#error in case we do not know how to provide alignment.
[libav.git] / libavformat / avformat.h
CommitLineData
04d7f601
DB
1/*
2 * copyright (c) 2001 Fabrice Bellard
3 *
b78e7197
DB
4 * This file is part of FFmpeg.
5 *
6 * FFmpeg is free software; you can redistribute it and/or
04d7f601
DB
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 *
b78e7197 11 * FFmpeg is distributed in the hope that it will be useful,
04d7f601
DB
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
b78e7197 17 * License along with FFmpeg; if not, write to the Free Software
04d7f601
DB
18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19 */
20
5b21bdab
DB
21#ifndef FFMPEG_AVFORMAT_H
22#define FFMPEG_AVFORMAT_H
de6d9b64 23
800c289a 24#define LIBAVFORMAT_VERSION_MAJOR 52
90c2295b 25#define LIBAVFORMAT_VERSION_MINOR 8
800c289a 26#define LIBAVFORMAT_VERSION_MICRO 0
e97ac1e6 27
800c289a
MR
28#define LIBAVFORMAT_VERSION_INT AV_VERSION_INT(LIBAVFORMAT_VERSION_MAJOR, \
29 LIBAVFORMAT_VERSION_MINOR, \
30 LIBAVFORMAT_VERSION_MICRO)
31#define LIBAVFORMAT_VERSION AV_VERSION(LIBAVFORMAT_VERSION_MAJOR, \
32 LIBAVFORMAT_VERSION_MINOR, \
33 LIBAVFORMAT_VERSION_MICRO)
5aa083ee 34#define LIBAVFORMAT_BUILD LIBAVFORMAT_VERSION_INT
8026c3b5 35
5aa083ee 36#define LIBAVFORMAT_IDENT "Lavf" AV_STRINGIFY(LIBAVFORMAT_VERSION)
4b1f4f23 37
f71869a4 38#include <time.h>
67070e4f 39#include <stdio.h> /* FILE */
76a448ed 40#include "libavcodec/avcodec.h"
de6d9b64 41
de6d9b64
FB
42#include "avio.h"
43
44/* packet functions */
45
46typedef struct AVPacket {
2692067a
MN
47 int64_t pts; ///< presentation time stamp in time_base units
48 int64_t dts; ///< decompression time stamp in time_base units
0c1a9eda 49 uint8_t *data;
6fa5a56c
FB
50 int size;
51 int stream_index;
52 int flags;
2692067a 53 int duration; ///< presentation duration in time_base units (0 if not available)
6fa5a56c
FB
54 void (*destruct)(struct AVPacket *);
55 void *priv;
2692067a 56 int64_t pos; ///< byte position in stream, -1 if unknown
115329f1 57} AVPacket;
6fa5a56c
FB
58#define PKT_FLAG_KEY 0x0001
59
63dd1377 60void av_destruct_packet_nofree(AVPacket *pkt);
3217cb42
PI
61
62/**
63 * Default packet destructor.
64 */
90ad92b3 65void av_destruct_packet(AVPacket *pkt);
63dd1377 66
05abfce9
RP
67/**
68 * Initialize optional fields of a packet to default values.
69 *
70 * @param pkt packet
71 */
659596f0 72void av_init_packet(AVPacket *pkt);
de6d9b64 73
3217cb42 74/**
ac3967c1 75 * Allocate the payload of a packet and initialize its fields to default values.
3217cb42
PI
76 *
77 * @param pkt packet
78 * @param size wanted payload size
79 * @return 0 if OK. AVERROR_xxx otherwise.
80 */
de6d9b64 81int av_new_packet(AVPacket *pkt, int size);
3217cb42
PI
82
83/**
ac3967c1 84 * Allocate and read the payload of a packet and initialize its fields to default values.
3217cb42
PI
85 *
86 * @param pkt packet
87 * @param size wanted payload size
88 * @return >0 (read size) if OK. AVERROR_xxx otherwise.
89 */
2692067a 90int av_get_packet(ByteIOContext *s, AVPacket *pkt, int size);
3217cb42 91
43d414ba
PI
92/**
93 * @warning This is a hack - the packet memory allocation stuff is broken. The
94 * packet is allocated if it was not really allocated
95 */
fb2758c8 96int av_dup_packet(AVPacket *pkt);
6fa5a56c
FB
97
98/**
99 * Free a packet
100 *
101 * @param pkt packet to free
102 */
103static inline void av_free_packet(AVPacket *pkt)
104{
342474ab 105 if (pkt && pkt->destruct) {
bb270c08 106 pkt->destruct(pkt);
342474ab 107 }
6fa5a56c 108}
de6d9b64
FB
109
110/*************************************************/
916c80e9
FB
111/* fractional numbers for exact pts handling */
112
671adb17
MC
113/**
114 * the exact value of the fractional number is: 'val + num / den'.
