Statistics
| Branch: | Revision:

ffmpeg / libavformat / avformat.h @ 7c8202cc

History | View | Annotate | Download (36.5 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 FFMPEG_AVFORMAT_H
22
#define FFMPEG_AVFORMAT_H
23

    
24
#define LIBAVFORMAT_VERSION_MAJOR 52
25
#define LIBAVFORMAT_VERSION_MINOR 14
26
#define LIBAVFORMAT_VERSION_MICRO  0
27

    
28
#define LIBAVFORMAT_VERSION_INT AV_VERSION_INT(LIBAVFORMAT_VERSION_MAJOR, \
29
                                               LIBAVFORMAT_VERSION_MINOR, \
30
                                               LIBAVFORMAT_VERSION_MICRO)
31
#define LIBAVFORMAT_VERSION     AV_VERSION(LIBAVFORMAT_VERSION_MAJOR,   \
32
                                           LIBAVFORMAT_VERSION_MINOR,   \
33
                                           LIBAVFORMAT_VERSION_MICRO)
34
#define LIBAVFORMAT_BUILD       LIBAVFORMAT_VERSION_INT
35

    
36
#define LIBAVFORMAT_IDENT       "Lavf" AV_STRINGIFY(LIBAVFORMAT_VERSION)
37

    
38
#include <time.h>
39
#include <stdio.h>  /* FILE */
40
#include "libavcodec/avcodec.h"
41

    
42
#include "avio.h"
43

    
44
/* packet functions */
45

    
46
typedef struct AVPacket {
47
    int64_t pts;                            ///< presentation time stamp in time_base units
48
    int64_t dts;                            ///< decompression time stamp in time_base units
49
    uint8_t *data;
50
    int   size;
51
    int   stream_index;
52
    int   flags;
53
    int   duration;                         ///< presentation duration in time_base units (0 if not available)
54
    void  (*destruct)(struct AVPacket *);
55
    void  *priv;
56
    int64_t pos;                            ///< byte position in stream, -1 if unknown
57
} AVPacket;
58
#define PKT_FLAG_KEY   0x0001
59

    
60
void av_destruct_packet_nofree(AVPacket *pkt);
61

    
62
/**
63
 * Default packet destructor.
64
 */
65
void av_destruct_packet(AVPacket *pkt);
66

    
67
/**
68
 * Initialize optional fields of a packet to default values.
69
 *
70
 * @param pkt packet
71
 */
72
void av_init_packet(AVPacket *pkt);
73

    
74
/**
75
 * Allocate the payload of a packet and initialize its fields to default values.
76
 *
77
 * @param pkt packet
78
 * @param size wanted payload size
79
 * @return 0 if OK. AVERROR_xxx otherwise.
80
 */
81
int av_new_packet(AVPacket *pkt, int size);
82

    
83
/**
84
 * Allocate and read the payload of a packet and initialize its fields to default values.
85
 *
86
 * @param pkt packet
87
 * @param size wanted payload size
88
 * @return >0 (read size) if OK. AVERROR_xxx otherwise.
89
 */
90
int av_get_packet(ByteIOContext *s, AVPacket *pkt, int size);
91

    
92
/**
93
 * @warning This is a hack - the packet memory allocation stuff is broken. The
94
 * packet is allocated if it was not really allocated
95
 */
96
int av_dup_packet(AVPacket *pkt);
97

    
98
/**
99
 * Free a packet
100
 *
101
 * @param pkt packet to free
102
 */
103
static inline void av_free_packet(AVPacket *pkt)
104
{
105
    if (pkt && pkt->destruct) {
106
        pkt->destruct(pkt);
107
    }
108
}
109

    
110
/*************************************************/
111
/* fractional numbers for exact pts handling */
112

    
113
/**
114
 * the exact value of the fractional number is: 'val + num / den'.
115
 * num is assumed to be such as 0 <= num < den
116
 * @deprecated Use AVRational instead
117
*/
118
typedef struct AVFrac {
119
    int64_t val, num, den;
120
} AVFrac attribute_deprecated;
121

    
122
/*************************************************/
123
/* input/output formats */
124

    
125
struct AVCodecTag;
126

    
127
struct AVFormatContext;
128

    
129
/** this structure contains the data a format has to probe a file */
130
typedef struct AVProbeData {
131
    const char *filename;
132
    unsigned char *buf;
133
    int buf_size;
134
} AVProbeData;
135

    
136
#define AVPROBE_SCORE_MAX 100               ///< max score, half of that is used for file extension based detection
137
#define AVPROBE_PADDING_SIZE 32             ///< extra allocated bytes at the end of the probe buffer
138

    
139
typedef struct AVFormatParameters {
140
    AVRational time_base;
141
    int sample_rate;
142
    int channels;
143
    int width;
144
    int height;
145
    enum PixelFormat pix_fmt;
146
    int channel; /**< used to select dv channel */
147
    const char *standard; /**< tv standard, NTSC, PAL, SECAM */
148
    int mpeg2ts_raw:1;  /**< force raw MPEG2 transport stream output, if possible */
149
    int mpeg2ts_compute_pcr:1; /**< compute exact PCR for each transport
150
                                  stream packet (only meaningful if
151
                                  mpeg2ts_raw is TRUE) */
152
    int initial_pause:1;       /**< do not begin to play the stream
153
                                  immediately (RTSP only) */
154
    int prealloced_context:1;
155
#if LIBAVFORMAT_VERSION_INT < (53<<16)
156
    enum CodecID video_codec_id;
157
    enum CodecID audio_codec_id;
158
#endif
159
} AVFormatParameters;
160

