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