added option probesize; at the moment only used by mpegts.c
[libav.git] / libavformat / avformat.h
1 #ifndef AVFORMAT_H
2 #define AVFORMAT_H
3
4 #ifdef __cplusplus
5 extern "C" {
6 #endif
7
8 #define LIBAVFORMAT_VERSION_INT ((50<<16)+(5<<8)+0)
9 #define LIBAVFORMAT_VERSION 50.5.0
10 #define LIBAVFORMAT_BUILD LIBAVFORMAT_VERSION_INT
11
12 #define LIBAVFORMAT_IDENT "Lavf" AV_STRINGIFY(LIBAVFORMAT_VERSION)
13
14 #include <time.h>
15 #include <stdio.h> /* FILE */
16 #include "avcodec.h"
17
18 #include "avio.h"
19
20 /* packet functions */
21
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
30 typedef struct AVPacket {
31 int64_t pts; ///< presentation time stamp in time_base units
32 int64_t dts; ///< decompression time stamp in time_base units
33 uint8_t *data;
34 int size;
35 int stream_index;
36 int flags;
37 int duration; ///< presentation duration in time_base units (0 if not available)
38 void (*destruct)(struct AVPacket *);
39 void *priv;
40 int64_t pos; ///< byte position in stream, -1 if unknown
41 } AVPacket;
42 #define PKT_FLAG_KEY 0x0001
43
44 void av_destruct_packet_nofree(AVPacket *pkt);
45 void av_destruct_packet(AVPacket *pkt);
46
47 /* initialize optional fields of a packet */
48 static inline void av_init_packet(AVPacket *pkt)
49 {
50 pkt->pts = AV_NOPTS_VALUE;
51 pkt->dts = AV_NOPTS_VALUE;
52 pkt->pos = -1;
53 pkt->duration = 0;
54 pkt->flags = 0;
55 pkt->stream_index = 0;
56 pkt->destruct= av_destruct_packet_nofree;
57 }
58
59 int av_new_packet(AVPacket *pkt, int size);
60 int av_get_packet(ByteIOContext *s, AVPacket *pkt, int size);
61 int av_dup_packet(AVPacket *pkt);
62
63 /**
64 * Free a packet
65 *
66 * @param pkt packet to free
67 */
68 static inline void av_free_packet(AVPacket *pkt)
69 {
70 if (pkt && pkt->destruct) {
71 pkt->destruct(pkt);
72 }
73 }
74
75 /*************************************************/
76 /* fractional numbers for exact pts handling */
77
78 /* the exact value of the fractional number is: 'val + num / den'. num
79 is assumed to be such as 0 <= num < den */
80 typedef struct AVFrac {
81 int64_t val, num, den;
82 } AVFrac attribute_deprecated;
83
84 /*************************************************/
85 /* input/output formats */
86
87 struct AVFormatContext;
88
89 /* this structure contains the data a format has to probe a file */
90 typedef struct AVProbeData {
91 const char *filename;
92 unsigned char *buf;
93 int buf_size;
94 } AVProbeData;
95
96 #define AVPROBE_SCORE_MAX 100
97
98 typedef struct AVFormatParameters {
99 AVRational time_base;
100 int sample_rate;
101 int channels;
102 int width;
103 int height;
104 enum PixelFormat pix_fmt;
105 struct AVImageFormat *image_format;
106 int channel; /* used to select dv channel */
107 const char *device; /* video, audio or DV device */
108 const char *standard; /* tv standard, NTSC, PAL, SECAM */
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 */
113 int initial_pause:1; /* do not begin to play the stream
114 immediately (RTSP only) */
115 int prealloced_context:1;
116 enum CodecID video_codec_id;
117 enum CodecID audio_codec_id;
118 } AVFormatParameters;
119
120 #define AVFMT_NOFILE 0x0001 /* no file should be opened */
121 #define AVFMT_NEEDNUMBER 0x0002 /* needs '%d' in filename */
122 #define AVFMT_SHOW_IDS 0x0008 /* show format stream IDs numbers */
123 #define AVFMT_RAWPICTURE 0x0020 /* format wants AVPicture structure for
124 raw picture data */
125 #define AVFMT_GLOBALHEADER 0x0040 /* format wants global header */
126 #define AVFMT_NOTIMESTAMPS 0x0080 /* format doesnt need / has any timestamps */
127
128 typedef struct AVOutputFormat {
129 const char *name;
130 const char *long_name;