    
161
//! demuxer will use url_fopen, no opened file should be provided by the caller
162
#define AVFMT_NOFILE        0x0001
163
#define AVFMT_NEEDNUMBER    0x0002 /**< needs '%d' in filename */
164
#define AVFMT_SHOW_IDS      0x0008 /**< show format stream IDs numbers */
165
#define AVFMT_RAWPICTURE    0x0020 /**< format wants AVPicture structure for
166
                                      raw picture data */
167
#define AVFMT_GLOBALHEADER  0x0040 /**< format wants global header */
168
#define AVFMT_NOTIMESTAMPS  0x0080 /**< format does not need / have any timestamps */
169
#define AVFMT_GENERIC_INDEX 0x0100 /**< use generic index building code */
170

    
171
typedef struct AVOutputFormat {
172
    const char *name;
173
    const char *long_name;
174
    const char *mime_type;
175
    const char *extensions; /**< comma separated filename extensions */
176
    /** size of private data so that it can be allocated in the wrapper */
177
    int priv_data_size;
178
    /* output support */
179
    enum CodecID audio_codec; /**< default audio codec */
180
    enum CodecID video_codec; /**< default video codec */
181
    int (*write_header)(struct AVFormatContext *);
182
    int (*write_packet)(struct AVFormatContext *, AVPacket *pkt);
183
    int (*write_trailer)(struct AVFormatContext *);
184
    /** can use flags: AVFMT_NOFILE, AVFMT_NEEDNUMBER, AVFMT_GLOBALHEADER */
185
    int flags;
186
    /** currently only used to set pixel format if not YUV420P */
187
    int (*set_parameters)(struct AVFormatContext *, AVFormatParameters *);
188
    int (*interleave_packet)(struct AVFormatContext *, AVPacket *out, AVPacket *in, int flush);
189

    
190
    /**
191
     * list of supported codec_id-codec_tag pairs, ordered by "better choice first"
192
     * the arrays are all CODEC_ID_NONE terminated
193
     */
194
    const struct AVCodecTag **codec_tag;
195

    
196
    enum CodecID subtitle_codec; /**< default subtitle codec */
197

    
198
    /* private fields */
199
    struct AVOutputFormat *next;
200
} AVOutputFormat;
201

    
202
typedef struct AVInputFormat {
203
    const char *name;
204
    const char *long_name;
205
    /** size of private data so that it can be allocated in the wrapper */
206
    int priv_data_size;
207
    /**
208
     * Tell if a given file has a chance of being parsed by this format.
209
     * The buffer provided is guaranteed to be AVPROBE_PADDING_SIZE bytes
210
     * big so you do not have to check for that unless you need more.
211
     */
212
    int (*read_probe)(AVProbeData *);
213
    /** read the format header and initialize the AVFormatContext
214
       structure. Return 0 if OK. 'ap' if non NULL contains
215
       additional paramters. Only used in raw format right
216
       now. 'av_new_stream' should be called to create new streams.  */
217
    int (*read_header)(struct AVFormatContext *,
218
                       AVFormatParameters *ap);
219
    /** read one packet and put it in 'pkt'. pts and flags are also
220
       set. 'av_new_stream' can be called only if the flag
221
       AVFMTCTX_NOHEADER is used. */
222
    int (*read_packet)(struct AVFormatContext *, AVPacket *pkt);
223
    /** close the stream. The AVFormatContext and AVStreams are not
224
       freed by this function */
225
    int (*read_close)(struct AVFormatContext *);
226
    /**
227
     * seek to a given timestamp relative to the frames in
228
     * stream component stream_index
229
     * @param stream_index must not be -1
230
     * @param flags selects which direction should be preferred if no exact
231
     *              match is available
232
     * @return >= 0 on success (but not necessarily the new offset)
233
     */
234
    int (*read_seek)(struct AVFormatContext *,
235
                     int stream_index, int64_t timestamp, int flags);
236
    /**
237
     * gets the next timestamp in stream[stream_index].time_base units.
238
     * @return the timestamp or AV_NOPTS_VALUE if an error occurred
239
     */
240
    int64_t (*read_timestamp)(struct AVFormatContext *s, int stream_index,
241
                              int64_t *pos, int64_t pos_limit);
242
    /** can use flags: AVFMT_NOFILE, AVFMT_NEEDNUMBER */
243
    int flags;
244
    /** if extensions are defined, then no probe is done. You should
245
       usually not use extension format guessing because it is not
246
       reliable enough */
247
    const char *extensions;
248
    /** general purpose read only value that the format can use */
249
    int value;
250

    
251
    /** start/resume playing - only meaningful if using a network based format
252
       (RTSP) */
253
    int (*read_play)(struct AVFormatContext *);
254

    
255
    /** pause playing - only meaningful if using a network based format
256
       (RTSP) */
257
    int (*read_pause)(struct AVFormatContext *);
258

    
259
    const struct AVCodecTag **codec_tag;
260

    
261
    /* private fields */
262
    struct AVInputFormat *next;
263
} AVInputFormat;
264

