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
21 #ifndef FFMPEG_AVFORMAT_H
22 #define FFMPEG_AVFORMAT_H
24 #define LIBAVFORMAT_VERSION_MAJOR 52
25 #define LIBAVFORMAT_VERSION_MINOR 14
26 #define LIBAVFORMAT_VERSION_MICRO 0
28 #define LIBAVFORMAT_VERSION_INT AV_VERSION_INT(LIBAVFORMAT_VERSION_MAJOR, \
29 LIBAVFORMAT_VERSION_MINOR, \
30 LIBAVFORMAT_VERSION_MICRO)
31 #define LIBAVFORMAT_VERSION AV_VERSION(LIBAVFORMAT_VERSION_MAJOR, \
32 LIBAVFORMAT_VERSION_MINOR, \
33 LIBAVFORMAT_VERSION_MICRO)
34 #define LIBAVFORMAT_BUILD LIBAVFORMAT_VERSION_INT
36 #define LIBAVFORMAT_IDENT "Lavf" AV_STRINGIFY(LIBAVFORMAT_VERSION)
39 #include <stdio.h> /* FILE */
40 #include "libavcodec/avcodec.h"
44 /* packet functions */
46 typedef struct AVPacket {
47 int64_t pts; ///< presentation time stamp in time_base units
48 int64_t dts; ///< decompression time stamp in time_base units
53 int duration; ///< presentation duration in time_base units (0 if not available)
54 void (*destruct)(struct AVPacket *);
56 int64_t pos; ///< byte position in stream, -1 if unknown
58 #define PKT_FLAG_KEY 0x0001
60 void av_destruct_packet_nofree(AVPacket *pkt);
63 * Default packet destructor.
65 void av_destruct_packet(AVPacket *pkt);
68 * Initialize optional fields of a packet to default values.
72 void av_init_packet(AVPacket *pkt);
75 * Allocate the payload of a packet and initialize its fields to default values.
78 * @param size wanted payload size
79 * @return 0 if OK. AVERROR_xxx otherwise.
81 int av_new_packet(AVPacket *pkt, int size);
84 * Allocate and read the payload of a packet and initialize its fields to default values.
87 * @param size wanted payload size
88 * @return >0 (read size) if OK. AVERROR_xxx otherwise.
90 int av_get_packet(ByteIOContext *s, AVPacket *pkt, int size);
93 * @warning This is a hack - the packet memory allocation stuff is broken. The
94 * packet is allocated if it was not really allocated
96 int av_dup_packet(AVPacket *pkt);
101 * @param pkt packet to free
103 static inline void av_free_packet(AVPacket *pkt)
105 if (pkt && pkt->destruct) {
110 /*************************************************/
111 /* fractional numbers for exact pts handling */
114 * the exact value of the fractional number is: 'val + num / den'.
