export low_delay for encoding too
[libav.git] / libavformat / avformat.h
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1#ifndef AVFORMAT_H
2#define AVFORMAT_H
de6d9b64 3
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4#ifdef __cplusplus
5extern "C" {
6#endif
7
e928649b 8#define LIBAVFORMAT_BUILD 4615
8026c3b5 9
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10#define LIBAVFORMAT_VERSION_INT FFMPEG_VERSION_INT
11#define LIBAVFORMAT_VERSION FFMPEG_VERSION
12#define LIBAVFORMAT_IDENT "FFmpeg" FFMPEG_VERSION "b" AV_STRINGIFY(LIBAVFORMAT_BUILD)
4b1f4f23 13
f71869a4 14#include <time.h>
67070e4f 15#include <stdio.h> /* FILE */
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16#include "avcodec.h"
17
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18#include "avio.h"
19
20/* packet functions */
21
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22#ifndef MAXINT64
23#define MAXINT64 int64_t_C(0x7fffffffffffffff)
24#endif
25
26#ifndef MININT64
27#define MININT64 int64_t_C(0x8000000000000000)
28#endif
29
de6d9b64 30typedef struct AVPacket {
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31 int64_t pts; /* presentation time stamp in AV_TIME_BASE units (or
32 pts_den units in muxers or demuxers) */
33 int64_t dts; /* decompression time stamp in AV_TIME_BASE units (or
34 pts_den units in muxers or demuxers) */
0c1a9eda 35 uint8_t *data;
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36 int size;
37 int stream_index;
38 int flags;
fb2758c8 39 int duration; /* presentation duration (0 if not available) */
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40 void (*destruct)(struct AVPacket *);
41 void *priv;
de6d9b64 42} AVPacket;
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43#define PKT_FLAG_KEY 0x0001
44
da24c5e3 45/* initialize optional fields of a packet */
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46static inline void av_init_packet(AVPacket *pkt)
47{
48 pkt->pts = AV_NOPTS_VALUE;
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49 pkt->dts = AV_NOPTS_VALUE;
50 pkt->duration = 0;
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51 pkt->flags = 0;
52 pkt->stream_index = 0;
53}
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54
55int av_new_packet(AVPacket *pkt, int size);
fb2758c8 56int av_dup_packet(AVPacket *pkt);
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57
58/**
59 * Free a packet
60 *
61 * @param pkt packet to free
62 */
63static inline void av_free_packet(AVPacket *pkt)
64{
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65 if (pkt && pkt->destruct) {
66 pkt->destruct(pkt);
67 }
6fa5a56c 68}
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69
70/*************************************************/
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71/* fractional numbers for exact pts handling */
72
73/* the exact value of the fractional number is: 'val + num / den'. num
74 is assumed to be such as 0 <= num < den */
75typedef struct AVFrac {
0c1a9eda 76 int64_t val, num, den;
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77} AVFrac;
78
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79void av_frac_init(AVFrac *f, int64_t val, int64_t num, int64_t den);
80void av_frac_add(AVFrac *f, int64_t incr);
81void av_frac_set(AVFrac *f, int64_t val);
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82
83/*************************************************/
b9a281db 84/* input/output formats */
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85
86struct AVFormatContext;
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87
88/* this structure contains the data a format has to probe a file */
89typedef struct AVProbeData {
5c91a675 90 const char *filename;
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91 unsigned char *buf;
92 int buf_size;
93} AVProbeData;
94
95#define AVPROBE_SCORE_MAX 100
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96
97typedef struct AVFormatParameters {
98 int frame_rate;
14bea432 99 int frame_rate_base;
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100 int sample_rate;
101 int channels;
102 int width;
103 int height;
4606ac8d 104 enum PixelFormat pix_fmt;
290c5fa6 105 struct AVImageFormat *image_format;
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106 int channel; /* used to select dv channel */
107 const char *device; /* video4linux, audio or DV device */
e3ee3283 108 const char *standard; /* tv standard, NTSC, PAL, SECAM */
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109 int mpeg2ts_raw:1; /* force raw MPEG2 transport stream output, if possible */
110 int mpeg2ts_compute_pcr:1; /* compute exact PCR for each transport
111 stream packet (only meaningful if
112 mpeg2ts_raw is TRUE */
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113 int initial_pause:1; /* do not begin to play the stream