131 const char *mime_type;
132 const char *extensions; /* comma separated extensions */
133 /* size of private data so that it can be allocated in the wrapper */
134 int priv_data_size;
135 /* output support */
136 enum CodecID audio_codec; /* default audio codec */
137 enum CodecID video_codec; /* default video codec */
138 int (*write_header)(struct AVFormatContext *);
139 int (*write_packet)(struct AVFormatContext *, AVPacket *pkt);
140 int (*write_trailer)(struct AVFormatContext *);
141 /* can use flags: AVFMT_NOFILE, AVFMT_NEEDNUMBER, AVFMT_GLOBALHEADER */
142 int flags;
143 /* currently only used to set pixel format if not YUV420P */
144 int (*set_parameters)(struct AVFormatContext *, AVFormatParameters *);
145 int (*interleave_packet)(struct AVFormatContext *, AVPacket *out, AVPacket *in, int flush);
146 /* private fields */
147 struct AVOutputFormat *next;
148 } AVOutputFormat;
149
150 typedef struct AVInputFormat {
151 const char *name;
152 const char *long_name;
153 /* size of private data so that it can be allocated in the wrapper */
154 int priv_data_size;
155 /* tell if a given file has a chance of being parsing by this format */
156 int (*read_probe)(AVProbeData *);
157 /* read the format header and initialize the AVFormatContext
158 structure. Return 0 if OK. 'ap' if non NULL contains
159 additionnal paramters. Only used in raw format right
160 now. 'av_new_stream' should be called to create new streams. */
161 int (*read_header)(struct AVFormatContext *,
162 AVFormatParameters *ap);
163 /* read one packet and put it in 'pkt'. pts and flags are also
164 set. 'av_new_stream' can be called only if the flag
165 AVFMTCTX_NOHEADER is used. */
166 int (*read_packet)(struct AVFormatContext *, AVPacket *pkt);
167 /* close the stream. The AVFormatContext and AVStreams are not
168 freed by this function */
169 int (*read_close)(struct AVFormatContext *);
170 /**
171 * seek to a given timestamp relative to the frames in
172 * stream component stream_index
173 * @param stream_index must not be -1
174 * @param flags selects which direction should be preferred if no exact
175 * match is available
176 */
177 int (*read_seek)(struct AVFormatContext *,
178 int stream_index, int64_t timestamp, int flags);
179 /**
180 * gets the next timestamp in AV_TIME_BASE units.
181 */
182 int64_t (*read_timestamp)(struct AVFormatContext *s, int stream_index,
183 int64_t *pos, int64_t pos_limit);
184 /* can use flags: AVFMT_NOFILE, AVFMT_NEEDNUMBER */
185 int flags;
186 /* if extensions are defined, then no probe is done. You should
187 usually not use extension format guessing because it is not
188 reliable enough */
189 const char *extensions;
190 /* general purpose read only value that the format can use */
191 int value;
192
193 /* start/resume playing - only meaningful if using a network based format
194 (RTSP) */
195 int (*read_play)(struct AVFormatContext *);
196
197 /* pause playing - only meaningful if using a network based format
198 (RTSP) */
199 int (*read_pause)(struct AVFormatContext *);
200
201 /* private fields */
202 struct AVInputFormat *next;
203 } AVInputFormat;
204
205 typedef struct AVIndexEntry {
206 int64_t pos;
207 int64_t timestamp;
208 #define AVINDEX_KEYFRAME 0x0001
209 int flags:2;
210 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)
211 int min_distance; /* min distance between this and the previous keyframe, used to avoid unneeded searching */
212 } AVIndexEntry;
213
214 typedef struct AVStream {
215 int index; /* stream index in AVFormatContext */
216 int id; /* format specific stream id */
217 AVCodecContext *codec; /* codec context */
218 /**
219 * real base frame rate of the stream.
