2 * copyright (c) 2001 Fabrice Bellard
4 * This file is part of FFmpeg.
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.
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.
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
28 #define LIBAVFORMAT_VERSION_INT ((51<<16)+(10<<8)+0)
29 #define LIBAVFORMAT_VERSION 51.10.0
30 #define LIBAVFORMAT_BUILD LIBAVFORMAT_VERSION_INT
32 #define LIBAVFORMAT_IDENT "Lavf" AV_STRINGIFY(LIBAVFORMAT_VERSION)
35 #include <stdio.h> /* FILE */
40 /* packet functions */
42 typedef struct AVPacket {
43 int64_t pts; ///< presentation time stamp in time_base units
44 int64_t dts; ///< decompression time stamp in time_base units
49 int duration; ///< presentation duration in time_base units (0 if not available)
50 void (*destruct)(struct AVPacket *);
52 int64_t pos; ///< byte position in stream, -1 if unknown
54 #define PKT_FLAG_KEY 0x0001
56 void av_destruct_packet_nofree(AVPacket *pkt);
59 * Default packet destructor.
61 void av_destruct_packet(AVPacket *pkt);
63 /* initialize optional fields of a packet */
64 static inline void av_init_packet(AVPacket *pkt)
66 pkt->pts = AV_NOPTS_VALUE;
67 pkt->dts = AV_NOPTS_VALUE;
71 pkt->stream_index = 0;
72 pkt->destruct= av_destruct_packet_nofree;
76 * Allocate the payload of a packet and intialized its fields to default values.
79 * @param size wanted payload size
80 * @return 0 if OK. AVERROR_xxx otherwise.
82 int av_new_packet(AVPacket *pkt, int size);
85 * Allocate and read the payload of a packet and intialized its fields to default values.
88 * @param size wanted payload size
89 * @return >0 (read size) if OK. AVERROR_xxx otherwise.
91 int av_get_packet(ByteIOContext *s, AVPacket *pkt, int size);
94 * @warning This is a hack - the packet memory allocation stuff is broken. The
95 * packet is allocated if it was not really allocated
97 int av_dup_packet(AVPacket *pkt);
102 * @param pkt packet to free
104 static inline void av_free_packet(AVPacket *pkt)
106 if (pkt && pkt->destruct) {
111 /*************************************************/
112 /* fractional numbers for exact pts handling */
114 /* the exact value of the fractional number is: 'val + num / den'. num
115 is assumed to be such as 0 <= num < den */
116 typedef struct AVFrac {
117 int64_t val, num, den;
118 } AVFrac attribute_deprecated;
120 /*************************************************/
121 /* input/output formats */
125 struct AVFormatContext;
127 /** this structure contains the data a format has to probe a file */
128 typedef struct AVProbeData {
129 const char *filename;
134 #define AVPROBE_SCORE_MAX 100 ///< max score, half of that is used for file extension based detection
136 typedef struct AVFormatParameters {
137 AVRational time_base;
142 enum PixelFormat pix_fmt;
143 int channel; /**< used to select dv channel */
144 #if LIBAVFORMAT_VERSION_INT < (52<<16)
145 const char *device; /**< video, audio or DV device */
147 const char *standard; /**< tv standard, NTSC, PAL, SECAM */
148 int mpeg2ts_raw:1; /**< force raw MPEG2 transport stream output, if possible */
149 int mpeg2ts_compute_pcr:1; /**< compute exact PCR for each transport
150 stream packet (only meaningful if
151 mpeg2ts_raw is TRUE */
152 int initial_pause:1; /**< do not begin to play the stream
153 immediately (RTSP only) */
154 int prealloced_context:1;
155 enum CodecID video_codec_id;
156 enum CodecID audio_codec_id;
157 } AVFormatParameters;
159 //! demuxer will use url_fopen, no opened file should be provided by the caller
160 #define AVFMT_NOFILE 0x0001
161 #define AVFMT_NEEDNUMBER 0x0002 /**< needs '%d' in filename */
162 #define AVFMT_SHOW_IDS 0x0008 /**< show format stream IDs numbers */
163 #define AVFMT_RAWPICTURE 0x0020 /**< format wants AVPicture structure for
