Upgrade 20/24-bit PCM DVD decoder use SAMPLE_FMT_S32. Patch supplied by lars dot...
[libav.git] / libavformat / avformat.h
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1/*
2 * copyright (c) 2001 Fabrice Bellard
3 *
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4 * This file is part of FFmpeg.
5 *
6 * FFmpeg 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 *
b78e7197 11 * FFmpeg 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
b78e7197 17 * License along with FFmpeg; 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 FFMPEG_AVFORMAT_H
22#define FFMPEG_AVFORMAT_H
de6d9b64 23
800c289a 24#define LIBAVFORMAT_VERSION_MAJOR 52
c97429e2 25#define LIBAVFORMAT_VERSION_MINOR 20
800c289a 26#define LIBAVFORMAT_VERSION_MICRO 0
e97ac1e6 27
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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
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38/**
39 * Returns the LIBAVFORMAT_VERSION_INT constant.
40 */
41unsigned avformat_version(void);
42
f71869a4 43#include <time.h>
67070e4f 44#include <stdio.h> /* FILE */
76a448ed 45#include "libavcodec/avcodec.h"
de6d9b64 46
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47#include "avio.h"
48
49/* packet functions */
50
51typedef struct AVPacket {
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52 /**
53 * Presentation time stamp in time_base units.
54 * This is the time at which the decompressed packet will be presented
55 * to the user.
56 * Can be AV_NOPTS_VALUE if it is not stored in the file.
57 * pts MUST be larger or equal to dts as presentation can not happen before
58 * decompression, unless one wants to view hex dumps. Some formats misuse
59 * the terms dts and pts/cts to mean something different, these timestamps
60 * must be converted to true pts/dts before they are stored in AVPacket.
61 */
62 int64_t pts;
63 /**
64 * Decompression time stamp in time_base units.
65 * This is the time at which the packet is decompressed.
66 * Can be AV_NOPTS_VALUE if it is not stored in the file.
67 */
68 int64_t dts;
0c1a9eda 69 uint8_t *data;
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70 int size;
71 int stream_index;
72 int flags;
2692067a 73 int duration; ///< presentation duration in time_base units (0 if not available)
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74 void (*destruct)(struct AVPacket *);
75 void *priv;
2692067a 76 int64_t pos; ///< byte position in stream, -1 if unknown
115329f1 77} AVPacket;
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78#define PKT_FLAG_KEY 0x0001
79
63dd1377 80void av_destruct_packet_nofree(AVPacket *pkt);
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81
82/**
83 * Default packet destructor.
84 */
90ad92b3 85void av_destruct_packet(AVPacket *pkt);
63dd1377 86
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87/**
88 * Initialize optional fields of a packet to default values.
89 *
90 * @param pkt packet
91 */
659596f0 92void av_init_packet(AVPacket *pkt);
de6d9b64 93
3217cb42 94/**
ac3967c1 95 * Allocate the payload of a packet and initialize its fields to default values.
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96 *
97 * @param pkt packet
98 * @param size wanted payload size
99 * @return 0 if OK. AVERROR_xxx otherwise.
100 */
de6d9b64 101int av_new_packet(AVPacket *pkt, int size);
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102
103/**
ac3967c1 104 * Allocate and read the payload of a packet and initialize its fields to default values.
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105 *
106 * @param pkt packet
107 * @param size wanted payload size
108 * @return >0 (read size) if OK. AVERROR_xxx otherwise.
109 */
2692067a 110int av_get_packet(ByteIOContext *s, AVPacket *pkt, int size);
3217cb42 111
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112/**
113 * @warning This is a hack - the packet memory allocation stuff is broken. The
114 * packet is allocated if it was not really allocated
115 */
fb2758c8 116int av_dup_packet(AVPacket *pkt);
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117
118/**
119 * Free a packet
120 *
121 * @param pkt packet to free
122 */
123static inline void av_free_packet(AVPacket *pkt)
124{
342474ab 125 if (pkt && pkt->destruct) {
bb270c08 126 pkt->destruct(pkt);
342474ab 127 }
6fa5a56c 128}
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129
130/*************************************************/
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131/* fractional numbers for exact pts handling */
132
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133/**
134 * the exact value of the fractional number is: 'val + num / den'.
135 * num is assumed to be such as 0 <= num < den
136 * @deprecated Use AVRational instead
137*/
916c80e9 138typedef struct AVFrac {
115329f1 139 int64_t val, num, den;
955ab9a4 140} AVFrac attribute_deprecated;
916c80e9 141
916c80e9 142/*************************************************/
b9a281db 143/* input/output formats */
de6d9b64 144
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145struct AVCodecTag;
146
de6d9b64 147struct AVFormatContext;
b9a281db 148
43d414ba 149/** this structure contains the data a format has to probe a file */
b9a281db 150typedef struct AVProbeData {
5c91a675 151 const char *filename;
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152 unsigned char *buf;
153 int buf_size;
154} AVProbeData;
155
0288a747 156#define AVPROBE_SCORE_MAX 100 ///< max score, half of that is used for file extension based detection
87e87886 157#define AVPROBE_PADDING_SIZE 32 ///< extra allocated bytes at the end of the probe buffer
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158
159typedef struct AVFormatParameters {
c0df9d75 160 AVRational time_base;
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161 int sample_rate;
162 int channels;
163 int width;
164 int height;
4606ac8d 165 enum PixelFormat pix_fmt;
43d414ba 166 int channel; /**< used to select dv channel */
43d414ba 167 const char *standard; /**< tv standard, NTSC, PAL, SECAM */
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168 unsigned int mpeg2ts_raw:1; /**< force raw MPEG2 transport stream output, if possible */
169 unsigned int mpeg2ts_compute_pcr:1; /**< compute exact PCR for each transport
170 stream packet (only meaningful if
171 mpeg2ts_raw is TRUE) */
172 unsigned int initial_pause:1; /**< do not begin to play the stream
173 immediately (RTSP only) */
174 unsigned int prealloced_context:1;
71957315 175#if LIBAVFORMAT_VERSION_INT < (53<<16)
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176 enum CodecID video_codec_id;
177 enum CodecID audio_codec_id;
71957315 178#endif
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179} AVFormatParameters;
180
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181//! demuxer will use url_fopen, no opened file should be provided by the caller
182#define AVFMT_NOFILE 0x0001
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183#define AVFMT_NEEDNUMBER 0x0002 /**< needs '%d' in filename */
184#define AVFMT_SHOW_IDS 0x0008 /**< show format stream IDs numbers */
185#define AVFMT_RAWPICTURE 0x0020 /**< format wants AVPicture structure for
fb025625 186 raw picture data */
43d414ba 187#define AVFMT_GLOBALHEADER 0x0040 /**< format wants global header */
755bfeab 188#define AVFMT_NOTIMESTAMPS 0x0080 /**< format does not need / have any timestamps */
43d414ba 189#define AVFMT_GENERIC_INDEX 0x0100 /**< use generic index building code */
ff9c8d7c 190#define AVFMT_TS_DISCONT 0x0200 /**< format allows timestamo discontinuities */
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191
192typedef struct AVOutputFormat {
de6d9b64 193 const char *name;
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194 /**
195 * Descriptive name for the format, meant to be more human-readable
196 * than \p name. You \e should use the NULL_IF_CONFIG_SMALL() macro
197 * to define it.
