Statistics
| Branch: | Revision:

ffmpeg / libavformat / avformat.h @ ec264570

History | View | Annotate | Download (45.8 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_AVFORMAT_H
22
#define AVFORMAT_AVFORMAT_H
23

    
24
#define LIBAVFORMAT_VERSION_MAJOR 52
25
#define LIBAVFORMAT_VERSION_MINOR 31
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
/**
39
 * Returns the LIBAVFORMAT_VERSION_INT constant.
40
 */
41
unsigned avformat_version(void);
42

    
43
#include <time.h>
44
#include <stdio.h>  /* FILE */
45
#include "libavcodec/avcodec.h"
46

    
47
#include "avio.h"
48

    
49
struct AVFormatContext;
50

    
51

    
52
/*
53
 * Public Metadata API.
54
 * The metadata API allows libavformat to export metadata tags to a client
55
 * application using a sequence of key/value pairs.
56
 * Important concepts to keep in mind:
57
 * 1. Keys are unique; there can never be 2 tags with the same key. This is
58
 *    also meant semantically, i.e., a demuxer should not knowingly produce
59
 *    several keys that are literally different but semantically identical.
60
 *    E.g., key=Author5, key=Author6. In this example, all authors must be
61
 *    placed in the same tag.
62
 * 2. Metadata is flat, not hierarchical; there are no subtags. If you
63
 *    want to store, e.g., the email address of the child of producer Alice
64
 *    and actor Bob, that could have key=alice_and_bobs_childs_email_address.
65
 * 3. A tag whose value is localized for a particular language is appended
66
 *    with a dash character ('-') and the ISO 639 3-letter language code.
67
 *    For example: Author-ger=Michael, Author-eng=Mike
68
 *    The original/default language is in the unqualified "Author" tag.
69
 *    A demuxer should set a default if it sets any translated tag.
70
 */
71

    
72
#define AV_METADATA_MATCH_CASE      1
73
#define AV_METADATA_IGNORE_SUFFIX   2
74

    
75
typedef struct {
76
    char *key;
77
    char *value;
78
}AVMetadataTag;
79

    
80
typedef struct AVMetadata AVMetadata;
81
typedef struct AVMetadataConv AVMetadataConv;
82

    
83
/**
84
 * Gets a metadata element with matching key.
85
 * @param prev Set to the previous matching element to find the next.
86
 * @param flags Allows case as well as suffix-insensitive comparisons.
87
 * @return Found tag or NULL, changing key or value leads to undefined behavior.
88
 */
89
AVMetadataTag *
90
av_metadata_get(AVMetadata *m, const char *key, const AVMetadataTag *prev, int flags);
91

    
92
/**
93
 * Sets the given tag in m, overwriting an existing tag.
94
 * @param key tag key to add to m (will be av_strduped)
95
 * @param value tag value to add to m (will be av_strduped)
96
 * @return >= 0 on success otherwise an error code <0
97
 */
98
int av_metadata_set(AVMetadata **pm, const char *key, const char *value);
99

    
100
/**
101
 * Convert all the metadata sets from ctx according to the source and
102
 * destination conversion tables.
103
 * @param d_conv destination tags format conversion table
104
 * @param s_conv source tags format conversion table
105
 */
106
void av_metadata_conv(struct AVFormatContext *ctx,const AVMetadataConv *d_conv,
107
                                                  const AVMetadataConv *s_conv);
108

    
109
/**
110
 * Frees all the memory allocated for an AVMetadata struct.
111
 */
112
void av_metadata_free(AVMetadata **m);
113

    
114

    
115
/* packet functions */
116

    
117
typedef struct AVPacket {
118
    /**
119
     * Presentation timestamp in time_base units; the time at which the
120
     * decompressed packet will be presented to the user.
121
     * Can be AV_NOPTS_VALUE if it is not stored in the file.
122
     * pts MUST be larger or equal to dts as presentation cannot happen before
123
     * decompression, unless one wants to view hex dumps. Some formats misuse
124
     * the terms dts and pts/cts to mean something different. Such timestamps
125
     * must be converted to true pts/dts before they are stored in AVPacket.
126
     */
127
    int64_t pts;
128
    /**
129
     * Decompression timestamp in time_base units; the time at which the
130
     * packet is decompressed.
131
     * Can be AV_NOPTS_VALUE if it is not stored in the file.
132
     */
133
    int64_t dts;
134
    uint8_t *data;
135
    int   size;
136
    int   stream_index;
137
    int   flags;
138
    /**
139
     * Duration of this packet in time_base units, 0 if unknown.
140
     * Equals next_pts - this_pts in presentation order.
141
     */
142
    int   duration;
143
    void  (*destruct)(struct AVPacket *);
144
    void  *priv;
145
    int64_t pos;                            ///< byte position in stream, -1 if unknown
146

    
147
    /**
148
     * Time difference in stream time base units from the pts of this
149
     * packet to the point at which the output from the decoder has converged
150
     * independent from the availability of previous frames. That is, the
151
     * frames are virtually identical no matter if decoding started from
152
     * the very first frame or from this keyframe.
153
     * Is AV_NOPTS_VALUE if unknown.
154
     * This field is not the display duration of the current packet.
155
     *
156
     * The purpose of this field is to allow seeking in streams that have no
157
     * keyframes in the conventional sense. It corresponds to the
158
     * recovery point SEI in H.264 and match_time_delta in NUT. It is also
159
     * essential for some types of subtitle streams to ensure that all
160
     * subtitles are correctly displayed after seeking.
161
     */
162
    int64_t convergence_duration;
163
} AVPacket;
164
#define PKT_FLAG_KEY   0x0001
165

    
166
void av_destruct_packet_nofree(AVPacket *pkt);
167

    
168
/**
169
 * Default packet destructor.
170
 */
171
void av_destruct_packet(AVPacket *pkt);
172

    
173
/**
174
 * Initialize optional fields of a packet with default values.
175
 *
176
 * @param pkt packet
177
 */
178
void av_init_packet(AVPacket *pkt);
179

    
180
/**
181
 * Allocate the payload of a packet and initialize its fields with
182
 * default values.
183
 *
184
 * @param pkt packet
185
 * @param size wanted payload size
186
 * @return 0 if OK, AVERROR_xxx otherwise
187
 */
188
int av_new_packet(AVPacket *pkt, int size);
189

    
190
/**
191
 * Allocate and read the payload of a packet and initialize its fields with
192
 * default values.
193
 *
194
 * @param pkt packet
195
 * @param size desired payload size
196
 * @return >0 (read size) if OK, AVERROR_xxx otherwise
197
 */
198
int av_get_packet(ByteIOContext *s, AVPacket *pkt, int size);
199

