2c8f8e9c3af22428a465a266a3cce315b1735820
[libav.git] / libavformat / avformat.h
1 /*
2 * copyright (c) 2001 Fabrice Bellard
3 *
4 * This file is part of FFmpeg.
5 *
6 * FFmpeg is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2.1 of the License, or (at your option) any later version.
10 *
11 * FFmpeg is distributed in the hope that it will be useful,
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
17 * License along with FFmpeg; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19 */
20
21 #ifndef AVFORMAT_H
22 #define AVFORMAT_H
23
24 #ifdef __cplusplus
25 extern "C" {
26 #endif
27
28 #define LIBAVFORMAT_VERSION_INT ((51<<16)+(12<<8)+1)
29 #define LIBAVFORMAT_VERSION 51.12.1
30 #define LIBAVFORMAT_BUILD LIBAVFORMAT_VERSION_INT
31
32 #define LIBAVFORMAT_IDENT "Lavf" AV_STRINGIFY(LIBAVFORMAT_VERSION)
33
34 #include <time.h>
35 #include <stdio.h> /* FILE */
36 #include "avcodec.h"
37
38 #include "avio.h"
39
40 /* packet functions */
41
42 typedef struct AVPacket {
43 int64_t pts; ///< presentation time stamp in time_base units
44 int64_t dts; ///< decompression time stamp in time_base units
45 uint8_t *data;
46 int size;
47 int stream_index;
48 int flags;
49 int duration; ///< presentation duration in time_base units (0 if not available)
50 void (*destruct)(struct AVPacket *);
51 void *priv;
52 int64_t pos; ///< byte position in stream, -1 if unknown
53 } AVPacket;
54 #define PKT_FLAG_KEY 0x0001
55
56 void av_destruct_packet_nofree(AVPacket *pkt);
57
58 /**
59 * Default packet destructor.
60 */
61 void av_destruct_packet(AVPacket *pkt);
62
63 /* initialize optional fields of a packet */
64 static inline void av_init_packet(AVPacket *pkt)
65 {
66 pkt->pts = AV_NOPTS_VALUE;
67 pkt->dts = AV_NOPTS_VALUE;
68 pkt->pos = -1;
69 pkt->duration = 0;
70 pkt->flags = 0;
71 pkt->stream_index = 0;
72 pkt->destruct= av_destruct_packet_nofree;
73 }
74
75 /**
76 * Allocate the payload of a packet and intialized its fields to default values.
77 *
78 * @param pkt packet
79 * @param size wanted payload size
80 * @return 0 if OK. AVERROR_xxx otherwise.
81 */
82 int av_new_packet(AVPacket *pkt, int size);
83
84 /**
85 * Allocate and read the payload of a packet and intialized its fields to default values.
86 *
87 * @param pkt packet
88 * @param size wanted payload size
89 * @return >0 (read size) if OK. AVERROR_xxx otherwise.
90 */
91 int av_get_packet(ByteIOContext *s, AVPacket *pkt, int size);
92
93 /**
94 * @warning This is a hack - the packet memory allocation stuff is broken. The
95 * packet is allocated if it was not really allocated
96 */
97 int av_dup_packet(AVPacket *pkt);
98
99 /**
100 * Free a packet
101 *
102 * @param pkt packet to free
103 */
104 static inline void av_free_packet(AVPacket *pkt)
105 {
106 if (pkt && pkt->destruct) {
107 pkt->destruct(pkt);
108 }
109 }
110
111 /*************************************************/
112 /* fractional numbers for exact pts handling */
113
114 /* the exact value of the fractional number is: 'val + num / den'. num
115 is assumed to be such as 0 <= num < den */
116 typedef struct AVFrac {
117 int64_t val, num, den;
118 } AVFrac attribute_deprecated;
119
120 /*************************************************/
121 /* input/output formats */
122
123 struct AVCodecTag;
124
125 struct AVFormatContext;
126
127 /** this structure contains the data a format has to probe a file */
128 typedef struct AVProbeData {
129 const char *filename;
130 unsigned char *buf;
131 int buf_size;
132 } AVProbeData;
133
134 #define AVPROBE_SCORE_MAX 100 ///< max score, half of that is used for file extension based detection
135 #define AVPROBE_PADDING_SIZE 32 ///< extra allocated bytes at the end of the probe buffer
136
137 typedef struct AVFormatParameters {
138 AVRational time_base;
139 int sample_rate;
140 int channels;
141 int width;
142 int height;
143 enum PixelFormat pix_fmt;
