fix indention (dunno why it was messed up ...)
[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)+(7<<8)+0)
29#define LIBAVFORMAT_VERSION 51.7.0
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);
90ad92b3 57void av_destruct_packet(AVPacket *pkt);
63dd1377 58
da24c5e3 59/* initialize optional fields of a packet */
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60static inline void av_init_packet(AVPacket *pkt)
61{
62 pkt->pts = AV_NOPTS_VALUE;
fb2758c8 63 pkt->dts = AV_NOPTS_VALUE;
2692067a 64 pkt->pos = -1;
fb2758c8 65 pkt->duration = 0;
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66 pkt->flags = 0;
67 pkt->stream_index = 0;
63dd1377 68 pkt->destruct= av_destruct_packet_nofree;
6fa5a56c 69}
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70
71int av_new_packet(AVPacket *pkt, int size);
2692067a 72int av_get_packet(ByteIOContext *s, AVPacket *pkt, int size);
fb2758c8 73int av_dup_packet(AVPacket *pkt);
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74
75/**
76 * Free a packet
77 *
78 * @param pkt packet to free
79 */
80static inline void av_free_packet(AVPacket *pkt)
81{
342474ab 82 if (pkt && pkt->destruct) {
bb270c08 83 pkt->destruct(pkt);
342474ab 84 }
6fa5a56c 85}
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86
87/*************************************************/
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88/* fractional numbers for exact pts handling */
89
90/* the exact value of the fractional number is: 'val + num / den'. num
91 is assumed to be such as 0 <= num < den */
92typedef struct AVFrac {
115329f1 93 int64_t val, num, den;
955ab9a4 94} AVFrac attribute_deprecated;
916c80e9 95
916c80e9 96/*************************************************/
b9a281db 97/* input/output formats */
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98
99struct AVFormatContext;
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100
101/* this structure contains the data a format has to probe a file */
102typedef struct AVProbeData {
5c91a675 103 const char *filename;
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104 unsigned char *buf;
105 int buf_size;
106} AVProbeData;
107
0288a747 108#define AVPROBE_SCORE_MAX 100 ///< max score, half of that is used for file extension based detection
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109
110typedef struct AVFormatParameters {
c0df9d75 111 AVRational time_base;
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112 int sample_rate;
113 int channels;
114 int width;
115 int height;
4606ac8d 116 enum PixelFormat pix_fmt;
7f172339 117 int channel; /* used to select dv channel */
6beefa40 118 const char *device; /* video, audio or DV device */
e3ee3283 119 const char *standard; /* tv standard, NTSC, PAL, SECAM */
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120 int mpeg2ts_raw:1; /* force raw MPEG2 transport stream output, if possible */
121 int mpeg2ts_compute_pcr:1; /* compute exact PCR for each transport
122 stream packet (only meaningful if
123 mpeg2ts_raw is TRUE */
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124 int initial_pause:1; /* do not begin to play the stream
125 immediately (RTSP only) */
4eb72c6b 126 int prealloced_context:1;
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127 enum CodecID video_codec_id;
128 enum CodecID audio_codec_id;
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129} AVFormatParameters;
130
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131//! demuxer will use url_fopen, no opened file should be provided by the caller
132#define AVFMT_NOFILE 0x0001
115329f1 133#define AVFMT_NEEDNUMBER 0x0002 /* needs '%d' in filename */
b9a281db 134#define AVFMT_SHOW_IDS 0x0008 /* show format stream IDs numbers */
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135#define AVFMT_RAWPICTURE 0x0020 /* format wants AVPicture structure for
136 raw picture data */
c64d476c 137#define AVFMT_GLOBALHEADER 0x0040 /* format wants global header */
494bbf58 138#define AVFMT_NOTIMESTAMPS 0x0080 /* format doesnt need / has any timestamps */
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139
140typedef struct AVOutputFormat {
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141 const char *name;
142 const char *long_name;
143 const char *mime_type;
144 const char *extensions; /* comma separated extensions */
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145 /* size of private data so that it can be allocated in the wrapper */
146 int priv_data_size;
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147 /* output support */
148 enum CodecID audio_codec; /* default audio codec */
149 enum CodecID video_codec; /* default video codec */
150 int (*write_header)(struct AVFormatContext *);
e928649b 151 int (*write_packet)(struct AVFormatContext *, AVPacket *pkt);
de6d9b64 152 int (*write_trailer)(struct AVFormatContext *);
c64d476c 153 /* can use flags: AVFMT_NOFILE, AVFMT_NEEDNUMBER, AVFMT_GLOBALHEADER */
b9a281db 154 int flags;
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155 /* currently only used to set pixel format if not YUV420P */