    
265
enum AVStreamParseType {
266
    AVSTREAM_PARSE_NONE,
267
    AVSTREAM_PARSE_FULL,       /**< full parsing and repack */
268
    AVSTREAM_PARSE_HEADERS,    /**< only parse headers, don't repack */
269
    AVSTREAM_PARSE_TIMESTAMPS, /**< full parsing and interpolation of timestamps for frames not starting on packet boundary */
270
};
271

    
272
typedef struct AVIndexEntry {
273
    int64_t pos;
274
    int64_t timestamp;
275
#define AVINDEX_KEYFRAME 0x0001
276
    int flags:2;
277
    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).
278
    int min_distance;         /**< min distance between this and the previous keyframe, used to avoid unneeded searching */
279
} AVIndexEntry;
280

    
281
#define AV_DISPOSITION_DEFAULT   0x0001
282
#define AV_DISPOSITION_DUB       0x0002
283
#define AV_DISPOSITION_ORIGINAL  0x0004
284
#define AV_DISPOSITION_COMMENT   0x0008
285
#define AV_DISPOSITION_LYRICS    0x0010
286
#define AV_DISPOSITION_KARAOKE   0x0020
287

    
288
/**
289
 * Stream structure.
290
 * New fields can be added to the end with minor version bumps.
291
 * Removal, reordering and changes to existing fields require a major
292
 * version bump.
293
 * sizeof(AVStream) must not be used outside libav*.
294
 */
295
typedef struct AVStream {
296
    int index;    /**< stream index in AVFormatContext */
297
    int id;       /**< format specific stream id */
298
    AVCodecContext *codec; /**< codec context */
299
    /**
300
     * Real base frame rate of the stream.
301
     * This is the lowest frame rate with which all timestamps can be
302
     * represented accurately (it is the least common multiple of all
303
     * frame rates in the stream), Note, this value is just a guess!
304
     * For example if the timebase is 1/90000 and all frames have either
305
     * approximately 3600 or 1800 timer ticks then r_frame_rate will be 50/1.
306
     */
307
    AVRational r_frame_rate;
308
    void *priv_data;
309

    
310
    /* internal data used in av_find_stream_info() */
311
    int64_t first_dts;
312
    /** encoding: PTS generation when outputing stream */
313
    struct AVFrac pts;
314

    
315
    /**
316
     * This is the fundamental unit of time (in seconds) in terms
317
     * of which frame timestamps are represented. For fixed-fps content,
318
     * timebase should be 1/frame rate and timestamp increments should be
319
     * identically 1.
320
     */
321
    AVRational time_base;
322
    int pts_wrap_bits; /**< number of bits in pts (used for wrapping control) */
323
    /* ffmpeg.c private use */
324
    int stream_copy; /**< if set, just copy stream */
325
    enum AVDiscard discard; ///< selects which packets can be discarded at will and do not need to be demuxed
326
    //FIXME move stuff to a flags field?
327
    /** quality, as it has been removed from AVCodecContext and put in AVVideoFrame
328
     * MN: dunno if that is the right place for it */
329
    float quality;
330
    /**
331
     * Decoding: pts of the first frame of the stream, in stream time base.
332
     * Only set this if you are absolutely 100% sure that the value you set
333
     * it to really is the pts of the first frame.
334
     * This may be undefined (AV_NOPTS_VALUE).
335
     * @note The ASF header does NOT contain a correct start_time the ASF
336
     * demuxer must NOT set this.
337
     */
338
    int64_t start_time;
339
    /**
340
     * Decoding: duration of the stream, in stream time base.
341
     * If a source file does not specify a duration, but does specify
342
     * a bitrate, this value will be estimates from bit rate and file size.
343
     */
344
    int64_t duration;
345

    
346
    char language[4]; /** ISO 639 3-letter language code (empty string if undefined) */
347

    
348
    /* av_read_frame() support */
349
    enum AVStreamParseType need_parsing;
350
    struct AVCodecParserContext *parser;
351

    
352
    int64_t cur_dts;
353
    int last_IP_duration;
354
    int64_t last_IP_pts;
355
    /* av_seek_frame() support */
356
    AVIndexEntry *index_entries; /**< only used if the format does not
357
                                    support seeking natively */
358
    int nb_index_entries;
359
    unsigned int index_entries_allocated_size;
360

    
361
    int64_t nb_frames;                 ///< number of frames in this stream if known or 0
362

    
363
#define MAX_REORDER_DELAY 4
364
    int64_t pts_buffer[MAX_REORDER_DELAY+1];
365

    
366
    char *filename; /**< source filename of the stream */
367

    
368
    int disposition; /**< AV_DISPOSITION_* bitfield */
369
} AVStream;
370

    
371
#define AV_PROGRAM_RUNNING 1
372

    
373
/**
374
 * New fields can be added to the end with minor version bumps.
375
 * Removal, reordering and changes to existing fields require a major
376
 * version bump.
377
 * sizeof(AVProgram) must not be used outside libav*.
378
 */
379
typedef struct AVProgram {
380
    int            id;
381
    char           *provider_name; ///< Network name for DVB streams
382
    char           *name;          ///< Service name for DVB streams
383
    int            flags;
384
    enum AVDiscard discard;        ///< selects which program to discard and which to feed to the caller
385
    unsigned int   *stream_index;
386
    unsigned int   nb_stream_indexes;
387
} AVProgram;
388

