided parameters, or return NULL if
1447 * there is no match.
1448 *
1449 * @param short_name if non-NULL checks if short_name matches with the
1450 * names of the registered formats
1451 * @param filename if non-NULL checks if filename terminates with the
1452 * extensions of the registered formats
1453 * @param mime_type if non-NULL checks if mime_type matches with the
1454 * MIME type of the registered formats
1455 */
1456AVOutputFormat *av_guess_format(const char *short_name,
1457 const char *filename,
1458 const char *mime_type);
1459
1460/**
1461 * Guess the codec ID based upon muxer and filename.
1462 */
1463enum CodecID av_guess_codec(AVOutputFormat *fmt, const char *short_name,
1464 const char *filename, const char *mime_type,
1465 enum AVMediaType type);
1466
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1467/**
1468 * @}
1469 */
de6d9b64 1470
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1471
1472/**
1473 * @defgroup lavf_misc Utility functions
1474 * @ingroup libavf
1475 * @{
1476 *
1477 * Miscelaneous utility functions related to both muxing and demuxing
1478 * (or neither).
1479 */
1480
1481/**
1482 * Send a nice hexadecimal dump of a buffer to the specified file stream.
1483 *
1484 * @param f The file stream pointer where the dump should be sent to.
1485 * @param buf buffer
1486 * @param size buffer size
1487 *
1488 * @see av_hex_dump_log, av_pkt_dump2, av_pkt_dump_log2
1489 */
1490void av_hex_dump(FILE *f, uint8_t *buf, int size);
1491
1492/**
1493 * Send a nice hexadecimal dump of a buffer to the log.
1494 *
1495 * @param avcl A pointer to an arbitrary struct of which the first field is a
1496 * pointer to an AVClass struct.
1497 * @param level The importance level of the message, lower values signifying
1498 * higher importance.
1499 * @param buf buffer
1500 * @param size buffer size
1501 *
1502 * @see av_hex_dump, av_pkt_dump2, av_pkt_dump_log2
1503 */
1504void av_hex_dump_log(void *avcl, int level, uint8_t *buf, int size);
1505
1506/**
1507 * Send a nice dump of a packet to the specified file stream.
1508 *
1509 * @param f The file stream pointer where the dump should be sent to.
1510 * @param pkt packet to dump
1511 * @param dump_payload True if the payload must be displayed, too.
1512 * @param st AVStream that the packet belongs to
1513 */
1514void av_pkt_dump2(FILE *f, AVPacket *pkt, int dump_payload, AVStream *st);
1515
1516
1517/**
1518 * Send a nice dump of a packet to the log.
1519 *
1520 * @param avcl A pointer to an arbitrary struct of which the first field is a
1521 * pointer to an AVClass struct.
1522 * @param level The importance level of the message, lower values signifying
1523 * higher importance.
1524 * @param pkt packet to dump
1525 * @param dump_payload True if the payload must be displayed, too.
1526 * @param st AVStream that the packet belongs to
1527 */
1528void av_pkt_dump_log2(void *avcl, int level, AVPacket *pkt, int dump_payload,
1529 AVStream *st);
1530
1531/**
1532 * Get the CodecID for the given codec tag tag.
1533 * If no codec id is found returns CODEC_ID_NONE.
1534 *
1535 * @param tags list of supported codec_id-codec_tag pairs, as stored
1536 * in AVInputFormat.codec_tag and AVOutputFormat.codec_tag
1537 */
1538enum CodecID av_codec_get_id(const struct AVCodecTag * const *tags, unsigned int tag);
1539
1540/**
1541 * Get the codec tag for the given codec id id.
1542 * If no codec tag is found returns 0.
1543 *
1544 * @param tags list of supported codec_id-codec_tag pairs, as stored
1545 * in AVInputFormat.codec_tag and AVOutputFormat.codec_tag
1546 */
1547unsigned int av_codec_get_tag(const struct AVCodecTag * const *tags, enum CodecID id);
1548
1549int av_find_default_stream_index(AVFormatContext *s);
1550
1551/**
1552 * Get the index for a specific timestamp.
1553 * @param flags if AVSEEK_FLAG_BACKWARD then the returned index will correspond
1554 * to the timestamp which is <= the requested one, if backward
1555 * is 0, then it will be >=
1556 * if AVSEEK_FLAG_ANY seek to any frame, only keyframes otherwise
1557 * @return < 0 if no such timestamp could be found
1558 */
1559int av_index_search_timestamp(AVStream *st, int64_t timestamp, int flags);
1560
1561/**
1562 * Add an index entry into a sorted list. Update the entry if the list
1563 * already contains it.
1564 *
1565 * @param timestamp timestamp in the time base of the given stream
1566 */
1567int av_add_index_entry(AVStream *st, int64_t pos, int64_t timestamp,
1568 int size, int distance, int flags);
1569
1570
1571/**
1572 * Split a URL string into components.