198 */
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199 const char *long_name;
200 const char *mime_type;
cf29452b 201 const char *extensions; /**< comma separated filename extensions */
43d414ba 202 /** size of private data so that it can be allocated in the wrapper */
b9a281db 203 int priv_data_size;
de6d9b64 204 /* output support */
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205 enum CodecID audio_codec; /**< default audio codec */
206 enum CodecID video_codec; /**< default video codec */
de6d9b64 207 int (*write_header)(struct AVFormatContext *);
e928649b 208 int (*write_packet)(struct AVFormatContext *, AVPacket *pkt);
de6d9b64 209 int (*write_trailer)(struct AVFormatContext *);
43d414ba 210 /** can use flags: AVFMT_NOFILE, AVFMT_NEEDNUMBER, AVFMT_GLOBALHEADER */
b9a281db 211 int flags;
43d414ba 212 /** currently only used to set pixel format if not YUV420P */
290c5fa6 213 int (*set_parameters)(struct AVFormatContext *, AVFormatParameters *);
fe2d6fe2 214 int (*interleave_packet)(struct AVFormatContext *, AVPacket *out, AVPacket *in, int flush);
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215
216 /**
217 * list of supported codec_id-codec_tag pairs, ordered by "better choice first"
218 * the arrays are all CODEC_ID_NONE terminated
219 */
6c77805f 220 const struct AVCodecTag **codec_tag;
7caf0cc6 221
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222 enum CodecID subtitle_codec; /**< default subtitle codec */
223
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224 /* private fields */
225 struct AVOutputFormat *next;
226} AVOutputFormat;
de6d9b64 227
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228typedef struct AVInputFormat {
229 const char *name;
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230 /**
231 * Descriptive name for the format, meant to be more human-readable
232 * than \p name. You \e should use the NULL_IF_CONFIG_SMALL() macro
233 * to define it.
234 */
b9a281db 235 const char *long_name;
43d414ba 236 /** size of private data so that it can be allocated in the wrapper */
b9a281db 237 int priv_data_size;
65d7d68b 238 /**
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239 * Tell if a given file has a chance of being parsed by this format.
240 * The buffer provided is guaranteed to be AVPROBE_PADDING_SIZE bytes
241 * big so you do not have to check for that unless you need more.
65d7d68b 242 */
b9a281db 243 int (*read_probe)(AVProbeData *);
43d414ba 244 /** read the format header and initialize the AVFormatContext
de6d9b64 245 structure. Return 0 if OK. 'ap' if non NULL contains
e42dba48 246 additional paramters. Only used in raw format right
b9a281db 247 now. 'av_new_stream' should be called to create new streams. */
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248 int (*read_header)(struct AVFormatContext *,
249 AVFormatParameters *ap);
43d414ba 250 /** read one packet and put it in 'pkt'. pts and flags are also
b9a281db 251 set. 'av_new_stream' can be called only if the flag
da24c5e3 252 AVFMTCTX_NOHEADER is used. */
de6d9b64 253 int (*read_packet)(struct AVFormatContext *, AVPacket *pkt);
43d414ba 254 /** close the stream. The AVFormatContext and AVStreams are not
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255 freed by this function */
256 int (*read_close)(struct AVFormatContext *);
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257 /**
258 * seek to a given timestamp relative to the frames in
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259 * stream component stream_index
260 * @param stream_index must not be -1
115329f1 261 * @param flags selects which direction should be preferred if no exact
3ba1438d 262 * match is available
05ce0f11 263 * @return >= 0 on success (but not necessarily the new offset)
3ba1438d 264 */
115329f1 265 int (*read_seek)(struct AVFormatContext *,
3ba1438d 266 int stream_index, int64_t timestamp, int flags);
8d14a25c 267 /**
2576a9ec 268 * gets the next timestamp in stream[stream_index].time_base units.
