Add extralibs to the dependency checker
[libav.git] / libavformat / avformat.h
... / ...
CommitLineData
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#define LIBAVFORMAT_VERSION_INT ((51<<16)+(13<<8)+3)
25#define LIBAVFORMAT_VERSION 51.13.3
26#define LIBAVFORMAT_BUILD LIBAVFORMAT_VERSION_INT
27
28#define LIBAVFORMAT_IDENT "Lavf" AV_STRINGIFY(LIBAVFORMAT_VERSION)
29
30#include <time.h>
31#include <stdio.h> /* FILE */
32#include "avcodec.h"
33
34#include "avio.h"
35
36/* packet functions */
37
38typedef struct AVPacket {
39 int64_t pts; ///< presentation time stamp in time_base units
40 int64_t dts; ///< decompression time stamp in time_base units
41 uint8_t *data;
42 int size;
43 int stream_index;
44 int flags;
45 int duration; ///< presentation duration in time_base units (0 if not available)
46 void (*destruct)(struct AVPacket *);
47 void *priv;
48 int64_t pos; ///< byte position in stream, -1 if unknown
49} AVPacket;
50#define PKT_FLAG_KEY 0x0001
51
52void av_destruct_packet_nofree(AVPacket *pkt);
53
54/**
55 * Default packet destructor.
56 */
57void av_destruct_packet(AVPacket *pkt);
58
59/**
60 * Initialize optional fields of a packet to default values.
61 *
62 * @param pkt packet
63 */
64void av_init_packet(AVPacket *pkt);
65
66/**
67 * Allocate the payload of a packet and initialize its fields to default values.
68 *
69 * @param pkt packet
70 * @param size wanted payload size
71 * @return 0 if OK. AVERROR_xxx otherwise.
72 */
73int av_new_packet(AVPacket *pkt, int size);
74
75/**
76 * Allocate and read the payload of a packet and initialize its fields to default values.
77 *
78 * @param pkt packet
79 * @param size wanted payload size
80 * @return >0 (read size) if OK. AVERROR_xxx otherwise.
81 */
82int av_get_packet(ByteIOContext *s, AVPacket *pkt, int size);
83
84/**
85 * @warning This is a hack - the packet memory allocation stuff is broken. The
86 * packet is allocated if it was not really allocated
87 */
88int av_dup_packet(AVPacket *pkt);
89
90/**
91 * Free a packet
92 *
93 * @param pkt packet to free
94 */
95static inline void av_free_packet(AVPacket *pkt)
96{
97 if (pkt && pkt->destruct) {
98 pkt->destruct(pkt);
99 }
100}
101
102/*************************************************/
103/* fractional numbers for exact pts handling */
104
105/**
106 * the exact value of the fractional number is: 'val + num / den'.
107 * num is assumed to be such as 0 <= num < den
108 * @deprecated Use AVRational instead
109*/
110typedef struct AVFrac {
111 int64_t val, num, den;
112} AVFrac attribute_deprecated;
113
114/*************************************************/
115/* input/output formats */
116
117struct AVCodecTag;
118
119struct AVFormatContext;
120
121/** this structure contains the data a format has to probe a file */
122typedef struct AVProbeData {
123 const char *filename;
124 unsigned char *buf;
125 int buf_size;
126} AVProbeData;
127
128#define AVPROBE_SCORE_MAX 100 ///< max score, half of that is used for file extension based detection
129#define AVPROBE_PADDING_SIZE 32 ///< extra allocated bytes at the end of the probe buffer
130
131typedef struct AVFormatParameters {
132 AVRational time_base;
133 int sample_rate;
134 int channels;
135 int width;
136 int height;
137 enum PixelFormat pix_fmt;
138 int channel; /**< used to select dv channel */
139#if LIBAVFORMAT_VERSION_INT < (52<<16)
140 const char *device; /**< video, audio or DV device */
141#endif
142 const char *standard; /**< tv standard, NTSC, PAL, SECAM */
143 int mpeg2ts_raw:1; /**< force raw MPEG2 transport stream output, if possible */
144 int mpeg2ts_compute_pcr:1; /**< compute exact PCR for each transport
145 stream packet (only meaningful if
146 mpeg2ts_raw is TRUE) */
147 int initial_pause:1; /**< do not begin to play the stream
148 immediately (RTSP only) */
149 int prealloced_context:1;
150 enum CodecID video_codec_id;
151 enum CodecID audio_codec_id;
152} AVFormatParameters;
153