144 int channel; /**< used to select dv channel */
145 #if LIBAVFORMAT_VERSION_INT < (52<<16)
146 const char *device; /**< video, audio or DV device */
147 #endif
148 const char *standard; /**< tv standard, NTSC, PAL, SECAM */
149 int mpeg2ts_raw:1; /**< force raw MPEG2 transport stream output, if possible */
150 int mpeg2ts_compute_pcr:1; /**< compute exact PCR for each transport
151 stream packet (only meaningful if
152 mpeg2ts_raw is TRUE */
153 int initial_pause:1; /**< do not begin to play the stream
154 immediately (RTSP only) */
155 int prealloced_context:1;
156 enum CodecID video_codec_id;
157 enum CodecID audio_codec_id;
158 } AVFormatParameters;
159
160 //! demuxer will use url_fopen, no opened file should be provided by the caller
161 #define AVFMT_NOFILE 0x0001
162 #define AVFMT_NEEDNUMBER 0x0002 /**< needs '%d' in filename */
163 #define AVFMT_SHOW_IDS 0x0008 /**< show format stream IDs numbers */
164 #define AVFMT_RAWPICTURE 0x0020 /**< format wants AVPicture structure for
165 raw picture data */
166 #define AVFMT_GLOBALHEADER 0x0040 /**< format wants global header */
167 #define AVFMT_NOTIMESTAMPS 0x0080 /**< format doesnt need / has any timestamps */
168 #define AVFMT_GENERIC_INDEX 0x0100 /**< use generic index building code */
169
170 typedef struct AVOutputFormat {
171 const char *name;
172 const char *long_name;
173 const char *mime_type;
174 const char *extensions; /**< comma separated filename extensions */
175 /** size of private data so that it can be allocated in the wrapper */
176 int priv_data_size;
177 /* output support */
178 enum CodecID audio_codec; /**< default audio codec */
179 enum CodecID video_codec; /**< default video codec */
180 int (*write_header)(struct AVFormatContext *);
181 int (*write_packet)(struct AVFormatContext *, AVPacket *pkt);
182 int (*write_trailer)(struct AVFormatContext *);
183 /** can use flags: AVFMT_NOFILE, AVFMT_NEEDNUMBER, AVFMT_GLOBALHEADER */
184 int flags;
185 /** currently only used to set pixel format if not YUV420P */
186 int (*set_parameters)(struct AVFormatContext *, AVFormatParameters *);
187 int (*interleave_packet)(struct AVFormatContext *, AVPacket *out, AVPacket *in, int flush);
188
189 /**
190 * list of supported codec_id-codec_tag pairs, ordered by "better choice first"
191 * the arrays are all CODEC_ID_NONE terminated
192 */
193 const struct AVCodecTag **codec_tag;
194
195 /* private fields */
196 struct AVOutputFormat *next;
197 } AVOutputFormat;
198
199 typedef struct AVInputFormat {
200 const char *name;
201 const char *long_name;
202 /** size of private data so that it can be allocated in the wrapper */
203 int priv_data_size;
204 /** tell if a given file has a chance of being parsing by this format */
205 int (*read_probe)(AVProbeData *);
206 /** read the format header and initialize the AVFormatContext
207 structure. Return 0 if OK. 'ap' if non NULL contains
208 additional paramters. Only used in raw format right
209 now. 'av_new_stream' should be called to create new streams. */
210 int (*read_header)(struct AVFormatContext *,
211 AVFormatParameters *ap);
212 /** read one packet and put it in 'pkt'. pts and flags are also
213 set. 'av_new_stream' can be called only if the flag
214 AVFMTCTX_NOHEADER is used. */
215 int (*read_packet)(struct AVFormatContext *, AVPacket *pkt);
216 /** close the stream. The AVFormatContext and AVStreams are not
217 freed by this function */
218 int (*read_close)(struct AVFormatContext *);
219 /**
220 * seek to a given timestamp relative to the frames in
221 * stream component stream_index
222 * @param stream_index must not be -1
223 * @param flags selects which direction should be preferred if no exact
224 * match is available
225 */
226 int (*read_seek)(struct AVFormatContext *,
227 int stream_index, int64_t timestamp, int flags);
228 /**
229 * gets the next timestamp in AV_TIME_BASE units.