d9526386 269 * @return the timestamp or AV_NOPTS_VALUE if an error occurred
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270 */
271 int64_t (*read_timestamp)(struct AVFormatContext *s, int stream_index,
272 int64_t *pos, int64_t pos_limit);
43d414ba 273 /** can use flags: AVFMT_NOFILE, AVFMT_NEEDNUMBER */
de6d9b64 274 int flags;
43d414ba 275 /** if extensions are defined, then no probe is done. You should
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276 usually not use extension format guessing because it is not
277 reliable enough */
278 const char *extensions;
43d414ba 279 /** general purpose read only value that the format can use */
b9a281db 280 int value;
fb2758c8 281
43d414ba 282 /** start/resume playing - only meaningful if using a network based format
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283 (RTSP) */
284 int (*read_play)(struct AVFormatContext *);
285
43d414ba 286 /** pause playing - only meaningful if using a network based format
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287 (RTSP) */
288 int (*read_pause)(struct AVFormatContext *);
289
6c77805f 290 const struct AVCodecTag **codec_tag;
7caf0cc6 291
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292 /* private fields */
293 struct AVInputFormat *next;
294} AVInputFormat;
de6d9b64 295
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296enum AVStreamParseType {
297 AVSTREAM_PARSE_NONE,
298 AVSTREAM_PARSE_FULL, /**< full parsing and repack */
299 AVSTREAM_PARSE_HEADERS, /**< only parse headers, don't repack */
300 AVSTREAM_PARSE_TIMESTAMPS, /**< full parsing and interpolation of timestamps for frames not starting on packet boundary */
301};
302
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303typedef struct AVIndexEntry {
304 int64_t pos;
305 int64_t timestamp;
306#define AVINDEX_KEYFRAME 0x0001
30a43f2d 307 int flags:2;
90b5b51e 308 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 309 int min_distance; /**< min distance between this and the previous keyframe, used to avoid unneeded searching */
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310} AVIndexEntry;
311
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312#define AV_DISPOSITION_DEFAULT 0x0001
313#define AV_DISPOSITION_DUB 0x0002
314#define AV_DISPOSITION_ORIGINAL 0x0004
315#define AV_DISPOSITION_COMMENT 0x0008
316#define AV_DISPOSITION_LYRICS 0x0010
317#define AV_DISPOSITION_KARAOKE 0x0020
318
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319/**
320 * Stream structure.
321 * New fields can be added to the end with minor version bumps.
8bfb108b 322 * Removal, reordering and changes to existing fields require a major
ba66ae94 323 * version bump.
8bfb108b 324 * sizeof(AVStream) must not be used outside libav*.
ba66ae94 325 */
de6d9b64 326typedef struct AVStream {
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327 int index; /**< stream index in AVFormatContext */
328 int id; /**< format specific stream id */
329 AVCodecContext *codec; /**< codec context */
b4b87d48 330 /**
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331 * Real base frame rate of the stream.
332 * This is the lowest frame rate with which all timestamps can be
864ff8c1 333 * represented accurately (it is the least common multiple of all
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334 * frame rates in the stream), Note, this value is just a guess!
335 * For example if the timebase is 1/90000 and all frames have either
336 * approximately 3600 or 1800 timer ticks then r_frame_rate will be 50/1.
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337 */
338 AVRational r_frame_rate;
de6d9b64 339 void *priv_data;
82583548 340
b9a281db 341 /* internal data used in av_find_stream_info() */
82583548 342 int64_t first_dts;
43d414ba 343 /** encoding: PTS generation when outputing stream */
a9fd2b19 344 struct AVFrac pts;
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345
346 /**
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347 * This is the fundamental unit of time (in seconds) in terms
348 * of which frame timestamps are represented. For fixed-fps content,
349 * timebase should be 1/frame rate and timestamp increments should be
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350 * identically 1.
351 */
9ee91c2f 352 AVRational time_base;
43d414ba 353 int pts_wrap_bits; /**< number of bits in pts (used for wrapping control) */
a48b7a6b 354 /* ffmpeg.c private use */
15786dc4 355 int stream_copy; /**< if set, just copy stream */
755bfeab 356 enum AVDiscard discard; ///< selects which packets can be discarded at will and do not need to be demuxed
b4aea108 357 //FIXME move stuff to a flags field?
43d414ba 358 /** quality, as it has been removed from AVCodecContext and put in AVVideoFrame
755bfeab 359 * MN: dunno if that is the right place for it */
115329f1 360 float quality;
6d96a9b9 361 /**
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362 * Decoding: pts of the first frame of the stream, in stream time base.
363 * Only set this if you are absolutely 100% sure that the value you set
364 * it to really is the pts of the first frame.
4854c253 365 * This may be undefined (AV_NOPTS_VALUE).
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366 * @note The ASF header does NOT contain a correct start_time the ASF
367 * demuxer must NOT set this.
6d96a9b9 368 */
115329f1 369 int64_t start_time;
e26381b6 370 /**
8bfb108b 371 * Decoding: duration of the stream, in stream time base.
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372 * If a source file does not specify a duration, but does specify
373 * a bitrate, this value will be estimates from bit rate and file size.
374 */
ee404803 375 int64_t duration;
fb2758c8 376
43d414ba 377 char language[4]; /** ISO 639 3-letter language code (empty string if undefined) */
09730260 378
fb2758c8 379 /* av_read_frame() support */
57004ff1 380 enum AVStreamParseType need_parsing;
fb2758c8 381 struct AVCodecParserContext *parser;
6ec87caa 382
fb2758c8 383 int64_t cur_dts;
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384 int last_IP_duration;
385 int64_t last_IP_pts;
fb2758c8 386 /* av_seek_frame() support */
43d414ba 387 AVIndexEntry *index_entries; /**< only used if the format does not
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388 support seeking natively */
389 int nb_index_entries;
191e8ca7 390 unsigned int index_entries_allocated_size;
115329f1 391
b4b87d48 392 int64_t nb_frames; ///< number of frames in this stream if known or 0
504ee036 393
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394#if LIBAVFORMAT_VERSION_INT < (53<<16)
395 int64_t unused[4+1];
396#endif
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397
398 char *filename; /**< source filename of the stream */
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399
400 int disposition; /**< AV_DISPOSITION_* bitfield */
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401
402 AVProbeData probe_data;
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403#define MAX_REORDER_DELAY 16
404 int64_t pts_buffer[MAX_REORDER_DELAY+1];
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405} AVStream;
406
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407#define AV_PROGRAM_RUNNING 1
408
ba66ae94 409/**
ba66ae94 410 * New fields can be added to the end with minor version bumps.
