include snow encoder only if it is not disabled
[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 AVFORMAT_H
22#define AVFORMAT_H
de6d9b64 23
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24#define LIBAVFORMAT_VERSION_INT ((51<<16)+(12<<8)+1)
25#define LIBAVFORMAT_VERSION 51.12.1
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 */
cc58300e 139#if LIBAVFORMAT_VERSION_INT < (52<<16)
43d414ba 140 const char *device; /**< video, audio or DV device */
cc58300e 141#endif
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142 const char *standard; /**< tv standard, NTSC, PAL, SECAM */
143 int mpeg2ts_raw:1; /**< force raw MPEG2 transport stream output, if possible */
144 int mpeg2ts_compute_pcr:1; /**< compute exact PCR for each transport
da24c5e3 145 stream packet (only meaningful if
864ff8c1 146 mpeg2ts_raw is TRUE) */
43d414ba 147 int initial_pause:1; /**< do not begin to play the stream
fb2758c8 148 immediately (RTSP only) */
4eb72c6b 149 int prealloced_context:1;
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150 enum CodecID video_codec_id;
151 enum CodecID audio_codec_id;
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152} AVFormatParameters;
153
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154//! demuxer will use url_fopen, no opened file should be provided by the caller
155#define AVFMT_NOFILE 0x0001
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156#define AVFMT_NEEDNUMBER 0x0002 /**< needs '%d' in filename */
157#define AVFMT_SHOW_IDS 0x0008 /**< show format stream IDs numbers */
158#define AVFMT_RAWPICTURE 0x0020 /**< format wants AVPicture structure for
fb025625 159 raw picture data */
43d414ba 160#define AVFMT_GLOBALHEADER 0x0040 /**< format wants global header */
755bfeab 161#define AVFMT_NOTIMESTAMPS 0x0080 /**< format does not need / have any timestamps */
43d414ba 162#define AVFMT_GENERIC_INDEX 0x0100 /**< use generic index building code */
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163
164typedef struct AVOutputFormat {
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165 const char *name;
166 const char *long_name;
167 const char *mime_type;
cf29452b 168 const char *extensions; /**< comma separated filename extensions */
43d414ba 169 /** size of private data so that it can be allocated in the wrapper */
b9a281db 170 int priv_data_size;
de6d9b64 171 /* output support */
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172 enum CodecID audio_codec; /**< default audio codec */
173 enum CodecID video_codec; /**< default video codec */
de6d9b64 174 int (*write_header)(struct AVFormatContext *);
e928649b 175 int (*write_packet)(struct AVFormatContext *, AVPacket *pkt);
de6d9b64 176 int (*write_trailer)(struct AVFormatContext *);
43d414ba 177 /** can use flags: AVFMT_NOFILE, AVFMT_NEEDNUMBER, AVFMT_GLOBALHEADER */
b9a281db 178 int flags;
43d414ba 179 /** currently only used to set pixel format if not YUV420P */
290c5fa6 180 int (*set_parameters)(struct AVFormatContext *, AVFormatParameters *);
fe2d6fe2 181 int (*interleave_packet)(struct AVFormatContext *, AVPacket *out, AVPacket *in, int flush);
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182
183 /**
184 * list of supported codec_id-codec_tag pairs, ordered by "better choice first"
185 * the arrays are all CODEC_ID_NONE terminated
186 */
6c77805f 187 const struct AVCodecTag **codec_tag;
7caf0cc6 188
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189 /* private fields */
190 struct AVOutputFormat *next;
191} AVOutputFormat;
de6d9b64 192
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193typedef struct AVInputFormat {
194 const char *name;
195 const char *long_name;
43d414ba 196 /** size of private data so that it can be allocated in the wrapper */
b9a281db 197 int priv_data_size;
864ff8c1 198 /** tell if a given file has a chance of being parsed by this format */
b9a281db 199 int (*read_probe)(AVProbeData *);
43d414ba 200 /** read the format header and initialize the AVFormatContext
de6d9b64 201 structure. Return 0 if OK. 'ap' if non NULL contains
e42dba48 202 additional paramters. Only used in raw format right
b9a281db 203 now. 'av_new_stream' should be called to create new streams. */
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204 int (*read_header)(struct AVFormatContext *,
205 AVFormatParameters *ap);
43d414ba 206 /** read one packet and put it in 'pkt'. pts and flags are also
b9a281db 207 set. 'av_new_stream' can be called only if the flag
da24c5e3 208 AVFMTCTX_NOHEADER is used. */
de6d9b64 209 int (*read_packet)(struct AVFormatContext *, AVPacket *pkt);
43d414ba 210 /** close the stream. The AVFormatContext and AVStreams are not
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211 freed by this function */
212 int (*read_close)(struct AVFormatContext *);
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213 /**
214 * seek to a given timestamp relative to the frames in
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215 * stream component stream_index
216 * @param stream_index must not be -1
115329f1 217 * @param flags selects which direction should be preferred if no exact
3ba1438d 218 * match is available
05ce0f11 219 * @return >= 0 on success (but not necessarily the new offset)
3ba1438d 220 */
115329f1 221 int (*read_seek)(struct AVFormatContext *,
3ba1438d 222 int stream_index, int64_t timestamp, int flags);
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223 /**
224 * gets the next timestamp in AV_TIME_BASE units.