    
389
#define AVFMTCTX_NOHEADER      0x0001 /**< signal that no header is present
390
                                         (streams are added dynamically) */
391

    
392
typedef struct AVChapter {
393
    int id;                 ///< Unique id to identify the chapter
394
    AVRational time_base;   ///< Timebase in which the start/end timestamps are specified
395
    int64_t start, end;     ///< chapter start/end time in time_base units
396
    char *title;            ///< chapter title
397
} AVChapter;
398

    
399
#define MAX_STREAMS 20
400

    
401
/**
402
 * format I/O context.
403
 * New fields can be added to the end with minor version bumps.
404
 * Removal, reordering and changes to existing fields require a major
405
 * version bump.
406
 * sizeof(AVFormatContext) must not be used outside libav*.
407
 */
408
typedef struct AVFormatContext {
409
    const AVClass *av_class; /**< set by av_alloc_format_context */
410
    /* can only be iformat or oformat, not both at the same time */
411
    struct AVInputFormat *iformat;
412
    struct AVOutputFormat *oformat;
413
    void *priv_data;
414
    ByteIOContext *pb;
415
    unsigned int nb_streams;
416
    AVStream *streams[MAX_STREAMS];
417
    char filename[1024]; /**< input or output filename */
418
    /* stream info */
419
    int64_t timestamp;
420
    char title[512];
421
    char author[512];
422
    char copyright[512];
423
    char comment[512];
424
    char album[512];
425
    int year;  /**< ID3 year, 0 if none */
426
    int track; /**< track number, 0 if none */
427
    char genre[32]; /**< ID3 genre */
428

    
429
    int ctx_flags; /**< format specific flags, see AVFMTCTX_xx */
430
    /* private data for pts handling (do not modify directly) */
431
    /** This buffer is only needed when packets were already buffered but
432
       not decoded, for example to get the codec parameters in mpeg
433
       streams */
434
    struct AVPacketList *packet_buffer;
435

    
436
    /** decoding: position of the first frame of the component, in
437
       AV_TIME_BASE fractional seconds. NEVER set this value directly:
438
       it is deduced from the AVStream values.  */
439
    int64_t start_time;
440
    /** decoding: duration of the stream, in AV_TIME_BASE fractional
441
       seconds. NEVER set this value directly: it is deduced from the
442
       AVStream values.  */
443
    int64_t duration;
444
    /** decoding: total file size. 0 if unknown */
445
    int64_t file_size;
446
    /** decoding: total stream bitrate in bit/s, 0 if not
447
       available. Never set it directly if the file_size and the
448
       duration are known as ffmpeg can compute it automatically. */
449
    int bit_rate;
450

    
451
    /* av_read_frame() support */
452
    AVStream *cur_st;
453
    const uint8_t *cur_ptr;
454
    int cur_len;
455
    AVPacket cur_pkt;
456

    
457
    /* av_seek_frame() support */
458
    int64_t data_offset; /** offset of the first packet */
459
    int index_built;
460

    
461
    int mux_rate;
462
    int packet_size;
463
    int preload;
464
    int max_delay;
465

    
466
#define AVFMT_NOOUTPUTLOOP -1
467
#define AVFMT_INFINITEOUTPUTLOOP 0
468
    /** number of times to loop output in formats that support it */
469
    int loop_output;
470

    
471
    int flags;
472
#define AVFMT_FLAG_GENPTS       0x0001 ///< generate pts if missing even if it requires parsing future frames
473
#define AVFMT_FLAG_IGNIDX       0x0002 ///< ignore index
474
#define AVFMT_FLAG_NONBLOCK     0x0004 ///< do not block when reading packets from input
475

    
476
    int loop_input;
477
    /** decoding: size of data to probe; encoding unused */
478
    unsigned int probesize;
479

    
480
    /**
481
     * maximum duration in AV_TIME_BASE units over which the input should be analyzed in av_find_stream_info()
482
     */
483
    int max_analyze_duration;
484

    
485
    const uint8_t *key;
486
    int keylen;
487

    
488
    unsigned int nb_programs;
489
    AVProgram **programs;
490

    
491
    /**
492
     * Forced video codec_id.
493
     * demuxing: set by user
494
     */
495
    enum CodecID video_codec_id;
496
    /**
497
     * Forced audio codec_id.
498
     * demuxing: set by user
499
     */
500
    enum CodecID audio_codec_id;
501
    /**
502
     * Forced subtitle codec_id.
503
     * demuxing: set by user
504
     */
505
    enum CodecID subtitle_codec_id;
506

    
507
    /**
508
     * Maximum amount of memory in bytes to use per stream for the index.
509
     * If the needed index exceeds this size entries will be discarded as
510
     * needed to maintain a smaller size. This can lead to slower or less
511
     * accurate seeking (depends on demuxer).
512
     * Demuxers for which a full in memory index is mandatory will ignore
513
     * this.
514
     * muxing  : unused
515
     * demuxing: set by user
516
     */
517
    unsigned int max_index_size;
518

    
519
    /**
520
     * Maximum amount of memory in bytes to use for buffering frames
521
     * obtained from real-time capture devices.
522
     */
523
    unsigned int max_picture_buffer;
524

    
525
    int nb_chapters;
526
    AVChapter **chapters;
527
} AVFormatContext;
528

