avio: make URLProtocol internal.
[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/**
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26 * I return the LIBAVFORMAT_VERSION_INT constant. You got
27 * a fucking problem with that, douchebag?
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28 */
29unsigned avformat_version(void);
30
c1736936 31/**
49bd8e4b 32 * Return the libavformat build-time configuration.
c1736936 33 */
41600690 34const char *avformat_configuration(void);
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35
36/**
49bd8e4b 37 * Return the libavformat license.
c1736936 38 */
41600690 39const char *avformat_license(void);
c1736936 40
f71869a4 41#include <time.h>
67070e4f 42#include <stdio.h> /* FILE */
76a448ed 43#include "libavcodec/avcodec.h"
de6d9b64 44
de6d9b64 45#include "avio.h"
50196a98 46#include "libavformat/version.h"
de6d9b64 47
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48struct AVFormatContext;
49
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50
51/*
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52 * Public Metadata API.
53 * The metadata API allows libavformat to export metadata tags to a client
2912e87a 54 * application using a sequence of key/value pairs. Like all strings in Libav,
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55 * metadata must be stored as UTF-8 encoded Unicode. Note that metadata
56 * exported by demuxers isn't checked to be valid UTF-8 in most cases.
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57 * Important concepts to keep in mind:
58 * 1. Keys are unique; there can never be 2 tags with the same key. This is
59 * also meant semantically, i.e., a demuxer should not knowingly produce
60 * several keys that are literally different but semantically identical.
61 * E.g., key=Author5, key=Author6. In this example, all authors must be
62 * placed in the same tag.
63 * 2. Metadata is flat, not hierarchical; there are no subtags. If you
64 * want to store, e.g., the email address of the child of producer Alice
65 * and actor Bob, that could have key=alice_and_bobs_childs_email_address.
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66 * 3. Several modifiers can be applied to the tag name. This is done by
67 * appending a dash character ('-') and the modifier name in the order
68 * they appear in the list below -- e.g. foo-eng-sort, not foo-sort-eng.
69 * a) language -- a tag whose value is localized for a particular language
70 * is appended with the ISO 639-2/B 3-letter language code.
71 * For example: Author-ger=Michael, Author-eng=Mike
72 * The original/default language is in the unqualified "Author" tag.
73 * A demuxer should set a default if it sets any translated tag.
74 * b) sorting -- a modified version of a tag that should be used for
75 * sorting will have '-sort' appended. E.g. artist="The Beatles",
76 * artist-sort="Beatles, The".
77 *
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78 * 4. Demuxers attempt to export metadata in a generic format, however tags
79 * with no generic equivalents are left as they are stored in the container.
80 * Follows a list of generic tag names:
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81 *
82 * album -- name of the set this work belongs to
83 * album_artist -- main creator of the set/album, if different from artist.
84 * e.g. "Various Artists" for compilation albums.
85 * artist -- main creator of the work
86 * comment -- any additional description of the file.
87 * composer -- who composed the work, if different from artist.
88 * copyright -- name of copyright holder.
29c5c590 89 * creation_time-- date when the file was created, preferably in ISO 8601.
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90 * date -- date when the work was created, preferably in ISO 8601.
91 * disc -- number of a subset, e.g. disc in a multi-disc collection.
92 * encoder -- name/settings of the software/hardware that produced the file.
93 * encoded_by -- person/group who created the file.
94 * filename -- original name of the file.
95 * genre -- <self-evident>.
96 * language -- main language in which the work is performed, preferably
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97 * in ISO 639-2 format. Multiple languages can be specified by
98 * separating them with commas.
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99 * performer -- artist who performed the work, if different from artist.
100 * E.g for "Also sprach Zarathustra", artist would be "Richard
101 * Strauss" and performer "London Philharmonic Orchestra".
102 * publisher -- name of the label/publisher.
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103 * service_name -- name of the service in broadcasting (channel name).
104 * service_provider -- name of the service provider in broadcasting.
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105 * title -- name of the work.
106 * track -- number of this work in the set, can be in form current/total.
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107 */
108
48a81c0f 109#define AV_METADATA_MATCH_CASE 1
a6d18a0e 110#define AV_METADATA_IGNORE_SUFFIX 2
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111#define AV_METADATA_DONT_STRDUP_KEY 4
112#define AV_METADATA_DONT_STRDUP_VAL 8
56a8242f 113#define AV_METADATA_DONT_OVERWRITE 16 ///< Don't overwrite existing tags.
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114
115typedef struct {
116 char *key;
117 char *value;
bc1d2afb 118}AVMetadataTag;
a6d18a0e 119
e232c252 120typedef struct AVMetadata AVMetadata;
03700d39 121#if FF_API_OLD_METADATA
f610a9f2 122typedef struct AVMetadataConv AVMetadataConv;
03700d39 123#endif
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124
125/**
49bd8e4b 126 * Get a metadata element with matching key.
26cc5310 127 *
22e77e44 128 * @param prev Set to the previous matching element to find the next.
66b6c745 129 * If set to NULL the first matching element is returned.
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130 * @param flags Allows case as well as suffix-insensitive comparisons.
131 * @return Found tag or NULL, changing key or value leads to undefined behavior.
a6d18a0e 132 */
bc1d2afb 133AVMetadataTag *
e232c252 134av_metadata_get(AVMetadata *m, const char *key, const AVMetadataTag *prev, int flags);
a6d18a0e 135
54036be1 136#if FF_API_OLD_METADATA
a6d18a0e 137/**
32e6f246 138 * Set the given tag in *pm, overwriting an existing tag.
26cc5310 139 *
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140 * @param pm pointer to a pointer to a metadata struct. If *pm is NULL
141 * a metadata struct is allocated and put in *pm.
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142 * @param key tag key to add to *pm (will be av_strduped)
143 * @param value tag value to add to *pm (will be av_strduped)
22e77e44 144 * @return >= 0 on success otherwise an error code <0
2ef6c124 145 * @deprecated Use av_metadata_set2() instead.
a6d18a0e 146 */
2ef6c124 147attribute_deprecated int av_metadata_set(AVMetadata **pm, const char *key, const char *value);
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148#endif
149
150/**
32e6f246 151 * Set the given tag in *pm, overwriting an existing tag.
26cc5310 152 *
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153 * @param pm pointer to a pointer to a metadata struct. If *pm is NULL
154 * a metadata struct is allocated and put in *pm.
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155 * @param key tag key to add to *pm (will be av_strduped depending on flags)
156 * @param value tag value to add to *pm (will be av_strduped depending on flags).
160c896c 157 * Passing a NULL value will cause an existing tag to be deleted.
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158 * @return >= 0 on success otherwise an error code <0
159 */
160int av_metadata_set2(AVMetadata **pm, const char *key, const char *value, int flags);
a6d18a0e 161
03700d39 162#if FF_API_OLD_METADATA
094d9df7 163/**
03700d39 164 * This function is provided for compatibility reason and currently does nothing.
f610a9f2 165 */
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166attribute_deprecated void av_metadata_conv(struct AVFormatContext *ctx, const AVMetadataConv *d_conv,
167 const AVMetadataConv *s_conv);
168#endif
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169
170/**
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171 * Copy metadata from one AVMetadata struct into another.
172 * @param dst pointer to a pointer to a AVMetadata struct. If *dst is NULL,
173 * this function will allocate a struct for you and put it in *dst
174 * @param src pointer to source AVMetadata struct
175 * @param flags flags to use when setting metadata in *dst
176 * @note metadata is read using the AV_METADATA_IGNORE_SUFFIX flag
177 */
178void av_metadata_copy(AVMetadata **dst, AVMetadata *src, int flags);
179
180/**
49bd8e4b 181 * Free all the memory allocated for an AVMetadata struct.