230 */
231 int64_t (*read_timestamp)(struct AVFormatContext *s, int stream_index,
232 int64_t *pos, int64_t pos_limit);
233 /** can use flags: AVFMT_NOFILE, AVFMT_NEEDNUMBER */
234 int flags;
235 /** if extensions are defined, then no probe is done. You should
236 usually not use extension format guessing because it is not
237 reliable enough */
238 const char *extensions;
239 /** general purpose read only value that the format can use */
240 int value;
241
242 /** start/resume playing - only meaningful if using a network based format
243 (RTSP) */
244 int (*read_play)(struct AVFormatContext *);
245
246 /** pause playing - only meaningful if using a network based format
247 (RTSP) */
248 int (*read_pause)(struct AVFormatContext *);
249
250 const struct AVCodecTag **codec_tag;
251
252 /* private fields */
253 struct AVInputFormat *next;
254 } AVInputFormat;
255
256 enum AVStreamParseType {
257 AVSTREAM_PARSE_NONE,
258 AVSTREAM_PARSE_FULL, /**< full parsing and repack */
259 AVSTREAM_PARSE_HEADERS, /**< only parse headers, don't repack */
260 AVSTREAM_PARSE_TIMESTAMPS, /**< full parsing and interpolation of timestamps for frames not starting on packet boundary */
261 };
262
263 typedef struct AVIndexEntry {
264 int64_t pos;
265 int64_t timestamp;
266 #define AVINDEX_KEYFRAME 0x0001
267 int flags:2;
268 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)
269 int min_distance; /**< min distance between this and the previous keyframe, used to avoid unneeded searching */
270 } AVIndexEntry;
271
272 typedef struct AVStream {
273 int index; /**< stream index in AVFormatContext */
274 int id; /**< format specific stream id */
275 AVCodecContext *codec; /**< codec context */
276 /**
277 * real base frame rate of the stream.
278 * this is the lowest framerate with which all timestamps can be
279 * represented accurately (its the least common multiple of all
280 * framerates in the stream), Note, this value is just a guess!
281 * for example if the timebase is 1/90000 and all frames have either
282 * approximately 3600 or 1800 timer ticks then r_frame_rate will be 50/1
283 */
284 AVRational r_frame_rate;
285 void *priv_data;
286 #if LIBAVFORMAT_VERSION_INT < (52<<16)
287 /* internal data used in av_find_stream_info() */
288 int64_t codec_info_duration;
289 int codec_info_nb_frames;
290 #endif
291 /** encoding: PTS generation when outputing stream */
292 AVFrac pts;
293
294 /**
295 * this is the fundamental unit of time (in seconds) in terms
296 * of which frame timestamps are represented. for fixed-fps content,
297 * timebase should be 1/framerate and timestamp increments should be
298 * identically 1.
299 */
300 AVRational time_base;
301 int pts_wrap_bits; /**< number of bits in pts (used for wrapping control) */
302 /* ffmpeg.c private use */
303 int stream_copy; /**< if set, just copy stream */
304 enum AVDiscard discard; ///< selects which packets can be discarded at will and dont need to be demuxed
305 //FIXME move stuff to a flags field?
