Statistics
| Branch: | Revision:

ffmpeg / libavformat / avformat.h @ bf4a1f17

History | View | Annotate | Download (31.6 KB)

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

    
38
typedef 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

    
52
void av_destruct_packet_nofree(AVPacket *pkt);
53

    
54
/**
55
 * Default packet destructor.
56
 */
57
void av_destruct_packet(AVPacket *pkt);
58

    
59
/**
60
 * Initialize optional fields of a packet to default values.
61
 *
62
 * @param pkt packet
63
 */
64
void 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
 */
73
int 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
 */
82
int 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
 */
88
int av_dup_packet(AVPacket *pkt);
89

    
90
/**
91
 * Free a packet
92
 *
93
 * @param pkt packet to free
94
 */
95
static 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
*/
110
typedef struct AVFrac {
111
    int64_t val, num, den;
112
} AVFrac attribute_deprecated;
113

    
114
/*************************************************/
115
/* input/output formats */
116

    
117
struct AVCodecTag;
118

    
119
struct AVFormatContext;
120

    
121
/** this structure contains the data a format has to probe a file */
122
typedef 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

    
131
typedef 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

    
164
typedef 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

    
195
typedef 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

    
257
enum 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

    
264
typedef 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

    
273
typedef 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 */
354
typedef 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

    
435
typedef struct AVPacketList {
436
    AVPacket pkt;
437
    struct AVPacketList *next;
438
} AVPacketList;
439

    
440
extern AVInputFormat *first_iformat;
441
extern AVOutputFormat *first_oformat;
442

    
443
enum 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 */
453
void av_register_input_format(AVInputFormat *format);
454
void av_register_output_format(AVOutputFormat *format);
455
AVOutputFormat *guess_stream_format(const char *short_name,
456
                                    const char *filename, const char *mime_type);
457
AVOutputFormat *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
 */
463
enum 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
 */
475
void 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
 */
489
void 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
 */
498
void 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
 */
510
void av_pkt_dump_log(void *avcl, int level, AVPacket *pkt, int dump_payload);
511

    
512
void av_register_all(void);
513

    
514
/** codec tag <-> codec id */
515
enum CodecID av_codec_get_id(const struct AVCodecTag **tags, unsigned int tag);
516
unsigned 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
 */
523
AVInputFormat *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
 */
531
AVInputFormat *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
 */
537
int 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
 */
552
int 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: */
557
AVFormatContext *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
 */
571
int 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
 */
583
int 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
 */
604
int 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
 */
617
int 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
 */
623
int 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
 */
630
int av_read_pause(AVFormatContext *s);
631

    
632
/**
633
 * Close a media file (but not its codecs).
634
 *
635
 * @param s media file handle
636
 */
637
void 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
 */
649
AVStream *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
 */
660
void 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

    
667
int 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
 */
677
int 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
 */
684
int 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
 */
693
int 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
 */
703
void 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
 */
711
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 ));
712

    
713
/** media file output */
714
int 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
 */
723
int 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
 */
736
int 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
 */
752
int 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
 */
768
int 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
 */
777
int av_write_trailer(AVFormatContext *s);
778

    
779
void 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
 */
788
attribute_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
 */
794
attribute_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
 */
811
int64_t parse_date(const char *datestr, int duration);
812

    
813
int64_t av_gettime(void);
814

    
815
/* ffm specific for ffserver */
816
#define FFM_PACKET_SIZE 4096
817
offset_t ffm_read_write_index(int fd);
818
void ffm_write_write_index(int fd, offset_t pos);
819
void 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
 */
827
int 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
 */
841
int 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
 */
850
int 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
 */
866
int 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

    
872
void __dynarray_add(unsigned long **tab_ptr, int *nb_ptr, unsigned long elem);
873

    
874
#ifdef __GNUC__
875
#define dynarray_add(tab, nb_ptr, elem)\
876
do {\
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)\
884
do {\
885
    __dynarray_add((unsigned long **)(tab), nb_ptr, (unsigned long)(elem));\
886
} while(0)
887
#endif
888

    
889
time_t mktimegm(struct tm *tm);
890
struct tm *brktimegm(time_t secs, struct tm *tm);
891
const char *small_strptime(const char *p, const char *fmt,
892
                           struct tm *dt);
893

    
894
struct in_addr;
895
int resolve_host(struct in_addr *sin_addr, const char *hostname);
896

    
897
void 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

    
904
int match_ext(const char *filename, const char *extensions);
905

    
906
#endif /* HAVE_AV_CONFIG_H */
907

    
908
#endif /* AVFORMAT_H */
909