165 #define AVFMT_GLOBALHEADER 0x0040 /**< format wants global header */
166 #define AVFMT_NOTIMESTAMPS 0x0080 /**< format doesnt need / has any timestamps */
167 #define AVFMT_GENERIC_INDEX 0x0100 /**< use generic index building code */
169 typedef struct AVOutputFormat {
171 const char *long_name;
172 const char *mime_type;
173 const char *extensions; /**< comma separated extensions */
174 /** size of private data so that it can be allocated in the wrapper */
177 enum CodecID audio_codec; /**< default audio codec */
178 enum CodecID video_codec; /**< default video codec */
179 int (*write_header)(struct AVFormatContext *);
180 int (*write_packet)(struct AVFormatContext *, AVPacket *pkt);
181 int (*write_trailer)(struct AVFormatContext *);
182 /** can use flags: AVFMT_NOFILE, AVFMT_NEEDNUMBER, AVFMT_GLOBALHEADER */
184 /** currently only used to set pixel format if not YUV420P */
185 int (*set_parameters)(struct AVFormatContext *, AVFormatParameters *);
186 int (*interleave_packet)(struct AVFormatContext *, AVPacket *out, AVPacket *in, int flush);
189 * list of supported codec_id-codec_tag pairs, ordered by "better choice first"
190 * the arrays are all CODEC_ID_NONE terminated
192 const struct AVCodecTag **codec_tag;
195 struct AVOutputFormat *next;
198 typedef struct AVInputFormat {
200 const char *long_name;
201 /** size of private data so that it can be allocated in the wrapper */
203 /** tell if a given file has a chance of being parsing by this format */
204 int (*read_probe)(AVProbeData *);
205 /** read the format header and initialize the AVFormatContext
206 structure. Return 0 if OK. 'ap' if non NULL contains
207 additionnal paramters. Only used in raw format right
208 now. 'av_new_stream' should be called to create new streams. */
209 int (*read_header)(struct AVFormatContext *,
210 AVFormatParameters *ap);
211 /** read one packet and put it in 'pkt'. pts and flags are also
212 set. 'av_new_stream' can be called only if the flag
213 AVFMTCTX_NOHEADER is used. */
214 int (*read_packet)(struct AVFormatContext *, AVPacket *pkt);
215 /** close the stream. The AVFormatContext and AVStreams are not
216 freed by this function */
217 int (*read_close)(struct AVFormatContext *);
219 * seek to a given timestamp relative to the frames in
220 * stream component stream_index
221 * @param stream_index must not be -1
222 * @param flags selects which direction should be preferred if no exact
225 int (*read_seek)(struct AVFormatContext *,
226 int stream_index, int64_t timestamp, int flags);
228 * gets the next timestamp in AV_TIME_BASE units.
230 int64_t (*read_timestamp)(struct AVFormatContext *s, int stream_index,
231 int64_t *pos, int64_t pos_limit);
232 /** can use flags: AVFMT_NOFILE, AVFMT_NEEDNUMBER */
234 /** if extensions are defined, then no probe is done. You should
235 usually not use extension format guessing because it is not
237 const char *extensions;
238 /** general purpose read only value that the format can use */
241 /** start/resume playing - only meaningful if using a network based format
243 int (*read_play)(struct AVFormatContext *);
245 /** pause playing - only meaningful if using a network based format
247 int (*read_pause)(struct AVFormatContext *);
249 const struct AVCodecTag **codec_tag;
252 struct AVInputFormat *next;
255 typedef struct AVIndexEntry {
258 #define AVINDEX_KEYFRAME 0x0001
260 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)
261 int min_distance; /**< min distance between this and the previous keyframe, used to avoid unneeded searching */
264 typedef struct AVStream {
265 int index; /**< stream index in AVFormatContext */
266 int id; /**< format specific stream id */
267 AVCodecContext *codec; /**< codec context */
269 * real base frame rate of the stream.