115 * num is assumed to be such as 0 <= num < den
116 * @deprecated Use AVRational instead
117*/
916c80e9 118typedef struct AVFrac {
115329f1 119 int64_t val, num, den;
955ab9a4 120} AVFrac attribute_deprecated;
916c80e9 121
916c80e9 122/*************************************************/
b9a281db 123/* input/output formats */
de6d9b64 124
7caf0cc6
MN
125struct AVCodecTag;
126
de6d9b64 127struct AVFormatContext;
b9a281db 128
43d414ba 129/** this structure contains the data a format has to probe a file */
b9a281db 130typedef struct AVProbeData {
5c91a675 131 const char *filename;
b9a281db
FB
132 unsigned char *buf;
133 int buf_size;
134} AVProbeData;
135
0288a747 136#define AVPROBE_SCORE_MAX 100 ///< max score, half of that is used for file extension based detection
87e87886 137#define AVPROBE_PADDING_SIZE 32 ///< extra allocated bytes at the end of the probe buffer
de6d9b64
FB
138
139typedef struct AVFormatParameters {
c0df9d75 140 AVRational time_base;
de6d9b64
FB
141 int sample_rate;
142 int channels;
143 int width;
144 int height;
4606ac8d 145 enum PixelFormat pix_fmt;
43d414ba 146 int channel; /**< used to select dv channel */
43d414ba
PI
147 const char *standard; /**< tv standard, NTSC, PAL, SECAM */
148 int mpeg2ts_raw:1; /**< force raw MPEG2 transport stream output, if possible */
149 int mpeg2ts_compute_pcr:1; /**< compute exact PCR for each transport
da24c5e3 150 stream packet (only meaningful if
864ff8c1 151 mpeg2ts_raw is TRUE) */
43d414ba 152 int initial_pause:1; /**< do not begin to play the stream
fb2758c8 153 immediately (RTSP only) */
4eb72c6b 154 int prealloced_context:1;
71957315 155#if LIBAVFORMAT_VERSION_INT < (53<<16)
5b6d5596
MN
156 enum CodecID video_codec_id;
157 enum CodecID audio_codec_id;
71957315 158#endif
de6d9b64
FB
159} AVFormatParameters;
160
40d9c544
RD
161//! demuxer will use url_fopen, no opened file should be provided by the caller
162#define AVFMT_NOFILE 0x0001
43d414ba
PI
163#define AVFMT_NEEDNUMBER 0x0002 /**< needs '%d' in filename */
164#define AVFMT_SHOW_IDS 0x0008 /**< show format stream IDs numbers */
165#define AVFMT_RAWPICTURE 0x0020 /**< format wants AVPicture structure for
fb025625 166 raw picture data */
43d414ba 167#define AVFMT_GLOBALHEADER 0x0040 /**< format wants global header */
755bfeab 168#define AVFMT_NOTIMESTAMPS 0x0080 /**< format does not need / have any timestamps */
43d414ba 169#define AVFMT_GENERIC_INDEX 0x0100 /**< use generic index building code */
b9a281db
FB
170
171typedef struct AVOutputFormat {
de6d9b64
FB
172 const char *name;
173 const char *long_name;
174 const char *mime_type;
cf29452b 175 const char *extensions; /**< comma separated filename extensions */
43d414ba 176 /** size of private data so that it can be allocated in the wrapper */
b9a281db 177 int priv_data_size;
de6d9b64 178 /* output support */
43d414ba
PI
179 enum CodecID audio_codec; /**< default audio codec */
180 enum CodecID video_codec; /**< default video codec */
de6d9b64 181 int (*write_header)(struct AVFormatContext *);
e928649b 182 int (*write_packet)(struct AVFormatContext *, AVPacket *pkt);
de6d9b64 183 int (*write_trailer)(struct AVFormatContext *);
43d414ba 184 /** can use flags: AVFMT_NOFILE, AVFMT_NEEDNUMBER, AVFMT_GLOBALHEADER */
b9a281db 185 int flags;
43d414ba 186 /** currently only used to set pixel format if not YUV420P */
290c5fa6 187 int (*set_parameters)(struct AVFormatContext *, AVFormatParameters *);
fe2d6fe2 188 int (*interleave_packet)(struct AVFormatContext *, AVPacket *out, AVPacket *in, int flush);
7caf0cc6
MN
189
190 /**
191 * list of supported codec_id-codec_tag pairs, ordered by "better choice first"
192 * the arrays are all CODEC_ID_NONE terminated
193 */
6c77805f 194 const struct AVCodecTag **codec_tag;
7caf0cc6 195
11bf3847
AJ
196 enum CodecID subtitle_codec; /**< default subtitle codec */
197
b9a281db
FB
198 /* private fields */
199 struct AVOutputFormat *next;
200} AVOutputFormat;
de6d9b64 201
b9a281db
FB
202typedef struct AVInputFormat {
203 const char *name;
204 const char *long_name;
43d414ba 205 /** size of private data so that it can be allocated in the wrapper */
b9a281db 206 int priv_data_size;
65d7d68b 207 /**
5d81d641
DB
208 * Tell if a given file has a chance of being parsed by this format.
209 * The buffer provided is guaranteed to be AVPROBE_PADDING_SIZE bytes
210 * big so you do not have to check for that unless you need more.
65d7d68b 211 */
b9a281db 212 int (*read_probe)(AVProbeData *);
43d414ba 213 /** read the format header and initialize the AVFormatContext
de6d9b64 214 structure. Return 0 if OK. 'ap' if non NULL contains
e42dba48 215 additional paramters. Only used in raw format right
b9a281db 216 now. 'av_new_stream' should be called to create new streams. */
de6d9b64
FB
217 int (*read_header)(struct AVFormatContext *,
218 AVFormatParameters *ap);
43d414ba 219 /** read one packet and put it in 'pkt'. pts and flags are also
b9a281db 220 set. 'av_new_stream' can be called only if the flag
da24c5e3 221 AVFMTCTX_NOHEADER is used. */
de6d9b64 222 int (*read_packet)(struct AVFormatContext *, AVPacket *pkt);
43d414ba 223 /** close the stream. The AVFormatContext and AVStreams are not
de6d9b64
FB
224 freed by this function */
225 int (*read_close)(struct AVFormatContext *);
115329f1
DB
226 /**
227 * seek to a given timestamp relative to the frames in
3ba1438d
MN
228 * stream component stream_index
229 * @param stream_index must not be -1
115329f1 230 * @param flags selects which direction should be preferred if no exact
3ba1438d 231 * match is available
05ce0f11 232 * @return >= 0 on success (but not necessarily the new offset)
3ba1438d 233 */
115329f1 234 int (*read_seek)(struct AVFormatContext *,
3ba1438d 235 int stream_index, int64_t timestamp, int flags);
8d14a25c 236 /**
2576a9ec 237 * gets the next timestamp in stream[stream_index].time_base units.