225 */
226 int64_t (*read_timestamp)(struct AVFormatContext *s, int stream_index,
227 int64_t *pos, int64_t pos_limit);
43d414ba 228 /** can use flags: AVFMT_NOFILE, AVFMT_NEEDNUMBER */
de6d9b64 229 int flags;
43d414ba 230 /** if extensions are defined, then no probe is done. You should
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231 usually not use extension format guessing because it is not
232 reliable enough */
233 const char *extensions;
43d414ba 234 /** general purpose read only value that the format can use */
b9a281db 235 int value;
fb2758c8 236
43d414ba 237 /** start/resume playing - only meaningful if using a network based format
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238 (RTSP) */
239 int (*read_play)(struct AVFormatContext *);
240
43d414ba 241 /** pause playing - only meaningful if using a network based format
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242 (RTSP) */
243 int (*read_pause)(struct AVFormatContext *);
244
6c77805f 245 const struct AVCodecTag **codec_tag;
7caf0cc6 246
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247 /* private fields */
248 struct AVInputFormat *next;
249} AVInputFormat;
de6d9b64 250
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251enum AVStreamParseType {
252 AVSTREAM_PARSE_NONE,
253 AVSTREAM_PARSE_FULL, /**< full parsing and repack */
254 AVSTREAM_PARSE_HEADERS, /**< only parse headers, don't repack */
255 AVSTREAM_PARSE_TIMESTAMPS, /**< full parsing and interpolation of timestamps for frames not starting on packet boundary */
256};
257
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258typedef struct AVIndexEntry {
259 int64_t pos;
260 int64_t timestamp;
261#define AVINDEX_KEYFRAME 0x0001
30a43f2d 262 int flags:2;
90b5b51e 263 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 264 int min_distance; /**< min distance between this and the previous keyframe, used to avoid unneeded searching */
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265} AVIndexEntry;
266
de6d9b64 267typedef struct AVStream {
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268 int index; /**< stream index in AVFormatContext */
269 int id; /**< format specific stream id */
270 AVCodecContext *codec; /**< codec context */
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271 /**
272 * real base frame rate of the stream.
e3c97c3b 273 * this is the lowest framerate with which all timestamps can be
864ff8c1 274 * represented accurately (it is the least common multiple of all
e3c97c3b 275 * framerates in the stream), Note, this value is just a guess!
115329f1 276 * for example if the timebase is 1/90000 and all frames have either
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277 * approximately 3600 or 1800 timer ticks then r_frame_rate will be 50/1
278 */
279 AVRational r_frame_rate;
de6d9b64 280 void *priv_data;
ea486ab3 281#if LIBAVFORMAT_VERSION_INT < (52<<16)
b9a281db 282 /* internal data used in av_find_stream_info() */
115329f1 283 int64_t codec_info_duration;
fb2758c8 284 int codec_info_nb_frames;
ea486ab3 285#endif
43d414ba 286 /** encoding: PTS generation when outputing stream */
1e51d801 287 AVFrac pts;
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288
289 /**
290 * this is the fundamental unit of time (in seconds) in terms
291 * of which frame timestamps are represented. for fixed-fps content,
292 * timebase should be 1/framerate and timestamp increments should be
293 * identically 1.