8bfb108b 411 * Removal, reordering and changes to existing fields require a major
ba66ae94 412 * version bump.
8bfb108b 413 * sizeof(AVProgram) must not be used outside libav*.
ba66ae94 414 */
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415typedef struct AVProgram {
416 int id;
417 char *provider_name; ///< Network name for DVB streams
418 char *name; ///< Service name for DVB streams
419 int flags;
420 enum AVDiscard discard; ///< selects which program to discard and which to feed to the caller
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421 unsigned int *stream_index;
422 unsigned int nb_stream_indexes;
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423} AVProgram;
424
43d414ba 425#define AVFMTCTX_NOHEADER 0x0001 /**< signal that no header is present
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426 (streams are added dynamically) */
427
79d7836a 428typedef struct AVChapter {
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429 int id; ///< Unique id to identify the chapter
430 AVRational time_base; ///< Timebase in which the start/end timestamps are specified
8931e7b4 431 int64_t start, end; ///< chapter start/end time in time_base units
c2fb6be4 432 char *title; ///< chapter title
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433} AVChapter;
434
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435#define MAX_STREAMS 20
436
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437/**
438 * format I/O context.
439 * New fields can be added to the end with minor version bumps.
8bfb108b 440 * Removal, reordering and changes to existing fields require a major
252f17e2 441 * version bump.
8bfb108b 442 * sizeof(AVFormatContext) must not be used outside libav*.
252f17e2 443 */
de6d9b64 444typedef struct AVFormatContext {
43d414ba 445 const AVClass *av_class; /**< set by av_alloc_format_context */
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446 /* can only be iformat or oformat, not both at the same time */
447 struct AVInputFormat *iformat;
448 struct AVOutputFormat *oformat;
de6d9b64 449 void *priv_data;
899681cd 450 ByteIOContext *pb;
db69c2e5 451 unsigned int nb_streams;
de6d9b64 452 AVStream *streams[MAX_STREAMS];
43d414ba 453 char filename[1024]; /**< input or output filename */
de6d9b64 454 /* stream info */
4568325a 455 int64_t timestamp;
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456 char title[512];
457 char author[512];
458 char copyright[512];
459 char comment[512];
6a58e151 460 char album[512];
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461 int year; /**< ID3 year, 0 if none */
462 int track; /**< track number, 0 if none */
463 char genre[32]; /**< ID3 genre */
6a58e151 464
43d414ba 465 int ctx_flags; /**< format specific flags, see AVFMTCTX_xx */
916c80e9 466 /* private data for pts handling (do not modify directly) */
43d414ba 467 /** This buffer is only needed when packets were already buffered but
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468 not decoded, for example to get the codec parameters in mpeg
469 streams */
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470 struct AVPacketList *packet_buffer;
471
43d414ba 472 /** decoding: position of the first frame of the component, in
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473 AV_TIME_BASE fractional seconds. NEVER set this value directly:
474 it is deduced from the AVStream values. */
115329f1 475 int64_t start_time;
43d414ba 476 /** decoding: duration of the stream, in AV_TIME_BASE fractional
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477 seconds. NEVER set this value directly: it is deduced from the
478 AVStream values. */
479 int64_t duration;
43d414ba 480 /** decoding: total file size. 0 if unknown */
ee404803 481 int64_t file_size;
43d414ba 482 /** decoding: total stream bitrate in bit/s, 0 if not
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483 available. Never set it directly if the file_size and the
484 duration are known as ffmpeg can compute it automatically. */
485 int bit_rate;
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486
487 /* av_read_frame() support */
488 AVStream *cur_st;
489 const uint8_t *cur_ptr;
490 int cur_len;
491 AVPacket cur_pkt;
492
fb2758c8 493 /* av_seek_frame() support */
43d414ba 494 int64_t data_offset; /** offset of the first packet */
fb2758c8 495 int index_built;
115329f1 496
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497 int mux_rate;
498 int packet_size;
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499 int preload;
500 int max_delay;
8108551a 501
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502#define AVFMT_NOOUTPUTLOOP -1
503#define AVFMT_INFINITEOUTPUTLOOP 0
43d414ba 504 /** number of times to loop output in formats that support it */
8108551a 505 int loop_output;
115329f1 506
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507 int flags;
508#define AVFMT_FLAG_GENPTS 0x0001 ///< generate pts if missing even if it requires parsing future frames
2c00106c 509#define AVFMT_FLAG_IGNIDX 0x0002 ///< ignore index
bf09c2e2 510#define AVFMT_FLAG_NONBLOCK 0x0004 ///< do not block when reading packets from input
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511
512 int loop_input;
43d414ba 513 /** decoding: size of data to probe; encoding unused */
9e6c9470 514 unsigned int probesize;
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515
516 /**
517 * maximum duration in AV_TIME_BASE units over which the input should be analyzed in av_find_stream_info()
518 */
519 int max_analyze_duration;
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520
521 const uint8_t *key;
522 int keylen;
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523
524 unsigned int nb_programs;
525 AVProgram **programs;
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526
527 /**
528 * Forced video codec_id.
529 * demuxing: set by user
530 */
531 enum CodecID video_codec_id;
532 /**
533 * Forced audio codec_id.
534 * demuxing: set by user
535 */
536 enum CodecID audio_codec_id;
537 /**
538 * Forced subtitle codec_id.
539 * demuxing: set by user
540 */
541 enum CodecID subtitle_codec_id;
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542
543 /**
544 * Maximum amount of memory in bytes to use per stream for the index.
