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)+(12<<8)+0)
29 #define LIBAVFORMAT_VERSION 51.12.0
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
135 #define AVPROBE_PADDING_SIZE 32 ///< extra allocated bytes at the end of the probe buffer
137 typedef struct AVFormatParameters {
138 AVRational time_base;
143 enum PixelFormat pix_fmt;
144 int channel; /**< used to select dv channel */
145 #if LIBAVFORMAT_VERSION_INT < (52<<16)
146 const char *device; /**< video, audio or DV device */
148 const char *standard; /**< tv standard, NTSC, PAL, SECAM */
149 int mpeg2ts_raw:1; /**< force raw MPEG2 transport stream output, if possible */
150 int mpeg2ts_compute_pcr:1; /**< compute exact PCR for each transport
151 stream packet (only meaningful if
152 mpeg2ts_raw is TRUE */
153 int initial_pause:1; /**< do not begin to play the stream
154 immediately (RTSP only) */
155 int prealloced_context:1;
156 enum CodecID video_codec_id;
157 enum CodecID audio_codec_id;
158 } AVFormatParameters;
160 //! demuxer will use url_fopen, no opened file should be provided by the caller
161 #define AVFMT_NOFILE 0x0001
162 #define AVFMT_NEEDNUMBER 0x0002 /**< needs '%d' in filename */
163 #define AVFMT_SHOW_IDS 0x0008 /**< show format stream IDs numbers */
164 #define AVFMT_RAWPICTURE 0x0020 /**< format wants AVPicture structure for
166 #define AVFMT_GLOBALHEADER 0x0040 /**< format wants global header */
167 #define AVFMT_NOTIMESTAMPS 0x0080 /**< format doesnt need / has any timestamps */
168 #define AVFMT_GENERIC_INDEX 0x0100 /**< use generic index building code */
170 typedef struct AVOutputFormat {
172 const char *long_name;
173 const char *mime_type;
174 const char *extensions; /**< comma separated filename extensions */
175 /** size of private data so that it can be allocated in the wrapper */
178 enum CodecID audio_codec; /**< default audio codec */
179 enum CodecID video_codec; /**< default video codec */
180 int (*write_header)(struct AVFormatContext *);
181 int (*write_packet)(struct AVFormatContext *, AVPacket *pkt);
182 int (*write_trailer)(struct AVFormatContext *);
183 /** can use flags: AVFMT_NOFILE, AVFMT_NEEDNUMBER, AVFMT_GLOBALHEADER */
185 /** currently only used to set pixel format if not YUV420P */
186 int (*set_parameters)(struct AVFormatContext *, AVFormatParameters *);
187 int (*interleave_packet)(struct AVFormatContext *, AVPacket *out, AVPacket *in, int flush);
190 * list of supported codec_id-codec_tag pairs, ordered by "better choice first"
191 * the arrays are all CODEC_ID_NONE terminated
193 const struct AVCodecTag **codec_tag;
196 struct AVOutputFormat *next;
199 typedef struct AVInputFormat {
201 const char *long_name;
202 /** size of private data so that it can be allocated in the wrapper */
204 /** tell if a given file has a chance of being parsing by this format */
205 int (*read_probe)(AVProbeData *);
206 /** read the format header and initialize the AVFormatContext
207 structure. Return 0 if OK. 'ap' if non NULL contains
208 additional paramters. Only used in raw format right
209 now. 'av_new_stream' should be called to create new streams. */
210 int (*read_header)(struct AVFormatContext *,
211 AVFormatParameters *ap);
212 /** read one packet and put it in 'pkt'. pts and flags are also
213 set. 'av_new_stream' can be called only if the flag
214 AVFMTCTX_NOHEADER is used. */
215 int (*read_packet)(struct AVFormatContext *, AVPacket *pkt);
216 /** close the stream. The AVFormatContext and AVStreams are not
217 freed by this function */
218 int (*read_close)(struct AVFormatContext *);
220 * seek to a given timestamp relative to the frames in
221 * stream component stream_index
222 * @param stream_index must not be -1
223 * @param flags selects which direction should be preferred if no exact
226 int (*read_seek)(struct AVFormatContext *,
227 int stream_index, int64_t timestamp, int flags);
229 * gets the next timestamp in AV_TIME_BASE units.