115 * num is assumed to be such as 0 <= num < den
116 * @deprecated Use AVRational instead
118 typedef struct AVFrac {
119 int64_t val, num, den;
120 } AVFrac attribute_deprecated;
122 /*************************************************/
123 /* input/output formats */
127 struct AVFormatContext;
129 /** this structure contains the data a format has to probe a file */
130 typedef struct AVProbeData {
131 const char *filename;
136 #define AVPROBE_SCORE_MAX 100 ///< max score, half of that is used for file extension based detection
137 #define AVPROBE_PADDING_SIZE 32 ///< extra allocated bytes at the end of the probe buffer
139 typedef struct AVFormatParameters {
140 AVRational time_base;
145 enum PixelFormat pix_fmt;
146 int channel; /**< used to select dv channel */
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 #if LIBAVFORMAT_VERSION_INT < (53<<16)
156 enum CodecID video_codec_id;
157 enum CodecID audio_codec_id;
159 } AVFormatParameters;
161 //! demuxer will use url_fopen, no opened file should be provided by the caller
162 #define AVFMT_NOFILE 0x0001
163 #define AVFMT_NEEDNUMBER 0x0002 /**< needs '%d' in filename */
164 #define AVFMT_SHOW_IDS 0x0008 /**< show format stream IDs numbers */
165 #define AVFMT_RAWPICTURE 0x0020 /**< format wants AVPicture structure for
167 #define AVFMT_GLOBALHEADER 0x0040 /**< format wants global header */
168 #define AVFMT_NOTIMESTAMPS 0x0080 /**< format does not need / have any timestamps */
169 #define AVFMT_GENERIC_INDEX 0x0100 /**< use generic index building code */
171 typedef struct AVOutputFormat {
173 const char *long_name;
174 const char *mime_type;
175 const char *extensions; /**< comma separated filename extensions */
176 /** size of private data so that it can be allocated in the wrapper */
179 enum CodecID audio_codec; /**< default audio codec */
180 enum CodecID video_codec; /**< default video codec */
181 int (*write_header)(struct AVFormatContext *);
182 int (*write_packet)(struct AVFormatContext *, AVPacket *pkt);
183 int (*write_trailer)(struct AVFormatContext *);
184 /** can use flags: AVFMT_NOFILE, AVFMT_NEEDNUMBER, AVFMT_GLOBALHEADER */
186 /** currently only used to set pixel format if not YUV420P */
187 int (*set_parameters)(struct AVFormatContext *, AVFormatParameters *);
188 int (*interleave_packet)(struct AVFormatContext *, AVPacket *out, AVPacket *in, int flush);
191 * list of supported codec_id-codec_tag pairs, ordered by "better choice first"
192 * the arrays are all CODEC_ID_NONE terminated
194 const struct AVCodecTag **codec_tag;
196 enum CodecID subtitle_codec; /**< default subtitle codec */
199 struct AVOutputFormat *next;
202 typedef struct AVInputFormat {
204 const char *long_name;
205 /** size of private data so that it can be allocated in the wrapper */
208 * Tell if a given file has a chance of being parsed by this format.
209 * The buffer provided is guaranteed to be AVPROBE_PADDING_SIZE bytes
210 * big so you do not have to check for that unless you need more.
212 int (*read_probe)(AVProbeData *);
213 /** read the format header and initialize the AVFormatContext
214 structure. Return 0 if OK. 'ap' if non NULL contains
215 additional paramters. Only used in raw format right
216 now. 'av_new_stream' should be called to create new streams. */
217 int (*read_header)(struct AVFormatContext *,
218 AVFormatParameters *ap);
219 /** read one packet and put it in 'pkt'. pts and flags are also
220 set. 'av_new_stream' can be called only if the flag
221 AVFMTCTX_NOHEADER is used. */
222 int (*read_packet)(struct AVFormatContext *, AVPacket *pkt);
223 /** close the stream. The AVFormatContext and AVStreams are not
224 freed by this function */
225 int (*read_close)(struct AVFormatContext *);
227 * seek to a given timestamp relative to the frames in
228 * stream component stream_index
229 * @param stream_index must not be -1
230 * @param flags selects which direction should be preferred if no exact
232 * @return >= 0 on success (but not necessarily the new offset)
234 int (*read_seek)(struct AVFormatContext *,
235 int stream_index, int64_t timestamp, int flags);
237 * gets the next timestamp in stream[stream_index].time_base units.