220 * for example if the timebase is 1/90000 and all frames have either
221 * approximately 3600 or 1800 timer ticks then r_frame_rate will be 50/1
222 */
223 AVRational r_frame_rate;
224 void *priv_data;
225 /* internal data used in av_find_stream_info() */
226 int64_t codec_info_duration;
227 int codec_info_nb_frames;
228 /* encoding: PTS generation when outputing stream */
229 AVFrac pts;
230
231 /**
232 * this is the fundamental unit of time (in seconds) in terms
233 * of which frame timestamps are represented. for fixed-fps content,
234 * timebase should be 1/framerate and timestamp increments should be
235 * identically 1.
236 */
237 AVRational time_base;
238 int pts_wrap_bits; /* number of bits in pts (used for wrapping control) */
239 /* ffmpeg.c private use */
240 int stream_copy; /* if TRUE, just copy stream */
241 enum AVDiscard discard; ///< selects which packets can be discarded at will and dont need to be demuxed
242 //FIXME move stuff to a flags field?
243 /* quality, as it has been removed from AVCodecContext and put in AVVideoFrame
244 * MN:dunno if thats the right place, for it */
245 float quality;
246 /* decoding: position of the first frame of the component, in
247 AV_TIME_BASE fractional seconds. */
248 int64_t start_time;
249 /* decoding: duration of the stream, in AV_TIME_BASE fractional
250 seconds. */
251 int64_t duration;
252
253 char language[4]; /* ISO 639 3-letter language code (empty string if undefined) */
254
255 /* av_read_frame() support */
256 int need_parsing; ///< 1->full parsing needed, 2->only parse headers dont repack
257 struct AVCodecParserContext *parser;
258
259 int64_t cur_dts;
260 int last_IP_duration;
261 int64_t last_IP_pts;
262 /* av_seek_frame() support */
263 AVIndexEntry *index_entries; /* only used if the format does not
264 support seeking natively */
265 int nb_index_entries;
266 int index_entries_allocated_size;
267
268 int64_t nb_frames; ///< number of frames in this stream if known or 0
269 } AVStream;
270
271 #define AVFMTCTX_NOHEADER 0x0001 /* signal that no header is present
272 (streams are added dynamically) */
273
274 #define MAX_STREAMS 20
275
276 /* format I/O context */
277 typedef struct AVFormatContext {
278 const AVClass *av_class; /* set by av_alloc_format_context */
279 /* can only be iformat or oformat, not both at the same time */
280 struct AVInputFormat *iformat;
281 struct AVOutputFormat *oformat;
282 void *priv_data;
283 ByteIOContext pb;
284 int nb_streams;
285 AVStream *streams[MAX_STREAMS];
286 char filename[1024]; /* input or output filename */
287 /* stream info */
288 int64_t timestamp;
289 char title[512];
290 char author[512];
291 char copyright[512];
292 char comment[512];
293 char album[512];
294 int year; /* ID3 year, 0 if none */
295 int track; /* track number, 0 if none */
296 char genre[32]; /* ID3 genre */
297
298 int ctx_flags; /* format specific flags, see AVFMTCTX_xx */
299 /* private data for pts handling (do not modify directly) */
300 /* This buffer is only needed when packets were already buffered but
301 not decoded, for example to get the codec parameters in mpeg
302 streams */
303 struct AVPacketList *packet_buffer;
304
305 /* decoding: position of the first frame of the component, in
306 AV_TIME_BASE fractional seconds. NEVER set this value directly:
307 it is deduced from the AVStream values. */