270 * this is the lowest framerate with which all timestamps can be
271 * represented accurately (its the least common multiple of all
272 * framerates in the stream), Note, this value is just a guess!
273 * for example if the timebase is 1/90000 and all frames have either
274 * approximately 3600 or 1800 timer ticks then r_frame_rate will be 50/1
276 AVRational r_frame_rate;
278 /* internal data used in av_find_stream_info() */
279 int64_t codec_info_duration;
280 int codec_info_nb_frames;
281 /** encoding: PTS generation when outputing stream */
285 * this is the fundamental unit of time (in seconds) in terms
286 * of which frame timestamps are represented. for fixed-fps content,
287 * timebase should be 1/framerate and timestamp increments should be
290 AVRational time_base;
291 int pts_wrap_bits; /**< number of bits in pts (used for wrapping control) */
292 /* ffmpeg.c private use */
293 int stream_copy; /* *<if TRUE, just copy stream */
294 enum AVDiscard discard; ///< selects which packets can be discarded at will and dont need to be demuxed
295 //FIXME move stuff to a flags field?
296 /** quality, as it has been removed from AVCodecContext and put in AVVideoFrame
297 * MN:dunno if thats the right place, for it */
299 /** decoding: position of the first frame of the component, in
300 AV_TIME_BASE fractional seconds. */
302 /** decoding: duration of the stream, in AV_TIME_BASE fractional
306 char language[4]; /** ISO 639 3-letter language code (empty string if undefined) */
308 /* av_read_frame() support */
309 int need_parsing; ///< 1->full parsing needed, 2->only parse headers dont repack
310 struct AVCodecParserContext *parser;
313 int last_IP_duration;
315 /* av_seek_frame() support */
316 AVIndexEntry *index_entries; /**< only used if the format does not
317 support seeking natively */
318 int nb_index_entries;
319 unsigned int index_entries_allocated_size;
321 int64_t nb_frames; ///< number of frames in this stream if known or 0
323 #define MAX_REORDER_DELAY 4
324 int64_t pts_buffer[MAX_REORDER_DELAY+1];
327 #define AVFMTCTX_NOHEADER 0x0001 /**< signal that no header is present
328 (streams are added dynamically) */
330 #define MAX_STREAMS 20
332 /* format I/O context */
333 typedef struct AVFormatContext {
334 const AVClass *av_class; /**< set by av_alloc_format_context */
335 /* can only be iformat or oformat, not both at the same time */
336 struct AVInputFormat *iformat;
337 struct AVOutputFormat *oformat;
340 unsigned int nb_streams;
341 AVStream *streams[MAX_STREAMS];
342 char filename[1024]; /**< input or output filename */
350 int year; /**< ID3 year, 0 if none */
351 int track; /**< track number, 0 if none */
352 char genre[32]; /**< ID3 genre */
354 int ctx_flags; /**< format specific flags, see AVFMTCTX_xx */
355 /* private data for pts handling (do not modify directly) */
356 /** This buffer is only needed when packets were already buffered but
357 not decoded, for example to get the codec parameters in mpeg
359 struct AVPacketList *packet_buffer;
361 /** decoding: position of the first frame of the component, in
362 AV_TIME_BASE fractional seconds. NEVER set this value directly:
363 it is deduced from the AVStream values. */
365 /** decoding: duration of the stream, in AV_TIME_BASE fractional
366 seconds. NEVER set this value directly: it is deduced from the
369 /** decoding: total file size. 0 if unknown */
371 /** decoding: total stream bitrate in bit/s, 0 if not
372 available. Never set it directly if the file_size and the
373 duration are known as ffmpeg can compute it automatically. */
376 /* av_read_frame() support */
378 const uint8_t *cur_ptr;
382 /* av_seek_frame() support */