    
529
typedef struct AVPacketList {
530
    AVPacket pkt;
531
    struct AVPacketList *next;
532
} AVPacketList;
533

    
534
#if LIBAVFORMAT_VERSION_INT < (53<<16)
535
extern AVInputFormat *first_iformat;
536
extern AVOutputFormat *first_oformat;
537
#endif
538

    
539
AVInputFormat  *av_iformat_next(AVInputFormat  *f);
540
AVOutputFormat *av_oformat_next(AVOutputFormat *f);
541

    
542
enum CodecID av_guess_image2_codec(const char *filename);
543

    
544
/* XXX: use automatic init with either ELF sections or C file parser */
545
/* modules */
546

    
547
/* utils.c */
548
void av_register_input_format(AVInputFormat *format);
549
void av_register_output_format(AVOutputFormat *format);
550
AVOutputFormat *guess_stream_format(const char *short_name,
551
                                    const char *filename, const char *mime_type);
552
AVOutputFormat *guess_format(const char *short_name,
553
                             const char *filename, const char *mime_type);
554

    
555
/**
556
 * Guesses the codec id based upon muxer and filename.
557
 */
558
enum CodecID av_guess_codec(AVOutputFormat *fmt, const char *short_name,
559
                            const char *filename, const char *mime_type, enum CodecType type);
560

    
561
/**
562
 * Send a nice hexadecimal dump of a buffer to the specified file stream.
563
 *
564
 * @param f The file stream pointer where the dump should be sent to.
565
 * @param buf buffer
566
 * @param size buffer size
567
 *
568
 * @see av_hex_dump_log, av_pkt_dump, av_pkt_dump_log
569
 */
570
void av_hex_dump(FILE *f, uint8_t *buf, int size);
571

    
572
/**
573
 * Send a nice hexadecimal dump of a buffer to the log.
574
 *
575
 * @param avcl A pointer to an arbitrary struct of which the first field is a
576
 * pointer to an AVClass struct.
577
 * @param level The importance level of the message, lower values signifying
578
 * higher importance.
579
 * @param buf buffer
580
 * @param size buffer size
581
 *
582
 * @see av_hex_dump, av_pkt_dump, av_pkt_dump_log
583
 */
584
void av_hex_dump_log(void *avcl, int level, uint8_t *buf, int size);
585

    
586
/**
587
 * Send a nice dump of a packet to the specified file stream.
588
 *
589
 * @param f The file stream pointer where the dump should be sent to.
590
 * @param pkt packet to dump
591
 * @param dump_payload true if the payload must be displayed too
592
 */
593
void av_pkt_dump(FILE *f, AVPacket *pkt, int dump_payload);
594

    
595
/**
596
 * Send a nice dump of a packet to the log.
597
 *
598
 * @param avcl A pointer to an arbitrary struct of which the first field is a
599
 * pointer to an AVClass struct.
600
 * @param level The importance level of the message, lower values signifying
601
 * higher importance.
602
 * @param pkt packet to dump
603
 * @param dump_payload true if the payload must be displayed too
604
 */
605
void av_pkt_dump_log(void *avcl, int level, AVPacket *pkt, int dump_payload);
606

    
607
void av_register_all(void);
608

    
609
/** codec tag <-> codec id */
610
enum CodecID av_codec_get_id(const struct AVCodecTag **tags, unsigned int tag);
611
unsigned int av_codec_get_tag(const struct AVCodecTag **tags, enum CodecID id);
612

    
613
/* media file input */
614

    
615
/**
616
 * finds AVInputFormat based on input format's short name.
617
 */
618
AVInputFormat *av_find_input_format(const char *short_name);
619

    
620
/**
621
 * Guess file format.
622
 *
623
 * @param is_opened whether the file is already opened, determines whether
624
 *                  demuxers with or without AVFMT_NOFILE are probed
625
 */
626
AVInputFormat *av_probe_input_format(AVProbeData *pd, int is_opened);
627

    
628
/**
629
 * Allocates all the structures needed to read an input stream.
630
 *        This does not open the needed codecs for decoding the stream[s].
631
 */
632
int av_open_input_stream(AVFormatContext **ic_ptr,
633
                         ByteIOContext *pb, const char *filename,
634
                         AVInputFormat *fmt, AVFormatParameters *ap);
635

    
636
/**
637
 * Open a media file as input. The codecs are not opened. Only the file
638
 * header (if present) is read.
639
 *
640
 * @param ic_ptr the opened media file handle is put here
641
 * @param filename filename to open.
642
 * @param fmt if non NULL, force the file format to use
643
 * @param buf_size optional buffer size (zero if default is OK)
644
 * @param ap additional parameters needed when opening the file (NULL if default)
645
 * @return 0 if OK. AVERROR_xxx otherwise.
646
 */
647
int av_open_input_file(AVFormatContext **ic_ptr, const char *filename,
648
                       AVInputFormat *fmt,
649
                       int buf_size,
650
                       AVFormatParameters *ap);
651
/**
652
 * Allocate an AVFormatContext.
653
 * Can be freed with av_free() but do not forget to free everything you
654
 * explicitly allocated as well!
655
 */
656
AVFormatContext *av_alloc_format_context(void);
657