    
200
/**
201
 * @warning This is a hack - the packet memory allocation stuff is broken. The
202
 * packet is allocated if it was not really allocated.
203
 */
204
int av_dup_packet(AVPacket *pkt);
205

    
206
/**
207
 * Free a packet.
208
 *
209
 * @param pkt packet to free
210
 */
211
static inline void av_free_packet(AVPacket *pkt)
212
{
213
    if (pkt && pkt->destruct) {
214
        pkt->destruct(pkt);
215
    }
216
}
217

    
218
/*************************************************/
219
/* fractional numbers for exact pts handling */
220

    
221
/**
222
 * The exact value of the fractional number is: 'val + num / den'.
223
 * num is assumed to be 0 <= num < den.
224
 */
225
typedef struct AVFrac {
226
    int64_t val, num, den;
227
} AVFrac;
228

    
229
/*************************************************/
230
/* input/output formats */
231

    
232
struct AVCodecTag;
233

    
234
/** This structure contains the data a format has to probe a file. */
235
typedef struct AVProbeData {
236
    const char *filename;
237
    unsigned char *buf;
238
    int buf_size;
239
} AVProbeData;
240

    
241
#define AVPROBE_SCORE_MAX 100               ///< maximum score, half of that is used for file-extension-based detection
242
#define AVPROBE_PADDING_SIZE 32             ///< extra allocated bytes at the end of the probe buffer
243

    
244
typedef struct AVFormatParameters {
245
    AVRational time_base;
246
    int sample_rate;
247
    int channels;
248
    int width;
249
    int height;
250
    enum PixelFormat pix_fmt;
251
    int channel; /**< Used to select DV channel. */
252
    const char *standard; /**< TV standard, NTSC, PAL, SECAM */
253
    unsigned int mpeg2ts_raw:1;  /**< Force raw MPEG-2 transport stream output, if possible. */
254
    unsigned int mpeg2ts_compute_pcr:1; /**< Compute exact PCR for each transport
255
                                            stream packet (only meaningful if
256
                                            mpeg2ts_raw is TRUE). */
257
    unsigned int initial_pause:1;       /**< Do not begin to play the stream
258
                                            immediately (RTSP only). */
259
    unsigned int prealloced_context:1;
260
#if LIBAVFORMAT_VERSION_INT < (53<<16)
261
    enum CodecID video_codec_id;
262
    enum CodecID audio_codec_id;
263
#endif
264
} AVFormatParameters;
265

    
266
//! Demuxer will use url_fopen, no opened file should be provided by the caller.
267
#define AVFMT_NOFILE        0x0001
268
#define AVFMT_NEEDNUMBER    0x0002 /**< Needs '%d' in filename. */
269
#define AVFMT_SHOW_IDS      0x0008 /**< Show format stream IDs numbers. */
270
#define AVFMT_RAWPICTURE    0x0020 /**< Format wants AVPicture structure for
271
                                      raw picture data. */
272
#define AVFMT_GLOBALHEADER  0x0040 /**< Format wants global header. */
273
#define AVFMT_NOTIMESTAMPS  0x0080 /**< Format does not need / have any timestamps. */
274
#define AVFMT_GENERIC_INDEX 0x0100 /**< Use generic index building code. */
275
#define AVFMT_TS_DISCONT    0x0200 /**< Format allows timestamp discontinuities. */
276
#define AVFMT_VARIABLE_FPS  0x0400 /**< Format allows variable fps. */
277

    
278
typedef struct AVOutputFormat {
279
    const char *name;
280
    /**
281
     * Descriptive name for the format, meant to be more human-readable
282
     * than \p name. You \e should use the NULL_IF_CONFIG_SMALL() macro
283
     * to define it.
284
     */
285
    const char *long_name;
286
    const char *mime_type;
287
    const char *extensions; /**< comma-separated filename extensions */
288
    /** size of private data so that it can be allocated in the wrapper */
289
    int priv_data_size;
290
    /* output support */
291
    enum CodecID audio_codec; /**< default audio codec */
292
    enum CodecID video_codec; /**< default video codec */
293
    int (*write_header)(struct AVFormatContext *);
294
    int (*write_packet)(struct AVFormatContext *, AVPacket *pkt);
295
    int (*write_trailer)(struct AVFormatContext *);
296
    /** can use flags: AVFMT_NOFILE, AVFMT_NEEDNUMBER, AVFMT_GLOBALHEADER */
297
    int flags;
298
    /** Currently only used to set pixel format if not YUV420P. */
299
    int (*set_parameters)(struct AVFormatContext *, AVFormatParameters *);
300
    int (*interleave_packet)(struct AVFormatContext *, AVPacket *out,
301
                             AVPacket *in, int flush);
302

    
303
    /**
304
     * List of supported codec_id-codec_tag pairs, ordered by "better
305
     * choice first". The arrays are all terminated by CODEC_ID_NONE.
306
     */
307
    const struct AVCodecTag * const *codec_tag;
308

    
309
    enum CodecID subtitle_codec; /**< default subtitle codec */
310

    
311
    const AVMetadataConv *metadata_conv;
312

    
313
    /* private fields */
314
    struct AVOutputFormat *next;
315
} AVOutputFormat;
316

    
317
typedef struct AVInputFormat {
318
    const char *name;
319
    /**
320
     * Descriptive name for the format, meant to be more human-readable
321
     * than \p name. You \e should use the NULL_IF_CONFIG_SMALL() macro
322
     * to define it.
323
     */
324
    const char *long_name;
325
    /** Size of private data so that it can be allocated in the wrapper. */
326
    int priv_data_size;
327
    /**
328
     * Tell if a given file has a chance of being parsed as this format.
329
     * The buffer provided is guaranteed to be AVPROBE_PADDING_SIZE bytes
330
     * big so you do not have to check for that unless you need more.
331
     */
332
    int (*read_probe)(AVProbeData *);
333
    /** Read the format header and initialize the AVFormatContext
334
       structure. Return 0 if OK. 'ap' if non-NULL contains
335
       additional parameters. Only used in raw format right
336
       now. 'av_new_stream' should be called to create new streams.  */
337
    int (*read_header)(struct AVFormatContext *,
338
                       AVFormatParameters *ap);
339
    /** Read one packet and put it in 'pkt'. pts and flags are also
340
       set. 'av_new_stream' can be called only if the flag
341
       AVFMTCTX_NOHEADER is used. */
342
    int (*read_packet)(struct AVFormatContext *, AVPacket *pkt);
343
    /** Close the stream. The AVFormatContext and AVStreams are not
344
       freed by this function */
345
    int (*read_close)(struct AVFormatContext *);
346

