command_streams are type data not unknown.
[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
5b8cc860 25#define LIBAVFORMAT_VERSION_MINOR 17
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
f71869a4 38#include <time.h>
67070e4f 39#include <stdio.h> /* FILE */
76a448ed 40#include "libavcodec/avcodec.h"
de6d9b64 41
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42#include "avio.h"
43
44/* packet functions */
45
46typedef struct AVPacket {
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47 /**
48 * Presentation time stamp in time_base units.
49 * This is the time at which the decompressed packet will be presented
50 * to the user.
51 * Can be AV_NOPTS_VALUE if it is not stored in the file.
52 * pts MUST be larger or equal to dts as presentation can not happen before
53 * decompression, unless one wants to view hex dumps. Some formats misuse
54 * the terms dts and pts/cts to mean something different, these timestamps
55 * must be converted to true pts/dts before they are stored in AVPacket.
56 */
57 int64_t pts;
58 /**
59 * Decompression time stamp in time_base units.
60 * This is the time at which the packet is decompressed.
61 * Can be AV_NOPTS_VALUE if it is not stored in the file.
62 */
63 int64_t dts;
0c1a9eda 64 uint8_t *data;
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65 int size;
66 int stream_index;
67 int flags;
2692067a 68 int duration; ///< presentation duration in time_base units (0 if not available)
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69 void (*destruct)(struct AVPacket *);
70 void *priv;
2692067a 71 int64_t pos; ///< byte position in stream, -1 if unknown
115329f1 72} AVPacket;
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73#define PKT_FLAG_KEY 0x0001
74
63dd1377 75void av_destruct_packet_nofree(AVPacket *pkt);
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76
77/**
78 * Default packet destructor.
79 */
90ad92b3 80void av_destruct_packet(AVPacket *pkt);
63dd1377 81
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82/**
83 * Initialize optional fields of a packet to default values.
84 *
85 * @param pkt packet
86 */
659596f0 87void av_init_packet(AVPacket *pkt);
de6d9b64 88
3217cb42 89/**
ac3967c1 90 * Allocate the payload of a packet and initialize its fields to default values.
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91 *
92 * @param pkt packet
93 * @param size wanted payload size
94 * @return 0 if OK. AVERROR_xxx otherwise.
95 */
de6d9b64 96int av_new_packet(AVPacket *pkt, int size);
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97
98/**
ac3967c1 99 * Allocate and read the payload of a packet and initialize its fields to default values.
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100 *
101 * @param pkt packet
102 * @param size wanted payload size
103 * @return >0 (read size) if OK. AVERROR_xxx otherwise.
104 */
2692067a 105int av_get_packet(ByteIOContext *s, AVPacket *pkt, int size);
3217cb42 106
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107/**
108 * @warning This is a hack - the packet memory allocation stuff is broken. The
109 * packet is allocated if it was not really allocated
110 */
fb2758c8 111int av_dup_packet(AVPacket *pkt);
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112
113/**
114 * Free a packet
115 *
116 * @param pkt packet to free
117 */
118static inline void av_free_packet(AVPacket *pkt)
119{
342474ab 120 if (pkt && pkt->destruct) {
bb270c08 121 pkt->destruct(pkt);
342474ab 122 }
6fa5a56c 123}
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124
125/*************************************************/
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126/* fractional numbers for exact pts handling */
127
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128/**
129 * the exact value of the fractional number is: 'val + num / den'.
130 * num is assumed to be such as 0 <= num < den
131 * @deprecated Use AVRational instead
132*/
916c80e9 133typedef struct AVFrac {
115329f1 134 int64_t val, num, den;
955ab9a4 135} AVFrac attribute_deprecated;
916c80e9 136
916c80e9 137/*************************************************/
b9a281db 138/* input/output formats */
de6d9b64 139
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140struct AVCodecTag;
141
de6d9b64 142struct AVFormatContext;
b9a281db 143
43d414ba 144/** this structure contains the data a format has to probe a file */
b9a281db 145typedef struct AVProbeData {
5c91a675 146 const char *filename;
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147 unsigned char *buf;
148 int buf_size;
149} AVProbeData;
150
0288a747 151#define AVPROBE_SCORE_MAX 100 ///< max score, half of that is used for file extension based detection
87e87886 152#define AVPROBE_PADDING_SIZE 32 ///< extra allocated bytes at the end of the probe buffer
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153
154typedef struct AVFormatParameters {
c0df9d75 155 AVRational time_base;
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156 int sample_rate;
157 int channels;
158 int width;
159 int height;
4606ac8d 160 enum PixelFormat pix_fmt;
43d414ba 161 int channel; /**< used to select dv channel */
43d414ba 162 const char *standard; /**< tv standard, NTSC, PAL, SECAM */
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163 unsigned int mpeg2ts_raw:1; /**< force raw MPEG2 transport stream output, if possible */
164 unsigned int mpeg2ts_compute_pcr:1; /**< compute exact PCR for each transport
165 stream packet (only meaningful if
166 mpeg2ts_raw is TRUE) */
167 unsigned int initial_pause:1; /**< do not begin to play the stream
168 immediately (RTSP only) */
169 unsigned int prealloced_context:1;
71957315 170#if LIBAVFORMAT_VERSION_INT < (53<<16)
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171 enum CodecID video_codec_id;
172 enum CodecID audio_codec_id;
71957315 173#endif
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174} AVFormatParameters;
175
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176//! demuxer will use url_fopen, no opened file should be provided by the caller
177#define AVFMT_NOFILE 0x0001
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178#define AVFMT_NEEDNUMBER 0x0002 /**< needs '%d' in filename */
179#define AVFMT_SHOW_IDS 0x0008 /**< show format stream IDs numbers */
180#define AVFMT_RAWPICTURE 0x0020 /**< format wants AVPicture structure for
fb025625 181 raw picture data */
43d414ba 182#define AVFMT_GLOBALHEADER 0x0040 /**< format wants global header */
755bfeab 183#define AVFMT_NOTIMESTAMPS 0x0080 /**< format does not need / have any timestamps */
43d414ba 184#define AVFMT_GENERIC_INDEX 0x0100 /**< use generic index building code */
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185
186typedef struct AVOutputFormat {
de6d9b64 187 const char *name;
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188 /**
189 * Descriptive name for the format, meant to be more human-readable
190 * than \p name. You \e should use the NULL_IF_CONFIG_SMALL() macro
191 * to define it.