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182 */
183void av_metadata_free(AVMetadata **m);
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 {
c0df9d75 244 AVRational time_base;
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245 int sample_rate;
246 int channels;
247 int width;
248 int height;
4606ac8d 249 enum PixelFormat pix_fmt;
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250 int channel; /**< Used to select DV channel. */
251 const char *standard; /**< TV standard, NTSC, PAL, SECAM */
252 unsigned int mpeg2ts_raw:1; /**< Force raw MPEG-2 transport stream output, if possible. */
253 unsigned int mpeg2ts_compute_pcr:1; /**< Compute exact PCR for each transport
72e043dd 254 stream packet (only meaningful if
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255 mpeg2ts_raw is TRUE). */
256 unsigned int initial_pause:1; /**< Do not begin to play the stream
257 immediately (RTSP only). */
72e043dd 258 unsigned int prealloced_context:1;
0139fdea 259#if FF_API_PARAMETERS_CODEC_ID
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260 attribute_deprecated enum CodecID video_codec_id;
261 attribute_deprecated enum CodecID audio_codec_id;
71957315 262#endif
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263} AVFormatParameters;
264
22a3212e 265//! Demuxer will use avio_open, no opened file should be provided by the caller.
40d9c544 266#define AVFMT_NOFILE 0x0001
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267#define AVFMT_NEEDNUMBER 0x0002 /**< Needs '%d' in filename. */
268#define AVFMT_SHOW_IDS 0x0008 /**< Show format stream IDs numbers. */
269#define AVFMT_RAWPICTURE 0x0020 /**< Format wants AVPicture structure for
270 raw picture data. */
271#define AVFMT_GLOBALHEADER 0x0040 /**< Format wants global header. */
272#define AVFMT_NOTIMESTAMPS 0x0080 /**< Format does not need / have any timestamps. */
273#define AVFMT_GENERIC_INDEX 0x0100 /**< Use generic index building code. */
58ec7e00 274#define AVFMT_TS_DISCONT 0x0200 /**< Format allows timestamp discontinuities. Note, muxers always require valid (monotone) timestamps */
25918212 275#define AVFMT_VARIABLE_FPS 0x0400 /**< Format allows variable fps. */
ab5a0175 276#define AVFMT_NODIMENSIONS 0x0800 /**< Format does not need width/height */
bb62d5c1 277#define AVFMT_NOSTREAMS 0x1000 /**< Format does not require any streams */
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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
03700d39 320#if FF_API_OLD_METADATA
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 /* private fields */
327 struct AVOutputFormat *next;
328} AVOutputFormat;
de6d9b64 329
b9a281db 330typedef struct AVInputFormat {
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331 /**
332 * A comma separated list of short names for the format. New names
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333 * may be appended with a minor bump.
334 */
b9a281db 335 const char *name;
76c56376 336
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337 /**
338 * Descriptive name for the format, meant to be more human-readable
819174fa 339 * than name. You should use the NULL_IF_CONFIG_SMALL() macro
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340 * to define it.
341 */
b9a281db 342 const char *long_name;
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343
344 /**
345 * Size of private data so that it can be allocated in the wrapper.
346 */
b9a281db 347 int priv_data_size;
76c56376 348
65d7d68b 349 /**
22e77e44 350 * Tell if a given file has a chance of being parsed as this format.
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351 * The buffer provided is guaranteed to be AVPROBE_PADDING_SIZE bytes
352 * big so you do not have to check for that unless you need more.
65d7d68b 353 */
b9a281db 354 int (*read_probe)(AVProbeData *);
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355
356 /**
357 * Read the format header and initialize the AVFormatContext
358 * structure. Return 0 if OK. 'ap' if non-NULL contains
359 * additional parameters. Only used in raw format right
360 * now. 'av_new_stream' should be called to create new streams.
361 */
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362 int (*read_header)(struct AVFormatContext *,
363 AVFormatParameters *ap);
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364
365 /**
366 * Read one packet and put it in 'pkt'. pts and flags are also
367 * set. 'av_new_stream' can be called only if the flag
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368 * AVFMTCTX_NOHEADER is used and only in the calling thread (not in a
369 * background thread).
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370 * @return 0 on success, < 0 on error.
371 * When returning an error, pkt must not have been allocated
372 * or must be freed before returning
373 */
de6d9b64 374 int (*read_packet)(struct AVFormatContext *, AVPacket *pkt);
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375
376 /**
377 * Close the stream. The AVFormatContext and AVStreams are not
378 * freed by this function
379 */
de6d9b64 380 int (*read_close)(struct AVFormatContext *);
1de2db8f 381
634e0304 382#if FF_API_READ_SEEK
115329f1 383 /**
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384 * Seek to a given timestamp relative to the frames in
385 * stream component stream_index.
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386 * @param stream_index Must not be -1.
387 * @param flags Selects which direction should be preferred if no exact
388 * match is available.
05ce0f11 389 * @return >= 0 on success (but not necessarily the new offset)
3ba1438d 390 */
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391 attribute_deprecated int (*read_seek)(struct AVFormatContext *,
392 int stream_index, int64_t timestamp, int flags);
1de2db8f 393#endif
8d14a25c 394 /**
4f57fa8c 395 * Gets the next timestamp in stream[stream_index].time_base units.
d9526386 396 * @return the timestamp or AV_NOPTS_VALUE if an error occurred
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397 */
398 int64_t (*read_timestamp)(struct AVFormatContext *s, int stream_index,
399 int64_t *pos, int64_t pos_limit);
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400
401 /**
402 * Can use flags: AVFMT_NOFILE, AVFMT_NEEDNUMBER.
403 */
de6d9b64 404 int flags;
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405
406 /**
407 * If extensions are defined, then no probe is done. You should
408 * usually not use extension format guessing because it is not
409 * reliable enough
410 */
b9a281db 411 const char *extensions;
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412
413 /**
414 * General purpose read-only value that the format can use.
415 */
b9a281db 416 int value;
fb2758c8 417
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418 /**
419 * Start/resume playing - only meaningful if using a network-based format
420 * (RTSP).
421 */
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422 int (*read_play)(struct AVFormatContext *);
423
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424 /**
425 * Pause playing - only meaningful if using a network-based format
426 * (RTSP).
427 */
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428 int (*read_pause)(struct AVFormatContext *);
429
c1854592 430 const struct AVCodecTag * const *codec_tag;
7caf0cc6 431
1de2db8f 432 /**
49bd8e4b 433 * Seek to timestamp ts.
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434 * Seeking will be done so that the point from which all active streams
435 * can be presented successfully will be closest to ts and within min/max_ts.
436 * Active streams are all streams that have AVStream.discard < AVDISCARD_ALL.
437 */
882fb0a3 438 int (*read_seek2)(struct AVFormatContext *s, int stream_index, int64_t min_ts, int64_t ts, int64_t max_ts, int flags);
1de2db8f 439
03700d39 440#if FF_API_OLD_METADATA
719e721a 441 const AVMetadataConv *metadata_conv;
03700d39 442#endif
f610a9f2 443
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444 /* private fields */
445 struct AVInputFormat *next;
446} AVInputFormat;
de6d9b64 447
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448enum AVStreamParseType {
449 AVSTREAM_PARSE_NONE,
450 AVSTREAM_PARSE_FULL, /**< full parsing and repack */
4f57fa8c 451 AVSTREAM_PARSE_HEADERS, /**< Only parse headers, do not repack. */
78cb7273 452 AVSTREAM_PARSE_TIMESTAMPS, /**< full parsing and interpolation of timestamps for frames not starting on a packet boundary */
74a6df59 453 AVSTREAM_PARSE_FULL_ONCE, /**< full parsing and repack of the first frame only, only implemented for H.264 currently */
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454};
455
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456typedef struct AVIndexEntry {
457 int64_t pos;
458 int64_t timestamp;
459#define AVINDEX_KEYFRAME 0x0001
30a43f2d 460 int flags:2;
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461 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).
462 int min_distance; /**< Minimum distance between this and the previous keyframe, used to avoid unneeded searching. */
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463} AVIndexEntry;
464
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465#define AV_DISPOSITION_DEFAULT 0x0001
466#define AV_DISPOSITION_DUB 0x0002
467#define AV_DISPOSITION_ORIGINAL 0x0004
468#define AV_DISPOSITION_COMMENT 0x0008
469#define AV_DISPOSITION_LYRICS 0x0010
470#define AV_DISPOSITION_KARAOKE 0x0020
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471
472/**
473 * Track should be used during playback by default.