de14759e 238 * @return the timestamp or AV_NOPTS_VALUE if an error occured
8d14a25c
MN
239 */
240 int64_t (*read_timestamp)(struct AVFormatContext *s, int stream_index,
241 int64_t *pos, int64_t pos_limit);
43d414ba 242 /** can use flags: AVFMT_NOFILE, AVFMT_NEEDNUMBER */
de6d9b64 243 int flags;
43d414ba 244 /** if extensions are defined, then no probe is done. You should
b9a281db
FB
245 usually not use extension format guessing because it is not
246 reliable enough */
247 const char *extensions;
43d414ba 248 /** general purpose read only value that the format can use */
b9a281db 249 int value;
fb2758c8 250
43d414ba 251 /** start/resume playing - only meaningful if using a network based format
fb2758c8
FB
252 (RTSP) */
253 int (*read_play)(struct AVFormatContext *);
254
43d414ba 255 /** pause playing - only meaningful if using a network based format
fb2758c8
FB
256 (RTSP) */
257 int (*read_pause)(struct AVFormatContext *);
258
6c77805f 259 const struct AVCodecTag **codec_tag;
7caf0cc6 260
b9a281db
FB
261 /* private fields */
262 struct AVInputFormat *next;
263} AVInputFormat;
de6d9b64 264
57004ff1
AJ
265enum AVStreamParseType {
266 AVSTREAM_PARSE_NONE,
267 AVSTREAM_PARSE_FULL, /**< full parsing and repack */
268 AVSTREAM_PARSE_HEADERS, /**< only parse headers, don't repack */
269 AVSTREAM_PARSE_TIMESTAMPS, /**< full parsing and interpolation of timestamps for frames not starting on packet boundary */
270};
271
fb2758c8
FB
272typedef struct AVIndexEntry {
273 int64_t pos;
274 int64_t timestamp;
275#define AVINDEX_KEYFRAME 0x0001
30a43f2d 276 int flags:2;
90b5b51e 277 int size:30; //Yeah, trying to keep the size of this small to reduce memory requirements (it is 24 vs 32 byte due to possible 8byte align).
43d414ba 278 int min_distance; /**< min distance between this and the previous keyframe, used to avoid unneeded searching */
fb2758c8
FB
279} AVIndexEntry;
280
90c2295b
ES
281#define AV_DISPOSITION_DEFAULT 0x0001
282#define AV_DISPOSITION_DUB 0x0002
283#define AV_DISPOSITION_ORIGINAL 0x0004
284#define AV_DISPOSITION_COMMENT 0x0008
285#define AV_DISPOSITION_LYRICS 0x0010
286#define AV_DISPOSITION_KARAOKE 0x0020
287
ba66ae94
MN
288/**
289 * Stream structure.
290 * New fields can be added to the end with minor version bumps.
8bfb108b 291 * Removal, reordering and changes to existing fields require a major
ba66ae94 292 * version bump.
8bfb108b 293 * sizeof(AVStream) must not be used outside libav*.
ba66ae94 294 */
de6d9b64 295typedef struct AVStream {
43d414ba
PI
296 int index; /**< stream index in AVFormatContext */
297 int id; /**< format specific stream id */
298 AVCodecContext *codec; /**< codec context */
b4b87d48 299 /**
8bfb108b
DB
300 * Real base frame rate of the stream.
301 * This is the lowest frame rate with which all timestamps can be
864ff8c1 302 * represented accurately (it is the least common multiple of all
8bfb108b
DB
303 * frame rates in the stream), Note, this value is just a guess!
304 * For example if the timebase is 1/90000 and all frames have either
305 * approximately 3600 or 1800 timer ticks then r_frame_rate will be 50/1.
b4b87d48
MN
306 */
307 AVRational r_frame_rate;
de6d9b64 308 void *priv_data;
82583548 309
b9a281db 310 /* internal data used in av_find_stream_info() */
82583548 311 int64_t first_dts;
43d414ba 312 /** encoding: PTS generation when outputing stream */
a9fd2b19 313 struct AVFrac pts;
5b28c8c3
MN
314
315 /**
8bfb108b
DB
316 * This is the fundamental unit of time (in seconds) in terms
317 * of which frame timestamps are represented. For fixed-fps content,
318 * timebase should be 1/frame rate and timestamp increments should be
5b28c8c3
MN
319 * identically 1.
320 */
9ee91c2f 321 AVRational time_base;
43d414ba 322 int pts_wrap_bits; /**< number of bits in pts (used for wrapping control) */
a48b7a6b 323 /* ffmpeg.c private use */
15786dc4 324 int stream_copy; /**< if set, just copy stream */
755bfeab 325 enum AVDiscard discard; ///< selects which packets can be discarded at will and do not need to be demuxed
b4aea108 326 //FIXME move stuff to a flags field?
43d414ba 327 /** quality, as it has been removed from AVCodecContext and put in AVVideoFrame
755bfeab 328 * MN: dunno if that is the right place for it */
115329f1 329 float quality;
6d96a9b9 330 /**
8bfb108b
DB
331 * Decoding: pts of the first frame of the stream, in stream time base.
332 * Only set this if you are absolutely 100% sure that the value you set
333 * it to really is the pts of the first frame.
4854c253 334 * This may be undefined (AV_NOPTS_VALUE).
8bfb108b
DB
335 * @note The ASF header does NOT contain a correct start_time the ASF
336 * demuxer must NOT set this.
6d96a9b9 337 */
115329f1 338 int64_t start_time;
e26381b6 339 /**
8bfb108b 340 * Decoding: duration of the stream, in stream time base.
e26381b6
NB
341 * If a source file does not specify a duration, but does specify
342 * a bitrate, this value will be estimates from bit rate and file size.