231 int64_t (*read_timestamp)(struct AVFormatContext *s, int stream_index,
232 int64_t *pos, int64_t pos_limit);
233 /** can use flags: AVFMT_NOFILE, AVFMT_NEEDNUMBER */
235 /** if extensions are defined, then no probe is done. You should
236 usually not use extension format guessing because it is not
238 const char *extensions;
239 /** general purpose read only value that the format can use */
242 /** start/resume playing - only meaningful if using a network based format
244 int (*read_play)(struct AVFormatContext *);
246 /** pause playing - only meaningful if using a network based format
248 int (*read_pause)(struct AVFormatContext *);
250 const struct AVCodecTag **codec_tag;
253 struct AVInputFormat *next;
256 typedef struct AVIndexEntry {
259 #define AVINDEX_KEYFRAME 0x0001
261 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)
262 int min_distance; /**< min distance between this and the previous keyframe, used to avoid unneeded searching */
265 typedef struct AVStream {
266 int index; /**< stream index in AVFormatContext */
267 int id; /**< format specific stream id */
268 AVCodecContext *codec; /**< codec context */
270 * real base frame rate of the stream.
271 * this is the lowest framerate with which all timestamps can be
272 * represented accurately (its the least common multiple of all
273 * framerates in the stream), Note, this value is just a guess!
274 * for example if the timebase is 1/90000 and all frames have either
275 * approximately 3600 or 1800 timer ticks then r_frame_rate will be 50/1
277 AVRational r_frame_rate;
279 #if LIBAVFORMAT_VERSION_INT < (52<<16)
280 /* internal data used in av_find_stream_info() */
281 int64_t codec_info_duration;
282 int codec_info_nb_frames;
284 /** encoding: PTS generation when outputing stream */
288 * this is the fundamental unit of time (in seconds) in terms
289 * of which frame timestamps are represented. for fixed-fps content,
290 * timebase should be 1/framerate and timestamp increments should be
293 AVRational time_base;
294 int pts_wrap_bits; /**< number of bits in pts (used for wrapping control) */
295 /* ffmpeg.c private use */
296 int stream_copy; /**< if set, just copy stream */
297 enum AVDiscard discard; ///< selects which packets can be discarded at will and dont need to be demuxed
298 //FIXME move stuff to a flags field?
299 /** quality, as it has been removed from AVCodecContext and put in AVVideoFrame
300 * MN:dunno if thats the right place, for it */
302 /** decoding: position of the first frame of the component, in
303 AV_TIME_BASE fractional seconds. */
305 /** decoding: duration of the stream, in AV_TIME_BASE fractional
309 char language[4]; /** ISO 639 3-letter language code (empty string if undefined) */
311 /* av_read_frame() support */
312 int need_parsing; ///< 1->full parsing needed, 2->only parse headers dont repack
313 struct AVCodecParserContext *parser;
316 int last_IP_duration;
318 /* av_seek_frame() support */
319 AVIndexEntry *index_entries; /**< only used if the format does not
320 support seeking natively */
321 int nb_index_entries;
322 unsigned int index_entries_allocated_size;
324 int64_t nb_frames; ///< number of frames in this stream if known or 0
326 #define MAX_REORDER_DELAY 4
327 int64_t pts_buffer[MAX_REORDER_DELAY+1];
330 #define AVFMTCTX_NOHEADER 0x0001 /**< signal that no header is present
331 (streams are added dynamically) */
333 #define MAX_STREAMS 20
335 /* format I/O context */
336 typedef struct AVFormatContext {
337 const AVClass *av_class; /**< set by av_alloc_format_context */
338 /* can only be iformat or oformat, not both at the same time */
339 struct AVInputFormat *iformat;
340 struct AVOutputFormat *oformat;
343 unsigned int nb_streams;
344 AVStream *streams[MAX_STREAMS];
345 char filename[1024]; /**< input or output filename */
353 int year; /**< ID3 year, 0 if none */
354 int track; /**< track number, 0 if none */
355 char genre[32]; /**< ID3 genre */
357 int ctx_flags; /**< format specific flags, see AVFMTCTX_xx */
