libavformat/avformat.h

   1 #ifndef AVFORMAT_H
   2 #define AVFORMAT_H
   3
   4 #ifdef __cplusplus
   5 extern "C" {
   6 #endif
   7
   8 #define LIBAVFORMAT_BUILD       4616
   9
  10 #define LIBAVFORMAT_VERSION_INT FFMPEG_VERSION_INT
  11 #define LIBAVFORMAT_VERSION     FFMPEG_VERSION
  12 #define LIBAVFORMAT_IDENT       "FFmpeg" FFMPEG_VERSION "b" AV_STRINGIFY(LIBAVFORMAT_BUILD)
  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 AV_TIME_BASE units (or
  32                     pts_den units in muxers or demuxers) */
  33     int64_t dts; /* decompression time stamp in AV_TIME_BASE units (or
  34                     pts_den units in muxers or demuxers) */
  35     uint8_t *data;
  36     int   size;
  37     int   stream_index;
  38     int   flags;
  39     int   duration; /* presentation duration (0 if not available) */
  40     void  (*destruct)(struct AVPacket *);
  41     void  *priv;
  42 } AVPacket;
  43 #define PKT_FLAG_KEY   0x0001
  44
  45 /* initialize optional fields of a packet */
  46 static inline void av_init_packet(AVPacket *pkt)
  47 {
  48     pkt->pts   = AV_NOPTS_VALUE;
  49     pkt->dts   = AV_NOPTS_VALUE;
  50     pkt->duration = 0;
  51     pkt->flags = 0;
  52     pkt->stream_index = 0;
  53 }
  54
  55 int av_new_packet(AVPacket *pkt, int size);
  56 int av_dup_packet(AVPacket *pkt);
  57
  58 /**
  59  * Free a packet
  60  *
  61  * @param pkt packet to free
  62  */
  63 static inline void av_free_packet(AVPacket *pkt)
  64 {
  65     if (pkt && pkt->destruct) {
  66         pkt->destruct(pkt);
  67     }
  68 }
  69
  70 /*************************************************/
  71 /* fractional numbers for exact pts handling */
  72
  73 /* the exact value of the fractional number is: 'val + num / den'. num
  74    is assumed to be such as 0 <= num < den */
  75 typedef struct AVFrac {
  76     int64_t val, num, den;
  77 } AVFrac;
  78
  79 void av_frac_init(AVFrac *f, int64_t val, int64_t num, int64_t den);
  80 void av_frac_add(AVFrac *f, int64_t incr);
  81 void av_frac_set(AVFrac *f, int64_t val);
  82
  83 /*************************************************/
  84 /* input/output formats */
  85
  86 struct AVFormatContext;
  87
  88 /* this structure contains the data a format has to probe a file */
  89 typedef struct AVProbeData {
  90     const char *filename;
  91     unsigned char *buf;
  92     int buf_size;
  93 } AVProbeData;
  94
  95 #define AVPROBE_SCORE_MAX 100
  96
  97 typedef struct AVFormatParameters {
  98     int frame_rate;
  99     int frame_rate_base;
 100     int sample_rate;
 101     int channels;
 102     int width;
 103     int height;
 104     enum PixelFormat pix_fmt;
 105     struct AVImageFormat *image_format;
 106     int channel; /* used to select dv channel */
 107     const char *device; /* video4linux, audio or DV device */
 108     const char *standard; /* tv standard, NTSC, PAL, SECAM */
 109     int mpeg2ts_raw:1;  /* force raw MPEG2 transport stream output, if possible */
 110     int mpeg2ts_compute_pcr:1; /* compute exact PCR for each transport
 111                                   stream packet (only meaningful if
 112                                   mpeg2ts_raw is TRUE */
 113     int initial_pause:1;       /* do not begin to play the stream
 114                                   immediately (RTSP only) */
 115 } AVFormatParameters;
 116
 117 #define AVFMT_NOFILE        0x0001 /* no file should be opened */
 118 #define AVFMT_NEEDNUMBER    0x0002 /* needs '%d' in filename */
 119 #define AVFMT_SHOW_IDS      0x0008 /* show format stream IDs numbers */
 120 #define AVFMT_RAWPICTURE    0x0020 /* format wants AVPicture structure for
 121                                       raw picture data */
 122
 123 typedef struct AVOutputFormat {
 124     const char *name;