343 */
ee404803 344 int64_t duration;
fb2758c8 345
43d414ba 346 char language[4]; /** ISO 639 3-letter language code (empty string if undefined) */
09730260 347
fb2758c8 348 /* av_read_frame() support */
57004ff1 349 enum AVStreamParseType need_parsing;
fb2758c8 350 struct AVCodecParserContext *parser;
6ec87caa 351
fb2758c8 352 int64_t cur_dts;
635fbcb1
MN
353 int last_IP_duration;
354 int64_t last_IP_pts;
fb2758c8 355 /* av_seek_frame() support */
43d414ba 356 AVIndexEntry *index_entries; /**< only used if the format does not
fb2758c8
FB
357 support seeking natively */
358 int nb_index_entries;
191e8ca7 359 unsigned int index_entries_allocated_size;
115329f1 360
b4b87d48 361 int64_t nb_frames; ///< number of frames in this stream if known or 0
504ee036
MN
362
363#define MAX_REORDER_DELAY 4
364 int64_t pts_buffer[MAX_REORDER_DELAY+1];
f8d7c9d3
ES
365
366 char *filename; /**< source filename of the stream */
90c2295b
ES
367
368 int disposition; /**< AV_DISPOSITION_* bitfield */
de6d9b64
FB
369} AVStream;
370
15afa396
NS
371#define AV_PROGRAM_RUNNING 1
372
ba66ae94 373/**
ba66ae94 374 * New fields can be added to the end with minor version bumps.
8bfb108b 375 * Removal, reordering and changes to existing fields require a major
ba66ae94 376 * version bump.
8bfb108b 377 * sizeof(AVProgram) must not be used outside libav*.
ba66ae94 378 */
15afa396
NS
379typedef struct AVProgram {
380 int id;
381 char *provider_name; ///< Network name for DVB streams
382 char *name; ///< Service name for DVB streams
383 int flags;
384 enum AVDiscard discard; ///< selects which program to discard and which to feed to the caller
526efa10
NS
385 unsigned int *stream_index;
386 unsigned int nb_stream_indexes;
15afa396
NS
387} AVProgram;
388
43d414ba 389#define AVFMTCTX_NOHEADER 0x0001 /**< signal that no header is present
da24c5e3
FB
390 (streams are added dynamically) */
391
de6d9b64
FB
392#define MAX_STREAMS 20
393
252f17e2
MN
394/**
395 * format I/O context.
396 * New fields can be added to the end with minor version bumps.
8bfb108b 397 * Removal, reordering and changes to existing fields require a major
252f17e2 398 * version bump.
8bfb108b 399 * sizeof(AVFormatContext) must not be used outside libav*.
252f17e2 400 */
de6d9b64 401typedef struct AVFormatContext {
43d414ba 402 const AVClass *av_class; /**< set by av_alloc_format_context */
b9a281db
FB
403 /* can only be iformat or oformat, not both at the same time */
404 struct AVInputFormat *iformat;
405 struct AVOutputFormat *oformat;
de6d9b64 406 void *priv_data;
899681cd 407 ByteIOContext *pb;
db69c2e5 408 unsigned int nb_streams;
de6d9b64 409 AVStream *streams[MAX_STREAMS];
43d414ba 410 char filename[1024]; /**< input or output filename */
de6d9b64 411 /* stream info */
4568325a 412 int64_t timestamp;
de6d9b64
FB
413 char title[512];
414 char author[512];
415 char copyright[512];
416 char comment[512];
6a58e151 417 char album[512];
43d414ba
PI
418 int year; /**< ID3 year, 0 if none */
419 int track; /**< track number, 0 if none */
420 char genre[32]; /**< ID3 genre */
6a58e151 421
43d414ba 422 int ctx_flags; /**< format specific flags, see AVFMTCTX_xx */
916c80e9 423 /* private data for pts handling (do not modify directly) */
43d414ba 424 /** This buffer is only needed when packets were already buffered but
de6d9b64
FB
425 not decoded, for example to get the codec parameters in mpeg
426 streams */
ee404803
FB
427 struct AVPacketList *packet_buffer;
428
43d414ba 429 /** decoding: position of the first frame of the component, in
ee404803
FB
430 AV_TIME_BASE fractional seconds. NEVER set this value directly:
431 it is deduced from the AVStream values. */
115329f1 432 int64_t start_time;
43d414ba 433 /** decoding: duration of the stream, in AV_TIME_BASE fractional
ee404803
FB
434 seconds. NEVER set this value directly: it is deduced from the
435 AVStream values. */
436 int64_t duration;
43d414ba 437 /** decoding: total file size. 0 if unknown */
ee404803 438 int64_t file_size;
43d414ba 439 /** decoding: total stream bitrate in bit/s, 0 if not
ee404803
FB
440 available. Never set it directly if the file_size and the
441 duration are known as ffmpeg can compute it automatically. */
442 int bit_rate;
fb2758c8
FB
443
444 /* av_read_frame() support */
445 AVStream *cur_st;
446 const uint8_t *cur_ptr;
447 int cur_len;
448 AVPacket cur_pkt;
449
fb2758c8 450 /* av_seek_frame() support */
43d414ba 451 int64_t data_offset; /** offset of the first packet */
fb2758c8 452 int index_built;
115329f1 453
2db3c638
MN
454 int mux_rate;
455 int packet_size;
17c88cb0
MN
456 int preload;
457 int max_delay;
8108551a 458
115329f1
DB
459#define AVFMT_NOOUTPUTLOOP -1
460#define AVFMT_INFINITEOUTPUTLOOP 0
43d414ba 461 /** number of times to loop output in formats that support it */
8108551a 462 int loop_output;
115329f1 463
30bc6613
MN
464 int flags;
465#define AVFMT_FLAG_GENPTS 0x0001 ///< generate pts if missing even if it requires parsing future frames
2c00106c 466#define AVFMT_FLAG_IGNIDX 0x0002 ///< ignore index
bf09c2e2 467#define AVFMT_FLAG_NONBLOCK 0x0004 ///< do not block when reading packets from input
5894e1bb
VP
468
469 int loop_input;
43d414ba 470 /** decoding: size of data to probe; encoding unused */
9e6c9470 471 unsigned int probesize;
a44b3c4d
MN
472
473 /**
474 * maximum duration in AV_TIME_BASE units over which the input should be analyzed in av_find_stream_info()
475 */
476 int max_analyze_duration;
c964c2c7
RD
477
478 const uint8_t *key;
479 int keylen;
15afa396
NS
480
481 unsigned int nb_programs;
482 AVProgram **programs;
62600469
MN
483
484 /**
485 * Forced video codec_id.
