Add option for user to scale the amount of dynamic range compression which is
[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
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24#define LIBAVFORMAT_VERSION_INT ((52<<16)+(3<<8)+0)
25#define LIBAVFORMAT_VERSION 52.3.0
5aa083ee 26#define LIBAVFORMAT_BUILD LIBAVFORMAT_VERSION_INT
8026c3b5 27
5aa083ee 28#define LIBAVFORMAT_IDENT "Lavf" AV_STRINGIFY(LIBAVFORMAT_VERSION)
4b1f4f23 29
f71869a4 30#include <time.h>
67070e4f 31#include <stdio.h> /* FILE */
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32#include "avcodec.h"
33
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34#include "avio.h"
35
36/* packet functions */
37
38typedef struct AVPacket {
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39 int64_t pts; ///< presentation time stamp in time_base units
40 int64_t dts; ///< decompression time stamp in time_base units
0c1a9eda 41 uint8_t *data;
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42 int size;
43 int stream_index;
44 int flags;
2692067a 45 int duration; ///< presentation duration in time_base units (0 if not available)
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46 void (*destruct)(struct AVPacket *);
47 void *priv;
2692067a 48 int64_t pos; ///< byte position in stream, -1 if unknown
115329f1 49} AVPacket;
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50#define PKT_FLAG_KEY 0x0001
51
63dd1377 52void av_destruct_packet_nofree(AVPacket *pkt);
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53
54/**
55 * Default packet destructor.
56 */
90ad92b3 57void av_destruct_packet(AVPacket *pkt);
63dd1377 58
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59/**
60 * Initialize optional fields of a packet to default values.
61 *
62 * @param pkt packet
63 */
659596f0 64void av_init_packet(AVPacket *pkt);
de6d9b64 65
3217cb42 66/**
ac3967c1 67 * Allocate the payload of a packet and initialize its fields to default values.
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68 *
69 * @param pkt packet
70 * @param size wanted payload size
71 * @return 0 if OK. AVERROR_xxx otherwise.
72 */
de6d9b64 73int av_new_packet(AVPacket *pkt, int size);
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74
75/**
ac3967c1 76 * Allocate and read the payload of a packet and initialize its fields to default values.
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77 *
78 * @param pkt packet
79 * @param size wanted payload size
80 * @return >0 (read size) if OK. AVERROR_xxx otherwise.
81 */
2692067a 82int av_get_packet(ByteIOContext *s, AVPacket *pkt, int size);
3217cb42 83
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84/**
85 * @warning This is a hack - the packet memory allocation stuff is broken. The
86 * packet is allocated if it was not really allocated
87 */
fb2758c8 88int av_dup_packet(AVPacket *pkt);
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89
90/**
91 * Free a packet
92 *
93 * @param pkt packet to free
94 */
95static inline void av_free_packet(AVPacket *pkt)
96{
342474ab 97 if (pkt && pkt->destruct) {
bb270c08 98 pkt->destruct(pkt);
342474ab 99 }
6fa5a56c 100}
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101
102/*************************************************/
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103/* fractional numbers for exact pts handling */
104
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105/**
106 * the exact value of the fractional number is: 'val + num / den'.
107 * num is assumed to be such as 0 <= num < den
108 * @deprecated Use AVRational instead
109*/
916c80e9 110typedef struct AVFrac {
115329f1 111 int64_t val, num, den;
955ab9a4 112} AVFrac attribute_deprecated;
916c80e9 113
916c80e9 114/*************************************************/
b9a281db 115/* input/output formats */
de6d9b64 116
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117struct AVCodecTag;
118
de6d9b64 119struct AVFormatContext;
b9a281db 120
43d414ba 121/** this structure contains the data a format has to probe a file */
b9a281db 122typedef struct AVProbeData {
5c91a675 123 const char *filename;
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124 unsigned char *buf;
125 int buf_size;
126} AVProbeData;
127
0288a747 128#define AVPROBE_SCORE_MAX 100 ///< max score, half of that is used for file extension based detection
87e87886 129#define AVPROBE_PADDING_SIZE 32 ///< extra allocated bytes at the end of the probe buffer
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130
131typedef struct AVFormatParameters {
c0df9d75 132 AVRational time_base;
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133 int sample_rate;
134 int channels;
135 int width;
136 int height;
4606ac8d 137 enum PixelFormat pix_fmt;
43d414ba 138 int channel; /**< used to select dv channel */
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139 const char *standard; /**< tv standard, NTSC, PAL, SECAM */
140 int mpeg2ts_raw:1; /**< force raw MPEG2 transport stream output, if possible */
141 int mpeg2ts_compute_pcr:1; /**< compute exact PCR for each transport
da24c5e3 142 stream packet (only meaningful if