294 */
9ee91c2f 295 AVRational time_base;
43d414ba 296 int pts_wrap_bits; /**< number of bits in pts (used for wrapping control) */
a48b7a6b 297 /* ffmpeg.c private use */
15786dc4 298 int stream_copy; /**< if set, just copy stream */
755bfeab 299 enum AVDiscard discard; ///< selects which packets can be discarded at will and do not need to be demuxed
b4aea108 300 //FIXME move stuff to a flags field?
43d414ba 301 /** quality, as it has been removed from AVCodecContext and put in AVVideoFrame
755bfeab 302 * MN: dunno if that is the right place for it */
115329f1 303 float quality;
25406e50 304 /** decoding: pts of the first frame of the stream, in stream time base. */
115329f1 305 int64_t start_time;
25406e50 306 /** decoding: duration of the stream, in stream time base. */
ee404803 307 int64_t duration;
fb2758c8 308
43d414ba 309 char language[4]; /** ISO 639 3-letter language code (empty string if undefined) */
09730260 310
fb2758c8 311 /* av_read_frame() support */
57004ff1 312 enum AVStreamParseType need_parsing;
fb2758c8 313 struct AVCodecParserContext *parser;
6ec87caa 314
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315 int64_t cur_dts;
316 int last_IP_duration;
77405fc8 317 int64_t last_IP_pts;
fb2758c8 318 /* av_seek_frame() support */
43d414ba 319 AVIndexEntry *index_entries; /**< only used if the format does not
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320 support seeking natively */
321 int nb_index_entries;
191e8ca7 322 unsigned int index_entries_allocated_size;
115329f1 323
b4b87d48 324 int64_t nb_frames; ///< number of frames in this stream if known or 0
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325
326#define MAX_REORDER_DELAY 4
327 int64_t pts_buffer[MAX_REORDER_DELAY+1];
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328} AVStream;
329
43d414ba 330#define AVFMTCTX_NOHEADER 0x0001 /**< signal that no header is present
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331 (streams are added dynamically) */
332
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333#define MAX_STREAMS 20
334
335/* format I/O context */
336typedef struct AVFormatContext {
43d414ba 337 const AVClass *av_class; /**< set by av_alloc_format_context */
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338 /* can only be iformat or oformat, not both at the same time */
339 struct AVInputFormat *iformat;
340 struct AVOutputFormat *oformat;
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341 void *priv_data;
342 ByteIOContext pb;
db69c2e5 343 unsigned int nb_streams;
de6d9b64 344 AVStream *streams[MAX_STREAMS];
43d414ba 345 char filename[1024]; /**< input or output filename */
de6d9b64 346 /* stream info */
4568325a 347 int64_t timestamp;
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348 char title[512];
349 char author[512];
350 char copyright[512];
351 char comment[512];
6a58e151 352 char album[512];
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353 int year; /**< ID3 year, 0 if none */
354 int track; /**< track number, 0 if none */
355 char genre[32]; /**< ID3 genre */
6a58e151 356
43d414ba 357 int ctx_flags; /**< format specific flags, see AVFMTCTX_xx */
916c80e9 358 /* private data for pts handling (do not modify directly) */
43d414ba 359 /** This buffer is only needed when packets were already buffered but
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360 not decoded, for example to get the codec parameters in mpeg
361 streams */
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362 struct AVPacketList *packet_buffer;
363
43d414ba 364 /** decoding: position of the first frame of the component, in
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365 AV_TIME_BASE fractional seconds. NEVER set this value directly:
366 it is deduced from the AVStream values. */
115329f1 367 int64_t start_time;
43d414ba 368 /** decoding: duration of the stream, in AV_TIME_BASE fractional
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369 seconds. NEVER set this value directly: it is deduced from the
370 AVStream values. */
371 int64_t duration;
43d414ba 372 /** decoding: total file size. 0 if unknown */
ee404803 373 int64_t file_size;
43d414ba 374 /** decoding: total stream bitrate in bit/s, 0 if not
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375 available. Never set it directly if the file_size and the