114 immediately (RTSP only) */
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115} AVFormatParameters;
116
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117#define AVFMT_NOFILE 0x0001 /* no file should be opened */
118#define AVFMT_NEEDNUMBER 0x0002 /* needs '%d' in filename */
b9a281db 119#define AVFMT_SHOW_IDS 0x0008 /* show format stream IDs numbers */
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120#define AVFMT_RAWPICTURE 0x0020 /* format wants AVPicture structure for
121 raw picture data */
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122
123typedef struct AVOutputFormat {
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124 const char *name;
125 const char *long_name;
126 const char *mime_type;
127 const char *extensions; /* comma separated extensions */
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128 /* size of private data so that it can be allocated in the wrapper */
129 int priv_data_size;
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130 /* output support */
131 enum CodecID audio_codec; /* default audio codec */
132 enum CodecID video_codec; /* default video codec */
133 int (*write_header)(struct AVFormatContext *);
e928649b 134 int (*write_packet)(struct AVFormatContext *, AVPacket *pkt);
de6d9b64 135 int (*write_trailer)(struct AVFormatContext *);
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136 /* can use flags: AVFMT_NOFILE, AVFMT_NEEDNUMBER */
137 int flags;
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138 /* currently only used to set pixel format if not YUV420P */
139 int (*set_parameters)(struct AVFormatContext *, AVFormatParameters *);
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140 /* private fields */
141 struct AVOutputFormat *next;
142} AVOutputFormat;
de6d9b64 143
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144typedef struct AVInputFormat {
145 const char *name;
146 const char *long_name;
147 /* size of private data so that it can be allocated in the wrapper */
148 int priv_data_size;
149 /* tell if a given file has a chance of being parsing by this format */
150 int (*read_probe)(AVProbeData *);
151 /* read the format header and initialize the AVFormatContext
de6d9b64 152 structure. Return 0 if OK. 'ap' if non NULL contains
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153 additionnal paramters. Only used in raw format right
154 now. 'av_new_stream' should be called to create new streams. */
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155 int (*read_header)(struct AVFormatContext *,
156 AVFormatParameters *ap);
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157 /* read one packet and put it in 'pkt'. pts and flags are also
158 set. 'av_new_stream' can be called only if the flag
da24c5e3 159 AVFMTCTX_NOHEADER is used. */
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160 int (*read_packet)(struct AVFormatContext *, AVPacket *pkt);
161 /* close the stream. The AVFormatContext and AVStreams are not
162 freed by this function */
163 int (*read_close)(struct AVFormatContext *);
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164 /* seek at or before a given timestamp (given in AV_TIME_BASE
165 units) relative to the frames in stream component stream_index */
166 int (*read_seek)(struct AVFormatContext *,
167 int stream_index, int64_t timestamp);
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168 /**
169 * gets the next timestamp in AV_TIME_BASE units.
170 */
171 int64_t (*read_timestamp)(struct AVFormatContext *s, int stream_index,
172 int64_t *pos, int64_t pos_limit);
da24c5e3 173 /* can use flags: AVFMT_NOFILE, AVFMT_NEEDNUMBER */
de6d9b64 174 int flags;
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175 /* if extensions are defined, then no probe is done. You should
176 usually not use extension format guessing because it is not
177 reliable enough */
178 const char *extensions;
179 /* general purpose read only value that the format can use */
180 int value;
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181
182 /* start/resume playing - only meaningful if using a network based format
183 (RTSP) */
184 int (*read_play)(struct AVFormatContext *);
185
186 /* pause playing - only meaningful if using a network based format
187 (RTSP) */
188 int (*read_pause)(struct AVFormatContext *);
189
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190 /* private fields */
191 struct AVInputFormat *next;
192} AVInputFormat;
de6d9b64 193
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194typedef struct AVIndexEntry {
195 int64_t pos;
196 int64_t timestamp;
197#define AVINDEX_KEYFRAME 0x0001
b754978a 198/* the following 2 flags indicate that the next/prev keyframe is known, and scaning for it isnt needed */
fb2758c8 199 int flags;