864ff8c1 143 mpeg2ts_raw is TRUE) */
43d414ba 144 int initial_pause:1; /**< do not begin to play the stream
fb2758c8 145 immediately (RTSP only) */
4eb72c6b 146 int prealloced_context:1;
71957315 147#if LIBAVFORMAT_VERSION_INT < (53<<16)
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148 enum CodecID video_codec_id;
149 enum CodecID audio_codec_id;
71957315 150#endif
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151} AVFormatParameters;
152
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153//! demuxer will use url_fopen, no opened file should be provided by the caller
154#define AVFMT_NOFILE 0x0001
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155#define AVFMT_NEEDNUMBER 0x0002 /**< needs '%d' in filename */
156#define AVFMT_SHOW_IDS 0x0008 /**< show format stream IDs numbers */
157#define AVFMT_RAWPICTURE 0x0020 /**< format wants AVPicture structure for
fb025625 158 raw picture data */
43d414ba 159#define AVFMT_GLOBALHEADER 0x0040 /**< format wants global header */
755bfeab 160#define AVFMT_NOTIMESTAMPS 0x0080 /**< format does not need / have any timestamps */
43d414ba 161#define AVFMT_GENERIC_INDEX 0x0100 /**< use generic index building code */
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162
163typedef struct AVOutputFormat {
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164 const char *name;
165 const char *long_name;
166 const char *mime_type;
cf29452b 167 const char *extensions; /**< comma separated filename extensions */
43d414ba 168 /** size of private data so that it can be allocated in the wrapper */
b9a281db 169 int priv_data_size;
de6d9b64 170 /* output support */
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171 enum CodecID audio_codec; /**< default audio codec */
172 enum CodecID video_codec; /**< default video codec */
de6d9b64 173 int (*write_header)(struct AVFormatContext *);
e928649b 174 int (*write_packet)(struct AVFormatContext *, AVPacket *pkt);
de6d9b64 175 int (*write_trailer)(struct AVFormatContext *);
43d414ba 176 /** can use flags: AVFMT_NOFILE, AVFMT_NEEDNUMBER, AVFMT_GLOBALHEADER */
b9a281db 177 int flags;
43d414ba 178 /** currently only used to set pixel format if not YUV420P */
290c5fa6 179 int (*set_parameters)(struct AVFormatContext *, AVFormatParameters *);
fe2d6fe2 180 int (*interleave_packet)(struct AVFormatContext *, AVPacket *out, AVPacket *in, int flush);
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181
182 /**
183 * list of supported codec_id-codec_tag pairs, ordered by "better choice first"
184 * the arrays are all CODEC_ID_NONE terminated
185 */
6c77805f 186 const struct AVCodecTag **codec_tag;
7caf0cc6 187
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188 enum CodecID subtitle_codec; /**< default subtitle codec */
189
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190 /* private fields */
191 struct AVOutputFormat *next;
192} AVOutputFormat;
de6d9b64 193
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194typedef struct AVInputFormat {
195 const char *name;
196 const char *long_name;
43d414ba 197 /** size of private data so that it can be allocated in the wrapper */
b9a281db 198 int priv_data_size;
65d7d68b 199 /**
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200 * Tell if a given file has a chance of being parsed by this format.
201 * The buffer provided is guaranteed to be AVPROBE_PADDING_SIZE bytes
202 * big so you do not have to check for that unless you need more.
65d7d68b 203 */
b9a281db 204 int (*read_probe)(AVProbeData *);
43d414ba 205 /** read the format header and initialize the AVFormatContext
de6d9b64 206 structure. Return 0 if OK. 'ap' if non NULL contains
e42dba48 207 additional paramters. Only used in raw format right
b9a281db 208 now. 'av_new_stream' should be called to create new streams. */
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209 int (*read_header)(struct AVFormatContext *,
210 AVFormatParameters *ap);
43d414ba 211 /** read one packet and put it in 'pkt'. pts and flags are also
b9a281db 212 set. 'av_new_stream' can be called only if the flag
da24c5e3 213 AVFMTCTX_NOHEADER is used. */
de6d9b64 214 int (*read_packet)(struct AVFormatContext *, AVPacket *pkt);
43d414ba 215 /** close the stream. The AVFormatContext and AVStreams are not
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216 freed by this function */
217 int (*read_close)(struct AVFormatContext *);
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218 /**
219 * seek to a given timestamp relative to the frames in
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220 * stream component stream_index
221 * @param stream_index must not be -1
115329f1 222 * @param flags selects which direction should be preferred if no exact
3ba1438d 223 * match is available
05ce0f11 224 * @return >= 0 on success (but not necessarily the new offset)
3ba1438d 225 */
115329f1 226 int (*read_seek)(struct AVFormatContext *,
3ba1438d 227 int stream_index, int64_t timestamp, int flags);
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228 /**
229 * gets the next timestamp in AV_TIME_BASE units.