486 * demuxing: set by user
487 */
488 enum CodecID video_codec_id;
489 /**
490 * Forced audio codec_id.
491 * demuxing: set by user
492 */
493 enum CodecID audio_codec_id;
494 /**
495 * Forced subtitle codec_id.
496 * demuxing: set by user
497 */
498 enum CodecID subtitle_codec_id;
3dea63bd
PK
499
500 /**
501 * Maximum amount of memory in bytes to use per stream for the index.
502 * If the needed index exceeds this size entries will be discarded as
503 * needed to maintain a smaller size. This can lead to slower or less
504 * accurate seeking (depends on demuxer).
505 * Demuxers for which a full in memory index is mandatory will ignore
506 * this.
507 * muxing : unused
508 * demuxing: set by user
509 */
510 unsigned int max_index_size;
de6d9b64
FB
511} AVFormatContext;
512
513typedef struct AVPacketList {
514 AVPacket pkt;
515 struct AVPacketList *next;
516} AVPacketList;
517
84be6e72 518#if LIBAVFORMAT_VERSION_INT < (53<<16)
b9a281db
FB
519extern AVInputFormat *first_iformat;
520extern AVOutputFormat *first_oformat;
84be6e72
MN
521#endif
522
523AVInputFormat *av_iformat_next(AVInputFormat *f);
524AVOutputFormat *av_oformat_next(AVOutputFormat *f);
de6d9b64 525
5b6d5596 526enum CodecID av_guess_image2_codec(const char *filename);
290c5fa6 527
b9a281db
FB
528/* XXX: use automatic init with either ELF sections or C file parser */
529/* modules */
de6d9b64 530
b9a281db 531/* utils.c */
b9a281db
FB
532void av_register_input_format(AVInputFormat *format);
533void av_register_output_format(AVOutputFormat *format);
115329f1 534AVOutputFormat *guess_stream_format(const char *short_name,
36ada60c 535 const char *filename, const char *mime_type);
115329f1 536AVOutputFormat *guess_format(const char *short_name,
b9a281db 537 const char *filename, const char *mime_type);
3217cb42
PI
538
539/**
540 * Guesses the codec id based upon muxer and filename.
541 */
115329f1 542enum CodecID av_guess_codec(AVOutputFormat *fmt, const char *short_name,
5b6d5596 543 const char *filename, const char *mime_type, enum CodecType type);
de6d9b64 544
3217cb42 545/**
750f0e1f
PI
546 * Send a nice hexadecimal dump of a buffer to the specified file stream.
547 *
548 * @param f The file stream pointer where the dump should be sent to.
3217cb42
PI
549 * @param buf buffer
550 * @param size buffer size
750f0e1f
PI
551 *
552 * @see av_hex_dump_log, av_pkt_dump, av_pkt_dump_log
3217cb42 553 */
fb2758c8 554void av_hex_dump(FILE *f, uint8_t *buf, int size);
3217cb42
PI
555
556/**
750f0e1f
PI
557 * Send a nice hexadecimal dump of a buffer to the log.
558 *
559 * @param avcl A pointer to an arbitrary struct of which the first field is a
560 * pointer to an AVClass struct.
561 * @param level The importance level of the message, lower values signifying
562 * higher importance.
563 * @param buf buffer
564 * @param size buffer size
565 *
566 * @see av_hex_dump, av_pkt_dump, av_pkt_dump_log
567 */
568void av_hex_dump_log(void *avcl, int level, uint8_t *buf, int size);
569
570/**
571 * Send a nice dump of a packet to the specified file stream.
572 *
573 * @param f The file stream pointer where the dump should be sent to.
3217cb42
PI
574 * @param pkt packet to dump
575 * @param dump_payload true if the payload must be displayed too
576 */
fb2758c8 577void av_pkt_dump(FILE *f, AVPacket *pkt, int dump_payload);
de6d9b64 578
750f0e1f
PI
579/**
580 * Send a nice dump of a packet to the log.
581 *
582 * @param avcl A pointer to an arbitrary struct of which the first field is a
583 * pointer to an AVClass struct.
584 * @param level The importance level of the message, lower values signifying
585 * higher importance.
586 * @param pkt packet to dump
587 * @param dump_payload true if the payload must be displayed too
588 */
589void av_pkt_dump_log(void *avcl, int level, AVPacket *pkt, int dump_payload);
590
94988531 591void av_register_all(void);
de6d9b64 592
43d414ba 593/** codec tag <-> codec id */
6c77805f
MN
594enum CodecID av_codec_get_id(const struct AVCodecTag **tags, unsigned int tag);
595unsigned int av_codec_get_tag(const struct AVCodecTag **tags, enum CodecID id);
7caf0cc6 596
b9a281db 597/* media file input */
3217cb42
PI
598
599/**
600 * finds AVInputFormat based on input format's short name.
601 */
b9a281db 602AVInputFormat *av_find_input_format(const char *short_name);
3217cb42
PI
603
604/**
605 * Guess file format.
606 *
607 * @param is_opened whether the file is already opened, determines whether
608 * demuxers with or without AVFMT_NOFILE are probed
609 */
94988531 610AVInputFormat *av_probe_input_format(AVProbeData *pd, int is_opened);
3217cb42
PI
611
612/**
613 * Allocates all the structures needed to read an input stream.
614 * This does not open the needed codecs for decoding the stream[s].
615 */
115329f1
DB
616int av_open_input_stream(AVFormatContext **ic_ptr,
617 ByteIOContext *pb, const char *filename,
da24c5e3 618 AVInputFormat *fmt, AVFormatParameters *ap);
3217cb42
PI
619
620/**
864ff8c1 621 * Open a media file as input. The codecs are not opened. Only the file
3217cb42
PI
622 * header (if present) is read.
623 *
624 * @param ic_ptr the opened media file handle is put here
625 * @param filename filename to open.