308 int64_t start_time;
309 /* decoding: duration of the stream, in AV_TIME_BASE fractional
310 seconds. NEVER set this value directly: it is deduced from the
311 AVStream values. */
312 int64_t duration;
313 /* decoding: total file size. 0 if unknown */
314 int64_t file_size;
315 /* decoding: total stream bitrate in bit/s, 0 if not
316 available. Never set it directly if the file_size and the
317 duration are known as ffmpeg can compute it automatically. */
318 int bit_rate;
319
320 /* av_read_frame() support */
321 AVStream *cur_st;
322 const uint8_t *cur_ptr;
323 int cur_len;
324 AVPacket cur_pkt;
325
326 /* av_seek_frame() support */
327 int64_t data_offset; /* offset of the first packet */
328 int index_built;
329
330 int mux_rate;
331 int packet_size;
332 int preload;
333 int max_delay;
334
335 #define AVFMT_NOOUTPUTLOOP -1
336 #define AVFMT_INFINITEOUTPUTLOOP 0
337 /* number of times to loop output in formats that support it */
338 int loop_output;
339
340 int flags;
341 #define AVFMT_FLAG_GENPTS 0x0001 ///< generate pts if missing even if it requires parsing future frames
342
343 int loop_input;
344 /* decoding: size of data to probe; encoding unused */
345 unsigned int probesize;
346 } AVFormatContext;
347
348 typedef struct AVPacketList {
349 AVPacket pkt;
350 struct AVPacketList *next;
351 } AVPacketList;
352
353 extern AVInputFormat *first_iformat;
354 extern AVOutputFormat *first_oformat;
355
356 /* still image support */
357 struct AVInputImageContext attribute_deprecated;
358 typedef struct AVInputImageContext AVInputImageContext attribute_deprecated;
359
360 typedef struct AVImageInfo {
361 enum PixelFormat pix_fmt; /* requested pixel format */
362 int width; /* requested width */
363 int height; /* requested height */
364 int interleaved; /* image is interleaved (e.g. interleaved GIF) */
365 AVPicture pict; /* returned allocated image */
366 } AVImageInfo attribute_deprecated;
367
368 /* AVImageFormat.flags field constants */
369 #define AVIMAGE_INTERLEAVED 0x0001 /* image format support interleaved output */
370
371 typedef struct AVImageFormat {
372 const char *name;
373 const char *extensions;
374 /* tell if a given file has a chance of being parsing by this format */
375 int (*img_probe)(AVProbeData *);
376 /* read a whole image. 'alloc_cb' is called when the image size is
377 known so that the caller can allocate the image. If 'allo_cb'
378 returns non zero, then the parsing is aborted. Return '0' if
379 OK. */
380 int (*img_read)(ByteIOContext *,
381 int (*alloc_cb)(void *, AVImageInfo *info), void *);
382 /* write the image */
383 int supported_pixel_formats; /* mask of supported formats for output */
384 int (*img_write)(ByteIOContext *, AVImageInfo *);
385 int flags;
386 struct AVImageFormat *next;
387 } AVImageFormat attribute_deprecated;
388
389 void av_register_image_format(AVImageFormat *img_fmt) attribute_deprecated;
390 AVImageFormat *av_probe_image_format(AVProbeData *pd) attribute_deprecated;
391 AVImageFormat *guess_image_format(const char *filename) attribute_deprecated;
392 enum CodecID av_guess_image2_codec(const char *filename);
393 int av_read_image(ByteIOContext *pb, const char *filename,
394 AVImageFormat *fmt,
395 int (*alloc_cb)(void *, AVImageInfo *info), void *opaque) attribute_deprecated;
396 int av_write_image(ByteIOContext *pb, AVImageFormat *fmt, AVImageInfo *img) attribute_deprecated;