    
347
#if LIBAVFORMAT_VERSION_MAJOR < 53
348
    /**
349
     * Seek to a given timestamp relative to the frames in
350
     * stream component stream_index.
351
     * @param stream_index Must not be -1.
352
     * @param flags Selects which direction should be preferred if no exact
353
     *              match is available.
354
     * @return >= 0 on success (but not necessarily the new offset)
355
     */
356
    int (*read_seek)(struct AVFormatContext *,
357
                     int stream_index, int64_t timestamp, int flags);
358
#endif
359
    /**
360
     * Gets the next timestamp in stream[stream_index].time_base units.
361
     * @return the timestamp or AV_NOPTS_VALUE if an error occurred
362
     */
363
    int64_t (*read_timestamp)(struct AVFormatContext *s, int stream_index,
364
                              int64_t *pos, int64_t pos_limit);
365
    /** Can use flags: AVFMT_NOFILE, AVFMT_NEEDNUMBER. */
366
    int flags;
367
    /** If extensions are defined, then no probe is done. You should
368
       usually not use extension format guessing because it is not
369
       reliable enough */
370
    const char *extensions;
371
    /** General purpose read-only value that the format can use. */
372
    int value;
373

    
374
    /** Start/resume playing - only meaningful if using a network-based format
375
       (RTSP). */
376
    int (*read_play)(struct AVFormatContext *);
377

    
378
    /** Pause playing - only meaningful if using a network-based format
379
       (RTSP). */
380
    int (*read_pause)(struct AVFormatContext *);
381

    
382
    const struct AVCodecTag * const *codec_tag;
383

    
384
    /**
385
     * Seek to timestamp ts.
386
     * Seeking will be done so that the point from which all active streams
387
     * can be presented successfully will be closest to ts and within min/max_ts.
388
     * Active streams are all streams that have AVStream.discard < AVDISCARD_ALL.
389
     */
390
    int (*read_seek2)(struct AVFormatContext *s, int stream_index, int64_t min_ts, int64_t ts, int64_t max_ts, int flags);
391

    
392
    const AVMetadataConv *metadata_conv;
393

    
394
    /* private fields */
395
    struct AVInputFormat *next;
396
} AVInputFormat;
397

    
398
enum AVStreamParseType {
399
    AVSTREAM_PARSE_NONE,
400
    AVSTREAM_PARSE_FULL,       /**< full parsing and repack */
401
    AVSTREAM_PARSE_HEADERS,    /**< Only parse headers, do not repack. */
402
    AVSTREAM_PARSE_TIMESTAMPS, /**< full parsing and interpolation of timestamps for frames not starting on a packet boundary */
403
};
404

    
405
typedef struct AVIndexEntry {
406
    int64_t pos;
407
    int64_t timestamp;
408
#define AVINDEX_KEYFRAME 0x0001
409
    int flags:2;
410
    int size:30; //Yeah, trying to keep the size of this small to reduce memory requirements (it is 24 vs. 32 bytes due to possible 8-byte alignment).
411
    int min_distance;         /**< Minimum distance between this and the previous keyframe, used to avoid unneeded searching. */
412
} AVIndexEntry;
413

    
414
#define AV_DISPOSITION_DEFAULT   0x0001
415
#define AV_DISPOSITION_DUB       0x0002
416
#define AV_DISPOSITION_ORIGINAL  0x0004
417
#define AV_DISPOSITION_COMMENT   0x0008
418
#define AV_DISPOSITION_LYRICS    0x0010
419
#define AV_DISPOSITION_KARAOKE   0x0020
420

    
421
/**
422
 * Stream structure.
423
 * New fields can be added to the end with minor version bumps.
424
 * Removal, reordering and changes to existing fields require a major
425
 * version bump.
426
 * sizeof(AVStream) must not be used outside libav*.
427
 */
428
typedef struct AVStream {
429
    int index;    /**< stream index in AVFormatContext */
430
    int id;       /**< format-specific stream ID */
431
    AVCodecContext *codec; /**< codec context */
432
    /**
433
     * Real base framerate of the stream.
434
     * This is the lowest framerate with which all timestamps can be
435
     * represented accurately (it is the least common multiple of all
436
     * framerates in the stream). Note, this value is just a guess!
437
     * For example, if the time base is 1/90000 and all frames have either
438
     * approximately 3600 or 1800 timer ticks, then r_frame_rate will be 50/1.
439
     */
440
    AVRational r_frame_rate;
441
    void *priv_data;
442

    
443
    /* internal data used in av_find_stream_info() */
444
    int64_t first_dts;
445
    /** encoding: pts generation when outputting stream */
446
    struct AVFrac pts;
447

    
448
    /**
449
     * This is the fundamental unit of time (in seconds) in terms
450
     * of which frame timestamps are represented. For fixed-fps content,
451
     * time base should be 1/framerate and timestamp increments should be 1.
452
     */
453
    AVRational time_base;
454
    int pts_wrap_bits; /**< number of bits in pts (used for wrapping control) */
455
    /* ffmpeg.c private use */
456
    int stream_copy; /**< If set, just copy stream. */
457
    enum AVDiscard discard; ///< Selects which packets can be discarded at will and do not need to be demuxed.
458
    //FIXME move stuff to a flags field?
459
    /** Quality, as it has been removed from AVCodecContext and put in AVVideoFrame.
460
     * MN: dunno if that is the right place for it */
461
    float quality;
462
    /**
463
     * Decoding: pts of the first frame of the stream, in stream time base.
464
     * Only set this if you are absolutely 100% sure that the value you set
465
     * it to really is the pts of the first frame.
466
     * This may be undefined (AV_NOPTS_VALUE).
467
     * @note The ASF header does NOT contain a correct start_time the ASF
468
     * demuxer must NOT set this.
469
     */
470
    int64_t start_time;
471
    /**
472
     * Decoding: duration of the stream, in stream time base.
473
     * If a source file does not specify a duration, but does specify
474
     * a bitrate, this value will be estimated from bitrate and file size.
475
     */
476
    int64_t duration;
477

    
478
    char language[4]; /** ISO 639 3-letter language code (empty string if undefined) */
479

    
480
    /* av_read_frame() support */
481
    enum AVStreamParseType need_parsing;
482
    struct AVCodecParserContext *parser;
483

    
484
    int64_t cur_dts;
485
    int last_IP_duration;
486
    int64_t last_IP_pts;
487
    /* av_seek_frame() support */
488
    AVIndexEntry *index_entries; /**< Only used if the format does not
489
                                    support seeking natively. */
490
    int nb_index_entries;
491
    unsigned int index_entries_allocated_size;
492

    
493
    int64_t nb_frames;                 ///< number of frames in this stream if known or 0
494

    
495
#if LIBAVFORMAT_VERSION_INT < (53<<16)
496
    int64_t unused[4+1];
497
#endif
498