306 /** quality, as it has been removed from AVCodecContext and put in AVVideoFrame
307 * MN:dunno if thats the right place, for it */
308 float quality;
309 /** decoding: pts of the first frame of the stream, in stream time base. */
310 int64_t start_time;
311 /** decoding: duration of the stream, in stream time base. */
312 int64_t duration;
313
314 char language[4]; /** ISO 639 3-letter language code (empty string if undefined) */
315
316 /* av_read_frame() support */
317 enum AVStreamParseType need_parsing;
318 struct AVCodecParserContext *parser;
319
320 int64_t cur_dts;
321 int last_IP_duration;
322 int64_t last_IP_pts;
323 /* av_seek_frame() support */
324 AVIndexEntry *index_entries; /**< only used if the format does not
325 support seeking natively */
326 int nb_index_entries;
327 unsigned int index_entries_allocated_size;
328
329 int64_t nb_frames; ///< number of frames in this stream if known or 0
330
331 #define MAX_REORDER_DELAY 4
332 int64_t pts_buffer[MAX_REORDER_DELAY+1];
333 } AVStream;
334
335 #define AVFMTCTX_NOHEADER 0x0001 /**< signal that no header is present
336 (streams are added dynamically) */
337
338 #define MAX_STREAMS 20
339
340 /* format I/O context */
341 typedef struct AVFormatContext {
342 const AVClass *av_class; /**< set by av_alloc_format_context */
343 /* can only be iformat or oformat, not both at the same time */
344 struct AVInputFormat *iformat;
345 struct AVOutputFormat *oformat;
346 void *priv_data;
347 ByteIOContext pb;
348 unsigned int nb_streams;
349 AVStream *streams[MAX_STREAMS];
350 char filename[1024]; /**< input or output filename */
351 /* stream info */
352 int64_t timestamp;
353 char title[512];
354 char author[512];
355 char copyright[512];
356 char comment[512];
357 char album[512];
358 int year; /**< ID3 year, 0 if none */
359 int track; /**< track number, 0 if none */
360 char genre[32]; /**< ID3 genre */
361
362 int ctx_flags; /**< format specific flags, see AVFMTCTX_xx */
363 /* private data for pts handling (do not modify directly) */
364 /** This buffer is only needed when packets were already buffered but
365 not decoded, for example to get the codec parameters in mpeg
366 streams */
367 struct AVPacketList *packet_buffer;
368
369 /** decoding: position of the first frame of the component, in
370 AV_TIME_BASE fractional seconds. NEVER set this value directly:
371 it is deduced from the AVStream values. */
372 int64_t start_time;
373 /** decoding: duration of the stream, in AV_TIME_BASE fractional
374 seconds. NEVER set this value directly: it is deduced from the
375 AVStream values. */
376 int64_t duration;
377 /** decoding: total file size. 0 if unknown */
378 int64_t file_size;
379 /** decoding: total stream bitrate in bit/s, 0 if not
380 available. Never set it directly if the file_size and the
381 duration are known as ffmpeg can compute it automatically. */
382 int bit_rate;
383
384 /* av_read_frame() support */
385 AVStream *cur_st;
386 const uint8_t *cur_ptr;
387 int cur_len;
388 AVPacket cur_pkt;
389
390 /* av_seek_frame() support */
391 int64_t data_offset; /** offset of the first packet */
392 int index_built;
393
394 int mux_rate;
395 int packet_size;
396 int preload;
397 int max_delay;
398
399 #define AVFMT_NOOUTPUTLOOP -1
400 #define AVFMT_INFINITEOUTPUTLOOP 0
401 /** number of times to loop output in formats that support it */
402 int loop_output;
403
404 int flags;
405 #define AVFMT_FLAG_GENPTS 0x0001 ///< generate pts if missing even if it requires parsing future frames
406 #define AVFMT_FLAG_IGNIDX 0x0002 ///< ignore index
407
408 int loop_input;
409 /** decoding: size of data to probe; encoding unused */
410 unsigned int probesize;
411
412 /**
413 * maximum duration in AV_TIME_BASE units over which the input should be analyzed in av_find_stream_info()
414 */
415 int max_analyze_duration;
416
417 const uint8_t *key;
418 int keylen;
419 } AVFormatContext;
420
421 typedef struct AVPacketList {
422 AVPacket pkt;
423 struct AVPacketList *next;
424 } AVPacketList;
425
426 extern AVInputFormat *first_iformat;
427 extern AVOutputFormat *first_oformat;
428
429 enum CodecID av_guess_image2_codec(const char *filename);
430
431 /* XXX: use automatic init with either ELF sections or C file parser */
432 /* modules */
433
434 #include "rtp.h"
435
436 #include "rtsp.h"
437
438 /* utils.c */
439 void av_register_input_format(AVInputFormat *format);
440 void av_register_output_format(AVOutputFormat *format);
441 AVOutputFormat *guess_stream_format(const char *short_name,
442 const char *filename, const char *mime_type);
443 AVOutputFormat *guess_format(const char *short_name,
444 const char *filename, const char *mime_type);
445
446 /**
447 * Guesses the codec id based upon muxer and filename.
