avformat: Avoid a warning about mixed declarations and code
[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
072e3efd 24
c97429e2 25/**
7ed0a77f 26 * Return the LIBAVFORMAT_VERSION_INT constant.
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27 */
28unsigned avformat_version(void);
29
c1736936 30/**
49bd8e4b 31 * Return the libavformat build-time configuration.
c1736936 32 */
41600690 33const char *avformat_configuration(void);
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34
35/**
49bd8e4b 36 * Return the libavformat license.
c1736936 37 */
41600690 38const char *avformat_license(void);
c1736936 39
f71869a4 40#include <time.h>
67070e4f 41#include <stdio.h> /* FILE */
76a448ed 42#include "libavcodec/avcodec.h"
d9f80ea2 43#include "libavutil/dict.h"
abc78a5a 44#include "libavutil/log.h"
de6d9b64 45
de6d9b64 46#include "avio.h"
50196a98 47#include "libavformat/version.h"
de6d9b64 48
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49struct AVFormatContext;
50
a6d18a0e 51
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52/**
53 * @defgroup metadata_api Public Metadata API
54 * @{
ea29242c 55 * The metadata API allows libavformat to export metadata tags to a client
2912e87a 56 * application using a sequence of key/value pairs. Like all strings in Libav,
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57 * metadata must be stored as UTF-8 encoded Unicode. Note that metadata
58 * exported by demuxers isn't checked to be valid UTF-8 in most cases.
ea29242c 59 * Important concepts to keep in mind:
1a53a438 60 * - Keys are unique; there can never be 2 tags with the same key. This is
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61 * also meant semantically, i.e., a demuxer should not knowingly produce
62 * several keys that are literally different but semantically identical.
63 * E.g., key=Author5, key=Author6. In this example, all authors must be
64 * placed in the same tag.
1a53a438 65 * - Metadata is flat, not hierarchical; there are no subtags. If you
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66 * want to store, e.g., the email address of the child of producer Alice
67 * and actor Bob, that could have key=alice_and_bobs_childs_email_address.
1a53a438 68 * - Several modifiers can be applied to the tag name. This is done by
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69 * appending a dash character ('-') and the modifier name in the order
70 * they appear in the list below -- e.g. foo-eng-sort, not foo-sort-eng.
1a53a438 71 * - language -- a tag whose value is localized for a particular language
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72 * is appended with the ISO 639-2/B 3-letter language code.
73 * For example: Author-ger=Michael, Author-eng=Mike
74 * The original/default language is in the unqualified "Author" tag.
75 * A demuxer should set a default if it sets any translated tag.
1a53a438 76 * - sorting -- a modified version of a tag that should be used for
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77 * sorting will have '-sort' appended. E.g. artist="The Beatles",
78 * artist-sort="Beatles, The".
79 *
1a53a438 80 * - Demuxers attempt to export metadata in a generic format, however tags
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81 * with no generic equivalents are left as they are stored in the container.
82 * Follows a list of generic tag names:
ca76a119 83 *
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84 @verbatim
85 album -- name of the set this work belongs to
86 album_artist -- main creator of the set/album, if different from artist.
87 e.g. "Various Artists" for compilation albums.
88 artist -- main creator of the work
89 comment -- any additional description of the file.
90 composer -- who composed the work, if different from artist.
91 copyright -- name of copyright holder.
92 creation_time-- date when the file was created, preferably in ISO 8601.
93 date -- date when the work was created, preferably in ISO 8601.
94 disc -- number of a subset, e.g. disc in a multi-disc collection.
95 encoder -- name/settings of the software/hardware that produced the file.
96 encoded_by -- person/group who created the file.
97 filename -- original name of the file.
98 genre -- <self-evident>.
99 language -- main language in which the work is performed, preferably
100 in ISO 639-2 format. Multiple languages can be specified by
101 separating them with commas.
102 performer -- artist who performed the work, if different from artist.
103 E.g for "Also sprach Zarathustra", artist would be "Richard
104 Strauss" and performer "London Philharmonic Orchestra".
105 publisher -- name of the label/publisher.
106 service_name -- name of the service in broadcasting (channel name).
107 service_provider -- name of the service provider in broadcasting.
108 title -- name of the work.
109 track -- number of this work in the set, can be in form current/total.
110 variant_bitrate -- the total bitrate of the bitrate variant that the current stream is part of
111 @endverbatim
112 *
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113 * Look in the examples section for an application example how to use the Metadata API.
114 *
1a53a438 115 * @}
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116 */
117
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118#if FF_API_OLD_METADATA2
119/**
120 * @defgroup old_metadata Old metadata API
121 * The following functions are deprecated, use
122 * their equivalents from libavutil/dict.h instead.
123 * @{
124 */
a6d18a0e 125
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126#define AV_METADATA_MATCH_CASE AV_DICT_MATCH_CASE
127#define AV_METADATA_IGNORE_SUFFIX AV_DICT_IGNORE_SUFFIX
128#define AV_METADATA_DONT_STRDUP_KEY AV_DICT_DONT_STRDUP_KEY
129#define AV_METADATA_DONT_STRDUP_VAL AV_DICT_DONT_STRDUP_VAL
130#define AV_METADATA_DONT_OVERWRITE AV_DICT_DONT_OVERWRITE
131
132typedef attribute_deprecated AVDictionary AVMetadata;
133typedef attribute_deprecated AVDictionaryEntry AVMetadataTag;
a6d18a0e 134
f610a9f2 135typedef struct AVMetadataConv AVMetadataConv;
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136
137/**
49bd8e4b 138 * Get a metadata element with matching key.
26cc5310 139 *
22e77e44 140 * @param prev Set to the previous matching element to find the next.
66b6c745 141 * If set to NULL the first matching element is returned.
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142 * @param flags Allows case as well as suffix-insensitive comparisons.
143 * @return Found tag or NULL, changing key or value leads to undefined behavior.
a6d18a0e 144 */
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145attribute_deprecated AVDictionaryEntry *
146av_metadata_get(AVDictionary *m, const char *key, const AVDictionaryEntry *prev, int flags);
a6d18a0e 147
a181981e 148/**
32e6f246 149 * Set the given tag in *pm, overwriting an existing tag.
26cc5310 150 *
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151 * @param pm pointer to a pointer to a metadata struct. If *pm is NULL
152 * a metadata struct is allocated and put in *pm.
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153 * @param key tag key to add to *pm (will be av_strduped depending on flags)
154 * @param value tag value to add to *pm (will be av_strduped depending on flags).
160c896c 155 * Passing a NULL value will cause an existing tag to be deleted.
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156 * @return >= 0 on success otherwise an error code <0
157 */
d9f80ea2 158attribute_deprecated int av_metadata_set2(AVDictionary **pm, const char *key, const char *value, int flags);
a6d18a0e 159
094d9df7 160/**
03700d39 161 * This function is provided for compatibility reason and currently does nothing.
f610a9f2 162 */
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163attribute_deprecated void av_metadata_conv(struct AVFormatContext *ctx, const AVMetadataConv *d_conv,
164 const AVMetadataConv *s_conv);
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165
166/**
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167 * Copy metadata from one AVDictionary struct into another.
168 * @param dst pointer to a pointer to a AVDictionary struct. If *dst is NULL,
7f88a5bf 169 * this function will allocate a struct for you and put it in *dst
d9f80ea2 170 * @param src pointer to source AVDictionary struct
7f88a5bf 171 * @param flags flags to use when setting metadata in *dst
d2d67e42 172 * @note metadata is read using the AV_DICT_IGNORE_SUFFIX flag
7f88a5bf 173 */
d9f80ea2 174attribute_deprecated void av_metadata_copy(AVDictionary **dst, AVDictionary *src, int flags);
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175
176/**
d9f80ea2 177 * Free all the memory allocated for an AVDictionary struct.
094d9df7 178 */
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179attribute_deprecated void av_metadata_free(AVDictionary **m);
180/**
181 * @}
182 */
183#endif
094d9df7 184
a6d18a0e 185
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186/* packet functions */
187
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188
189/**
49bd8e4b 190 * Allocate and read the payload of a packet and initialize its
d1b9adf2 191 * fields with default values.
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192 *
193 * @param pkt packet
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194 * @param size desired payload size
195 * @return >0 (read size) if OK, AVERROR_xxx otherwise
3217cb42 196 */
ae628ec1 197int av_get_packet(AVIOContext *s, AVPacket *pkt, int size);
3217cb42 198
de6d9b64 199
6bfc2683 200/**
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201 * Read data and append it to the current content of the AVPacket.
202 * If pkt->size is 0 this is identical to av_get_packet.
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203 * Note that this uses av_grow_packet and thus involves a realloc
204 * which is inefficient. Thus this function should only be used
205 * when there is no reasonable way to know (an upper bound of)
206 * the final size.
207 *
208 * @param pkt packet
209 * @param size amount of data to read
210 * @return >0 (read size) if OK, AVERROR_xxx otherwise, previous data
211 * will not be lost even if an error occurs.
212 */
ae628ec1 213int av_append_packet(AVIOContext *s, AVPacket *pkt, int size);
6bfc2683 214
de6d9b64 215/*************************************************/
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216/* fractional numbers for exact pts handling */
217
671adb17 218/**
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219 * The exact value of the fractional number is: 'val + num / den'.
220 * num is assumed to be 0 <= num < den.
4c08b2bd 221 */
916c80e9 222typedef struct AVFrac {
115329f1 223 int64_t val, num, den;
52e57500 224} AVFrac;
916c80e9 225
916c80e9 226/*************************************************/
b9a281db 227/* input/output formats */
de6d9b64 228
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229struct AVCodecTag;
230
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231/**
232 * This structure contains the data a format has to probe a file.