 125     const char *long_name;
 126     const char *mime_type;
 127     const char *extensions; /* comma separated extensions */
 128     /* size of private data so that it can be allocated in the wrapper */
 129     int priv_data_size;
 130     /* output support */
 131     enum CodecID audio_codec; /* default audio codec */
 132     enum CodecID video_codec; /* default video codec */
 133     int (*write_header)(struct AVFormatContext *);
 134     int (*write_packet)(struct AVFormatContext *, AVPacket *pkt);
 135     int (*write_trailer)(struct AVFormatContext *);
 136     /* can use flags: AVFMT_NOFILE, AVFMT_NEEDNUMBER */
 137     int flags;
 138     /* currently only used to set pixel format if not YUV420P */
 139     int (*set_parameters)(struct AVFormatContext *, AVFormatParameters *);
 140     /* private fields */
 141     struct AVOutputFormat *next;
 142 } AVOutputFormat;
 143
 144 typedef struct AVInputFormat {
 145     const char *name;
 146     const char *long_name;
 147     /* size of private data so that it can be allocated in the wrapper */
 148     int priv_data_size;
 149     /* tell if a given file has a chance of being parsing by this format */
 150     int (*read_probe)(AVProbeData *);
 151     /* read the format header and initialize the AVFormatContext
 152        structure. Return 0 if OK. 'ap' if non NULL contains
 153        additionnal paramters. Only used in raw format right
 154        now. 'av_new_stream' should be called to create new streams.  */
 155     int (*read_header)(struct AVFormatContext *,
 156                        AVFormatParameters *ap);
 157     /* read one packet and put it in 'pkt'. pts and flags are also
 158        set. 'av_new_stream' can be called only if the flag
 159        AVFMTCTX_NOHEADER is used. */
 160     int (*read_packet)(struct AVFormatContext *, AVPacket *pkt);
 161     /* close the stream. The AVFormatContext and AVStreams are not
 162        freed by this function */
 163     int (*read_close)(struct AVFormatContext *);
 164     /* seek at or before a given timestamp (given in AV_TIME_BASE
 165        units) relative to the frames in stream component stream_index */
 166     int (*read_seek)(struct AVFormatContext *,
 167                      int stream_index, int64_t timestamp);
 168     /**
 169      * gets the next timestamp in AV_TIME_BASE units.
 170      */
 171     int64_t (*read_timestamp)(struct AVFormatContext *s, int stream_index,
 172                               int64_t *pos, int64_t pos_limit);
 173     /* can use flags: AVFMT_NOFILE, AVFMT_NEEDNUMBER */
 174     int flags;
 175     /* if extensions are defined, then no probe is done. You should
 176        usually not use extension format guessing because it is not
 177        reliable enough */
 178     const char *extensions;
 179     /* general purpose read only value that the format can use */
 180     int value;
 181
 182     /* start/resume playing - only meaningful if using a network based format
 183        (RTSP) */
 184     int (*read_play)(struct AVFormatContext *);
 185
 186     /* pause playing - only meaningful if using a network based format
 187        (RTSP) */
 188     int (*read_pause)(struct AVFormatContext *);
 189
 190     /* private fields */
 191     struct AVInputFormat *next;
 192 } AVInputFormat;
 193
 194 typedef struct AVIndexEntry {
 195     int64_t pos;
 196     int64_t timestamp;
 197 #define AVINDEX_KEYFRAME 0x0001
 198 /* the following 2 flags indicate that the next/prev keyframe is known, and scaning for it isnt needed */
 199     int flags;
 200     int min_distance;         /* min distance between this and the previous keyframe, used to avoid unneeded searching */
 201 } AVIndexEntry;
 202
 203 typedef struct AVStream {
 204     int index;    /* stream index in AVFormatContext */