    
499
    char *filename; /**< source filename of the stream */
500

    
501
    int disposition; /**< AV_DISPOSITION_* bit field */
502

    
503
    AVProbeData probe_data;
504
#define MAX_REORDER_DELAY 16
505
    int64_t pts_buffer[MAX_REORDER_DELAY+1];
506

    
507
    /**
508
     * sample aspect ratio (0 if unknown)
509
     * - encoding: Set by user.
510
     * - decoding: Set by libavformat.
511
     */
512
    AVRational sample_aspect_ratio;
513

    
514
    AVMetadata *metadata;
515

    
516
    /* av_read_frame() support */
517
    const uint8_t *cur_ptr;
518
    int cur_len;
519
    AVPacket cur_pkt;
520

    
521
    // Timestamp generation support:
522
    /**
523
     * Timestamp corresponding to the last dts sync point.
524
     *
525
     * Initialized when AVCodecParserContext.dts_sync_point >= 0 and
526
     * a DTS is received from the underlying container. Otherwise set to
527
     * AV_NOPTS_VALUE by default.
528
     */
529
    int64_t reference_dts;
530
} AVStream;
531

    
532
#define AV_PROGRAM_RUNNING 1
533

    
534
/**
535
 * New fields can be added to the end with minor version bumps.
536
 * Removal, reordering and changes to existing fields require a major
537
 * version bump.
538
 * sizeof(AVProgram) must not be used outside libav*.
539
 */
540
typedef struct AVProgram {
541
    int            id;
542
    char           *provider_name; ///< network name for DVB streams
543
    char           *name;          ///< service name for DVB streams
544
    int            flags;
545
    enum AVDiscard discard;        ///< selects which program to discard and which to feed to the caller
546
    unsigned int   *stream_index;
547
    unsigned int   nb_stream_indexes;
548
    AVMetadata *metadata;
549
} AVProgram;
550

    
551
#define AVFMTCTX_NOHEADER      0x0001 /**< signal that no header is present
552
                                         (streams are added dynamically) */
553

    
554
typedef struct AVChapter {
555
    int id;                 ///< unique ID to identify the chapter
556
    AVRational time_base;   ///< time base in which the start/end timestamps are specified
557
    int64_t start, end;     ///< chapter start/end time in time_base units
558
    char *title;            ///< chapter title
559
    AVMetadata *metadata;
560
} AVChapter;
561

    
562
#define MAX_STREAMS 20
563

    
564
/**
565
 * Format I/O context.
566
 * New fields can be added to the end with minor version bumps.
567
 * Removal, reordering and changes to existing fields require a major
568
 * version bump.
569
 * sizeof(AVFormatContext) must not be used outside libav*.
570
 */
571
typedef struct AVFormatContext {
572
    const AVClass *av_class; /**< Set by avformat_alloc_context. */
573
    /* Can only be iformat or oformat, not both at the same time. */
574
    struct AVInputFormat *iformat;
575
    struct AVOutputFormat *oformat;
576
    void *priv_data;
577
    ByteIOContext *pb;
578
    unsigned int nb_streams;
579
    AVStream *streams[MAX_STREAMS];
580
    char filename[1024]; /**< input or output filename */
581
    /* stream info */
582
    int64_t timestamp;
583
    char title[512];
584
    char author[512];
585
    char copyright[512];
586
    char comment[512];
587
    char album[512];
588
    int year;  /**< ID3 year, 0 if none */
589
    int track; /**< track number, 0 if none */
590
    char genre[32]; /**< ID3 genre */
591

    
592
    int ctx_flags; /**< Format-specific flags, see AVFMTCTX_xx */
593
    /* private data for pts handling (do not modify directly). */
594
    /** This buffer is only needed when packets were already buffered but
595
       not decoded, for example to get the codec parameters in MPEG
596
       streams. */
597
    struct AVPacketList *packet_buffer;
598

    
599
    /** Decoding: position of the first frame of the component, in
600
       AV_TIME_BASE fractional seconds. NEVER set this value directly:
601
       It is deduced from the AVStream values.  */
602
    int64_t start_time;
603
    /** Decoding: duration of the stream, in AV_TIME_BASE fractional
604
       seconds. NEVER set this value directly: it is deduced from the
605
       AVStream values.  */
606
    int64_t duration;
607
    /** decoding: total file size, 0 if unknown */
608
    int64_t file_size;
609
    /** Decoding: total stream bitrate in bit/s, 0 if not
610
       available. Never set it directly if the file_size and the
611
       duration are known as FFmpeg can compute it automatically. */
612
    int bit_rate;
613

    
614
    /* av_read_frame() support */
615
    AVStream *cur_st;
616
#if LIBAVFORMAT_VERSION_INT < (53<<16)
617
    const uint8_t *cur_ptr_deprecated;
618
    int cur_len_deprecated;
619
    AVPacket cur_pkt_deprecated;
620
#endif
621

    
622
    /* av_seek_frame() support */
623
    int64_t data_offset; /** offset of the first packet */
624
    int index_built;
625

    
626
    int mux_rate;
627
    int packet_size;
628
    int preload;
629
    int max_delay;
630

    
631
#define AVFMT_NOOUTPUTLOOP -1
632
#define AVFMT_INFINITEOUTPUTLOOP 0
633
    /** number of times to loop output in formats that support it */
634
    int loop_output;
635

    
636
    int flags;
637
#define AVFMT_FLAG_GENPTS       0x0001 ///< Generate missing pts even if it requires parsing future frames.
638
#define AVFMT_FLAG_IGNIDX       0x0002 ///< Ignore index.
639
#define AVFMT_FLAG_NONBLOCK     0x0004 ///< Do not block when reading packets from input.
640

    
641
    int loop_input;
642
    /** decoding: size of data to probe; encoding: unused. */
643
    unsigned int probesize;
644

    
645
    /**
646
     * Maximum time (in AV_TIME_BASE units) during which the input should
647
     * be analyzed in av_find_stream_info().
648
     */
649
    int max_analyze_duration;
650

    
651
    const uint8_t *key;
652
    int keylen;
653

    
654
    unsigned int nb_programs;
655
    AVProgram **programs;
656

    
657
    /**
658
     * Forced video codec_id.
659
     * Demuxing: Set by user.
660
     */
661
    enum CodecID video_codec_id;
662
    /**
663
     * Forced audio codec_id.
664
     * Demuxing: Set by user.
665
     */
666
    enum CodecID audio_codec_id;
667
    /**
668
     * Forced subtitle codec_id.
669
     * Demuxing: Set by user.
670
     */
671
    enum CodecID subtitle_codec_id;
672