474 * Useful for subtitle track that should be displayed
475 * even when user did not explicitly ask for subtitles.
476 */
7a617a86 477#define AV_DISPOSITION_FORCED 0x0040
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478#define AV_DISPOSITION_HEARING_IMPAIRED 0x0080 /**< stream for hearing impaired audiences */
479#define AV_DISPOSITION_VISUAL_IMPAIRED 0x0100 /**< stream for visual impaired audiences */
24a83bd1 480#define AV_DISPOSITION_CLEAN_EFFECTS 0x0200 /**< stream without voice */
90c2295b 481
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482/**
483 * Stream structure.
484 * New fields can be added to the end with minor version bumps.
8bfb108b 485 * Removal, reordering and changes to existing fields require a major
ba66ae94 486 * version bump.
8bfb108b 487 * sizeof(AVStream) must not be used outside libav*.
ba66ae94 488 */
de6d9b64 489typedef struct AVStream {
43d414ba 490 int index; /**< stream index in AVFormatContext */
4f57fa8c 491 int id; /**< format-specific stream ID */
43d414ba 492 AVCodecContext *codec; /**< codec context */
b4b87d48 493 /**
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494 * Real base framerate of the stream.
495 * This is the lowest framerate with which all timestamps can be
864ff8c1 496 * represented accurately (it is the least common multiple of all
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497 * framerates in the stream). Note, this value is just a guess!
498 * For example, if the time base is 1/90000 and all frames have either
4f57fa8c 499 * approximately 3600 or 1800 timer ticks, then r_frame_rate will be 50/1.
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500 */
501 AVRational r_frame_rate;
de6d9b64 502 void *priv_data;
82583548 503
b9a281db 504 /* internal data used in av_find_stream_info() */
82583548 505 int64_t first_dts;
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506
507 /**
508 * encoding: pts generation when outputting stream
509 */
a9fd2b19 510 struct AVFrac pts;
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511
512 /**
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513 * This is the fundamental unit of time (in seconds) in terms
514 * of which frame timestamps are represented. For fixed-fps content,
22e77e44 515 * time base should be 1/framerate and timestamp increments should be 1.
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516 * decoding: set by libavformat
517 * encoding: set by libavformat in av_write_header
5b28c8c3 518 */
9ee91c2f 519 AVRational time_base;
43d414ba 520 int pts_wrap_bits; /**< number of bits in pts (used for wrapping control) */
a48b7a6b 521 /* ffmpeg.c private use */
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522 int stream_copy; /**< If set, just copy stream. */
523 enum AVDiscard discard; ///< Selects which packets can be discarded at will and do not need to be demuxed.
76c56376 524
b4aea108 525 //FIXME move stuff to a flags field?
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526 /**
527 * Quality, as it has been removed from AVCodecContext and put in AVVideoFrame.
528 * MN: dunno if that is the right place for it
529 */
115329f1 530 float quality;
76c56376 531
6d96a9b9 532 /**
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533 * Decoding: pts of the first frame of the stream, in stream time base.
534 * Only set this if you are absolutely 100% sure that the value you set
535 * it to really is the pts of the first frame.
4854c253 536 * This may be undefined (AV_NOPTS_VALUE).
6d96a9b9 537 */
115329f1 538 int64_t start_time;
76c56376 539
e26381b6 540 /**
8bfb108b 541 * Decoding: duration of the stream, in stream time base.
e26381b6 542 * If a source file does not specify a duration, but does specify
4f57fa8c 543 * a bitrate, this value will be estimated from bitrate and file size.
e26381b6 544 */
ee404803 545 int64_t duration;
fb2758c8 546
54036be1 547#if FF_API_OLD_METADATA
a15c7fd6 548 attribute_deprecated char language[4]; /**< ISO 639-2/B 3-letter language code (empty string if undefined) */
827f7e28 549#endif
09730260 550
fb2758c8 551 /* av_read_frame() support */
57004ff1 552 enum AVStreamParseType need_parsing;
fb2758c8 553 struct AVCodecParserContext *parser;
6ec87caa 554
fb2758c8 555 int64_t cur_dts;
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556 int last_IP_duration;
557 int64_t last_IP_pts;
fb2758c8 558 /* av_seek_frame() support */
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559 AVIndexEntry *index_entries; /**< Only used if the format does not
560 support seeking natively. */
fb2758c8 561 int nb_index_entries;
191e8ca7 562 unsigned int index_entries_allocated_size;
115329f1 563
b4b87d48 564 int64_t nb_frames; ///< number of frames in this stream if known or 0
504ee036 565
d1742ff7 566#if FF_API_LAVF_UNUSED
a15c7fd6 567 attribute_deprecated int64_t unused[4+1];
dd872bf4 568#endif
f8d7c9d3 569
54036be1 570#if FF_API_OLD_METADATA
a15c7fd6 571 attribute_deprecated char *filename; /**< source filename of the stream */
827f7e28 572#endif
90c2295b 573
4f57fa8c 574 int disposition; /**< AV_DISPOSITION_* bit field */
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575
576 AVProbeData probe_data;
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577#define MAX_REORDER_DELAY 16
578 int64_t pts_buffer[MAX_REORDER_DELAY+1];
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579
580 /**
581 * sample aspect ratio (0 if unknown)
582 * - encoding: Set by user.
583 * - decoding: Set by libavformat.
584 */
585 AVRational sample_aspect_ratio;
f526adaf 586
e232c252 587 AVMetadata *metadata;
3a41c2f7 588
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589 /* Intended mostly for av_read_frame() support. Not supposed to be used by */
590 /* external applications; try to use something else if at all possible. */
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591 const uint8_t *cur_ptr;
592 int cur_len;
593 AVPacket cur_pkt;
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594
595 // Timestamp generation support:
596 /**
597 * Timestamp corresponding to the last dts sync point.
598 *
599 * Initialized when AVCodecParserContext.dts_sync_point >= 0 and
600 * a DTS is received from the underlying container. Otherwise set to
601 * AV_NOPTS_VALUE by default.
602 */
603 int64_t reference_dts;
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604
605 /**
606 * Number of packets to buffer for codec probing
607 * NOT PART OF PUBLIC API
608 */
48616887 609#define MAX_PROBE_PACKETS 2500
86cb7e33 610 int probe_packets;
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611
612 /**
e07b882b 613 * last packet in packet_buffer for this stream when muxing.
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614 * used internally, NOT PART OF PUBLIC API, dont read or write from outside of libav*
615 */
e07b882b 616 struct AVPacketList *last_in_packet_buffer;
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617
618 /**
619 * Average framerate
620 */
621 AVRational avg_frame_rate;
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622
623 /**
624 * Number of frames that have been demuxed during av_find_stream_info()
625 */
626 int codec_info_nb_frames;
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627
628 /**
629 * Stream informations used internally by av_find_stream_info()
630 */
631#define MAX_STD_TIMEBASES (60*12+5)
632 struct {
633 int64_t last_dts;
634 int64_t duration_gcd;
635 int duration_count;
636 double duration_error[MAX_STD_TIMEBASES];
637 int64_t codec_info_duration;
638 } *info;
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639} AVStream;
640
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641#define AV_PROGRAM_RUNNING 1
642
ba66ae94 643/**
ba66ae94 644 * New fields can be added to the end with minor version bumps.
8bfb108b 645 * Removal, reordering and changes to existing fields require a major
ba66ae94 646 * version bump.