 205     int id;       /* format specific stream id */
 206     AVCodecContext codec; /* codec context */
 207     int r_frame_rate;     /* real frame rate of the stream */
 208     int r_frame_rate_base;/* real frame rate base of the stream */
 209     void *priv_data;
 210     /* internal data used in av_find_stream_info() */
 211     int64_t codec_info_duration;
 212     int codec_info_nb_frames;
 213     /* encoding: PTS generation when outputing stream */
 214     AVFrac pts;
 215     AVRational time_base;
 216     int pts_wrap_bits; /* number of bits in pts (used for wrapping control) */
 217     /* ffmpeg.c private use */
 218     int stream_copy; /* if TRUE, just copy stream */
 219     /* quality, as it has been removed from AVCodecContext and put in AVVideoFrame
 220      * MN:dunno if thats the right place, for it */
 221     float quality;
 222     /* decoding: position of the first frame of the component, in
 223        AV_TIME_BASE fractional seconds. */
 224     int64_t start_time;
 225     /* decoding: duration of the stream, in AV_TIME_BASE fractional
 226        seconds. */
 227     int64_t duration;
 228
 229     /* av_read_frame() support */
 230     int need_parsing;
 231     struct AVCodecParserContext *parser;
 232
 233     int64_t cur_dts;
 234     int last_IP_duration;
 235     int64_t last_IP_pts;
 236     /* av_seek_frame() support */
 237     AVIndexEntry *index_entries; /* only used if the format does not
 238                                     support seeking natively */
 239     int nb_index_entries;
 240     int index_entries_allocated_size;
 241 } AVStream;
 242
 243 #define AVFMTCTX_NOHEADER      0x0001 /* signal that no header is present
 244                                          (streams are added dynamically) */
 245
 246 #define MAX_STREAMS 20
 247
 248 /* format I/O context */
 249 typedef struct AVFormatContext {
 250     AVClass *av_class; /* set by av_alloc_format_context */
 251     /* can only be iformat or oformat, not both at the same time */
 252     struct AVInputFormat *iformat;
 253     struct AVOutputFormat *oformat;
 254     void *priv_data;
 255     ByteIOContext pb;
 256     int nb_streams;
 257     AVStream *streams[MAX_STREAMS];
 258     char filename[1024]; /* input or output filename */
 259     /* stream info */
 260     int64_t timestamp;
 261     char title[512];
 262     char author[512];
 263     char copyright[512];
 264     char comment[512];
 265     char album[512];
 266     int year;  /* ID3 year, 0 if none */
 267     int track; /* track number, 0 if none */
 268     char genre[32]; /* ID3 genre */
 269
 270     int ctx_flags; /* format specific flags, see AVFMTCTX_xx */
 271     /* private data for pts handling (do not modify directly) */
 272     /* This buffer is only needed when packets were already buffered but
 273        not decoded, for example to get the codec parameters in mpeg
 274        streams */
 275     struct AVPacketList *packet_buffer;
 276
 277     /* decoding: position of the first frame of the component, in
 278        AV_TIME_BASE fractional seconds. NEVER set this value directly:
 279        it is deduced from the AVStream values.  */
 280     int64_t start_time;
 281     /* decoding: duration of the stream, in AV_TIME_BASE fractional
 282        seconds. NEVER set this value directly: it is deduced from the
 283        AVStream values.  */
 284     int64_t duration;
 285     /* decoding: total file size. 0 if unknown */
 286     int64_t file_size;
 287     /* decoding: total stream bitrate in bit/s, 0 if not
 288        available. Never set it directly if the file_size and the
 289        duration are known as ffmpeg can compute it automatically. */
 290     int bit_rate;
 291
 292     /* av_read_frame() support */
 293     AVStream *cur_st;
 294     const uint8_t *cur_ptr;
