libavformat/avformat.h

   1 #ifndef AVFORMAT_H
   2 #define AVFORMAT_H
   3
   4 #ifdef __cplusplus
   5 extern "C" {
   6 #endif
   7
   8 #define LIBAVFORMAT_VERSION_INT ((50<<16)+(4<<8)+0)
   9 #define LIBAVFORMAT_VERSION     50.4.0
  10 #define LIBAVFORMAT_BUILD       LIBAVFORMAT_VERSION_INT
  11
  12 #define LIBAVFORMAT_IDENT       "Lavf" AV_STRINGIFY(LIBAVFORMAT_VERSION)
  13
  14 #include <time.h>
  15 #include <stdio.h>  /* FILE */
  16 #include "avcodec.h"
  17
  18 #include "avio.h"
  19
  20 /* packet functions */
  21
  22 #ifndef MAXINT64
  23 #define MAXINT64 int64_t_C(0x7fffffffffffffff)
  24 #endif
  25
  26 #ifndef MININT64
  27 #define MININT64 int64_t_C(0x8000000000000000)
  28 #endif
  29
  30 typedef struct AVPacket {
  31     int64_t pts;                            ///< presentation time stamp in time_base units
  32     int64_t dts;                            ///< decompression time stamp in time_base units
  33     uint8_t *data;
  34     int   size;
  35     int   stream_index;
  36     int   flags;
  37     int   duration;                         ///< presentation duration in time_base units (0 if not available)
  38     void  (*destruct)(struct AVPacket *);
  39     void  *priv;
  40     int64_t pos;                            ///< byte position in stream, -1 if unknown
  41 } AVPacket;
  42 #define PKT_FLAG_KEY   0x0001
  43
  44 void av_destruct_packet_nofree(AVPacket *pkt);
  45 void av_destruct_packet(AVPacket *pkt);
  46
  47 /* initialize optional fields of a packet */
  48 static inline void av_init_packet(AVPacket *pkt)
  49 {
  50     pkt->pts   = AV_NOPTS_VALUE;
  51     pkt->dts   = AV_NOPTS_VALUE;
  52     pkt->pos   = -1;
  53     pkt->duration = 0;
  54     pkt->flags = 0;
  55     pkt->stream_index = 0;
  56     pkt->destruct= av_destruct_packet_nofree;
  57 }
  58
  59 int av_new_packet(AVPacket *pkt, int size);
  60 int av_get_packet(ByteIOContext *s, AVPacket *pkt, int size);
  61 int av_dup_packet(AVPacket *pkt);
  62
  63 /**
  64  * Free a packet
  65  *
  66  * @param pkt packet to free
  67  */
  68 static inline void av_free_packet(AVPacket *pkt)
  69 {
  70     if (pkt && pkt->destruct) {
  71         pkt->destruct(pkt);
  72     }
  73 }
  74
  75 /*************************************************/
  76 /* fractional numbers for exact pts handling */
  77
  78 /* the exact value of the fractional number is: 'val + num / den'. num
  79    is assumed to be such as 0 <= num < den */
  80 typedef struct AVFrac {
  81     int64_t val, num, den;
  82 } AVFrac;
  83
  84 void av_frac_init(AVFrac *f, int64_t val, int64_t num, int64_t den);
  85 void av_frac_add(AVFrac *f, int64_t incr);
  86 void av_frac_set(AVFrac *f, int64_t val);
  87
  88 /*************************************************/
  89 /* input/output formats */
  90
  91 struct AVFormatContext;
  92
  93 /* this structure contains the data a format has to probe a file */
  94 typedef struct AVProbeData {
  95     const char *filename;
  96     unsigned char *buf;
  97     int buf_size;
  98 } AVProbeData;
  99
 100 #define AVPROBE_SCORE_MAX 100
 101
 102 typedef struct AVFormatParameters {
 103     AVRational time_base;
 104     int sample_rate;
 105     int channels;
 106     int width;
 107     int height;
 108     enum PixelFormat pix_fmt;
 109     struct AVImageFormat *image_format;
 110     int channel; /* used to select dv channel */
 111     const char *device; /* video, audio or DV device */
 112     const char *standard; /* tv standard, NTSC, PAL, SECAM */
 113     int mpeg2ts_raw:1;  /* force raw MPEG2 transport stream output, if possible */