233 */
b9a281db 234typedef struct AVProbeData {
5c91a675 235 const char *filename;
e5f58f81 236 unsigned char *buf; /**< Buffer must have AVPROBE_PADDING_SIZE of extra allocated bytes filled with zero. */
237 int buf_size; /**< Size of buf except extra allocated bytes */
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238} AVProbeData;
239
22e77e44 240#define AVPROBE_SCORE_MAX 100 ///< maximum score, half of that is used for file-extension-based detection
87e87886 241#define AVPROBE_PADDING_SIZE 32 ///< extra allocated bytes at the end of the probe buffer
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242
243typedef struct AVFormatParameters {
bffd4dd1 244#if FF_API_FORMAT_PARAMETERS
b2592ea4 245 attribute_deprecated AVRational time_base;
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246 attribute_deprecated int sample_rate;
247 attribute_deprecated int channels;
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248 attribute_deprecated int width;
249 attribute_deprecated int height;
f91ccb1d 250 attribute_deprecated enum PixelFormat pix_fmt;
d20576d0 251 attribute_deprecated int channel; /**< Used to select DV channel. */
fc68a8f7 252 attribute_deprecated const char *standard; /**< deprecated, use demuxer-specific options instead. */
fb37d573 253 attribute_deprecated unsigned int mpeg2ts_raw:1; /**< deprecated, use mpegtsraw demuxer */
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254 /**< deprecated, use mpegtsraw demuxer-specific options instead */
255 attribute_deprecated unsigned int mpeg2ts_compute_pcr:1;
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256 attribute_deprecated unsigned int initial_pause:1; /**< Do not begin to play the stream
257 immediately (RTSP only). */
603b8bc2 258 attribute_deprecated unsigned int prealloced_context:1;
17a5556d 259#endif
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260} AVFormatParameters;
261
22a3212e 262//! Demuxer will use avio_open, no opened file should be provided by the caller.
40d9c544 263#define AVFMT_NOFILE 0x0001
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264#define AVFMT_NEEDNUMBER 0x0002 /**< Needs '%d' in filename. */
265#define AVFMT_SHOW_IDS 0x0008 /**< Show format stream IDs numbers. */
266#define AVFMT_RAWPICTURE 0x0020 /**< Format wants AVPicture structure for
267 raw picture data. */
268#define AVFMT_GLOBALHEADER 0x0040 /**< Format wants global header. */
269#define AVFMT_NOTIMESTAMPS 0x0080 /**< Format does not need / have any timestamps. */
270#define AVFMT_GENERIC_INDEX 0x0100 /**< Use generic index building code. */
58ec7e00 271#define AVFMT_TS_DISCONT 0x0200 /**< Format allows timestamp discontinuities. Note, muxers always require valid (monotone) timestamps */
25918212 272#define AVFMT_VARIABLE_FPS 0x0400 /**< Format allows variable fps. */
ab5a0175 273#define AVFMT_NODIMENSIONS 0x0800 /**< Format does not need width/height */
bb62d5c1 274#define AVFMT_NOSTREAMS 0x1000 /**< Format does not require any streams */
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275#define AVFMT_NOBINSEARCH 0x2000 /**< Format does not allow to fallback to binary search via read_timestamp */
276#define AVFMT_NOGENSEARCH 0x4000 /**< Format does not allow to fallback to generic search */
b631fba9 277#define AVFMT_NO_BYTE_SEEK 0x8000 /**< Format does not allow seeking by bytes */
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278
279typedef struct AVOutputFormat {
de6d9b64 280 const char *name;
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281 /**
282 * Descriptive name for the format, meant to be more human-readable
819174fa 283 * than name. You should use the NULL_IF_CONFIG_SMALL() macro
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284 * to define it.
285 */
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286 const char *long_name;
287 const char *mime_type;
4f57fa8c 288 const char *extensions; /**< comma-separated filename extensions */
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289 /**
290 * size of private data so that it can be allocated in the wrapper
291 */
b9a281db 292 int priv_data_size;
de6d9b64 293 /* output support */
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294 enum CodecID audio_codec; /**< default audio codec */
295 enum CodecID video_codec; /**< default video codec */
de6d9b64 296 int (*write_header)(struct AVFormatContext *);
e928649b 297 int (*write_packet)(struct AVFormatContext *, AVPacket *pkt);
de6d9b64 298 int (*write_trailer)(struct AVFormatContext *);
76c56376 299 /**
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300 * can use flags: AVFMT_NOFILE, AVFMT_NEEDNUMBER, AVFMT_RAWPICTURE,
301 * AVFMT_GLOBALHEADER, AVFMT_NOTIMESTAMPS, AVFMT_VARIABLE_FPS,
302 * AVFMT_NODIMENSIONS, AVFMT_NOSTREAMS
76c56376 303 */
b9a281db 304 int flags;
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305 /**
306 * Currently only used to set pixel format if not YUV420P.
307 */
290c5fa6 308 int (*set_parameters)(struct AVFormatContext *, AVFormatParameters *);
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309 int (*interleave_packet)(struct AVFormatContext *, AVPacket *out,
310 AVPacket *in, int flush);
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311
312 /**
78cb7273 313 * List of supported codec_id-codec_tag pairs, ordered by "better
22e77e44 314 * choice first". The arrays are all terminated by CODEC_ID_NONE.
7caf0cc6 315 */
c1854592 316 const struct AVCodecTag * const *codec_tag;
7caf0cc6 317
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318 enum CodecID subtitle_codec; /**< default subtitle codec */
319
451d566f 320#if FF_API_OLD_METADATA2
719e721a 321 const AVMetadataConv *metadata_conv;
03700d39 322#endif
f610a9f2 323
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324 const AVClass *priv_class; ///< AVClass for the private context
325
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326 /**
327 * Test if the given codec can be stored in this container.
328 *
329 * @return 1 if the codec is supported, 0 if it is not.
330 * A negative number if unknown.
331 */
332 int (*query_codec)(enum CodecID id, int std_compliance);
333
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334 /* private fields */
335 struct AVOutputFormat *next;
336} AVOutputFormat;
de6d9b64 337
b9a281db 338typedef struct AVInputFormat {
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339 /**
340 * A comma separated list of short names for the format. New names
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341 * may be appended with a minor bump.
342 */
b9a281db 343 const char *name;
76c56376 344
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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 */
b9a281db 350 const char *long_name;
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351
352 /**
353 * Size of private data so that it can be allocated in the wrapper.
354 */
b9a281db 355 int priv_data_size;
76c56376 356
65d7d68b 357 /**
22e77e44 358 * Tell if a given file has a chance of being parsed as this format.
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359 * The buffer provided is guaranteed to be AVPROBE_PADDING_SIZE bytes
360 * big so you do not have to check for that unless you need more.
65d7d68b 361 */
b9a281db 362 int (*read_probe)(AVProbeData *);
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363
364 /**
365 * Read the format header and initialize the AVFormatContext
366 * structure. Return 0 if OK. 'ap' if non-NULL contains
367 * additional parameters. Only used in raw format right
368 * now. 'av_new_stream' should be called to create new streams.
369 */
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370 int (*read_header)(struct AVFormatContext *,
371 AVFormatParameters *ap);
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372
373 /**
374 * Read one packet and put it in 'pkt'. pts and flags are also
375 * set. 'av_new_stream' can be called only if the flag
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376 * AVFMTCTX_NOHEADER is used and only in the calling thread (not in a
377 * background thread).
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378 * @return 0 on success, < 0 on error.
379 * When returning an error, pkt must not have been allocated
380 * or must be freed before returning
381 */
de6d9b64 382 int (*read_packet)(struct AVFormatContext *, AVPacket *pkt);
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383
384 /**
385 * Close the stream. The AVFormatContext and AVStreams are not
386 * freed by this function
387 */
de6d9b64 388 int (*read_close)(struct AVFormatContext *);
1de2db8f 389
634e0304 390#if FF_API_READ_SEEK
115329f1 391 /**
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392 * Seek to a given timestamp relative to the frames in
393 * stream component stream_index.
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394 * @param stream_index Must not be -1.
395 * @param flags Selects which direction should be preferred if no exact
396 * match is available.
05ce0f11 397 * @return >= 0 on success (but not necessarily the new offset)
3ba1438d 398 */
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399 attribute_deprecated int (*read_seek)(struct AVFormatContext *,
400 int stream_index, int64_t timestamp, int flags);
1de2db8f 401#endif
8d14a25c 402 /**
4f57fa8c 403 * Gets the next timestamp in stream[stream_index].time_base units.
d9526386 404 * @return the timestamp or AV_NOPTS_VALUE if an error occurred
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405 */
406 int64_t (*read_timestamp)(struct AVFormatContext *s, int stream_index,
407 int64_t *pos, int64_t pos_limit);
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408
409 /**
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410 * Can use flags: AVFMT_NOFILE, AVFMT_NEEDNUMBER, AVFMT_SHOW_IDS,
411 * AVFMT_GENERIC_INDEX, AVFMT_TS_DISCONT, AVFMT_NOBINSEARCH,
b631fba9 412 * AVFMT_NOGENSEARCH, AVFMT_NO_BYTE_SEEK.
76c56376 413 */
de6d9b64 414 int flags;
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415
416 /**
417 * If extensions are defined, then no probe is done. You should
418 * usually not use extension format guessing because it is not
419 * reliable enough
420 */
b9a281db 421 const char *extensions;
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422
423 /**
424 * General purpose read-only value that the format can use.