376 duration are known as ffmpeg can compute it automatically. */
377 int bit_rate;
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378
379 /* av_read_frame() support */
380 AVStream *cur_st;
381 const uint8_t *cur_ptr;
382 int cur_len;
383 AVPacket cur_pkt;
384
fb2758c8 385 /* av_seek_frame() support */
43d414ba 386 int64_t data_offset; /** offset of the first packet */
fb2758c8 387 int index_built;
115329f1 388
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389 int mux_rate;
390 int packet_size;
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391 int preload;
392 int max_delay;
8108551a 393
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394#define AVFMT_NOOUTPUTLOOP -1
395#define AVFMT_INFINITEOUTPUTLOOP 0
43d414ba 396 /** number of times to loop output in formats that support it */
8108551a 397 int loop_output;
115329f1 398
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399 int flags;
400#define AVFMT_FLAG_GENPTS 0x0001 ///< generate pts if missing even if it requires parsing future frames
2c00106c 401#define AVFMT_FLAG_IGNIDX 0x0002 ///< ignore index
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402
403 int loop_input;
43d414ba 404 /** decoding: size of data to probe; encoding unused */
9e6c9470 405 unsigned int probesize;
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406
407 /**
408 * maximum duration in AV_TIME_BASE units over which the input should be analyzed in av_find_stream_info()
409 */
410 int max_analyze_duration;
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411
412 const uint8_t *key;
413 int keylen;
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414} AVFormatContext;
415
416typedef struct AVPacketList {
417 AVPacket pkt;
418 struct AVPacketList *next;
419} AVPacketList;
420
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421extern AVInputFormat *first_iformat;
422extern AVOutputFormat *first_oformat;
de6d9b64 423
5b6d5596 424enum CodecID av_guess_image2_codec(const char *filename);
290c5fa6 425
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426/* XXX: use automatic init with either ELF sections or C file parser */
427/* modules */
de6d9b64 428
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429#include "rtp.h"
430
431#include "rtsp.h"
432
b9a281db 433/* utils.c */
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434void av_register_input_format(AVInputFormat *format);
435void av_register_output_format(AVOutputFormat *format);
115329f1 436AVOutputFormat *guess_stream_format(const char *short_name,
36ada60c 437 const char *filename, const char *mime_type);
115329f1 438AVOutputFormat *guess_format(const char *short_name,
b9a281db 439 const char *filename, const char *mime_type);
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440
441/**
442 * Guesses the codec id based upon muxer and filename.
443 */
115329f1 444enum CodecID av_guess_codec(AVOutputFormat *fmt, const char *short_name,
5b6d5596 445 const char *filename, const char *mime_type, enum CodecType type);
de6d9b64 446
3217cb42 447/**
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448 * Send a nice hexadecimal dump of a buffer to the specified file stream.
449 *
450 * @param f The file stream pointer where the dump should be sent to.
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451 * @param buf buffer
452 * @param size buffer size
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453 *
454 * @see av_hex_dump_log, av_pkt_dump, av_pkt_dump_log
3217cb42 455 */
fb2758c8 456void av_hex_dump(FILE *f, uint8_t *buf, int size);
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457
458/**
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459 * Send a nice hexadecimal dump of a buffer to the log.
460 *
461 * @param avcl A pointer to an arbitrary struct of which the first field is a
462 * pointer to an AVClass struct.
463 * @param level The importance level of the message, lower values signifying
464 * higher importance.
465 * @param buf buffer
466 * @param size buffer size
467 *
468 * @see av_hex_dump, av_pkt_dump, av_pkt_dump_log
469 */
470void av_hex_dump_log(void *avcl, int level, uint8_t *buf, int size);
471
472/**
473 * Send a nice dump of a packet to the specified file stream.
474 *
475 * @param f The file stream pointer where the dump should be sent to.