192 */
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193 const char *long_name;
194 const char *mime_type;
cf29452b 195 const char *extensions; /**< comma separated filename extensions */
43d414ba 196 /** size of private data so that it can be allocated in the wrapper */
b9a281db 197 int priv_data_size;
de6d9b64 198 /* output support */
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199 enum CodecID audio_codec; /**< default audio codec */
200 enum CodecID video_codec; /**< default video codec */
de6d9b64 201 int (*write_header)(struct AVFormatContext *);
e928649b 202 int (*write_packet)(struct AVFormatContext *, AVPacket *pkt);
de6d9b64 203 int (*write_trailer)(struct AVFormatContext *);
43d414ba 204 /** can use flags: AVFMT_NOFILE, AVFMT_NEEDNUMBER, AVFMT_GLOBALHEADER */
b9a281db 205 int flags;
43d414ba 206 /** currently only used to set pixel format if not YUV420P */
290c5fa6 207 int (*set_parameters)(struct AVFormatContext *, AVFormatParameters *);
fe2d6fe2 208 int (*interleave_packet)(struct AVFormatContext *, AVPacket *out, AVPacket *in, int flush);
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209
210 /**
211 * list of supported codec_id-codec_tag pairs, ordered by "better choice first"
212 * the arrays are all CODEC_ID_NONE terminated
213 */
6c77805f 214 const struct AVCodecTag **codec_tag;
7caf0cc6 215
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216 enum CodecID subtitle_codec; /**< default subtitle codec */
217
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218 /* private fields */
219 struct AVOutputFormat *next;
220} AVOutputFormat;
de6d9b64 221
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222typedef struct AVInputFormat {
223 const char *name;
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224 /**
225 * Descriptive name for the format, meant to be more human-readable
226 * than \p name. You \e should use the NULL_IF_CONFIG_SMALL() macro
227 * to define it.
228 */
b9a281db 229 const char *long_name;
43d414ba 230 /** size of private data so that it can be allocated in the wrapper */
b9a281db 231 int priv_data_size;
65d7d68b 232 /**
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233 * Tell if a given file has a chance of being parsed by this format.
234 * The buffer provided is guaranteed to be AVPROBE_PADDING_SIZE bytes
235 * big so you do not have to check for that unless you need more.
65d7d68b 236 */
b9a281db 237 int (*read_probe)(AVProbeData *);
43d414ba 238 /** read the format header and initialize the AVFormatContext
de6d9b64 239 structure. Return 0 if OK. 'ap' if non NULL contains
e42dba48 240 additional paramters. Only used in raw format right
b9a281db 241 now. 'av_new_stream' should be called to create new streams. */
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242 int (*read_header)(struct AVFormatContext *,
243 AVFormatParameters *ap);
43d414ba 244 /** read one packet and put it in 'pkt'. pts and flags are also
b9a281db 245 set. 'av_new_stream' can be called only if the flag
da24c5e3 246 AVFMTCTX_NOHEADER is used. */
de6d9b64 247 int (*read_packet)(struct AVFormatContext *, AVPacket *pkt);
43d414ba 248 /** close the stream. The AVFormatContext and AVStreams are not
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249 freed by this function */
250 int (*read_close)(struct AVFormatContext *);
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251 /**
252 * seek to a given timestamp relative to the frames in
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253 * stream component stream_index
254 * @param stream_index must not be -1
115329f1 255 * @param flags selects which direction should be preferred if no exact
3ba1438d 256 * match is available
05ce0f11 257 * @return >= 0 on success (but not necessarily the new offset)
3ba1438d 258 */
115329f1 259 int (*read_seek)(struct AVFormatContext *,
3ba1438d 260 int stream_index, int64_t timestamp, int flags);
8d14a25c 261 /**
2576a9ec 262 * gets the next timestamp in stream[stream_index].time_base units.
