Make the declaration of AVInputFormat ac3_demuxer conditional
[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#ifdef __cplusplus
25extern "C" {
26#endif
27
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28#define LIBAVFORMAT_VERSION_INT ((51<<16)+(12<<8)+1)
29#define LIBAVFORMAT_VERSION 51.12.1
5aa083ee 30#define LIBAVFORMAT_BUILD LIBAVFORMAT_VERSION_INT
8026c3b5 31
5aa083ee 32#define LIBAVFORMAT_IDENT "Lavf" AV_STRINGIFY(LIBAVFORMAT_VERSION)
4b1f4f23 33
f71869a4 34#include <time.h>
67070e4f 35#include <stdio.h> /* FILE */
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36#include "avcodec.h"
37
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38#include "avio.h"
39
40/* packet functions */
41
42typedef struct AVPacket {
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43 int64_t pts; ///< presentation time stamp in time_base units
44 int64_t dts; ///< decompression time stamp in time_base units
0c1a9eda 45 uint8_t *data;
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46 int size;
47 int stream_index;
48 int flags;
2692067a 49 int duration; ///< presentation duration in time_base units (0 if not available)
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50 void (*destruct)(struct AVPacket *);
51 void *priv;
2692067a 52 int64_t pos; ///< byte position in stream, -1 if unknown
115329f1 53} AVPacket;
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54#define PKT_FLAG_KEY 0x0001
55
63dd1377 56void av_destruct_packet_nofree(AVPacket *pkt);
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57
58/**
59 * Default packet destructor.
60 */
90ad92b3 61void av_destruct_packet(AVPacket *pkt);
63dd1377 62
da24c5e3 63/* initialize optional fields of a packet */
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64static inline void av_init_packet(AVPacket *pkt)
65{
66 pkt->pts = AV_NOPTS_VALUE;
fb2758c8 67 pkt->dts = AV_NOPTS_VALUE;
2692067a 68 pkt->pos = -1;
fb2758c8 69 pkt->duration = 0;
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70 pkt->flags = 0;
71 pkt->stream_index = 0;
63dd1377 72 pkt->destruct= av_destruct_packet_nofree;
6fa5a56c 73}
de6d9b64 74
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75/**
76 * Allocate the payload of a packet and intialized its fields to default values.
77 *
78 * @param pkt packet
79 * @param size wanted payload size
80 * @return 0 if OK. AVERROR_xxx otherwise.
81 */
de6d9b64 82int av_new_packet(AVPacket *pkt, int size);
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83
84/**
85 * Allocate and read the payload of a packet and intialized its fields to default values.
86 *
87 * @param pkt packet
88 * @param size wanted payload size
89 * @return >0 (read size) if OK. AVERROR_xxx otherwise.
90 */
2692067a 91int av_get_packet(ByteIOContext *s, AVPacket *pkt, int size);
3217cb42 92
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93/**
94 * @warning This is a hack - the packet memory allocation stuff is broken. The
95 * packet is allocated if it was not really allocated
96 */
fb2758c8 97int av_dup_packet(AVPacket *pkt);
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98
99/**
100 * Free a packet
101 *
102 * @param pkt packet to free
103 */
104static inline void av_free_packet(AVPacket *pkt)
105{
342474ab 106 if (pkt && pkt->destruct) {
bb270c08 107 pkt->destruct(pkt);
342474ab 108 }
6fa5a56c 109}
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110
111/*************************************************/
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112/* fractional numbers for exact pts handling */
113
114/* the exact value of the fractional number is: 'val + num / den'. num
115 is assumed to be such as 0 <= num < den */
116typedef struct AVFrac {
115329f1 117 int64_t val, num, den;
955ab9a4 118} AVFrac attribute_deprecated;
916c80e9 119
916c80e9 120/*************************************************/
b9a281db 121/* input/output formats */
de6d9b64 122
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123struct AVCodecTag;
124
de6d9b64 125struct AVFormatContext;
b9a281db 126
43d414ba 127/** this structure contains the data a format has to probe a file */
b9a281db 128typedef struct AVProbeData {
5c91a675 129 const char *filename;
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130 unsigned char *buf;
131 int buf_size;
132} AVProbeData;
133
0288a747 134#define AVPROBE_SCORE_MAX 100 ///< max score, half of that is used for file extension based detection
87e87886 135#define AVPROBE_PADDING_SIZE 32 ///< extra allocated bytes at the end of the probe buffer
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136
137typedef struct AVFormatParameters {
c0df9d75 138 AVRational time_base;
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139 int sample_rate;
140 int channels;
141 int width;
142 int height;
4606ac8d 143 enum PixelFormat pix_fmt;
43d414ba 144 int channel; /**< used to select dv channel */
cc58300e 145#if LIBAVFORMAT_VERSION_INT < (52<<16)
43d414ba 146 const char *device; /**< video, audio or DV device */
cc58300e 147#endif
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148 const char *standard; /**< tv standard, NTSC, PAL, SECAM */
149 int mpeg2ts_raw:1; /**< force raw MPEG2 transport stream output, if possible */
150 int mpeg2ts_compute_pcr:1; /**< compute exact PCR for each transport
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151 stream packet (only meaningful if