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476 * @param pkt packet to dump
477 * @param dump_payload true if the payload must be displayed too
478 */
fb2758c8 479void av_pkt_dump(FILE *f, AVPacket *pkt, int dump_payload);
de6d9b64 480
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481/**
482 * Send a nice dump of a packet to the log.
483 *
484 * @param avcl A pointer to an arbitrary struct of which the first field is a
485 * pointer to an AVClass struct.
486 * @param level The importance level of the message, lower values signifying
487 * higher importance.
488 * @param pkt packet to dump
489 * @param dump_payload true if the payload must be displayed too
490 */
491void av_pkt_dump_log(void *avcl, int level, AVPacket *pkt, int dump_payload);
492
94988531 493void av_register_all(void);
de6d9b64 494
43d414ba 495/** codec tag <-> codec id */
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496enum CodecID av_codec_get_id(const struct AVCodecTag **tags, unsigned int tag);
497unsigned int av_codec_get_tag(const struct AVCodecTag **tags, enum CodecID id);
7caf0cc6 498
b9a281db 499/* media file input */
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500
501/**
502 * finds AVInputFormat based on input format's short name.
503 */
b9a281db 504AVInputFormat *av_find_input_format(const char *short_name);
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505
506/**
507 * Guess file format.
508 *
509 * @param is_opened whether the file is already opened, determines whether
510 * demuxers with or without AVFMT_NOFILE are probed
511 */
94988531 512AVInputFormat *av_probe_input_format(AVProbeData *pd, int is_opened);
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513
514/**
515 * Allocates all the structures needed to read an input stream.
516 * This does not open the needed codecs for decoding the stream[s].
517 */
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518int av_open_input_stream(AVFormatContext **ic_ptr,
519 ByteIOContext *pb, const char *filename,
da24c5e3 520 AVInputFormat *fmt, AVFormatParameters *ap);
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521
522/**
864ff8c1 523 * Open a media file as input. The codecs are not opened. Only the file
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524 * header (if present) is read.
525 *
526 * @param ic_ptr the opened media file handle is put here
527 * @param filename filename to open.
528 * @param fmt if non NULL, force the file format to use
529 * @param buf_size optional buffer size (zero if default is OK)
e42dba48 530 * @param ap additional parameters needed when opening the file (NULL if default)
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531 * @return 0 if OK. AVERROR_xxx otherwise.
532 */
115329f1 533int av_open_input_file(AVFormatContext **ic_ptr, const char *filename,
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534 AVInputFormat *fmt,
535 int buf_size,
536 AVFormatParameters *ap);
43d414ba 537/** no av_open for output, so applications will need this: */
bc874dae 538AVFormatContext *av_alloc_format_context(void);
b9a281db 539
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540/**
541 * Read packets of a media file to get stream information. This
542 * is useful for file formats with no headers such as MPEG. This
543 * function also computes the real frame rate in case of mpeg2 repeat
544 * frame mode.
545 * The logical file position is not changed by this function;
546 * examined packets may be buffered for later processing.
547 *
548 * @param ic media file handle
549 * @return >=0 if OK. AVERROR_xxx if error.
755bfeab 550 * @todo Let user decide somehow what information is needed so we do not waste time geting stuff the user does not need.
3217cb42 551 */
b9a281db 552int av_find_stream_info(AVFormatContext *ic);
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553
554/**
555 * Read a transport packet from a media file.
556 *
864ff8c1 557 * This function is obsolete and should never be used.
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558 * Use av_read_frame() instead.
559 *
560 * @param s media file handle
561 * @param pkt is filled
562 * @return 0 if OK. AVERROR_xxx if error.
563 */
de6d9b64 564int av_read_packet(AVFormatContext *s, AVPacket *pkt);
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565
566/**
567 * Return the next frame of a stream.
568 *
569 * The returned packet is valid
570 * until the next av_read_frame() or until av_close_input_file() and
571 * must be freed with av_free_packet. For video, the packet contains
572 * exactly one frame. For audio, it contains an integer number of
573 * frames if each frame has a known fixed size (e.g. PCM or ADPCM
574 * data). If the audio frames have a variable size (e.g. MPEG audio),
575 * then it contains one frame.