d9526386 263 * @return the timestamp or AV_NOPTS_VALUE if an error occurred
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264 */
265 int64_t (*read_timestamp)(struct AVFormatContext *s, int stream_index,
266 int64_t *pos, int64_t pos_limit);
43d414ba 267 /** can use flags: AVFMT_NOFILE, AVFMT_NEEDNUMBER */
de6d9b64 268 int flags;
43d414ba 269 /** if extensions are defined, then no probe is done. You should
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270 usually not use extension format guessing because it is not
271 reliable enough */
272 const char *extensions;
43d414ba 273 /** general purpose read only value that the format can use */
b9a281db 274 int value;
fb2758c8 275
43d414ba 276 /** start/resume playing - only meaningful if using a network based format
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277 (RTSP) */
278 int (*read_play)(struct AVFormatContext *);
279
43d414ba 280 /** pause playing - only meaningful if using a network based format
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281 (RTSP) */
282 int (*read_pause)(struct AVFormatContext *);
283
6c77805f 284 const struct AVCodecTag **codec_tag;
7caf0cc6 285
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286 /* private fields */
287 struct AVInputFormat *next;
288} AVInputFormat;
de6d9b64 289
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290enum AVStreamParseType {
291 AVSTREAM_PARSE_NONE,
292 AVSTREAM_PARSE_FULL, /**< full parsing and repack */
293 AVSTREAM_PARSE_HEADERS, /**< only parse headers, don't repack */
294 AVSTREAM_PARSE_TIMESTAMPS, /**< full parsing and interpolation of timestamps for frames not starting on packet boundary */
295};
296
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297typedef struct AVIndexEntry {
298 int64_t pos;
299 int64_t timestamp;
300#define AVINDEX_KEYFRAME 0x0001
30a43f2d 301 int flags:2;
90b5b51e 302 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 303 int min_distance; /**< min distance between this and the previous keyframe, used to avoid unneeded searching */
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304} AVIndexEntry;
305
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306#define AV_DISPOSITION_DEFAULT 0x0001
307#define AV_DISPOSITION_DUB 0x0002
308#define AV_DISPOSITION_ORIGINAL 0x0004
309#define AV_DISPOSITION_COMMENT 0x0008
310#define AV_DISPOSITION_LYRICS 0x0010
311#define AV_DISPOSITION_KARAOKE 0x0020
312
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313/**
314 * Stream structure.
315 * New fields can be added to the end with minor version bumps.
8bfb108b 316 * Removal, reordering and changes to existing fields require a major
ba66ae94 317 * version bump.
8bfb108b 318 * sizeof(AVStream) must not be used outside libav*.
ba66ae94 319 */
de6d9b64 320typedef struct AVStream {
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321 int index; /**< stream index in AVFormatContext */
322 int id; /**< format specific stream id */
323 AVCodecContext *codec; /**< codec context */
b4b87d48 324 /**
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325 * Real base frame rate of the stream.
326 * This is the lowest frame rate with which all timestamps can be
864ff8c1 327 * represented accurately (it is the least common multiple of all
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328 * frame rates in the stream), Note, this value is just a guess!
329 * For example if the timebase is 1/90000 and all frames have either
330 * approximately 3600 or 1800 timer ticks then r_frame_rate will be 50/1.
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331 */
332 AVRational r_frame_rate;
de6d9b64 333 void *priv_data;
82583548 334
b9a281db 335 /* internal data used in av_find_stream_info() */
82583548 336 int64_t first_dts;
43d414ba 337 /** encoding: PTS generation when outputing stream */
a9fd2b19 338 struct AVFrac pts;
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339
340 /**
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341 * This is the fundamental unit of time (in seconds) in terms
342 * of which frame timestamps are represented. For fixed-fps content,
343 * timebase should be 1/frame rate and timestamp increments should be
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344 * identically 1.
345 */
9ee91c2f 346 AVRational time_base;
43d414ba 347 int pts_wrap_bits; /**< number of bits in pts (used for wrapping control) */
a48b7a6b 348 /* ffmpeg.c private use */
15786dc4 349 int stream_copy; /**< if set, just copy stream */
755bfeab 350 enum AVDiscard discard; ///< selects which packets can be discarded at will and do not need to be demuxed
b4aea108 351 //FIXME move stuff to a flags field?
43d414ba 352 /** quality, as it has been removed from AVCodecContext and put in AVVideoFrame
755bfeab 353 * MN: dunno if that is the right place for it */
115329f1 354 float quality;
6d96a9b9 355 /**
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356 * Decoding: pts of the first frame of the stream, in stream time base.
357 * Only set this if you are absolutely 100% sure that the value you set
358 * it to really is the pts of the first frame.
4854c253 359 * This may be undefined (AV_NOPTS_VALUE).
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360 * @note The ASF header does NOT contain a correct start_time the ASF
361 * demuxer must NOT set this.
6d96a9b9 362 */
115329f1 363 int64_t start_time;
e26381b6 364 /**
8bfb108b 365 * Decoding: duration of the stream, in stream time base.
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366 * If a source file does not specify a duration, but does specify
367 * a bitrate, this value will be estimates from bit rate and file size.
368 */
ee404803 369 int64_t duration;
fb2758c8 370
43d414ba 371 char language[4]; /** ISO 639 3-letter language code (empty string if undefined) */
09730260 372
fb2758c8 373 /* av_read_frame() support */
57004ff1 374 enum AVStreamParseType need_parsing;
fb2758c8 375 struct AVCodecParserContext *parser;
6ec87caa 376
fb2758c8 377 int64_t cur_dts;
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378 int last_IP_duration;
379 int64_t last_IP_pts;
fb2758c8 380 /* av_seek_frame() support */
43d414ba 381 AVIndexEntry *index_entries; /**< only used if the format does not
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382 support seeking natively */
383 int nb_index_entries;
191e8ca7 384 unsigned int index_entries_allocated_size;
115329f1 385
b4b87d48 386 int64_t nb_frames; ///< number of frames in this stream if known or 0
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387
388#define MAX_REORDER_DELAY 4
389 int64_t pts_buffer[MAX_REORDER_DELAY+1];
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390
391 char *filename; /**< source filename of the stream */
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392
393 int disposition; /**< AV_DISPOSITION_* bitfield */
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394} AVStream;
395
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396#define AV_PROGRAM_RUNNING 1
397
ba66ae94 398/**
ba66ae94 399 * New fields can be added to the end with minor version bumps.
8bfb108b 400 * Removal, reordering and changes to existing fields require a major
ba66ae94 401 * version bump.