358 /* private data for pts handling (do not modify directly) */
359 /** This buffer is only needed when packets were already buffered but
360 not decoded, for example to get the codec parameters in mpeg
362 struct AVPacketList *packet_buffer;
364 /** decoding: position of the first frame of the component, in
365 AV_TIME_BASE fractional seconds. NEVER set this value directly:
366 it is deduced from the AVStream values. */
368 /** decoding: duration of the stream, in AV_TIME_BASE fractional
369 seconds. NEVER set this value directly: it is deduced from the
372 /** decoding: total file size. 0 if unknown */
374 /** decoding: total stream bitrate in bit/s, 0 if not
375 available. Never set it directly if the file_size and the
376 duration are known as ffmpeg can compute it automatically. */
379 /* av_read_frame() support */
381 const uint8_t *cur_ptr;
385 /* av_seek_frame() support */
386 int64_t data_offset; /** offset of the first packet */
394 #define AVFMT_NOOUTPUTLOOP -1
395 #define AVFMT_INFINITEOUTPUTLOOP 0
396 /** number of times to loop output in formats that support it */
400 #define AVFMT_FLAG_GENPTS 0x0001 ///< generate pts if missing even if it requires parsing future frames
401 #define AVFMT_FLAG_IGNIDX 0x0002 ///< ignore index
404 /** decoding: size of data to probe; encoding unused */
405 unsigned int probesize;
408 * maximum duration in AV_TIME_BASE units over which the input should be analyzed in av_find_stream_info()
410 int max_analyze_duration;
416 typedef struct AVPacketList {
418 struct AVPacketList *next;
421 extern AVInputFormat *first_iformat;
422 extern AVOutputFormat *first_oformat;
424 enum CodecID av_guess_image2_codec(const char *filename);
426 /* XXX: use automatic init with either ELF sections or C file parser */
434 void av_register_input_format(AVInputFormat *format);
435 void av_register_output_format(AVOutputFormat *format);
436 AVOutputFormat *guess_stream_format(const char *short_name,
437 const char *filename, const char *mime_type);
438 AVOutputFormat *guess_format(const char *short_name,
439 const char *filename, const char *mime_type);
442 * Guesses the codec id based upon muxer and filename.
444 enum CodecID av_guess_codec(AVOutputFormat *fmt, const char *short_name,
445 const char *filename, const char *mime_type, enum CodecType type);
448 * Send a nice hexadecimal dump of a buffer to the specified file stream.
450 * @param f The file stream pointer where the dump should be sent to.
452 * @param size buffer size
454 * @see av_hex_dump_log, av_pkt_dump, av_pkt_dump_log
456 void av_hex_dump(FILE *f, uint8_t *buf, int size);
459 * Send a nice hexadecimal dump of a buffer to the log.
461 * @param avcl A pointer to an arbitrary struct of which the first field is a
462 * pointer to an AVClass struct.
463 * @param level The importance level of the message, lower values signifying
466 * @param size buffer size
468 * @see av_hex_dump, av_pkt_dump, av_pkt_dump_log
470 void av_hex_dump_log(void *avcl, int level, uint8_t *buf, int size);
473 * Send a nice dump of a packet to the specified file stream.
475 * @param f The file stream pointer where the dump should be sent to.
476 * @param pkt packet to dump
477 * @param dump_payload true if the payload must be displayed too
479 void av_pkt_dump(FILE *f, AVPacket *pkt, int dump_payload);
482 * Send a nice dump of a packet to the log.
484 * @param avcl A pointer to an arbitrary struct of which the first field is a
485 * pointer to an AVClass struct.
486 * @param level The importance level of the message, lower values signifying
488 * @param pkt packet to dump
489 * @param dump_payload true if the payload must be displayed too
491 void av_pkt_dump_log(void *avcl, int level, AVPacket *pkt, int dump_payload);
493 void av_register_all(void);
495 /** codec tag <-> codec id */
496 enum CodecID av_codec_get_id(const struct AVCodecTag **tags, unsigned int tag);
497 unsigned int av_codec_get_tag(const struct AVCodecTag **tags, enum CodecID id);
499 /* media file input */
502 * finds AVInputFormat based on input format's short name.