576 *
577 * pkt->pts, pkt->dts and pkt->duration are always set to correct
a050f802 578 * values in AVStream.timebase units (and guessed if the format cannot
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579 * provided them). pkt->pts can be AV_NOPTS_VALUE if the video format
580 * has B frames, so it is better to rely on pkt->dts if you do not
581 * decompress the payload.
582 *
583 * @return 0 if OK, < 0 if error or end of file.
584 */
fb2758c8 585int av_read_frame(AVFormatContext *s, AVPacket *pkt);
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586
587/**
588 * Seek to the key frame at timestamp.
589 * 'timestamp' in 'stream_index'.
590 * @param stream_index If stream_index is (-1), a default
591 * stream is selected, and timestamp is automatically converted
592 * from AV_TIME_BASE units to the stream specific time_base.
593 * @param timestamp timestamp in AVStream.time_base units
594 * or if there is no stream specified then in AV_TIME_BASE units
595 * @param flags flags which select direction and seeking mode
596 * @return >= 0 on success
597 */
3ba1438d 598int av_seek_frame(AVFormatContext *s, int stream_index, int64_t timestamp, int flags);
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599
600/**
601 * start playing a network based stream (e.g. RTSP stream) at the
602 * current position
603 */
fb2758c8 604int av_read_play(AVFormatContext *s);
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605
606/**
607 * Pause a network based stream (e.g. RTSP stream).
608 *
609 * Use av_read_play() to resume it.
610 */
fb2758c8 611int av_read_pause(AVFormatContext *s);
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612
613/**
614 * Close a media file (but not its codecs).
615 *
616 * @param s media file handle
617 */
de6d9b64 618void av_close_input_file(AVFormatContext *s);
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619
620/**
621 * Add a new stream to a media file.
622 *
623 * Can only be called in the read_header() function. If the flag
624 * AVFMTCTX_NOHEADER is in the format context, then new streams
625 * can be added in read_packet too.
626 *
627 * @param s media file handle
628 * @param id file format dependent stream id
629 */
b9a281db 630AVStream *av_new_stream(AVFormatContext *s, int id);
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631
632/**
633 * Set the pts for a given stream.
634 *
635 * @param s stream
636 * @param pts_wrap_bits number of bits effectively used by the pts
637 * (used for wrap control, 33 is the value for MPEG)
638 * @param pts_num numerator to convert to seconds (MPEG: 1)
639 * @param pts_den denominator to convert to seconds (MPEG: 90000)
640 */
9ee91c2f 641void av_set_pts_info(AVStream *s, int pts_wrap_bits,
916c80e9 642 int pts_num, int pts_den);
de6d9b64 643
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644#define AVSEEK_FLAG_BACKWARD 1 ///< seek backward
645#define AVSEEK_FLAG_BYTE 2 ///< seeking based on position in bytes
27a5fe5f 646#define AVSEEK_FLAG_ANY 4 ///< seek to any frame, even non keyframes
3ba1438d 647
b754978a 648int av_find_default_stream_index(AVFormatContext *s);
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649
650/**
651 * Gets the index for a specific timestamp.
652 * @param flags if AVSEEK_FLAG_BACKWARD then the returned index will correspond to
653 * the timestamp which is <= the requested one, if backward is 0
654 * then it will be >=
655 * if AVSEEK_FLAG_ANY seek to any frame, only keyframes otherwise
656 * @return < 0 if no such timestamp could be found
657 */
dc56fc38 658int av_index_search_timestamp(AVStream *st, int64_t timestamp, int flags);
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659
660/**
661 * Add a index entry into a sorted list updateing if it is already there.
662 *
663 * @param timestamp timestamp in the timebase of the given stream
664 */
3e9245a9 665int av_add_index_entry(AVStream *st,
30a43f2d 666 int64_t pos, int64_t timestamp, int size, int distance, int flags);
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667
668/**
669 * Does a binary search using av_index_search_timestamp() and AVCodec.read_timestamp().
755bfeab 670 * This is not supposed to be called directly by a user application, but by demuxers.