 295     int cur_len;
 296     AVPacket cur_pkt;
 297
 298     /* av_seek_frame() support */
 299     int64_t data_offset; /* offset of the first packet */
 300     int index_built;
 301 } AVFormatContext;
 302
 303 typedef struct AVPacketList {
 304     AVPacket pkt;
 305     struct AVPacketList *next;
 306 } AVPacketList;
 307
 308 extern AVInputFormat *first_iformat;
 309 extern AVOutputFormat *first_oformat;
 310
 311 /* still image support */
 312 struct AVInputImageContext;
 313 typedef struct AVInputImageContext AVInputImageContext;
 314
 315 typedef struct AVImageInfo {
 316     enum PixelFormat pix_fmt; /* requested pixel format */
 317     int width; /* requested width */
 318     int height; /* requested height */
 319     int interleaved; /* image is interleaved (e.g. interleaved GIF) */
 320     AVPicture pict; /* returned allocated image */
 321 } AVImageInfo;
 322
 323 /* AVImageFormat.flags field constants */
 324 #define AVIMAGE_INTERLEAVED 0x0001 /* image format support interleaved output */
 325
 326 typedef struct AVImageFormat {
 327     const char *name;
 328     const char *extensions;
 329     /* tell if a given file has a chance of being parsing by this format */
 330     int (*img_probe)(AVProbeData *);
 331     /* read a whole image. 'alloc_cb' is called when the image size is
 332        known so that the caller can allocate the image. If 'allo_cb'
 333        returns non zero, then the parsing is aborted. Return '0' if
 334        OK. */
 335     int (*img_read)(ByteIOContext *,
 336                     int (*alloc_cb)(void *, AVImageInfo *info), void *);
 337     /* write the image */
 338     int supported_pixel_formats; /* mask of supported formats for output */
 339     int (*img_write)(ByteIOContext *, AVImageInfo *);
 340     int flags;
 341     struct AVImageFormat *next;
 342 } AVImageFormat;
 343
 344 void av_register_image_format(AVImageFormat *img_fmt);
 345 AVImageFormat *av_probe_image_format(AVProbeData *pd);
 346 AVImageFormat *guess_image_format(const char *filename);
 347 int av_read_image(ByteIOContext *pb, const char *filename,
 348                   AVImageFormat *fmt,
 349                   int (*alloc_cb)(void *, AVImageInfo *info), void *opaque);
 350 int av_write_image(ByteIOContext *pb, AVImageFormat *fmt, AVImageInfo *img);
 351
 352 extern AVImageFormat *first_image_format;
 353
 354 extern AVImageFormat pnm_image_format;
 355 extern AVImageFormat pbm_image_format;
 356 extern AVImageFormat pgm_image_format;
 357 extern AVImageFormat ppm_image_format;
 358 extern AVImageFormat pam_image_format;
 359 extern AVImageFormat pgmyuv_image_format;
 360 extern AVImageFormat yuv_image_format;
 361 #ifdef CONFIG_ZLIB
 362 extern AVImageFormat png_image_format;
 363 #endif
 364 extern AVImageFormat jpeg_image_format;
 365 extern AVImageFormat gif_image_format;
 366 extern AVImageFormat sgi_image_format;
 367
 368 /* XXX: use automatic init with either ELF sections or C file parser */
 369 /* modules */
 370
 371 /* mpeg.c */
 372 extern AVInputFormat mpegps_demux;
 373 int mpegps_init(void);
 374
 375 /* mpegts.c */
 376 extern AVInputFormat mpegts_demux;
 377 int mpegts_init(void);
 378
 379 /* rm.c */
 380 int rm_init(void);
 381
 382 /* crc.c */
 383 int crc_init(void);
 384
 385 /* img.c */
 386 int img_init(void);
 387
 388 /* img2.c */
 389 int img2_init(void);
 390
 391 /* asf.c */
 392 int asf_init(void);
 393
 394 /* avienc.c */
 395 int avienc_init(void);
 396
 397 /* avidec.c */
 398 int avidec_init(void);
 399
 400 /* swf.c */
 401 int swf_init(void);
 402
 403 /* mov.c */
 404 int mov_init(void);
 405
 406 /* movenc.c */
 407 int movenc_init(void);
 408
 409 /* flvenc.c */
 410 int flvenc_init(void);
 411
 412 /* flvdec.c */
 413 int flvdec_init(void);
 414
 415 /* jpeg.c */
 416 int jpeg_init(void);