    
673
    /**
674
     * Maximum amount of memory in bytes to use for the index of each stream.
675
     * If the index exceeds this size, entries will be discarded as
676
     * needed to maintain a smaller size. This can lead to slower or less
677
     * accurate seeking (depends on demuxer).
678
     * Demuxers for which a full in-memory index is mandatory will ignore
679
     * this.
680
     * muxing  : unused
681
     * demuxing: set by user
682
     */
683
    unsigned int max_index_size;
684

    
685
    /**
686
     * Maximum amount of memory in bytes to use for buffering frames
687
     * obtained from realtime capture devices.
688
     */
689
    unsigned int max_picture_buffer;
690

    
691
    unsigned int nb_chapters;
692
    AVChapter **chapters;
693

    
694
    /**
695
     * Flags to enable debugging.
696
     */
697
    int debug;
698
#define FF_FDEBUG_TS        0x0001
699

    
700
    /**
701
     * Raw packets from the demuxer, prior to parsing and decoding.
702
     * This buffer is used for buffering packets until the codec can
703
     * be identified, as parsing cannot be done without knowing the
704
     * codec.
705
     */
706
    struct AVPacketList *raw_packet_buffer;
707
    struct AVPacketList *raw_packet_buffer_end;
708

    
709
    struct AVPacketList *packet_buffer_end;
710

    
711
    AVMetadata *metadata;
712
} AVFormatContext;
713

    
714
typedef struct AVPacketList {
715
    AVPacket pkt;
716
    struct AVPacketList *next;
717
} AVPacketList;
718

    
719
#if LIBAVFORMAT_VERSION_INT < (53<<16)
720
extern AVInputFormat *first_iformat;
721
extern AVOutputFormat *first_oformat;
722
#endif
723

    
724
/**
725
 * If f is NULL, returns the first registered input format,
726
 * if f is non-NULL, returns the next registered input format after f
727
 * or NULL if f is the last one.
728
 */
729
AVInputFormat  *av_iformat_next(AVInputFormat  *f);
730

    
731
/**
732
 * If f is NULL, returns the first registered output format,
733
 * if f is non-NULL, returns the next registered output format after f
734
 * or NULL if f is the last one.
735
 */
736
AVOutputFormat *av_oformat_next(AVOutputFormat *f);
737

    
738
enum CodecID av_guess_image2_codec(const char *filename);
739

    
740
/* XXX: Use automatic init with either ELF sections or C file parser */
741
/* modules. */
742

    
743
/* utils.c */
744
void av_register_input_format(AVInputFormat *format);
745
void av_register_output_format(AVOutputFormat *format);
746
AVOutputFormat *guess_stream_format(const char *short_name,
747
                                    const char *filename,
748
                                    const char *mime_type);
749
AVOutputFormat *guess_format(const char *short_name,
750
                             const char *filename,
751
                             const char *mime_type);
752

    
753
/**
754
 * Guesses the codec ID based upon muxer and filename.
755
 */
756
enum CodecID av_guess_codec(AVOutputFormat *fmt, const char *short_name,
757
                            const char *filename, const char *mime_type,
758
                            enum CodecType type);
759

    
760
/**
761
 * Send a nice hexadecimal dump of a buffer to the specified file stream.
762
 *
763
 * @param f The file stream pointer where the dump should be sent to.
764
 * @param buf buffer
765
 * @param size buffer size
766
 *
767
 * @see av_hex_dump_log, av_pkt_dump, av_pkt_dump_log
768
 */
769
void av_hex_dump(FILE *f, uint8_t *buf, int size);
770

    
771
/**
772
 * Send a nice hexadecimal dump of a buffer to the log.
773
 *
774
 * @param avcl A pointer to an arbitrary struct of which the first field is a
775
 * pointer to an AVClass struct.
776
 * @param level The importance level of the message, lower values signifying
777
 * higher importance.
778
 * @param buf buffer
779
 * @param size buffer size
780
 *
781
 * @see av_hex_dump, av_pkt_dump, av_pkt_dump_log
782
 */
783
void av_hex_dump_log(void *avcl, int level, uint8_t *buf, int size);
784

    
785
/**
786
 * Send a nice dump of a packet to the specified file stream.
787
 *
788
 * @param f The file stream pointer where the dump should be sent to.
789
 * @param pkt packet to dump
790
 * @param dump_payload True if the payload must be displayed, too.
791
 */
792
void av_pkt_dump(FILE *f, AVPacket *pkt, int dump_payload);
793

    
794
/**
795
 * Send a nice dump of a packet to the log.
796
 *
797
 * @param avcl A pointer to an arbitrary struct of which the first field is a
798
 * pointer to an AVClass struct.
799
 * @param level The importance level of the message, lower values signifying
800
 * higher importance.
801
 * @param pkt packet to dump
802
 * @param dump_payload True if the payload must be displayed, too.
803
 */
804
void av_pkt_dump_log(void *avcl, int level, AVPacket *pkt, int dump_payload);
805

    
806
/**
807
 * Initialize libavformat and register all the muxers, demuxers and
808
 * protocols. If you do not call this function, then you can select
809
 * exactly which formats you want to support.
810
 *
811
 * @see av_register_input_format()
812
 * @see av_register_output_format()
813
 * @see av_register_protocol()
814
 */
815
void av_register_all(void);
816

    
817
/** codec tag <-> codec id */
818
enum CodecID av_codec_get_id(const struct AVCodecTag * const *tags, unsigned int tag);
819
unsigned int av_codec_get_tag(const struct AVCodecTag * const *tags, enum CodecID id);
820

    
821
/* media file input */
822

    
823
/**
824
 * Finds AVInputFormat based on the short name of the input format.
825
 */
826
AVInputFormat *av_find_input_format(const char *short_name);
827

    
828
/**
829
 * Guess file format.
830
 *
831
 * @param is_opened Whether the file is already opened; determines whether
832
 *                  demuxers with or without AVFMT_NOFILE are probed.
833
 */
834
AVInputFormat *av_probe_input_format(AVProbeData *pd, int is_opened);
835

    
836
/**
837
 * Allocates all the structures needed to read an input stream.
838
 *        This does not open the needed codecs for decoding the stream[s].
839
 */
840
int av_open_input_stream(AVFormatContext **ic_ptr,
841
                         ByteIOContext *pb, const char *filename,
842
                         AVInputFormat *fmt, AVFormatParameters *ap);
843

    
844
/**
845
 * Open a media file as input. The codecs are not opened. Only the file
846
 * header (if present) is read.
847
 *
848
 * @param ic_ptr The opened media file handle is put here.
849
 * @param filename filename to open
850
 * @param fmt If non-NULL, force the file format to use.
851
 * @param buf_size optional buffer size (zero if default is OK)
852
 * @param ap Additional parameters needed when opening the file
853
 *           (NULL if default).
854
 * @return 0 if OK, AVERROR_xxx otherwise
855
 */
856
int av_open_input_file(AVFormatContext **ic_ptr, const char *filename,
857
                       AVInputFormat *fmt,
858
                       int buf_size,
859
                       AVFormatParameters *ap);
860