397
398 extern AVImageFormat *first_image_format attribute_deprecated;
399
400 /* XXX: use automatic init with either ELF sections or C file parser */
401 /* modules */
402
403 #include "rtp.h"
404
405 #include "rtsp.h"
406
407 /* yuv4mpeg.c */
408 extern AVOutputFormat yuv4mpegpipe_muxer;
409
410 /* utils.c */
411 void av_register_input_format(AVInputFormat *format);
412 void av_register_output_format(AVOutputFormat *format);
413 AVOutputFormat *guess_stream_format(const char *short_name,
414 const char *filename, const char *mime_type);
415 AVOutputFormat *guess_format(const char *short_name,
416 const char *filename, const char *mime_type);
417 enum CodecID av_guess_codec(AVOutputFormat *fmt, const char *short_name,
418 const char *filename, const char *mime_type, enum CodecType type);
419
420 void av_hex_dump(FILE *f, uint8_t *buf, int size);
421 void av_pkt_dump(FILE *f, AVPacket *pkt, int dump_payload);
422
423 void av_register_all(void);
424
425 typedef struct FifoBuffer {
426 uint8_t *buffer;
427 uint8_t *rptr, *wptr, *end;
428 } FifoBuffer;
429
430 int fifo_init(FifoBuffer *f, int size);
431 void fifo_free(FifoBuffer *f);
432 int fifo_size(FifoBuffer *f, uint8_t *rptr);
433 int fifo_read(FifoBuffer *f, uint8_t *buf, int buf_size, uint8_t **rptr_ptr);
434 void fifo_write(FifoBuffer *f, const uint8_t *buf, int size, uint8_t **wptr_ptr);
435 int put_fifo(ByteIOContext *pb, FifoBuffer *f, int buf_size, uint8_t **rptr_ptr);
436 void fifo_realloc(FifoBuffer *f, unsigned int size);
437
438 /* media file input */
439 AVInputFormat *av_find_input_format(const char *short_name);
440 AVInputFormat *av_probe_input_format(AVProbeData *pd, int is_opened);
441 int av_open_input_stream(AVFormatContext **ic_ptr,
442 ByteIOContext *pb, const char *filename,
443 AVInputFormat *fmt, AVFormatParameters *ap);
444 int av_open_input_file(AVFormatContext **ic_ptr, const char *filename,
445 AVInputFormat *fmt,
446 int buf_size,
447 AVFormatParameters *ap);
448 /* no av_open for output, so applications will need this: */
449 AVFormatContext *av_alloc_format_context(void);
450
451 #define AVERROR_UNKNOWN (-1) /* unknown error */
452 #define AVERROR_IO (-2) /* i/o error */
453 #define AVERROR_NUMEXPECTED (-3) /* number syntax expected in filename */
454 #define AVERROR_INVALIDDATA (-4) /* invalid data found */
455 #define AVERROR_NOMEM (-5) /* not enough memory */
456 #define AVERROR_NOFMT (-6) /* unknown format */
457 #define AVERROR_NOTSUPP (-7) /* operation not supported */
458
459 int av_find_stream_info(AVFormatContext *ic);
460 int av_read_packet(AVFormatContext *s, AVPacket *pkt);
461 int av_read_frame(AVFormatContext *s, AVPacket *pkt);
462 int av_seek_frame(AVFormatContext *s, int stream_index, int64_t timestamp, int flags);
463 int av_read_play(AVFormatContext *s);
464 int av_read_pause(AVFormatContext *s);
465 void av_close_input_file(AVFormatContext *s);
466 AVStream *av_new_stream(AVFormatContext *s, int id);
467 void av_set_pts_info(AVStream *s, int pts_wrap_bits,
468 int pts_num, int pts_den);
469
470 #define AVSEEK_FLAG_BACKWARD 1 ///< seek backward
471 #define AVSEEK_FLAG_BYTE 2 ///< seeking based on position in bytes
472 #define AVSEEK_FLAG_ANY 4 ///< seek to any frame, even non keyframes
473
474 int av_find_default_stream_index(AVFormatContext *s);