8bfb108b 647 * sizeof(AVProgram) must not be used outside libav*.
ba66ae94 648 */
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649typedef struct AVProgram {
650 int id;
54036be1 651#if FF_API_OLD_METADATA
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652 attribute_deprecated char *provider_name; ///< network name for DVB streams
653 attribute_deprecated char *name; ///< service name for DVB streams
827f7e28 654#endif
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655 int flags;
656 enum AVDiscard discard; ///< selects which program to discard and which to feed to the caller
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657 unsigned int *stream_index;
658 unsigned int nb_stream_indexes;
e232c252 659 AVMetadata *metadata;
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660} AVProgram;
661
43d414ba 662#define AVFMTCTX_NOHEADER 0x0001 /**< signal that no header is present
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663 (streams are added dynamically) */
664
79d7836a 665typedef struct AVChapter {
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666 int id; ///< unique ID to identify the chapter
667 AVRational time_base; ///< time base in which the start/end timestamps are specified
8931e7b4 668 int64_t start, end; ///< chapter start/end time in time_base units
54036be1 669#if FF_API_OLD_METADATA
a15c7fd6 670 attribute_deprecated char *title; ///< chapter title
827f7e28 671#endif
e232c252 672 AVMetadata *metadata;
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673} AVChapter;
674
54036be1 675#if FF_API_MAX_STREAMS
de6d9b64 676#define MAX_STREAMS 20
ad5cc780 677#endif
de6d9b64 678
252f17e2 679/**
4f57fa8c 680 * Format I/O context.
252f17e2 681 * New fields can be added to the end with minor version bumps.
8bfb108b 682 * Removal, reordering and changes to existing fields require a major
252f17e2 683 * version bump.
8bfb108b 684 * sizeof(AVFormatContext) must not be used outside libav*.
252f17e2 685 */
de6d9b64 686typedef struct AVFormatContext {
1447aac4 687 const AVClass *av_class; /**< Set by avformat_alloc_context. */
4f57fa8c 688 /* Can only be iformat or oformat, not both at the same time. */
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689 struct AVInputFormat *iformat;
690 struct AVOutputFormat *oformat;
de6d9b64 691 void *priv_data;
ae628ec1 692 AVIOContext *pb;
db69c2e5 693 unsigned int nb_streams;
61138c43 694#if FF_API_MAX_STREAMS
de6d9b64 695 AVStream *streams[MAX_STREAMS];
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696#else
697 AVStream **streams;
698#endif
43d414ba 699 char filename[1024]; /**< input or output filename */
de6d9b64 700 /* stream info */
4568325a 701 int64_t timestamp;
54036be1 702#if FF_API_OLD_METADATA
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703 attribute_deprecated char title[512];
704 attribute_deprecated char author[512];
705 attribute_deprecated char copyright[512];
706 attribute_deprecated char comment[512];
707 attribute_deprecated char album[512];
708 attribute_deprecated int year; /**< ID3 year, 0 if none */
709 attribute_deprecated int track; /**< track number, 0 if none */
710 attribute_deprecated char genre[32]; /**< ID3 genre */
827f7e28 711#endif
6a58e151 712
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713 int ctx_flags; /**< Format-specific flags, see AVFMTCTX_xx */
714 /* private data for pts handling (do not modify directly). */
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715 /**
716 * This buffer is only needed when packets were already buffered but
717 * not decoded, for example to get the codec parameters in MPEG
718 * streams.
719 */
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720 struct AVPacketList *packet_buffer;
721
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722 /**
723 * Decoding: position of the first frame of the component, in
724 * AV_TIME_BASE fractional seconds. NEVER set this value directly:
725 * It is deduced from the AVStream values.
726 */
115329f1 727 int64_t start_time;
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728
729 /**
730 * Decoding: duration of the stream, in AV_TIME_BASE fractional
731 * seconds. Only set this value if you know none of the individual stream
732 * durations and also dont set any of them. This is deduced from the
733 * AVStream values if not set.
734 */
ee404803 735 int64_t duration;
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736
737 /**
738 * decoding: total file size, 0 if unknown
739 */
ee404803 740 int64_t file_size;
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741
742 /**
743 * Decoding: total stream bitrate in bit/s, 0 if not
744 * available. Never set it directly if the file_size and the
745 * duration are known as FFmpeg can compute it automatically.
746 */
ee404803 747 int bit_rate;
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748
749 /* av_read_frame() support */
750 AVStream *cur_st;
d1742ff7 751#if FF_API_LAVF_UNUSED
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752 const uint8_t *cur_ptr_deprecated;
753 int cur_len_deprecated;
754 AVPacket cur_pkt_deprecated;
755#endif
fb2758c8 756
fb2758c8 757 /* av_seek_frame() support */
ec906fcd 758 int64_t data_offset; /**< offset of the first packet */
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759#if FF_API_INDEX_BUILT
760 attribute_deprecated int index_built;
761#endif
115329f1 762
2db3c638 763 int mux_rate;
92400be2 764 unsigned int packet_size;
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765 int preload;
766 int max_delay;
8108551a 767
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768#define AVFMT_NOOUTPUTLOOP -1
769#define AVFMT_INFINITEOUTPUTLOOP 0
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770 /**
771 * number of times to loop output in formats that support it
772 */
8108551a 773 int loop_output;
115329f1 774
30bc6613 775 int flags;
22e77e44 776#define AVFMT_FLAG_GENPTS 0x0001 ///< Generate missing pts even if it requires parsing future frames.
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777#define AVFMT_FLAG_IGNIDX 0x0002 ///< Ignore index.
778#define AVFMT_FLAG_NONBLOCK 0x0004 ///< Do not block when reading packets from input.
c55806e3 779#define AVFMT_FLAG_IGNDTS 0x0008 ///< Ignore DTS on frames that contain both DTS & PTS
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780#define AVFMT_FLAG_NOFILLIN 0x0010 ///< Do not infer any values from other values, just return what is stored in the container
781#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
796ac233 782#define AVFMT_FLAG_RTP_HINT 0x0040 ///< Add RTP hinting to the output file
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783
784 int loop_input;
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785
786 /**
787 * decoding: size of data to probe; encoding: unused.
788 */
9e6c9470 789 unsigned int probesize;
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790
791 /**
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792 * Maximum time (in AV_TIME_BASE units) during which the input should
793 * be analyzed in av_find_stream_info().
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794 */
795 int max_analyze_duration;
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796
797 const uint8_t *key;
798 int keylen;
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799
800 unsigned int nb_programs;
801 AVProgram **programs;
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802
803 /**
804 * Forced video codec_id.
4f57fa8c 805 * Demuxing: Set by user.
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806 */
807 enum CodecID video_codec_id;
76c56376 808
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809 /**
810 * Forced audio codec_id.
4f57fa8c 811 * Demuxing: Set by user.
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812 */
813 enum CodecID audio_codec_id;
76c56376 814
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815 /**
816 * Forced subtitle codec_id.
4f57fa8c 817 * Demuxing: Set by user.
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818 */
819 enum CodecID subtitle_codec_id;
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820
821 /**
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822 * Maximum amount of memory in bytes to use for the index of each stream.
823 * If the index exceeds this size, entries will be discarded as
3dea63bd
PK
824 * needed to maintain a smaller size. This can lead to slower or less
825 * accurate seeking (depends on demuxer).
4f57fa8c 826 * Demuxers for which a full in-memory index is mandatory will ignore
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PK
827 * this.
828 * muxing : unused
829 * demuxing: set by user
830 */
831 unsigned int max_index_size;
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RP
832
833 /**
ffa71b2b 834 * Maximum amount of memory in bytes to use for buffering frames
4f57fa8c 835 * obtained from realtime capture devices.
ab8ab30c
RP
836 */
837 unsigned int max_picture_buffer;
79d7836a 838
fbabf1e9 839 unsigned int nb_chapters;
79d7836a 840 AVChapter **chapters;
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841
842 /**
4f57fa8c 843 * Flags to enable debugging.
45b2b05f
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844 */
845 int debug;
846#define FF_FDEBUG_TS 0x0001
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847
848 /**
4f57fa8c 849 * Raw packets from the demuxer, prior to parsing and decoding.
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850 * This buffer is used for buffering packets until the codec can
851 * be identified, as parsing cannot be done without knowing the
852 * codec.
853 */
854 struct AVPacketList *raw_packet_buffer;
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855 struct AVPacketList *raw_packet_buffer_end;
856
857 struct AVPacketList *packet_buffer_end;
47146dfb 858
e232c252 859 AVMetadata *metadata;
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860
861 /**
862 * Remaining size available for raw_packet_buffer, in bytes.