152 mpeg2ts_raw is TRUE */
43d414ba 153 int initial_pause:1; /**< do not begin to play the stream
fb2758c8 154 immediately (RTSP only) */
4eb72c6b 155 int prealloced_context:1;
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156 enum CodecID video_codec_id;
157 enum CodecID audio_codec_id;
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158} AVFormatParameters;
159
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160//! demuxer will use url_fopen, no opened file should be provided by the caller
161#define AVFMT_NOFILE 0x0001
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162#define AVFMT_NEEDNUMBER 0x0002 /**< needs '%d' in filename */
163#define AVFMT_SHOW_IDS 0x0008 /**< show format stream IDs numbers */
164#define AVFMT_RAWPICTURE 0x0020 /**< format wants AVPicture structure for
fb025625 165 raw picture data */
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166#define AVFMT_GLOBALHEADER 0x0040 /**< format wants global header */
167#define AVFMT_NOTIMESTAMPS 0x0080 /**< format doesnt need / has any timestamps */
168#define AVFMT_GENERIC_INDEX 0x0100 /**< use generic index building code */
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169
170typedef struct AVOutputFormat {
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171 const char *name;
172 const char *long_name;
173 const char *mime_type;
cf29452b 174 const char *extensions; /**< comma separated filename extensions */
43d414ba 175 /** size of private data so that it can be allocated in the wrapper */
b9a281db 176 int priv_data_size;
de6d9b64 177 /* output support */
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178 enum CodecID audio_codec; /**< default audio codec */
179 enum CodecID video_codec; /**< default video codec */
de6d9b64 180 int (*write_header)(struct AVFormatContext *);
e928649b 181 int (*write_packet)(struct AVFormatContext *, AVPacket *pkt);
de6d9b64 182 int (*write_trailer)(struct AVFormatContext *);
43d414ba 183 /** can use flags: AVFMT_NOFILE, AVFMT_NEEDNUMBER, AVFMT_GLOBALHEADER */
b9a281db 184 int flags;
43d414ba 185 /** currently only used to set pixel format if not YUV420P */
290c5fa6 186 int (*set_parameters)(struct AVFormatContext *, AVFormatParameters *);
fe2d6fe2 187 int (*interleave_packet)(struct AVFormatContext *, AVPacket *out, AVPacket *in, int flush);
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188
189 /**
190 * list of supported codec_id-codec_tag pairs, ordered by "better choice first"
191 * the arrays are all CODEC_ID_NONE terminated
192 */
6c77805f 193 const struct AVCodecTag **codec_tag;
7caf0cc6 194
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195 /* private fields */
196 struct AVOutputFormat *next;
197} AVOutputFormat;
de6d9b64 198
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199typedef struct AVInputFormat {
200 const char *name;
201 const char *long_name;
43d414ba 202 /** size of private data so that it can be allocated in the wrapper */
b9a281db 203 int priv_data_size;
43d414ba 204 /** tell if a given file has a chance of being parsing by this format */
b9a281db 205 int (*read_probe)(AVProbeData *);
43d414ba 206 /** read the format header and initialize the AVFormatContext
de6d9b64 207 structure. Return 0 if OK. 'ap' if non NULL contains
e42dba48 208 additional paramters. Only used in raw format right
b9a281db 209 now. 'av_new_stream' should be called to create new streams. */
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210 int (*read_header)(struct AVFormatContext *,
211 AVFormatParameters *ap);
43d414ba 212 /** read one packet and put it in 'pkt'. pts and flags are also
b9a281db 213 set. 'av_new_stream' can be called only if the flag
da24c5e3 214 AVFMTCTX_NOHEADER is used. */
de6d9b64 215 int (*read_packet)(struct AVFormatContext *, AVPacket *pkt);
43d414ba 216 /** close the stream. The AVFormatContext and AVStreams are not
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217 freed by this function */
218 int (*read_close)(struct AVFormatContext *);
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219 /**
220 * seek to a given timestamp relative to the frames in
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221 * stream component stream_index
222 * @param stream_index must not be -1
115329f1 223 * @param flags selects which direction should be preferred if no exact
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224 * match is available
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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256typedef struct AVIndexEntry {
257 int64_t pos;
258 int64_t timestamp;
259#define AVINDEX_KEYFRAME 0x0001
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260 int flags:2;
261 int size:30; //yeah trying to keep the size of this small to reduce memory requirements (its 24 vs 32 byte due to possible 8byte align)
43d414ba 262 int min_distance; /**< min distance between this and the previous keyframe, used to avoid unneeded searching */
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263} AVIndexEntry;
264
de6d9b64 265typedef struct AVStream {
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266 int index; /**< stream index in AVFormatContext */
267 int id; /**< format specific stream id */
268 AVCodecContext *codec; /**< codec context */
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269 /**
270 * real base frame rate of the stream.