626 * @param fmt if non NULL, force the file format to use
627 * @param buf_size optional buffer size (zero if default is OK)
e42dba48 628 * @param ap additional parameters needed when opening the file (NULL if default)
3217cb42
PI
629 * @return 0 if OK. AVERROR_xxx otherwise.
630 */
115329f1 631int av_open_input_file(AVFormatContext **ic_ptr, const char *filename,
b9a281db
FB
632 AVInputFormat *fmt,
633 int buf_size,
634 AVFormatParameters *ap);
88808c60
MN
635/**
636 * Allocate an AVFormatContext.
5d81d641 637 * Can be freed with av_free() but do not forget to free everything you
88808c60
MN
638 * explicitly allocated as well!
639 */
bc874dae 640AVFormatContext *av_alloc_format_context(void);
b9a281db 641
3217cb42
PI
642/**
643 * Read packets of a media file to get stream information. This
644 * is useful for file formats with no headers such as MPEG. This
645 * function also computes the real frame rate in case of mpeg2 repeat
646 * frame mode.
647 * The logical file position is not changed by this function;
648 * examined packets may be buffered for later processing.
649 *
650 * @param ic media file handle
651 * @return >=0 if OK. AVERROR_xxx if error.
4e8988a3 652 * @todo Let user decide somehow what information is needed so we do not waste time getting stuff the user does not need.
3217cb42 653 */
b9a281db 654int av_find_stream_info(AVFormatContext *ic);
3217cb42
PI
655
656/**
657 * Read a transport packet from a media file.
658 *
864ff8c1 659 * This function is obsolete and should never be used.
3217cb42
PI
660 * Use av_read_frame() instead.
661 *
662 * @param s media file handle
663 * @param pkt is filled
664 * @return 0 if OK. AVERROR_xxx if error.
665 */
de6d9b64 666int av_read_packet(AVFormatContext *s, AVPacket *pkt);
3217cb42
PI
667
668/**
669 * Return the next frame of a stream.
670 *
671 * The returned packet is valid
672 * until the next av_read_frame() or until av_close_input_file() and
673 * must be freed with av_free_packet. For video, the packet contains
674 * exactly one frame. For audio, it contains an integer number of
675 * frames if each frame has a known fixed size (e.g. PCM or ADPCM
676 * data). If the audio frames have a variable size (e.g. MPEG audio),
677 * then it contains one frame.
678 *
679 * pkt->pts, pkt->dts and pkt->duration are always set to correct
a050f802 680 * values in AVStream.timebase units (and guessed if the format cannot
3217cb42
PI
681 * provided them). pkt->pts can be AV_NOPTS_VALUE if the video format
682 * has B frames, so it is better to rely on pkt->dts if you do not
683 * decompress the payload.
684 *
685 * @return 0 if OK, < 0 if error or end of file.
686 */
fb2758c8 687int av_read_frame(AVFormatContext *s, AVPacket *pkt);
3217cb42
PI
688
689/**
690 * Seek to the key frame at timestamp.
691 * 'timestamp' in 'stream_index'.
692 * @param stream_index If stream_index is (-1), a default
693 * stream is selected, and timestamp is automatically converted
694 * from AV_TIME_BASE units to the stream specific time_base.
695 * @param timestamp timestamp in AVStream.time_base units
696 * or if there is no stream specified then in AV_TIME_BASE units
697 * @param flags flags which select direction and seeking mode
698 * @return >= 0 on success
699 */
3ba1438d 700int av_seek_frame(AVFormatContext *s, int stream_index, int64_t timestamp, int flags);
3217cb42
PI
701
702/**
703 * start playing a network based stream (e.g. RTSP stream) at the
704 * current position
705 */
fb2758c8 706int av_read_play(AVFormatContext *s);
3217cb42
PI
707
708/**
709 * Pause a network based stream (e.g. RTSP stream).
710 *
711 * Use av_read_play() to resume it.
712 */
fb2758c8 713int av_read_pause(AVFormatContext *s);
3217cb42
PI
714
715/**
2506fd54
RD
716 * Free a AVFormatContext allocated by av_open_input_stream.
717 * @param s context to free
718 */
719void av_close_input_stream(AVFormatContext *s);
720
721/**
3217cb42
PI
722 * Close a media file (but not its codecs).
723 *
724 * @param s media file handle
725 */
de6d9b64 726void av_close_input_file(AVFormatContext *s);
3217cb42
PI
727
728/**
729 * Add a new stream to a media file.
730 *
731 * Can only be called in the read_header() function. If the flag
732 * AVFMTCTX_NOHEADER is in the format context, then new streams
733 * can be added in read_packet too.
734 *
735 * @param s media file handle
736 * @param id file format dependent stream id
737 */
b9a281db 738AVStream *av_new_stream(AVFormatContext *s, int id);
15afa396 739AVProgram *av_new_program(AVFormatContext *s, int id);
3217cb42
PI
740
741/**
742 * Set the pts for a given stream.
743 *
744 * @param s stream
745 * @param pts_wrap_bits number of bits effectively used by the pts
746 * (used for wrap control, 33 is the value for MPEG)
747 * @param pts_num numerator to convert to seconds (MPEG: 1)
748 * @param pts_den denominator to convert to seconds (MPEG: 90000)
749 */
9ee91c2f 750void av_set_pts_info(AVStream *s, int pts_wrap_bits,
916c80e9 751 int pts_num, int pts_den);
de6d9b64 752
3ba1438d
MN
753#define AVSEEK_FLAG_BACKWARD 1 ///< seek backward
754#define AVSEEK_FLAG_BYTE 2 ///< seeking based on position in bytes
27a5fe5f 755#define AVSEEK_FLAG_ANY 4 ///< seek to any frame, even non keyframes
3ba1438d 756
b754978a 757int av_find_default_stream_index(AVFormatContext *s);
3217cb42
PI
758
759/**
760 * Gets the index for a specific timestamp.