504 AVInputFormat *av_find_input_format(const char *short_name);
509 * @param is_opened whether the file is already opened, determines whether
510 * demuxers with or without AVFMT_NOFILE are probed
512 AVInputFormat *av_probe_input_format(AVProbeData *pd, int is_opened);
515 * Allocates all the structures needed to read an input stream.
516 * This does not open the needed codecs for decoding the stream[s].
518 int av_open_input_stream(AVFormatContext **ic_ptr,
519 ByteIOContext *pb, const char *filename,
520 AVInputFormat *fmt, AVFormatParameters *ap);
523 * Open a media file as input. The codec are not opened. Only the file
524 * header (if present) is read.
526 * @param ic_ptr the opened media file handle is put here
527 * @param filename filename to open.
528 * @param fmt if non NULL, force the file format to use
529 * @param buf_size optional buffer size (zero if default is OK)
530 * @param ap additional parameters needed when opening the file (NULL if default)
531 * @return 0 if OK. AVERROR_xxx otherwise.
533 int av_open_input_file(AVFormatContext **ic_ptr, const char *filename,
536 AVFormatParameters *ap);
537 /** no av_open for output, so applications will need this: */
538 AVFormatContext *av_alloc_format_context(void);
541 * Read packets of a media file to get stream information. This
542 * is useful for file formats with no headers such as MPEG. This
543 * function also computes the real frame rate in case of mpeg2 repeat
545 * The logical file position is not changed by this function;
546 * examined packets may be buffered for later processing.
548 * @param ic media file handle
549 * @return >=0 if OK. AVERROR_xxx if error.
550 * @todo let user decide somehow what information is needed so we dont waste time geting stuff the user doesnt need
552 int av_find_stream_info(AVFormatContext *ic);
555 * Read a transport packet from a media file.
557 * This function is absolete and should never be used.
558 * Use av_read_frame() instead.
560 * @param s media file handle
561 * @param pkt is filled
562 * @return 0 if OK. AVERROR_xxx if error.
564 int av_read_packet(AVFormatContext *s, AVPacket *pkt);
567 * Return the next frame of a stream.
569 * The returned packet is valid
570 * until the next av_read_frame() or until av_close_input_file() and
571 * must be freed with av_free_packet. For video, the packet contains
572 * exactly one frame. For audio, it contains an integer number of
573 * frames if each frame has a known fixed size (e.g. PCM or ADPCM
574 * data). If the audio frames have a variable size (e.g. MPEG audio),
575 * then it contains one frame.
577 * pkt->pts, pkt->dts and pkt->duration are always set to correct
578 * values in AVStream.timebase units (and guessed if the format cannot
579 * provided them). pkt->pts can be AV_NOPTS_VALUE if the video format
580 * has B frames, so it is better to rely on pkt->dts if you do not
581 * decompress the payload.
583 * @return 0 if OK, < 0 if error or end of file.
585 int av_read_frame(AVFormatContext *s, AVPacket *pkt);
588 * Seek to the key frame at timestamp.
589 * 'timestamp' in 'stream_index'.
590 * @param stream_index If stream_index is (-1), a default
591 * stream is selected, and timestamp is automatically converted
592 * from AV_TIME_BASE units to the stream specific time_base.
593 * @param timestamp timestamp in AVStream.time_base units
594 * or if there is no stream specified then in AV_TIME_BASE units
595 * @param flags flags which select direction and seeking mode
596 * @return >= 0 on success
598 int av_seek_frame(AVFormatContext *s, int stream_index, int64_t timestamp, int flags);
601 * start playing a network based stream (e.g. RTSP stream) at the
604 int av_read_play(AVFormatContext *s);
607 * Pause a network based stream (e.g. RTSP stream).
609 * Use av_read_play() to resume it.
611 int av_read_pause(AVFormatContext *s);
614 * Close a media file (but not its codecs).
616 * @param s media file handle
618 void av_close_input_file(AVFormatContext *s);
621 * Add a new stream to a media file.
623 * Can only be called in the read_header() function. If the flag
624 * AVFMTCTX_NOHEADER is in the format context, then new streams
625 * can be added in read_packet too.
627 * @param s media file handle
628 * @param id file format dependent stream id
630 AVStream *av_new_stream(AVFormatContext *s, int id);
633 * Set the pts for a given stream.