 114     int mpeg2ts_compute_pcr:1; /* compute exact PCR for each transport
 115                                   stream packet (only meaningful if
 116                                   mpeg2ts_raw is TRUE */
 117     int initial_pause:1;       /* do not begin to play the stream
 118                                   immediately (RTSP only) */
 119     enum CodecID video_codec_id;
 120     enum CodecID audio_codec_id;
 121 } AVFormatParameters;
 122
 123 #define AVFMT_NOFILE        0x0001 /* no file should be opened */
 124 #define AVFMT_NEEDNUMBER    0x0002 /* needs '%d' in filename */
 125 #define AVFMT_SHOW_IDS      0x0008 /* show format stream IDs numbers */
 126 #define AVFMT_RAWPICTURE    0x0020 /* format wants AVPicture structure for
 127                                       raw picture data */
 128 #define AVFMT_GLOBALHEADER  0x0040 /* format wants global header */
 129
 130 typedef struct AVOutputFormat {
 131     const char *name;
 132     const char *long_name;
 133     const char *mime_type;
 134     const char *extensions; /* comma separated extensions */
 135     /* size of private data so that it can be allocated in the wrapper */
 136     int priv_data_size;
 137     /* output support */
 138     enum CodecID audio_codec; /* default audio codec */
 139     enum CodecID video_codec; /* default video codec */
 140     int (*write_header)(struct AVFormatContext *);
 141     int (*write_packet)(struct AVFormatContext *, AVPacket *pkt);
 142     int (*write_trailer)(struct AVFormatContext *);
 143     /* can use flags: AVFMT_NOFILE, AVFMT_NEEDNUMBER, AVFMT_GLOBALHEADER */
 144     int flags;
 145     /* currently only used to set pixel format if not YUV420P */
 146     int (*set_parameters)(struct AVFormatContext *, AVFormatParameters *);
 147     int (*interleave_packet)(struct AVFormatContext *, AVPacket *out, AVPacket *in, int flush);
 148     /* private fields */
 149     struct AVOutputFormat *next;
 150 } AVOutputFormat;
 151
 152 typedef struct AVInputFormat {
 153     const char *name;
 154     const char *long_name;
 155     /* size of private data so that it can be allocated in the wrapper */
 156     int priv_data_size;
 157     /* tell if a given file has a chance of being parsing by this format */
 158     int (*read_probe)(AVProbeData *);
 159     /* read the format header and initialize the AVFormatContext
 160        structure. Return 0 if OK. 'ap' if non NULL contains
 161        additionnal paramters. Only used in raw format right
 162        now. 'av_new_stream' should be called to create new streams.  */
 163     int (*read_header)(struct AVFormatContext *,
 164                        AVFormatParameters *ap);
 165     /* read one packet and put it in 'pkt'. pts and flags are also
 166        set. 'av_new_stream' can be called only if the flag
 167        AVFMTCTX_NOHEADER is used. */
 168     int (*read_packet)(struct AVFormatContext *, AVPacket *pkt);
 169     /* close the stream. The AVFormatContext and AVStreams are not
 170        freed by this function */
 171     int (*read_close)(struct AVFormatContext *);
 172     /**
 173      * seek to a given timestamp relative to the frames in
 174      * stream component stream_index
 175      * @param stream_index must not be -1
 176      * @param flags selects which direction should be preferred if no exact
 177      *              match is available
 178      */
 179     int (*read_seek)(struct AVFormatContext *,
 180                      int stream_index, int64_t timestamp, int flags);
 181     /**
 182      * gets the next timestamp in AV_TIME_BASE units.