545 * If the needed index exceeds this size entries will be discarded as
546 * needed to maintain a smaller size. This can lead to slower or less
547 * accurate seeking (depends on demuxer).
548 * Demuxers for which a full in memory index is mandatory will ignore
549 * this.
550 * muxing : unused
551 * demuxing: set by user
552 */
553 unsigned int max_index_size;
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554
555 /**
ffa71b2b 556 * Maximum amount of memory in bytes to use for buffering frames
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557 * obtained from real-time capture devices.
558 */
559 unsigned int max_picture_buffer;
79d7836a 560
fbabf1e9 561 unsigned int nb_chapters;
79d7836a 562 AVChapter **chapters;
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563
564 /**
565 * Flags to enable debuging.
566 */
567 int debug;
568#define FF_FDEBUG_TS 0x0001
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569
570 /**
571 * raw packets from the demuxer, prior to parsing and decoding.
572 * This buffer is used for buffering packets until the codec can
573 * be identified, as parsing cannot be done without knowing the
574 * codec.
575 */
576 struct AVPacketList *raw_packet_buffer;
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577 struct AVPacketList *raw_packet_buffer_end;
578
579 struct AVPacketList *packet_buffer_end;
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580} AVFormatContext;
581
582typedef struct AVPacketList {
583 AVPacket pkt;
584 struct AVPacketList *next;
585} AVPacketList;
586
84be6e72 587#if LIBAVFORMAT_VERSION_INT < (53<<16)
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588extern AVInputFormat *first_iformat;
589extern AVOutputFormat *first_oformat;
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590#endif
591
592AVInputFormat *av_iformat_next(AVInputFormat *f);
593AVOutputFormat *av_oformat_next(AVOutputFormat *f);
de6d9b64 594
5b6d5596 595enum CodecID av_guess_image2_codec(const char *filename);
290c5fa6 596
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597/* XXX: use automatic init with either ELF sections or C file parser */
598/* modules */
de6d9b64 599
b9a281db 600/* utils.c */
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601void av_register_input_format(AVInputFormat *format);
602void av_register_output_format(AVOutputFormat *format);
115329f1 603AVOutputFormat *guess_stream_format(const char *short_name,
36ada60c 604 const char *filename, const char *mime_type);
115329f1 605AVOutputFormat *guess_format(const char *short_name,
b9a281db 606 const char *filename, const char *mime_type);
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607
608/**
609 * Guesses the codec id based upon muxer and filename.
610 */
115329f1 611enum CodecID av_guess_codec(AVOutputFormat *fmt, const char *short_name,
5b6d5596 612 const char *filename, const char *mime_type, enum CodecType type);
de6d9b64 613
3217cb42 614/**
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615 * Send a nice hexadecimal dump of a buffer to the specified file stream.
616 *
617 * @param f The file stream pointer where the dump should be sent to.
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618 * @param buf buffer
619 * @param size buffer size
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620 *
621 * @see av_hex_dump_log, av_pkt_dump, av_pkt_dump_log
3217cb42 622 */
fb2758c8 623void av_hex_dump(FILE *f, uint8_t *buf, int size);
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624
625/**
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626 * Send a nice hexadecimal dump of a buffer to the log.
627 *
628 * @param avcl A pointer to an arbitrary struct of which the first field is a
629 * pointer to an AVClass struct.
630 * @param level The importance level of the message, lower values signifying
631 * higher importance.
632 * @param buf buffer
633 * @param size buffer size
634 *
635 * @see av_hex_dump, av_pkt_dump, av_pkt_dump_log
636 */
637void av_hex_dump_log(void *avcl, int level, uint8_t *buf, int size);
638
639/**
640 * Send a nice dump of a packet to the specified file stream.
641 *
642 * @param f The file stream pointer where the dump should be sent to.
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643 * @param pkt packet to dump
644 * @param dump_payload true if the payload must be displayed too
645 */
fb2758c8 646void av_pkt_dump(FILE *f, AVPacket *pkt, int dump_payload);
de6d9b64 647
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648/**
649 * Send a nice dump of a packet to the log.
650 *
651 * @param avcl A pointer to an arbitrary struct of which the first field is a
652 * pointer to an AVClass struct.
653 * @param level The importance level of the message, lower values signifying
654 * higher importance.
655 * @param pkt packet to dump
656 * @param dump_payload true if the payload must be displayed too
657 */
658void av_pkt_dump_log(void *avcl, int level, AVPacket *pkt, int dump_payload);
659
94988531 660void av_register_all(void);
de6d9b64 661
43d414ba 662/** codec tag <-> codec id */
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663enum CodecID av_codec_get_id(const struct AVCodecTag **tags, unsigned int tag);
664unsigned int av_codec_get_tag(const struct AVCodecTag **tags, enum CodecID id);
7caf0cc6 665
b9a281db 666/* media file input */
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667
668/**
669 * finds AVInputFormat based on input format's short name.
670 */
b9a281db 671AVInputFormat *av_find_input_format(const char *short_name);
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672
673/**
674 * Guess file format.
675 *
676 * @param is_opened whether the file is already opened, determines whether
677 * demuxers with or without AVFMT_NOFILE are probed
678 */
94988531 679AVInputFormat *av_probe_input_format(AVProbeData *pd, int is_opened);
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680
681/**
682 * Allocates all the structures needed to read an input stream.
683 * This does not open the needed codecs for decoding the stream[s].
684 */
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685int av_open_input_stream(AVFormatContext **ic_ptr,
686 ByteIOContext *pb, const char *filename,
da24c5e3 687 AVInputFormat *fmt, AVFormatParameters *ap);
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688
689/**
864ff8c1 690 * Open a media file as input. The codecs are not opened. Only the file
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691 * header (if present) is read.
692 *
693 * @param ic_ptr the opened media file handle is put here
694 * @param filename filename to open.