3e9245a9 200 int min_distance; /* min distance between this and the previous keyframe, used to avoid unneeded searching */
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201} AVIndexEntry;
202
de6d9b64 203typedef struct AVStream {
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204 int index; /* stream index in AVFormatContext */
205 int id; /* format specific stream id */
de6d9b64 206 AVCodecContext codec; /* codec context */
76c0441b 207 int r_frame_rate; /* real frame rate of the stream */
14bea432 208 int r_frame_rate_base;/* real frame rate base of the stream */
de6d9b64 209 void *priv_data;
b9a281db 210 /* internal data used in av_find_stream_info() */
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211 int64_t codec_info_duration;
212 int codec_info_nb_frames;
da24c5e3 213 /* encoding: PTS generation when outputing stream */
1e51d801 214 AVFrac pts;
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215 AVRational time_base;
216 int pts_wrap_bits; /* number of bits in pts (used for wrapping control) */
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217 /* ffmpeg.c private use */
218 int stream_copy; /* if TRUE, just copy stream */
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219 /* quality, as it has been removed from AVCodecContext and put in AVVideoFrame
220 * MN:dunno if thats the right place, for it */
221 float quality;
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222 /* decoding: position of the first frame of the component, in
223 AV_TIME_BASE fractional seconds. */
224 int64_t start_time;
225 /* decoding: duration of the stream, in AV_TIME_BASE fractional
226 seconds. */
227 int64_t duration;
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228
229 /* av_read_frame() support */
230 int need_parsing;
231 struct AVCodecParserContext *parser;
6ec87caa 232
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233 int64_t cur_dts;
234 int last_IP_duration;
77405fc8 235 int64_t last_IP_pts;
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236 /* av_seek_frame() support */
237 AVIndexEntry *index_entries; /* only used if the format does not
238 support seeking natively */
239 int nb_index_entries;
240 int index_entries_allocated_size;
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241} AVStream;
242
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243#define AVFMTCTX_NOHEADER 0x0001 /* signal that no header is present
244 (streams are added dynamically) */
245
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246#define MAX_STREAMS 20
247
248/* format I/O context */
249typedef struct AVFormatContext {
43465395 250 AVClass *av_class; /* set by av_alloc_format_context */
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251 /* can only be iformat or oformat, not both at the same time */
252 struct AVInputFormat *iformat;
253 struct AVOutputFormat *oformat;
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254 void *priv_data;
255 ByteIOContext pb;
256 int nb_streams;
257 AVStream *streams[MAX_STREAMS];
258 char filename[1024]; /* input or output filename */
259 /* stream info */
4568325a 260 int64_t timestamp;
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261 char title[512];
262 char author[512];
263 char copyright[512];
264 char comment[512];
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265 char album[512];
266 int year; /* ID3 year, 0 if none */
267 int track; /* track number, 0 if none */
268 char genre[32]; /* ID3 genre */
269
da24c5e3 270 int ctx_flags; /* format specific flags, see AVFMTCTX_xx */
916c80e9 271 /* private data for pts handling (do not modify directly) */
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272 /* This buffer is only needed when packets were already buffered but
273 not decoded, for example to get the codec parameters in mpeg
274 streams */
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275 struct AVPacketList *packet_buffer;
276
277 /* decoding: position of the first frame of the component, in
278 AV_TIME_BASE fractional seconds. NEVER set this value directly:
279 it is deduced from the AVStream values. */
280 int64_t start_time;
281 /* decoding: duration of the stream, in AV_TIME_BASE fractional
282 seconds. NEVER set this value directly: it is deduced from the
283 AVStream values. */
284 int64_t duration;
285 /* decoding: total file size. 0 if unknown */
286 int64_t file_size;
287 /* decoding: total stream bitrate in bit/s, 0 if not
288 available. Never set it directly if the file_size and the
289 duration are known as ffmpeg can compute it automatically. */
290 int bit_rate;
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291
292 /* av_read_frame() support */
293 AVStream *cur_st;
294 const uint8_t *cur_ptr;
295 int cur_len;
296 AVPacket cur_pkt;
297