238 * @return the timestamp or AV_NOPTS_VALUE if an error occurred
240 int64_t (*read_timestamp)(struct AVFormatContext *s, int stream_index,
241 int64_t *pos, int64_t pos_limit);
242 /** can use flags: AVFMT_NOFILE, AVFMT_NEEDNUMBER */
244 /** if extensions are defined, then no probe is done. You should
245 usually not use extension format guessing because it is not
247 const char *extensions;
248 /** general purpose read only value that the format can use */
251 /** start/resume playing - only meaningful if using a network based format
253 int (*read_play)(struct AVFormatContext *);
255 /** pause playing - only meaningful if using a network based format
257 int (*read_pause)(struct AVFormatContext *);
259 const struct AVCodecTag **codec_tag;
262 struct AVInputFormat *next;
265 enum AVStreamParseType {
267 AVSTREAM_PARSE_FULL, /**< full parsing and repack */
268 AVSTREAM_PARSE_HEADERS, /**< only parse headers, don't repack */
269 AVSTREAM_PARSE_TIMESTAMPS, /**< full parsing and interpolation of timestamps for frames not starting on packet boundary */
272 typedef struct AVIndexEntry {
275 #define AVINDEX_KEYFRAME 0x0001
277 int size:30; //Yeah, trying to keep the size of this small to reduce memory requirements (it is 24 vs 32 byte due to possible 8byte align).
278 int min_distance; /**< min distance between this and the previous keyframe, used to avoid unneeded searching */
281 #define AV_DISPOSITION_DEFAULT 0x0001
282 #define AV_DISPOSITION_DUB 0x0002
283 #define AV_DISPOSITION_ORIGINAL 0x0004
284 #define AV_DISPOSITION_COMMENT 0x0008
285 #define AV_DISPOSITION_LYRICS 0x0010
286 #define AV_DISPOSITION_KARAOKE 0x0020
290 * New fields can be added to the end with minor version bumps.
291 * Removal, reordering and changes to existing fields require a major
293 * sizeof(AVStream) must not be used outside libav*.
295 typedef struct AVStream {
296 int index; /**< stream index in AVFormatContext */
297 int id; /**< format specific stream id */
298 AVCodecContext *codec; /**< codec context */
300 * Real base frame rate of the stream.
301 * This is the lowest frame rate with which all timestamps can be
302 * represented accurately (it is the least common multiple of all
303 * frame rates in the stream), Note, this value is just a guess!
304 * For example if the timebase is 1/90000 and all frames have either
305 * approximately 3600 or 1800 timer ticks then r_frame_rate will be 50/1.
307 AVRational r_frame_rate;
310 /* internal data used in av_find_stream_info() */
312 /** encoding: PTS generation when outputing stream */
316 * This is the fundamental unit of time (in seconds) in terms
317 * of which frame timestamps are represented. For fixed-fps content,
318 * timebase should be 1/frame rate and timestamp increments should be
321 AVRational time_base;
322 int pts_wrap_bits; /**< number of bits in pts (used for wrapping control) */
323 /* ffmpeg.c private use */
324 int stream_copy; /**< if set, just copy stream */
325 enum AVDiscard discard; ///< selects which packets can be discarded at will and do not need to be demuxed
326 //FIXME move stuff to a flags field?
327 /** quality, as it has been removed from AVCodecContext and put in AVVideoFrame
328 * MN: dunno if that is the right place for it */
331 * Decoding: pts of the first frame of the stream, in stream time base.
332 * Only set this if you are absolutely 100% sure that the value you set
333 * it to really is the pts of the first frame.
334 * This may be undefined (AV_NOPTS_VALUE).
335 * @note The ASF header does NOT contain a correct start_time the ASF
336 * demuxer must NOT set this.
340 * Decoding: duration of the stream, in stream time base.
341 * If a source file does not specify a duration, but does specify
342 * a bitrate, this value will be estimates from bit rate and file size.
346 char language[4]; /** ISO 639 3-letter language code (empty string if undefined) */
348 /* av_read_frame() support */
349 enum AVStreamParseType need_parsing;
350 struct AVCodecParserContext *parser;
353 int last_IP_duration;
355 /* av_seek_frame() support */
356 AVIndexEntry *index_entries; /**< only used if the format does not
357 support seeking natively */
358 int nb_index_entries;
359 unsigned int index_entries_allocated_size;
361 int64_t nb_frames; ///< number of frames in this stream if known or 0
363 #define MAX_REORDER_DELAY 4
364 int64_t pts_buffer[MAX_REORDER_DELAY+1];
366 char *filename; /**< source filename of the stream */
368 int disposition; /**< AV_DISPOSITION_* bitfield */
371 #define AV_PROGRAM_RUNNING 1
374 * New fields can be added to the end with minor version bumps.