 183      */
 184     int64_t (*read_timestamp)(struct AVFormatContext *s, int stream_index,
 185                               int64_t *pos, int64_t pos_limit);
 186     /* can use flags: AVFMT_NOFILE, AVFMT_NEEDNUMBER */
 187     int flags;
 188     /* if extensions are defined, then no probe is done. You should
 189        usually not use extension format guessing because it is not
 190        reliable enough */
 191     const char *extensions;
 192     /* general purpose read only value that the format can use */
 193     int value;
 194
 195     /* start/resume playing - only meaningful if using a network based format
 196        (RTSP) */
 197     int (*read_play)(struct AVFormatContext *);
 198
 199     /* pause playing - only meaningful if using a network based format
 200        (RTSP) */
 201     int (*read_pause)(struct AVFormatContext *);
 202
 203     /* private fields */
 204     struct AVInputFormat *next;
 205 } AVInputFormat;
 206
 207 typedef struct AVIndexEntry {
 208     int64_t pos;
 209     int64_t timestamp;
 210 #define AVINDEX_KEYFRAME 0x0001
 211     int flags:2;
 212     int size:30; //yeah trying to keep the size of this small to reduce memory requirements (its 24 vs 32 byte due to possible 8byte align)
 213     int min_distance;         /* min distance between this and the previous keyframe, used to avoid unneeded searching */
 214 } AVIndexEntry;
 215
 216 typedef struct AVStream {
 217     int index;    /* stream index in AVFormatContext */
 218     int id;       /* format specific stream id */
 219     AVCodecContext *codec; /* codec context */
 220     /**
 221      * real base frame rate of the stream.
 222      * for example if the timebase is 1/90000 and all frames have either
 223      * approximately 3600 or 1800 timer ticks then r_frame_rate will be 50/1
 224      */
 225     AVRational r_frame_rate;
 226     void *priv_data;
 227     /* internal data used in av_find_stream_info() */
 228     int64_t codec_info_duration;
 229     int codec_info_nb_frames;
 230     /* encoding: PTS generation when outputing stream */
 231     AVFrac pts;
 232
 233     /**
 234      * this is the fundamental unit of time (in seconds) in terms
 235      * of which frame timestamps are represented. for fixed-fps content,
 236      * timebase should be 1/framerate and timestamp increments should be
 237      * identically 1.
 238      */
 239     AVRational time_base;
 240     int pts_wrap_bits; /* number of bits in pts (used for wrapping control) */
 241     /* ffmpeg.c private use */
 242     int stream_copy; /* if TRUE, just copy stream */
 243     enum AVDiscard discard; ///< selects which packets can be discarded at will and dont need to be demuxed
 244     //FIXME move stuff to a flags field?
 245     /* quality, as it has been removed from AVCodecContext and put in AVVideoFrame
 246      * MN:dunno if thats the right place, for it */
 247     float quality;
 248     /* decoding: position of the first frame of the component, in
 249        AV_TIME_BASE fractional seconds. */
 250     int64_t start_time;
 251     /* decoding: duration of the stream, in AV_TIME_BASE fractional
 252        seconds. */
 253     int64_t duration;
 254
 255     char language[4]; /* ISO 639 3-letter language code (empty string if undefined) */
 256
 257     /* av_read_frame() support */
 258     int need_parsing;                  ///< 1->full parsing needed, 2->only parse headers dont repack
 259     struct AVCodecParserContext *parser;
 260
 261     int64_t cur_dts;
 262     int last_IP_duration;
 263     int64_t last_IP_pts;
 264     /* av_seek_frame() support */
 265     AVIndexEntry *index_entries; /* only used if the format does not
 266                                     support seeking natively */
 267     int nb_index_entries;
 268     int index_entries_allocated_size;
 269
 270     int64_t nb_frames;                 ///< number of frames in this stream if known or 0