448 */
449 enum CodecID av_guess_codec(AVOutputFormat *fmt, const char *short_name,
450 const char *filename, const char *mime_type, enum CodecType type);
451
452 /**
453 * Send a nice hexadecimal dump of a buffer to the specified file stream.
454 *
455 * @param f The file stream pointer where the dump should be sent to.
456 * @param buf buffer
457 * @param size buffer size
458 *
459 * @see av_hex_dump_log, av_pkt_dump, av_pkt_dump_log
460 */
461 void av_hex_dump(FILE *f, uint8_t *buf, int size);
462
463 /**
464 * Send a nice hexadecimal dump of a buffer to the log.
465 *
466 * @param avcl A pointer to an arbitrary struct of which the first field is a
467 * pointer to an AVClass struct.
468 * @param level The importance level of the message, lower values signifying
469 * higher importance.
470 * @param buf buffer
471 * @param size buffer size
472 *
473 * @see av_hex_dump, av_pkt_dump, av_pkt_dump_log
474 */
475 void av_hex_dump_log(void *avcl, int level, uint8_t *buf, int size);
476
477 /**
478 * Send a nice dump of a packet to the specified file stream.
479 *
480 * @param f The file stream pointer where the dump should be sent to.
481 * @param pkt packet to dump
482 * @param dump_payload true if the payload must be displayed too
483 */
484 void av_pkt_dump(FILE *f, AVPacket *pkt, int dump_payload);
485
486 /**
487 * Send a nice dump of a packet to the log.
488 *
489 * @param avcl A pointer to an arbitrary struct of which the first field is a
490 * pointer to an AVClass struct.
491 * @param level The importance level of the message, lower values signifying
492 * higher importance.
493 * @param pkt packet to dump
494 * @param dump_payload true if the payload must be displayed too
495 */
496 void av_pkt_dump_log(void *avcl, int level, AVPacket *pkt, int dump_payload);
497
498 void av_register_all(void);
499
500 /** codec tag <-> codec id */
501 enum CodecID av_codec_get_id(const struct AVCodecTag **tags, unsigned int tag);
502 unsigned int av_codec_get_tag(const struct AVCodecTag **tags, enum CodecID id);
503
504 /* media file input */
505
506 /**
507 * finds AVInputFormat based on input format's short name.
508 */
509 AVInputFormat *av_find_input_format(const char *short_name);
510
511 /**
512 * Guess file format.
513 *
514 * @param is_opened whether the file is already opened, determines whether
515 * demuxers with or without AVFMT_NOFILE are probed
516 */
517 AVInputFormat *av_probe_input_format(AVProbeData *pd, int is_opened);
518
519 /**
520 * Allocates all the structures needed to read an input stream.
521 * This does not open the needed codecs for decoding the stream[s].
522 */
523 int av_open_input_stream(AVFormatContext **ic_ptr,
524 ByteIOContext *pb, const char *filename,
525 AVInputFormat *fmt, AVFormatParameters *ap);
526
527 /**
528 * Open a media file as input. The codec are not opened. Only the file
529 * header (if present) is read.
530 *
531 * @param ic_ptr the opened media file handle is put here
532 * @param filename filename to open.
533 * @param fmt if non NULL, force the file format to use
534 * @param buf_size optional buffer size (zero if default is OK)
535 * @param ap additional parameters needed when opening the file (NULL if default)
536 * @return 0 if OK. AVERROR_xxx otherwise.
537 */
538 int av_open_input_file(AVFormatContext **ic_ptr, const char *filename,
539 AVInputFormat *fmt,
540 int buf_size,
541 AVFormatParameters *ap);
542 /** no av_open for output, so applications will need this: */
543 AVFormatContext *av_alloc_format_context(void);
544
545 /**
546 * Read packets of a media file to get stream information. This
547 * is useful for file formats with no headers such as MPEG. This
548 * function also computes the real frame rate in case of mpeg2 repeat
549 * frame mode.
550 * The logical file position is not changed by this function;
551 * examined packets may be buffered for later processing.
552 *
553 * @param ic media file handle
554 * @return >=0 if OK. AVERROR_xxx if error.