375 * Removal, reordering and changes to existing fields require a major
377 * sizeof(AVProgram) must not be used outside libav*.
379 typedef struct AVProgram {
381 char *provider_name; ///< Network name for DVB streams
382 char *name; ///< Service name for DVB streams
384 enum AVDiscard discard; ///< selects which program to discard and which to feed to the caller
385 unsigned int *stream_index;
386 unsigned int nb_stream_indexes;
389 #define AVFMTCTX_NOHEADER 0x0001 /**< signal that no header is present
390 (streams are added dynamically) */
392 typedef struct AVChapter {
393 int id; ///< Unique id to identify the chapter
394 AVRational time_base; ///< Timebase in which the start/end timestamps are specified
395 int64_t start, end; ///< chapter start/end time in AV_TIME_BASE units
396 char *title; ///< chapter title
399 #define MAX_STREAMS 20
402 * format I/O context.
403 * New fields can be added to the end with minor version bumps.
404 * Removal, reordering and changes to existing fields require a major
406 * sizeof(AVFormatContext) must not be used outside libav*.
408 typedef struct AVFormatContext {
409 const AVClass *av_class; /**< set by av_alloc_format_context */
410 /* can only be iformat or oformat, not both at the same time */
411 struct AVInputFormat *iformat;
412 struct AVOutputFormat *oformat;
415 unsigned int nb_streams;
416 AVStream *streams[MAX_STREAMS];
417 char filename[1024]; /**< input or output filename */
425 int year; /**< ID3 year, 0 if none */
426 int track; /**< track number, 0 if none */
427 char genre[32]; /**< ID3 genre */
429 int ctx_flags; /**< format specific flags, see AVFMTCTX_xx */
430 /* private data for pts handling (do not modify directly) */
431 /** This buffer is only needed when packets were already buffered but
432 not decoded, for example to get the codec parameters in mpeg
434 struct AVPacketList *packet_buffer;
436 /** decoding: position of the first frame of the component, in
437 AV_TIME_BASE fractional seconds. NEVER set this value directly:
438 it is deduced from the AVStream values. */
440 /** decoding: duration of the stream, in AV_TIME_BASE fractional
441 seconds. NEVER set this value directly: it is deduced from the
444 /** decoding: total file size. 0 if unknown */
446 /** decoding: total stream bitrate in bit/s, 0 if not
447 available. Never set it directly if the file_size and the
448 duration are known as ffmpeg can compute it automatically. */
451 /* av_read_frame() support */
453 const uint8_t *cur_ptr;
457 /* av_seek_frame() support */
458 int64_t data_offset; /** offset of the first packet */
466 #define AVFMT_NOOUTPUTLOOP -1
467 #define AVFMT_INFINITEOUTPUTLOOP 0
468 /** number of times to loop output in formats that support it */
472 #define AVFMT_FLAG_GENPTS 0x0001 ///< generate pts if missing even if it requires parsing future frames
473 #define AVFMT_FLAG_IGNIDX 0x0002 ///< ignore index
474 #define AVFMT_FLAG_NONBLOCK 0x0004 ///< do not block when reading packets from input
477 /** decoding: size of data to probe; encoding unused */
478 unsigned int probesize;
481 * maximum duration in AV_TIME_BASE units over which the input should be analyzed in av_find_stream_info()
483 int max_analyze_duration;
488 unsigned int nb_programs;
489 AVProgram **programs;
492 * Forced video codec_id.
493 * demuxing: set by user
495 enum CodecID video_codec_id;
497 * Forced audio codec_id.
498 * demuxing: set by user
500 enum CodecID audio_codec_id;
502 * Forced subtitle codec_id.