230 */
231 int64_t (*read_timestamp)(struct AVFormatContext *s, int stream_index,
232 int64_t *pos, int64_t pos_limit);
43d414ba 233 /** can use flags: AVFMT_NOFILE, AVFMT_NEEDNUMBER */
de6d9b64 234 int flags;
43d414ba 235 /** if extensions are defined, then no probe is done. You should
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236 usually not use extension format guessing because it is not
237 reliable enough */
238 const char *extensions;
43d414ba 239 /** general purpose read only value that the format can use */
b9a281db 240 int value;
fb2758c8 241
43d414ba 242 /** start/resume playing - only meaningful if using a network based format
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243 (RTSP) */
244 int (*read_play)(struct AVFormatContext *);
245
43d414ba 246 /** pause playing - only meaningful if using a network based format
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247 (RTSP) */
248 int (*read_pause)(struct AVFormatContext *);
249
6c77805f 250 const struct AVCodecTag **codec_tag;
7caf0cc6 251
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252 /* private fields */
253 struct AVInputFormat *next;
254} AVInputFormat;
de6d9b64 255
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256enum AVStreamParseType {
257 AVSTREAM_PARSE_NONE,
258 AVSTREAM_PARSE_FULL, /**< full parsing and repack */
259 AVSTREAM_PARSE_HEADERS, /**< only parse headers, don't repack */
260 AVSTREAM_PARSE_TIMESTAMPS, /**< full parsing and interpolation of timestamps for frames not starting on packet boundary */
261};
262
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263typedef struct AVIndexEntry {
264 int64_t pos;
265 int64_t timestamp;
266#define AVINDEX_KEYFRAME 0x0001
30a43f2d 267 int flags:2;
90b5b51e 268 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 269 int min_distance; /**< min distance between this and the previous keyframe, used to avoid unneeded searching */
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270} AVIndexEntry;
271
de6d9b64 272typedef struct AVStream {
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273 int index; /**< stream index in AVFormatContext */
274 int id; /**< format specific stream id */
275 AVCodecContext *codec; /**< codec context */
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276 /**
277 * real base frame rate of the stream.
e3c97c3b 278 * this is the lowest framerate with which all timestamps can be
864ff8c1 279 * represented accurately (it is the least common multiple of all
e3c97c3b 280 * framerates in the stream), Note, this value is just a guess!
115329f1 281 * for example if the timebase is 1/90000 and all frames have either
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282 * approximately 3600 or 1800 timer ticks then r_frame_rate will be 50/1
283 */
284 AVRational r_frame_rate;
de6d9b64 285 void *priv_data;
82583548 286
b9a281db 287 /* internal data used in av_find_stream_info() */
82583548 288 int64_t first_dts;
43d414ba 289 /** encoding: PTS generation when outputing stream */
a9fd2b19 290 struct AVFrac pts;
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291
292 /**
293 * this is the fundamental unit of time (in seconds) in terms
294 * of which frame timestamps are represented. for fixed-fps content,
295 * timebase should be 1/framerate and timestamp increments should be
296 * identically 1.
297 */
9ee91c2f 298 AVRational time_base;
43d414ba 299 int pts_wrap_bits; /**< number of bits in pts (used for wrapping control) */
a48b7a6b 300 /* ffmpeg.c private use */
15786dc4 301 int stream_copy; /**< if set, just copy stream */
755bfeab 302 enum AVDiscard discard; ///< selects which packets can be discarded at will and do not need to be demuxed
b4aea108 303 //FIXME move stuff to a flags field?
43d414ba 304 /** quality, as it has been removed from AVCodecContext and put in AVVideoFrame
755bfeab 305 * MN: dunno if that is the right place for it */
115329f1 306 float quality;
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307 /**
308 * decoding: pts of the first frame of the stream, in stream time base.
309 * only set this if you are absolutely 100% sure that the value you set
310 * it to really is the pts of the first frame
4854c253 311 * This may be undefined (AV_NOPTS_VALUE).
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312 * @note the ASF header does NOT contain a correct start_time the ASF
313 * demuxer must NOT set this
314 */
115329f1 315 int64_t start_time;
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316 /**
317 * decoding: duration of the stream, in stream time base.
318 * If a source file does not specify a duration, but does specify
319 * a bitrate, this value will be estimates from bit rate and file size.