383 int64_t data_offset; /** offset of the first packet */
391 #define AVFMT_NOOUTPUTLOOP -1
392 #define AVFMT_INFINITEOUTPUTLOOP 0
393 /** number of times to loop output in formats that support it */
397 #define AVFMT_FLAG_GENPTS 0x0001 ///< generate pts if missing even if it requires parsing future frames
398 #define AVFMT_FLAG_IGNIDX 0x0002 ///< ignore index
401 /** decoding: size of data to probe; encoding unused */
402 unsigned int probesize;
405 * maximum duration in AV_TIME_BASE units over which the input should be analyzed in av_find_stream_info()
407 int max_analyze_duration;
413 typedef struct AVPacketList {
415 struct AVPacketList *next;
418 extern AVInputFormat *first_iformat;
419 extern AVOutputFormat *first_oformat;
421 enum CodecID av_guess_image2_codec(const char *filename);
423 /* XXX: use automatic init with either ELF sections or C file parser */
431 void av_register_input_format(AVInputFormat *format);
432 void av_register_output_format(AVOutputFormat *format);
433 AVOutputFormat *guess_stream_format(const char *short_name,
434 const char *filename, const char *mime_type);
435 AVOutputFormat *guess_format(const char *short_name,
436 const char *filename, const char *mime_type);
439 * Guesses the codec id based upon muxer and filename.
441 enum CodecID av_guess_codec(AVOutputFormat *fmt, const char *short_name,
442 const char *filename, const char *mime_type, enum CodecType type);
445 * Print nice hexa dump of a buffer
446 * @param f stream for output
448 * @param size buffer size
450 void av_hex_dump(FILE *f, uint8_t *buf, int size);
453 * Print on 'f' a nice dump of a packet
454 * @param f stream for output
455 * @param pkt packet to dump
456 * @param dump_payload true if the payload must be displayed too
458 void av_pkt_dump(FILE *f, AVPacket *pkt, int dump_payload);
460 void av_register_all(void);
462 /** codec tag <-> codec id */
463 enum CodecID av_codec_get_id(const struct AVCodecTag **tags, unsigned int tag);
464 unsigned int av_codec_get_tag(const struct AVCodecTag **tags, enum CodecID id);
466 /* media file input */
469 * finds AVInputFormat based on input format's short name.
471 AVInputFormat *av_find_input_format(const char *short_name);
476 * @param is_opened whether the file is already opened, determines whether
477 * demuxers with or without AVFMT_NOFILE are probed
479 AVInputFormat *av_probe_input_format(AVProbeData *pd, int is_opened);
482 * Allocates all the structures needed to read an input stream.
483 * This does not open the needed codecs for decoding the stream[s].
485 int av_open_input_stream(AVFormatContext **ic_ptr,
486 ByteIOContext *pb, const char *filename,
487 AVInputFormat *fmt, AVFormatParameters *ap);
490 * Open a media file as input. The codec are not opened. Only the file
491 * header (if present) is read.
493 * @param ic_ptr the opened media file handle is put here
494 * @param filename filename to open.
495 * @param fmt if non NULL, force the file format to use
496 * @param buf_size optional buffer size (zero if default is OK)
497 * @param ap additionnal parameters needed when opening the file (NULL if default)
498 * @return 0 if OK. AVERROR_xxx otherwise.
500 int av_open_input_file(AVFormatContext **ic_ptr, const char *filename,
503 AVFormatParameters *ap);
504 /** no av_open for output, so applications will need this: */
505 AVFormatContext *av_alloc_format_context(void);
508 * Read packets of a media file to get stream information. This
509 * is useful for file formats with no headers such as MPEG. This
510 * function also computes the real frame rate in case of mpeg2 repeat
512 * The logical file position is not changed by this function;
513 * examined packets may be buffered for later processing.