154//! demuxer will use url_fopen, no opened file should be provided by the caller
155#define AVFMT_NOFILE 0x0001
156#define AVFMT_NEEDNUMBER 0x0002 /**< needs '%d' in filename */
157#define AVFMT_SHOW_IDS 0x0008 /**< show format stream IDs numbers */
158#define AVFMT_RAWPICTURE 0x0020 /**< format wants AVPicture structure for
159 raw picture data */
160#define AVFMT_GLOBALHEADER 0x0040 /**< format wants global header */
161#define AVFMT_NOTIMESTAMPS 0x0080 /**< format does not need / have any timestamps */
162#define AVFMT_GENERIC_INDEX 0x0100 /**< use generic index building code */
163
164typedef struct AVOutputFormat {
165 const char *name;
166 const char *long_name;
167 const char *mime_type;
168 const char *extensions; /**< comma separated filename extensions */
169 /** size of private data so that it can be allocated in the wrapper */
170 int priv_data_size;
171 /* output support */
172 enum CodecID audio_codec; /**< default audio codec */
173 enum CodecID video_codec; /**< default video codec */
174 int (*write_header)(struct AVFormatContext *);
175 int (*write_packet)(struct AVFormatContext *, AVPacket *pkt);
176 int (*write_trailer)(struct AVFormatContext *);
177 /** can use flags: AVFMT_NOFILE, AVFMT_NEEDNUMBER, AVFMT_GLOBALHEADER */
178 int flags;
179 /** currently only used to set pixel format if not YUV420P */
180 int (*set_parameters)(struct AVFormatContext *, AVFormatParameters *);
181 int (*interleave_packet)(struct AVFormatContext *, AVPacket *out, AVPacket *in, int flush);
182
183 /**
184 * list of supported codec_id-codec_tag pairs, ordered by "better choice first"
185 * the arrays are all CODEC_ID_NONE terminated
186 */
187 const struct AVCodecTag **codec_tag;
188
189 enum CodecID subtitle_codec; /**< default subtitle codec */
190
191 /* private fields */
192 struct AVOutputFormat *next;
193} AVOutputFormat;
194
195typedef struct AVInputFormat {
196 const char *name;
197 const char *long_name;
198 /** size of private data so that it can be allocated in the wrapper */
199 int priv_data_size;
200 /**
201 * tell if a given file has a chance of being parsed by this format.
202 * The buffer provided is guranteed to be AVPROBE_PADDING_SIZE bytes big
203 * so you dont have to check for that unless you need more.
204 */
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 * @return >= 0 on success (but not necessarily the new offset)
226 */
227 int (*read_seek)(struct AVFormatContext *,
228 int stream_index, int64_t timestamp, int flags);
229 /**
230 * gets the next timestamp in AV_TIME_BASE units.
231 */
232 int64_t (*read_timestamp)(struct AVFormatContext *s, int stream_index,
233 int64_t *pos, int64_t pos_limit);
234 /** can use flags: AVFMT_NOFILE, AVFMT_NEEDNUMBER */
235 int flags;
236 /** if extensions are defined, then no probe is done. You should
237 usually not use extension format guessing because it is not
238 reliable enough */
239 const char *extensions;
240 /** general purpose read only value that the format can use */
241 int value;
242
243 /** start/resume playing - only meaningful if using a network based format
244 (RTSP) */
245 int (*read_play)(struct AVFormatContext *);
246
247 /** pause playing - only meaningful if using a network based format
248 (RTSP) */
249 int (*read_pause)(struct AVFormatContext *);
250
251 const struct AVCodecTag **codec_tag;
252
253 /* private fields */
254 struct AVInputFormat *next;
255} AVInputFormat;
256
257enum AVStreamParseType {
258 AVSTREAM_PARSE_NONE,
259 AVSTREAM_PARSE_FULL, /**< full parsing and repack */
260 AVSTREAM_PARSE_HEADERS, /**< only parse headers, don't repack */
261 AVSTREAM_PARSE_TIMESTAMPS, /**< full parsing and interpolation of timestamps for frames not starting on packet boundary */
262};
263
264typedef struct AVIndexEntry {
265 int64_t pos;
266 int64_t timestamp;
267#define AVINDEX_KEYFRAME 0x0001
268 int flags:2;
269 int size:30; //Yeah, trying to keep the size of this small to reduce memory requirements (it is 24 vs 32 byte due to possible 8byte align).