863 * NOT PART OF PUBLIC API
864 */
48616887 865#define RAW_PACKET_BUFFER_SIZE 2500000
af122d6a 866 int raw_packet_buffer_remaining_size;
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867
868 /**
869 * Start time of the stream in real world time, in microseconds
870 * since the unix epoch (00:00 1st January 1970). That is, pts=0
871 * in the stream was captured at this real world time.
872 * - encoding: Set by user.
873 * - decoding: Unused.
874 */
875 int64_t start_time_realtime;
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876} AVFormatContext;
877
878typedef struct AVPacketList {
879 AVPacket pkt;
880 struct AVPacketList *next;
881} AVPacketList;
882
114c9a59 883#if FF_API_FIRST_FORMAT
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884attribute_deprecated extern AVInputFormat *first_iformat;
885attribute_deprecated extern AVOutputFormat *first_oformat;
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886#endif
887
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888/**
889 * If f is NULL, returns the first registered input format,
22e77e44 890 * if f is non-NULL, returns the next registered input format after f
aeedac95
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891 * or NULL if f is the last one.
892 */
84be6e72 893AVInputFormat *av_iformat_next(AVInputFormat *f);
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894
895/**
896 * If f is NULL, returns the first registered output format,
22e77e44 897 * if f is non-NULL, returns the next registered output format after f
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898 * or NULL if f is the last one.
899 */
84be6e72 900AVOutputFormat *av_oformat_next(AVOutputFormat *f);
de6d9b64 901
5b6d5596 902enum CodecID av_guess_image2_codec(const char *filename);
290c5fa6 903
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DB
904/* XXX: Use automatic init with either ELF sections or C file parser */
905/* modules. */
de6d9b64 906
b9a281db 907/* utils.c */
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908void av_register_input_format(AVInputFormat *format);
909void av_register_output_format(AVOutputFormat *format);
198ac67f 910#if FF_API_GUESS_FORMAT
1642ee43 911attribute_deprecated AVOutputFormat *guess_stream_format(const char *short_name,
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912 const char *filename,
913 const char *mime_type);
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914
915/**
916 * @deprecated Use av_guess_format() instead.
917 */
918attribute_deprecated AVOutputFormat *guess_format(const char *short_name,
919 const char *filename,
920 const char *mime_type);
1642ee43 921#endif
f48b0fa2
SS
922
923/**
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MR
924 * Return the output format in the list of registered output formats
925 * which best matches the provided parameters, or return NULL if
f48b0fa2
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926 * there is no match.
927 *
928 * @param short_name if non-NULL checks if short_name matches with the
929 * names of the registered formats
930 * @param filename if non-NULL checks if filename terminates with the
931 * extensions of the registered formats
932 * @param mime_type if non-NULL checks if mime_type matches with the
933 * MIME type of the registered formats
934 */
a1f547b9 935AVOutputFormat *av_guess_format(const char *short_name,
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936 const char *filename,
937 const char *mime_type);
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938
939/**
49bd8e4b 940 * Guess the codec ID based upon muxer and filename.
3217cb42 941 */
115329f1 942enum CodecID av_guess_codec(AVOutputFormat *fmt, const char *short_name,
78cb7273 943 const char *filename, const char *mime_type,
72415b2a 944 enum AVMediaType type);
de6d9b64 945
3217cb42 946/**
49bd8e4b 947 * Send a nice hexadecimal dump of a buffer to the specified file stream.
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948 *
949 * @param f The file stream pointer where the dump should be sent to.
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950 * @param buf buffer
951 * @param size buffer size
750f0e1f 952 *
863c4716 953 * @see av_hex_dump_log, av_pkt_dump2, av_pkt_dump_log2
3217cb42 954 */
fb2758c8 955void av_hex_dump(FILE *f, uint8_t *buf, int size);
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956
957/**
49bd8e4b 958 * Send a nice hexadecimal dump of a buffer to the log.
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959 *
960 * @param avcl A pointer to an arbitrary struct of which the first field is a
961 * pointer to an AVClass struct.
962 * @param level The importance level of the message, lower values signifying
963 * higher importance.
964 * @param buf buffer
965 * @param size buffer size
966 *
863c4716 967 * @see av_hex_dump, av_pkt_dump2, av_pkt_dump_log2
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968 */
969void av_hex_dump_log(void *avcl, int level, uint8_t *buf, int size);
970
971/**
49bd8e4b 972 * Send a nice dump of a packet to the specified file stream.
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973 *
974 * @param f The file stream pointer where the dump should be sent to.
3217cb42 975 * @param pkt packet to dump
4f57fa8c 976 * @param dump_payload True if the payload must be displayed, too.
863c4716 977 * @param st AVStream that the packet belongs to
3217cb42 978 */
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979void av_pkt_dump2(FILE *f, AVPacket *pkt, int dump_payload, AVStream *st);
980
de6d9b64 981
750f0e1f 982/**
49bd8e4b 983 * Send a nice dump of a packet to the log.
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984 *
985 * @param avcl A pointer to an arbitrary struct of which the first field is a
986 * pointer to an AVClass struct.
987 * @param level The importance level of the message, lower values signifying
988 * higher importance.
989 * @param pkt packet to dump
4f57fa8c 990 * @param dump_payload True if the payload must be displayed, too.
863c4716 991 * @param st AVStream that the packet belongs to
750f0e1f 992 */
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993void av_pkt_dump_log2(void *avcl, int level, AVPacket *pkt, int dump_payload,
994 AVStream *st);
995
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996#if FF_API_PKT_DUMP
997attribute_deprecated void av_pkt_dump(FILE *f, AVPacket *pkt, int dump_payload);
863c4716 998attribute_deprecated void av_pkt_dump_log(void *avcl, int level, AVPacket *pkt,
c5704b2b 999#endif
863c4716 1000 int dump_payload);
750f0e1f 1001
4815e246 1002/**
49bd8e4b 1003 * Initialize libavformat and register all the muxers, demuxers and
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1004 * protocols. If you do not call this function, then you can select
1005 * exactly which formats you want to support.
1006 *
1007 * @see av_register_input_format()
1008 * @see av_register_output_format()
5d377501 1009 * @see av_register_protocol()
4815e246 1010 */
94988531 1011void av_register_all(void);
de6d9b64 1012
7693b93e 1013/**
49bd8e4b 1014 * Get the CodecID for the given codec tag tag.
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1015 * If no codec id is found returns CODEC_ID_NONE.
1016 *
1017 * @param tags list of supported codec_id-codec_tag pairs, as stored
1018 * in AVInputFormat.codec_tag and AVOutputFormat.codec_tag
1019 */
15545a09 1020enum CodecID av_codec_get_id(const struct AVCodecTag * const *tags, unsigned int tag);
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1021
1022/**
49bd8e4b 1023 * Get the codec tag for the given codec id id.
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1024 * If no codec tag is found returns 0.
1025 *
1026 * @param tags list of supported codec_id-codec_tag pairs, as stored
1027 * in AVInputFormat.codec_tag and AVOutputFormat.codec_tag
1028 */
15545a09 1029unsigned int av_codec_get_tag(const struct AVCodecTag * const *tags, enum CodecID id);
7caf0cc6 1030
b9a281db 1031/* media file input */
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1032
1033/**
49bd8e4b 1034 * Find AVInputFormat based on the short name of the input format.
3217cb42 1035 */
b9a281db 1036AVInputFormat *av_find_input_format(const char *short_name);
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1037
1038/**
49bd8e4b 1039 * Guess the file format.
3217cb42 1040 *
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1041 * @param is_opened Whether the file is already opened; determines whether
1042 * demuxers with or without AVFMT_NOFILE are probed.
3217cb42 1043 */
94988531 1044AVInputFormat *av_probe_input_format(AVProbeData *pd, int is_opened);
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1045
1046/**
49bd8e4b 1047 * Guess the file format.
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1048 *
1049 * @param is_opened Whether the file is already opened; determines whether
1050 * demuxers with or without AVFMT_NOFILE are probed.
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1051 * @param score_max A probe score larger that this is required to accept a
1052 * detection, the variable is set to the actual detection
1053 * score afterwards.