761 * @param flags if AVSEEK_FLAG_BACKWARD then the returned index will correspond to
762 * the timestamp which is <= the requested one, if backward is 0
763 * then it will be >=
764 * if AVSEEK_FLAG_ANY seek to any frame, only keyframes otherwise
765 * @return < 0 if no such timestamp could be found
766 */
dc56fc38 767int av_index_search_timestamp(AVStream *st, int64_t timestamp, int flags);
3217cb42
PI
768
769/**
3dea63bd
PK
770 * Ensures the index uses less memory than the maximum specified in
771 * AVFormatContext.max_index_size, by discarding entries if it grows
772 * too large.
773 * This function is not part of the public API and should only be called
774 * by demuxers.
775 */
776void ff_reduce_index(AVFormatContext *s, int stream_index);
777
778/**
3217cb42
PI
779 * Add a index entry into a sorted list updateing if it is already there.
780 *
781 * @param timestamp timestamp in the timebase of the given stream
782 */
3e9245a9 783int av_add_index_entry(AVStream *st,
30a43f2d 784 int64_t pos, int64_t timestamp, int size, int distance, int flags);
3217cb42
PI
785
786/**
787 * Does a binary search using av_index_search_timestamp() and AVCodec.read_timestamp().
755bfeab 788 * This is not supposed to be called directly by a user application, but by demuxers.
3217cb42
PI
789 * @param target_ts target timestamp in the time base of the given stream
790 * @param stream_index stream number
791 */
3ba1438d 792int av_seek_frame_binary(AVFormatContext *s, int stream_index, int64_t target_ts, int flags);
3217cb42
PI
793
794/**
795 * Updates cur_dts of all streams based on given timestamp and AVStream.
796 *
797 * Stream ref_st unchanged, others set cur_dts in their native timebase
755bfeab 798 * only needed for timestamp wrapping or if (dts not set and pts!=dts).
3217cb42
PI
799 * @param timestamp new dts expressed in time_base of param ref_st
800 * @param ref_st reference stream giving time_base of param timestamp
801 */
22ffac70 802void av_update_cur_dts(AVFormatContext *s, AVStream *ref_st, int64_t timestamp);
3217cb42
PI
803
804/**
805 * Does a binary search using read_timestamp().
755bfeab 806 * This is not supposed to be called directly by a user application, but by demuxers.
3217cb42
PI
807 * @param target_ts target timestamp in the time base of the given stream
808 * @param stream_index stream number
809 */
89ddd2a9 810int64_t av_gen_search(AVFormatContext *s, int stream_index, int64_t target_ts, int64_t pos_min, int64_t pos_max, int64_t pos_limit, int64_t ts_min, int64_t ts_max, int flags, int64_t *ts_ret, int64_t (*read_timestamp)(struct AVFormatContext *, int , int64_t *, int64_t ));
b754978a 811
43d414ba 812/** media file output */
290c5fa6 813int av_set_parameters(AVFormatContext *s, AVFormatParameters *ap);
3217cb42
PI
814
815/**
755bfeab
DB
816 * Allocate the stream private data and write the stream header to an
817 * output media file.
3217cb42
PI
818 *
819 * @param s media file handle
820 * @return 0 if OK. AVERROR_xxx if error.
821 */
b9a281db 822int av_write_header(AVFormatContext *s);
3217cb42
PI
823
824/**
825 * Write a packet to an output media file.
826 *
827 * The packet shall contain one audio or video frame.
828 * The packet must be correctly interleaved according to the container specification,
829 * if not then av_interleaved_write_frame must be used
830 *
831 * @param s media file handle
832 * @param pkt the packet, which contains the stream_index, buf/buf_size, dts/pts, ...
833 * @return < 0 if error, = 0 if OK, 1 if end of stream wanted.
834 */
e928649b 835int av_write_frame(AVFormatContext *s, AVPacket *pkt);
3217cb42
PI
836
837/**
838 * Writes a packet to an output media file ensuring correct interleaving.
839 *
840 * The packet must contain one audio or video frame.
841 * If the packets are already correctly interleaved the application should
90b5b51e
DB
842 * call av_write_frame() instead as it is slightly faster. It is also important
843 * to keep in mind that completely non-interleaved input will need huge amounts
844 * of memory to interleave with this, so it is preferable to interleave at the
845 * demuxer level.
3217cb42
PI
846 *
847 * @param s media file handle
848 * @param pkt the packet, which contains the stream_index, buf/buf_size, dts/pts, ...
849 * @return < 0 if error, = 0 if OK, 1 if end of stream wanted.
850 */
3c895fc0 851int av_interleaved_write_frame(AVFormatContext *s, AVPacket *pkt);
3217cb42
PI
852
853/**
854 * Interleave a packet per DTS in an output media file.
855 *
856 * Packets with pkt->destruct == av_destruct_packet will be freed inside this function,
857 * so they cannot be used after it, note calling av_free_packet() on them is still safe.
858 *
859 * @param s media file handle
860 * @param out the interleaved packet will be output here
861 * @param in the input packet
862 * @param flush 1 if no further packets are available as input and all
863 * remaining packets should be output
864 * @return 1 if a packet was output, 0 if no packet could be output,
865 * < 0 if an error occured
866 */
f21c0b4c 867int av_interleave_packet_per_dts(AVFormatContext *s, AVPacket *out, AVPacket *pkt, int flush);
e928649b 868
3217cb42
PI
869/**
870 * @brief Write the stream trailer to an output media file and
871 * free the file private data.
872 *
873 * @param s media file handle
874 * @return 0 if OK. AVERROR_xxx if error.
875 */
b9a281db 876int av_write_trailer(AVFormatContext *s);
de6d9b64
FB
877
878void dump_format(AVFormatContext *ic,
115329f1 879 int index,
de6d9b64
FB
880 const char *url,
881 int is_output);
3217cb42
PI
882
883/**
884 * parses width and height out of string str.
26ef3220 885 * @deprecated Use av_parse_video_frame_size instead.
3217cb42 886 */
26ef3220 887attribute_deprecated int parse_image_size(int *width_ptr, int *height_ptr, const char *str);
3217cb42
PI
888
889/**
890 * Converts frame rate from string to a fraction.