425 */
b9a281db 426 int value;
fb2758c8 427
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428 /**
429 * Start/resume playing - only meaningful if using a network-based format
430 * (RTSP).
431 */
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432 int (*read_play)(struct AVFormatContext *);
433
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434 /**
435 * Pause playing - only meaningful if using a network-based format
436 * (RTSP).
437 */
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438 int (*read_pause)(struct AVFormatContext *);
439
c1854592 440 const struct AVCodecTag * const *codec_tag;
7caf0cc6 441
1de2db8f 442 /**
49bd8e4b 443 * Seek to timestamp ts.
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444 * Seeking will be done so that the point from which all active streams
445 * can be presented successfully will be closest to ts and within min/max_ts.
446 * Active streams are all streams that have AVStream.discard < AVDISCARD_ALL.
447 */
882fb0a3 448 int (*read_seek2)(struct AVFormatContext *s, int stream_index, int64_t min_ts, int64_t ts, int64_t max_ts, int flags);
1de2db8f 449
451d566f 450#if FF_API_OLD_METADATA2
719e721a 451 const AVMetadataConv *metadata_conv;
03700d39 452#endif
f610a9f2 453
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454 const AVClass *priv_class; ///< AVClass for the private context
455
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456 /* private fields */
457 struct AVInputFormat *next;
458} AVInputFormat;
de6d9b64 459
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460enum AVStreamParseType {
461 AVSTREAM_PARSE_NONE,
462 AVSTREAM_PARSE_FULL, /**< full parsing and repack */
4f57fa8c 463 AVSTREAM_PARSE_HEADERS, /**< Only parse headers, do not repack. */
78cb7273 464 AVSTREAM_PARSE_TIMESTAMPS, /**< full parsing and interpolation of timestamps for frames not starting on a packet boundary */
74a6df59 465 AVSTREAM_PARSE_FULL_ONCE, /**< full parsing and repack of the first frame only, only implemented for H.264 currently */
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466};
467
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468typedef struct AVIndexEntry {
469 int64_t pos;
470 int64_t timestamp;
471#define AVINDEX_KEYFRAME 0x0001
30a43f2d 472 int flags:2;
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473 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).
474 int min_distance; /**< Minimum distance between this and the previous keyframe, used to avoid unneeded searching. */
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475} AVIndexEntry;
476
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477#define AV_DISPOSITION_DEFAULT 0x0001
478#define AV_DISPOSITION_DUB 0x0002
479#define AV_DISPOSITION_ORIGINAL 0x0004
480#define AV_DISPOSITION_COMMENT 0x0008
481#define AV_DISPOSITION_LYRICS 0x0010
482#define AV_DISPOSITION_KARAOKE 0x0020
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483
484/**
485 * Track should be used during playback by default.
486 * Useful for subtitle track that should be displayed
487 * even when user did not explicitly ask for subtitles.
488 */
7a617a86 489#define AV_DISPOSITION_FORCED 0x0040
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490#define AV_DISPOSITION_HEARING_IMPAIRED 0x0080 /**< stream for hearing impaired audiences */
491#define AV_DISPOSITION_VISUAL_IMPAIRED 0x0100 /**< stream for visual impaired audiences */
24a83bd1 492#define AV_DISPOSITION_CLEAN_EFFECTS 0x0200 /**< stream without voice */
90c2295b 493
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494/**
495 * Stream structure.
496 * New fields can be added to the end with minor version bumps.
8bfb108b 497 * Removal, reordering and changes to existing fields require a major
ba66ae94 498 * version bump.
8bfb108b 499 * sizeof(AVStream) must not be used outside libav*.
ba66ae94 500 */
de6d9b64 501typedef struct AVStream {
43d414ba 502 int index; /**< stream index in AVFormatContext */
4f57fa8c 503 int id; /**< format-specific stream ID */
43d414ba 504 AVCodecContext *codec; /**< codec context */
b4b87d48 505 /**
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506 * Real base framerate of the stream.
507 * This is the lowest framerate with which all timestamps can be
864ff8c1 508 * represented accurately (it is the least common multiple of all
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509 * framerates in the stream). Note, this value is just a guess!
510 * For example, if the time base is 1/90000 and all frames have either
4f57fa8c 511 * approximately 3600 or 1800 timer ticks, then r_frame_rate will be 50/1.
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512 */
513 AVRational r_frame_rate;
de6d9b64 514 void *priv_data;
82583548 515
9a174562 516#if FF_API_REORDER_PRIVATE
b9a281db 517 /* internal data used in av_find_stream_info() */
82583548 518 int64_t first_dts;
9a174562 519#endif
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520
521 /**
522 * encoding: pts generation when outputting stream
523 */
a9fd2b19 524 struct AVFrac pts;
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525
526 /**
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527 * This is the fundamental unit of time (in seconds) in terms
528 * of which frame timestamps are represented. For fixed-fps content,
22e77e44 529 * time base should be 1/framerate and timestamp increments should be 1.
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530 * decoding: set by libavformat
531 * encoding: set by libavformat in av_write_header
5b28c8c3 532 */
9ee91c2f 533 AVRational time_base;
9a174562 534#if FF_API_REORDER_PRIVATE
43d414ba 535 int pts_wrap_bits; /**< number of bits in pts (used for wrapping control) */
9a174562 536#endif
3d813e4c 537#if FF_API_STREAM_COPY
a48b7a6b 538 /* ffmpeg.c private use */
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539 attribute_deprecated int stream_copy; /**< If set, just copy stream. */
540#endif
4f57fa8c 541 enum AVDiscard discard; ///< Selects which packets can be discarded at will and do not need to be demuxed.
76c56376 542
5e8d2e33 543#if FF_API_AVSTREAM_QUALITY
b4aea108 544 //FIXME move stuff to a flags field?
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545 /**
546 * Quality, as it has been removed from AVCodecContext and put in AVVideoFrame.
547 * MN: dunno if that is the right place for it
548 */
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549 attribute_deprecated float quality;
550#endif
76c56376 551
6d96a9b9 552 /**
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553 * Decoding: pts of the first frame of the stream, in stream time base.
554 * Only set this if you are absolutely 100% sure that the value you set
555 * it to really is the pts of the first frame.
4854c253 556 * This may be undefined (AV_NOPTS_VALUE).
6d96a9b9 557 */
115329f1 558 int64_t start_time;
76c56376 559
e26381b6 560 /**
8bfb108b 561 * Decoding: duration of the stream, in stream time base.
e26381b6 562 * If a source file does not specify a duration, but does specify
4f57fa8c 563 * a bitrate, this value will be estimated from bitrate and file size.
e26381b6 564 */
ee404803 565 int64_t duration;
fb2758c8 566
9a174562 567#if FF_API_REORDER_PRIVATE
fb2758c8 568 /* av_read_frame() support */
57004ff1 569 enum AVStreamParseType need_parsing;
fb2758c8 570 struct AVCodecParserContext *parser;
6ec87caa 571
fb2758c8 572 int64_t cur_dts;
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573 int last_IP_duration;
574 int64_t last_IP_pts;
fb2758c8 575 /* av_seek_frame() support */
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576 AVIndexEntry *index_entries; /**< Only used if the format does not
577 support seeking natively. */
fb2758c8 578 int nb_index_entries;
191e8ca7 579 unsigned int index_entries_allocated_size;
9a174562 580#endif
115329f1 581
b4b87d48 582 int64_t nb_frames; ///< number of frames in this stream if known or 0
504ee036 583
4f57fa8c 584 int disposition; /**< AV_DISPOSITION_* bit field */
0bef08e5 585
9a174562 586#if FF_API_REORDER_PRIVATE
0bef08e5 587 AVProbeData probe_data;
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588#define MAX_REORDER_DELAY 16
589 int64_t pts_buffer[MAX_REORDER_DELAY+1];
9a174562 590#endif
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591
592 /**
593 * sample aspect ratio (0 if unknown)
594 * - encoding: Set by user.
595 * - decoding: Set by libavformat.
596 */
597 AVRational sample_aspect_ratio;
f526adaf 598
d2d67e42 599 AVDictionary *metadata;
3a41c2f7 600
9a174562 601#if FF_API_REORDER_PRIVATE
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602 /* Intended mostly for av_read_frame() support. Not supposed to be used by */
603 /* external applications; try to use something else if at all possible. */
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604 const uint8_t *cur_ptr;
605 int cur_len;
606 AVPacket cur_pkt;
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607
608 // Timestamp generation support:
609 /**
610 * Timestamp corresponding to the last dts sync point.
611 *
612 * Initialized when AVCodecParserContext.dts_sync_point >= 0 and
613 * a DTS is received from the underlying container. Otherwise set to
614 * AV_NOPTS_VALUE by default.
615 */
616 int64_t reference_dts;
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617
618 /**
619 * Number of packets to buffer for codec probing
620 * NOT PART OF PUBLIC API
621 */
48616887 622#define MAX_PROBE_PACKETS 2500
86cb7e33 623 int probe_packets;
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624
625 /**
e07b882b 626 * last packet in packet_buffer for this stream when muxing.
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627 * used internally, NOT PART OF PUBLIC API, dont read or write from outside of libav*
628 */
e07b882b 629 struct AVPacketList *last_in_packet_buffer;
9a174562 630#endif
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631
632 /**
633 * Average framerate
634 */
635 AVRational avg_frame_rate;
6c6e6ef5 636
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637 /*****************************************************************
638 * All fields below this line are not part of the public API. They
639 * may not be used outside of libavformat and can be changed and
640 * removed at will.
641 * New public fields should be added right above.