503 * demuxing: set by user
505 enum CodecID subtitle_codec_id;
508 * Maximum amount of memory in bytes to use per stream for the index.
509 * If the needed index exceeds this size entries will be discarded as
510 * needed to maintain a smaller size. This can lead to slower or less
511 * accurate seeking (depends on demuxer).
512 * Demuxers for which a full in memory index is mandatory will ignore
515 * demuxing: set by user
517 unsigned int max_index_size;
520 * Maximum amount of memory in bytes to use for buffering frames
521 * obtained from real-time capture devices.
523 unsigned int max_picture_buffer;
526 AVChapter **chapters;
529 typedef struct AVPacketList {
531 struct AVPacketList *next;
534 #if LIBAVFORMAT_VERSION_INT < (53<<16)
535 extern AVInputFormat *first_iformat;
536 extern AVOutputFormat *first_oformat;
539 AVInputFormat *av_iformat_next(AVInputFormat *f);
540 AVOutputFormat *av_oformat_next(AVOutputFormat *f);
542 enum CodecID av_guess_image2_codec(const char *filename);
544 /* XXX: use automatic init with either ELF sections or C file parser */
548 void av_register_input_format(AVInputFormat *format);
549 void av_register_output_format(AVOutputFormat *format);
550 AVOutputFormat *guess_stream_format(const char *short_name,
551 const char *filename, const char *mime_type);
552 AVOutputFormat *guess_format(const char *short_name,
553 const char *filename, const char *mime_type);
556 * Guesses the codec id based upon muxer and filename.
558 enum CodecID av_guess_codec(AVOutputFormat *fmt, const char *short_name,
559 const char *filename, const char *mime_type, enum CodecType type);
562 * Send a nice hexadecimal dump of a buffer to the specified file stream.
564 * @param f The file stream pointer where the dump should be sent to.
566 * @param size buffer size
568 * @see av_hex_dump_log, av_pkt_dump, av_pkt_dump_log
570 void av_hex_dump(FILE *f, uint8_t *buf, int size);
573 * Send a nice hexadecimal dump of a buffer to the log.
575 * @param avcl A pointer to an arbitrary struct of which the first field is a
576 * pointer to an AVClass struct.
577 * @param level The importance level of the message, lower values signifying
580 * @param size buffer size
582 * @see av_hex_dump, av_pkt_dump, av_pkt_dump_log
584 void av_hex_dump_log(void *avcl, int level, uint8_t *buf, int size);
587 * Send a nice dump of a packet to the specified file stream.
589 * @param f The file stream pointer where the dump should be sent to.
590 * @param pkt packet to dump
591 * @param dump_payload true if the payload must be displayed too
593 void av_pkt_dump(FILE *f, AVPacket *pkt, int dump_payload);
596 * Send a nice dump of a packet to the log.
598 * @param avcl A pointer to an arbitrary struct of which the first field is a
599 * pointer to an AVClass struct.
600 * @param level The importance level of the message, lower values signifying
602 * @param pkt packet to dump
603 * @param dump_payload true if the payload must be displayed too
605 void av_pkt_dump_log(void *avcl, int level, AVPacket *pkt, int dump_payload);
607 void av_register_all(void);
609 /** codec tag <-> codec id */
610 enum CodecID av_codec_get_id(const struct AVCodecTag **tags, unsigned int tag);
611 unsigned int av_codec_get_tag(const struct AVCodecTag **tags, enum CodecID id);
613 /* media file input */
616 * finds AVInputFormat based on input format's short name.
618 AVInputFormat *av_find_input_format(const char *short_name);
623 * @param is_opened whether the file is already opened, determines whether
624 * demuxers with or without AVFMT_NOFILE are probed
626 AVInputFormat *av_probe_input_format(AVProbeData *pd, int is_opened);
629 * Allocates all the structures needed to read an input stream.
630 * This does not open the needed codecs for decoding the stream[s].