26ef3220 891 * @deprecated Use av_parse_video_frame_rate instead.
3217cb42 892 */
26ef3220 893attribute_deprecated int parse_frame_rate(int *frame_rate, int *frame_rate_base, const char *arg);
3217cb42
PI
894
895/**
f9436161
SS
896 * Parses \p datestr and returns a corresponding number of microseconds.
897 * @param datestr String representing a date or a duration.
898 * - If a date the syntax is:
3217cb42 899 * @code
3217cb42 900 * [{YYYY-MM-DD|YYYYMMDD}]{T| }{HH[:MM[:SS[.m...]]][Z]|HH[MM[SS[.m...]]][Z]}
3217cb42 901 * @endcode
f9436161
SS
902 * Time is localtime unless Z is appended, in which case it is
903 * interpreted as UTC.
904 * If the year-month-day part isn't specified it takes the current
905 * year-month-day.
906 * Returns the number of microseconds since 1st of January, 1970 up to
907 * the time of the parsed date or INT64_MIN if \p datestr cannot be
908 * successfully parsed.
909 * - If a duration the syntax is:
910 * @code
911 * [-]HH[:MM[:SS[.m...]]]
912 * [-]S+[.m...]
913 * @endcode
914 * Returns the number of microseconds contained in a time interval
915 * with the specified duration or INT64_MIN if \p datestr cannot be
7338d368 916 * successfully parsed.
f9436161
SS
917 * @param duration Flag which tells how to interpret \p datestr, if
918 * not zero \p datestr is interpreted as a duration, otherwise as a
919 * date.
3217cb42 920 */
0c1a9eda 921int64_t parse_date(const char *datestr, int duration);
de6d9b64 922
0c1a9eda 923int64_t av_gettime(void);
94988531 924
de6d9b64
FB
925/* ffm specific for ffserver */
926#define FFM_PACKET_SIZE 4096
927offset_t ffm_read_write_index(int fd);
928void ffm_write_write_index(int fd, offset_t pos);
929void ffm_set_write_index(AVFormatContext *s, offset_t pos, offset_t file_size);
930
3217cb42
PI
931/**
932 * Attempts to find a specific tag in a URL.
933 *
934 * syntax: '?tag1=val1&tag2=val2...'. Little URL decoding is done.
935 * Return 1 if found.
936 */
de6d9b64
FB
937int find_info_tag(char *arg, int arg_size, const char *tag1, const char *info);
938
3217cb42
PI
939/**
940 * Returns in 'buf' the path with '%d' replaced by number.
941
942 * Also handles the '%0nd' format where 'n' is the total number
943 * of digits and '%%'.
944 *
945 * @param buf destination buffer
946 * @param buf_size destination buffer size
947 * @param path numbered sequence string
8ea0e802 948 * @param number frame number
3217cb42
PI
949 * @return 0 if OK, -1 if format error.
950 */
5c07cf53
MB
951int av_get_frame_filename(char *buf, int buf_size,
952 const char *path, int number);
3217cb42
PI
953
954/**
955 * Check whether filename actually is a numbered sequence generator.
956 *
957 * @param filename possible numbered sequence string
958 * @return 1 if a valid numbered sequence string, 0 otherwise.
959 */
5c07cf53 960int av_filename_number_test(const char *filename);
96baaa6a 961
c5388c07
LA
962/**
963 * Generate an SDP for an RTP session.
964 *
965 * @param ac array of AVFormatContexts describing the RTP streams. If the
966 * array is composed by only one context, such context can contain
967 * multiple AVStreams (one AVStream per RTP stream). Otherwise,
968 * all the contexts in the array (an AVCodecContext per RTP stream)
969 * must contain only one AVStream
8767b80f
LA
970 * @param n_files number of AVCodecContexts contained in ac
971 * @param buff buffer where the SDP will be stored (must be allocated by
972 * the caller
973 * @param size the size of the buffer
974 * @return 0 if OK. AVERROR_xxx if error.
c5388c07 975 */
8767b80f 976int avf_sdp_create(AVFormatContext *ac[], int n_files, char *buff, int size);
c5388c07 977
fb025625 978#ifdef HAVE_AV_CONFIG_H
f71869a4 979
39f472c3
FB
980void __dynarray_add(unsigned long **tab_ptr, int *nb_ptr, unsigned long elem);
981
e4e70d2e 982#ifdef __GNUC__
39f472c3
FB
983#define dynarray_add(tab, nb_ptr, elem)\
984do {\
985 typeof(tab) _tab = (tab);\
986 typeof(elem) _elem = (elem);\
987 (void)sizeof(**_tab == _elem); /* check that types are compatible */\
988 __dynarray_add((unsigned long **)_tab, nb_ptr, (unsigned long)_elem);\
989} while(0)
e4e70d2e
FH
990#else
991#define dynarray_add(tab, nb_ptr, elem)\
992do {\
993 __dynarray_add((unsigned long **)(tab), nb_ptr, (unsigned long)(elem));\
994} while(0)
995#endif
39f472c3 996
f71869a4 997time_t mktimegm(struct tm *tm);
0c9fc6e1 998struct tm *brktimegm(time_t secs, struct tm *tm);
115329f1 999const char *small_strptime(const char *p, const char *fmt,
f71869a4
FB
1000 struct tm *dt);
1001
fb025625
FB
1002struct in_addr;
1003int resolve_host(struct in_addr *sin_addr, const char *hostname);
1004
1005void url_split(char *proto, int proto_size,
6ba5cbc6 1006 char *authorization, int authorization_size,
fb025625
FB
1007 char *hostname, int hostname_size,
1008 int *port_ptr,
1009 char *path, int path_size,
1010 const char *url);
1011
a941f391
FB
1012int match_ext(const char *filename, const char *extensions);
1013
fb025625
FB
1014#endif /* HAVE_AV_CONFIG_H */
1015
5b21bdab 1016#endif /* FFMPEG_AVFORMAT_H */