695 * @param fmt if non NULL, force the file format to use
696 * @param buf_size optional buffer size (zero if default is OK)
e42dba48 697 * @param ap additional parameters needed when opening the file (NULL if default)
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698 * @return 0 if OK. AVERROR_xxx otherwise.
699 */
115329f1 700int av_open_input_file(AVFormatContext **ic_ptr, const char *filename,
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701 AVInputFormat *fmt,
702 int buf_size,
703 AVFormatParameters *ap);
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704/**
705 * Allocate an AVFormatContext.
5d81d641 706 * Can be freed with av_free() but do not forget to free everything you
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707 * explicitly allocated as well!
708 */
bc874dae 709AVFormatContext *av_alloc_format_context(void);
b9a281db 710
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711/**
712 * Read packets of a media file to get stream information. This
713 * is useful for file formats with no headers such as MPEG. This
714 * function also computes the real frame rate in case of mpeg2 repeat
715 * frame mode.
716 * The logical file position is not changed by this function;
717 * examined packets may be buffered for later processing.
718 *
719 * @param ic media file handle
720 * @return >=0 if OK. AVERROR_xxx if error.
4e8988a3 721 * @todo Let user decide somehow what information is needed so we do not waste time getting stuff the user does not need.
3217cb42 722 */
b9a281db 723int av_find_stream_info(AVFormatContext *ic);
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724
725/**
726 * Read a transport packet from a media file.
727 *
864ff8c1 728 * This function is obsolete and should never be used.
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729 * Use av_read_frame() instead.
730 *
731 * @param s media file handle
732 * @param pkt is filled
733 * @return 0 if OK. AVERROR_xxx if error.
734 */
de6d9b64 735int av_read_packet(AVFormatContext *s, AVPacket *pkt);
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736
737/**
738 * Return the next frame of a stream.
739 *
740 * The returned packet is valid
741 * until the next av_read_frame() or until av_close_input_file() and
742 * must be freed with av_free_packet. For video, the packet contains
743 * exactly one frame. For audio, it contains an integer number of
744 * frames if each frame has a known fixed size (e.g. PCM or ADPCM
745 * data). If the audio frames have a variable size (e.g. MPEG audio),
746 * then it contains one frame.
747 *
748 * pkt->pts, pkt->dts and pkt->duration are always set to correct
a050f802 749 * values in AVStream.timebase units (and guessed if the format cannot
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750 * provided them). pkt->pts can be AV_NOPTS_VALUE if the video format
751 * has B frames, so it is better to rely on pkt->dts if you do not
752 * decompress the payload.
753 *
754 * @return 0 if OK, < 0 if error or end of file.
755 */
fb2758c8 756int av_read_frame(AVFormatContext *s, AVPacket *pkt);
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757
758/**
759 * Seek to the key frame at timestamp.
760 * 'timestamp' in 'stream_index'.
761 * @param stream_index If stream_index is (-1), a default
762 * stream is selected, and timestamp is automatically converted
763 * from AV_TIME_BASE units to the stream specific time_base.
764 * @param timestamp timestamp in AVStream.time_base units
765 * or if there is no stream specified then in AV_TIME_BASE units
766 * @param flags flags which select direction and seeking mode
767 * @return >= 0 on success
768 */
3ba1438d 769int av_seek_frame(AVFormatContext *s, int stream_index, int64_t timestamp, int flags);
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770
771/**
772 * start playing a network based stream (e.g. RTSP stream) at the
773 * current position
774 */
fb2758c8 775int av_read_play(AVFormatContext *s);
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776
777/**
778 * Pause a network based stream (e.g. RTSP stream).
779 *
780 * Use av_read_play() to resume it.
781 */
fb2758c8 782int av_read_pause(AVFormatContext *s);
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783
784/**
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785 * Free a AVFormatContext allocated by av_open_input_stream.
786 * @param s context to free
787 */
788void av_close_input_stream(AVFormatContext *s);
789
790/**
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791 * Close a media file (but not its codecs).
792 *
793 * @param s media file handle
794 */
de6d9b64 795void av_close_input_file(AVFormatContext *s);
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796
797/**
798 * Add a new stream to a media file.
799 *
800 * Can only be called in the read_header() function. If the flag
801 * AVFMTCTX_NOHEADER is in the format context, then new streams
802 * can be added in read_packet too.
803 *
804 * @param s media file handle
805 * @param id file format dependent stream id
806 */
b9a281db 807AVStream *av_new_stream(AVFormatContext *s, int id);
15afa396 808AVProgram *av_new_program(AVFormatContext *s, int id);
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809
810/**
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811 * Add a new chapter.
812 * This function is NOT part of the public API
813 * and should be ONLY used by demuxers.
814 *
815 * @param s media file handle
7a2a3e8e 816 * @param id unique id for this chapter
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817 * @param start chapter start time in time_base units
818 * @param end chapter end time in time_base units
79d7836a 819 * @param title chapter title
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820 *
821 * @return AVChapter or NULL if error.
79d7836a 822 */
abd2256d 823AVChapter *ff_new_chapter(AVFormatContext *s, int id, AVRational time_base, int64_t start, int64_t end, const char *title);
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824
825/**
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826 * Set the pts for a given stream.
827 *
828 * @param s stream
829 * @param pts_wrap_bits number of bits effectively used by the pts
830 * (used for wrap control, 33 is the value for MPEG)
831 * @param pts_num numerator to convert to seconds (MPEG: 1)
832 * @param pts_den denominator to convert to seconds (MPEG: 90000)
833 */
9ee91c2f 834void av_set_pts_info(AVStream *s, int pts_wrap_bits,
916c80e9 835 int pts_num, int pts_den);
de6d9b64 836
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837#define AVSEEK_FLAG_BACKWARD 1 ///< seek backward
838#define AVSEEK_FLAG_BYTE 2 ///< seeking based on position in bytes
27a5fe5f 839#define AVSEEK_FLAG_ANY 4 ///< seek to any frame, even non keyframes
3ba1438d 840
b754978a 841int av_find_default_stream_index(AVFormatContext *s);
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842
843/**
844 * Gets the index for a specific timestamp.