642 *****************************************************************
643 */
644
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645 /**
646 * Number of frames that have been demuxed during av_find_stream_info()
647 */
648 int codec_info_nb_frames;
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649
650 /**
651 * Stream informations used internally by av_find_stream_info()
652 */
653#define MAX_STD_TIMEBASES (60*12+5)
654 struct {
655 int64_t last_dts;
656 int64_t duration_gcd;
657 int duration_count;
658 double duration_error[MAX_STD_TIMEBASES];
659 int64_t codec_info_duration;
38a4be3f 660 int nb_decoded_frames;
fd0368e7 661 } *info;
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662#if !FF_API_REORDER_PRIVATE
663 const uint8_t *cur_ptr;
664 int cur_len;
665 AVPacket cur_pkt;
666
667 // Timestamp generation support:
668 /**
669 * Timestamp corresponding to the last dts sync point.
670 *
671 * Initialized when AVCodecParserContext.dts_sync_point >= 0 and
672 * a DTS is received from the underlying container. Otherwise set to
673 * AV_NOPTS_VALUE by default.
674 */
675 int64_t reference_dts;
676 int64_t first_dts;
677 int64_t cur_dts;
678 int last_IP_duration;
679 int64_t last_IP_pts;
680
681 /**
682 * Number of packets to buffer for codec probing
683 */
684#define MAX_PROBE_PACKETS 2500
685 int probe_packets;
686
687 /**
688 * last packet in packet_buffer for this stream when muxing.
689 */
690 struct AVPacketList *last_in_packet_buffer;
691 AVProbeData probe_data;
692#define MAX_REORDER_DELAY 16
693 int64_t pts_buffer[MAX_REORDER_DELAY+1];
694 /* av_read_frame() support */
695 enum AVStreamParseType need_parsing;
696 struct AVCodecParserContext *parser;
697
698 AVIndexEntry *index_entries; /**< Only used if the format does not
699 support seeking natively. */
700 int nb_index_entries;
701 unsigned int index_entries_allocated_size;
702
703 int pts_wrap_bits; /**< number of bits in pts (used for wrapping control) */
704#endif
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705} AVStream;
706
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707#define AV_PROGRAM_RUNNING 1
708
ba66ae94 709/**
ba66ae94 710 * New fields can be added to the end with minor version bumps.
8bfb108b 711 * Removal, reordering and changes to existing fields require a major
ba66ae94 712 * version bump.
8bfb108b 713 * sizeof(AVProgram) must not be used outside libav*.
ba66ae94 714 */
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715typedef struct AVProgram {
716 int id;
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717 int flags;
718 enum AVDiscard discard; ///< selects which program to discard and which to feed to the caller
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719 unsigned int *stream_index;
720 unsigned int nb_stream_indexes;
d2d67e42 721 AVDictionary *metadata;
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722} AVProgram;
723
43d414ba 724#define AVFMTCTX_NOHEADER 0x0001 /**< signal that no header is present
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725 (streams are added dynamically) */
726
79d7836a 727typedef struct AVChapter {
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728 int id; ///< unique ID to identify the chapter
729 AVRational time_base; ///< time base in which the start/end timestamps are specified
8931e7b4 730 int64_t start, end; ///< chapter start/end time in time_base units
d2d67e42 731 AVDictionary *metadata;
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732} AVChapter;
733
252f17e2 734/**
4f57fa8c 735 * Format I/O context.
252f17e2 736 * New fields can be added to the end with minor version bumps.
8bfb108b 737 * Removal, reordering and changes to existing fields require a major
252f17e2 738 * version bump.
8bfb108b 739 * sizeof(AVFormatContext) must not be used outside libav*.
252f17e2 740 */
de6d9b64 741typedef struct AVFormatContext {
1447aac4 742 const AVClass *av_class; /**< Set by avformat_alloc_context. */
4f57fa8c 743 /* Can only be iformat or oformat, not both at the same time. */
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744 struct AVInputFormat *iformat;
745 struct AVOutputFormat *oformat;
de6d9b64 746 void *priv_data;
ae628ec1 747 AVIOContext *pb;
db69c2e5 748 unsigned int nb_streams;
38aab35f 749 AVStream **streams;
43d414ba 750 char filename[1024]; /**< input or output filename */
de6d9b64 751 /* stream info */
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752#if FF_API_TIMESTAMP
753 /**
754 * @deprecated use 'creation_time' metadata tag instead
755 */
756 attribute_deprecated int64_t timestamp;
757#endif
6a58e151 758
4f57fa8c 759 int ctx_flags; /**< Format-specific flags, see AVFMTCTX_xx */
df968050 760#if FF_API_REORDER_PRIVATE
4f57fa8c 761 /* private data for pts handling (do not modify directly). */
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762 /**
763 * This buffer is only needed when packets were already buffered but
764 * not decoded, for example to get the codec parameters in MPEG
765 * streams.
766 */
ee404803 767 struct AVPacketList *packet_buffer;
df968050 768#endif
ee404803 769
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770 /**
771 * Decoding: position of the first frame of the component, in
772 * AV_TIME_BASE fractional seconds. NEVER set this value directly:
773 * It is deduced from the AVStream values.
774 */
115329f1 775 int64_t start_time;
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776
777 /**
778 * Decoding: duration of the stream, in AV_TIME_BASE fractional
779 * seconds. Only set this value if you know none of the individual stream
780 * durations and also dont set any of them. This is deduced from the
781 * AVStream values if not set.
782 */
ee404803 783 int64_t duration;
76c56376 784
c10731e7 785#if FF_API_FILESIZE
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786 /**
787 * decoding: total file size, 0 if unknown
788 */
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789 attribute_deprecated int64_t file_size;
790#endif
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791
792 /**
793 * Decoding: total stream bitrate in bit/s, 0 if not
794 * available. Never set it directly if the file_size and the
6001dad6 795 * duration are known as Libav can compute it automatically.
76c56376 796 */
ee404803 797 int bit_rate;
fb2758c8 798
df968050 799#if FF_API_REORDER_PRIVATE
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800 /* av_read_frame() support */
801 AVStream *cur_st;
fb2758c8 802
fb2758c8 803 /* av_seek_frame() support */
ec906fcd 804 int64_t data_offset; /**< offset of the first packet */
df968050 805#endif
115329f1 806
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807#if FF_API_MUXRATE
808 /**
809 * use mpeg muxer private options instead
810 */
811 attribute_deprecated int mux_rate;
812#endif
92400be2 813 unsigned int packet_size;
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814#if FF_API_PRELOAD
815 attribute_deprecated int preload;
816#endif
17c88cb0 817 int max_delay;
8108551a 818
d31e3f7c 819#if FF_API_LOOP_OUTPUT
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820#define AVFMT_NOOUTPUTLOOP -1
821#define AVFMT_INFINITEOUTPUTLOOP 0
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822 /**
823 * number of times to loop output in formats that support it
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824 *
825 * @deprecated use the 'loop' private option in the gif muxer.
76c56376 826 */
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827 attribute_deprecated int loop_output;
828#endif
115329f1 829
30bc6613 830 int flags;
22e77e44 831#define AVFMT_FLAG_GENPTS 0x0001 ///< Generate missing pts even if it requires parsing future frames.
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832#define AVFMT_FLAG_IGNIDX 0x0002 ///< Ignore index.
833#define AVFMT_FLAG_NONBLOCK 0x0004 ///< Do not block when reading packets from input.
c55806e3 834#define AVFMT_FLAG_IGNDTS 0x0008 ///< Ignore DTS on frames that contain both DTS & PTS
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835#define AVFMT_FLAG_NOFILLIN 0x0010 ///< Do not infer any values from other values, just return what is stored in the container
836#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
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837#if FF_API_FLAG_RTP_HINT
838#define AVFMT_FLAG_RTP_HINT 0x0040 ///< Deprecated, use the -movflags rtphint muxer specific AVOption instead
839#endif
05e84c95 840#define AVFMT_FLAG_CUSTOM_IO 0x0080 ///< The caller has supplied a custom AVIOContext, don't avio_close() it.
73e8e8db 841#define AVFMT_FLAG_DISCARD_CORRUPT 0x0100 ///< Discard frames marked corrupted
5894e1bb 842
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843#if FF_API_LOOP_INPUT
844 /**
845 * @deprecated, use the 'loop' img2 demuxer private option.
846 */
847 attribute_deprecated int loop_input;
848#endif
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849
850 /**
851 * decoding: size of data to probe; encoding: unused.
852 */
9e6c9470 853 unsigned int probesize;
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854
855 /**
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856 * Maximum time (in AV_TIME_BASE units) during which the input should
857 * be analyzed in av_find_stream_info().
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858 */
859 int max_analyze_duration;
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860
861 const uint8_t *key;
862 int keylen;
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863
864 unsigned int nb_programs;
865 AVProgram **programs;
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866
867 /**
868 * Forced video codec_id.
4f57fa8c 869 * Demuxing: Set by user.
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870 */
871 enum CodecID video_codec_id;
76c56376 872
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873 /**
874 * Forced audio codec_id.
4f57fa8c 875 * Demuxing: Set by user.
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876 */
877 enum CodecID audio_codec_id;
76c56376 878
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879 /**
880 * Forced subtitle codec_id.
4f57fa8c 881 * Demuxing: Set by user.
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882 */
883 enum CodecID subtitle_codec_id;
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884
885 /**
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886 * Maximum amount of memory in bytes to use for the index of each stream.
887 * If the index exceeds this size, entries will be discarded as
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888 * needed to maintain a smaller size. This can lead to slower or less
889 * accurate seeking (depends on demuxer).
4f57fa8c 890 * Demuxers for which a full in-memory index is mandatory will ignore
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891 * this.