270 int min_distance; /**< min distance between this and the previous keyframe, used to avoid unneeded searching */
271} AVIndexEntry;
272
273typedef struct AVStream {
274 int index; /**< stream index in AVFormatContext */
275 int id; /**< format specific stream id */
276 AVCodecContext *codec; /**< codec context */
277 /**
278 * real base frame rate of the stream.
279 * this is the lowest framerate with which all timestamps can be
280 * represented accurately (it is the least common multiple of all
281 * framerates in the stream), Note, this value is just a guess!
282 * for example if the timebase is 1/90000 and all frames have either
283 * approximately 3600 or 1800 timer ticks then r_frame_rate will be 50/1
284 */
285 AVRational r_frame_rate;
286 void *priv_data;
287
288 /* internal data used in av_find_stream_info() */
289 int64_t first_dts;
290#if LIBAVFORMAT_VERSION_INT < (52<<16)
291 int codec_info_nb_frames;
292#endif
293 /** encoding: PTS generation when outputing stream */
294 struct AVFrac pts;
295
296 /**
297 * this is the fundamental unit of time (in seconds) in terms
298 * of which frame timestamps are represented. for fixed-fps content,
299 * timebase should be 1/framerate and timestamp increments should be
300 * identically 1.
301 */
302 AVRational time_base;
303 int pts_wrap_bits; /**< number of bits in pts (used for wrapping control) */
304 /* ffmpeg.c private use */
305 int stream_copy; /**< if set, just copy stream */
306 enum AVDiscard discard; ///< selects which packets can be discarded at will and do not need to be demuxed
307 //FIXME move stuff to a flags field?
308 /** quality, as it has been removed from AVCodecContext and put in AVVideoFrame
309 * MN: dunno if that is the right place for it */
310 float quality;
311 /**
312 * decoding: pts of the first frame of the stream, in stream time base.
313 * only set this if you are absolutely 100% sure that the value you set
314 * it to really is the pts of the first frame
315 * This may be undefined (AV_NOPTS_VALUE).
316 * @note the ASF header does NOT contain a correct start_time the ASF
317 * demuxer must NOT set this
318 */
319 int64_t start_time;
320 /**
321 * decoding: duration of the stream, in stream time base.
322 * If a source file does not specify a duration, but does specify
323 * a bitrate, this value will be estimates from bit rate and file size.