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271 * this is the lowest framerate with which all timestamps can be
272 * represented accurately (its the least common multiple of all
273 * framerates in the stream), Note, this value is just a guess!
115329f1 274 * for example if the timebase is 1/90000 and all frames have either
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275 * approximately 3600 or 1800 timer ticks then r_frame_rate will be 50/1
276 */
277 AVRational r_frame_rate;
de6d9b64 278 void *priv_data;
ea486ab3 279#if LIBAVFORMAT_VERSION_INT < (52<<16)
b9a281db 280 /* internal data used in av_find_stream_info() */
115329f1 281 int64_t codec_info_duration;
fb2758c8 282 int codec_info_nb_frames;
ea486ab3 283#endif
43d414ba 284 /** encoding: PTS generation when outputing stream */
1e51d801 285 AVFrac pts;
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286
287 /**
288 * this is the fundamental unit of time (in seconds) in terms
289 * of which frame timestamps are represented. for fixed-fps content,
290 * timebase should be 1/framerate and timestamp increments should be
291 * identically 1.
292 */
9ee91c2f 293 AVRational time_base;
43d414ba 294 int pts_wrap_bits; /**< number of bits in pts (used for wrapping control) */
a48b7a6b 295 /* ffmpeg.c private use */
15786dc4 296 int stream_copy; /**< if set, just copy stream */
f3356e9c 297 enum AVDiscard discard; ///< selects which packets can be discarded at will and dont need to be demuxed
b4aea108 298 //FIXME move stuff to a flags field?
43d414ba 299 /** quality, as it has been removed from AVCodecContext and put in AVVideoFrame
1e491e29 300 * MN:dunno if thats the right place, for it */
115329f1 301 float quality;
43d414ba 302 /** decoding: position of the first frame of the component, in
ee404803 303 AV_TIME_BASE fractional seconds. */
115329f1 304 int64_t start_time;
43d414ba 305 /** decoding: duration of the stream, in AV_TIME_BASE fractional
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306 seconds. */
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 */
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312#define AVSTREAM_PARSE_TIMESTAMPS 3 /**< full parsing and interpolation of timestamps for frames not starting on packet boundary */
313 int need_parsing; ///< 1->full parsing needed, 2->only parse headers dont repack, 3->full parsing and interpolate timestamps
fb2758c8 314 struct AVCodecParserContext *parser;
6ec87caa 315
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316 int64_t cur_dts;
317 int last_IP_duration;
77405fc8 318 int64_t last_IP_pts;
fb2758c8 319 /* av_seek_frame() support */
43d414ba 320 AVIndexEntry *index_entries; /**< only used if the format does not
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321 support seeking natively */
322 int nb_index_entries;
191e8ca7 323 unsigned int index_entries_allocated_size;
115329f1 324
b4b87d48 325 int64_t nb_frames; ///< number of frames in this stream if known or 0
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326
327#define MAX_REORDER_DELAY 4
328 int64_t pts_buffer[MAX_REORDER_DELAY+1];
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329} AVStream;
330
43d414ba 331#define AVFMTCTX_NOHEADER 0x0001 /**< signal that no header is present
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332 (streams are added dynamically) */
333
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334#define MAX_STREAMS 20
335
336/* format I/O context */
337typedef struct AVFormatContext {
43d414ba 338 const AVClass *av_class; /**< set by av_alloc_format_context */
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339 /* can only be iformat or oformat, not both at the same time */
340 struct AVInputFormat *iformat;
341 struct AVOutputFormat *oformat;
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342 void *priv_data;
343 ByteIOContext pb;
db69c2e5 344 unsigned int nb_streams;
de6d9b64 345 AVStream *streams[MAX_STREAMS];
43d414ba 346 char filename[1024]; /**< input or output filename */
de6d9b64 347 /* stream info */
4568325a 348 int64_t timestamp;
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349 char title[512];
350 char author[512];
351 char copyright[512];
352 char comment[512];
6a58e151 353 char album[512];