    
861
#if LIBAVFORMAT_VERSION_MAJOR < 53
862
/**
863
 * @deprecated Use avformat_alloc_context() instead.
864
 */
865
attribute_deprecated AVFormatContext *av_alloc_format_context(void);
866
#endif
867

    
868
/**
869
 * Allocate an AVFormatContext.
870
 * Can be freed with av_free() but do not forget to free everything you
871
 * explicitly allocated as well!
872
 */
873
AVFormatContext *avformat_alloc_context(void);
874

    
875
/**
876
 * Read packets of a media file to get stream information. This
877
 * is useful for file formats with no headers such as MPEG. This
878
 * function also computes the real framerate in case of MPEG-2 repeat
879
 * frame mode.
880
 * The logical file position is not changed by this function;
881
 * examined packets may be buffered for later processing.
882
 *
883
 * @param ic media file handle
884
 * @return >=0 if OK, AVERROR_xxx on error
885
 * @todo Let the user decide somehow what information is needed so that
886
 *       we do not waste time getting stuff the user does not need.
887
 */
888
int av_find_stream_info(AVFormatContext *ic);
889

    
890
/**
891
 * Read a transport packet from a media file.
892
 *
893
 * This function is obsolete and should never be used.
894
 * Use av_read_frame() instead.
895
 *
896
 * @param s media file handle
897
 * @param pkt is filled
898
 * @return 0 if OK, AVERROR_xxx on error
899
 */
900
int av_read_packet(AVFormatContext *s, AVPacket *pkt);
901

    
902
/**
903
 * Return the next frame of a stream.
904
 *
905
 * The returned packet is valid
906
 * until the next av_read_frame() or until av_close_input_file() and
907
 * must be freed with av_free_packet. For video, the packet contains
908
 * exactly one frame. For audio, it contains an integer number of
909
 * frames if each frame has a known fixed size (e.g. PCM or ADPCM
910
 * data). If the audio frames have a variable size (e.g. MPEG audio),
911
 * then it contains one frame.
912
 *
913
 * pkt->pts, pkt->dts and pkt->duration are always set to correct
914
 * values in AVStream.time_base units (and guessed if the format cannot
915
 * provide them). pkt->pts can be AV_NOPTS_VALUE if the video format
916
 * has B-frames, so it is better to rely on pkt->dts if you do not
917
 * decompress the payload.
918
 *
919
 * @return 0 if OK, < 0 on error or end of file
920
 */
921
int av_read_frame(AVFormatContext *s, AVPacket *pkt);
922

    
923
/**
924
 * Seek to the keyframe at timestamp.
925
 * 'timestamp' in 'stream_index'.
926
 * @param stream_index If stream_index is (-1), a default
927
 * stream is selected, and timestamp is automatically converted
928
 * from AV_TIME_BASE units to the stream specific time_base.
929
 * @param timestamp Timestamp in AVStream.time_base units
930
 *        or, if no stream is specified, in AV_TIME_BASE units.
931
 * @param flags flags which select direction and seeking mode
932
 * @return >= 0 on success
933
 */
934
int av_seek_frame(AVFormatContext *s, int stream_index, int64_t timestamp,
935
                  int flags);
936

    
937
/**
938
 * Seek to timestamp ts.
939
 * Seeking will be done so that the point from which all active streams
940
 * can be presented successfully will be closest to ts and within min/max_ts.
941
 * Active streams are all streams that have AVStream.discard < AVDISCARD_ALL.
942
 *
943
 * If flags contain AVSEEK_FLAG_BYTE, then all timestamps are in bytes and
944
 * are the file position (this may not be supported by all demuxers).
945
 * If flags contain AVSEEK_FLAG_FRAME, then all timestamps are in frames
946
 * in the stream with stream_index (this may not be supported by all demuxers).
947
 * Otherwise all timestamps are in units of the stream selected by stream_index
948
 * or if stream_index is -1, in AV_TIME_BASE units.
949
 * If flags contain AVSEEK_FLAG_ANY, then non-keyframes are treated as
950
 * keyframes (this may not be supported by all demuxers).
951
 *
952
 * @param stream_index index of the stream which is used as time base reference
953
 * @param min_ts smallest acceptable timestamp
954
 * @param ts target timestamp
955
 * @param max_ts largest acceptable timestamp
956
 * @param flags flags
957
 * @returns >=0 on success, error code otherwise
958
 *
959
 * @NOTE This is part of the new seek API which is still under construction.
960
 *       Thus do not use this yet. It may change at any time, do not expect
961
 *       ABI compatibility yet!
962
 */
963
int avformat_seek_file(AVFormatContext *s, int stream_index, int64_t min_ts, int64_t ts, int64_t max_ts, int flags);
964

    
965
/**
966
 * Start playing a network-based stream (e.g. RTSP stream) at the
967
 * current position.
968
 */
969
int av_read_play(AVFormatContext *s);
970

    
971
/**
972
 * Pause a network-based stream (e.g. RTSP stream).
973
 *
974
 * Use av_read_play() to resume it.
975
 */
976
int av_read_pause(AVFormatContext *s);
977

    
978
/**
979
 * Free a AVFormatContext allocated by av_open_input_stream.
980
 * @param s context to free
981
 */
982
void av_close_input_stream(AVFormatContext *s);
983

    
984
/**
985
 * Close a media file (but not its codecs).
986
 *
987
 * @param s media file handle
988
 */
989
void av_close_input_file(AVFormatContext *s);
990

    
991
/**
992
 * Add a new stream to a media file.
993
 *
994
 * Can only be called in the read_header() function. If the flag
995
 * AVFMTCTX_NOHEADER is in the format context, then new streams
996
 * can be added in read_packet too.
997
 *
998
 * @param s media file handle
999
 * @param id file-format-dependent stream ID
1000
 */
1001
AVStream *av_new_stream(AVFormatContext *s, int id);
1002
AVProgram *av_new_program(AVFormatContext *s, int id);
1003

    
1004
/**
1005
 * Add a new chapter.
1006
 * This function is NOT part of the public API
1007
 * and should ONLY be used by demuxers.
1008
 *
1009
 * @param s media file handle
1010
 * @param id unique ID for this chapter
1011
 * @param start chapter start time in time_base units
1012
 * @param end chapter end time in time_base units
1013
 * @param title chapter title
1014
 *
1015
 * @return AVChapter or NULL on error
1016
 */
1017
AVChapter *ff_new_chapter(AVFormatContext *s, int id, AVRational time_base,
1018
                          int64_t start, int64_t end, const char *title);
1019