 417
 418 /* gif.c */
 419 int gif_init(void);
 420
 421 /* au.c */
 422 int au_init(void);
 423
 424 /* amr.c */
 425 int amr_init(void);
 426
 427 /* wav.c */
 428 int ff_wav_init(void);
 429
 430 /* raw.c */
 431 int pcm_read_seek(AVFormatContext *s,
 432                   int stream_index, int64_t timestamp);
 433 int raw_init(void);
 434
 435 /* mp3.c */
 436 int mp3_init(void);
 437
 438 /* yuv4mpeg.c */
 439 int yuv4mpeg_init(void);
 440
 441 /* ogg.c */
 442 int ogg_init(void);
 443
 444 /* dv.c */
 445 int ff_dv_init(void);
 446
 447 /* ffm.c */
 448 int ffm_init(void);
 449
 450 /* rtsp.c */
 451 extern AVInputFormat redir_demux;
 452 int redir_open(AVFormatContext **ic_ptr, ByteIOContext *f);
 453
 454 /* 4xm.c */
 455 int fourxm_init(void);
 456
 457 /* psxstr.c */
 458 int str_init(void);
 459
 460 /* idroq.c */
 461 int roq_init(void);
 462
 463 /* ipmovie.c */
 464 int ipmovie_init(void);
 465
 466 /* nut.c */
 467 int nut_init(void);
 468
 469 /* wc3movie.c */
 470 int wc3_init(void);
 471
 472 /* westwood.c */
 473 int westwood_init(void);
 474
 475 /* segafilm.c */
 476 int film_init(void);
 477
 478 /* idcin.c */
 479 int idcin_init(void);
 480
 481 /* flic.c */
 482 int flic_init(void);
 483
 484 /* sierravmd.c */
 485 int vmd_init(void);
 486
 487 /* matroska.c */
 488 int matroska_init(void);
 489
 490 #include "rtp.h"
 491
 492 #include "rtsp.h"
 493
 494 /* yuv4mpeg.c */
 495 extern AVOutputFormat yuv4mpegpipe_oformat;
 496
 497 /* utils.c */
 498 void av_register_input_format(AVInputFormat *format);
 499 void av_register_output_format(AVOutputFormat *format);
 500 AVOutputFormat *guess_stream_format(const char *short_name,
 501                                     const char *filename, const char *mime_type);
 502 AVOutputFormat *guess_format(const char *short_name,
 503                              const char *filename, const char *mime_type);
 504
 505 void av_hex_dump(FILE *f, uint8_t *buf, int size);
 506 void av_pkt_dump(FILE *f, AVPacket *pkt, int dump_payload);
 507
 508 void av_register_all(void);
 509
 510 typedef struct FifoBuffer {
 511     uint8_t *buffer;
 512     uint8_t *rptr, *wptr, *end;
 513 } FifoBuffer;
 514
 515 int fifo_init(FifoBuffer *f, int size);
 516 void fifo_free(FifoBuffer *f);
 517 int fifo_size(FifoBuffer *f, uint8_t *rptr);
 518 int fifo_read(FifoBuffer *f, uint8_t *buf, int buf_size, uint8_t **rptr_ptr);
 519 void fifo_write(FifoBuffer *f, uint8_t *buf, int size, uint8_t **wptr_ptr);
 520
 521 /* media file input */
 522 AVInputFormat *av_find_input_format(const char *short_name);
 523 AVInputFormat *av_probe_input_format(AVProbeData *pd, int is_opened);
 524 int av_open_input_stream(AVFormatContext **ic_ptr,
 525                          ByteIOContext *pb, const char *filename,
 526                          AVInputFormat *fmt, AVFormatParameters *ap);
 527 int av_open_input_file(AVFormatContext **ic_ptr, const char *filename,
 528                        AVInputFormat *fmt,
 529                        int buf_size,
 530                        AVFormatParameters *ap);
 531 /* no av_open for output, so applications will need this: */
 532 AVFormatContext *av_alloc_format_context(void);
 533
 534 #define AVERROR_UNKNOWN     (-1)  /* unknown error */
 535 #define AVERROR_IO          (-2)  /* i/o error */
 536 #define AVERROR_NUMEXPECTED (-3)  /* number syntax expected in filename */
 537 #define AVERROR_INVALIDDATA (-4)  /* invalid data found */
 538 #define AVERROR_NOMEM       (-5)  /* not enough memory */
 539 #define AVERROR_NOFMT       (-6)  /* unknown format */
 540 #define AVERROR_NOTSUPP     (-7)  /* operation not supported */
 541
 542 int av_find_stream_info(AVFormatContext *ic);
 543 int av_read_packet(AVFormatContext *s, AVPacket *pkt);
 544 int av_read_frame(AVFormatContext *s, AVPacket *pkt);