632 int av_open_input_stream(AVFormatContext **ic_ptr,
633 ByteIOContext *pb, const char *filename,
634 AVInputFormat *fmt, AVFormatParameters *ap);
637 * Open a media file as input. The codecs are not opened. Only the file
638 * header (if present) is read.
640 * @param ic_ptr the opened media file handle is put here
641 * @param filename filename to open.
642 * @param fmt if non NULL, force the file format to use
643 * @param buf_size optional buffer size (zero if default is OK)
644 * @param ap additional parameters needed when opening the file (NULL if default)
645 * @return 0 if OK. AVERROR_xxx otherwise.
647 int av_open_input_file(AVFormatContext **ic_ptr, const char *filename,
650 AVFormatParameters *ap);
652 * Allocate an AVFormatContext.
653 * Can be freed with av_free() but do not forget to free everything you
654 * explicitly allocated as well!
656 AVFormatContext *av_alloc_format_context(void);
659 * Read packets of a media file to get stream information. This
660 * is useful for file formats with no headers such as MPEG. This
661 * function also computes the real frame rate in case of mpeg2 repeat
663 * The logical file position is not changed by this function;
664 * examined packets may be buffered for later processing.
666 * @param ic media file handle
667 * @return >=0 if OK. AVERROR_xxx if error.
668 * @todo Let user decide somehow what information is needed so we do not waste time getting stuff the user does not need.
670 int av_find_stream_info(AVFormatContext *ic);
673 * Read a transport packet from a media file.
675 * This function is obsolete and should never be used.
676 * Use av_read_frame() instead.
678 * @param s media file handle
679 * @param pkt is filled
680 * @return 0 if OK. AVERROR_xxx if error.
682 int av_read_packet(AVFormatContext *s, AVPacket *pkt);
685 * Return the next frame of a stream.
687 * The returned packet is valid
688 * until the next av_read_frame() or until av_close_input_file() and
689 * must be freed with av_free_packet. For video, the packet contains
690 * exactly one frame. For audio, it contains an integer number of
691 * frames if each frame has a known fixed size (e.g. PCM or ADPCM
692 * data). If the audio frames have a variable size (e.g. MPEG audio),
693 * then it contains one frame.
695 * pkt->pts, pkt->dts and pkt->duration are always set to correct
696 * values in AVStream.timebase units (and guessed if the format cannot
697 * provided them). pkt->pts can be AV_NOPTS_VALUE if the video format
698 * has B frames, so it is better to rely on pkt->dts if you do not
699 * decompress the payload.
701 * @return 0 if OK, < 0 if error or end of file.
703 int av_read_frame(AVFormatContext *s, AVPacket *pkt);
706 * Seek to the key frame at timestamp.
707 * 'timestamp' in 'stream_index'.
708 * @param stream_index If stream_index is (-1), a default
709 * stream is selected, and timestamp is automatically converted
710 * from AV_TIME_BASE units to the stream specific time_base.
711 * @param timestamp timestamp in AVStream.time_base units
712 * or if there is no stream specified then in AV_TIME_BASE units
713 * @param flags flags which select direction and seeking mode
714 * @return >= 0 on success
716 int av_seek_frame(AVFormatContext *s, int stream_index, int64_t timestamp, int flags);
719 * start playing a network based stream (e.g. RTSP stream) at the
722 int av_read_play(AVFormatContext *s);
725 * Pause a network based stream (e.g. RTSP stream).
727 * Use av_read_play() to resume it.
729 int av_read_pause(AVFormatContext *s);
732 * Free a AVFormatContext allocated by av_open_input_stream.
733 * @param s context to free
735 void av_close_input_stream(AVFormatContext *s);
738 * Close a media file (but not its codecs).
740 * @param s media file handle
742 void av_close_input_file(AVFormatContext *s);
745 * Add a new stream to a media file.
747 * Can only be called in the read_header() function. If the flag
748 * AVFMTCTX_NOHEADER is in the format context, then new streams
749 * can be added in read_packet too.