8bfb108b 402 * sizeof(AVProgram) must not be used outside libav*.
ba66ae94 403 */
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404typedef struct AVProgram {
405 int id;
406 char *provider_name; ///< Network name for DVB streams
407 char *name; ///< Service name for DVB streams
408 int flags;
409 enum AVDiscard discard; ///< selects which program to discard and which to feed to the caller
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410 unsigned int *stream_index;
411 unsigned int nb_stream_indexes;
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412} AVProgram;
413
43d414ba 414#define AVFMTCTX_NOHEADER 0x0001 /**< signal that no header is present
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415 (streams are added dynamically) */
416
79d7836a 417typedef struct AVChapter {
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418 int id; ///< Unique id to identify the chapter
419 AVRational time_base; ///< Timebase in which the start/end timestamps are specified
8931e7b4 420 int64_t start, end; ///< chapter start/end time in time_base units
c2fb6be4 421 char *title; ///< chapter title
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422} AVChapter;
423
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424#define MAX_STREAMS 20
425
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426/**
427 * format I/O context.
428 * New fields can be added to the end with minor version bumps.
8bfb108b 429 * Removal, reordering and changes to existing fields require a major
252f17e2 430 * version bump.
8bfb108b 431 * sizeof(AVFormatContext) must not be used outside libav*.
252f17e2 432 */
de6d9b64 433typedef struct AVFormatContext {
43d414ba 434 const AVClass *av_class; /**< set by av_alloc_format_context */
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435 /* can only be iformat or oformat, not both at the same time */
436 struct AVInputFormat *iformat;
437 struct AVOutputFormat *oformat;
de6d9b64 438 void *priv_data;
899681cd 439 ByteIOContext *pb;
db69c2e5 440 unsigned int nb_streams;
de6d9b64 441 AVStream *streams[MAX_STREAMS];
43d414ba 442 char filename[1024]; /**< input or output filename */
de6d9b64 443 /* stream info */
4568325a 444 int64_t timestamp;
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445 char title[512];
446 char author[512];
447 char copyright[512];
448 char comment[512];
6a58e151 449 char album[512];
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450 int year; /**< ID3 year, 0 if none */
451 int track; /**< track number, 0 if none */
452 char genre[32]; /**< ID3 genre */
6a58e151 453
43d414ba 454 int ctx_flags; /**< format specific flags, see AVFMTCTX_xx */
916c80e9 455 /* private data for pts handling (do not modify directly) */
43d414ba 456 /** This buffer is only needed when packets were already buffered but
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457 not decoded, for example to get the codec parameters in mpeg
458 streams */
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459 struct AVPacketList *packet_buffer;
460
43d414ba 461 /** decoding: position of the first frame of the component, in
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462 AV_TIME_BASE fractional seconds. NEVER set this value directly:
463 it is deduced from the AVStream values. */
115329f1 464 int64_t start_time;
43d414ba 465 /** decoding: duration of the stream, in AV_TIME_BASE fractional
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466 seconds. NEVER set this value directly: it is deduced from the
467 AVStream values. */
468 int64_t duration;
43d414ba 469 /** decoding: total file size. 0 if unknown */
ee404803 470 int64_t file_size;
43d414ba 471 /** decoding: total stream bitrate in bit/s, 0 if not
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472 available. Never set it directly if the file_size and the
473 duration are known as ffmpeg can compute it automatically. */
474 int bit_rate;
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475
476 /* av_read_frame() support */
477 AVStream *cur_st;
478 const uint8_t *cur_ptr;
479 int cur_len;
480 AVPacket cur_pkt;
481
fb2758c8 482 /* av_seek_frame() support */
43d414ba 483 int64_t data_offset; /** offset of the first packet */
fb2758c8 484 int index_built;
115329f1 485
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486 int mux_rate;
487 int packet_size;
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488 int preload;
489 int max_delay;
8108551a 490
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491#define AVFMT_NOOUTPUTLOOP -1
492#define AVFMT_INFINITEOUTPUTLOOP 0
43d414ba 493 /** number of times to loop output in formats that support it */
8108551a 494 int loop_output;
115329f1 495
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496 int flags;
497#define AVFMT_FLAG_GENPTS 0x0001 ///< generate pts if missing even if it requires parsing future frames
2c00106c 498#define AVFMT_FLAG_IGNIDX 0x0002 ///< ignore index
bf09c2e2 499#define AVFMT_FLAG_NONBLOCK 0x0004 ///< do not block when reading packets from input
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500
501 int loop_input;
43d414ba 502 /** decoding: size of data to probe; encoding unused */
9e6c9470 503 unsigned int probesize;
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504
505 /**
506 * maximum duration in AV_TIME_BASE units over which the input should be analyzed in av_find_stream_info()
507 */
508 int max_analyze_duration;
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509
510 const uint8_t *key;
511 int keylen;
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512
513 unsigned int nb_programs;
514 AVProgram **programs;
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515
516 /**
517 * Forced video codec_id.
518 * demuxing: set by user
519 */
520 enum CodecID video_codec_id;
521 /**
522 * Forced audio codec_id.
523 * demuxing: set by user
524 */
525 enum CodecID audio_codec_id;
526 /**
527 * Forced subtitle codec_id.
528 * demuxing: set by user
529 */
530 enum CodecID subtitle_codec_id;
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531
532 /**
533 * Maximum amount of memory in bytes to use per stream for the index.
534 * If the needed index exceeds this size entries will be discarded as
535 * needed to maintain a smaller size. This can lead to slower or less
536 * accurate seeking (depends on demuxer).
537 * Demuxers for which a full in memory index is mandatory will ignore
538 * this.