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354 int year; /**< ID3 year, 0 if none */
355 int track; /**< track number, 0 if none */
356 char genre[32]; /**< ID3 genre */
6a58e151 357
43d414ba 358 int ctx_flags; /**< format specific flags, see AVFMTCTX_xx */
916c80e9 359 /* private data for pts handling (do not modify directly) */
43d414ba 360 /** This buffer is only needed when packets were already buffered but
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361 not decoded, for example to get the codec parameters in mpeg
362 streams */
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363 struct AVPacketList *packet_buffer;
364
43d414ba 365 /** decoding: position of the first frame of the component, in
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366 AV_TIME_BASE fractional seconds. NEVER set this value directly:
367 it is deduced from the AVStream values. */
115329f1 368 int64_t start_time;
43d414ba 369 /** decoding: duration of the stream, in AV_TIME_BASE fractional
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370 seconds. NEVER set this value directly: it is deduced from the
371 AVStream values. */
372 int64_t duration;
43d414ba 373 /** decoding: total file size. 0 if unknown */
ee404803 374 int64_t file_size;
43d414ba 375 /** decoding: total stream bitrate in bit/s, 0 if not
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376 available. Never set it directly if the file_size and the
377 duration are known as ffmpeg can compute it automatically. */
378 int bit_rate;
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379
380 /* av_read_frame() support */
381 AVStream *cur_st;
382 const uint8_t *cur_ptr;
383 int cur_len;
384 AVPacket cur_pkt;
385
fb2758c8 386 /* av_seek_frame() support */
43d414ba 387 int64_t data_offset; /** offset of the first packet */
fb2758c8 388 int index_built;
115329f1 389
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390 int mux_rate;
391 int packet_size;
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392 int preload;
393 int max_delay;
8108551a 394
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395#define AVFMT_NOOUTPUTLOOP -1
396#define AVFMT_INFINITEOUTPUTLOOP 0
43d414ba 397 /** number of times to loop output in formats that support it */
8108551a 398 int loop_output;
115329f1 399
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400 int flags;
401#define AVFMT_FLAG_GENPTS 0x0001 ///< generate pts if missing even if it requires parsing future frames
2c00106c 402#define AVFMT_FLAG_IGNIDX 0x0002 ///< ignore index
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403
404 int loop_input;
43d414ba 405 /** decoding: size of data to probe; encoding unused */
9e6c9470 406 unsigned int probesize;
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407
408 /**
409 * maximum duration in AV_TIME_BASE units over which the input should be analyzed in av_find_stream_info()
410 */
411 int max_analyze_duration;
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412
413 const uint8_t *key;
414 int keylen;
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415} AVFormatContext;
416
417typedef struct AVPacketList {
418 AVPacket pkt;
419 struct AVPacketList *next;
420} AVPacketList;
421
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422extern AVInputFormat *first_iformat;
423extern AVOutputFormat *first_oformat;
de6d9b64 424
5b6d5596 425enum CodecID av_guess_image2_codec(const char *filename);
290c5fa6 426
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427/* XXX: use automatic init with either ELF sections or C file parser */
428/* modules */
de6d9b64 429
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430#include "rtp.h"
431
432#include "rtsp.h"
433
b9a281db 434/* utils.c */
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435void av_register_input_format(AVInputFormat *format);
436void av_register_output_format(AVOutputFormat *format);
115329f1 437AVOutputFormat *guess_stream_format(const char *short_name,
36ada60c 438 const char *filename, const char *mime_type);
115329f1 439AVOutputFormat *guess_format(const char *short_name,
b9a281db 440 const char *filename, const char *mime_type);
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441
442/**
443 * Guesses the codec id based upon muxer and filename.