751 * @param s media file handle
752 * @param id file format dependent stream id
754 AVStream *av_new_stream(AVFormatContext *s, int id);
755 AVProgram *av_new_program(AVFormatContext *s, int id);
759 * This function is NOT part of the public API
760 * and should be ONLY used by demuxers.
762 * @param s media file handle
763 * @param start chapter start time in AV_TIME_BASE units
764 * @param end chapter end time in AV_TIME_BASE units
765 * @param title chapter title
767 int ff_new_chapter(AVFormatContext *s, int64_t start, int64_t end, const char *title);
770 * Set the pts for a given stream.
773 * @param pts_wrap_bits number of bits effectively used by the pts
774 * (used for wrap control, 33 is the value for MPEG)
775 * @param pts_num numerator to convert to seconds (MPEG: 1)
776 * @param pts_den denominator to convert to seconds (MPEG: 90000)
778 void av_set_pts_info(AVStream *s, int pts_wrap_bits,
779 int pts_num, int pts_den);
781 #define AVSEEK_FLAG_BACKWARD 1 ///< seek backward
782 #define AVSEEK_FLAG_BYTE 2 ///< seeking based on position in bytes
783 #define AVSEEK_FLAG_ANY 4 ///< seek to any frame, even non keyframes
785 int av_find_default_stream_index(AVFormatContext *s);
788 * Gets the index for a specific timestamp.
789 * @param flags if AVSEEK_FLAG_BACKWARD then the returned index will correspond to
790 * the timestamp which is <= the requested one, if backward is 0
792 * if AVSEEK_FLAG_ANY seek to any frame, only keyframes otherwise
793 * @return < 0 if no such timestamp could be found
795 int av_index_search_timestamp(AVStream *st, int64_t timestamp, int flags);
798 * Ensures the index uses less memory than the maximum specified in
799 * AVFormatContext.max_index_size, by discarding entries if it grows
801 * This function is not part of the public API and should only be called
804 void ff_reduce_index(AVFormatContext *s, int stream_index);
807 * Add a index entry into a sorted list updateing if it is already there.
809 * @param timestamp timestamp in the timebase of the given stream
811 int av_add_index_entry(AVStream *st,
812 int64_t pos, int64_t timestamp, int size, int distance, int flags);
815 * Does a binary search using av_index_search_timestamp() and AVCodec.read_timestamp().
816 * This is not supposed to be called directly by a user application, but by demuxers.
817 * @param target_ts target timestamp in the time base of the given stream
818 * @param stream_index stream number
820 int av_seek_frame_binary(AVFormatContext *s, int stream_index, int64_t target_ts, int flags);
823 * Updates cur_dts of all streams based on given timestamp and AVStream.
825 * Stream ref_st unchanged, others set cur_dts in their native timebase
826 * only needed for timestamp wrapping or if (dts not set and pts!=dts).
827 * @param timestamp new dts expressed in time_base of param ref_st
828 * @param ref_st reference stream giving time_base of param timestamp
830 void av_update_cur_dts(AVFormatContext *s, AVStream *ref_st, int64_t timestamp);
833 * Does a binary search using read_timestamp().
834 * This is not supposed to be called directly by a user application, but by demuxers.
835 * @param target_ts target timestamp in the time base of the given stream
836 * @param stream_index stream number
838 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 ));
840 /** media file output */
841 int av_set_parameters(AVFormatContext *s, AVFormatParameters *ap);
844 * Allocate the stream private data and write the stream header to an
847 * @param s media file handle
848 * @return 0 if OK. AVERROR_xxx if error.
850 int av_write_header(AVFormatContext *s);
853 * Write a packet to an output media file.
855 * The packet shall contain one audio or video frame.
856 * The packet must be correctly interleaved according to the container specification,
857 * if not then av_interleaved_write_frame must be used
859 * @param s media file handle
860 * @param pkt the packet, which contains the stream_index, buf/buf_size, dts/pts, ...