 271 } AVStream;
 272
 273 #define AVFMTCTX_NOHEADER      0x0001 /* signal that no header is present
 274                                          (streams are added dynamically) */
 275
 276 #define MAX_STREAMS 20
 277
 278 /* format I/O context */
 279 typedef struct AVFormatContext {
 280     const AVClass *av_class; /* set by av_alloc_format_context */
 281     /* can only be iformat or oformat, not both at the same time */
 282     struct AVInputFormat *iformat;
 283     struct AVOutputFormat *oformat;
 284     void *priv_data;
 285     ByteIOContext pb;
 286     int nb_streams;
 287     AVStream *streams[MAX_STREAMS];
 288     char filename[1024]; /* input or output filename */
 289     /* stream info */
 290     int64_t timestamp;
 291     char title[512];
 292     char author[512];
 293     char copyright[512];
 294     char comment[512];
 295     char album[512];
 296     int year;  /* ID3 year, 0 if none */
 297     int track; /* track number, 0 if none */
 298     char genre[32]; /* ID3 genre */
 299
 300     int ctx_flags; /* format specific flags, see AVFMTCTX_xx */
 301     /* private data for pts handling (do not modify directly) */
 302     /* This buffer is only needed when packets were already buffered but
 303        not decoded, for example to get the codec parameters in mpeg
 304        streams */
 305     struct AVPacketList *packet_buffer;
 306
 307     /* decoding: position of the first frame of the component, in
 308        AV_TIME_BASE fractional seconds. NEVER set this value directly:
 309        it is deduced from the AVStream values.  */
 310     int64_t start_time;
 311     /* decoding: duration of the stream, in AV_TIME_BASE fractional
 312        seconds. NEVER set this value directly: it is deduced from the
 313        AVStream values.  */
 314     int64_t duration;
 315     /* decoding: total file size. 0 if unknown */
 316     int64_t file_size;
 317     /* decoding: total stream bitrate in bit/s, 0 if not
 318        available. Never set it directly if the file_size and the
 319        duration are known as ffmpeg can compute it automatically. */
 320     int bit_rate;
 321
 322     /* av_read_frame() support */
 323     AVStream *cur_st;
 324     const uint8_t *cur_ptr;
 325     int cur_len;
 326     AVPacket cur_pkt;
 327
 328     /* av_seek_frame() support */
 329     int64_t data_offset; /* offset of the first packet */
 330     int index_built;
 331
 332     int mux_rate;
 333     int packet_size;
 334     int preload;
 335     int max_delay;
 336
 337 #define AVFMT_NOOUTPUTLOOP -1
 338 #define AVFMT_INFINITEOUTPUTLOOP 0
 339     /* number of times to loop output in formats that support it */
 340     int loop_output;
 341
 342     int flags;
 343 #define AVFMT_FLAG_GENPTS       0x0001 ///< generate pts if missing even if it requires parsing future frames
 344 } AVFormatContext;
 345
 346 typedef struct AVPacketList {
 347     AVPacket pkt;
 348     struct AVPacketList *next;
 349 } AVPacketList;
 350
 351 extern AVInputFormat *first_iformat;
 352 extern AVOutputFormat *first_oformat;
 353
 354 /* still image support */
 355 struct AVInputImageContext;
 356 typedef struct AVInputImageContext AVInputImageContext;
 357
 358 typedef struct AVImageInfo {
 359     enum PixelFormat pix_fmt; /* requested pixel format */
 360     int width; /* requested width */
 361     int height; /* requested height */
 362     int interleaved; /* image is interleaved (e.g. interleaved GIF) */
 363     AVPicture pict; /* returned allocated image */
 364 } AVImageInfo;
 365
 366 /* AVImageFormat.flags field constants */
 367 #define AVIMAGE_INTERLEAVED 0x0001 /* image format support interleaved output */
 368
 369 typedef struct AVImageFormat {
 370     const char *name;
 371     const char *extensions;
 372     /* tell if a given file has a chance of being parsing by this format */