320 */
ee404803 321 int64_t duration;
fb2758c8 322
43d414ba 323 char language[4]; /** ISO 639 3-letter language code (empty string if undefined) */
09730260 324
fb2758c8 325 /* av_read_frame() support */
57004ff1 326 enum AVStreamParseType need_parsing;
fb2758c8 327 struct AVCodecParserContext *parser;
6ec87caa 328
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329 int64_t cur_dts;
330 int last_IP_duration;
77405fc8 331 int64_t last_IP_pts;
fb2758c8 332 /* av_seek_frame() support */
43d414ba 333 AVIndexEntry *index_entries; /**< only used if the format does not
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334 support seeking natively */
335 int nb_index_entries;
191e8ca7 336 unsigned int index_entries_allocated_size;
115329f1 337
b4b87d48 338 int64_t nb_frames; ///< number of frames in this stream if known or 0
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339
340#define MAX_REORDER_DELAY 4
341 int64_t pts_buffer[MAX_REORDER_DELAY+1];
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342} AVStream;
343
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344#define AV_PROGRAM_RUNNING 1
345
346typedef struct AVProgram {
347 int id;
348 char *provider_name; ///< Network name for DVB streams
349 char *name; ///< Service name for DVB streams
350 int flags;
351 enum AVDiscard discard; ///< selects which program to discard and which to feed to the caller
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352 unsigned int *stream_index;
353 unsigned int nb_stream_indexes;
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354} AVProgram;
355
43d414ba 356#define AVFMTCTX_NOHEADER 0x0001 /**< signal that no header is present
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357 (streams are added dynamically) */
358
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359#define MAX_STREAMS 20
360
361/* format I/O context */
362typedef struct AVFormatContext {
43d414ba 363 const AVClass *av_class; /**< set by av_alloc_format_context */
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364 /* can only be iformat or oformat, not both at the same time */
365 struct AVInputFormat *iformat;
366 struct AVOutputFormat *oformat;
de6d9b64 367 void *priv_data;
899681cd 368 ByteIOContext *pb;
db69c2e5 369 unsigned int nb_streams;
de6d9b64 370 AVStream *streams[MAX_STREAMS];
43d414ba 371 char filename[1024]; /**< input or output filename */
de6d9b64 372 /* stream info */
4568325a 373 int64_t timestamp;
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374 char title[512];
375 char author[512];
376 char copyright[512];
377 char comment[512];
6a58e151 378 char album[512];
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379 int year; /**< ID3 year, 0 if none */
380 int track; /**< track number, 0 if none */
381 char genre[32]; /**< ID3 genre */
6a58e151 382
43d414ba 383 int ctx_flags; /**< format specific flags, see AVFMTCTX_xx */
916c80e9 384 /* private data for pts handling (do not modify directly) */
43d414ba 385 /** This buffer is only needed when packets were already buffered but
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386 not decoded, for example to get the codec parameters in mpeg
387 streams */
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388 struct AVPacketList *packet_buffer;
389
43d414ba 390 /** decoding: position of the first frame of the component, in
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391 AV_TIME_BASE fractional seconds. NEVER set this value directly:
392 it is deduced from the AVStream values. */
115329f1 393 int64_t start_time;
43d414ba 394 /** decoding: duration of the stream, in AV_TIME_BASE fractional
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395 seconds. NEVER set this value directly: it is deduced from the
396 AVStream values. */
397 int64_t duration;
43d414ba 398 /** decoding: total file size. 0 if unknown */
ee404803 399 int64_t file_size;
43d414ba 400 /** decoding: total stream bitrate in bit/s, 0 if not
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401 available. Never set it directly if the file_size and the
402 duration are known as ffmpeg can compute it automatically. */
403 int bit_rate;
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404
405 /* av_read_frame() support */
406 AVStream *cur_st;
407 const uint8_t *cur_ptr;
408 int cur_len;
409 AVPacket cur_pkt;
410
fb2758c8 411 /* av_seek_frame() support */
43d414ba 412 int64_t data_offset; /** offset of the first packet */
fb2758c8 413 int index_built;
115329f1 414
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415 int mux_rate;
416 int packet_size;
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417 int preload;
418 int max_delay;
8108551a 419
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420#define AVFMT_NOOUTPUTLOOP -1
421#define AVFMT_INFINITEOUTPUTLOOP 0
43d414ba 422 /** number of times to loop output in formats that support it */
8108551a 423 int loop_output;
115329f1 424
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425 int flags;
426#define AVFMT_FLAG_GENPTS 0x0001 ///< generate pts if missing even if it requires parsing future frames
2c00106c 427#define AVFMT_FLAG_IGNIDX 0x0002 ///< ignore index
bf09c2e2 428#define AVFMT_FLAG_NONBLOCK 0x0004 ///< do not block when reading packets from input
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429
430 int loop_input;
43d414ba 431 /** decoding: size of data to probe; encoding unused */
9e6c9470 432 unsigned int probesize;
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433
434 /**
435 * maximum duration in AV_TIME_BASE units over which the input should be analyzed in av_find_stream_info()
436 */
437 int max_analyze_duration;
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438
439 const uint8_t *key;
440 int keylen;
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441
442 unsigned int nb_programs;
443 AVProgram **programs;
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444
445 /**
446 * Forced video codec_id.
447 * demuxing: set by user
448 */
449 enum CodecID video_codec_id;
450 /**
451 * Forced audio codec_id.
452 * demuxing: set by user
453 */
454 enum CodecID audio_codec_id;
455 /**
456 * Forced subtitle codec_id.
457 * demuxing: set by user
458 */
459 enum CodecID subtitle_codec_id;
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460} AVFormatContext;
461
462typedef struct AVPacketList {
463 AVPacket pkt;
464 struct AVPacketList *next;
465} AVPacketList;
466
84be6e72 467#if LIBAVFORMAT_VERSION_INT < (53<<16)
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468extern AVInputFormat *first_iformat;
469extern AVOutputFormat *first_oformat;
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470#endif
471
472AVInputFormat *av_iformat_next(AVInputFormat *f);
473AVOutputFormat *av_oformat_next(AVOutputFormat *f);
de6d9b64 474
5b6d5596 475enum CodecID av_guess_image2_codec(const char *filename);
290c5fa6 476
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477/* XXX: use automatic init with either ELF sections or C file parser */
478/* modules */
de6d9b64 479
b9a281db 480/* utils.c */
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481void av_register_input_format(AVInputFormat *format);
482void av_register_output_format(AVOutputFormat *format);
115329f1 483AVOutputFormat *guess_stream_format(const char *short_name,
36ada60c 484 const char *filename, const char *mime_type);
115329f1 485AVOutputFormat *guess_format(const char *short_name,
b9a281db 486 const char *filename, const char *mime_type);
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487
488/**
489 * Guesses the codec id based upon muxer and filename.