845 * @param flags if AVSEEK_FLAG_BACKWARD then the returned index will correspond to
846 * the timestamp which is <= the requested one, if backward is 0
847 * then it will be >=
848 * if AVSEEK_FLAG_ANY seek to any frame, only keyframes otherwise
849 * @return < 0 if no such timestamp could be found
850 */
dc56fc38 851int av_index_search_timestamp(AVStream *st, int64_t timestamp, int flags);
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852
853/**
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854 * Ensures the index uses less memory than the maximum specified in
855 * AVFormatContext.max_index_size, by discarding entries if it grows
856 * too large.
857 * This function is not part of the public API and should only be called
858 * by demuxers.
859 */
860void ff_reduce_index(AVFormatContext *s, int stream_index);
861
862/**
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863 * Add a index entry into a sorted list updateing if it is already there.
864 *
865 * @param timestamp timestamp in the timebase of the given stream
866 */
3e9245a9 867int av_add_index_entry(AVStream *st,
30a43f2d 868 int64_t pos, int64_t timestamp, int size, int distance, int flags);
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869
870/**
871 * Does a binary search using av_index_search_timestamp() and AVCodec.read_timestamp().
755bfeab 872 * This is not supposed to be called directly by a user application, but by demuxers.
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873 * @param target_ts target timestamp in the time base of the given stream
874 * @param stream_index stream number
875 */
3ba1438d 876int av_seek_frame_binary(AVFormatContext *s, int stream_index, int64_t target_ts, int flags);
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877
878/**
879 * Updates cur_dts of all streams based on given timestamp and AVStream.
880 *
881 * Stream ref_st unchanged, others set cur_dts in their native timebase
755bfeab 882 * only needed for timestamp wrapping or if (dts not set and pts!=dts).
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883 * @param timestamp new dts expressed in time_base of param ref_st
884 * @param ref_st reference stream giving time_base of param timestamp
885 */
22ffac70 886void av_update_cur_dts(AVFormatContext *s, AVStream *ref_st, int64_t timestamp);
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887
888/**
889 * Does a binary search using read_timestamp().
755bfeab 890 * This is not supposed to be called directly by a user application, but by demuxers.
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891 * @param target_ts target timestamp in the time base of the given stream
892 * @param stream_index stream number
893 */
89ddd2a9 894int64_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 895
43d414ba 896/** media file output */
290c5fa6 897int av_set_parameters(AVFormatContext *s, AVFormatParameters *ap);
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898
899/**
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900 * Allocate the stream private data and write the stream header to an
901 * output media file.
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902 *
903 * @param s media file handle
904 * @return 0 if OK. AVERROR_xxx if error.
905 */
b9a281db 906int av_write_header(AVFormatContext *s);
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907
908/**
909 * Write a packet to an output media file.
910 *
911 * The packet shall contain one audio or video frame.
912 * The packet must be correctly interleaved according to the container specification,
913 * if not then av_interleaved_write_frame must be used
914 *
915 * @param s media file handle
916 * @param pkt the packet, which contains the stream_index, buf/buf_size, dts/pts, ...
917 * @return < 0 if error, = 0 if OK, 1 if end of stream wanted.
918 */
e928649b 919int av_write_frame(AVFormatContext *s, AVPacket *pkt);
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920
921/**
922 * Writes a packet to an output media file ensuring correct interleaving.
923 *
924 * The packet must contain one audio or video frame.
925 * If the packets are already correctly interleaved the application should
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926 * call av_write_frame() instead as it is slightly faster. It is also important
927 * to keep in mind that completely non-interleaved input will need huge amounts
928 * of memory to interleave with this, so it is preferable to interleave at the
929 * demuxer level.
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930 *
931 * @param s media file handle
932 * @param pkt the packet, which contains the stream_index, buf/buf_size, dts/pts, ...
933 * @return < 0 if error, = 0 if OK, 1 if end of stream wanted.
934 */
3c895fc0 935int av_interleaved_write_frame(AVFormatContext *s, AVPacket *pkt);
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936
937/**
938 * Interleave a packet per DTS in an output media file.
939 *
940 * Packets with pkt->destruct == av_destruct_packet will be freed inside this function,
941 * so they cannot be used after it, note calling av_free_packet() on them is still safe.
942 *
943 * @param s media file handle
944 * @param out the interleaved packet will be output here
945 * @param in the input packet
946 * @param flush 1 if no further packets are available as input and all
947 * remaining packets should be output
948 * @return 1 if a packet was output, 0 if no packet could be output,
d9526386 949 * < 0 if an error occurred
3217cb42 950 */
f21c0b4c 951int av_interleave_packet_per_dts(AVFormatContext *s, AVPacket *out, AVPacket *pkt, int flush);
e928649b 952
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953/**
954 * @brief Write the stream trailer to an output media file and
955 * free the file private data.
956 *
957 * @param s media file handle
958 * @return 0 if OK. AVERROR_xxx if error.
959 */
b9a281db 960int av_write_trailer(AVFormatContext *s);
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961
962void dump_format(AVFormatContext *ic,
115329f1 963 int index,
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964 const char *url,
965 int is_output);
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966
967/**
968 * parses width and height out of string str.
26ef3220 969 * @deprecated Use av_parse_video_frame_size instead.
3217cb42 970 */
26ef3220 971attribute_deprecated int parse_image_size(int *width_ptr, int *height_ptr, const char *str);
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972
973/**
974 * Converts frame rate from string to a fraction.