156 int (*set_parameters)(struct AVFormatContext *, AVFormatParameters *);
fe2d6fe2 157 int (*interleave_packet)(struct AVFormatContext *, AVPacket *out, AVPacket *in, int flush);
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158 /* private fields */
159 struct AVOutputFormat *next;
160} AVOutputFormat;
de6d9b64 161
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162typedef struct AVInputFormat {
163 const char *name;
164 const char *long_name;
165 /* size of private data so that it can be allocated in the wrapper */
166 int priv_data_size;
167 /* tell if a given file has a chance of being parsing by this format */
168 int (*read_probe)(AVProbeData *);
169 /* read the format header and initialize the AVFormatContext
de6d9b64 170 structure. Return 0 if OK. 'ap' if non NULL contains
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171 additionnal paramters. Only used in raw format right
172 now. 'av_new_stream' should be called to create new streams. */
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173 int (*read_header)(struct AVFormatContext *,
174 AVFormatParameters *ap);
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175 /* read one packet and put it in 'pkt'. pts and flags are also
176 set. 'av_new_stream' can be called only if the flag
da24c5e3 177 AVFMTCTX_NOHEADER is used. */
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178 int (*read_packet)(struct AVFormatContext *, AVPacket *pkt);
179 /* close the stream. The AVFormatContext and AVStreams are not
180 freed by this function */
181 int (*read_close)(struct AVFormatContext *);
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182 /**
183 * seek to a given timestamp relative to the frames in
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184 * stream component stream_index
185 * @param stream_index must not be -1
115329f1 186 * @param flags selects which direction should be preferred if no exact
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187 * match is available
188 */
115329f1 189 int (*read_seek)(struct AVFormatContext *,
3ba1438d 190 int stream_index, int64_t timestamp, int flags);
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191 /**
192 * gets the next timestamp in AV_TIME_BASE units.
193 */
194 int64_t (*read_timestamp)(struct AVFormatContext *s, int stream_index,
195 int64_t *pos, int64_t pos_limit);
da24c5e3 196 /* can use flags: AVFMT_NOFILE, AVFMT_NEEDNUMBER */
de6d9b64 197 int flags;
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198 /* if extensions are defined, then no probe is done. You should
199 usually not use extension format guessing because it is not
200 reliable enough */
201 const char *extensions;
202 /* general purpose read only value that the format can use */
203 int value;
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204
205 /* start/resume playing - only meaningful if using a network based format
206 (RTSP) */
207 int (*read_play)(struct AVFormatContext *);
208
209 /* pause playing - only meaningful if using a network based format
210 (RTSP) */
211 int (*read_pause)(struct AVFormatContext *);
212
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213 /* private fields */
214 struct AVInputFormat *next;
215} AVInputFormat;
de6d9b64 216
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217typedef struct AVIndexEntry {
218 int64_t pos;
219 int64_t timestamp;
220#define AVINDEX_KEYFRAME 0x0001
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221 int flags:2;
222 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)
3e9245a9 223 int min_distance; /* min distance between this and the previous keyframe, used to avoid unneeded searching */
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224} AVIndexEntry;
225
de6d9b64 226typedef struct AVStream {
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227 int index; /* stream index in AVFormatContext */
228 int id; /* format specific stream id */
01f4895c 229 AVCodecContext *codec; /* codec context */
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230 /**
231 * real base frame rate of the stream.
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232 * this is the lowest framerate with which all timestamps can be
233 * represented accurately (its the least common multiple of all
234 * framerates in the stream), Note, this value is just a guess!
115329f1 235 * for example if the timebase is 1/90000 and all frames have either
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236 * approximately 3600 or 1800 timer ticks then r_frame_rate will be 50/1
237 */
238 AVRational r_frame_rate;
de6d9b64 239 void *priv_data;
b9a281db 240 /* internal data used in av_find_stream_info() */
115329f1 241 int64_t codec_info_duration;
fb2758c8 242 int codec_info_nb_frames;
da24c5e3 243 /* encoding: PTS generation when outputing stream */
1e51d801 244 AVFrac pts;
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245
246 /**
247 * this is the fundamental unit of time (in seconds) in terms
248 * of which frame timestamps are represented. for fixed-fps content,
249 * timebase should be 1/framerate and timestamp increments should be
250 * identically 1.