 373     int (*img_probe)(AVProbeData *);
 374     /* read a whole image. 'alloc_cb' is called when the image size is
 375        known so that the caller can allocate the image. If 'allo_cb'
 376        returns non zero, then the parsing is aborted. Return '0' if
 377        OK. */
 378     int (*img_read)(ByteIOContext *,
 379                     int (*alloc_cb)(void *, AVImageInfo *info), void *);
 380     /* write the image */
 381     int supported_pixel_formats; /* mask of supported formats for output */
 382     int (*img_write)(ByteIOContext *, AVImageInfo *);
 383     int flags;
 384     struct AVImageFormat *next;
 385 } AVImageFormat;
 386
 387 void av_register_image_format(AVImageFormat *img_fmt);
 388 AVImageFormat *av_probe_image_format(AVProbeData *pd);
 389 AVImageFormat *guess_image_format(const char *filename);
 390 enum CodecID av_guess_image2_codec(const char *filename);
 391 int av_read_image(ByteIOContext *pb, const char *filename,
 392                   AVImageFormat *fmt,
 393                   int (*alloc_cb)(void *, AVImageInfo *info), void *opaque);
 394 int av_write_image(ByteIOContext *pb, AVImageFormat *fmt, AVImageInfo *img);
 395
 396 extern AVImageFormat *first_image_format;
 397
 398 extern AVImageFormat pnm_image_format;
 399 extern AVImageFormat pbm_image_format;
 400 extern AVImageFormat pgm_image_format;
 401 extern AVImageFormat ppm_image_format;
 402 extern AVImageFormat pam_image_format;
 403 extern AVImageFormat pgmyuv_image_format;
 404 extern AVImageFormat yuv_image_format;
 405 #ifdef CONFIG_ZLIB
 406 extern AVImageFormat png_image_format;
 407 #endif
 408 extern AVImageFormat jpeg_image_format;
 409 extern AVImageFormat gif_image_format;
 410 extern AVImageFormat sgi_image_format;
 411
 412 /* XXX: use automatic init with either ELF sections or C file parser */
 413 /* modules */
 414
 415 /* mpeg.c */
 416 extern AVInputFormat mpegps_demux;
 417 int mpegps_init(void);
 418
 419 /* mpegts.c */
 420 extern AVInputFormat mpegts_demux;
 421 int mpegts_init(void);
 422
 423 /* rm.c */
 424 int rm_init(void);
 425
 426 /* crc.c */
 427 int crc_init(void);
 428
 429 /* img.c */
 430 int img_init(void);
 431
 432 /* img2.c */
 433 int img2_init(void);
 434
 435 /* asf.c */
 436 int asf_init(void);
 437
 438 /* avienc.c */
 439 int avienc_init(void);
 440
 441 /* avidec.c */
 442 int avidec_init(void);
 443
 444 /* swf.c */
 445 int swf_init(void);
 446
 447 /* mov.c */
 448 int mov_init(void);
 449
 450 /* movenc.c */
 451 int movenc_init(void);
 452
 453 /* flvenc.c */
 454 int flvenc_init(void);
 455
 456 /* flvdec.c */
 457 int flvdec_init(void);
 458
 459 /* jpeg.c */
 460 int jpeg_init(void);
 461
 462 /* gif.c */
 463 int gif_init(void);
 464
 465 /* au.c */
 466 int au_init(void);
 467
 468 /* amr.c */
 469 int amr_init(void);
 470
 471 /* wav.c */
 472 int ff_wav_init(void);
 473
 474 /* mmf.c */
 475 int ff_mmf_init(void);
 476
 477 /* raw.c */
 478 int pcm_read_seek(AVFormatContext *s,
 479                   int stream_index, int64_t timestamp, int flags);
 480 int raw_init(void);
 481
 482 /* mp3.c */
 483 int mp3_init(void);
 484
 485 /* yuv4mpeg.c */
 486 int yuv4mpeg_init(void);
 487
 488 /* ogg2.c */
 489 int ogg_init(void);
 490
 491 /* ogg.c */
 492 int libogg_init(void);
 493
 494 /* dv.c */
 495 int ff_dv_init(void);
 496
 497 /* ffm.c */
 498 int ffm_init(void);
 499
 500 /* rtsp.c */
 501 extern AVInputFormat redir_demux;
 502 int redir_open(AVFormatContext **ic_ptr, ByteIOContext *f);
 503
 504 /* 4xm.c */
 505 int fourxm_init(void);
 506
 507 /* psxstr.c */
 508 int str_init(void);
 509
 510 /* idroq.c */
 511 int roq_init(void);
 512
 513 /* ipmovie.c */
 514 int ipmovie_init(void);
 515
 516 /* nut.c */
 517 int nut_init(void);
 518
 519 /* wc3movie.c */
 520 int wc3_init(void);
 521
 522 /* westwood.c */
 523 int westwood_init(void);
 524
 525 /* segafilm.c */