1054 * If the score is <= AVPROBE_SCORE_MAX / 4 it is recommended
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1055 * to retry with a larger probe buffer.
1056 */
1057AVInputFormat *av_probe_input_format2(AVProbeData *pd, int is_opened, int *score_max);
1058
1059/**
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AH
1060 * Probe a bytestream to determine the input format. Each time a probe returns
1061 * with a score that is too low, the probe buffer size is increased and another
1062 * attempt is made. When the maximum probe size is reached, the input format
1063 * with the highest score is returned.
1064 *
1065 * @param pb the bytestream to probe
1066 * @param fmt the input format is put here
1067 * @param filename the filename of the stream
1068 * @param logctx the log context
1069 * @param offset the offset within the bytestream to probe from
1070 * @param max_probe_size the maximum probe buffer size (zero for default)
1071 * @return 0 in case of success, a negative value corresponding to an
1072 * AVERROR code otherwise
1073 */
ae628ec1 1074int av_probe_input_buffer(AVIOContext *pb, AVInputFormat **fmt,
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1075 const char *filename, void *logctx,
1076 unsigned int offset, unsigned int max_probe_size);
1077
1078/**
49bd8e4b 1079 * Allocate all the structures needed to read an input stream.
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1080 * This does not open the needed codecs for decoding the stream[s].
1081 */
115329f1 1082int av_open_input_stream(AVFormatContext **ic_ptr,
ae628ec1 1083 AVIOContext *pb, const char *filename,
da24c5e3 1084 AVInputFormat *fmt, AVFormatParameters *ap);
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1085
1086/**
49bd8e4b 1087 * Open a media file as input. The codecs are not opened. Only the file
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1088 * header (if present) is read.
1089 *
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1090 * @param ic_ptr The opened media file handle is put here.
1091 * @param filename filename to open
1092 * @param fmt If non-NULL, force the file format to use.
3217cb42 1093 * @param buf_size optional buffer size (zero if default is OK)
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1094 * @param ap Additional parameters needed when opening the file
1095 * (NULL if default).
4f57fa8c 1096 * @return 0 if OK, AVERROR_xxx otherwise
3217cb42 1097 */
115329f1 1098int av_open_input_file(AVFormatContext **ic_ptr, const char *filename,
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1099 AVInputFormat *fmt,
1100 int buf_size,
1101 AVFormatParameters *ap);
88a28965 1102
ca51d86c 1103#if FF_API_ALLOC_FORMAT_CONTEXT
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SS
1104/**
1105 * @deprecated Use avformat_alloc_context() instead.
1106 */
1107attribute_deprecated AVFormatContext *av_alloc_format_context(void);
1108#endif
1109
88808c60 1110/**
49bd8e4b 1111 * Allocate an AVFormatContext.
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MS
1112 * avformat_free_context() can be used to free the context and everything
1113 * allocated by the framework within it.
88808c60 1114 */
88a28965 1115AVFormatContext *avformat_alloc_context(void);
b9a281db 1116
3217cb42 1117/**
49bd8e4b 1118 * Read packets of a media file to get stream information. This
3217cb42 1119 * is useful for file formats with no headers such as MPEG. This
22e77e44 1120 * function also computes the real framerate in case of MPEG-2 repeat
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1121 * frame mode.
1122 * The logical file position is not changed by this function;
1123 * examined packets may be buffered for later processing.
1124 *
1125 * @param ic media file handle
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1126 * @return >=0 if OK, AVERROR_xxx on error
1127 * @todo Let the user decide somehow what information is needed so that
1128 * we do not waste time getting stuff the user does not need.
3217cb42 1129 */
b9a281db 1130int av_find_stream_info(AVFormatContext *ic);
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1131
1132/**
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1133 * Find the "best" stream in the file.
1134 * The best stream is determined according to various heuristics as the most
1135 * likely to be what the user expects.
1136 * If the decoder parameter is non-NULL, av_find_best_stream will find the
1137 * default decoder for the stream's codec; streams for which no decoder can
1138 * be found are ignored.
1139 *
1140 * @param ic media file handle
1141 * @param type stream type: video, audio, subtitles, etc.
1142 * @param wanted_stream_nb user-requested stream number,
1143 * or -1 for automatic selection
1144 * @param related_stream try to find a stream related (eg. in the same
1145 * program) to this one, or -1 if none
1146 * @param decoder_ret if non-NULL, returns the decoder for the
1147 * selected stream
1148 * @param flags flags; none are currently defined
1149 * @return the non-negative stream number in case of success,
1150 * AVERROR_STREAM_NOT_FOUND if no stream with the requested type
1151 * could be found,
1152 * AVERROR_DECODER_NOT_FOUND if streams were found but no decoder
1153 * @note If av_find_best_stream returns successfully and decoder_ret is not
1154 * NULL, then *decoder_ret is guaranteed to be set to a valid AVCodec.
1155 */
1156int av_find_best_stream(AVFormatContext *ic,
1157 enum AVMediaType type,
1158 int wanted_stream_nb,
1159 int related_stream,
1160 AVCodec **decoder_ret,
1161 int flags);
1162
1163/**
49bd8e4b 1164 * Read a transport packet from a media file.
3217cb42 1165 *
864ff8c1 1166 * This function is obsolete and should never be used.
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1167 * Use av_read_frame() instead.
1168 *
1169 * @param s media file handle
1170 * @param pkt is filled
4f57fa8c 1171 * @return 0 if OK, AVERROR_xxx on error
3217cb42 1172 */
de6d9b64 1173int av_read_packet(AVFormatContext *s, AVPacket *pkt);
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1174
1175/**
49bd8e4b 1176 * Return the next frame of a stream.
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MN
1177 * This function returns what is stored in the file, and does not validate
1178 * that what is there are valid frames for the decoder. It will split what is
1179 * stored in the file into frames and return one for each call. It will not
1180 * omit invalid data between valid frames so as to give the decoder the maximum
1181 * information possible for decoding.
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1182 *
1183 * The returned packet is valid
1184 * until the next av_read_frame() or until av_close_input_file() and
1185 * must be freed with av_free_packet. For video, the packet contains
1186 * exactly one frame. For audio, it contains an integer number of
1187 * frames if each frame has a known fixed size (e.g. PCM or ADPCM
1188 * data). If the audio frames have a variable size (e.g. MPEG audio),
1189 * then it contains one frame.
1190 *
1191 * pkt->pts, pkt->dts and pkt->duration are always set to correct
22e77e44 1192 * values in AVStream.time_base units (and guessed if the format cannot
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DB
1193 * provide them). pkt->pts can be AV_NOPTS_VALUE if the video format
1194 * has B-frames, so it is better to rely on pkt->dts if you do not
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1195 * decompress the payload.
1196 *
4f57fa8c 1197 * @return 0 if OK, < 0 on error or end of file
3217cb42 1198 */
fb2758c8 1199int av_read_frame(AVFormatContext *s, AVPacket *pkt);
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1200
1201/**
49bd8e4b 1202 * Seek to the keyframe at timestamp.
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1203 * 'timestamp' in 'stream_index'.
1204 * @param stream_index If stream_index is (-1), a default
1205 * stream is selected, and timestamp is automatically converted
1206 * from AV_TIME_BASE units to the stream specific time_base.
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1207 * @param timestamp Timestamp in AVStream.time_base units
1208 * or, if no stream is specified, in AV_TIME_BASE units.
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1209 * @param flags flags which select direction and seeking mode
1210 * @return >= 0 on success
1211 */
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1212int av_seek_frame(AVFormatContext *s, int stream_index, int64_t timestamp,
1213 int flags);
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1214
1215/**
49bd8e4b 1216 * Seek to timestamp ts.
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1217 * Seeking will be done so that the point from which all active streams
1218 * can be presented successfully will be closest to ts and within min/max_ts.
1219 * Active streams are all streams that have AVStream.discard < AVDISCARD_ALL.
1220 *
22e77e44 1221 * If flags contain AVSEEK_FLAG_BYTE, then all timestamps are in bytes and
d04768fa 1222 * are the file position (this may not be supported by all demuxers).