    
658
/**
659
 * Read packets of a media file to get stream information. This
660
 * is useful for file formats with no headers such as MPEG. This
661
 * function also computes the real frame rate in case of mpeg2 repeat
662
 * frame mode.
663
 * The logical file position is not changed by this function;
664
 * examined packets may be buffered for later processing.
665
 *
666
 * @param ic media file handle
667
 * @return >=0 if OK. AVERROR_xxx if error.
668
 * @todo Let user decide somehow what information is needed so we do not waste time getting stuff the user does not need.
669
 */
670
int av_find_stream_info(AVFormatContext *ic);
671

    
672
/**
673
 * Read a transport packet from a media file.
674
 *
675
 * This function is obsolete and should never be used.
676
 * Use av_read_frame() instead.
677
 *
678
 * @param s media file handle
679
 * @param pkt is filled
680
 * @return 0 if OK. AVERROR_xxx if error.
681
 */
682
int av_read_packet(AVFormatContext *s, AVPacket *pkt);
683

    
684
/**
685
 * Return the next frame of a stream.
686
 *
687
 * The returned packet is valid
688
 * until the next av_read_frame() or until av_close_input_file() and
689
 * must be freed with av_free_packet. For video, the packet contains
690
 * exactly one frame. For audio, it contains an integer number of
691
 * frames if each frame has a known fixed size (e.g. PCM or ADPCM
692
 * data). If the audio frames have a variable size (e.g. MPEG audio),
693
 * then it contains one frame.
694
 *
695
 * pkt->pts, pkt->dts and pkt->duration are always set to correct
696
 * values in AVStream.timebase units (and guessed if the format cannot
697
 * provided them). pkt->pts can be AV_NOPTS_VALUE if the video format
698
 * has B frames, so it is better to rely on pkt->dts if you do not
699
 * decompress the payload.
700
 *
701
 * @return 0 if OK, < 0 if error or end of file.
702
 */
703
int av_read_frame(AVFormatContext *s, AVPacket *pkt);
704

    
705
/**
706
 * Seek to the key frame at timestamp.
707
 * 'timestamp' in 'stream_index'.
708
 * @param stream_index If stream_index is (-1), a default
709
 * stream is selected, and timestamp is automatically converted
710
 * from AV_TIME_BASE units to the stream specific time_base.
711
 * @param timestamp timestamp in AVStream.time_base units
712
 *        or if there is no stream specified then in AV_TIME_BASE units
713
 * @param flags flags which select direction and seeking mode
714
 * @return >= 0 on success
715
 */
716
int av_seek_frame(AVFormatContext *s, int stream_index, int64_t timestamp, int flags);
717

    
718
/**
719
 * start playing a network based stream (e.g. RTSP stream) at the
720
 * current position
721
 */
722
int av_read_play(AVFormatContext *s);
723

    
724
/**
725
 * Pause a network based stream (e.g. RTSP stream).
726
 *
727
 * Use av_read_play() to resume it.
728
 */
729
int av_read_pause(AVFormatContext *s);
730

    
731
/**
732
 * Free a AVFormatContext allocated by av_open_input_stream.
733
 * @param s context to free
734
 */
735
void av_close_input_stream(AVFormatContext *s);
736

    
737
/**
738
 * Close a media file (but not its codecs).
739
 *
740
 * @param s media file handle
741
 */
742
void av_close_input_file(AVFormatContext *s);
743

    
744
/**
745
 * Add a new stream to a media file.
746
 *
747
 * Can only be called in the read_header() function. If the flag
748
 * AVFMTCTX_NOHEADER is in the format context, then new streams
749
 * can be added in read_packet too.
750
 *
751
 * @param s media file handle
752
 * @param id file format dependent stream id
753
 */
754
AVStream *av_new_stream(AVFormatContext *s, int id);
755
AVProgram *av_new_program(AVFormatContext *s, int id);
756

    
757
/**
758
 * Add a new chapter.
759
 * This function is NOT part of the public API
760
 * and should be ONLY used by demuxers.
761
 *
762
 * @param s media file handle
763
 * @param id unique id for this chapter
764
 * @param start chapter start time in AV_TIME_BASE units
765
 * @param end chapter end time in AV_TIME_BASE units
766
 * @param title chapter title
767
 */
768
int ff_new_chapter(AVFormatContext *s, int id, int64_t start, int64_t end, const char *title);
769

    
770
/**
771
 * Set the pts for a given stream.
772
 *
773
 * @param s stream
774
 * @param pts_wrap_bits number of bits effectively used by the pts
775
 *        (used for wrap control, 33 is the value for MPEG)
776
 * @param pts_num numerator to convert to seconds (MPEG: 1)
777
 * @param pts_den denominator to convert to seconds (MPEG: 90000)
778
 */
779
void av_set_pts_info(AVStream *s, int pts_wrap_bits,
780
                     int pts_num, int pts_den);
781

    
782
#define AVSEEK_FLAG_BACKWARD 1 ///< seek backward
783
#define AVSEEK_FLAG_BYTE     2 ///< seeking based on position in bytes
784
#define AVSEEK_FLAG_ANY      4 ///< seek to any frame, even non keyframes
785

    
786
int av_find_default_stream_index(AVFormatContext *s);
787

    
788
/**
789
 * Gets the index for a specific timestamp.
790
 * @param flags if AVSEEK_FLAG_BACKWARD then the returned index will correspond to
791
 *                 the timestamp which is <= the requested one, if backward is 0
792
 *                 then it will be >=
793
 *              if AVSEEK_FLAG_ANY seek to any frame, only keyframes otherwise
794
 * @return < 0 if no such timestamp could be found
795
 */
796
int av_index_search_timestamp(AVStream *st, int64_t timestamp, int flags);
797