515 * @param ic media file handle
516 * @return >=0 if OK. AVERROR_xxx if error.
517 * @todo let user decide somehow what information is needed so we dont waste time geting stuff the user doesnt need
519 int av_find_stream_info(AVFormatContext *ic);
522 * Read a transport packet from a media file.
524 * This function is absolete and should never be used.
525 * Use av_read_frame() instead.
527 * @param s media file handle
528 * @param pkt is filled
529 * @return 0 if OK. AVERROR_xxx if error.
531 int av_read_packet(AVFormatContext *s, AVPacket *pkt);
534 * Return the next frame of a stream.
536 * The returned packet is valid
537 * until the next av_read_frame() or until av_close_input_file() and
538 * must be freed with av_free_packet. For video, the packet contains
539 * exactly one frame. For audio, it contains an integer number of
540 * frames if each frame has a known fixed size (e.g. PCM or ADPCM
541 * data). If the audio frames have a variable size (e.g. MPEG audio),
542 * then it contains one frame.
544 * pkt->pts, pkt->dts and pkt->duration are always set to correct
545 * values in AVStream.timebase units (and guessed if the format cannot
546 * provided them). pkt->pts can be AV_NOPTS_VALUE if the video format
547 * has B frames, so it is better to rely on pkt->dts if you do not
548 * decompress the payload.
550 * @return 0 if OK, < 0 if error or end of file.
552 int av_read_frame(AVFormatContext *s, AVPacket *pkt);
555 * Seek to the key frame at timestamp.
556 * 'timestamp' in 'stream_index'.
557 * @param stream_index If stream_index is (-1), a default
558 * stream is selected, and timestamp is automatically converted
559 * from AV_TIME_BASE units to the stream specific time_base.
560 * @param timestamp timestamp in AVStream.time_base units
561 * or if there is no stream specified then in AV_TIME_BASE units
562 * @param flags flags which select direction and seeking mode
563 * @return >= 0 on success
565 int av_seek_frame(AVFormatContext *s, int stream_index, int64_t timestamp, int flags);
568 * start playing a network based stream (e.g. RTSP stream) at the
571 int av_read_play(AVFormatContext *s);
574 * Pause a network based stream (e.g. RTSP stream).
576 * Use av_read_play() to resume it.
578 int av_read_pause(AVFormatContext *s);
581 * Close a media file (but not its codecs).
583 * @param s media file handle
585 void av_close_input_file(AVFormatContext *s);
588 * Add a new stream to a media file.
590 * Can only be called in the read_header() function. If the flag
591 * AVFMTCTX_NOHEADER is in the format context, then new streams
592 * can be added in read_packet too.
594 * @param s media file handle
595 * @param id file format dependent stream id
597 AVStream *av_new_stream(AVFormatContext *s, int id);
600 * Set the pts for a given stream.
603 * @param pts_wrap_bits number of bits effectively used by the pts
604 * (used for wrap control, 33 is the value for MPEG)
605 * @param pts_num numerator to convert to seconds (MPEG: 1)
606 * @param pts_den denominator to convert to seconds (MPEG: 90000)
608 void av_set_pts_info(AVStream *s, int pts_wrap_bits,
609 int pts_num, int pts_den);
611 #define AVSEEK_FLAG_BACKWARD 1 ///< seek backward
612 #define AVSEEK_FLAG_BYTE 2 ///< seeking based on position in bytes
613 #define AVSEEK_FLAG_ANY 4 ///< seek to any frame, even non keyframes
615 int av_find_default_stream_index(AVFormatContext *s);
618 * Gets the index for a specific timestamp.
619 * @param flags if AVSEEK_FLAG_BACKWARD then the returned index will correspond to
620 * the timestamp which is <= the requested one, if backward is 0
622 * if AVSEEK_FLAG_ANY seek to any frame, only keyframes otherwise
623 * @return < 0 if no such timestamp could be found
625 int av_index_search_timestamp(AVStream *st, int64_t timestamp, int flags);
628 * Add a index entry into a sorted list updateing if it is already there.