324 */
325 int64_t duration;
326
327 char language[4]; /** ISO 639 3-letter language code (empty string if undefined) */
328
329 /* av_read_frame() support */
330 enum AVStreamParseType need_parsing;
331 struct AVCodecParserContext *parser;
332
333 int64_t cur_dts;
334 int last_IP_duration;
335 int64_t last_IP_pts;
336 /* av_seek_frame() support */
337 AVIndexEntry *index_entries; /**< only used if the format does not
338 support seeking natively */
339 int nb_index_entries;
340 unsigned int index_entries_allocated_size;
341
342 int64_t nb_frames; ///< number of frames in this stream if known or 0
343
344#define MAX_REORDER_DELAY 4
345 int64_t pts_buffer[MAX_REORDER_DELAY+1];
346} AVStream;
347
348#define AVFMTCTX_NOHEADER 0x0001 /**< signal that no header is present
349 (streams are added dynamically) */
350
351#define MAX_STREAMS 20
352
353/* format I/O context */
354typedef struct AVFormatContext {
355 const AVClass *av_class; /**< set by av_alloc_format_context */
356 /* can only be iformat or oformat, not both at the same time */
357 struct AVInputFormat *iformat;
358 struct AVOutputFormat *oformat;
359 void *priv_data;
360 ByteIOContext pb;
361 unsigned int nb_streams;
362 AVStream *streams[MAX_STREAMS];
363 char filename[1024]; /**< input or output filename */
364 /* stream info */
365 int64_t timestamp;
366 char title[512];
367 char author[512];
368 char copyright[512];
369 char comment[512];
370 char album[512];
371 int year; /**< ID3 year, 0 if none */
372 int track; /**< track number, 0 if none */
373 char genre[32]; /**< ID3 genre */
374
375 int ctx_flags; /**< format specific flags, see AVFMTCTX_xx */
376 /* private data for pts handling (do not modify directly) */
377 /** This buffer is only needed when packets were already buffered but
378 not decoded, for example to get the codec parameters in mpeg
379 streams */
380 struct AVPacketList *packet_buffer;
381
382 /** decoding: position of the first frame of the component, in
383 AV_TIME_BASE fractional seconds. NEVER set this value directly:
384 it is deduced from the AVStream values. */
385 int64_t start_time;
386 /** decoding: duration of the stream, in AV_TIME_BASE fractional
387 seconds. NEVER set this value directly: it is deduced from the
388 AVStream values. */
389 int64_t duration;
390 /** decoding: total file size. 0 if unknown */
391 int64_t file_size;
392 /** decoding: total stream bitrate in bit/s, 0 if not
393 available. Never set it directly if the file_size and the
394 duration are known as ffmpeg can compute it automatically. */
395 int bit_rate;
396
397 /* av_read_frame() support */
398 AVStream *cur_st;
399 const uint8_t *cur_ptr;
400 int cur_len;
401 AVPacket cur_pkt;
402
403 /* av_seek_frame() support */
404 int64_t data_offset; /** offset of the first packet */
405 int index_built;
406
407 int mux_rate;
408 int packet_size;
409 int preload;
410 int max_delay;
411
412#define AVFMT_NOOUTPUTLOOP -1
413#define AVFMT_INFINITEOUTPUTLOOP 0
414 /** number of times to loop output in formats that support it */
415 int loop_output;
416
417 int flags;
418#define AVFMT_FLAG_GENPTS 0x0001 ///< generate pts if missing even if it requires parsing future frames
419#define AVFMT_FLAG_IGNIDX 0x0002 ///< ignore index
420#define AVFMT_FLAG_NONBLOCK 0x0004 ///< do not block when reading packets from input
421
422 int loop_input;
423 /** decoding: size of data to probe; encoding unused */
424 unsigned int probesize;
425
426 /**
427 * maximum duration in AV_TIME_BASE units over which the input should be analyzed in av_find_stream_info()
428 */
429 int max_analyze_duration;
430
431 const uint8_t *key;
432 int keylen;
433} AVFormatContext;
434
435typedef struct AVPacketList {
436 AVPacket pkt;
437 struct AVPacketList *next;
438} AVPacketList;
439
440extern AVInputFormat *first_iformat;
441extern AVOutputFormat *first_oformat;
442
443enum CodecID av_guess_image2_codec(const char *filename);
444
445/* XXX: use automatic init with either ELF sections or C file parser */
446/* modules */
447
448#include "rtp.h"
449
450#include "rtsp.h"
451
452/* utils.c */
453void av_register_input_format(AVInputFormat *format);
454void av_register_output_format(AVOutputFormat *format);
455AVOutputFormat *guess_stream_format(const char *short_name,
456 const char *filename, const char *mime_type);
457AVOutputFormat *guess_format(const char *short_name,
458 const char *filename, const char *mime_type);
459
460/**
461 * Guesses the codec id based upon muxer and filename.
462 */
463enum CodecID av_guess_codec(AVOutputFormat *fmt, const char *short_name,
464 const char *filename, const char *mime_type, enum CodecType type);
465
466/**
467 * Send a nice hexadecimal dump of a buffer to the specified file stream.
468 *
469 * @param f The file stream pointer where the dump should be sent to.
470 * @param buf buffer
471 * @param size buffer size
472 *
473 * @see av_hex_dump_log, av_pkt_dump, av_pkt_dump_log
474 */
475void av_hex_dump(FILE *f, uint8_t *buf, int size);
476
477/**
478 * Send a nice hexadecimal dump of a buffer to the log.