 526 int film_init(void);
 527
 528 /* idcin.c */
 529 int idcin_init(void);
 530
 531 /* flic.c */
 532 int flic_init(void);
 533
 534 /* sierravmd.c */
 535 int vmd_init(void);
 536
 537 /* matroska.c */
 538 int matroska_init(void);
 539
 540 /* sol.c */
 541 int sol_init(void);
 542
 543 /* electronicarts.c */
 544 int ea_init(void);
 545
 546 /* nsvdec.c */
 547 int nsvdec_init(void);
 548
 549 /* daud.c */
 550 int daud_init(void);
 551
 552 /* nuv.c */
 553 int nuv_init(void);
 554
 555 /* aiff.c */
 556 int ff_aiff_init(void);
 557
 558 /* voc.c */
 559 int voc_init(void);
 560
 561 /* tta.c */
 562 int tta_init(void);
 563
 564 /* adts.c */
 565 int ff_adts_init(void);
 566
 567 /* mm.c */
 568 int mm_init(void);
 569
 570 /* avs.c */
 571 int avs_init(void);
 572
 573 /* smacker.c */
 574 int smacker_init(void);
 575
 576 #include "rtp.h"
 577
 578 #include "rtsp.h"
 579
 580 /* yuv4mpeg.c */
 581 extern AVOutputFormat yuv4mpegpipe_oformat;
 582
 583 /* utils.c */
 584 void av_register_input_format(AVInputFormat *format);
 585 void av_register_output_format(AVOutputFormat *format);
 586 AVOutputFormat *guess_stream_format(const char *short_name,
 587                                     const char *filename, const char *mime_type);
 588 AVOutputFormat *guess_format(const char *short_name,
 589                              const char *filename, const char *mime_type);
 590 enum CodecID av_guess_codec(AVOutputFormat *fmt, const char *short_name,
 591                             const char *filename, const char *mime_type, enum CodecType type);
 592
 593 void av_hex_dump(FILE *f, uint8_t *buf, int size);
 594 void av_pkt_dump(FILE *f, AVPacket *pkt, int dump_payload);
 595
 596 void av_register_all(void);
 597
 598 typedef struct FifoBuffer {
 599     uint8_t *buffer;
 600     uint8_t *rptr, *wptr, *end;
 601 } FifoBuffer;
 602
 603 int fifo_init(FifoBuffer *f, int size);
 604 void fifo_free(FifoBuffer *f);
 605 int fifo_size(FifoBuffer *f, uint8_t *rptr);
 606 int fifo_read(FifoBuffer *f, uint8_t *buf, int buf_size, uint8_t **rptr_ptr);
 607 void fifo_write(FifoBuffer *f, uint8_t *buf, int size, uint8_t **wptr_ptr);
 608 int put_fifo(ByteIOContext *pb, FifoBuffer *f, int buf_size, uint8_t **rptr_ptr);
 609 void fifo_realloc(FifoBuffer *f, unsigned int size);
 610
 611 /* media file input */
 612 AVInputFormat *av_find_input_format(const char *short_name);
 613 AVInputFormat *av_probe_input_format(AVProbeData *pd, int is_opened);
 614 int av_open_input_stream(AVFormatContext **ic_ptr,
 615                          ByteIOContext *pb, const char *filename,
 616                          AVInputFormat *fmt, AVFormatParameters *ap);
 617 int av_open_input_file(AVFormatContext **ic_ptr, const char *filename,
 618                        AVInputFormat *fmt,
 619                        int buf_size,
 620                        AVFormatParameters *ap);
 621 /* no av_open for output, so applications will need this: */
 622 AVFormatContext *av_alloc_format_context(void);
 623
 624 #define AVERROR_UNKNOWN     (-1)  /* unknown error */
 625 #define AVERROR_IO          (-2)  /* i/o error */
 626 #define AVERROR_NUMEXPECTED (-3)  /* number syntax expected in filename */
 627 #define AVERROR_INVALIDDATA (-4)  /* invalid data found */
 628 #define AVERROR_NOMEM       (-5)  /* not enough memory */
 629 #define AVERROR_NOFMT       (-6)  /* unknown format */
 630 #define AVERROR_NOTSUPP     (-7)  /* operation not supported */
 631
 632 int av_find_stream_info(AVFormatContext *ic);
 633 int av_read_packet(AVFormatContext *s, AVPacket *pkt);
 634 int av_read_frame(AVFormatContext *s, AVPacket *pkt);
 635 int av_seek_frame(AVFormatContext *s, int stream_index, int64_t timestamp, int flags);
 636 int av_read_play(AVFormatContext *s);
 637 int av_read_pause(AVFormatContext *s);
 638 void av_close_input_file(AVFormatContext *s);
 639 AVStream *av_new_stream(AVFormatContext *s, int id);