444 */
115329f1 445enum CodecID av_guess_codec(AVOutputFormat *fmt, const char *short_name,
5b6d5596 446 const char *filename, const char *mime_type, enum CodecType type);
de6d9b64 447
3217cb42 448/**
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449 * Send a nice hexadecimal dump of a buffer to the specified file stream.
450 *
451 * @param f The file stream pointer where the dump should be sent to.
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452 * @param buf buffer
453 * @param size buffer size
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454 *
455 * @see av_hex_dump_log, av_pkt_dump, av_pkt_dump_log
3217cb42 456 */
fb2758c8 457void av_hex_dump(FILE *f, uint8_t *buf, int size);
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458
459/**
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460 * Send a nice hexadecimal dump of a buffer to the log.
461 *
462 * @param avcl A pointer to an arbitrary struct of which the first field is a
463 * pointer to an AVClass struct.
464 * @param level The importance level of the message, lower values signifying
465 * higher importance.
466 * @param buf buffer
467 * @param size buffer size
468 *
469 * @see av_hex_dump, av_pkt_dump, av_pkt_dump_log
470 */
471void av_hex_dump_log(void *avcl, int level, uint8_t *buf, int size);
472
473/**
474 * Send a nice dump of a packet to the specified file stream.
475 *
476 * @param f The file stream pointer where the dump should be sent to.
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477 * @param pkt packet to dump
478 * @param dump_payload true if the payload must be displayed too
479 */
fb2758c8 480void av_pkt_dump(FILE *f, AVPacket *pkt, int dump_payload);
de6d9b64 481
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482/**
483 * Send a nice dump of a packet to the log.
484 *
485 * @param avcl A pointer to an arbitrary struct of which the first field is a
486 * pointer to an AVClass struct.
487 * @param level The importance level of the message, lower values signifying
488 * higher importance.
489 * @param pkt packet to dump
490 * @param dump_payload true if the payload must be displayed too
491 */
492void av_pkt_dump_log(void *avcl, int level, AVPacket *pkt, int dump_payload);
493
94988531 494void av_register_all(void);
de6d9b64 495
43d414ba 496/** codec tag <-> codec id */
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497enum CodecID av_codec_get_id(const struct AVCodecTag **tags, unsigned int tag);
498unsigned int av_codec_get_tag(const struct AVCodecTag **tags, enum CodecID id);
7caf0cc6 499
b9a281db 500/* media file input */
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501
502/**
503 * finds AVInputFormat based on input format's short name.
504 */
b9a281db 505AVInputFormat *av_find_input_format(const char *short_name);
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506
507/**
508 * Guess file format.
509 *
510 * @param is_opened whether the file is already opened, determines whether
511 * demuxers with or without AVFMT_NOFILE are probed
512 */
94988531 513AVInputFormat *av_probe_input_format(AVProbeData *pd, int is_opened);
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514
515/**
516 * Allocates all the structures needed to read an input stream.
517 * This does not open the needed codecs for decoding the stream[s].
518 */
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519int av_open_input_stream(AVFormatContext **ic_ptr,
520 ByteIOContext *pb, const char *filename,
da24c5e3 521 AVInputFormat *fmt, AVFormatParameters *ap);
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522
523/**
524 * Open a media file as input. The codec are not opened. Only the file
525 * header (if present) is read.
526 *
527 * @param ic_ptr the opened media file handle is put here
528 * @param filename filename to open.
529 * @param fmt if non NULL, force the file format to use
530 * @param buf_size optional buffer size (zero if default is OK)
e42dba48 531 * @param ap additional parameters needed when opening the file (NULL if default)
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532 * @return 0 if OK. AVERROR_xxx otherwise.
533 */
115329f1 534int av_open_input_file(AVFormatContext **ic_ptr, const char *filename,
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535 AVInputFormat *fmt,
536 int buf_size,
537 AVFormatParameters *ap);
43d414ba 538/** no av_open for output, so applications will need this: */
bc874dae 539AVFormatContext *av_alloc_format_context(void);
b9a281db 540
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541/**
542 * Read packets of a media file to get stream information. This
543 * is useful for file formats with no headers such as MPEG. This
544 * function also computes the real frame rate in case of mpeg2 repeat
545 * frame mode.
546 * The logical file position is not changed by this function;
547 * examined packets may be buffered for later processing.
548 *
549 * @param ic media file handle
550 * @return >=0 if OK. AVERROR_xxx if error.