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298 /* av_seek_frame() support */
299 int64_t data_offset; /* offset of the first packet */
300 int index_built;
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301} AVFormatContext;
302
303typedef struct AVPacketList {
304 AVPacket pkt;
305 struct AVPacketList *next;
306} AVPacketList;
307
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308extern AVInputFormat *first_iformat;
309extern AVOutputFormat *first_oformat;
de6d9b64 310
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311/* still image support */
312struct AVInputImageContext;
313typedef struct AVInputImageContext AVInputImageContext;
314
315typedef struct AVImageInfo {
316 enum PixelFormat pix_fmt; /* requested pixel format */
317 int width; /* requested width */
318 int height; /* requested height */
7e2e1abf 319 int interleaved; /* image is interleaved (e.g. interleaved GIF) */
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320 AVPicture pict; /* returned allocated image */
321} AVImageInfo;
322
3b1a27e0 323/* AVImageFormat.flags field constants */
7e2e1abf 324#define AVIMAGE_INTERLEAVED 0x0001 /* image format support interleaved output */
3b1a27e0 325
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326typedef struct AVImageFormat {
327 const char *name;
328 const char *extensions;
329 /* tell if a given file has a chance of being parsing by this format */
330 int (*img_probe)(AVProbeData *);
331 /* read a whole image. 'alloc_cb' is called when the image size is
332 known so that the caller can allocate the image. If 'allo_cb'
333 returns non zero, then the parsing is aborted. Return '0' if
334 OK. */
335 int (*img_read)(ByteIOContext *,
336 int (*alloc_cb)(void *, AVImageInfo *info), void *);
337 /* write the image */
338 int supported_pixel_formats; /* mask of supported formats for output */
339 int (*img_write)(ByteIOContext *, AVImageInfo *);
3b1a27e0 340 int flags;
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341 struct AVImageFormat *next;
342} AVImageFormat;
343
344void av_register_image_format(AVImageFormat *img_fmt);
345AVImageFormat *av_probe_image_format(AVProbeData *pd);
346AVImageFormat *guess_image_format(const char *filename);
347int av_read_image(ByteIOContext *pb, const char *filename,
348 AVImageFormat *fmt,
349 int (*alloc_cb)(void *, AVImageInfo *info), void *opaque);
350int av_write_image(ByteIOContext *pb, AVImageFormat *fmt, AVImageInfo *img);
351
352extern AVImageFormat *first_image_format;
353
354extern AVImageFormat pnm_image_format;
355extern AVImageFormat pbm_image_format;
356extern AVImageFormat pgm_image_format;
357extern AVImageFormat ppm_image_format;
8975ba81 358extern AVImageFormat pam_image_format;
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359extern AVImageFormat pgmyuv_image_format;
360extern AVImageFormat yuv_image_format;
3a13f6bd 361#ifdef CONFIG_ZLIB
0e04e4e9 362extern AVImageFormat png_image_format;
3a13f6bd 363#endif
0250738f 364extern AVImageFormat jpeg_image_format;
cdc90af0 365extern AVImageFormat gif_image_format;
6a91ec51 366extern AVImageFormat sgi_image_format;
290c5fa6 367
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368/* XXX: use automatic init with either ELF sections or C file parser */
369/* modules */
de6d9b64 370
b9a281db 371/* mpeg.c */
ee404803 372extern AVInputFormat mpegps_demux;
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373int mpegps_init(void);
374
375/* mpegts.c */
376extern AVInputFormat mpegts_demux;
377int mpegts_init(void);
de6d9b64 378
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379/* rm.c */
380int rm_init(void);
381
382/* crc.c */
383int crc_init(void);
384
385/* img.c */
386int img_init(void);
387
388/* asf.c */
389int asf_init(void);
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390
391/* avienc.c */
b9a281db 392int avienc_init(void);
de6d9b64 393
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394/* avidec.c */
395int avidec_init(void);
6cea494e 396
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397/* swf.c */
398int swf_init(void);
399
400/* mov.c */
401int mov_init(void);
de6d9b64 402
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403/* movenc.c */
404int movenc_init(void);
405
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406/* flvenc.c */
407int flvenc_init(void);
408
409/* flvdec.c */
410int flvdec_init(void);
411
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412/* jpeg.c */
413int jpeg_init(void);
de6d9b64 414
6cea494e 415/* gif.c */
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416int gif_init(void);
417
6cea494e 418/* au.c */
b9a281db 419int au_init(void);
6cea494e 420
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421/* amr.c */
422int amr_init(void);
423
de6d9b64 424/* wav.c */
c3775e54 425int ff_wav_init(void);