892 * muxing : unused
893 * demuxing: set by user
894 */
895 unsigned int max_index_size;
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896
897 /**
ffa71b2b 898 * Maximum amount of memory in bytes to use for buffering frames
4f57fa8c 899 * obtained from realtime capture devices.
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900 */
901 unsigned int max_picture_buffer;
79d7836a 902
fbabf1e9 903 unsigned int nb_chapters;
79d7836a 904 AVChapter **chapters;
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905
906 /**
4f57fa8c 907 * Flags to enable debugging.
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908 */
909 int debug;
910#define FF_FDEBUG_TS 0x0001
0bef08e5 911
df968050 912#if FF_API_REORDER_PRIVATE
0bef08e5 913 /**
4f57fa8c 914 * Raw packets from the demuxer, prior to parsing and decoding.
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915 * This buffer is used for buffering packets until the codec can
916 * be identified, as parsing cannot be done without knowing the
917 * codec.
918 */
919 struct AVPacketList *raw_packet_buffer;
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920 struct AVPacketList *raw_packet_buffer_end;
921
922 struct AVPacketList *packet_buffer_end;
df968050 923#endif
47146dfb 924
d2d67e42 925 AVDictionary *metadata;
af122d6a 926
df968050 927#if FF_API_REORDER_PRIVATE
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928 /**
929 * Remaining size available for raw_packet_buffer, in bytes.
930 * NOT PART OF PUBLIC API
931 */
48616887 932#define RAW_PACKET_BUFFER_SIZE 2500000
af122d6a 933 int raw_packet_buffer_remaining_size;
df968050 934#endif
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935
936 /**
937 * Start time of the stream in real world time, in microseconds
938 * since the unix epoch (00:00 1st January 1970). That is, pts=0
939 * in the stream was captured at this real world time.
940 * - encoding: Set by user.
941 * - decoding: Unused.
942 */
943 int64_t start_time_realtime;
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944
945 /**
946 * decoding: number of frames used to probe fps
947 */
948 int fps_probe_size;
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949
950 /**
951 * Error recognition; higher values will detect more errors but may
952 * misdetect some more or less valid parts as errors.
953 * - encoding: unused
954 * - decoding: Set by user.
955 */
956 int error_recognition;
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957
958 /*****************************************************************
959 * All fields below this line are not part of the public API. They
960 * may not be used outside of libavformat and can be changed and
961 * removed at will.
962 * New public fields should be added right above.
963 *****************************************************************
964 */
965#if !FF_API_REORDER_PRIVATE
966 /**
967 * Raw packets from the demuxer, prior to parsing and decoding.
968 * This buffer is used for buffering packets until the codec can
969 * be identified, as parsing cannot be done without knowing the
970 * codec.
971 */
972 struct AVPacketList *raw_packet_buffer;
973 struct AVPacketList *raw_packet_buffer_end;
974 /**
975 * Remaining size available for raw_packet_buffer, in bytes.
976 */
977#define RAW_PACKET_BUFFER_SIZE 2500000
978 int raw_packet_buffer_remaining_size;
979
980 /**
981 * This buffer is only needed when packets were already buffered but
982 * not decoded, for example to get the codec parameters in MPEG
983 * streams.
984 */
985 struct AVPacketList *packet_buffer;
986 struct AVPacketList *packet_buffer_end;
987
988 /* av_read_frame() support */
989 AVStream *cur_st;
990
991 /* av_seek_frame() support */
992 int64_t data_offset; /**< offset of the first packet */
993#endif
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994} AVFormatContext;
995
996typedef struct AVPacketList {
997 AVPacket pkt;
998 struct AVPacketList *next;
999} AVPacketList;
1000
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1001/**
1002 * If f is NULL, returns the first registered input format,
22e77e44 1003 * if f is non-NULL, returns the next registered input format after f
aeedac95
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1004 * or NULL if f is the last one.
1005 */
84be6e72 1006AVInputFormat *av_iformat_next(AVInputFormat *f);
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1007
1008/**
1009 * If f is NULL, returns the first registered output format,
22e77e44 1010 * if f is non-NULL, returns the next registered output format after f
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1011 * or NULL if f is the last one.
1012 */
84be6e72 1013AVOutputFormat *av_oformat_next(AVOutputFormat *f);
de6d9b64 1014
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1015#if FF_API_GUESS_IMG2_CODEC
1016attribute_deprecated enum CodecID av_guess_image2_codec(const char *filename);
1017#endif
290c5fa6 1018
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1019/* XXX: Use automatic init with either ELF sections or C file parser */
1020/* modules. */
de6d9b64 1021
b9a281db 1022/* utils.c */
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1023void av_register_input_format(AVInputFormat *format);
1024void av_register_output_format(AVOutputFormat *format);
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1025
1026/**
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1027 * Return the output format in the list of registered output formats
1028 * which best matches the provided parameters, or return NULL if
f48b0fa2
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1029 * there is no match.
1030 *
1031 * @param short_name if non-NULL checks if short_name matches with the
1032 * names of the registered formats
1033 * @param filename if non-NULL checks if filename terminates with the
1034 * extensions of the registered formats
1035 * @param mime_type if non-NULL checks if mime_type matches with the
1036 * MIME type of the registered formats
1037 */
a1f547b9 1038AVOutputFormat *av_guess_format(const char *short_name,
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1039 const char *filename,
1040 const char *mime_type);
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1041
1042/**
49bd8e4b 1043 * Guess the codec ID based upon muxer and filename.
3217cb42 1044 */
115329f1 1045enum CodecID av_guess_codec(AVOutputFormat *fmt, const char *short_name,
78cb7273 1046 const char *filename, const char *mime_type,
72415b2a 1047 enum AVMediaType type);
de6d9b64 1048
3217cb42 1049/**
49bd8e4b 1050 * Send a nice hexadecimal dump of a buffer to the specified file stream.
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1051 *
1052 * @param f The file stream pointer where the dump should be sent to.
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1053 * @param buf buffer
1054 * @param size buffer size
750f0e1f 1055 *
863c4716 1056 * @see av_hex_dump_log, av_pkt_dump2, av_pkt_dump_log2
3217cb42 1057 */
fb2758c8 1058void av_hex_dump(FILE *f, uint8_t *buf, int size);
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1059
1060/**
49bd8e4b 1061 * Send a nice hexadecimal dump of a buffer to the log.
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1062 *
1063 * @param avcl A pointer to an arbitrary struct of which the first field is a
1064 * pointer to an AVClass struct.
1065 * @param level The importance level of the message, lower values signifying
1066 * higher importance.
1067 * @param buf buffer
1068 * @param size buffer size
1069 *
863c4716 1070 * @see av_hex_dump, av_pkt_dump2, av_pkt_dump_log2
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1071 */
1072void av_hex_dump_log(void *avcl, int level, uint8_t *buf, int size);
1073
1074/**
49bd8e4b 1075 * Send a nice dump of a packet to the specified file stream.
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1076 *
1077 * @param f The file stream pointer where the dump should be sent to.
3217cb42 1078 * @param pkt packet to dump
4f57fa8c 1079 * @param dump_payload True if the payload must be displayed, too.
863c4716 1080 * @param st AVStream that the packet belongs to
3217cb42 1081 */
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1082void av_pkt_dump2(FILE *f, AVPacket *pkt, int dump_payload, AVStream *st);
1083
de6d9b64 1084
750f0e1f 1085/**
49bd8e4b 1086 * Send a nice dump of a packet to the log.
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1087 *
1088 * @param avcl A pointer to an arbitrary struct of which the first field is a
1089 * pointer to an AVClass struct.
1090 * @param level The importance level of the message, lower values signifying
1091 * higher importance.
1092 * @param pkt packet to dump
4f57fa8c 1093 * @param dump_payload True if the payload must be displayed, too.
863c4716 1094 * @param st AVStream that the packet belongs to
750f0e1f 1095 */
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1096void av_pkt_dump_log2(void *avcl, int level, AVPacket *pkt, int dump_payload,
1097 AVStream *st);
1098
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1099#if FF_API_PKT_DUMP
1100attribute_deprecated void av_pkt_dump(FILE *f, AVPacket *pkt, int dump_payload);
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1101attribute_deprecated void av_pkt_dump_log(void *avcl, int level, AVPacket *pkt,
1102 int dump_payload);
17ca374c 1103#endif
750f0e1f 1104
4815e246 1105/**
49bd8e4b 1106 * Initialize libavformat and register all the muxers, demuxers and
4815e246
SS
1107 * protocols. If you do not call this function, then you can select
1108 * exactly which formats you want to support.
1109 *
1110 * @see av_register_input_format()
1111 * @see av_register_output_format()
5d377501 1112 * @see av_register_protocol()
4815e246 1113 */
94988531 1114void av_register_all(void);
de6d9b64 1115
7693b93e 1116/**
49bd8e4b 1117 * Get the CodecID for the given codec tag tag.
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SS
1118 * If no codec id is found returns CODEC_ID_NONE.
1119 *
1120 * @param tags list of supported codec_id-codec_tag pairs, as stored
1121 * in AVInputFormat.codec_tag and AVOutputFormat.codec_tag
1122 */
15545a09 1123enum CodecID av_codec_get_id(const struct AVCodecTag * const *tags, unsigned int tag);
7693b93e
SS
1124
1125/**
49bd8e4b 1126 * Get the codec tag for the given codec id id.
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SS
1127 * If no codec tag is found returns 0.