1573 *
1574 * The pointers to buffers for storing individual components may be null,
1575 * in order to ignore that component. Buffers for components not found are
1576 * set to empty strings. If the port is not found, it is set to a negative
1577 * value.
1578 *
1579 * @param proto the buffer for the protocol
1580 * @param proto_size the size of the proto buffer
1581 * @param authorization the buffer for the authorization
1582 * @param authorization_size the size of the authorization buffer
1583 * @param hostname the buffer for the host name
1584 * @param hostname_size the size of the hostname buffer
1585 * @param port_ptr a pointer to store the port number in
1586 * @param path the buffer for the path
1587 * @param path_size the size of the path buffer
1588 * @param url the URL to split
1589 */
1590void av_url_split(char *proto, int proto_size,
1591 char *authorization, int authorization_size,
1592 char *hostname, int hostname_size,
1593 int *port_ptr,
1594 char *path, int path_size,
1595 const char *url);
1596
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1597
1598void av_dump_format(AVFormatContext *ic,
1599 int index,
1600 const char *url,
1601 int is_output);
3217cb42 1602
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1603/**
1604 * Get the current time in microseconds.
1605 */
0c1a9eda 1606int64_t av_gettime(void);
94988531 1607
3217cb42 1608/**
49bd8e4b 1609 * Return in 'buf' the path with '%d' replaced by a number.
4f57fa8c 1610 *
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1611 * Also handles the '%0nd' format where 'n' is the total number
1612 * of digits and '%%'.
1613 *
1614 * @param buf destination buffer
1615 * @param buf_size destination buffer size
1616 * @param path numbered sequence string
8ea0e802 1617 * @param number frame number
4f57fa8c 1618 * @return 0 if OK, -1 on format error
3217cb42 1619 */
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1620int av_get_frame_filename(char *buf, int buf_size,
1621 const char *path, int number);
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1622
1623/**
49bd8e4b 1624 * Check whether filename actually is a numbered sequence generator.
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1625 *
1626 * @param filename possible numbered sequence string
4f57fa8c 1627 * @return 1 if a valid numbered sequence string, 0 otherwise
3217cb42 1628 */
5c07cf53 1629int av_filename_number_test(const char *filename);
96baaa6a 1630
c5388c07 1631/**
49bd8e4b 1632 * Generate an SDP for an RTP session.
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1633 *
1634 * @param ac array of AVFormatContexts describing the RTP streams. If the
1635 * array is composed by only one context, such context can contain
1636 * multiple AVStreams (one AVStream per RTP stream). Otherwise,
1637 * all the contexts in the array (an AVCodecContext per RTP stream)
4f57fa8c 1638 * must contain only one AVStream.
8767b80f 1639 * @param n_files number of AVCodecContexts contained in ac
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1640 * @param buf buffer where the SDP will be stored (must be allocated by
1641 * the caller)
8767b80f 1642 * @param size the size of the buffer
4f57fa8c 1643 * @return 0 if OK, AVERROR_xxx on error
c5388c07 1644 */
c234d40b 1645int av_sdp_create(AVFormatContext *ac[], int n_files, char *buf, int size);
c3675dfe 1646
1a70d127 1647/**
49bd8e4b 1648 * Return a positive value if the given filename has one of the given
1a70d127
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1649 * extensions, 0 otherwise.
1650 *
1651 * @param extensions a comma-separated list of filename extensions
1652 */
1653int av_match_ext(const char *filename, const char *extensions);
1654
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1655/**
1656 * Test if the given container can store a codec.
1657 *
1658 * @param std_compliance standards compliance level, one of FF_COMPLIANCE_*
1659 *
1660 * @return 1 if codec with ID codec_id can be stored in ofmt, 0 if it cannot.
1661 * A negative number if this information is not available.
1662 */
1663int avformat_query_codec(AVOutputFormat *ofmt, enum CodecID codec_id, int std_compliance);
1664
abf2c2d7 1665/**
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1666 * @defgroup riff_fourcc RIFF FourCCs
1667 * @{
1668 * Get the tables mapping RIFF FourCCs to libavcodec CodecIDs. The tables are
1669 * meant to be passed to av_codec_get_id()/av_codec_get_tag() as in the
1670 * following code:
1671 * @code
1672 * uint32_t tag = MKTAG('H', '2', '6', '4');
1673 * const struct AVCodecTag *table[] = { avformat_get_riff_video_tags(), 0 };
1674 * enum CodecID id = av_codec_get_id(table, tag);
1675 * @endcode
1676 */
1677/**
1678 * @return the table mapping RIFF FourCCs for video to libavcodec CodecID.
1679 */
1680const struct AVCodecTag *avformat_get_riff_video_tags(void);
1681/**
1682 * @return the table mapping RIFF FourCCs for audio to CodecID.
1683 */
1684const struct AVCodecTag *avformat_get_riff_audio_tags(void);
1685/**
1686 * @}
1687 */
1688
1689/**
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1690 * @}
1691 */
1692
98790382 1693#endif /* AVFORMAT_AVFORMAT_H */