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671 * @param target_ts target timestamp in the time base of the given stream
672 * @param stream_index stream number
673 */
3ba1438d 674int av_seek_frame_binary(AVFormatContext *s, int stream_index, int64_t target_ts, int flags);
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675
676/**
677 * Updates cur_dts of all streams based on given timestamp and AVStream.
678 *
679 * Stream ref_st unchanged, others set cur_dts in their native timebase
755bfeab 680 * only needed for timestamp wrapping or if (dts not set and pts!=dts).
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681 * @param timestamp new dts expressed in time_base of param ref_st
682 * @param ref_st reference stream giving time_base of param timestamp
683 */
22ffac70 684void av_update_cur_dts(AVFormatContext *s, AVStream *ref_st, int64_t timestamp);
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685
686/**
687 * Does a binary search using read_timestamp().
755bfeab 688 * This is not supposed to be called directly by a user application, but by demuxers.
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689 * @param target_ts target timestamp in the time base of the given stream
690 * @param stream_index stream number
691 */
89ddd2a9 692int64_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 693
43d414ba 694/** media file output */
290c5fa6 695int av_set_parameters(AVFormatContext *s, AVFormatParameters *ap);
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696
697/**
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698 * Allocate the stream private data and write the stream header to an
699 * output media file.
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700 *
701 * @param s media file handle
702 * @return 0 if OK. AVERROR_xxx if error.
703 */
b9a281db 704int av_write_header(AVFormatContext *s);
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705
706/**
707 * Write a packet to an output media file.
708 *
709 * The packet shall contain one audio or video frame.
710 * The packet must be correctly interleaved according to the container specification,
711 * if not then av_interleaved_write_frame must be used
712 *
713 * @param s media file handle
714 * @param pkt the packet, which contains the stream_index, buf/buf_size, dts/pts, ...
715 * @return < 0 if error, = 0 if OK, 1 if end of stream wanted.
716 */
e928649b 717int av_write_frame(AVFormatContext *s, AVPacket *pkt);
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718
719/**
720 * Writes a packet to an output media file ensuring correct interleaving.
721 *
722 * The packet must contain one audio or video frame.
723 * If the packets are already correctly interleaved the application should
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724 * call av_write_frame() instead as it is slightly faster. It is also important
725 * to keep in mind that completely non-interleaved input will need huge amounts
726 * of memory to interleave with this, so it is preferable to interleave at the
727 * demuxer level.
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728 *
729 * @param s media file handle
730 * @param pkt the packet, which contains the stream_index, buf/buf_size, dts/pts, ...
731 * @return < 0 if error, = 0 if OK, 1 if end of stream wanted.
732 */
3c895fc0 733int av_interleaved_write_frame(AVFormatContext *s, AVPacket *pkt);
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734
735/**
736 * Interleave a packet per DTS in an output media file.
737 *
738 * Packets with pkt->destruct == av_destruct_packet will be freed inside this function,
739 * so they cannot be used after it, note calling av_free_packet() on them is still safe.
740 *
741 * @param s media file handle
742 * @param out the interleaved packet will be output here
743 * @param in the input packet
744 * @param flush 1 if no further packets are available as input and all
745 * remaining packets should be output
746 * @return 1 if a packet was output, 0 if no packet could be output,
747 * < 0 if an error occured
748 */
f21c0b4c 749int av_interleave_packet_per_dts(AVFormatContext *s, AVPacket *out, AVPacket *pkt, int flush);
e928649b 750
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751/**
752 * @brief Write the stream trailer to an output media file and
753 * free the file private data.
754 *
755 * @param s media file handle
756 * @return 0 if OK. AVERROR_xxx if error.
757 */
b9a281db 758int av_write_trailer(AVFormatContext *s);
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759
760void dump_format(AVFormatContext *ic,
115329f1 761 int index,
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762 const char *url,
763 int is_output);
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764
765/**
766 * parses width and height out of string str.
26ef3220 767 * @deprecated Use av_parse_video_frame_size instead.
3217cb42 768 */
26ef3220 769attribute_deprecated int parse_image_size(int *width_ptr, int *height_ptr, const char *str);
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770
771/**
772 * Converts frame rate from string to a fraction.