539 * muxing : unused
540 * demuxing: set by user
541 */
542 unsigned int max_index_size;
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543
544 /**
ffa71b2b 545 * Maximum amount of memory in bytes to use for buffering frames
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546 * obtained from real-time capture devices.
547 */
548 unsigned int max_picture_buffer;
79d7836a 549
fbabf1e9 550 unsigned int nb_chapters;
79d7836a 551 AVChapter **chapters;
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552
553 /**
554 * Flags to enable debuging.
555 */
556 int debug;
557#define FF_FDEBUG_TS 0x0001
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558} AVFormatContext;
559
560typedef struct AVPacketList {
561 AVPacket pkt;
562 struct AVPacketList *next;
563} AVPacketList;
564
84be6e72 565#if LIBAVFORMAT_VERSION_INT < (53<<16)
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566extern AVInputFormat *first_iformat;
567extern AVOutputFormat *first_oformat;
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568#endif
569
570AVInputFormat *av_iformat_next(AVInputFormat *f);
571AVOutputFormat *av_oformat_next(AVOutputFormat *f);
de6d9b64 572
5b6d5596 573enum CodecID av_guess_image2_codec(const char *filename);
290c5fa6 574
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575/* XXX: use automatic init with either ELF sections or C file parser */
576/* modules */
de6d9b64 577
b9a281db 578/* utils.c */
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579void av_register_input_format(AVInputFormat *format);
580void av_register_output_format(AVOutputFormat *format);
115329f1 581AVOutputFormat *guess_stream_format(const char *short_name,
36ada60c 582 const char *filename, const char *mime_type);
115329f1 583AVOutputFormat *guess_format(const char *short_name,
b9a281db 584 const char *filename, const char *mime_type);
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585
586/**
587 * Guesses the codec id based upon muxer and filename.
588 */
115329f1 589enum CodecID av_guess_codec(AVOutputFormat *fmt, const char *short_name,
5b6d5596 590 const char *filename, const char *mime_type, enum CodecType type);
de6d9b64 591
3217cb42 592/**
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593 * Send a nice hexadecimal dump of a buffer to the specified file stream.
594 *
595 * @param f The file stream pointer where the dump should be sent to.
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596 * @param buf buffer
597 * @param size buffer size
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598 *
599 * @see av_hex_dump_log, av_pkt_dump, av_pkt_dump_log
3217cb42 600 */
fb2758c8 601void av_hex_dump(FILE *f, uint8_t *buf, int size);
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602
603/**
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604 * Send a nice hexadecimal dump of a buffer to the log.
605 *
606 * @param avcl A pointer to an arbitrary struct of which the first field is a
607 * pointer to an AVClass struct.
608 * @param level The importance level of the message, lower values signifying
609 * higher importance.
610 * @param buf buffer
611 * @param size buffer size
612 *
613 * @see av_hex_dump, av_pkt_dump, av_pkt_dump_log
614 */
615void av_hex_dump_log(void *avcl, int level, uint8_t *buf, int size);
616
617/**
618 * Send a nice dump of a packet to the specified file stream.
619 *
620 * @param f The file stream pointer where the dump should be sent to.
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621 * @param pkt packet to dump
622 * @param dump_payload true if the payload must be displayed too
623 */
fb2758c8 624void av_pkt_dump(FILE *f, AVPacket *pkt, int dump_payload);
de6d9b64 625
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626/**
627 * Send a nice dump of a packet to the log.
628 *
629 * @param avcl A pointer to an arbitrary struct of which the first field is a
630 * pointer to an AVClass struct.
631 * @param level The importance level of the message, lower values signifying
632 * higher importance.
633 * @param pkt packet to dump
634 * @param dump_payload true if the payload must be displayed too
635 */
636void av_pkt_dump_log(void *avcl, int level, AVPacket *pkt, int dump_payload);
637
94988531 638void av_register_all(void);
de6d9b64 639
43d414ba 640/** codec tag <-> codec id */
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641enum CodecID av_codec_get_id(const struct AVCodecTag **tags, unsigned int tag);
642unsigned int av_codec_get_tag(const struct AVCodecTag **tags, enum CodecID id);
7caf0cc6 643
b9a281db 644/* media file input */
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645
646/**
647 * finds AVInputFormat based on input format's short name.
648 */
b9a281db 649AVInputFormat *av_find_input_format(const char *short_name);
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650
651/**
652 * Guess file format.
653 *
654 * @param is_opened whether the file is already opened, determines whether
655 * demuxers with or without AVFMT_NOFILE are probed
656 */
94988531 657AVInputFormat *av_probe_input_format(AVProbeData *pd, int is_opened);
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658
659/**
660 * Allocates all the structures needed to read an input stream.
661 * This does not open the needed codecs for decoding the stream[s].
662 */
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663int av_open_input_stream(AVFormatContext **ic_ptr,
664 ByteIOContext *pb, const char *filename,
da24c5e3 665 AVInputFormat *fmt, AVFormatParameters *ap);
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666
667/**
864ff8c1 668 * Open a media file as input. The codecs are not opened. Only the file
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669 * header (if present) is read.
670 *
671 * @param ic_ptr the opened media file handle is put here
672 * @param filename filename to open.
673 * @param fmt if non NULL, force the file format to use
674 * @param buf_size optional buffer size (zero if default is OK)
e42dba48 675 * @param ap additional parameters needed when opening the file (NULL if default)
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676 * @return 0 if OK. AVERROR_xxx otherwise.
677 */
115329f1 678int av_open_input_file(AVFormatContext **ic_ptr, const char *filename,
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679 AVInputFormat *fmt,
680 int buf_size,
681 AVFormatParameters *ap);
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682/**
683 * Allocate an AVFormatContext.