    
798
/**
799
 * Ensures the index uses less memory than the maximum specified in
800
 * AVFormatContext.max_index_size, by discarding entries if it grows
801
 * too large.
802
 * This function is not part of the public API and should only be called
803
 * by demuxers.
804
 */
805
void ff_reduce_index(AVFormatContext *s, int stream_index);
806

    
807
/**
808
 * Add a index entry into a sorted list updateing if it is already there.
809
 *
810
 * @param timestamp timestamp in the timebase of the given stream
811
 */
812
int av_add_index_entry(AVStream *st,
813
                       int64_t pos, int64_t timestamp, int size, int distance, int flags);
814

    
815
/**
816
 * Does a binary search using av_index_search_timestamp() and AVCodec.read_timestamp().
817
 * This is not supposed to be called directly by a user application, but by demuxers.
818
 * @param target_ts target timestamp in the time base of the given stream
819
 * @param stream_index stream number
820
 */
821
int av_seek_frame_binary(AVFormatContext *s, int stream_index, int64_t target_ts, int flags);
822

    
823
/**
824
 * Updates cur_dts of all streams based on given timestamp and AVStream.
825
 *
826
 * Stream ref_st unchanged, others set cur_dts in their native timebase
827
 * only needed for timestamp wrapping or if (dts not set and pts!=dts).
828
 * @param timestamp new dts expressed in time_base of param ref_st
829
 * @param ref_st reference stream giving time_base of param timestamp
830
 */
831
void av_update_cur_dts(AVFormatContext *s, AVStream *ref_st, int64_t timestamp);
832

    
833
/**
834
 * Does a binary search using read_timestamp().
835
 * This is not supposed to be called directly by a user application, but by demuxers.
836
 * @param target_ts target timestamp in the time base of the given stream
837
 * @param stream_index stream number
838
 */
839
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 ));
840

    
841
/** media file output */
842
int av_set_parameters(AVFormatContext *s, AVFormatParameters *ap);
843

    
844
/**
845
 * Allocate the stream private data and write the stream header to an
846
 * output media file.
847
 *
848
 * @param s media file handle
849
 * @return 0 if OK. AVERROR_xxx if error.
850
 */
851
int av_write_header(AVFormatContext *s);
852

    
853
/**
854
 * Write a packet to an output media file.
855
 *
856
 * The packet shall contain one audio or video frame.
857
 * The packet must be correctly interleaved according to the container specification,
858
 * if not then av_interleaved_write_frame must be used
859
 *
860
 * @param s media file handle
861
 * @param pkt the packet, which contains the stream_index, buf/buf_size, dts/pts, ...
862
 * @return < 0 if error, = 0 if OK, 1 if end of stream wanted.
863
 */
864
int av_write_frame(AVFormatContext *s, AVPacket *pkt);
865

    
866
/**
867
 * Writes a packet to an output media file ensuring correct interleaving.
868
 *
869
 * The packet must contain one audio or video frame.
870
 * If the packets are already correctly interleaved the application should
871
 * call av_write_frame() instead as it is slightly faster. It is also important
872
 * to keep in mind that completely non-interleaved input will need huge amounts
873
 * of memory to interleave with this, so it is preferable to interleave at the
874
 * demuxer level.
875
 *
876
 * @param s media file handle
877
 * @param pkt the packet, which contains the stream_index, buf/buf_size, dts/pts, ...
878
 * @return < 0 if error, = 0 if OK, 1 if end of stream wanted.
879
 */
880
int av_interleaved_write_frame(AVFormatContext *s, AVPacket *pkt);
881

    
882
/**
883
 * Interleave a packet per DTS in an output media file.
884
 *
885
 * Packets with pkt->destruct == av_destruct_packet will be freed inside this function,
886
 * so they cannot be used after it, note calling av_free_packet() on them is still safe.
887
 *
888
 * @param s media file handle
889
 * @param out the interleaved packet will be output here
890
 * @param in the input packet
891
 * @param flush 1 if no further packets are available as input and all
892
 *              remaining packets should be output
893
 * @return 1 if a packet was output, 0 if no packet could be output,
894
 *         < 0 if an error occurred
895
 */
896
int av_interleave_packet_per_dts(AVFormatContext *s, AVPacket *out, AVPacket *pkt, int flush);
897

    
898
/**
899
 * @brief Write the stream trailer to an output media file and
900
 *        free the file private data.
901
 *
902
 * @param s media file handle
903
 * @return 0 if OK. AVERROR_xxx if error.
904
 */
905
int av_write_trailer(AVFormatContext *s);
906

    
907
void dump_format(AVFormatContext *ic,
908
                 int index,
909
                 const char *url,
910
                 int is_output);
911

    
912
/**
913
 * parses width and height out of string str.
914
 * @deprecated Use av_parse_video_frame_size instead.
915
 */
916
attribute_deprecated int parse_image_size(int *width_ptr, int *height_ptr, const char *str);
917

    
918
/**
919
 * Converts frame rate from string to a fraction.
920
 * @deprecated Use av_parse_video_frame_rate instead.
921
 */
922
attribute_deprecated int parse_frame_rate(int *frame_rate, int *frame_rate_base, const char *arg);
923