 640 void av_set_pts_info(AVStream *s, int pts_wrap_bits,
 641                      int pts_num, int pts_den);
 642
 643 #define AVSEEK_FLAG_BACKWARD 1 ///< seek backward
 644 #define AVSEEK_FLAG_BYTE     2 ///< seeking based on position in bytes
 645 #define AVSEEK_FLAG_ANY      4 ///< seek to any frame, even non keyframes
 646
 647 int av_find_default_stream_index(AVFormatContext *s);
 648 int av_index_search_timestamp(AVStream *st, int64_t timestamp, int flags);
 649 int av_add_index_entry(AVStream *st,
 650                        int64_t pos, int64_t timestamp, int size, int distance, int flags);
 651 int av_seek_frame_binary(AVFormatContext *s, int stream_index, int64_t target_ts, int flags);
 652
 653 /* media file output */
 654 int av_set_parameters(AVFormatContext *s, AVFormatParameters *ap);
 655 int av_write_header(AVFormatContext *s);
 656 int av_write_frame(AVFormatContext *s, AVPacket *pkt);
 657 int av_interleaved_write_frame(AVFormatContext *s, AVPacket *pkt);
 658
 659 int av_write_trailer(AVFormatContext *s);
 660
 661 void dump_format(AVFormatContext *ic,
 662                  int index,
 663                  const char *url,
 664                  int is_output);
 665 int parse_image_size(int *width_ptr, int *height_ptr, const char *str);
 666 int parse_frame_rate(int *frame_rate, int *frame_rate_base, const char *arg);
 667 int64_t parse_date(const char *datestr, int duration);
 668
 669 int64_t av_gettime(void);
 670
 671 /* ffm specific for ffserver */
 672 #define FFM_PACKET_SIZE 4096
 673 offset_t ffm_read_write_index(int fd);
 674 void ffm_write_write_index(int fd, offset_t pos);
 675 void ffm_set_write_index(AVFormatContext *s, offset_t pos, offset_t file_size);
 676
 677 int find_info_tag(char *arg, int arg_size, const char *tag1, const char *info);
 678
 679 int get_frame_filename(char *buf, int buf_size,
 680                        const char *path, int number);
 681 int filename_number_test(const char *filename);
 682
 683 /* grab specific */
 684 int video_grab_init(void);
 685 int audio_init(void);
 686
 687 /* DV1394 */
 688 int dv1394_init(void);
 689 int dc1394_init(void);
 690
 691 #ifdef HAVE_AV_CONFIG_H
 692
 693 #include "os_support.h"
 694
 695 int strstart(const char *str, const char *val, const char **ptr);
 696 int stristart(const char *str, const char *val, const char **ptr);
 697 void pstrcpy(char *buf, int buf_size, const char *str);
 698 char *pstrcat(char *buf, int buf_size, const char *s);
 699
 700 void __dynarray_add(unsigned long **tab_ptr, int *nb_ptr, unsigned long elem);
 701
 702 #ifdef __GNUC__
 703 #define dynarray_add(tab, nb_ptr, elem)\
 704 do {\
 705     typeof(tab) _tab = (tab);\
 706     typeof(elem) _elem = (elem);\
 707     (void)sizeof(**_tab == _elem); /* check that types are compatible */\
 708     __dynarray_add((unsigned long **)_tab, nb_ptr, (unsigned long)_elem);\
 709 } while(0)
 710 #else
 711 #define dynarray_add(tab, nb_ptr, elem)\
 712 do {\
 713     __dynarray_add((unsigned long **)(tab), nb_ptr, (unsigned long)(elem));\
 714 } while(0)
 715 #endif
 716
 717 time_t mktimegm(struct tm *tm);
 718 struct tm *brktimegm(time_t secs, struct tm *tm);
 719 const char *small_strptime(const char *p, const char *fmt,
 720                            struct tm *dt);
 721
 722 struct in_addr;
 723 int resolve_host(struct in_addr *sin_addr, const char *hostname);
 724
 725 void url_split(char *proto, int proto_size,
 726                char *authorization, int authorization_size,
 727                char *hostname, int hostname_size,
 728                int *port_ptr,
 729                char *path, int path_size,
 730                const char *url);
 731
 732 int match_ext(const char *filename, const char *extensions);
 733
 734 #endif /* HAVE_AV_CONFIG_H */
 735
 736 #ifdef __cplusplus
 737 }
 738 #endif
 739
 740 #endif /* AVFORMAT_H */
 741