1128 *
1129 * @param tags list of supported codec_id-codec_tag pairs, as stored
1130 * in AVInputFormat.codec_tag and AVOutputFormat.codec_tag
1131 */
15545a09 1132unsigned int av_codec_get_tag(const struct AVCodecTag * const *tags, enum CodecID id);
7caf0cc6 1133
b9a281db 1134/* media file input */
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1135
1136/**
49bd8e4b 1137 * Find AVInputFormat based on the short name of the input format.
3217cb42 1138 */
b9a281db 1139AVInputFormat *av_find_input_format(const char *short_name);
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1140
1141/**
49bd8e4b 1142 * Guess the file format.
3217cb42 1143 *
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1144 * @param is_opened Whether the file is already opened; determines whether
1145 * demuxers with or without AVFMT_NOFILE are probed.
3217cb42 1146 */
94988531 1147AVInputFormat *av_probe_input_format(AVProbeData *pd, int is_opened);
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1148
1149/**
49bd8e4b 1150 * Guess the file format.
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RD
1151 *
1152 * @param is_opened Whether the file is already opened; determines whether
1153 * demuxers with or without AVFMT_NOFILE are probed.
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RD
1154 * @param score_max A probe score larger that this is required to accept a
1155 * detection, the variable is set to the actual detection
1156 * score afterwards.
1157 * If the score is <= AVPROBE_SCORE_MAX / 4 it is recommended
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RD
1158 * to retry with a larger probe buffer.
1159 */
1160AVInputFormat *av_probe_input_format2(AVProbeData *pd, int is_opened, int *score_max);
1161
1162/**
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AH
1163 * Probe a bytestream to determine the input format. Each time a probe returns
1164 * with a score that is too low, the probe buffer size is increased and another
1165 * attempt is made. When the maximum probe size is reached, the input format
1166 * with the highest score is returned.
1167 *
1168 * @param pb the bytestream to probe
1169 * @param fmt the input format is put here
1170 * @param filename the filename of the stream
1171 * @param logctx the log context
1172 * @param offset the offset within the bytestream to probe from
1173 * @param max_probe_size the maximum probe buffer size (zero for default)
1174 * @return 0 in case of success, a negative value corresponding to an
1175 * AVERROR code otherwise
1176 */
ae628ec1 1177int av_probe_input_buffer(AVIOContext *pb, AVInputFormat **fmt,
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AH
1178 const char *filename, void *logctx,
1179 unsigned int offset, unsigned int max_probe_size);
1180
603b8bc2 1181#if FF_API_FORMAT_PARAMETERS
3940caad 1182/**
49bd8e4b 1183 * Allocate all the structures needed to read an input stream.
3217cb42 1184 * This does not open the needed codecs for decoding the stream[s].
603b8bc2 1185 * @deprecated use avformat_open_input instead.
3217cb42 1186 */
603b8bc2 1187attribute_deprecated int av_open_input_stream(AVFormatContext **ic_ptr,
ae628ec1 1188 AVIOContext *pb, const char *filename,
da24c5e3 1189 AVInputFormat *fmt, AVFormatParameters *ap);
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1190
1191/**
49bd8e4b 1192 * Open a media file as input. The codecs are not opened. Only the file
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1193 * header (if present) is read.
1194 *
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DB
1195 * @param ic_ptr The opened media file handle is put here.
1196 * @param filename filename to open
1197 * @param fmt If non-NULL, force the file format to use.
3217cb42 1198 * @param buf_size optional buffer size (zero if default is OK)
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1199 * @param ap Additional parameters needed when opening the file
1200 * (NULL if default).
4f57fa8c 1201 * @return 0 if OK, AVERROR_xxx otherwise
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1202 *
1203 * @deprecated use avformat_open_input instead.
3217cb42 1204 */
603b8bc2 1205attribute_deprecated int av_open_input_file(AVFormatContext **ic_ptr, const char *filename,
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FB
1206 AVInputFormat *fmt,
1207 int buf_size,
1208 AVFormatParameters *ap);
603b8bc2 1209#endif
88a28965 1210
88808c60 1211/**
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1212 * Open an input stream and read the header. The codecs are not opened.
1213 * The stream must be closed with av_close_input_file().
1214 *
1215 * @param ps Pointer to user-supplied AVFormatContext (allocated by avformat_alloc_context).
1216 * May be a pointer to NULL, in which case an AVFormatContext is allocated by this
1217 * function and written into ps.
1218 * Note that a user-supplied AVFormatContext will be freed on failure.
1219 * @param filename Name of the stream to open.
1220 * @param fmt If non-NULL, this parameter forces a specific input format.
1221 * Otherwise the format is autodetected.
1222 * @param options A dictionary filled with AVFormatContext and demuxer-private options.
1223 * On return this parameter will be destroyed and replaced with a dict containing
1224 * options that were not found. May be NULL.
1225 *
1226 * @return 0 on success, a negative AVERROR on failure.
1227 *
1228 * @note If you want to use custom IO, preallocate the format context and set its pb field.
1229 */
1230int avformat_open_input(AVFormatContext **ps, const char *filename, AVInputFormat *fmt, AVDictionary **options);
1231
1232/**
49bd8e4b 1233 * Allocate an AVFormatContext.
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MS
1234 * avformat_free_context() can be used to free the context and everything
1235 * allocated by the framework within it.
88808c60 1236 */
88a28965 1237AVFormatContext *avformat_alloc_context(void);
b9a281db 1238
a67c061e 1239#if FF_API_FORMAT_PARAMETERS
3217cb42 1240/**
49bd8e4b 1241 * Read packets of a media file to get stream information. This
3217cb42 1242 * is useful for file formats with no headers such as MPEG. This
22e77e44 1243 * function also computes the real framerate in case of MPEG-2 repeat
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1244 * frame mode.
1245 * The logical file position is not changed by this function;
1246 * examined packets may be buffered for later processing.
1247 *
1248 * @param ic media file handle
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DB
1249 * @return >=0 if OK, AVERROR_xxx on error
1250 * @todo Let the user decide somehow what information is needed so that
1251 * we do not waste time getting stuff the user does not need.
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1252 *
1253 * @deprecated use avformat_find_stream_info.
3217cb42 1254 */
3c7fa664 1255attribute_deprecated
b9a281db 1256int av_find_stream_info(AVFormatContext *ic);
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1257#endif
1258
1259/**
1260 * Read packets of a media file to get stream information. This
1261 * is useful for file formats with no headers such as MPEG. This
1262 * function also computes the real framerate in case of MPEG-2 repeat
1263 * frame mode.
1264 * The logical file position is not changed by this function;
1265 * examined packets may be buffered for later processing.
1266 *
1267 * @param ic media file handle
1268 * @param options If non-NULL, an ic.nb_streams long array of pointers to
1269 * dictionaries, where i-th member contains options for
1270 * codec corresponding to i-th stream.
1271 * On return each dictionary will be filled with options that were not found.
1272 * @return >=0 if OK, AVERROR_xxx on error
1273 *
1274 * @note this function isn't guaranteed to open all the codecs, so
1275 * options being non-empty at return is a perfectly normal behavior.
1276 *
1277 * @todo Let the user decide somehow what information is needed so that
1278 * we do not waste time getting stuff the user does not need.
1279 */
1280int avformat_find_stream_info(AVFormatContext *ic, AVDictionary **options);
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1281
1282/**
9128ae08
NG
1283 * Find the "best" stream in the file.
1284 * The best stream is determined according to various heuristics as the most
1285 * likely to be what the user expects.
1286 * If the decoder parameter is non-NULL, av_find_best_stream will find the
1287 * default decoder for the stream's codec; streams for which no decoder can
1288 * be found are ignored.
1289 *
1290 * @param ic media file handle
1291 * @param type stream type: video, audio, subtitles, etc.
1292 * @param wanted_stream_nb user-requested stream number,
1293 * or -1 for automatic selection
1294 * @param related_stream try to find a stream related (eg. in the same
1295 * program) to this one, or -1 if none
1296 * @param decoder_ret if non-NULL, returns the decoder for the
1297 * selected stream
1298 * @param flags flags; none are currently defined
1299 * @return the non-negative stream number in case of success,
1300 * AVERROR_STREAM_NOT_FOUND if no stream with the requested type
1301 * could be found,
1302 * AVERROR_DECODER_NOT_FOUND if streams were found but no decoder
1303 * @note If av_find_best_stream returns successfully and decoder_ret is not
1304 * NULL, then *decoder_ret is guaranteed to be set to a valid AVCodec.
1305 */
1306int av_find_best_stream(AVFormatContext *ic,
1307 enum AVMediaType type,
1308 int wanted_stream_nb,
1309 int related_stream,
1310 AVCodec **decoder_ret,
1311 int flags);
1312
1313/**
49bd8e4b 1314 * Read a transport packet from a media file.
3217cb42 1315 *
864ff8c1 1316 * This function is obsolete and should never be used.
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1317 * Use av_read_frame() instead.
1318 *
1319 * @param s media file handle
1320 * @param pkt is filled
4f57fa8c 1321 * @return 0 if OK, AVERROR_xxx on error
3217cb42 1322 */
de6d9b64 1323int av_read_packet(AVFormatContext *s, AVPacket *pkt);
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1324
1325/**
49bd8e4b 1326 * Return the next frame of a stream.
4faf628f
MN
1327 * This function returns what is stored in the file, and does not validate
1328 * that what is there are valid frames for the decoder. It will split what is
1329 * stored in the file into frames and return one for each call. It will not
1330 * omit invalid data between valid frames so as to give the decoder the maximum
1331 * information possible for decoding.
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1332 *
1333 * The returned packet is valid
1334 * until the next av_read_frame() or until av_close_input_file() and
1335 * must be freed with av_free_packet. For video, the packet contains
1336 * exactly one frame. For audio, it contains an integer number of
1337 * frames if each frame has a known fixed size (e.g. PCM or ADPCM
1338 * data). If the audio frames have a variable size (e.g. MPEG audio),
1339 * then it contains one frame.