22e77e44 1223 * If flags contain AVSEEK_FLAG_FRAME, then all timestamps are in frames
d04768fa 1224 * in the stream with stream_index (this may not be supported by all demuxers).
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DB
1225 * Otherwise all timestamps are in units of the stream selected by stream_index
1226 * or if stream_index is -1, in AV_TIME_BASE units.
1227 * If flags contain AVSEEK_FLAG_ANY, then non-keyframes are treated as
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1228 * keyframes (this may not be supported by all demuxers).
1229 *
22e77e44 1230 * @param stream_index index of the stream which is used as time base reference
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1231 * @param min_ts smallest acceptable timestamp
1232 * @param ts target timestamp
1233 * @param max_ts largest acceptable timestamp
1234 * @param flags flags
32e543f8 1235 * @return >=0 on success, error code otherwise
998b6f7c 1236 *
8a4d7a30 1237 * @note This is part of the new seek API which is still under construction.
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DB
1238 * Thus do not use this yet. It may change at any time, do not expect
1239 * ABI compatibility yet!
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MN
1240 */
1241int avformat_seek_file(AVFormatContext *s, int stream_index, int64_t min_ts, int64_t ts, int64_t max_ts, int flags);
1242
1243/**
49bd8e4b 1244 * Start playing a network-based stream (e.g. RTSP stream) at the
4f57fa8c 1245 * current position.
3217cb42 1246 */
fb2758c8 1247int av_read_play(AVFormatContext *s);
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1248
1249/**
49bd8e4b 1250 * Pause a network-based stream (e.g. RTSP stream).
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1251 *
1252 * Use av_read_play() to resume it.
1253 */
fb2758c8 1254int av_read_pause(AVFormatContext *s);
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1255
1256/**
49bd8e4b 1257 * Free a AVFormatContext allocated by av_open_input_stream.
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RD
1258 * @param s context to free
1259 */
1260void av_close_input_stream(AVFormatContext *s);
1261
1262/**
49bd8e4b 1263 * Close a media file (but not its codecs).
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1264 *
1265 * @param s media file handle
1266 */
de6d9b64 1267void av_close_input_file(AVFormatContext *s);
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1268
1269/**
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MS
1270 * Free an AVFormatContext and all its streams.
1271 * @param s context to free
1272 */
1273void avformat_free_context(AVFormatContext *s);
1274
1275/**
49bd8e4b 1276 * Add a new stream to a media file.
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1277 *
1278 * Can only be called in the read_header() function. If the flag
1279 * AVFMTCTX_NOHEADER is in the format context, then new streams
1280 * can be added in read_packet too.
1281 *
1282 * @param s media file handle
4f57fa8c 1283 * @param id file-format-dependent stream ID
3217cb42 1284 */
b9a281db 1285AVStream *av_new_stream(AVFormatContext *s, int id);
15afa396 1286AVProgram *av_new_program(AVFormatContext *s, int id);
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1287
1288/**
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1289 * Set the pts for a given stream. If the new values would be invalid
1290 * (<= 0), it leaves the AVStream unchanged.
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1291 *
1292 * @param s stream
1293 * @param pts_wrap_bits number of bits effectively used by the pts
1294 * (used for wrap control, 33 is the value for MPEG)
1295 * @param pts_num numerator to convert to seconds (MPEG: 1)
1296 * @param pts_den denominator to convert to seconds (MPEG: 90000)
1297 */
9ee91c2f 1298void av_set_pts_info(AVStream *s, int pts_wrap_bits,
dec14949 1299 unsigned int pts_num, unsigned int pts_den);
de6d9b64 1300
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1301#define AVSEEK_FLAG_BACKWARD 1 ///< seek backward
1302#define AVSEEK_FLAG_BYTE 2 ///< seeking based on position in bytes
4f57fa8c 1303#define AVSEEK_FLAG_ANY 4 ///< seek to any frame, even non-keyframes
2bf74f49 1304#define AVSEEK_FLAG_FRAME 8 ///< seeking based on frame number
3ba1438d 1305
b754978a 1306int av_find_default_stream_index(AVFormatContext *s);
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1307
1308/**
49bd8e4b 1309 * Get the index for a specific timestamp.
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DB
1310 * @param flags if AVSEEK_FLAG_BACKWARD then the returned index will correspond
1311 * to the timestamp which is <= the requested one, if backward
1312 * is 0, then it will be >=
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1313 * if AVSEEK_FLAG_ANY seek to any frame, only keyframes otherwise
1314 * @return < 0 if no such timestamp could be found
1315 */
dc56fc38 1316int av_index_search_timestamp(AVStream *st, int64_t timestamp, int flags);
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1317
1318/**
49bd8e4b 1319 * Add an index entry into a sorted list. Update the entry if the list
4f57fa8c 1320 * already contains it.
3217cb42 1321 *
4f57fa8c 1322 * @param timestamp timestamp in the time base of the given stream
3217cb42 1323 */
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1324int av_add_index_entry(AVStream *st, int64_t pos, int64_t timestamp,
1325 int size, int distance, int flags);
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1326
1327/**
49bd8e4b 1328 * Perform a binary search using av_index_search_timestamp() and
3673f4ab 1329 * AVInputFormat.read_timestamp().
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1330 * This is not supposed to be called directly by a user application,
1331 * but by demuxers.
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1332 * @param target_ts target timestamp in the time base of the given stream
1333 * @param stream_index stream number
1334 */
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1335int av_seek_frame_binary(AVFormatContext *s, int stream_index,
1336 int64_t target_ts, int flags);
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1337
1338/**
49bd8e4b 1339 * Update cur_dts of all streams based on the given timestamp and AVStream.
3217cb42 1340 *
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DB
1341 * Stream ref_st unchanged, others set cur_dts in their native time base.
1342 * Only needed for timestamp wrapping or if (dts not set and pts!=dts).
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1343 * @param timestamp new dts expressed in time_base of param ref_st
1344 * @param ref_st reference stream giving time_base of param timestamp
1345 */
22ffac70 1346void av_update_cur_dts(AVFormatContext *s, AVStream *ref_st, int64_t timestamp);
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1347
1348/**
49bd8e4b 1349 * Perform a binary search using read_timestamp().
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1350 * This is not supposed to be called directly by a user application,
1351 * but by demuxers.
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1352 * @param target_ts target timestamp in the time base of the given stream
1353 * @param stream_index stream number
1354 */
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1355int64_t av_gen_search(AVFormatContext *s, int stream_index,
1356 int64_t target_ts, int64_t pos_min,
1357 int64_t pos_max, int64_t pos_limit,
1358 int64_t ts_min, int64_t ts_max,
1359 int flags, int64_t *ts_ret,
1360 int64_t (*read_timestamp)(struct AVFormatContext *, int , int64_t *, int64_t ));
b754978a 1361
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1362/**
1363 * media file output
1364 */
290c5fa6 1365int av_set_parameters(AVFormatContext *s, AVFormatParameters *ap);
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1366
1367/**
f3bfe388
MR
1368 * Split a URL string into components.
1369 *
1370 * The pointers to buffers for storing individual components may be null,
1371 * in order to ignore that component. Buffers for components not found are
1372 * set to empty strings. If the port is not found, it is set to a negative
1373 * value.
1374 *
1375 * @param proto the buffer for the protocol
1376 * @param proto_size the size of the proto buffer
1377 * @param authorization the buffer for the authorization
1378 * @param authorization_size the size of the authorization buffer
1379 * @param hostname the buffer for the host name
1380 * @param hostname_size the size of the hostname buffer
1381 * @param port_ptr a pointer to store the port number in
1382 * @param path the buffer for the path
1383 * @param path_size the size of the path buffer
1384 * @param url the URL to split
1385 */
1386void av_url_split(char *proto, int proto_size,
1387 char *authorization, int authorization_size,
1388 char *hostname, int hostname_size,
1389 int *port_ptr,
1390 char *path, int path_size,
1391 const char *url);
1392
1393/**
49bd8e4b 1394 * Allocate the stream private data and write the stream header to an
755bfeab 1395 * output media file.