26ef3220 773 * @deprecated Use av_parse_video_frame_rate instead.
3217cb42 774 */
26ef3220 775attribute_deprecated int parse_frame_rate(int *frame_rate, int *frame_rate_base, const char *arg);
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776
777/**
778 * Converts date string to number of seconds since Jan 1st, 1970.
779 *
780 * @code
781 * Syntax:
782 * - If not a duration:
783 * [{YYYY-MM-DD|YYYYMMDD}]{T| }{HH[:MM[:SS[.m...]]][Z]|HH[MM[SS[.m...]]][Z]}
784 * Time is localtime unless Z is suffixed to the end. In this case GMT
785 * Return the date in micro seconds since 1970
786 *
787 * - If a duration:
788 * HH[:MM[:SS[.m...]]]
789 * S+[.m...]
790 * @endcode
791 */
0c1a9eda 792int64_t parse_date(const char *datestr, int duration);
de6d9b64 793
0c1a9eda 794int64_t av_gettime(void);
94988531 795
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796/* ffm specific for ffserver */
797#define FFM_PACKET_SIZE 4096
798offset_t ffm_read_write_index(int fd);
799void ffm_write_write_index(int fd, offset_t pos);
800void ffm_set_write_index(AVFormatContext *s, offset_t pos, offset_t file_size);
801
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802/**
803 * Attempts to find a specific tag in a URL.
804 *
805 * syntax: '?tag1=val1&tag2=val2...'. Little URL decoding is done.
806 * Return 1 if found.
807 */
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808int find_info_tag(char *arg, int arg_size, const char *tag1, const char *info);
809
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810/**
811 * Returns in 'buf' the path with '%d' replaced by number.
812
813 * Also handles the '%0nd' format where 'n' is the total number
814 * of digits and '%%'.
815 *
816 * @param buf destination buffer
817 * @param buf_size destination buffer size
818 * @param path numbered sequence string
819 * @number frame number
820 * @return 0 if OK, -1 if format error.
821 */
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822int av_get_frame_filename(char *buf, int buf_size,
823 const char *path, int number);
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824
825/**
826 * Check whether filename actually is a numbered sequence generator.
827 *
828 * @param filename possible numbered sequence string
829 * @return 1 if a valid numbered sequence string, 0 otherwise.
830 */
5c07cf53 831int av_filename_number_test(const char *filename);
96baaa6a 832
fb025625 833#ifdef HAVE_AV_CONFIG_H
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834
835#include "os_support.h"
836
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837void __dynarray_add(unsigned long **tab_ptr, int *nb_ptr, unsigned long elem);
838
e4e70d2e 839#ifdef __GNUC__
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840#define dynarray_add(tab, nb_ptr, elem)\
841do {\
842 typeof(tab) _tab = (tab);\
843 typeof(elem) _elem = (elem);\
844 (void)sizeof(**_tab == _elem); /* check that types are compatible */\
845 __dynarray_add((unsigned long **)_tab, nb_ptr, (unsigned long)_elem);\
846} while(0)
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847#else
848#define dynarray_add(tab, nb_ptr, elem)\
849do {\
850 __dynarray_add((unsigned long **)(tab), nb_ptr, (unsigned long)(elem));\
851} while(0)
852#endif
39f472c3 853
f71869a4 854time_t mktimegm(struct tm *tm);
0c9fc6e1 855struct tm *brktimegm(time_t secs, struct tm *tm);
115329f1 856const char *small_strptime(const char *p, const char *fmt,
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857 struct tm *dt);
858
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859struct in_addr;
860int resolve_host(struct in_addr *sin_addr, const char *hostname);
861
862void url_split(char *proto, int proto_size,
6ba5cbc6 863 char *authorization, int authorization_size,
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864 char *hostname, int hostname_size,
865 int *port_ptr,
866 char *path, int path_size,
867 const char *url);
868
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869int match_ext(const char *filename, const char *extensions);
870
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871#endif /* HAVE_AV_CONFIG_H */
872
873#endif /* AVFORMAT_H */
f3356e9c 874