555 * @todo let user decide somehow what information is needed so we dont waste time geting stuff the user doesnt need
556 */
557 int av_find_stream_info(AVFormatContext *ic);
558
559 /**
560 * Read a transport packet from a media file.
561 *
562 * This function is absolete and should never be used.
563 * Use av_read_frame() instead.
564 *
565 * @param s media file handle
566 * @param pkt is filled
567 * @return 0 if OK. AVERROR_xxx if error.
568 */
569 int av_read_packet(AVFormatContext *s, AVPacket *pkt);
570
571 /**
572 * Return the next frame of a stream.
573 *
574 * The returned packet is valid
575 * until the next av_read_frame() or until av_close_input_file() and
576 * must be freed with av_free_packet. For video, the packet contains
577 * exactly one frame. For audio, it contains an integer number of
578 * frames if each frame has a known fixed size (e.g. PCM or ADPCM
579 * data). If the audio frames have a variable size (e.g. MPEG audio),
580 * then it contains one frame.
581 *
582 * pkt->pts, pkt->dts and pkt->duration are always set to correct
583 * values in AVStream.timebase units (and guessed if the format cannot
584 * provided them). pkt->pts can be AV_NOPTS_VALUE if the video format
585 * has B frames, so it is better to rely on pkt->dts if you do not
586 * decompress the payload.
587 *
588 * @return 0 if OK, < 0 if error or end of file.
589 */
590 int av_read_frame(AVFormatContext *s, AVPacket *pkt);
591
592 /**
593 * Seek to the key frame at timestamp.
594 * 'timestamp' in 'stream_index'.
595 * @param stream_index If stream_index is (-1), a default
596 * stream is selected, and timestamp is automatically converted
597 * from AV_TIME_BASE units to the stream specific time_base.
598 * @param timestamp timestamp in AVStream.time_base units
599 * or if there is no stream specified then in AV_TIME_BASE units
600 * @param flags flags which select direction and seeking mode
601 * @return >= 0 on success
602 */
603 int av_seek_frame(AVFormatContext *s, int stream_index, int64_t timestamp, int flags);
604
605 /**
606 * start playing a network based stream (e.g. RTSP stream) at the
607 * current position
608 */
609 int av_read_play(AVFormatContext *s);
610
611 /**
612 * Pause a network based stream (e.g. RTSP stream).
613 *
614 * Use av_read_play() to resume it.
615 */
616 int av_read_pause(AVFormatContext *s);
617
618 /**
619 * Close a media file (but not its codecs).
620 *
621 * @param s media file handle
622 */
623 void av_close_input_file(AVFormatContext *s);
624
625 /**
626 * Add a new stream to a media file.
627 *
628 * Can only be called in the read_header() function. If the flag
629 * AVFMTCTX_NOHEADER is in the format context, then new streams
630 * can be added in read_packet too.
631 *
632 * @param s media file handle
633 * @param id file format dependent stream id
634 */
635 AVStream *av_new_stream(AVFormatContext *s, int id);
636
637 /**
638 * Set the pts for a given stream.
639 *
640 * @param s stream
641 * @param pts_wrap_bits number of bits effectively used by the pts
642 * (used for wrap control, 33 is the value for MPEG)
643 * @param pts_num numerator to convert to seconds (MPEG: 1)
644 * @param pts_den denominator to convert to seconds (MPEG: 90000)
645 */
646 void av_set_pts_info(AVStream *s, int pts_wrap_bits,
647 int pts_num, int pts_den);
648
649 #define AVSEEK_FLAG_BACKWARD 1 ///< seek backward
650 #define AVSEEK_FLAG_BYTE 2 ///< seeking based on position in bytes
651 #define AVSEEK_FLAG_ANY 4 ///< seek to any frame, even non keyframes
652
653 int av_find_default_stream_index(AVFormatContext *s);
654
655 /**
656 * Gets the index for a specific timestamp.
657 * @param flags if AVSEEK_FLAG_BACKWARD then the returned index will correspond to
658 * the timestamp which is <= the requested one, if backward is 0
659 * then it will be >=
660 * if AVSEEK_FLAG_ANY seek to any frame, only keyframes otherwise
661 * @return < 0 if no such timestamp could be found
662 */
663 int av_index_search_timestamp(AVStream *st, int64_t timestamp, int flags);
664
665 /**
666 * Add a index entry into a sorted list updateing if it is already there.