479 *
480 * @param avcl A pointer to an arbitrary struct of which the first field is a
481 * pointer to an AVClass struct.
482 * @param level The importance level of the message, lower values signifying
483 * higher importance.
484 * @param buf buffer
485 * @param size buffer size
486 *
487 * @see av_hex_dump, av_pkt_dump, av_pkt_dump_log
488 */
489void av_hex_dump_log(void *avcl, int level, uint8_t *buf, int size);
490
491/**
492 * Send a nice dump of a packet to the specified file stream.
493 *
494 * @param f The file stream pointer where the dump should be sent to.
495 * @param pkt packet to dump
496 * @param dump_payload true if the payload must be displayed too
497 */
498void av_pkt_dump(FILE *f, AVPacket *pkt, int dump_payload);
499
500/**
501 * Send a nice dump of a packet to the log.
502 *
503 * @param avcl A pointer to an arbitrary struct of which the first field is a
504 * pointer to an AVClass struct.
505 * @param level The importance level of the message, lower values signifying
506 * higher importance.
507 * @param pkt packet to dump
508 * @param dump_payload true if the payload must be displayed too
509 */
510void av_pkt_dump_log(void *avcl, int level, AVPacket *pkt, int dump_payload);
511
512void av_register_all(void);
513
514/** codec tag <-> codec id */
515enum CodecID av_codec_get_id(const struct AVCodecTag **tags, unsigned int tag);
516unsigned int av_codec_get_tag(const struct AVCodecTag **tags, enum CodecID id);
517
518/* media file input */
519
520/**
521 * finds AVInputFormat based on input format's short name.
522 */
523AVInputFormat *av_find_input_format(const char *short_name);
524
525/**
526 * Guess file format.
527 *
528 * @param is_opened whether the file is already opened, determines whether
529 * demuxers with or without AVFMT_NOFILE are probed
530 */
531AVInputFormat *av_probe_input_format(AVProbeData *pd, int is_opened);
532
533/**
534 * Allocates all the structures needed to read an input stream.
535 * This does not open the needed codecs for decoding the stream[s].
536 */
537int av_open_input_stream(AVFormatContext **ic_ptr,
538 ByteIOContext *pb, const char *filename,
539 AVInputFormat *fmt, AVFormatParameters *ap);
540
541/**
542 * Open a media file as input. The codecs are not opened. Only the file
543 * header (if present) is read.
544 *
545 * @param ic_ptr the opened media file handle is put here
546 * @param filename filename to open.
547 * @param fmt if non NULL, force the file format to use
548 * @param buf_size optional buffer size (zero if default is OK)
549 * @param ap additional parameters needed when opening the file (NULL if default)
550 * @return 0 if OK. AVERROR_xxx otherwise.
551 */
552int av_open_input_file(AVFormatContext **ic_ptr, const char *filename,
553 AVInputFormat *fmt,
554 int buf_size,
555 AVFormatParameters *ap);
556/** no av_open for output, so applications will need this: */
557AVFormatContext *av_alloc_format_context(void);
558
559/**
560 * Read packets of a media file to get stream information. This
561 * is useful for file formats with no headers such as MPEG. This
562 * function also computes the real frame rate in case of mpeg2 repeat
563 * frame mode.
564 * The logical file position is not changed by this function;
565 * examined packets may be buffered for later processing.
566 *
567 * @param ic media file handle
568 * @return >=0 if OK. AVERROR_xxx if error.
569 * @todo Let user decide somehow what information is needed so we do not waste time geting stuff the user does not need.
570 */
571int av_find_stream_info(AVFormatContext *ic);
572
573/**
574 * Read a transport packet from a media file.
575 *
576 * This function is obsolete and should never be used.
577 * Use av_read_frame() instead.
578 *
579 * @param s media file handle
580 * @param pkt is filled
581 * @return 0 if OK. AVERROR_xxx if error.
582 */
583int av_read_packet(AVFormatContext *s, AVPacket *pkt);
584
585/**
586 * Return the next frame of a stream.