551 * @todo let user decide somehow what information is needed so we dont waste time geting stuff the user doesnt need
552 */
b9a281db 553int av_find_stream_info(AVFormatContext *ic);
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554
555/**
556 * Read a transport packet from a media file.
557 *
558 * This function is absolete and should never be used.
559 * Use av_read_frame() instead.
560 *
561 * @param s media file handle
562 * @param pkt is filled
563 * @return 0 if OK. AVERROR_xxx if error.
564 */
de6d9b64 565int av_read_packet(AVFormatContext *s, AVPacket *pkt);
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566
567/**
568 * Return the next frame of a stream.
569 *
570 * The returned packet is valid
571 * until the next av_read_frame() or until av_close_input_file() and
572 * must be freed with av_free_packet. For video, the packet contains
573 * exactly one frame. For audio, it contains an integer number of
574 * frames if each frame has a known fixed size (e.g. PCM or ADPCM
575 * data). If the audio frames have a variable size (e.g. MPEG audio),
576 * then it contains one frame.
577 *
578 * pkt->pts, pkt->dts and pkt->duration are always set to correct
a050f802 579 * values in AVStream.timebase units (and guessed if the format cannot
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580 * provided them). pkt->pts can be AV_NOPTS_VALUE if the video format
581 * has B frames, so it is better to rely on pkt->dts if you do not
582 * decompress the payload.
583 *
584 * @return 0 if OK, < 0 if error or end of file.
585 */
fb2758c8 586int av_read_frame(AVFormatContext *s, AVPacket *pkt);
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587
588/**
589 * Seek to the key frame at timestamp.
590 * 'timestamp' in 'stream_index'.
591 * @param stream_index If stream_index is (-1), a default
592 * stream is selected, and timestamp is automatically converted
593 * from AV_TIME_BASE units to the stream specific time_base.
594 * @param timestamp timestamp in AVStream.time_base units
595 * or if there is no stream specified then in AV_TIME_BASE units
596 * @param flags flags which select direction and seeking mode
597 * @return >= 0 on success
598 */
3ba1438d 599int av_seek_frame(AVFormatContext *s, int stream_index, int64_t timestamp, int flags);
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600
601/**
602 * start playing a network based stream (e.g. RTSP stream) at the
603 * current position
604 */
fb2758c8 605int av_read_play(AVFormatContext *s);
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606
607/**
608 * Pause a network based stream (e.g. RTSP stream).
609 *
610 * Use av_read_play() to resume it.
611 */
fb2758c8 612int av_read_pause(AVFormatContext *s);
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613
614/**
615 * Close a media file (but not its codecs).
616 *
617 * @param s media file handle
618 */
de6d9b64 619void av_close_input_file(AVFormatContext *s);
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620
621/**
622 * Add a new stream to a media file.
623 *
624 * Can only be called in the read_header() function. If the flag
625 * AVFMTCTX_NOHEADER is in the format context, then new streams
626 * can be added in read_packet too.
627 *
628 * @param s media file handle
629 * @param id file format dependent stream id
630 */
b9a281db 631AVStream *av_new_stream(AVFormatContext *s, int id);
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632
633/**
634 * Set the pts for a given stream.
635 *
636 * @param s stream
637 * @param pts_wrap_bits number of bits effectively used by the pts
638 * (used for wrap control, 33 is the value for MPEG)
639 * @param pts_num numerator to convert to seconds (MPEG: 1)
640 * @param pts_den denominator to convert to seconds (MPEG: 90000)
641 */
9ee91c2f 642void av_set_pts_info(AVStream *s, int pts_wrap_bits,
916c80e9 643 int pts_num, int pts_den);
de6d9b64 644
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645#define AVSEEK_FLAG_BACKWARD 1 ///< seek backward
646#define AVSEEK_FLAG_BYTE 2 ///< seeking based on position in bytes
27a5fe5f 647#define AVSEEK_FLAG_ANY 4 ///< seek to any frame, even non keyframes
3ba1438d 648
b754978a 649int av_find_default_stream_index(AVFormatContext *s);
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650
651/**
652 * Gets the index for a specific timestamp.
653 * @param flags if AVSEEK_FLAG_BACKWARD then the returned index will correspond to
654 * the timestamp which is <= the requested one, if backward is 0
655 * then it will be >=
656 * if AVSEEK_FLAG_ANY seek to any frame, only keyframes otherwise
657 * @return < 0 if no such timestamp could be found
658 */
dc56fc38 659int av_index_search_timestamp(AVStream *st, int64_t timestamp, int flags);
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660
661/**
662 * Add a index entry into a sorted list updateing if it is already there.