636 * @param pts_wrap_bits number of bits effectively used by the pts
637 * (used for wrap control, 33 is the value for MPEG)
638 * @param pts_num numerator to convert to seconds (MPEG: 1)
639 * @param pts_den denominator to convert to seconds (MPEG: 90000)
641 void av_set_pts_info(AVStream *s, int pts_wrap_bits,
642 int pts_num, int pts_den);
644 #define AVSEEK_FLAG_BACKWARD 1 ///< seek backward
645 #define AVSEEK_FLAG_BYTE 2 ///< seeking based on position in bytes
646 #define AVSEEK_FLAG_ANY 4 ///< seek to any frame, even non keyframes
648 int av_find_default_stream_index(AVFormatContext *s);
651 * Gets the index for a specific timestamp.
652 * @param flags if AVSEEK_FLAG_BACKWARD then the returned index will correspond to
653 * the timestamp which is <= the requested one, if backward is 0
655 * if AVSEEK_FLAG_ANY seek to any frame, only keyframes otherwise
656 * @return < 0 if no such timestamp could be found
658 int av_index_search_timestamp(AVStream *st, int64_t timestamp, int flags);
661 * Add a index entry into a sorted list updateing if it is already there.
663 * @param timestamp timestamp in the timebase of the given stream
665 int av_add_index_entry(AVStream *st,
666 int64_t pos, int64_t timestamp, int size, int distance, int flags);
669 * Does a binary search using av_index_search_timestamp() and AVCodec.read_timestamp().
670 * this isnt supposed to be called directly by a user application, but by demuxers
671 * @param target_ts target timestamp in the time base of the given stream
672 * @param stream_index stream number
674 int av_seek_frame_binary(AVFormatContext *s, int stream_index, int64_t target_ts, int flags);
677 * Updates cur_dts of all streams based on given timestamp and AVStream.
679 * Stream ref_st unchanged, others set cur_dts in their native timebase
680 * only needed for timestamp wrapping or if (dts not set and pts!=dts)
681 * @param timestamp new dts expressed in time_base of param ref_st
682 * @param ref_st reference stream giving time_base of param timestamp
684 void av_update_cur_dts(AVFormatContext *s, AVStream *ref_st, int64_t timestamp);
687 * Does a binary search using read_timestamp().
688 * this isnt supposed to be called directly by a user application, but by demuxers
689 * @param target_ts target timestamp in the time base of the given stream
690 * @param stream_index stream number
692 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 ));
694 /** media file output */
695 int av_set_parameters(AVFormatContext *s, AVFormatParameters *ap);
698 * allocate the stream private data and write the stream header to an
701 * @param s media file handle
702 * @return 0 if OK. AVERROR_xxx if error.
704 int av_write_header(AVFormatContext *s);
707 * Write a packet to an output media file.
709 * The packet shall contain one audio or video frame.
710 * The packet must be correctly interleaved according to the container specification,
711 * if not then av_interleaved_write_frame must be used
713 * @param s media file handle
714 * @param pkt the packet, which contains the stream_index, buf/buf_size, dts/pts, ...
715 * @return < 0 if error, = 0 if OK, 1 if end of stream wanted.
717 int av_write_frame(AVFormatContext *s, AVPacket *pkt);
720 * Writes a packet to an output media file ensuring correct interleaving.
722 * The packet must contain one audio or video frame.
723 * If the packets are already correctly interleaved the application should
724 * call av_write_frame() instead as its slightly faster, its also important
725 * to keep in mind that completly non interleaved input will need huge amounts
726 * of memory to interleave with this, so its prefereable to interleave at the
729 * @param s media file handle
730 * @param pkt the packet, which contains the stream_index, buf/buf_size, dts/pts, ...
731 * @return < 0 if error, = 0 if OK, 1 if end of stream wanted.
733 int av_interleaved_write_frame(AVFormatContext *s, AVPacket *pkt);
736 * Interleave a packet per DTS in an output media file.
738 * Packets with pkt->destruct == av_destruct_packet will be freed inside this function,
739 * so they cannot be used after it, note calling av_free_packet() on them is still safe.