587 *
588 * The returned packet is valid
589 * until the next av_read_frame() or until av_close_input_file() and
590 * must be freed with av_free_packet. For video, the packet contains
591 * exactly one frame. For audio, it contains an integer number of
592 * frames if each frame has a known fixed size (e.g. PCM or ADPCM
593 * data). If the audio frames have a variable size (e.g. MPEG audio),
594 * then it contains one frame.
595 *
596 * pkt->pts, pkt->dts and pkt->duration are always set to correct
597 * values in AVStream.timebase units (and guessed if the format cannot
598 * provided them). pkt->pts can be AV_NOPTS_VALUE if the video format
599 * has B frames, so it is better to rely on pkt->dts if you do not
600 * decompress the payload.
601 *
602 * @return 0 if OK, < 0 if error or end of file.
603 */
604int av_read_frame(AVFormatContext *s, AVPacket *pkt);
605
606/**
607 * Seek to the key frame at timestamp.
608 * 'timestamp' in 'stream_index'.
609 * @param stream_index If stream_index is (-1), a default
610 * stream is selected, and timestamp is automatically converted
611 * from AV_TIME_BASE units to the stream specific time_base.
612 * @param timestamp timestamp in AVStream.time_base units
613 * or if there is no stream specified then in AV_TIME_BASE units
614 * @param flags flags which select direction and seeking mode
615 * @return >= 0 on success
616 */
617int av_seek_frame(AVFormatContext *s, int stream_index, int64_t timestamp, int flags);
618
619/**
620 * start playing a network based stream (e.g. RTSP stream) at the
621 * current position
622 */
623int av_read_play(AVFormatContext *s);
624
625/**
626 * Pause a network based stream (e.g. RTSP stream).
627 *
628 * Use av_read_play() to resume it.
629 */
630int av_read_pause(AVFormatContext *s);
631
632/**
633 * Close a media file (but not its codecs).
634 *
635 * @param s media file handle
636 */
637void av_close_input_file(AVFormatContext *s);
638
639/**
640 * Add a new stream to a media file.
641 *
642 * Can only be called in the read_header() function. If the flag
643 * AVFMTCTX_NOHEADER is in the format context, then new streams
644 * can be added in read_packet too.
645 *
646 * @param s media file handle
647 * @param id file format dependent stream id
648 */
649AVStream *av_new_stream(AVFormatContext *s, int id);
650
651/**
652 * Set the pts for a given stream.
653 *
654 * @param s stream
655 * @param pts_wrap_bits number of bits effectively used by the pts
656 * (used for wrap control, 33 is the value for MPEG)
657 * @param pts_num numerator to convert to seconds (MPEG: 1)
658 * @param pts_den denominator to convert to seconds (MPEG: 90000)
659 */
660void av_set_pts_info(AVStream *s, int pts_wrap_bits,
661 int pts_num, int pts_den);
662
663#define AVSEEK_FLAG_BACKWARD 1 ///< seek backward
664#define AVSEEK_FLAG_BYTE 2 ///< seeking based on position in bytes
665#define AVSEEK_FLAG_ANY 4 ///< seek to any frame, even non keyframes
666
667int av_find_default_stream_index(AVFormatContext *s);
668
669/**
670 * Gets the index for a specific timestamp.
671 * @param flags if AVSEEK_FLAG_BACKWARD then the returned index will correspond to
672 * the timestamp which is <= the requested one, if backward is 0
673 * then it will be >=
674 * if AVSEEK_FLAG_ANY seek to any frame, only keyframes otherwise
675 * @return < 0 if no such timestamp could be found
676 */
677int av_index_search_timestamp(AVStream *st, int64_t timestamp, int flags);
678
679/**
680 * Add a index entry into a sorted list updateing if it is already there.
681 *
682 * @param timestamp timestamp in the timebase of the given stream
683 */
684int av_add_index_entry(AVStream *st,
685 int64_t pos, int64_t timestamp, int size, int distance, int flags);
686
687/**
688 * Does a binary search using av_index_search_timestamp() and AVCodec.read_timestamp().
689 * This is not supposed to be called directly by a user application, but by demuxers.