475 int av_index_search_timestamp(AVStream *st, int64_t timestamp, int flags);
476 int av_add_index_entry(AVStream *st,
477 int64_t pos, int64_t timestamp, int size, int distance, int flags);
478 int av_seek_frame_binary(AVFormatContext *s, int stream_index, int64_t target_ts, int flags);
479 void av_update_cur_dts(AVFormatContext *s, AVStream *ref_st, int64_t timestamp);
480
481 /* media file output */
482 int av_set_parameters(AVFormatContext *s, AVFormatParameters *ap);
483 int av_write_header(AVFormatContext *s);
484 int av_write_frame(AVFormatContext *s, AVPacket *pkt);
485 int av_interleaved_write_frame(AVFormatContext *s, AVPacket *pkt);
486 int av_interleave_packet_per_dts(AVFormatContext *s, AVPacket *out, AVPacket *pkt, int flush);
487
488 int av_write_trailer(AVFormatContext *s);
489
490 void dump_format(AVFormatContext *ic,
491 int index,
492 const char *url,
493 int is_output);
494 int parse_image_size(int *width_ptr, int *height_ptr, const char *str);
495 int parse_frame_rate(int *frame_rate, int *frame_rate_base, const char *arg);
496 int64_t parse_date(const char *datestr, int duration);
497
498 int64_t av_gettime(void);
499
500 /* ffm specific for ffserver */
501 #define FFM_PACKET_SIZE 4096
502 offset_t ffm_read_write_index(int fd);
503 void ffm_write_write_index(int fd, offset_t pos);
504 void ffm_set_write_index(AVFormatContext *s, offset_t pos, offset_t file_size);
505
506 int find_info_tag(char *arg, int arg_size, const char *tag1, const char *info);
507
508 int get_frame_filename(char *buf, int buf_size,
509 const char *path, int number);
510 int filename_number_test(const char *filename);
511
512 /* grab specific */
513 int video_grab_init(void);
514 int audio_init(void);
515
516 /* DV1394 */
517 int dv1394_init(void);
518 int dc1394_init(void);
519
520 #ifdef HAVE_AV_CONFIG_H
521
522 #include "os_support.h"
523
524 int strstart(const char *str, const char *val, const char **ptr);
525 int stristart(const char *str, const char *val, const char **ptr);
526 void pstrcpy(char *buf, int buf_size, const char *str);
527 char *pstrcat(char *buf, int buf_size, const char *s);
528
529 void __dynarray_add(unsigned long **tab_ptr, int *nb_ptr, unsigned long elem);
530
531 #ifdef __GNUC__
532 #define dynarray_add(tab, nb_ptr, elem)\
533 do {\
534 typeof(tab) _tab = (tab);\
535 typeof(elem) _elem = (elem);\
536 (void)sizeof(**_tab == _elem); /* check that types are compatible */\
537 __dynarray_add((unsigned long **)_tab, nb_ptr, (unsigned long)_elem);\
538 } while(0)
539 #else
540 #define dynarray_add(tab, nb_ptr, elem)\
541 do {\
542 __dynarray_add((unsigned long **)(tab), nb_ptr, (unsigned long)(elem));\
543 } while(0)
544 #endif
545
546 time_t mktimegm(struct tm *tm);
547 struct tm *brktimegm(time_t secs, struct tm *tm);
548 const char *small_strptime(const char *p, const char *fmt,
549 struct tm *dt);
550
551 struct in_addr;
552 int resolve_host(struct in_addr *sin_addr, const char *hostname);
553
554 void url_split(char *proto, int proto_size,
555 char *authorization, int authorization_size,
556 char *hostname, int hostname_size,
557 int *port_ptr,
558 char *path, int path_size,
559 const char *url);
560
561 int match_ext(const char *filename, const char *extensions);
562
563 #endif /* HAVE_AV_CONFIG_H */
564
565 #ifdef __cplusplus
566 }
567 #endif
568
569 #endif /* AVFORMAT_H */
570