26ef3220 975 * @deprecated Use av_parse_video_frame_rate instead.
3217cb42 976 */
26ef3220 977attribute_deprecated int parse_frame_rate(int *frame_rate, int *frame_rate_base, const char *arg);
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978
979/**
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980 * Parses \p datestr and returns a corresponding number of microseconds.
981 * @param datestr String representing a date or a duration.
982 * - If a date the syntax is:
3217cb42 983 * @code
3217cb42 984 * [{YYYY-MM-DD|YYYYMMDD}]{T| }{HH[:MM[:SS[.m...]]][Z]|HH[MM[SS[.m...]]][Z]}
3217cb42 985 * @endcode
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986 * Time is localtime unless Z is appended, in which case it is
987 * interpreted as UTC.
988 * If the year-month-day part isn't specified it takes the current
989 * year-month-day.
990 * Returns the number of microseconds since 1st of January, 1970 up to
991 * the time of the parsed date or INT64_MIN if \p datestr cannot be
992 * successfully parsed.
993 * - If a duration the syntax is:
994 * @code
995 * [-]HH[:MM[:SS[.m...]]]
996 * [-]S+[.m...]
997 * @endcode
998 * Returns the number of microseconds contained in a time interval
999 * with the specified duration or INT64_MIN if \p datestr cannot be
7338d368 1000 * successfully parsed.
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1001 * @param duration Flag which tells how to interpret \p datestr, if
1002 * not zero \p datestr is interpreted as a duration, otherwise as a
1003 * date.
3217cb42 1004 */
0c1a9eda 1005int64_t parse_date(const char *datestr, int duration);
de6d9b64 1006
0c1a9eda 1007int64_t av_gettime(void);
94988531 1008
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1009/* ffm specific for ffserver */
1010#define FFM_PACKET_SIZE 4096
1011offset_t ffm_read_write_index(int fd);
1012void ffm_write_write_index(int fd, offset_t pos);
1013void ffm_set_write_index(AVFormatContext *s, offset_t pos, offset_t file_size);
1014
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1015/**
1016 * Attempts to find a specific tag in a URL.
1017 *
1018 * syntax: '?tag1=val1&tag2=val2...'. Little URL decoding is done.
1019 * Return 1 if found.
1020 */
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1021int find_info_tag(char *arg, int arg_size, const char *tag1, const char *info);
1022
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1023/**
1024 * Returns in 'buf' the path with '%d' replaced by number.
1025
1026 * Also handles the '%0nd' format where 'n' is the total number
1027 * of digits and '%%'.
1028 *
1029 * @param buf destination buffer
1030 * @param buf_size destination buffer size
1031 * @param path numbered sequence string
8ea0e802 1032 * @param number frame number
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1033 * @return 0 if OK, -1 if format error.
1034 */
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1035int av_get_frame_filename(char *buf, int buf_size,
1036 const char *path, int number);
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1037
1038/**
1039 * Check whether filename actually is a numbered sequence generator.
1040 *
1041 * @param filename possible numbered sequence string
1042 * @return 1 if a valid numbered sequence string, 0 otherwise.
1043 */
5c07cf53 1044int av_filename_number_test(const char *filename);
96baaa6a 1045
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1046/**
1047 * Generate an SDP for an RTP session.
1048 *
1049 * @param ac array of AVFormatContexts describing the RTP streams. If the
1050 * array is composed by only one context, such context can contain
1051 * multiple AVStreams (one AVStream per RTP stream). Otherwise,
1052 * all the contexts in the array (an AVCodecContext per RTP stream)
1053 * must contain only one AVStream
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1054 * @param n_files number of AVCodecContexts contained in ac
1055 * @param buff buffer where the SDP will be stored (must be allocated by
1056 * the caller
1057 * @param size the size of the buffer
1058 * @return 0 if OK. AVERROR_xxx if error.
c5388c07 1059 */
8767b80f 1060int avf_sdp_create(AVFormatContext *ac[], int n_files, char *buff, int size);
c5388c07 1061
fb025625 1062#ifdef HAVE_AV_CONFIG_H
f71869a4 1063
903a2e86 1064void ff_dynarray_add(unsigned long **tab_ptr, int *nb_ptr, unsigned long elem);
39f472c3 1065
e4e70d2e 1066#ifdef __GNUC__
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1067#define dynarray_add(tab, nb_ptr, elem)\
1068do {\
1069 typeof(tab) _tab = (tab);\
1070 typeof(elem) _elem = (elem);\
1071 (void)sizeof(**_tab == _elem); /* check that types are compatible */\
903a2e86 1072 ff_dynarray_add((unsigned long **)_tab, nb_ptr, (unsigned long)_elem);\
39f472c3 1073} while(0)
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1074#else
1075#define dynarray_add(tab, nb_ptr, elem)\
1076do {\
903a2e86 1077 ff_dynarray_add((unsigned long **)(tab), nb_ptr, (unsigned long)(elem));\
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1078} while(0)
1079#endif
39f472c3 1080
f71869a4 1081time_t mktimegm(struct tm *tm);
0c9fc6e1 1082struct tm *brktimegm(time_t secs, struct tm *tm);
115329f1 1083const char *small_strptime(const char *p, const char *fmt,
f71869a4
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1084 struct tm *dt);
1085
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1086struct in_addr;
1087int resolve_host(struct in_addr *sin_addr, const char *hostname);
1088
1089void url_split(char *proto, int proto_size,
6ba5cbc6 1090 char *authorization, int authorization_size,
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1091 char *hostname, int hostname_size,
1092 int *port_ptr,
1093 char *path, int path_size,
1094 const char *url);
1095
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1096int match_ext(const char *filename, const char *extensions);
1097
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1098#endif /* HAVE_AV_CONFIG_H */
1099
5b21bdab 1100#endif /* FFMPEG_AVFORMAT_H */