667 *
668 * @param timestamp timestamp in the timebase of the given stream
669 */
670 int av_add_index_entry(AVStream *st,
671 int64_t pos, int64_t timestamp, int size, int distance, int flags);
672
673 /**
674 * Does a binary search using av_index_search_timestamp() and AVCodec.read_timestamp().
675 * this isnt supposed to be called directly by a user application, but by demuxers
676 * @param target_ts target timestamp in the time base of the given stream
677 * @param stream_index stream number
678 */
679 int av_seek_frame_binary(AVFormatContext *s, int stream_index, int64_t target_ts, int flags);
680
681 /**
682 * Updates cur_dts of all streams based on given timestamp and AVStream.
683 *
684 * Stream ref_st unchanged, others set cur_dts in their native timebase
685 * only needed for timestamp wrapping or if (dts not set and pts!=dts)
686 * @param timestamp new dts expressed in time_base of param ref_st
687 * @param ref_st reference stream giving time_base of param timestamp
688 */
689 void av_update_cur_dts(AVFormatContext *s, AVStream *ref_st, int64_t timestamp);
690
691 /**
692 * Does a binary search using read_timestamp().
693 * this isnt supposed to be called directly by a user application, but by demuxers
694 * @param target_ts target timestamp in the time base of the given stream
695 * @param stream_index stream number
696 */
697 int64_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 ));
698
699 /** media file output */
700 int av_set_parameters(AVFormatContext *s, AVFormatParameters *ap);
701
702 /**
703 * allocate the stream private data and write the stream header to an
704 * output media file
705 *
706 * @param s media file handle
707 * @return 0 if OK. AVERROR_xxx if error.
708 */
709 int av_write_header(AVFormatContext *s);
710
711 /**
712 * Write a packet to an output media file.
713 *
714 * The packet shall contain one audio or video frame.
715 * The packet must be correctly interleaved according to the container specification,
716 * if not then av_interleaved_write_frame must be used
717 *
718 * @param s media file handle
719 * @param pkt the packet, which contains the stream_index, buf/buf_size, dts/pts, ...
720 * @return < 0 if error, = 0 if OK, 1 if end of stream wanted.
721 */
722 int av_write_frame(AVFormatContext *s, AVPacket *pkt);
723
724 /**
725 * Writes a packet to an output media file ensuring correct interleaving.
726 *
727 * The packet must contain one audio or video frame.
728 * If the packets are already correctly interleaved the application should
729 * call av_write_frame() instead as its slightly faster, its also important
730 * to keep in mind that completly non interleaved input will need huge amounts
731 * of memory to interleave with this, so its prefereable to interleave at the
732 * demuxer level
733 *
734 * @param s media file handle
735 * @param pkt the packet, which contains the stream_index, buf/buf_size, dts/pts, ...
736 * @return < 0 if error, = 0 if OK, 1 if end of stream wanted.
737 */
738 int av_interleaved_write_frame(AVFormatContext *s, AVPacket *pkt);
739
740 /**
741 * Interleave a packet per DTS in an output media file.
742 *
743 * Packets with pkt->destruct == av_destruct_packet will be freed inside this function,
744 * so they cannot be used after it, note calling av_free_packet() on them is still safe.
745 *
746 * @param s media file handle
747 * @param out the interleaved packet will be output here
748 * @param in the input packet
749 * @param flush 1 if no further packets are available as input and all
750 * remaining packets should be output
751 * @return 1 if a packet was output, 0 if no packet could be output,
752 * < 0 if an error occured
753 */
754 int av_interleave_packet_per_dts(AVFormatContext *s, AVPacket *out, AVPacket *pkt, int flush);
755
756 /**
757 * @brief Write the stream trailer to an output media file and
758 * free the file private data.
759 *
760 * @param s media file handle
761 * @return 0 if OK. AVERROR_xxx if error.
762 */
763 int av_write_trailer(AVFormatContext *s);
764
765 void dump_format(AVFormatContext *ic,
766 int index,
767 const char *url,
768 int is_output);
769
770 /**
771 * parses width and height out of string str.
772 */
773 int parse_image_size(int *width_ptr, int *height_ptr, const char *str);
774
775 /**
776 * Converts frame rate from string to a fraction.