1340 *
1341 * pkt->pts, pkt->dts and pkt->duration are always set to correct
22e77e44 1342 * values in AVStream.time_base units (and guessed if the format cannot
4f57fa8c
DB
1343 * provide them). pkt->pts can be AV_NOPTS_VALUE if the video format
1344 * has B-frames, so it is better to rely on pkt->dts if you do not
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1345 * decompress the payload.
1346 *
4f57fa8c 1347 * @return 0 if OK, < 0 on error or end of file
3217cb42 1348 */
fb2758c8 1349int av_read_frame(AVFormatContext *s, AVPacket *pkt);
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1350
1351/**
49bd8e4b 1352 * Seek to the keyframe at timestamp.
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1353 * 'timestamp' in 'stream_index'.
1354 * @param stream_index If stream_index is (-1), a default
1355 * stream is selected, and timestamp is automatically converted
1356 * from AV_TIME_BASE units to the stream specific time_base.
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DB
1357 * @param timestamp Timestamp in AVStream.time_base units
1358 * or, if no stream is specified, in AV_TIME_BASE units.
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1359 * @param flags flags which select direction and seeking mode
1360 * @return >= 0 on success
1361 */
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1362int av_seek_frame(AVFormatContext *s, int stream_index, int64_t timestamp,
1363 int flags);
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1364
1365/**
49bd8e4b 1366 * Seek to timestamp ts.
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MN
1367 * Seeking will be done so that the point from which all active streams
1368 * can be presented successfully will be closest to ts and within min/max_ts.
1369 * Active streams are all streams that have AVStream.discard < AVDISCARD_ALL.
1370 *
22e77e44 1371 * If flags contain AVSEEK_FLAG_BYTE, then all timestamps are in bytes and
d04768fa 1372 * are the file position (this may not be supported by all demuxers).
22e77e44 1373 * If flags contain AVSEEK_FLAG_FRAME, then all timestamps are in frames
d04768fa 1374 * in the stream with stream_index (this may not be supported by all demuxers).
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DB
1375 * Otherwise all timestamps are in units of the stream selected by stream_index
1376 * or if stream_index is -1, in AV_TIME_BASE units.
1377 * If flags contain AVSEEK_FLAG_ANY, then non-keyframes are treated as
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1378 * keyframes (this may not be supported by all demuxers).
1379 *
22e77e44 1380 * @param stream_index index of the stream which is used as time base reference
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1381 * @param min_ts smallest acceptable timestamp
1382 * @param ts target timestamp
1383 * @param max_ts largest acceptable timestamp
1384 * @param flags flags
32e543f8 1385 * @return >=0 on success, error code otherwise
998b6f7c 1386 *
8a4d7a30 1387 * @note This is part of the new seek API which is still under construction.
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DB
1388 * Thus do not use this yet. It may change at any time, do not expect
1389 * ABI compatibility yet!
d04768fa
MN
1390 */
1391int avformat_seek_file(AVFormatContext *s, int stream_index, int64_t min_ts, int64_t ts, int64_t max_ts, int flags);
1392
1393/**
49bd8e4b 1394 * Start playing a network-based stream (e.g. RTSP stream) at the
4f57fa8c 1395 * current position.
3217cb42 1396 */
fb2758c8 1397int av_read_play(AVFormatContext *s);
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1398
1399/**
49bd8e4b 1400 * Pause a network-based stream (e.g. RTSP stream).
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1401 *
1402 * Use av_read_play() to resume it.
1403 */
fb2758c8 1404int av_read_pause(AVFormatContext *s);
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1405
1406/**
49bd8e4b 1407 * Free a AVFormatContext allocated by av_open_input_stream.
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RD
1408 * @param s context to free
1409 */
1410void av_close_input_stream(AVFormatContext *s);
1411
1412/**
49bd8e4b 1413 * Close a media file (but not its codecs).
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1414 *
1415 * @param s media file handle
1416 */
de6d9b64 1417void av_close_input_file(AVFormatContext *s);
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1418
1419/**
f124b087
MS
1420 * Free an AVFormatContext and all its streams.
1421 * @param s context to free
1422 */
1423void avformat_free_context(AVFormatContext *s);
1424
569129a6 1425#if FF_API_NEW_STREAM
f124b087 1426/**
49bd8e4b 1427 * Add a new stream to a media file.
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1428 *
1429 * Can only be called in the read_header() function. If the flag
1430 * AVFMTCTX_NOHEADER is in the format context, then new streams
1431 * can be added in read_packet too.
1432 *
1433 * @param s media file handle
4f57fa8c 1434 * @param id file-format-dependent stream ID
3217cb42 1435 */
569129a6 1436attribute_deprecated
b9a281db 1437AVStream *av_new_stream(AVFormatContext *s, int id);
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1438#endif
1439
1440/**
1441 * Add a new stream to a media file.
1442 *
1443 * When demuxing, it is called by the demuxer in read_header(). If the
1444 * flag AVFMTCTX_NOHEADER is set in s.ctx_flags, then it may also
1445 * be called in read_packet().
1446 *
1447 * When muxing, should be called by the user before avformat_write_header().
1448 *
1449 * @param c If non-NULL, the AVCodecContext corresponding to the new stream
1450 * will be initialized to use this codec. This is needed for e.g. codec-specific
1451 * defaults to be set, so codec should be provided if it is known.
1452 *
1453 * @return newly created stream or NULL on error.
1454 */
1455AVStream *avformat_new_stream(AVFormatContext *s, AVCodec *c);
1456
15afa396 1457AVProgram *av_new_program(AVFormatContext *s, int id);
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1458
1459/**
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1460 * Set the pts for a given stream. If the new values would be invalid
1461 * (<= 0), it leaves the AVStream unchanged.
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1462 *
1463 * @param s stream
1464 * @param pts_wrap_bits number of bits effectively used by the pts
1465 * (used for wrap control, 33 is the value for MPEG)
1466 * @param pts_num numerator to convert to seconds (MPEG: 1)
1467 * @param pts_den denominator to convert to seconds (MPEG: 90000)
1468 */
9ee91c2f 1469void av_set_pts_info(AVStream *s, int pts_wrap_bits,
dec14949 1470 unsigned int pts_num, unsigned int pts_den);
de6d9b64 1471
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1472#define AVSEEK_FLAG_BACKWARD 1 ///< seek backward
1473#define AVSEEK_FLAG_BYTE 2 ///< seeking based on position in bytes
4f57fa8c 1474#define AVSEEK_FLAG_ANY 4 ///< seek to any frame, even non-keyframes
2bf74f49 1475#define AVSEEK_FLAG_FRAME 8 ///< seeking based on frame number
3ba1438d 1476
b754978a 1477int av_find_default_stream_index(AVFormatContext *s);
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1478
1479/**
49bd8e4b 1480 * Get the index for a specific timestamp.
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DB
1481 * @param flags if AVSEEK_FLAG_BACKWARD then the returned index will correspond
1482 * to the timestamp which is <= the requested one, if backward
1483 * is 0, then it will be >=
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1484 * if AVSEEK_FLAG_ANY seek to any frame, only keyframes otherwise
1485 * @return < 0 if no such timestamp could be found
1486 */
dc56fc38 1487int av_index_search_timestamp(AVStream *st, int64_t timestamp, int flags);
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1488
1489/**
49bd8e4b 1490 * Add an index entry into a sorted list. Update the entry if the list
4f57fa8c 1491 * already contains it.
3217cb42 1492 *
4f57fa8c 1493 * @param timestamp timestamp in the time base of the given stream
3217cb42 1494 */
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1495int av_add_index_entry(AVStream *st, int64_t pos, int64_t timestamp,
1496 int size, int distance, int flags);
3217cb42 1497
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1498#if FF_API_SEEK_PUBLIC
1499attribute_deprecated
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1500int av_seek_frame_binary(AVFormatContext *s, int stream_index,
1501 int64_t target_ts, int flags);
a2faa951 1502attribute_deprecated
22ffac70 1503void av_update_cur_dts(AVFormatContext *s, AVStream *ref_st, int64_t timestamp);
a2faa951 1504attribute_deprecated
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1505int64_t av_gen_search(AVFormatContext *s, int stream_index,
1506 int64_t target_ts, int64_t pos_min,
1507 int64_t pos_max, int64_t pos_limit,
1508 int64_t ts_min, int64_t ts_max,
1509 int flags, int64_t *ts_ret,
1510 int64_t (*read_timestamp)(struct AVFormatContext *, int , int64_t *, int64_t ));
a2faa951 1511#endif
b754978a 1512
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MN
1513/**
1514 * media file output
1515 */
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1516#if FF_API_FORMAT_PARAMETERS
1517/**
1518 * @deprecated pass the options to avformat_write_header directly.
1519 */
1520attribute_deprecated int av_set_parameters(AVFormatContext *s, AVFormatParameters *ap);
1521#endif
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1522
1523/**
f3bfe388
MR
1524 * Split a URL string into components.
1525 *
1526 * The pointers to buffers for storing individual components may be null,
1527 * in order to ignore that component. Buffers for components not found are
1528 * set to empty strings. If the port is not found, it is set to a negative
1529 * value.