251 */
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252 AVRational time_base;
253 int pts_wrap_bits; /* number of bits in pts (used for wrapping control) */
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254 /* ffmpeg.c private use */
255 int stream_copy; /* if TRUE, just copy stream */
f3356e9c 256 enum AVDiscard discard; ///< selects which packets can be discarded at will and dont need to be demuxed
b4aea108 257 //FIXME move stuff to a flags field?
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258 /* quality, as it has been removed from AVCodecContext and put in AVVideoFrame
259 * MN:dunno if thats the right place, for it */
115329f1 260 float quality;
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261 /* decoding: position of the first frame of the component, in
262 AV_TIME_BASE fractional seconds. */
115329f1 263 int64_t start_time;
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264 /* decoding: duration of the stream, in AV_TIME_BASE fractional
265 seconds. */
266 int64_t duration;
fb2758c8 267
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268 char language[4]; /* ISO 639 3-letter language code (empty string if undefined) */
269
fb2758c8 270 /* av_read_frame() support */
7cbaa7ba 271 int need_parsing; ///< 1->full parsing needed, 2->only parse headers dont repack
fb2758c8 272 struct AVCodecParserContext *parser;
6ec87caa 273
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274 int64_t cur_dts;
275 int last_IP_duration;
77405fc8 276 int64_t last_IP_pts;
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277 /* av_seek_frame() support */
278 AVIndexEntry *index_entries; /* only used if the format does not
279 support seeking natively */
280 int nb_index_entries;
191e8ca7 281 unsigned int index_entries_allocated_size;
115329f1 282
b4b87d48 283 int64_t nb_frames; ///< number of frames in this stream if known or 0
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284
285#define MAX_REORDER_DELAY 4
286 int64_t pts_buffer[MAX_REORDER_DELAY+1];
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287} AVStream;
288
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289#define AVFMTCTX_NOHEADER 0x0001 /* signal that no header is present
290 (streams are added dynamically) */
291
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292#define MAX_STREAMS 20
293
294/* format I/O context */
295typedef struct AVFormatContext {
7fea94ce 296 const AVClass *av_class; /* set by av_alloc_format_context */
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297 /* can only be iformat or oformat, not both at the same time */
298 struct AVInputFormat *iformat;
299 struct AVOutputFormat *oformat;
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300 void *priv_data;
301 ByteIOContext pb;
db69c2e5 302 unsigned int nb_streams;
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303 AVStream *streams[MAX_STREAMS];
304 char filename[1024]; /* input or output filename */
305 /* stream info */
4568325a 306 int64_t timestamp;
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307 char title[512];
308 char author[512];
309 char copyright[512];
310 char comment[512];
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311 char album[512];
312 int year; /* ID3 year, 0 if none */
313 int track; /* track number, 0 if none */
314 char genre[32]; /* ID3 genre */
315
da24c5e3 316 int ctx_flags; /* format specific flags, see AVFMTCTX_xx */
916c80e9 317 /* private data for pts handling (do not modify directly) */
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318 /* This buffer is only needed when packets were already buffered but
319 not decoded, for example to get the codec parameters in mpeg
320 streams */
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321 struct AVPacketList *packet_buffer;
322
323 /* decoding: position of the first frame of the component, in
324 AV_TIME_BASE fractional seconds. NEVER set this value directly:
325 it is deduced from the AVStream values. */
115329f1 326 int64_t start_time;
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327 /* decoding: duration of the stream, in AV_TIME_BASE fractional
328 seconds. NEVER set this value directly: it is deduced from the
329 AVStream values. */
330 int64_t duration;
331 /* decoding: total file size. 0 if unknown */
332 int64_t file_size;
333 /* decoding: total stream bitrate in bit/s, 0 if not
334 available. Never set it directly if the file_size and the
335 duration are known as ffmpeg can compute it automatically. */
336 int bit_rate;
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337
338 /* av_read_frame() support */
339 AVStream *cur_st;
340 const uint8_t *cur_ptr;
341 int cur_len;
342 AVPacket cur_pkt;
343