630 * @param timestamp timestamp in the timebase of the given stream
632 int av_add_index_entry(AVStream *st,
633 int64_t pos, int64_t timestamp, int size, int distance, int flags);
636 * Does a binary search using av_index_search_timestamp() and AVCodec.read_timestamp().
637 * this isnt supposed to be called directly by a user application, but by demuxers
638 * @param target_ts target timestamp in the time base of the given stream
639 * @param stream_index stream number
641 int av_seek_frame_binary(AVFormatContext *s, int stream_index, int64_t target_ts, int flags);
644 * Updates cur_dts of all streams based on given timestamp and AVStream.
646 * Stream ref_st unchanged, others set cur_dts in their native timebase
647 * only needed for timestamp wrapping or if (dts not set and pts!=dts)
648 * @param timestamp new dts expressed in time_base of param ref_st
649 * @param ref_st reference stream giving time_base of param timestamp
651 void av_update_cur_dts(AVFormatContext *s, AVStream *ref_st, int64_t timestamp);
654 * Does a binary search using read_timestamp().
655 * this isnt supposed to be called directly by a user application, but by demuxers
656 * @param target_ts target timestamp in the time base of the given stream
657 * @param stream_index stream number
659 int64_t av_gen_search(AVFormatContext *s, int stream_index, int64_t target_ts, int64_t pos_min, int64_t pos_max, int64_t pos_limit, int64_t ts_min, int64_t ts_max, int flags, int64_t *ts_ret, int64_t (*read_timestamp)(struct AVFormatContext *, int , int64_t *, int64_t ));
661 /** media file output */
662 int av_set_parameters(AVFormatContext *s, AVFormatParameters *ap);
665 * allocate the stream private data and write the stream header to an
668 * @param s media file handle
669 * @return 0 if OK. AVERROR_xxx if error.
671 int av_write_header(AVFormatContext *s);
674 * Write a packet to an output media file.
676 * The packet shall contain one audio or video frame.
677 * The packet must be correctly interleaved according to the container specification,
678 * if not then av_interleaved_write_frame must be used
680 * @param s media file handle
681 * @param pkt the packet, which contains the stream_index, buf/buf_size, dts/pts, ...
682 * @return < 0 if error, = 0 if OK, 1 if end of stream wanted.
684 int av_write_frame(AVFormatContext *s, AVPacket *pkt);
687 * Writes a packet to an output media file ensuring correct interleaving.
689 * The packet must contain one audio or video frame.
690 * If the packets are already correctly interleaved the application should
691 * call av_write_frame() instead as its slightly faster, its also important
692 * to keep in mind that completly non interleaved input will need huge amounts
693 * of memory to interleave with this, so its prefereable to interleave at the
696 * @param s media file handle
697 * @param pkt the packet, which contains the stream_index, buf/buf_size, dts/pts, ...
698 * @return < 0 if error, = 0 if OK, 1 if end of stream wanted.
700 int av_interleaved_write_frame(AVFormatContext *s, AVPacket *pkt);
703 * Interleave a packet per DTS in an output media file.
705 * Packets with pkt->destruct == av_destruct_packet will be freed inside this function,
706 * so they cannot be used after it, note calling av_free_packet() on them is still safe.
708 * @param s media file handle
709 * @param out the interleaved packet will be output here
710 * @param in the input packet
711 * @param flush 1 if no further packets are available as input and all
712 * remaining packets should be output
713 * @return 1 if a packet was output, 0 if no packet could be output,
714 * < 0 if an error occured
716 int av_interleave_packet_per_dts(AVFormatContext *s, AVPacket *out, AVPacket *pkt, int flush);
719 * @brief Write the stream trailer to an output media file and
720 * free the file private data.