663 *
664 * @param timestamp timestamp in the timebase of the given stream
665 */
3e9245a9 666int av_add_index_entry(AVStream *st,
30a43f2d 667 int64_t pos, int64_t timestamp, int size, int distance, int flags);
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668
669/**
670 * Does a binary search using av_index_search_timestamp() and AVCodec.read_timestamp().
671 * this isnt supposed to be called directly by a user application, but by demuxers
672 * @param target_ts target timestamp in the time base of the given stream
673 * @param stream_index stream number
674 */
3ba1438d 675int av_seek_frame_binary(AVFormatContext *s, int stream_index, int64_t target_ts, int flags);
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676
677/**
678 * Updates cur_dts of all streams based on given timestamp and AVStream.
679 *
680 * Stream ref_st unchanged, others set cur_dts in their native timebase
681 * only needed for timestamp wrapping or if (dts not set and pts!=dts)
682 * @param timestamp new dts expressed in time_base of param ref_st
683 * @param ref_st reference stream giving time_base of param timestamp
684 */
22ffac70 685void av_update_cur_dts(AVFormatContext *s, AVStream *ref_st, int64_t timestamp);
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686
687/**
688 * Does a binary search using read_timestamp().
689 * this isnt supposed to be called directly by a user application, but by demuxers
690 * @param target_ts target timestamp in the time base of the given stream
691 * @param stream_index stream number
692 */
89ddd2a9 693int64_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 694
43d414ba 695/** media file output */
290c5fa6 696int av_set_parameters(AVFormatContext *s, AVFormatParameters *ap);
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697
698/**
699 * allocate the stream private data and write the stream header to an
700 * output media file
701 *
702 * @param s media file handle
703 * @return 0 if OK. AVERROR_xxx if error.
704 */
b9a281db 705int av_write_header(AVFormatContext *s);
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706
707/**
708 * Write a packet to an output media file.
709 *
710 * The packet shall contain one audio or video frame.
711 * The packet must be correctly interleaved according to the container specification,
712 * if not then av_interleaved_write_frame must be used
713 *
714 * @param s media file handle
715 * @param pkt the packet, which contains the stream_index, buf/buf_size, dts/pts, ...
716 * @return < 0 if error, = 0 if OK, 1 if end of stream wanted.
717 */
e928649b 718int av_write_frame(AVFormatContext *s, AVPacket *pkt);
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719
720/**
721 * Writes a packet to an output media file ensuring correct interleaving.
722 *
723 * The packet must contain one audio or video frame.
724 * If the packets are already correctly interleaved the application should
725 * call av_write_frame() instead as its slightly faster, its also important
726 * to keep in mind that completly non interleaved input will need huge amounts
727 * of memory to interleave with this, so its prefereable to interleave at the
728 * demuxer level
729 *
730 * @param s media file handle
731 * @param pkt the packet, which contains the stream_index, buf/buf_size, dts/pts, ...
732 * @return < 0 if error, = 0 if OK, 1 if end of stream wanted.
733 */
3c895fc0 734int av_interleaved_write_frame(AVFormatContext *s, AVPacket *pkt);
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735
736/**
737 * Interleave a packet per DTS in an output media file.
738 *
739 * Packets with pkt->destruct == av_destruct_packet will be freed inside this function,
740 * so they cannot be used after it, note calling av_free_packet() on them is still safe.
741 *
742 * @param s media file handle
743 * @param out the interleaved packet will be output here
744 * @param in the input packet
745 * @param flush 1 if no further packets are available as input and all
746 * remaining packets should be output
747 * @return 1 if a packet was output, 0 if no packet could be output,
748 * < 0 if an error occured
749 */
f21c0b4c 750int av_interleave_packet_per_dts(AVFormatContext *s, AVPacket *out, AVPacket *pkt, int flush);
e928649b 751
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752/**
753 * @brief Write the stream trailer to an output media file and
754 * free the file private data.
755 *
756 * @param s media file handle
757 * @return 0 if OK. AVERROR_xxx if error.
758 */
b9a281db 759int av_write_trailer(AVFormatContext *s);
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760
761void dump_format(AVFormatContext *ic,
115329f1 762 int index,
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763 const char *url,
764 int is_output);
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765
766/**
767 * parses width and height out of string str.
768 */
de6d9b64 769int 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.