    
1020
/**
1021
 * Set the pts for a given stream.
1022
 *
1023
 * @param s stream
1024
 * @param pts_wrap_bits number of bits effectively used by the pts
1025
 *        (used for wrap control, 33 is the value for MPEG)
1026
 * @param pts_num numerator to convert to seconds (MPEG: 1)
1027
 * @param pts_den denominator to convert to seconds (MPEG: 90000)
1028
 */
1029
void av_set_pts_info(AVStream *s, int pts_wrap_bits,
1030
                     int pts_num, int pts_den);
1031

    
1032
#define AVSEEK_FLAG_BACKWARD 1 ///< seek backward
1033
#define AVSEEK_FLAG_BYTE     2 ///< seeking based on position in bytes
1034
#define AVSEEK_FLAG_ANY      4 ///< seek to any frame, even non-keyframes
1035

    
1036
int av_find_default_stream_index(AVFormatContext *s);
1037

    
1038
/**
1039
 * Gets the index for a specific timestamp.
1040
 * @param flags if AVSEEK_FLAG_BACKWARD then the returned index will correspond
1041
 *                 to the timestamp which is <= the requested one, if backward
1042
 *                 is 0, then it will be >=
1043
 *              if AVSEEK_FLAG_ANY seek to any frame, only keyframes otherwise
1044
 * @return < 0 if no such timestamp could be found
1045
 */
1046
int av_index_search_timestamp(AVStream *st, int64_t timestamp, int flags);
1047

    
1048
/**
1049
 * Ensures the index uses less memory than the maximum specified in
1050
 * AVFormatContext.max_index_size by discarding entries if it grows
1051
 * too large.
1052
 * This function is not part of the public API and should only be called
1053
 * by demuxers.
1054
 */
1055
void ff_reduce_index(AVFormatContext *s, int stream_index);
1056

    
1057
/**
1058
 * Add an index entry into a sorted list. Update the entry if the list
1059
 * already contains it.
1060
 *
1061
 * @param timestamp timestamp in the time base of the given stream
1062
 */
1063
int av_add_index_entry(AVStream *st, int64_t pos, int64_t timestamp,
1064
                       int size, int distance, int flags);
1065

    
1066
/**
1067
 * Does a binary search using av_index_search_timestamp() and
1068
 * AVCodec.read_timestamp().
1069
 * This is not supposed to be called directly by a user application,
1070
 * but by demuxers.
1071
 * @param target_ts target timestamp in the time base of the given stream
1072
 * @param stream_index stream number
1073
 */
1074
int av_seek_frame_binary(AVFormatContext *s, int stream_index,
1075
                         int64_t target_ts, int flags);
1076

    
1077
/**
1078
 * Updates cur_dts of all streams based on the given timestamp and AVStream.
1079
 *
1080
 * Stream ref_st unchanged, others set cur_dts in their native time base.
1081
 * Only needed for timestamp wrapping or if (dts not set and pts!=dts).
1082
 * @param timestamp new dts expressed in time_base of param ref_st
1083
 * @param ref_st reference stream giving time_base of param timestamp
1084
 */
1085
void av_update_cur_dts(AVFormatContext *s, AVStream *ref_st, int64_t timestamp);
1086

    
1087
/**
1088
 * Does a binary search using read_timestamp().
1089
 * This is not supposed to be called directly by a user application,
1090
 * but by demuxers.
1091
 * @param target_ts target timestamp in the time base of the given stream
1092
 * @param stream_index stream number
1093
 */
1094
int64_t av_gen_search(AVFormatContext *s, int stream_index,
1095
                      int64_t target_ts, int64_t pos_min,
1096
                      int64_t pos_max, int64_t pos_limit,
1097
                      int64_t ts_min, int64_t ts_max,
1098
                      int flags, int64_t *ts_ret,
1099
                      int64_t (*read_timestamp)(struct AVFormatContext *, int , int64_t *, int64_t ));
1100

    
1101
/** media file output */
1102
int av_set_parameters(AVFormatContext *s, AVFormatParameters *ap);
1103

    
1104
/**
1105
 * Allocate the stream private data and write the stream header to an
1106
 * output media file.
1107
 *
1108
 * @param s media file handle
1109
 * @return 0 if OK, AVERROR_xxx on error
1110
 */
1111
int av_write_header(AVFormatContext *s);
1112

    
1113
/**
1114
 * Write a packet to an output media file.
1115
 *
1116
 * The packet shall contain one audio or video frame.
1117
 * The packet must be correctly interleaved according to the container
1118
 * specification, if not then av_interleaved_write_frame must be used.
1119
 *
1120
 * @param s media file handle
1121
 * @param pkt The packet, which contains the stream_index, buf/buf_size,
1122
              dts/pts, ...
1123
 * @return < 0 on error, = 0 if OK, 1 if end of stream wanted
1124
 */
1125
int av_write_frame(AVFormatContext *s, AVPacket *pkt);
1126

    
1127
/**
1128
 * Writes a packet to an output media file ensuring correct interleaving.
1129
 *
1130
 * The packet must contain one audio or video frame.
1131
 * If the packets are already correctly interleaved, the application should
1132
 * call av_write_frame() instead as it is slightly faster. It is also important
1133
 * to keep in mind that completely non-interleaved input will need huge amounts
1134
 * of memory to interleave with this, so it is preferable to interleave at the
1135
 * demuxer level.
1136
 *
1137
 * @param s media file handle
1138
 * @param pkt The packet, which contains the stream_index, buf/buf_size,
1139
              dts/pts, ...
1140
 * @return < 0 on error, = 0 if OK, 1 if end of stream wanted
1141
 */
1142
int av_interleaved_write_frame(AVFormatContext *s, AVPacket *pkt);
1143

    
1144
/**
1145
 * Interleave a packet per dts in an output media file.
1146
 *
1147
 * Packets with pkt->destruct == av_destruct_packet will be freed inside this
1148
 * function, so they cannot be used after it. Note that calling av_free_packet()
1149
 * on them is still safe.
1150
 *
1151
 * @param s media file handle
1152
 * @param out the interleaved packet will be output here
1153
 * @param in the input packet
1154
 * @param flush 1 if no further packets are available as input and all
1155
 *              remaining packets should be output
1156
 * @return 1 if a packet was output, 0 if no packet could be output,
1157
 *         < 0 if an error occurred
1158
 */
1159
int av_interleave_packet_per_dts(AVFormatContext *s, AVPacket *out,
1160
                                 AVPacket *pkt, int flush);
1161