722 * @param s media file handle
723 * @return 0 if OK. AVERROR_xxx if error.
725 int av_write_trailer(AVFormatContext *s);
727 void dump_format(AVFormatContext *ic,
733 * parses width and height out of string str.
735 int parse_image_size(int *width_ptr, int *height_ptr, const char *str);
738 * Converts frame rate from string to a fraction.
740 int parse_frame_rate(int *frame_rate, int *frame_rate_base, const char *arg);
743 * Converts date string to number of seconds since Jan 1st, 1970.
747 * - If not a duration:
748 * [{YYYY-MM-DD|YYYYMMDD}]{T| }{HH[:MM[:SS[.m...]]][Z]|HH[MM[SS[.m...]]][Z]}
749 * Time is localtime unless Z is suffixed to the end. In this case GMT
750 * Return the date in micro seconds since 1970
753 * HH[:MM[:SS[.m...]]]
757 int64_t parse_date(const char *datestr, int duration);
759 int64_t av_gettime(void);
761 /* ffm specific for ffserver */
762 #define FFM_PACKET_SIZE 4096
763 offset_t ffm_read_write_index(int fd);
764 void ffm_write_write_index(int fd, offset_t pos);
765 void ffm_set_write_index(AVFormatContext *s, offset_t pos, offset_t file_size);
768 * Attempts to find a specific tag in a URL.
770 * syntax: '?tag1=val1&tag2=val2...'. Little URL decoding is done.
773 int find_info_tag(char *arg, int arg_size, const char *tag1, const char *info);
776 * Returns in 'buf' the path with '%d' replaced by number.
778 * Also handles the '%0nd' format where 'n' is the total number
779 * of digits and '%%'.
781 * @param buf destination buffer
782 * @param buf_size destination buffer size
783 * @param path numbered sequence string
784 * @number frame number
785 * @return 0 if OK, -1 if format error.
787 int av_get_frame_filename(char *buf, int buf_size,
788 const char *path, int number);
791 * Check whether filename actually is a numbered sequence generator.
793 * @param filename possible numbered sequence string
794 * @return 1 if a valid numbered sequence string, 0 otherwise.
796 int av_filename_number_test(const char *filename);
799 int video_grab_init(void);
800 int audio_init(void);
803 int dv1394_init(void);
804 int dc1394_init(void);
806 #ifdef HAVE_AV_CONFIG_H
808 #include "os_support.h"
810 int strstart(const char *str, const char *val, const char **ptr);
811 int stristart(const char *str, const char *val, const char **ptr);
812 void pstrcpy(char *buf, int buf_size, const char *str);
813 char *pstrcat(char *buf, int buf_size, const char *s);
815 void __dynarray_add(unsigned long **tab_ptr, int *nb_ptr, unsigned long elem);
818 #define dynarray_add(tab, nb_ptr, elem)\
820 typeof(tab) _tab = (tab);\
821 typeof(elem) _elem = (elem);\
822 (void)sizeof(**_tab == _elem); /* check that types are compatible */\
823 __dynarray_add((unsigned long **)_tab, nb_ptr, (unsigned long)_elem);\
826 #define dynarray_add(tab, nb_ptr, elem)\
828 __dynarray_add((unsigned long **)(tab), nb_ptr, (unsigned long)(elem));\
832 time_t mktimegm(struct tm *tm);
833 struct tm *brktimegm(time_t secs, struct tm *tm);
834 const char *small_strptime(const char *p, const char *fmt,
838 int resolve_host(struct in_addr *sin_addr, const char *hostname);
840 void url_split(char *proto, int proto_size,
841 char *authorization, int authorization_size,
842 char *hostname, int hostname_size,
844 char *path, int path_size,
847 int match_ext(const char *filename, const char *extensions);
849 #endif /* HAVE_AV_CONFIG_H */
855 #endif /* AVFORMAT_H */