3217cb42 773 */
445f1b83 774int parse_frame_rate(int *frame_rate, int *frame_rate_base, const char *arg);
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775
776/**
777 * Converts date string to number of seconds since Jan 1st, 1970.
778 *
779 * @code
780 * Syntax:
781 * - If not a duration:
782 * [{YYYY-MM-DD|YYYYMMDD}]{T| }{HH[:MM[:SS[.m...]]][Z]|HH[MM[SS[.m...]]][Z]}
783 * Time is localtime unless Z is suffixed to the end. In this case GMT
784 * Return the date in micro seconds since 1970
785 *
786 * - If a duration:
787 * HH[:MM[:SS[.m...]]]
788 * S+[.m...]
789 * @endcode
790 */
0c1a9eda 791int64_t parse_date(const char *datestr, int duration);
de6d9b64 792
0c1a9eda 793int64_t av_gettime(void);
94988531 794
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795/* ffm specific for ffserver */
796#define FFM_PACKET_SIZE 4096
797offset_t ffm_read_write_index(int fd);
798void ffm_write_write_index(int fd, offset_t pos);
799void ffm_set_write_index(AVFormatContext *s, offset_t pos, offset_t file_size);
800
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801/**
802 * Attempts to find a specific tag in a URL.
803 *
804 * syntax: '?tag1=val1&tag2=val2...'. Little URL decoding is done.
805 * Return 1 if found.
806 */
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807int find_info_tag(char *arg, int arg_size, const char *tag1, const char *info);
808
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809/**
810 * Returns in 'buf' the path with '%d' replaced by number.
811
812 * Also handles the '%0nd' format where 'n' is the total number
813 * of digits and '%%'.
814 *
815 * @param buf destination buffer
816 * @param buf_size destination buffer size
817 * @param path numbered sequence string
818 * @number frame number
819 * @return 0 if OK, -1 if format error.
820 */
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821int av_get_frame_filename(char *buf, int buf_size,
822 const char *path, int number);
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823
824/**
825 * Check whether filename actually is a numbered sequence generator.
826 *
827 * @param filename possible numbered sequence string
828 * @return 1 if a valid numbered sequence string, 0 otherwise.
829 */
5c07cf53 830int av_filename_number_test(const char *filename);
96baaa6a 831
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832/* grab specific */
833int video_grab_init(void);
834int audio_init(void);
96baaa6a 835
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836/* DV1394 */
837int dv1394_init(void);
f02be79d 838int dc1394_init(void);
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839
840#ifdef HAVE_AV_CONFIG_H
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841
842#include "os_support.h"
843
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844int strstart(const char *str, const char *val, const char **ptr);
845int stristart(const char *str, const char *val, const char **ptr);
846void pstrcpy(char *buf, int buf_size, const char *str);
847char *pstrcat(char *buf, int buf_size, const char *s);
fb025625 848
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849void __dynarray_add(unsigned long **tab_ptr, int *nb_ptr, unsigned long elem);
850
e4e70d2e 851#ifdef __GNUC__
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852#define dynarray_add(tab, nb_ptr, elem)\
853do {\
854 typeof(tab) _tab = (tab);\
855 typeof(elem) _elem = (elem);\
856 (void)sizeof(**_tab == _elem); /* check that types are compatible */\
857 __dynarray_add((unsigned long **)_tab, nb_ptr, (unsigned long)_elem);\
858} while(0)
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859#else
860#define dynarray_add(tab, nb_ptr, elem)\
861do {\
862 __dynarray_add((unsigned long **)(tab), nb_ptr, (unsigned long)(elem));\
863} while(0)
864#endif
39f472c3 865
f71869a4 866time_t mktimegm(struct tm *tm);
0c9fc6e1 867struct tm *brktimegm(time_t secs, struct tm *tm);
115329f1 868const char *small_strptime(const char *p, const char *fmt,
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869 struct tm *dt);
870
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871struct in_addr;
872int resolve_host(struct in_addr *sin_addr, const char *hostname);
873
874void url_split(char *proto, int proto_size,
6ba5cbc6 875 char *authorization, int authorization_size,
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876 char *hostname, int hostname_size,
877 int *port_ptr,
878 char *path, int path_size,
879 const char *url);
880
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881int match_ext(const char *filename, const char *extensions);
882
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883#endif /* HAVE_AV_CONFIG_H */
884
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885#ifdef __cplusplus
886}
887#endif
888
fb025625 889#endif /* AVFORMAT_H */
f3356e9c 890