490 */
115329f1 491enum CodecID av_guess_codec(AVOutputFormat *fmt, const char *short_name,
5b6d5596 492 const char *filename, const char *mime_type, enum CodecType type);
de6d9b64 493
3217cb42 494/**
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495 * Send a nice hexadecimal dump of a buffer to the specified file stream.
496 *
497 * @param f The file stream pointer where the dump should be sent to.
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498 * @param buf buffer
499 * @param size buffer size
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500 *
501 * @see av_hex_dump_log, av_pkt_dump, av_pkt_dump_log
3217cb42 502 */
fb2758c8 503void av_hex_dump(FILE *f, uint8_t *buf, int size);
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504
505/**
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506 * Send a nice hexadecimal dump of a buffer to the log.
507 *
508 * @param avcl A pointer to an arbitrary struct of which the first field is a
509 * pointer to an AVClass struct.
510 * @param level The importance level of the message, lower values signifying
511 * higher importance.
512 * @param buf buffer
513 * @param size buffer size
514 *
515 * @see av_hex_dump, av_pkt_dump, av_pkt_dump_log
516 */
517void av_hex_dump_log(void *avcl, int level, uint8_t *buf, int size);
518
519/**
520 * Send a nice dump of a packet to the specified file stream.
521 *
522 * @param f The file stream pointer where the dump should be sent to.
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523 * @param pkt packet to dump
524 * @param dump_payload true if the payload must be displayed too
525 */
fb2758c8 526void av_pkt_dump(FILE *f, AVPacket *pkt, int dump_payload);
de6d9b64 527
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528/**
529 * Send a nice dump of a packet to the log.
530 *
531 * @param avcl A pointer to an arbitrary struct of which the first field is a
532 * pointer to an AVClass struct.
533 * @param level The importance level of the message, lower values signifying
534 * higher importance.
535 * @param pkt packet to dump
536 * @param dump_payload true if the payload must be displayed too
537 */
538void av_pkt_dump_log(void *avcl, int level, AVPacket *pkt, int dump_payload);
539
94988531 540void av_register_all(void);
de6d9b64 541
43d414ba 542/** codec tag <-> codec id */
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543enum CodecID av_codec_get_id(const struct AVCodecTag **tags, unsigned int tag);
544unsigned int av_codec_get_tag(const struct AVCodecTag **tags, enum CodecID id);
7caf0cc6 545
b9a281db 546/* media file input */
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547
548/**
549 * finds AVInputFormat based on input format's short name.
550 */
b9a281db 551AVInputFormat *av_find_input_format(const char *short_name);
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552
553/**
554 * Guess file format.
555 *
556 * @param is_opened whether the file is already opened, determines whether
557 * demuxers with or without AVFMT_NOFILE are probed
558 */
94988531 559AVInputFormat *av_probe_input_format(AVProbeData *pd, int is_opened);
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560
561/**
562 * Allocates all the structures needed to read an input stream.
563 * This does not open the needed codecs for decoding the stream[s].
564 */
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565int av_open_input_stream(AVFormatContext **ic_ptr,
566 ByteIOContext *pb, const char *filename,
da24c5e3 567 AVInputFormat *fmt, AVFormatParameters *ap);
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568
569/**
864ff8c1 570 * Open a media file as input. The codecs are not opened. Only the file
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571 * header (if present) is read.
572 *
573 * @param ic_ptr the opened media file handle is put here
574 * @param filename filename to open.
575 * @param fmt if non NULL, force the file format to use
576 * @param buf_size optional buffer size (zero if default is OK)
e42dba48 577 * @param ap additional parameters needed when opening the file (NULL if default)
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578 * @return 0 if OK. AVERROR_xxx otherwise.
579 */
115329f1 580int av_open_input_file(AVFormatContext **ic_ptr, const char *filename,
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581 AVInputFormat *fmt,
582 int buf_size,
583 AVFormatParameters *ap);
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584/**
585 * Allocate an AVFormatContext.
5d81d641 586 * Can be freed with av_free() but do not forget to free everything you
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587 * explicitly allocated as well!
588 */
bc874dae 589AVFormatContext *av_alloc_format_context(void);
b9a281db 590
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591/**
592 * Read packets of a media file to get stream information. This
593 * is useful for file formats with no headers such as MPEG. This
594 * function also computes the real frame rate in case of mpeg2 repeat
595 * frame mode.
596 * The logical file position is not changed by this function;
597 * examined packets may be buffered for later processing.