690 * @param target_ts target timestamp in the time base of the given stream
691 * @param stream_index stream number
692 */
693int av_seek_frame_binary(AVFormatContext *s, int stream_index, int64_t target_ts, int flags);
694
695/**
696 * Updates cur_dts of all streams based on given timestamp and AVStream.
697 *
698 * Stream ref_st unchanged, others set cur_dts in their native timebase
699 * only needed for timestamp wrapping or if (dts not set and pts!=dts).
700 * @param timestamp new dts expressed in time_base of param ref_st
701 * @param ref_st reference stream giving time_base of param timestamp
702 */
703void av_update_cur_dts(AVFormatContext *s, AVStream *ref_st, int64_t timestamp);
704
705/**
706 * Does a binary search using read_timestamp().
707 * This is not supposed to be called directly by a user application, but by demuxers.
708 * @param target_ts target timestamp in the time base of the given stream
709 * @param stream_index stream number
710 */
711int64_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 ));
712
713/** media file output */
714int av_set_parameters(AVFormatContext *s, AVFormatParameters *ap);
715
716/**
717 * Allocate the stream private data and write the stream header to an
718 * output media file.
719 *
720 * @param s media file handle
721 * @return 0 if OK. AVERROR_xxx if error.
722 */
723int av_write_header(AVFormatContext *s);
724
725/**
726 * Write a packet to an output media file.
727 *
728 * The packet shall contain one audio or video frame.
729 * The packet must be correctly interleaved according to the container specification,
730 * if not then av_interleaved_write_frame must be used
731 *
732 * @param s media file handle
733 * @param pkt the packet, which contains the stream_index, buf/buf_size, dts/pts, ...
734 * @return < 0 if error, = 0 if OK, 1 if end of stream wanted.
735 */
736int av_write_frame(AVFormatContext *s, AVPacket *pkt);
737
738/**
739 * Writes a packet to an output media file ensuring correct interleaving.
740 *
741 * The packet must contain one audio or video frame.
742 * If the packets are already correctly interleaved the application should
743 * call av_write_frame() instead as it is slightly faster. It is also important
744 * to keep in mind that completely non-interleaved input will need huge amounts
745 * of memory to interleave with this, so it is preferable to interleave at the
746 * demuxer level.
747 *
748 * @param s media file handle
749 * @param pkt the packet, which contains the stream_index, buf/buf_size, dts/pts, ...
750 * @return < 0 if error, = 0 if OK, 1 if end of stream wanted.
751 */
752int av_interleaved_write_frame(AVFormatContext *s, AVPacket *pkt);
753
754/**
755 * Interleave a packet per DTS in an output media file.
756 *
757 * Packets with pkt->destruct == av_destruct_packet will be freed inside this function,
758 * so they cannot be used after it, note calling av_free_packet() on them is still safe.
759 *
760 * @param s media file handle
761 * @param out the interleaved packet will be output here
762 * @param in the input packet
763 * @param flush 1 if no further packets are available as input and all
764 * remaining packets should be output
765 * @return 1 if a packet was output, 0 if no packet could be output,
766 * < 0 if an error occured
767 */
768int av_interleave_packet_per_dts(AVFormatContext *s, AVPacket *out, AVPacket *pkt, int flush);
769
770/**
771 * @brief Write the stream trailer to an output media file and
772 * free the file private data.
773 *
774 * @param s media file handle
775 * @return 0 if OK. AVERROR_xxx if error.
776 */
777int av_write_trailer(AVFormatContext *s);
778
779void dump_format(AVFormatContext *ic,
780 int index,
781 const char *url,
782 int is_output);
783
784/**
785 * parses width and height out of string str.
786 * @deprecated Use av_parse_video_frame_size instead.
787 */
788attribute_deprecated int parse_image_size(int *width_ptr, int *height_ptr, const char *str);
789
790/**
791 * Converts frame rate from string to a fraction.
792 * @deprecated Use av_parse_video_frame_rate instead.
793 */
794attribute_deprecated int parse_frame_rate(int *frame_rate, int *frame_rate_base, const char *arg);
795
796/**
797 * Converts date string to number of seconds since Jan 1st, 1970.