1530 *
1531 * @param proto the buffer for the protocol
1532 * @param proto_size the size of the proto buffer
1533 * @param authorization the buffer for the authorization
1534 * @param authorization_size the size of the authorization buffer
1535 * @param hostname the buffer for the host name
1536 * @param hostname_size the size of the hostname buffer
1537 * @param port_ptr a pointer to store the port number in
1538 * @param path the buffer for the path
1539 * @param path_size the size of the path buffer
1540 * @param url the URL to split
1541 */
1542void av_url_split(char *proto, int proto_size,
1543 char *authorization, int authorization_size,
1544 char *hostname, int hostname_size,
1545 int *port_ptr,
1546 char *path, int path_size,
1547 const char *url);
1548
1549/**
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1550 * Allocate the stream private data and write the stream header to
1551 * an output media file.
1552 *
1553 * @param s Media file handle, must be allocated with avformat_alloc_context().
1554 * Its oformat field must be set to the desired output format;
1555 * Its pb field must be set to an already openened AVIOContext.
1556 * @param options An AVDictionary filled with AVFormatContext and muxer-private options.
1557 * On return this parameter will be destroyed and replaced with a dict containing
1558 * options that were not found. May be NULL.
1559 *
1560 * @return 0 on success, negative AVERROR on failure.
1561 *
1562 * @see av_opt_find, av_dict_set, avio_open, av_oformat_next.
1563 */
1564int avformat_write_header(AVFormatContext *s, AVDictionary **options);
1565
1566#if FF_API_FORMAT_PARAMETERS
1567/**
49bd8e4b 1568 * Allocate the stream private data and write the stream header to an
755bfeab 1569 * output media file.
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1570 * @note: this sets stream time-bases, if possible to stream->codec->time_base
1571 * but for some formats it might also be some other time base
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1572 *
1573 * @param s media file handle
4f57fa8c 1574 * @return 0 if OK, AVERROR_xxx on error
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1575 *
1576 * @deprecated use avformat_write_header.
3217cb42 1577 */
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1578attribute_deprecated int av_write_header(AVFormatContext *s);
1579#endif
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1580
1581/**
49bd8e4b 1582 * Write a packet to an output media file.
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1583 *
1584 * The packet shall contain one audio or video frame.
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1585 * The packet must be correctly interleaved according to the container
1586 * specification, if not then av_interleaved_write_frame must be used.
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1587 *
1588 * @param s media file handle
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1589 * @param pkt The packet, which contains the stream_index, buf/buf_size,
1590 dts/pts, ...
4f57fa8c 1591 * @return < 0 on error, = 0 if OK, 1 if end of stream wanted
3217cb42 1592 */
e928649b 1593int av_write_frame(AVFormatContext *s, AVPacket *pkt);
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1594
1595/**
49bd8e4b 1596 * Write a packet to an output media file ensuring correct interleaving.
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1597 *
1598 * The packet must contain one audio or video frame.
22e77e44 1599 * If the packets are already correctly interleaved, the application should
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1600 * call av_write_frame() instead as it is slightly faster. It is also important
1601 * to keep in mind that completely non-interleaved input will need huge amounts
1602 * of memory to interleave with this, so it is preferable to interleave at the
1603 * demuxer level.
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1604 *
1605 * @param s media file handle
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1606 * @param pkt The packet, which contains the stream_index, buf/buf_size,
1607 dts/pts, ...
4f57fa8c 1608 * @return < 0 on error, = 0 if OK, 1 if end of stream wanted
3217cb42 1609 */
3c895fc0 1610int av_interleaved_write_frame(AVFormatContext *s, AVPacket *pkt);
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1611
1612/**
49bd8e4b 1613 * Interleave a packet per dts in an output media file.
3217cb42 1614 *
78cb7273 1615 * Packets with pkt->destruct == av_destruct_packet will be freed inside this
22e77e44 1616 * function, so they cannot be used after it. Note that calling av_free_packet()
78cb7273 1617 * on them is still safe.
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1618 *
1619 * @param s media file handle
1620 * @param out the interleaved packet will be output here
9a58234f 1621 * @param pkt the input packet
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1622 * @param flush 1 if no further packets are available as input and all
1623 * remaining packets should be output
1624 * @return 1 if a packet was output, 0 if no packet could be output,
d9526386 1625 * < 0 if an error occurred
3217cb42 1626 */
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1627int av_interleave_packet_per_dts(AVFormatContext *s, AVPacket *out,
1628 AVPacket *pkt, int flush);
e928649b 1629
3217cb42 1630/**
49bd8e4b 1631 * Write the stream trailer to an output media file and free the
2b75bde6 1632 * file private data.
3217cb42 1633 *
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1634 * May only be called after a successful call to av_write_header.
1635 *
3217cb42 1636 * @param s media file handle
4f57fa8c 1637 * @return 0 if OK, AVERROR_xxx on error
3217cb42 1638 */
b9a281db 1639int av_write_trailer(AVFormatContext *s);
de6d9b64 1640
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1641#if FF_API_DUMP_FORMAT
1642attribute_deprecated void dump_format(AVFormatContext *ic,
1643 int index,
1644 const char *url,
1645 int is_output);
1646#endif
1647
1648void av_dump_format(AVFormatContext *ic,
1649 int index,
1650 const char *url,
1651 int is_output);
3217cb42 1652
f6c7375a 1653#if FF_API_PARSE_DATE
3217cb42 1654/**
49bd8e4b 1655 * Parse datestr and return a corresponding number of microseconds.
f6c7375a 1656 *
f9436161 1657 * @param datestr String representing a date or a duration.
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1658 * See av_parse_time() for the syntax of the provided string.
1659 * @deprecated in favor of av_parse_time()
3217cb42 1660 */
f6c7375a 1661attribute_deprecated
0c1a9eda 1662int64_t parse_date(const char *datestr, int duration);
f6c7375a 1663#endif
de6d9b64 1664
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1665/**
1666 * Get the current time in microseconds.
1667 */
0c1a9eda 1668int64_t av_gettime(void);
94988531 1669
ab0287fc 1670#if FF_API_FIND_INFO_TAG
3217cb42 1671/**
ab0287fc 1672 * @deprecated use av_find_info_tag in libavutil instead.
3217cb42 1673 */
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1674attribute_deprecated int find_info_tag(char *arg, int arg_size, const char *tag1, const char *info);
1675#endif
de6d9b64 1676
3217cb42 1677/**
49bd8e4b 1678 * Return in 'buf' the path with '%d' replaced by a number.
4f57fa8c 1679 *
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1680 * Also handles the '%0nd' format where 'n' is the total number
1681 * of digits and '%%'.
1682 *
1683 * @param buf destination buffer
1684 * @param buf_size destination buffer size
1685 * @param path numbered sequence string
8ea0e802 1686 * @param number frame number
4f57fa8c 1687 * @return 0 if OK, -1 on format error
3217cb42 1688 */
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1689int av_get_frame_filename(char *buf, int buf_size,
1690 const char *path, int number);
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1691
1692/**
49bd8e4b 1693 * Check whether filename actually is a numbered sequence generator.
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1694 *
1695 * @param filename possible numbered sequence string
4f57fa8c 1696 * @return 1 if a valid numbered sequence string, 0 otherwise
3217cb42 1697 */
5c07cf53 1698int av_filename_number_test(const char *filename);
96baaa6a 1699
c5388c07 1700/**
49bd8e4b 1701 * Generate an SDP for an RTP session.
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1702 *
1703 * @param ac array of AVFormatContexts describing the RTP streams. If the
1704 * array is composed by only one context, such context can contain
1705 * multiple AVStreams (one AVStream per RTP stream). Otherwise,
1706 * all the contexts in the array (an AVCodecContext per RTP stream)
4f57fa8c 1707 * must contain only one AVStream.
8767b80f 1708 * @param n_files number of AVCodecContexts contained in ac
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1709 * @param buf buffer where the SDP will be stored (must be allocated by
1710 * the caller)
8767b80f 1711 * @param size the size of the buffer
4f57fa8c 1712 * @return 0 if OK, AVERROR_xxx on error
c5388c07 1713 */
c234d40b 1714int av_sdp_create(AVFormatContext *ac[], int n_files, char *buf, int size);
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1715
1716#if FF_API_SDP_CREATE
1717attribute_deprecated int avf_sdp_create(AVFormatContext *ac[], int n_files, char *buff, int size);
1718#endif
c5388c07 1719
1a70d127 1720/**
49bd8e4b 1721 * Return a positive value if the given filename has one of the given
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1722 * extensions, 0 otherwise.
1723 *
1724 * @param extensions a comma-separated list of filename extensions
1725 */
1726int av_match_ext(const char *filename, const char *extensions);
1727
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1728/**
1729 * Test if the given container can store a codec.
1730 *
1731 * @param std_compliance standards compliance level, one of FF_COMPLIANCE_*
1732 *
1733 * @return 1 if codec with ID codec_id can be stored in ofmt, 0 if it cannot.
1734 * A negative number if this information is not available.
1735 */
1736int avformat_query_codec(AVOutputFormat *ofmt, enum CodecID codec_id, int std_compliance);
1737
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1738/**
1739 * Get the AVClass for AVFormatContext. It can be used in combination with
1740 * AV_OPT_SEARCH_FAKE_OBJ for examining options.
1741 *
1742 * @see av_opt_find().
1743 */
1744const AVClass *avformat_get_class(void);
1745
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1746/**
1747 * Do global initialization of network components. This is optional,
1748 * but recommended, since it avoids the overhead of implicitly
1749 * doing the setup for each session.
1750 *
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1751 * Calling this function will become mandatory if using network
1752 * protocols at some major version bump.
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1753 */
1754int avformat_network_init(void);
1755
1756/**
1757 * Undo the initialization done by avformat_network_init.
1758 */
1759int avformat_network_deinit(void);
1760
98790382 1761#endif /* AVFORMAT_AVFORMAT_H */