598 *
599 * @param ic media file handle
600 * @return >=0 if OK. AVERROR_xxx if error.
4e8988a3 601 * @todo Let user decide somehow what information is needed so we do not waste time getting stuff the user does not need.
3217cb42 602 */
b9a281db 603int av_find_stream_info(AVFormatContext *ic);
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604
605/**
606 * Read a transport packet from a media file.
607 *
864ff8c1 608 * This function is obsolete and should never be used.
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609 * Use av_read_frame() instead.
610 *
611 * @param s media file handle
612 * @param pkt is filled
613 * @return 0 if OK. AVERROR_xxx if error.
614 */
de6d9b64 615int av_read_packet(AVFormatContext *s, AVPacket *pkt);
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616
617/**
618 * Return the next frame of a stream.
619 *
620 * The returned packet is valid
621 * until the next av_read_frame() or until av_close_input_file() and
622 * must be freed with av_free_packet. For video, the packet contains
623 * exactly one frame. For audio, it contains an integer number of
624 * frames if each frame has a known fixed size (e.g. PCM or ADPCM
625 * data). If the audio frames have a variable size (e.g. MPEG audio),
626 * then it contains one frame.
627 *
628 * pkt->pts, pkt->dts and pkt->duration are always set to correct
a050f802 629 * values in AVStream.timebase units (and guessed if the format cannot
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630 * provided them). pkt->pts can be AV_NOPTS_VALUE if the video format
631 * has B frames, so it is better to rely on pkt->dts if you do not
632 * decompress the payload.
633 *
634 * @return 0 if OK, < 0 if error or end of file.
635 */
fb2758c8 636int av_read_frame(AVFormatContext *s, AVPacket *pkt);
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637
638/**
639 * Seek to the key frame at timestamp.
640 * 'timestamp' in 'stream_index'.
641 * @param stream_index If stream_index is (-1), a default
642 * stream is selected, and timestamp is automatically converted
643 * from AV_TIME_BASE units to the stream specific time_base.
644 * @param timestamp timestamp in AVStream.time_base units
645 * or if there is no stream specified then in AV_TIME_BASE units
646 * @param flags flags which select direction and seeking mode
647 * @return >= 0 on success
648 */
3ba1438d 649int av_seek_frame(AVFormatContext *s, int stream_index, int64_t timestamp, int flags);
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650
651/**
652 * start playing a network based stream (e.g. RTSP stream) at the
653 * current position
654 */
fb2758c8 655int av_read_play(AVFormatContext *s);
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656
657/**
658 * Pause a network based stream (e.g. RTSP stream).
659 *
660 * Use av_read_play() to resume it.
661 */
fb2758c8 662int av_read_pause(AVFormatContext *s);
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663
664/**
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665 * Free a AVFormatContext allocated by av_open_input_stream.
666 * @param s context to free
667 */
668void av_close_input_stream(AVFormatContext *s);
669
670/**
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671 * Close a media file (but not its codecs).
672 *
673 * @param s media file handle
674 */
de6d9b64 675void av_close_input_file(AVFormatContext *s);
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676
677/**
678 * Add a new stream to a media file.
679 *
680 * Can only be called in the read_header() function. If the flag
681 * AVFMTCTX_NOHEADER is in the format context, then new streams
682 * can be added in read_packet too.
683 *
684 * @param s media file handle
685 * @param id file format dependent stream id
686 */
b9a281db 687AVStream *av_new_stream(AVFormatContext *s, int id);
15afa396 688AVProgram *av_new_program(AVFormatContext *s, int id);
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689
690/**
691 * Set the pts for a given stream.
692 *
693 * @param s stream
694 * @param pts_wrap_bits number of bits effectively used by the pts
695 * (used for wrap control, 33 is the value for MPEG)
696 * @param pts_num numerator to convert to seconds (MPEG: 1)
697 * @param pts_den denominator to convert to seconds (MPEG: 90000)
698 */
9ee91c2f 699void av_set_pts_info(AVStream *s, int pts_wrap_bits,
916c80e9 700 int pts_num, int pts_den);
de6d9b64 701
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702#define AVSEEK_FLAG_BACKWARD 1 ///< seek backward
703#define AVSEEK_FLAG_BYTE 2 ///< seeking based on position in bytes
27a5fe5f 704#define AVSEEK_FLAG_ANY 4 ///< seek to any frame, even non keyframes
3ba1438d 705
b754978a 706int av_find_default_stream_index(AVFormatContext *s);
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707
708/**
709 * Gets the index for a specific timestamp.
710 * @param flags if AVSEEK_FLAG_BACKWARD then the returned index will correspond to
711 * the timestamp which is <= the requested one, if backward is 0
712 * then it will be >=
713 * if AVSEEK_FLAG_ANY seek to any frame, only keyframes otherwise
714 * @return < 0 if no such timestamp could be found
715 */
dc56fc38 716int av_index_search_timestamp(AVStream *st, int64_t timestamp, int flags);
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717
718/**
719 * Add a index entry into a sorted list updateing if it is already there.