 545 int av_seek_frame(AVFormatContext *s, int stream_index, int64_t timestamp);
 546 int av_read_play(AVFormatContext *s);
 547 int av_read_pause(AVFormatContext *s);
 548 void av_close_input_file(AVFormatContext *s);
 549 AVStream *av_new_stream(AVFormatContext *s, int id);
 550 void av_set_pts_info(AVStream *s, int pts_wrap_bits,
 551                      int pts_num, int pts_den);
 552
 553 int av_find_default_stream_index(AVFormatContext *s);
 554 int av_index_search_timestamp(AVStream *st, int timestamp);
 555 int av_add_index_entry(AVStream *st,
 556                        int64_t pos, int64_t timestamp, int distance, int flags);
 557 int av_seek_frame_binary(AVFormatContext *s, int stream_index, int64_t target_ts);
 558
 559 /* media file output */
 560 int av_set_parameters(AVFormatContext *s, AVFormatParameters *ap);
 561 int av_write_header(AVFormatContext *s);
 562 int av_write_frame(AVFormatContext *s, AVPacket *pkt);
 563 int av_interleaved_write_frame(AVFormatContext *s, AVPacket *pkt);
 564
 565 int av_write_trailer(AVFormatContext *s);
 566
 567 void dump_format(AVFormatContext *ic,
 568                  int index,
 569                  const char *url,
 570                  int is_output);
 571 int parse_image_size(int *width_ptr, int *height_ptr, const char *str);
 572 int parse_frame_rate(int *frame_rate, int *frame_rate_base, const char *arg);
 573 int64_t parse_date(const char *datestr, int duration);
 574
 575 int64_t av_gettime(void);
 576
 577 /* ffm specific for ffserver */
 578 #define FFM_PACKET_SIZE 4096
 579 offset_t ffm_read_write_index(int fd);
 580 void ffm_write_write_index(int fd, offset_t pos);
 581 void ffm_set_write_index(AVFormatContext *s, offset_t pos, offset_t file_size);
 582
 583 int find_info_tag(char *arg, int arg_size, const char *tag1, const char *info);
 584
 585 int get_frame_filename(char *buf, int buf_size,
 586                        const char *path, int number);
 587 int filename_number_test(const char *filename);
 588
 589 /* grab specific */
 590 int video_grab_init(void);
 591 int audio_init(void);
 592
 593 /* DV1394 */
 594 int dv1394_init(void);
 595
 596 #ifdef HAVE_AV_CONFIG_H
 597
 598 #include "os_support.h"
 599
 600 int strstart(const char *str, const char *val, const char **ptr);
 601 int stristart(const char *str, const char *val, const char **ptr);
 602 void pstrcpy(char *buf, int buf_size, const char *str);
 603 char *pstrcat(char *buf, int buf_size, const char *s);
 604
 605 void __dynarray_add(unsigned long **tab_ptr, int *nb_ptr, unsigned long elem);
 606
 607 #ifdef __GNUC__
 608 #define dynarray_add(tab, nb_ptr, elem)\
 609 do {\
 610     typeof(tab) _tab = (tab);\
 611     typeof(elem) _elem = (elem);\
 612     (void)sizeof(**_tab == _elem); /* check that types are compatible */\
 613     __dynarray_add((unsigned long **)_tab, nb_ptr, (unsigned long)_elem);\
 614 } while(0)
 615 #else
 616 #define dynarray_add(tab, nb_ptr, elem)\
 617 do {\
 618     __dynarray_add((unsigned long **)(tab), nb_ptr, (unsigned long)(elem));\
 619 } while(0)
 620 #endif
 621
 622 time_t mktimegm(struct tm *tm);
 623 const char *small_strptime(const char *p, const char *fmt,
 624                            struct tm *dt);
 625
 626 struct in_addr;
 627 int resolve_host(struct in_addr *sin_addr, const char *hostname);
 628
 629 void url_split(char *proto, int proto_size,
 630                char *authorization, int authorization_size,
 631                char *hostname, int hostname_size,
 632                int *port_ptr,
 633                char *path, int path_size,
 634                const char *url);
 635
 636 int match_ext(const char *filename, const char *extensions);
 637
 638 #endif /* HAVE_AV_CONFIG_H */
 639
 640 #ifdef __cplusplus
 641 }
 642 #endif
 643
 644 #endif /* AVFORMAT_H */