777 */
778 int parse_frame_rate(int *frame_rate, int *frame_rate_base, const char *arg);
779
780 /**
781 * Converts date string to number of seconds since Jan 1st, 1970.
782 *
783 * @code
784 * Syntax:
785 * - If not a duration:
786 * [{YYYY-MM-DD|YYYYMMDD}]{T| }{HH[:MM[:SS[.m...]]][Z]|HH[MM[SS[.m...]]][Z]}
787 * Time is localtime unless Z is suffixed to the end. In this case GMT
788 * Return the date in micro seconds since 1970
789 *
790 * - If a duration:
791 * HH[:MM[:SS[.m...]]]
792 * S+[.m...]
793 * @endcode
794 */
795 int64_t parse_date(const char *datestr, int duration);
796
797 int64_t av_gettime(void);
798
799 /* ffm specific for ffserver */
800 #define FFM_PACKET_SIZE 4096
801 offset_t ffm_read_write_index(int fd);
802 void ffm_write_write_index(int fd, offset_t pos);
803 void ffm_set_write_index(AVFormatContext *s, offset_t pos, offset_t file_size);
804
805 /**
806 * Attempts to find a specific tag in a URL.
807 *
808 * syntax: '?tag1=val1&tag2=val2...'. Little URL decoding is done.
809 * Return 1 if found.
810 */
811 int find_info_tag(char *arg, int arg_size, const char *tag1, const char *info);
812
813 /**
814 * Returns in 'buf' the path with '%d' replaced by number.
815
816 * Also handles the '%0nd' format where 'n' is the total number
817 * of digits and '%%'.
818 *
819 * @param buf destination buffer
820 * @param buf_size destination buffer size
821 * @param path numbered sequence string
822 * @number frame number
823 * @return 0 if OK, -1 if format error.
824 */
825 int av_get_frame_filename(char *buf, int buf_size,
826 const char *path, int number);
827
828 /**
829 * Check whether filename actually is a numbered sequence generator.
830 *
831 * @param filename possible numbered sequence string
832 * @return 1 if a valid numbered sequence string, 0 otherwise.
833 */
834 int av_filename_number_test(const char *filename);
835
836 /* grab specific */
837 int video_grab_init(void);
838 int audio_init(void);
839
840 /* DV1394 */
841 int dv1394_init(void);
842 int dc1394_init(void);
843
844 #ifdef HAVE_AV_CONFIG_H
845
846 #include "os_support.h"
847
848 int strstart(const char *str, const char *val, const char **ptr);
849 int stristart(const char *str, const char *val, const char **ptr);
850 void pstrcpy(char *buf, int buf_size, const char *str);
851 char *pstrcat(char *buf, int buf_size, const char *s);
852
853 void __dynarray_add(unsigned long **tab_ptr, int *nb_ptr, unsigned long elem);
854
855 #ifdef __GNUC__
856 #define dynarray_add(tab, nb_ptr, elem)\
857 do {\
858 typeof(tab) _tab = (tab);\
859 typeof(elem) _elem = (elem);\
860 (void)sizeof(**_tab == _elem); /* check that types are compatible */\
861 __dynarray_add((unsigned long **)_tab, nb_ptr, (unsigned long)_elem);\
862 } while(0)
863 #else
864 #define dynarray_add(tab, nb_ptr, elem)\
865 do {\
866 __dynarray_add((unsigned long **)(tab), nb_ptr, (unsigned long)(elem));\
867 } while(0)
868 #endif
869
870 time_t mktimegm(struct tm *tm);
871 struct tm *brktimegm(time_t secs, struct tm *tm);
872 const char *small_strptime(const char *p, const char *fmt,
873 struct tm *dt);
874
875 struct in_addr;
876 int resolve_host(struct in_addr *sin_addr, const char *hostname);
877
878 void url_split(char *proto, int proto_size,
879 char *authorization, int authorization_size,
880 char *hostname, int hostname_size,
881 int *port_ptr,
882 char *path, int path_size,
883 const char *url);
884
885 int match_ext(const char *filename, const char *extensions);
886
887 #endif /* HAVE_AV_CONFIG_H */
888
889 #ifdef __cplusplus
890 }
891 #endif
892
893 #endif /* AVFORMAT_H */
894