720 *
721 * @param timestamp timestamp in the timebase of the given stream
722 */
3e9245a9 723int av_add_index_entry(AVStream *st,
30a43f2d 724 int64_t pos, int64_t timestamp, int size, int distance, int flags);
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725
726/**
727 * Does a binary search using av_index_search_timestamp() and AVCodec.read_timestamp().
755bfeab 728 * This is not supposed to be called directly by a user application, but by demuxers.
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729 * @param target_ts target timestamp in the time base of the given stream
730 * @param stream_index stream number
731 */
3ba1438d 732int av_seek_frame_binary(AVFormatContext *s, int stream_index, int64_t target_ts, int flags);
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733
734/**
735 * Updates cur_dts of all streams based on given timestamp and AVStream.
736 *
737 * Stream ref_st unchanged, others set cur_dts in their native timebase
755bfeab 738 * only needed for timestamp wrapping or if (dts not set and pts!=dts).
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739 * @param timestamp new dts expressed in time_base of param ref_st
740 * @param ref_st reference stream giving time_base of param timestamp
741 */
22ffac70 742void av_update_cur_dts(AVFormatContext *s, AVStream *ref_st, int64_t timestamp);
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743
744/**
745 * Does a binary search using read_timestamp().
755bfeab 746 * This is not supposed to be called directly by a user application, but by demuxers.
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747 * @param target_ts target timestamp in the time base of the given stream
748 * @param stream_index stream number
749 */
89ddd2a9 750int64_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 751
43d414ba 752/** media file output */
290c5fa6 753int av_set_parameters(AVFormatContext *s, AVFormatParameters *ap);
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754
755/**
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756 * Allocate the stream private data and write the stream header to an
757 * output media file.
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758 *
759 * @param s media file handle
760 * @return 0 if OK. AVERROR_xxx if error.
761 */
b9a281db 762int av_write_header(AVFormatContext *s);
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763
764/**
765 * Write a packet to an output media file.
766 *
767 * The packet shall contain one audio or video frame.
768 * The packet must be correctly interleaved according to the container specification,
769 * if not then av_interleaved_write_frame must be used
770 *
771 * @param s media file handle
772 * @param pkt the packet, which contains the stream_index, buf/buf_size, dts/pts, ...
773 * @return < 0 if error, = 0 if OK, 1 if end of stream wanted.
774 */
e928649b 775int av_write_frame(AVFormatContext *s, AVPacket *pkt);
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776
777/**
778 * Writes a packet to an output media file ensuring correct interleaving.
779 *
780 * The packet must contain one audio or video frame.
781 * If the packets are already correctly interleaved the application should
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782 * call av_write_frame() instead as it is slightly faster. It is also important
783 * to keep in mind that completely non-interleaved input will need huge amounts
784 * of memory to interleave with this, so it is preferable to interleave at the
785 * demuxer level.
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786 *
787 * @param s media file handle
788 * @param pkt the packet, which contains the stream_index, buf/buf_size, dts/pts, ...
789 * @return < 0 if error, = 0 if OK, 1 if end of stream wanted.
790 */
3c895fc0 791int av_interleaved_write_frame(AVFormatContext *s, AVPacket *pkt);
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792
793/**
794 * Interleave a packet per DTS in an output media file.
795 *
796 * Packets with pkt->destruct == av_destruct_packet will be freed inside this function,
797 * so they cannot be used after it, note calling av_free_packet() on them is still safe.
798 *
799 * @param s media file handle
800 * @param out the interleaved packet will be output here
801 * @param in the input packet
802 * @param flush 1 if no further packets are available as input and all
803 * remaining packets should be output
804 * @return 1 if a packet was output, 0 if no packet could be output,
805 * < 0 if an error occured
806 */
f21c0b4c 807int av_interleave_packet_per_dts(AVFormatContext *s, AVPacket *out, AVPacket *pkt, int flush);
e928649b 808
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809/**
810 * @brief Write the stream trailer to an output media file and
811 * free the file private data.
812 *
813 * @param s media file handle
814 * @return 0 if OK. AVERROR_xxx if error.
815 */
b9a281db 816int av_write_trailer(AVFormatContext *s);
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817
818void dump_format(AVFormatContext *ic,
115329f1 819 int index,
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820 const char *url,
821 int is_output);
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822
823/**
824 * parses width and height out of string str.
26ef3220 825 * @deprecated Use av_parse_video_frame_size instead.
3217cb42 826 */
26ef3220 827attribute_deprecated int parse_image_size(int *width_ptr, int *height_ptr, const char *str);
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828
829/**
830 * Converts frame rate from string to a fraction.
26ef3220 831 * @deprecated Use av_parse_video_frame_rate instead.
3217cb42 832 */
26ef3220 833attribute_deprecated int parse_frame_rate(int *frame_rate, int *frame_rate_base, const char *arg);
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834
835/**
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836 * Parses \p datestr and returns a corresponding number of microseconds.
837 * @param datestr String representing a date or a duration.