    
1162
/**
1163
 * @brief Write the stream trailer to an output media file and
1164
 *        free the file private data.
1165
 *
1166
 * May only be called after a successful call to av_write_header.
1167
 *
1168
 * @param s media file handle
1169
 * @return 0 if OK, AVERROR_xxx on error
1170
 */
1171
int av_write_trailer(AVFormatContext *s);
1172

    
1173
void dump_format(AVFormatContext *ic,
1174
                 int index,
1175
                 const char *url,
1176
                 int is_output);
1177

    
1178
#if LIBAVFORMAT_VERSION_MAJOR < 53
1179
/**
1180
 * Parses width and height out of string str.
1181
 * @deprecated Use av_parse_video_frame_size instead.
1182
 */
1183
attribute_deprecated int parse_image_size(int *width_ptr, int *height_ptr,
1184
                                          const char *str);
1185

    
1186
/**
1187
 * Converts framerate from a string to a fraction.
1188
 * @deprecated Use av_parse_video_frame_rate instead.
1189
 */
1190
attribute_deprecated int parse_frame_rate(int *frame_rate, int *frame_rate_base,
1191
                                          const char *arg);
1192
#endif
1193

    
1194
/**
1195
 * Parses \p datestr and returns a corresponding number of microseconds.
1196
 * @param datestr String representing a date or a duration.
1197
 * - If a date the syntax is:
1198
 * @code
1199
 *  [{YYYY-MM-DD|YYYYMMDD}]{T| }{HH[:MM[:SS[.m...]]][Z]|HH[MM[SS[.m...]]][Z]}
1200
 * @endcode
1201
 * Time is local time unless Z is appended, in which case it is
1202
 * interpreted as UTC.
1203
 * If the year-month-day part is not specified it takes the current
1204
 * year-month-day.
1205
 * Returns the number of microseconds since 1st of January, 1970 up to
1206
 * the time of the parsed date or INT64_MIN if \p datestr cannot be
1207
 * successfully parsed.
1208
 * - If a duration the syntax is:
1209
 * @code
1210
 *  [-]HH[:MM[:SS[.m...]]]
1211
 *  [-]S+[.m...]
1212
 * @endcode
1213
 * Returns the number of microseconds contained in a time interval
1214
 * with the specified duration or INT64_MIN if \p datestr cannot be
1215
 * successfully parsed.
1216
 * @param duration Flag which tells how to interpret \p datestr, if
1217
 * not zero \p datestr is interpreted as a duration, otherwise as a
1218
 * date.
1219
 */
1220
int64_t parse_date(const char *datestr, int duration);
1221

    
1222
/** Gets the current time in microseconds. */
1223
int64_t av_gettime(void);
1224

    
1225
/* ffm-specific for ffserver */
1226
#define FFM_PACKET_SIZE 4096
1227
int64_t ffm_read_write_index(int fd);
1228
int ffm_write_write_index(int fd, int64_t pos);
1229
void ffm_set_write_index(AVFormatContext *s, int64_t pos, int64_t file_size);
1230

    
1231
/**
1232
 * Attempts to find a specific tag in a URL.
1233
 *
1234
 * syntax: '?tag1=val1&tag2=val2...'. Little URL decoding is done.
1235
 * Return 1 if found.
1236
 */
1237
int find_info_tag(char *arg, int arg_size, const char *tag1, const char *info);
1238

    
1239
/**
1240
 * Returns in 'buf' the path with '%d' replaced by a number.
1241
 *
1242
 * Also handles the '%0nd' format where 'n' is the total number
1243
 * of digits and '%%'.
1244
 *
1245
 * @param buf destination buffer
1246
 * @param buf_size destination buffer size
1247
 * @param path numbered sequence string
1248
 * @param number frame number
1249
 * @return 0 if OK, -1 on format error
1250
 */
1251
int av_get_frame_filename(char *buf, int buf_size,
1252
                          const char *path, int number);
1253

    
1254
/**
1255
 * Check whether filename actually is a numbered sequence generator.
1256
 *
1257
 * @param filename possible numbered sequence string
1258
 * @return 1 if a valid numbered sequence string, 0 otherwise
1259
 */
1260
int av_filename_number_test(const char *filename);
1261

    
1262
/**
1263
 * Generate an SDP for an RTP session.
1264
 *
1265
 * @param ac array of AVFormatContexts describing the RTP streams. If the
1266
 *           array is composed by only one context, such context can contain
1267
 *           multiple AVStreams (one AVStream per RTP stream). Otherwise,
1268
 *           all the contexts in the array (an AVCodecContext per RTP stream)
1269
 *           must contain only one AVStream.
1270
 * @param n_files number of AVCodecContexts contained in ac
1271
 * @param buff buffer where the SDP will be stored (must be allocated by
1272
 *             the caller)
1273
 * @param size the size of the buffer
1274
 * @return 0 if OK, AVERROR_xxx on error
1275
 */
1276
int avf_sdp_create(AVFormatContext *ac[], int n_files, char *buff, int size);
1277

    
1278
#ifdef HAVE_AV_CONFIG_H
1279

    
1280
void ff_dynarray_add(intptr_t **tab_ptr, int *nb_ptr, intptr_t elem);
1281

    
1282
#ifdef __GNUC__
1283
#define dynarray_add(tab, nb_ptr, elem)\
1284
do {\
1285
    __typeof__(tab) _tab = (tab);\
1286
    __typeof__(elem) _elem = (elem);\
1287
    (void)sizeof(**_tab == _elem); /* check that types are compatible */\
1288
    ff_dynarray_add((intptr_t **)_tab, nb_ptr, (intptr_t)_elem);\
1289
} while(0)
1290
#else
1291
#define dynarray_add(tab, nb_ptr, elem)\
1292
do {\
1293
    ff_dynarray_add((intptr_t **)(tab), nb_ptr, (intptr_t)(elem));\
1294
} while(0)
1295
#endif
1296

    
1297
time_t mktimegm(struct tm *tm);
1298
struct tm *brktimegm(time_t secs, struct tm *tm);
1299
const char *small_strptime(const char *p, const char *fmt,
1300
                           struct tm *dt);
1301

    
1302
struct in_addr;
1303
int resolve_host(struct in_addr *sin_addr, const char *hostname);
1304

    
1305
void url_split(char *proto, int proto_size,
1306
               char *authorization, int authorization_size,
1307
               char *hostname, int hostname_size,
1308
               int *port_ptr,
1309
               char *path, int path_size,
1310
               const char *url);
1311

    
1312
int match_ext(const char *filename, const char *extensions);
1313

    
1314
#endif /* HAVE_AV_CONFIG_H */
1315

    
1316
#endif /* AVFORMAT_AVFORMAT_H */