741 * @param s media file handle
742 * @param out the interleaved packet will be output here
743 * @param in the input packet
744 * @param flush 1 if no further packets are available as input and all
745 * remaining packets should be output
746 * @return 1 if a packet was output, 0 if no packet could be output,
747 * < 0 if an error occured
749 int av_interleave_packet_per_dts(AVFormatContext *s, AVPacket *out, AVPacket *pkt, int flush);
752 * @brief Write the stream trailer to an output media file and
753 * free the file private data.
755 * @param s media file handle
756 * @return 0 if OK. AVERROR_xxx if error.
758 int av_write_trailer(AVFormatContext *s);
760 void dump_format(AVFormatContext *ic,
766 * parses width and height out of string str.
768 int parse_image_size(int *width_ptr, int *height_ptr, const char *str);
771 * Converts frame rate from string to a fraction.
773 int parse_frame_rate(int *frame_rate, int *frame_rate_base, const char *arg);
776 * Converts date string to number of seconds since Jan 1st, 1970.
780 * - If not a duration:
781 * [{YYYY-MM-DD|YYYYMMDD}]{T| }{HH[:MM[:SS[.m...]]][Z]|HH[MM[SS[.m...]]][Z]}
782 * Time is localtime unless Z is suffixed to the end. In this case GMT
783 * Return the date in micro seconds since 1970
786 * HH[:MM[:SS[.m...]]]
790 int64_t parse_date(const char *datestr, int duration);
792 int64_t av_gettime(void);
794 /* ffm specific for ffserver */
795 #define FFM_PACKET_SIZE 4096
796 offset_t ffm_read_write_index(int fd);
797 void ffm_write_write_index(int fd, offset_t pos);
798 void ffm_set_write_index(AVFormatContext *s, offset_t pos, offset_t file_size);
801 * Attempts to find a specific tag in a URL.
803 * syntax: '?tag1=val1&tag2=val2...'. Little URL decoding is done.
806 int find_info_tag(char *arg, int arg_size, const char *tag1, const char *info);
809 * Returns in 'buf' the path with '%d' replaced by number.
811 * Also handles the '%0nd' format where 'n' is the total number
812 * of digits and '%%'.
814 * @param buf destination buffer
815 * @param buf_size destination buffer size
816 * @param path numbered sequence string
817 * @number frame number
818 * @return 0 if OK, -1 if format error.
820 int av_get_frame_filename(char *buf, int buf_size,
821 const char *path, int number);
824 * Check whether filename actually is a numbered sequence generator.
826 * @param filename possible numbered sequence string
827 * @return 1 if a valid numbered sequence string, 0 otherwise.
829 int av_filename_number_test(const char *filename);
832 int video_grab_init(void);
833 int audio_init(void);
836 int dv1394_init(void);
837 int dc1394_init(void);
839 #ifdef HAVE_AV_CONFIG_H
841 #include "os_support.h"
843 int strstart(const char *str, const char *val, const char **ptr);
844 int stristart(const char *str, const char *val, const char **ptr);
845 void pstrcpy(char *buf, int buf_size, const char *str);
846 char *pstrcat(char *buf, int buf_size, const char *s);
848 void __dynarray_add(unsigned long **tab_ptr, int *nb_ptr, unsigned long elem);
851 #define dynarray_add(tab, nb_ptr, elem)\
853 typeof(tab) _tab = (tab);\
854 typeof(elem) _elem = (elem);\
855 (void)sizeof(**_tab == _elem); /* check that types are compatible */\
856 __dynarray_add((unsigned long **)_tab, nb_ptr, (unsigned long)_elem);\
859 #define dynarray_add(tab, nb_ptr, elem)\
861 __dynarray_add((unsigned long **)(tab), nb_ptr, (unsigned long)(elem));\
865 time_t mktimegm(struct tm *tm);
866 struct tm *brktimegm(time_t secs, struct tm *tm);
867 const char *small_strptime(const char *p, const char *fmt,
871 int resolve_host(struct in_addr *sin_addr, const char *hostname);
873 void url_split(char *proto, int proto_size,
874 char *authorization, int authorization_size,
875 char *hostname, int hostname_size,
877 char *path, int path_size,
880 int match_ext(const char *filename, const char *extensions);
882 #endif /* HAVE_AV_CONFIG_H */
888 #endif /* AVFORMAT_H */