838 * - If a date the syntax is:
3217cb42 839 * @code
3217cb42 840 * [{YYYY-MM-DD|YYYYMMDD}]{T| }{HH[:MM[:SS[.m...]]][Z]|HH[MM[SS[.m...]]][Z]}
3217cb42 841 * @endcode
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842 * Time is localtime unless Z is appended, in which case it is
843 * interpreted as UTC.
844 * If the year-month-day part isn't specified it takes the current
845 * year-month-day.
846 * Returns the number of microseconds since 1st of January, 1970 up to
847 * the time of the parsed date or INT64_MIN if \p datestr cannot be
848 * successfully parsed.
849 * - If a duration the syntax is:
850 * @code
851 * [-]HH[:MM[:SS[.m...]]]
852 * [-]S+[.m...]
853 * @endcode
854 * Returns the number of microseconds contained in a time interval
855 * with the specified duration or INT64_MIN if \p datestr cannot be
7338d368 856 * successfully parsed.
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857 * @param duration Flag which tells how to interpret \p datestr, if
858 * not zero \p datestr is interpreted as a duration, otherwise as a
859 * date.
3217cb42 860 */
0c1a9eda 861int64_t parse_date(const char *datestr, int duration);
de6d9b64 862
0c1a9eda 863int64_t av_gettime(void);
94988531 864
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865/* ffm specific for ffserver */
866#define FFM_PACKET_SIZE 4096
867offset_t ffm_read_write_index(int fd);
868void ffm_write_write_index(int fd, offset_t pos);
869void ffm_set_write_index(AVFormatContext *s, offset_t pos, offset_t file_size);
870
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871/**
872 * Attempts to find a specific tag in a URL.
873 *
874 * syntax: '?tag1=val1&tag2=val2...'. Little URL decoding is done.
875 * Return 1 if found.
876 */
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877int find_info_tag(char *arg, int arg_size, const char *tag1, const char *info);
878
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879/**
880 * Returns in 'buf' the path with '%d' replaced by number.
881
882 * Also handles the '%0nd' format where 'n' is the total number
883 * of digits and '%%'.
884 *
885 * @param buf destination buffer
886 * @param buf_size destination buffer size
887 * @param path numbered sequence string
8ea0e802 888 * @param number frame number
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889 * @return 0 if OK, -1 if format error.
890 */
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891int av_get_frame_filename(char *buf, int buf_size,
892 const char *path, int number);
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893
894/**
895 * Check whether filename actually is a numbered sequence generator.
896 *
897 * @param filename possible numbered sequence string
898 * @return 1 if a valid numbered sequence string, 0 otherwise.
899 */
5c07cf53 900int av_filename_number_test(const char *filename);
96baaa6a 901
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902/**
903 * Generate an SDP for an RTP session.
904 *
905 * @param ac array of AVFormatContexts describing the RTP streams. If the
906 * array is composed by only one context, such context can contain
907 * multiple AVStreams (one AVStream per RTP stream). Otherwise,
908 * all the contexts in the array (an AVCodecContext per RTP stream)
909 * must contain only one AVStream
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910 * @param n_files number of AVCodecContexts contained in ac
911 * @param buff buffer where the SDP will be stored (must be allocated by
912 * the caller
913 * @param size the size of the buffer
914 * @return 0 if OK. AVERROR_xxx if error.
c5388c07 915 */
8767b80f 916int avf_sdp_create(AVFormatContext *ac[], int n_files, char *buff, int size);
c5388c07 917
fb025625 918#ifdef HAVE_AV_CONFIG_H
f71869a4 919
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920void __dynarray_add(unsigned long **tab_ptr, int *nb_ptr, unsigned long elem);
921
e4e70d2e 922#ifdef __GNUC__
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923#define dynarray_add(tab, nb_ptr, elem)\
924do {\
925 typeof(tab) _tab = (tab);\
926 typeof(elem) _elem = (elem);\
927 (void)sizeof(**_tab == _elem); /* check that types are compatible */\
928 __dynarray_add((unsigned long **)_tab, nb_ptr, (unsigned long)_elem);\
929} while(0)
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930#else
931#define dynarray_add(tab, nb_ptr, elem)\
932do {\
933 __dynarray_add((unsigned long **)(tab), nb_ptr, (unsigned long)(elem));\
934} while(0)
935#endif
39f472c3 936
f71869a4 937time_t mktimegm(struct tm *tm);
0c9fc6e1 938struct tm *brktimegm(time_t secs, struct tm *tm);
115329f1 939const char *small_strptime(const char *p, const char *fmt,
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940 struct tm *dt);
941
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942struct in_addr;
943int resolve_host(struct in_addr *sin_addr, const char *hostname);
944
945void url_split(char *proto, int proto_size,
6ba5cbc6 946 char *authorization, int authorization_size,
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947 char *hostname, int hostname_size,
948 int *port_ptr,
949 char *path, int path_size,
950 const char *url);
951
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952int match_ext(const char *filename, const char *extensions);
953
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954#endif /* HAVE_AV_CONFIG_H */
955
5b21bdab 956#endif /* FFMPEG_AVFORMAT_H */