798 *
799 * @code
800 * Syntax:
801 * - If not a duration:
802 * [{YYYY-MM-DD|YYYYMMDD}]{T| }{HH[:MM[:SS[.m...]]][Z]|HH[MM[SS[.m...]]][Z]}
803 * Time is localtime unless Z is suffixed to the end. In this case GMT
804 * Return the date in micro seconds since 1970
805 *
806 * - If a duration:
807 * HH[:MM[:SS[.m...]]]
808 * S+[.m...]
809 * @endcode
810 */
811int64_t parse_date(const char *datestr, int duration);
812
813int64_t av_gettime(void);
814
815/* ffm specific for ffserver */
816#define FFM_PACKET_SIZE 4096
817offset_t ffm_read_write_index(int fd);
818void ffm_write_write_index(int fd, offset_t pos);
819void ffm_set_write_index(AVFormatContext *s, offset_t pos, offset_t file_size);
820
821/**
822 * Attempts to find a specific tag in a URL.
823 *
824 * syntax: '?tag1=val1&tag2=val2...'. Little URL decoding is done.
825 * Return 1 if found.
826 */
827int find_info_tag(char *arg, int arg_size, const char *tag1, const char *info);
828
829/**
830 * Returns in 'buf' the path with '%d' replaced by number.
831
832 * Also handles the '%0nd' format where 'n' is the total number
833 * of digits and '%%'.
834 *
835 * @param buf destination buffer
836 * @param buf_size destination buffer size
837 * @param path numbered sequence string
838 * @number frame number
839 * @return 0 if OK, -1 if format error.
840 */
841int av_get_frame_filename(char *buf, int buf_size,
842 const char *path, int number);
843
844/**
845 * Check whether filename actually is a numbered sequence generator.
846 *
847 * @param filename possible numbered sequence string
848 * @return 1 if a valid numbered sequence string, 0 otherwise.
849 */
850int av_filename_number_test(const char *filename);
851
852/**
853 * Generate an SDP for an RTP session.
854 *
855 * @param ac array of AVFormatContexts describing the RTP streams. If the
856 * array is composed by only one context, such context can contain
857 * multiple AVStreams (one AVStream per RTP stream). Otherwise,
858 * all the contexts in the array (an AVCodecContext per RTP stream)
859 * must contain only one AVStream
860 * @param n_files number of AVCodecContexts contained in ac
861 * @param buff buffer where the SDP will be stored (must be allocated by
862 * the caller
863 * @param size the size of the buffer
864 * @return 0 if OK. AVERROR_xxx if error.
865 */
866int avf_sdp_create(AVFormatContext *ac[], int n_files, char *buff, int size);
867
868#ifdef HAVE_AV_CONFIG_H
869
870#include "os_support.h"
871
872void __dynarray_add(unsigned long **tab_ptr, int *nb_ptr, unsigned long elem);
873
874#ifdef __GNUC__
875#define dynarray_add(tab, nb_ptr, elem)\
876do {\
877 typeof(tab) _tab = (tab);\
878 typeof(elem) _elem = (elem);\
879 (void)sizeof(**_tab == _elem); /* check that types are compatible */\
880 __dynarray_add((unsigned long **)_tab, nb_ptr, (unsigned long)_elem);\
881} while(0)
882#else
883#define dynarray_add(tab, nb_ptr, elem)\
884do {\
885 __dynarray_add((unsigned long **)(tab), nb_ptr, (unsigned long)(elem));\
886} while(0)
887#endif
888
889time_t mktimegm(struct tm *tm);
890struct tm *brktimegm(time_t secs, struct tm *tm);
891const char *small_strptime(const char *p, const char *fmt,
892 struct tm *dt);
893
894struct in_addr;
895int resolve_host(struct in_addr *sin_addr, const char *hostname);
896
897void url_split(char *proto, int proto_size,
898 char *authorization, int authorization_size,
899 char *hostname, int hostname_size,
900 int *port_ptr,
901 char *path, int path_size,
902 const char *url);
903
904int match_ext(const char *filename, const char *extensions);
905
906#endif /* HAVE_AV_CONFIG_H */
907
908#endif /* AVFORMAT_H */
909