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1396 * @note: this sets stream time-bases, if possible to stream->codec->time_base
1397 * but for some formats it might also be some other time base
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1398 *
1399 * @param s media file handle
4f57fa8c 1400 * @return 0 if OK, AVERROR_xxx on error
3217cb42 1401 */
b9a281db 1402int av_write_header(AVFormatContext *s);
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1403
1404/**
49bd8e4b 1405 * Write a packet to an output media file.
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1406 *
1407 * The packet shall contain one audio or video frame.
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1408 * The packet must be correctly interleaved according to the container
1409 * specification, if not then av_interleaved_write_frame must be used.
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1410 *
1411 * @param s media file handle
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1412 * @param pkt The packet, which contains the stream_index, buf/buf_size,
1413 dts/pts, ...
4f57fa8c 1414 * @return < 0 on error, = 0 if OK, 1 if end of stream wanted
3217cb42 1415 */
e928649b 1416int av_write_frame(AVFormatContext *s, AVPacket *pkt);
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1417
1418/**
49bd8e4b 1419 * Write a packet to an output media file ensuring correct interleaving.
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1420 *
1421 * The packet must contain one audio or video frame.
22e77e44 1422 * If the packets are already correctly interleaved, the application should
90b5b51e
DB
1423 * call av_write_frame() instead as it is slightly faster. It is also important
1424 * to keep in mind that completely non-interleaved input will need huge amounts
1425 * of memory to interleave with this, so it is preferable to interleave at the
1426 * demuxer level.
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1427 *
1428 * @param s media file handle
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1429 * @param pkt The packet, which contains the stream_index, buf/buf_size,
1430 dts/pts, ...
4f57fa8c 1431 * @return < 0 on error, = 0 if OK, 1 if end of stream wanted
3217cb42 1432 */
3c895fc0 1433int av_interleaved_write_frame(AVFormatContext *s, AVPacket *pkt);
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1434
1435/**
49bd8e4b 1436 * Interleave a packet per dts in an output media file.
3217cb42 1437 *
78cb7273 1438 * Packets with pkt->destruct == av_destruct_packet will be freed inside this
22e77e44 1439 * function, so they cannot be used after it. Note that calling av_free_packet()
78cb7273 1440 * on them is still safe.
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1441 *
1442 * @param s media file handle
1443 * @param out the interleaved packet will be output here
9a58234f 1444 * @param pkt the input packet
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1445 * @param flush 1 if no further packets are available as input and all
1446 * remaining packets should be output
1447 * @return 1 if a packet was output, 0 if no packet could be output,
d9526386 1448 * < 0 if an error occurred
3217cb42 1449 */
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1450int av_interleave_packet_per_dts(AVFormatContext *s, AVPacket *out,
1451 AVPacket *pkt, int flush);
e928649b 1452
3217cb42 1453/**
49bd8e4b 1454 * Write the stream trailer to an output media file and free the
2b75bde6 1455 * file private data.
3217cb42 1456 *
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1457 * May only be called after a successful call to av_write_header.
1458 *
3217cb42 1459 * @param s media file handle
4f57fa8c 1460 * @return 0 if OK, AVERROR_xxx on error
3217cb42 1461 */
b9a281db 1462int av_write_trailer(AVFormatContext *s);
de6d9b64 1463
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1464#if FF_API_DUMP_FORMAT
1465attribute_deprecated void dump_format(AVFormatContext *ic,
1466 int index,
1467 const char *url,
1468 int is_output);
1469#endif
1470
1471void av_dump_format(AVFormatContext *ic,
1472 int index,
1473 const char *url,
1474 int is_output);
3217cb42 1475
d87a521c 1476#if FF_API_PARSE_FRAME_PARAM
3217cb42 1477/**
49bd8e4b 1478 * Parse width and height out of string str.
26ef3220 1479 * @deprecated Use av_parse_video_frame_size instead.
3217cb42 1480 */
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1481attribute_deprecated int parse_image_size(int *width_ptr, int *height_ptr,
1482 const char *str);
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1483
1484/**
49bd8e4b 1485 * Convert framerate from a string to a fraction.
26ef3220 1486 * @deprecated Use av_parse_video_frame_rate instead.
3217cb42 1487 */
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1488attribute_deprecated int parse_frame_rate(int *frame_rate, int *frame_rate_base,
1489 const char *arg);
1ca9133f 1490#endif
3217cb42 1491
f6c7375a 1492#if FF_API_PARSE_DATE
3217cb42 1493/**
49bd8e4b 1494 * Parse datestr and return a corresponding number of microseconds.
f6c7375a 1495 *
f9436161 1496 * @param datestr String representing a date or a duration.
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1497 * See av_parse_time() for the syntax of the provided string.
1498 * @deprecated in favor of av_parse_time()
3217cb42 1499 */
f6c7375a 1500attribute_deprecated
0c1a9eda 1501int64_t parse_date(const char *datestr, int duration);
f6c7375a 1502#endif
de6d9b64 1503
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1504/**
1505 * Get the current time in microseconds.
1506 */
0c1a9eda 1507int64_t av_gettime(void);
94988531 1508
4f57fa8c 1509/* ffm-specific for ffserver */
de6d9b64 1510#define FFM_PACKET_SIZE 4096
bc5c918e 1511int64_t ffm_read_write_index(int fd);
6fcce4f9 1512int ffm_write_write_index(int fd, int64_t pos);
bc5c918e 1513void ffm_set_write_index(AVFormatContext *s, int64_t pos, int64_t file_size);
de6d9b64 1514
ab0287fc 1515#if FF_API_FIND_INFO_TAG
3217cb42 1516/**
ab0287fc 1517 * @deprecated use av_find_info_tag in libavutil instead.
3217cb42 1518 */
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1519attribute_deprecated int find_info_tag(char *arg, int arg_size, const char *tag1, const char *info);
1520#endif
de6d9b64 1521
3217cb42 1522/**
49bd8e4b 1523 * Return in 'buf' the path with '%d' replaced by a number.
4f57fa8c 1524 *
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1525 * Also handles the '%0nd' format where 'n' is the total number
1526 * of digits and '%%'.
1527 *
1528 * @param buf destination buffer
1529 * @param buf_size destination buffer size
1530 * @param path numbered sequence string
8ea0e802 1531 * @param number frame number
4f57fa8c 1532 * @return 0 if OK, -1 on format error
3217cb42 1533 */
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1534int av_get_frame_filename(char *buf, int buf_size,
1535 const char *path, int number);
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1536
1537/**
49bd8e4b 1538 * Check whether filename actually is a numbered sequence generator.
3217cb42
PI
1539 *
1540 * @param filename possible numbered sequence string
4f57fa8c 1541 * @return 1 if a valid numbered sequence string, 0 otherwise
3217cb42 1542 */
5c07cf53 1543int av_filename_number_test(const char *filename);
96baaa6a 1544
c5388c07 1545/**
49bd8e4b 1546 * Generate an SDP for an RTP session.
c5388c07
LA
1547 *
1548 * @param ac array of AVFormatContexts describing the RTP streams. If the
1549 * array is composed by only one context, such context can contain
1550 * multiple AVStreams (one AVStream per RTP stream). Otherwise,
1551 * all the contexts in the array (an AVCodecContext per RTP stream)
4f57fa8c 1552 * must contain only one AVStream.
8767b80f
LA
1553 * @param n_files number of AVCodecContexts contained in ac
1554 * @param buff buffer where the SDP will be stored (must be allocated by
4f57fa8c 1555 * the caller)
8767b80f 1556 * @param size the size of the buffer
4f57fa8c 1557 * @return 0 if OK, AVERROR_xxx on error
c5388c07 1558 */
8767b80f 1559int avf_sdp_create(AVFormatContext *ac[], int n_files, char *buff, int size);
c5388c07 1560
1a70d127 1561/**
49bd8e4b 1562 * Return a positive value if the given filename has one of the given
1a70d127
SS
1563 * extensions, 0 otherwise.
1564 *
1565 * @param extensions a comma-separated list of filename extensions
1566 */
1567int av_match_ext(const char *filename, const char *extensions);
1568
98790382 1569#endif /* AVFORMAT_AVFORMAT_H */