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426
427/* raw.c */
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428int pcm_read_seek(AVFormatContext *s,
429 int stream_index, int64_t timestamp);
b9a281db 430int raw_init(void);
de6d9b64 431
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432/* mp3.c */
433int mp3_init(void);
434
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435/* yuv4mpeg.c */
436int yuv4mpeg_init(void);
437
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438/* ogg.c */
439int ogg_init(void);
440
f20dca40 441/* dv.c */
c3775e54 442int ff_dv_init(void);
f20dca40 443
de6d9b64 444/* ffm.c */
b9a281db 445int ffm_init(void);
de6d9b64 446
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447/* rtsp.c */
448extern AVInputFormat redir_demux;
449int redir_open(AVFormatContext **ic_ptr, ByteIOContext *f);
450
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451/* 4xm.c */
452int fourxm_init(void);
453
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454/* psxstr.c */
455int str_init(void);
456
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457/* idroq.c */
458int roq_init(void);
459
460/* ipmovie.c */
461int ipmovie_init(void);
462
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463/* nut.c */
464int nut_init(void);
465
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466/* wc3movie.c */
467int wc3_init(void);
468
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469/* westwood.c */
470int westwood_init(void);
471
472/* segafilm.c */
473int film_init(void);
474
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475/* idcin.c */
476int idcin_init(void);
477
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478/* flic.c */
479int flic_init(void);
480
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481/* sierravmd.c */
482int vmd_init(void);
483
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484/* matroska.c */
485int matroska_init(void);
486
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487#include "rtp.h"
488
489#include "rtsp.h"
490
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491/* yuv4mpeg.c */
492extern AVOutputFormat yuv4mpegpipe_oformat;
493
b9a281db 494/* utils.c */
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495void av_register_input_format(AVInputFormat *format);
496void av_register_output_format(AVOutputFormat *format);
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497AVOutputFormat *guess_stream_format(const char *short_name,
498 const char *filename, const char *mime_type);
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499AVOutputFormat *guess_format(const char *short_name,
500 const char *filename, const char *mime_type);
de6d9b64 501
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502void av_hex_dump(FILE *f, uint8_t *buf, int size);
503void av_pkt_dump(FILE *f, AVPacket *pkt, int dump_payload);
de6d9b64 504
94988531 505void av_register_all(void);
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506
507typedef struct FifoBuffer {
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508 uint8_t *buffer;
509 uint8_t *rptr, *wptr, *end;
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510} FifoBuffer;
511
512int fifo_init(FifoBuffer *f, int size);
513void fifo_free(FifoBuffer *f);
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514int fifo_size(FifoBuffer *f, uint8_t *rptr);
515int fifo_read(FifoBuffer *f, uint8_t *buf, int buf_size, uint8_t **rptr_ptr);
516void fifo_write(FifoBuffer *f, uint8_t *buf, int size, uint8_t **wptr_ptr);
de6d9b64 517
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518/* media file input */
519AVInputFormat *av_find_input_format(const char *short_name);
94988531 520AVInputFormat *av_probe_input_format(AVProbeData *pd, int is_opened);
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521int av_open_input_stream(AVFormatContext **ic_ptr,
522 ByteIOContext *pb, const char *filename,
523 AVInputFormat *fmt, AVFormatParameters *ap);
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524int av_open_input_file(AVFormatContext **ic_ptr, const char *filename,
525 AVInputFormat *fmt,
526 int buf_size,
527 AVFormatParameters *ap);
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528/* no av_open for output, so applications will need this: */
529AVFormatContext *av_alloc_format_context(void);
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530
531#define AVERROR_UNKNOWN (-1) /* unknown error */
532#define AVERROR_IO (-2) /* i/o error */
533#define AVERROR_NUMEXPECTED (-3) /* number syntax expected in filename */
534#define AVERROR_INVALIDDATA (-4) /* invalid data found */
535#define AVERROR_NOMEM (-5) /* not enough memory */
536#define AVERROR_NOFMT (-6) /* unknown format */
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537#define AVERROR_NOTSUPP (-7) /* operation not supported */