5d81d641 684 * Can be freed with av_free() but do not forget to free everything you
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685 * explicitly allocated as well!
686 */
bc874dae 687AVFormatContext *av_alloc_format_context(void);
b9a281db 688
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689/**
690 * Read packets of a media file to get stream information. This
691 * is useful for file formats with no headers such as MPEG. This
692 * function also computes the real frame rate in case of mpeg2 repeat
693 * frame mode.
694 * The logical file position is not changed by this function;
695 * examined packets may be buffered for later processing.
696 *
697 * @param ic media file handle
698 * @return >=0 if OK. AVERROR_xxx if error.
4e8988a3 699 * @todo Let user decide somehow what information is needed so we do not waste time getting stuff the user does not need.
3217cb42 700 */
b9a281db 701int av_find_stream_info(AVFormatContext *ic);
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702
703/**
704 * Read a transport packet from a media file.
705 *
864ff8c1 706 * This function is obsolete and should never be used.
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707 * Use av_read_frame() instead.
708 *
709 * @param s media file handle
710 * @param pkt is filled
711 * @return 0 if OK. AVERROR_xxx if error.
712 */
de6d9b64 713int av_read_packet(AVFormatContext *s, AVPacket *pkt);
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714
715/**
716 * Return the next frame of a stream.
717 *
718 * The returned packet is valid
719 * until the next av_read_frame() or until av_close_input_file() and
720 * must be freed with av_free_packet. For video, the packet contains
721 * exactly one frame. For audio, it contains an integer number of
722 * frames if each frame has a known fixed size (e.g. PCM or ADPCM
723 * data). If the audio frames have a variable size (e.g. MPEG audio),
724 * then it contains one frame.
725 *
726 * pkt->pts, pkt->dts and pkt->duration are always set to correct
a050f802 727 * values in AVStream.timebase units (and guessed if the format cannot
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728 * provided them). pkt->pts can be AV_NOPTS_VALUE if the video format
729 * has B frames, so it is better to rely on pkt->dts if you do not
730 * decompress the payload.
731 *
732 * @return 0 if OK, < 0 if error or end of file.
733 */
fb2758c8 734int av_read_frame(AVFormatContext *s, AVPacket *pkt);
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735
736/**
737 * Seek to the key frame at timestamp.
738 * 'timestamp' in 'stream_index'.
739 * @param stream_index If stream_index is (-1), a default
740 * stream is selected, and timestamp is automatically converted
741 * from AV_TIME_BASE units to the stream specific time_base.
742 * @param timestamp timestamp in AVStream.time_base units
743 * or if there is no stream specified then in AV_TIME_BASE units
744 * @param flags flags which select direction and seeking mode
745 * @return >= 0 on success
746 */
3ba1438d 747int av_seek_frame(AVFormatContext *s, int stream_index, int64_t timestamp, int flags);
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748
749/**
750 * start playing a network based stream (e.g. RTSP stream) at the
751 * current position
752 */
fb2758c8 753int av_read_play(AVFormatContext *s);
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754
755/**
756 * Pause a network based stream (e.g. RTSP stream).
757 *
758 * Use av_read_play() to resume it.
759 */
fb2758c8 760int av_read_pause(AVFormatContext *s);
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761
762/**
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763 * Free a AVFormatContext allocated by av_open_input_stream.
764 * @param s context to free
765 */
766void av_close_input_stream(AVFormatContext *s);
767
768/**
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769 * Close a media file (but not its codecs).
770 *
771 * @param s media file handle
772 */
de6d9b64 773void av_close_input_file(AVFormatContext *s);
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774
775/**
776 * Add a new stream to a media file.
777 *
778 * Can only be called in the read_header() function. If the flag
779 * AVFMTCTX_NOHEADER is in the format context, then new streams
780 * can be added in read_packet too.
781 *
782 * @param s media file handle
783 * @param id file format dependent stream id
784 */
b9a281db 785AVStream *av_new_stream(AVFormatContext *s, int id);
15afa396 786AVProgram *av_new_program(AVFormatContext *s, int id);
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787
788/**
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789 * Add a new chapter.
790 * This function is NOT part of the public API
791 * and should be ONLY used by demuxers.
792 *
793 * @param s media file handle
7a2a3e8e 794 * @param id unique id for this chapter
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795 * @param start chapter start time in time_base units
796 * @param end chapter end time in time_base units
79d7836a 797 * @param title chapter title
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798 *
799 * @return AVChapter or NULL if error.
79d7836a 800 */
abd2256d 801AVChapter *ff_new_chapter(AVFormatContext *s, int id, AVRational time_base, int64_t start, int64_t end, const char *title);
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802
803/**
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804 * Set the pts for a given stream.
805 *
806 * @param s stream
807 * @param pts_wrap_bits number of bits effectively used by the pts
808 * (used for wrap control, 33 is the value for MPEG)
809 * @param pts_num numerator to convert to seconds (MPEG: 1)
810 * @param pts_den denominator to convert to seconds (MPEG: 90000)
811 */
9ee91c2f 812void av_set_pts_info(AVStream *s, int pts_wrap_bits,
916c80e9 813 int pts_num, int pts_den);
de6d9b64 814
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815#define AVSEEK_FLAG_BACKWARD 1 ///< seek backward
816#define AVSEEK_FLAG_BYTE 2 ///< seeking based on position in bytes
27a5fe5f 817#define AVSEEK_FLAG_ANY 4 ///< seek to any frame, even non keyframes
3ba1438d 818
b754978a 819int av_find_default_stream_index(AVFormatContext *s);
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820
821/**
822 * Gets the index for a specific timestamp.