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344 /* av_seek_frame() support */
345 int64_t data_offset; /* offset of the first packet */
346 int index_built;
115329f1 347
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348 int mux_rate;
349 int packet_size;
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350 int preload;
351 int max_delay;
8108551a 352
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353#define AVFMT_NOOUTPUTLOOP -1
354#define AVFMT_INFINITEOUTPUTLOOP 0
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355 /* number of times to loop output in formats that support it */
356 int loop_output;
115329f1 357
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358 int flags;
359#define AVFMT_FLAG_GENPTS 0x0001 ///< generate pts if missing even if it requires parsing future frames
2c00106c 360#define AVFMT_FLAG_IGNIDX 0x0002 ///< ignore index
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361
362 int loop_input;
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363 /* decoding: size of data to probe; encoding unused */
364 unsigned int probesize;
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365} AVFormatContext;
366
367typedef struct AVPacketList {
368 AVPacket pkt;
369 struct AVPacketList *next;
370} AVPacketList;
371
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372extern AVInputFormat *first_iformat;
373extern AVOutputFormat *first_oformat;
de6d9b64 374
5b6d5596 375enum CodecID av_guess_image2_codec(const char *filename);
290c5fa6 376
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377/* XXX: use automatic init with either ELF sections or C file parser */
378/* modules */
de6d9b64 379
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380#include "rtp.h"
381
382#include "rtsp.h"
383
b9a281db 384/* utils.c */
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385void av_register_input_format(AVInputFormat *format);
386void av_register_output_format(AVOutputFormat *format);
115329f1 387AVOutputFormat *guess_stream_format(const char *short_name,
36ada60c 388 const char *filename, const char *mime_type);
115329f1 389AVOutputFormat *guess_format(const char *short_name,
b9a281db 390 const char *filename, const char *mime_type);
115329f1 391enum CodecID av_guess_codec(AVOutputFormat *fmt, const char *short_name,
5b6d5596 392 const char *filename, const char *mime_type, enum CodecType type);
de6d9b64 393
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394void av_hex_dump(FILE *f, uint8_t *buf, int size);
395void av_pkt_dump(FILE *f, AVPacket *pkt, int dump_payload);
de6d9b64 396
94988531 397void av_register_all(void);
de6d9b64 398
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399/* media file input */
400AVInputFormat *av_find_input_format(const char *short_name);
94988531 401AVInputFormat *av_probe_input_format(AVProbeData *pd, int is_opened);
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402int av_open_input_stream(AVFormatContext **ic_ptr,
403 ByteIOContext *pb, const char *filename,
da24c5e3 404 AVInputFormat *fmt, AVFormatParameters *ap);
115329f1 405int av_open_input_file(AVFormatContext **ic_ptr, const char *filename,
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406 AVInputFormat *fmt,
407 int buf_size,
408 AVFormatParameters *ap);
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409/* no av_open for output, so applications will need this: */
410AVFormatContext *av_alloc_format_context(void);
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411
412#define AVERROR_UNKNOWN (-1) /* unknown error */
413#define AVERROR_IO (-2) /* i/o error */
414#define AVERROR_NUMEXPECTED (-3) /* number syntax expected in filename */
415#define AVERROR_INVALIDDATA (-4) /* invalid data found */
416#define AVERROR_NOMEM (-5) /* not enough memory */
417#define AVERROR_NOFMT (-6) /* unknown format */
fb2758c8 418#define AVERROR_NOTSUPP (-7) /* operation not supported */
115329f1 419
b9a281db 420int av_find_stream_info(AVFormatContext *ic);
de6d9b64 421int av_read_packet(AVFormatContext *s, AVPacket *pkt);
fb2758c8 422int av_read_frame(AVFormatContext *s, AVPacket *pkt);
3ba1438d 423int av_seek_frame(AVFormatContext *s, int stream_index, int64_t timestamp, int flags);
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424int av_read_play(AVFormatContext *s);
425int av_read_pause(AVFormatContext *s);
de6d9b64 426void av_close_input_file(AVFormatContext *s);
b9a281db 427AVStream *av_new_stream(AVFormatContext *s, int id);
9ee91c2f 428void av_set_pts_info(AVStream *s, int pts_wrap_bits,
916c80e9 429 int pts_num, int pts_den);
de6d9b64 430
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431#define AVSEEK_FLAG_BACKWARD 1 ///< seek backward
432#define AVSEEK_FLAG_BYTE 2 ///< seeking based on position in bytes