538
b9a281db 539int av_find_stream_info(AVFormatContext *ic);
de6d9b64 540int av_read_packet(AVFormatContext *s, AVPacket *pkt);
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541int av_read_frame(AVFormatContext *s, AVPacket *pkt);
542int av_seek_frame(AVFormatContext *s, int stream_index, int64_t timestamp);
543int av_read_play(AVFormatContext *s);
544int av_read_pause(AVFormatContext *s);
de6d9b64 545void av_close_input_file(AVFormatContext *s);
b9a281db 546AVStream *av_new_stream(AVFormatContext *s, int id);
9ee91c2f 547void av_set_pts_info(AVStream *s, int pts_wrap_bits,
916c80e9 548 int pts_num, int pts_den);
de6d9b64 549
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550int av_find_default_stream_index(AVFormatContext *s);
551int av_index_search_timestamp(AVStream *st, int timestamp);
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552int av_add_index_entry(AVStream *st,
553 int64_t pos, int64_t timestamp, int distance, int flags);
8d14a25c 554int av_seek_frame_binary(AVFormatContext *s, int stream_index, int64_t target_ts);
b754978a 555
b9a281db 556/* media file output */
290c5fa6 557int av_set_parameters(AVFormatContext *s, AVFormatParameters *ap);
b9a281db 558int av_write_header(AVFormatContext *s);
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559int av_write_frame(AVFormatContext *s, AVPacket *pkt);
560
b9a281db 561int av_write_trailer(AVFormatContext *s);
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562
563void dump_format(AVFormatContext *ic,
564 int index,
565 const char *url,
566 int is_output);
567int parse_image_size(int *width_ptr, int *height_ptr, const char *str);
445f1b83 568int parse_frame_rate(int *frame_rate, int *frame_rate_base, const char *arg);
0c1a9eda 569int64_t parse_date(const char *datestr, int duration);
de6d9b64 570
0c1a9eda 571int64_t av_gettime(void);
94988531 572
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573/* ffm specific for ffserver */
574#define FFM_PACKET_SIZE 4096
575offset_t ffm_read_write_index(int fd);
576void ffm_write_write_index(int fd, offset_t pos);
577void ffm_set_write_index(AVFormatContext *s, offset_t pos, offset_t file_size);
578
579int find_info_tag(char *arg, int arg_size, const char *tag1, const char *info);
580
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581int get_frame_filename(char *buf, int buf_size,
582 const char *path, int number);
b9a281db 583int filename_number_test(const char *filename);
96baaa6a 584
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585/* grab specific */
586int video_grab_init(void);
587int audio_init(void);
96baaa6a 588
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589/* DV1394 */
590int dv1394_init(void);
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591
592#ifdef HAVE_AV_CONFIG_H
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593
594#include "os_support.h"
595
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596int strstart(const char *str, const char *val, const char **ptr);
597int stristart(const char *str, const char *val, const char **ptr);
598void pstrcpy(char *buf, int buf_size, const char *str);
599char *pstrcat(char *buf, int buf_size, const char *s);
fb025625 600
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601void __dynarray_add(unsigned long **tab_ptr, int *nb_ptr, unsigned long elem);
602
e4e70d2e 603#ifdef __GNUC__
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604#define dynarray_add(tab, nb_ptr, elem)\
605do {\
606 typeof(tab) _tab = (tab);\
607 typeof(elem) _elem = (elem);\
608 (void)sizeof(**_tab == _elem); /* check that types are compatible */\
609 __dynarray_add((unsigned long **)_tab, nb_ptr, (unsigned long)_elem);\
610} while(0)
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611#else
612#define dynarray_add(tab, nb_ptr, elem)\
613do {\
614 __dynarray_add((unsigned long **)(tab), nb_ptr, (unsigned long)(elem));\
615} while(0)
616#endif
39f472c3 617
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618time_t mktimegm(struct tm *tm);
619const char *small_strptime(const char *p, const char *fmt,
620 struct tm *dt);
621
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622struct in_addr;
623int resolve_host(struct in_addr *sin_addr, const char *hostname);
624
625void url_split(char *proto, int proto_size,
626 char *hostname, int hostname_size,
627 int *port_ptr,
628 char *path, int path_size,
629 const char *url);
630
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631int match_ext(const char *filename, const char *extensions);
632
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633#endif /* HAVE_AV_CONFIG_H */
634
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635#ifdef __cplusplus
636}
637#endif
638
fb025625 639#endif /* AVFORMAT_H */