823 * @param flags if AVSEEK_FLAG_BACKWARD then the returned index will correspond to
824 * the timestamp which is <= the requested one, if backward is 0
825 * then it will be >=
826 * if AVSEEK_FLAG_ANY seek to any frame, only keyframes otherwise
827 * @return < 0 if no such timestamp could be found
828 */
dc56fc38 829int av_index_search_timestamp(AVStream *st, int64_t timestamp, int flags);
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830
831/**
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832 * Ensures the index uses less memory than the maximum specified in
833 * AVFormatContext.max_index_size, by discarding entries if it grows
834 * too large.
835 * This function is not part of the public API and should only be called
836 * by demuxers.
837 */
838void ff_reduce_index(AVFormatContext *s, int stream_index);
839
840/**
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841 * Add a index entry into a sorted list updateing if it is already there.
842 *
843 * @param timestamp timestamp in the timebase of the given stream
844 */
3e9245a9 845int av_add_index_entry(AVStream *st,
30a43f2d 846 int64_t pos, int64_t timestamp, int size, int distance, int flags);
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847
848/**
849 * Does a binary search using av_index_search_timestamp() and AVCodec.read_timestamp().
755bfeab 850 * This is not supposed to be called directly by a user application, but by demuxers.
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851 * @param target_ts target timestamp in the time base of the given stream
852 * @param stream_index stream number
853 */
3ba1438d 854int av_seek_frame_binary(AVFormatContext *s, int stream_index, int64_t target_ts, int flags);
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855
856/**
857 * Updates cur_dts of all streams based on given timestamp and AVStream.
858 *
859 * Stream ref_st unchanged, others set cur_dts in their native timebase
755bfeab 860 * only needed for timestamp wrapping or if (dts not set and pts!=dts).
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861 * @param timestamp new dts expressed in time_base of param ref_st
862 * @param ref_st reference stream giving time_base of param timestamp
863 */
22ffac70 864void av_update_cur_dts(AVFormatContext *s, AVStream *ref_st, int64_t timestamp);
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865
866/**
867 * Does a binary search using read_timestamp().
755bfeab 868 * This is not supposed to be called directly by a user application, but by demuxers.
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869 * @param target_ts target timestamp in the time base of the given stream
870 * @param stream_index stream number
871 */
89ddd2a9 872int64_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 873
43d414ba 874/** media file output */
290c5fa6 875int av_set_parameters(AVFormatContext *s, AVFormatParameters *ap);
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876
877/**
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878 * Allocate the stream private data and write the stream header to an
879 * output media file.
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880 *
881 * @param s media file handle
882 * @return 0 if OK. AVERROR_xxx if error.
883 */
b9a281db 884int av_write_header(AVFormatContext *s);
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885
886/**
887 * Write a packet to an output media file.
888 *
889 * The packet shall contain one audio or video frame.
890 * The packet must be correctly interleaved according to the container specification,
891 * if not then av_interleaved_write_frame must be used
892 *
893 * @param s media file handle
894 * @param pkt the packet, which contains the stream_index, buf/buf_size, dts/pts, ...
895 * @return < 0 if error, = 0 if OK, 1 if end of stream wanted.
896 */
e928649b 897int av_write_frame(AVFormatContext *s, AVPacket *pkt);
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898
899/**
900 * Writes a packet to an output media file ensuring correct interleaving.
901 *
902 * The packet must contain one audio or video frame.
903 * If the packets are already correctly interleaved the application should
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904 * call av_write_frame() instead as it is slightly faster. It is also important
905 * to keep in mind that completely non-interleaved input will need huge amounts
906 * of memory to interleave with this, so it is preferable to interleave at the
907 * demuxer level.
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908 *
909 * @param s media file handle
910 * @param pkt the packet, which contains the stream_index, buf/buf_size, dts/pts, ...
911 * @return < 0 if error, = 0 if OK, 1 if end of stream wanted.
912 */
3c895fc0 913int av_interleaved_write_frame(AVFormatContext *s, AVPacket *pkt);
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914
915/**
916 * Interleave a packet per DTS in an output media file.
917 *
918 * Packets with pkt->destruct == av_destruct_packet will be freed inside this function,
919 * so they cannot be used after it, note calling av_free_packet() on them is still safe.
920 *
921 * @param s media file handle
922 * @param out the interleaved packet will be output here
923 * @param in the input packet
924 * @param flush 1 if no further packets are available as input and all
925 * remaining packets should be output
926 * @return 1 if a packet was output, 0 if no packet could be output,
d9526386 927 * < 0 if an error occurred
3217cb42 928 */
f21c0b4c 929int av_interleave_packet_per_dts(AVFormatContext *s, AVPacket *out, AVPacket *pkt, int flush);
e928649b 930
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931/**
932 * @brief Write the stream trailer to an output media file and
933 * free the file private data.
934 *
935 * @param s media file handle
936 * @return 0 if OK. AVERROR_xxx if error.
937 */
b9a281db 938int av_write_trailer(AVFormatContext *s);
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939
940void dump_format(AVFormatContext *ic,
115329f1 941 int index,
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942 const char *url,
943 int is_output);
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944
945/**
946 * parses width and height out of string str.
26ef3220 947 * @deprecated Use av_parse_video_frame_size instead.
3217cb42 948 */
26ef3220 949attribute_deprecated int parse_image_size(int *width_ptr, int *height_ptr, const char *str);
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950
951/**
952 * Converts frame rate from string to a fraction.
26ef3220 953 * @deprecated Use av_parse_video_frame_rate instead.