27a5fe5f 433#define AVSEEK_FLAG_ANY 4 ///< seek to any frame, even non keyframes
3ba1438d 434
b754978a 435int av_find_default_stream_index(AVFormatContext *s);
dc56fc38 436int av_index_search_timestamp(AVStream *st, int64_t timestamp, int flags);
3e9245a9 437int av_add_index_entry(AVStream *st,
30a43f2d 438 int64_t pos, int64_t timestamp, int size, int distance, int flags);
3ba1438d 439int av_seek_frame_binary(AVFormatContext *s, int stream_index, int64_t target_ts, int flags);
22ffac70 440void av_update_cur_dts(AVFormatContext *s, AVStream *ref_st, int64_t timestamp);
89ddd2a9 441int64_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 442
b9a281db 443/* media file output */
290c5fa6 444int av_set_parameters(AVFormatContext *s, AVFormatParameters *ap);
b9a281db 445int av_write_header(AVFormatContext *s);
e928649b 446int av_write_frame(AVFormatContext *s, AVPacket *pkt);
3c895fc0 447int av_interleaved_write_frame(AVFormatContext *s, AVPacket *pkt);
f21c0b4c 448int av_interleave_packet_per_dts(AVFormatContext *s, AVPacket *out, AVPacket *pkt, int flush);
e928649b 449
b9a281db 450int av_write_trailer(AVFormatContext *s);
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451
452void dump_format(AVFormatContext *ic,
115329f1 453 int index,
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454 const char *url,
455 int is_output);
456int parse_image_size(int *width_ptr, int *height_ptr, const char *str);
445f1b83 457int parse_frame_rate(int *frame_rate, int *frame_rate_base, const char *arg);
0c1a9eda 458int64_t parse_date(const char *datestr, int duration);
de6d9b64 459
0c1a9eda 460int64_t av_gettime(void);
94988531 461
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462/* ffm specific for ffserver */
463#define FFM_PACKET_SIZE 4096
464offset_t ffm_read_write_index(int fd);
465void ffm_write_write_index(int fd, offset_t pos);
466void ffm_set_write_index(AVFormatContext *s, offset_t pos, offset_t file_size);
467
468int find_info_tag(char *arg, int arg_size, const char *tag1, const char *info);
469
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470int av_get_frame_filename(char *buf, int buf_size,
471 const char *path, int number);
472int av_filename_number_test(const char *filename);
96baaa6a 473
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474/* grab specific */
475int video_grab_init(void);
476int audio_init(void);
96baaa6a 477
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478/* DV1394 */
479int dv1394_init(void);
f02be79d 480int dc1394_init(void);
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481
482#ifdef HAVE_AV_CONFIG_H
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483
484#include "os_support.h"
485
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486int strstart(const char *str, const char *val, const char **ptr);
487int stristart(const char *str, const char *val, const char **ptr);
488void pstrcpy(char *buf, int buf_size, const char *str);
489char *pstrcat(char *buf, int buf_size, const char *s);
fb025625 490
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491void __dynarray_add(unsigned long **tab_ptr, int *nb_ptr, unsigned long elem);
492
e4e70d2e 493#ifdef __GNUC__
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494#define dynarray_add(tab, nb_ptr, elem)\
495do {\
496 typeof(tab) _tab = (tab);\
497 typeof(elem) _elem = (elem);\
498 (void)sizeof(**_tab == _elem); /* check that types are compatible */\
499 __dynarray_add((unsigned long **)_tab, nb_ptr, (unsigned long)_elem);\
500} while(0)
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501#else
502#define dynarray_add(tab, nb_ptr, elem)\
503do {\
504 __dynarray_add((unsigned long **)(tab), nb_ptr, (unsigned long)(elem));\
505} while(0)
506#endif
39f472c3 507
f71869a4 508time_t mktimegm(struct tm *tm);
0c9fc6e1 509struct tm *brktimegm(time_t secs, struct tm *tm);
115329f1 510const char *small_strptime(const char *p, const char *fmt,
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511 struct tm *dt);
512
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513struct in_addr;
514int resolve_host(struct in_addr *sin_addr, const char *hostname);
515
516void url_split(char *proto, int proto_size,
6ba5cbc6 517 char *authorization, int authorization_size,
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518 char *hostname, int hostname_size,
519 int *port_ptr,
520 char *path, int path_size,
521 const char *url);
522
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523int match_ext(const char *filename, const char *extensions);
524
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525#endif /* HAVE_AV_CONFIG_H */
526
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527#ifdef __cplusplus
528}
529#endif
530
fb025625 531#endif /* AVFORMAT_H */
f3356e9c 532