    
924
/**
925
 * Parses \p datestr and returns a corresponding number of microseconds.
926
 * @param datestr String representing a date or a duration.
927
 * - If a date the syntax is:
928
 * @code
929
 *  [{YYYY-MM-DD|YYYYMMDD}]{T| }{HH[:MM[:SS[.m...]]][Z]|HH[MM[SS[.m...]]][Z]}
930
 * @endcode
931
 * Time is localtime unless Z is appended, in which case it is
932
 * interpreted as UTC.
933
 * If the year-month-day part isn't specified it takes the current
934
 * year-month-day.
935
 * Returns the number of microseconds since 1st of January, 1970 up to
936
 * the time of the parsed date or INT64_MIN if \p datestr cannot be
937
 * successfully parsed.
938
 * - If a duration the syntax is:
939
 * @code
940
 *  [-]HH[:MM[:SS[.m...]]]
941
 *  [-]S+[.m...]
942
 * @endcode
943
 * Returns the number of microseconds contained in a time interval
944
 * with the specified duration or INT64_MIN if \p datestr cannot be
945
 * successfully parsed.
946
 * @param duration Flag which tells how to interpret \p datestr, if
947
 * not zero \p datestr is interpreted as a duration, otherwise as a
948
 * date.
949
 */
950
int64_t parse_date(const char *datestr, int duration);
951

    
952
int64_t av_gettime(void);
953

    
954
/* ffm specific for ffserver */
955
#define FFM_PACKET_SIZE 4096
956
offset_t ffm_read_write_index(int fd);
957
void ffm_write_write_index(int fd, offset_t pos);
958
void ffm_set_write_index(AVFormatContext *s, offset_t pos, offset_t file_size);
959

    
960
/**
961
 * Attempts to find a specific tag in a URL.
962
 *
963
 * syntax: '?tag1=val1&tag2=val2...'. Little URL decoding is done.
964
 * Return 1 if found.
965
 */
966
int find_info_tag(char *arg, int arg_size, const char *tag1, const char *info);
967

    
968
/**
969
 * Returns in 'buf' the path with '%d' replaced by number.
970

971
 * Also handles the '%0nd' format where 'n' is the total number
972
 * of digits and '%%'.
973
 *
974
 * @param buf destination buffer
975
 * @param buf_size destination buffer size
976
 * @param path numbered sequence string
977
 * @param number frame number
978
 * @return 0 if OK, -1 if format error.
979
 */
980
int av_get_frame_filename(char *buf, int buf_size,
981
                          const char *path, int number);
982

    
983
/**
984
 * Check whether filename actually is a numbered sequence generator.
985
 *
986
 * @param filename possible numbered sequence string
987
 * @return 1 if a valid numbered sequence string, 0 otherwise.
988
 */
989
int av_filename_number_test(const char *filename);
990

    
991
/**
992
 * Generate an SDP for an RTP session.
993
 *
994
 * @param ac array of AVFormatContexts describing the RTP streams. If the
995
 *           array is composed by only one context, such context can contain
996
 *           multiple AVStreams (one AVStream per RTP stream). Otherwise,
997
 *           all the contexts in the array (an AVCodecContext per RTP stream)
998
 *           must contain only one AVStream
999
 * @param n_files number of AVCodecContexts contained in ac
1000
 * @param buff buffer where the SDP will be stored (must be allocated by
1001
 *             the caller
1002
 * @param size the size of the buffer
1003
 * @return 0 if OK. AVERROR_xxx if error.
1004
 */
1005
int avf_sdp_create(AVFormatContext *ac[], int n_files, char *buff, int size);
1006

    
1007
#ifdef HAVE_AV_CONFIG_H
1008

    
1009
void ff_dynarray_add(unsigned long **tab_ptr, int *nb_ptr, unsigned long elem);
1010

    
1011
#ifdef __GNUC__
1012
#define dynarray_add(tab, nb_ptr, elem)\
1013
do {\
1014
    typeof(tab) _tab = (tab);\
1015
    typeof(elem) _elem = (elem);\
1016
    (void)sizeof(**_tab == _elem); /* check that types are compatible */\
1017
    ff_dynarray_add((unsigned long **)_tab, nb_ptr, (unsigned long)_elem);\
1018
} while(0)
1019
#else
1020
#define dynarray_add(tab, nb_ptr, elem)\
1021
do {\
1022
    ff_dynarray_add((unsigned long **)(tab), nb_ptr, (unsigned long)(elem));\
1023
} while(0)
1024
#endif
1025

    
1026
time_t mktimegm(struct tm *tm);
1027
struct tm *brktimegm(time_t secs, struct tm *tm);
1028
const char *small_strptime(const char *p, const char *fmt,
1029
                           struct tm *dt);
1030

    
1031
struct in_addr;
1032
int resolve_host(struct in_addr *sin_addr, const char *hostname);
1033

    
1034
void url_split(char *proto, int proto_size,
1035
               char *authorization, int authorization_size,
1036
               char *hostname, int hostname_size,
1037
               int *port_ptr,
1038
               char *path, int path_size,
1039
               const char *url);
1040

    
1041
int match_ext(const char *filename, const char *extensions);
1042

    
1043
#endif /* HAVE_AV_CONFIG_H */
1044

    
1045
#endif /* FFMPEG_AVFORMAT_H */