3217cb42 954 */
26ef3220 955attribute_deprecated int parse_frame_rate(int *frame_rate, int *frame_rate_base, const char *arg);
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956
957/**
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958 * Parses \p datestr and returns a corresponding number of microseconds.
959 * @param datestr String representing a date or a duration.
960 * - If a date the syntax is:
3217cb42 961 * @code
3217cb42 962 * [{YYYY-MM-DD|YYYYMMDD}]{T| }{HH[:MM[:SS[.m...]]][Z]|HH[MM[SS[.m...]]][Z]}
3217cb42 963 * @endcode
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964 * Time is localtime unless Z is appended, in which case it is
965 * interpreted as UTC.
966 * If the year-month-day part isn't specified it takes the current
967 * year-month-day.
968 * Returns the number of microseconds since 1st of January, 1970 up to
969 * the time of the parsed date or INT64_MIN if \p datestr cannot be
970 * successfully parsed.
971 * - If a duration the syntax is:
972 * @code
973 * [-]HH[:MM[:SS[.m...]]]
974 * [-]S+[.m...]
975 * @endcode
976 * Returns the number of microseconds contained in a time interval
977 * with the specified duration or INT64_MIN if \p datestr cannot be
7338d368 978 * successfully parsed.
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979 * @param duration Flag which tells how to interpret \p datestr, if
980 * not zero \p datestr is interpreted as a duration, otherwise as a
981 * date.
3217cb42 982 */
0c1a9eda 983int64_t parse_date(const char *datestr, int duration);
de6d9b64 984
0c1a9eda 985int64_t av_gettime(void);
94988531 986
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987/* ffm specific for ffserver */
988#define FFM_PACKET_SIZE 4096
989offset_t ffm_read_write_index(int fd);
990void ffm_write_write_index(int fd, offset_t pos);
991void ffm_set_write_index(AVFormatContext *s, offset_t pos, offset_t file_size);
992
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993/**
994 * Attempts to find a specific tag in a URL.
995 *
996 * syntax: '?tag1=val1&tag2=val2...'. Little URL decoding is done.
997 * Return 1 if found.
998 */
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999int find_info_tag(char *arg, int arg_size, const char *tag1, const char *info);
1000
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1001/**
1002 * Returns in 'buf' the path with '%d' replaced by number.
1003
1004 * Also handles the '%0nd' format where 'n' is the total number
1005 * of digits and '%%'.
1006 *
1007 * @param buf destination buffer
1008 * @param buf_size destination buffer size
1009 * @param path numbered sequence string
8ea0e802 1010 * @param number frame number
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1011 * @return 0 if OK, -1 if format error.
1012 */
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1013int av_get_frame_filename(char *buf, int buf_size,
1014 const char *path, int number);
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1015
1016/**
1017 * Check whether filename actually is a numbered sequence generator.
1018 *
1019 * @param filename possible numbered sequence string
1020 * @return 1 if a valid numbered sequence string, 0 otherwise.
1021 */
5c07cf53 1022int av_filename_number_test(const char *filename);
96baaa6a 1023
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1024/**
1025 * Generate an SDP for an RTP session.
1026 *
1027 * @param ac array of AVFormatContexts describing the RTP streams. If the
1028 * array is composed by only one context, such context can contain
1029 * multiple AVStreams (one AVStream per RTP stream). Otherwise,
1030 * all the contexts in the array (an AVCodecContext per RTP stream)
1031 * must contain only one AVStream
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1032 * @param n_files number of AVCodecContexts contained in ac
1033 * @param buff buffer where the SDP will be stored (must be allocated by
1034 * the caller
1035 * @param size the size of the buffer
1036 * @return 0 if OK. AVERROR_xxx if error.
c5388c07 1037 */
8767b80f 1038int avf_sdp_create(AVFormatContext *ac[], int n_files, char *buff, int size);
c5388c07 1039
fb025625 1040#ifdef HAVE_AV_CONFIG_H
f71869a4 1041
903a2e86 1042void ff_dynarray_add(unsigned long **tab_ptr, int *nb_ptr, unsigned long elem);
39f472c3 1043
e4e70d2e 1044#ifdef __GNUC__
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1045#define dynarray_add(tab, nb_ptr, elem)\
1046do {\
1047 typeof(tab) _tab = (tab);\
1048 typeof(elem) _elem = (elem);\
1049 (void)sizeof(**_tab == _elem); /* check that types are compatible */\
903a2e86 1050 ff_dynarray_add((unsigned long **)_tab, nb_ptr, (unsigned long)_elem);\
39f472c3 1051} while(0)
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1052#else
1053#define dynarray_add(tab, nb_ptr, elem)\
1054do {\
903a2e86 1055 ff_dynarray_add((unsigned long **)(tab), nb_ptr, (unsigned long)(elem));\
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1056} while(0)
1057#endif
39f472c3 1058
f71869a4 1059time_t mktimegm(struct tm *tm);
0c9fc6e1 1060struct tm *brktimegm(time_t secs, struct tm *tm);
115329f1 1061const char *small_strptime(const char *p, const char *fmt,
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1062 struct tm *dt);
1063
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1064struct in_addr;
1065int resolve_host(struct in_addr *sin_addr, const char *hostname);
1066
1067void url_split(char *proto, int proto_size,
6ba5cbc6 1068 char *authorization, int authorization_size,
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1069 char *hostname, int hostname_size,
1070 int *port_ptr,
1071 char *path, int path_size,
1072 const char *url);
1073
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FB
1074int match_ext(const char *filename, const char *extensions);
1075
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FB
1076#endif /* HAVE_AV_CONFIG_H */
1077
5b21bdab 1078#endif /* FFMPEG_AVFORMAT_H */