861 * @return < 0 if error, = 0 if OK, 1 if end of stream wanted.
863 int av_write_frame(AVFormatContext *s, AVPacket *pkt);
866 * Writes a packet to an output media file ensuring correct interleaving.
868 * The packet must contain one audio or video frame.
869 * If the packets are already correctly interleaved the application should
870 * call av_write_frame() instead as it is slightly faster. It is also important
871 * to keep in mind that completely non-interleaved input will need huge amounts
872 * of memory to interleave with this, so it is preferable to interleave at the
875 * @param s media file handle
876 * @param pkt the packet, which contains the stream_index, buf/buf_size, dts/pts, ...
877 * @return < 0 if error, = 0 if OK, 1 if end of stream wanted.
879 int av_interleaved_write_frame(AVFormatContext *s, AVPacket *pkt);
882 * Interleave a packet per DTS in an output media file.
884 * Packets with pkt->destruct == av_destruct_packet will be freed inside this function,
885 * so they cannot be used after it, note calling av_free_packet() on them is still safe.
887 * @param s media file handle
888 * @param out the interleaved packet will be output here
889 * @param in the input packet
890 * @param flush 1 if no further packets are available as input and all
891 * remaining packets should be output
892 * @return 1 if a packet was output, 0 if no packet could be output,
893 * < 0 if an error occurred
895 int av_interleave_packet_per_dts(AVFormatContext *s, AVPacket *out, AVPacket *pkt, int flush);
898 * @brief Write the stream trailer to an output media file and
899 * free the file private data.
901 * @param s media file handle
902 * @return 0 if OK. AVERROR_xxx if error.
904 int av_write_trailer(AVFormatContext *s);
906 void dump_format(AVFormatContext *ic,
912 * parses width and height out of string str.
913 * @deprecated Use av_parse_video_frame_size instead.
915 attribute_deprecated int parse_image_size(int *width_ptr, int *height_ptr, const char *str);
918 * Converts frame rate from string to a fraction.
919 * @deprecated Use av_parse_video_frame_rate instead.
921 attribute_deprecated int parse_frame_rate(int *frame_rate, int *frame_rate_base, const char *arg);
924 * Parses \p datestr and returns a corresponding number of microseconds.
925 * @param datestr String representing a date or a duration.
926 * - If a date the syntax is:
928 * [{YYYY-MM-DD|YYYYMMDD}]{T| }{HH[:MM[:SS[.m...]]][Z]|HH[MM[SS[.m...]]][Z]}
930 * Time is localtime unless Z is appended, in which case it is
931 * interpreted as UTC.
932 * If the year-month-day part isn't specified it takes the current
934 * Returns the number of microseconds since 1st of January, 1970 up to
935 * the time of the parsed date or INT64_MIN if \p datestr cannot be
936 * successfully parsed.
937 * - If a duration the syntax is:
939 * [-]HH[:MM[:SS[.m...]]]
942 * Returns the number of microseconds contained in a time interval
943 * with the specified duration or INT64_MIN if \p datestr cannot be
944 * successfully parsed.
945 * @param duration Flag which tells how to interpret \p datestr, if
946 * not zero \p datestr is interpreted as a duration, otherwise as a
949 int64_t parse_date(const char *datestr, int duration);
951 int64_t av_gettime(void);
953 /* ffm specific for ffserver */
954 #define FFM_PACKET_SIZE 4096
955 offset_t ffm_read_write_index(int fd);
956 void ffm_write_write_index(int fd, offset_t pos);
957 void ffm_set_write_index(AVFormatContext *s, offset_t pos, offset_t file_size);
960 * Attempts to find a specific tag in a URL.
962 * syntax: '?tag1=val1&tag2=val2...'. Little URL decoding is done.
965 int find_info_tag(char *arg, int arg_size, const char *tag1, const char *info);
968 * Returns in 'buf' the path with '%d' replaced by number.
970 * Also handles the '%0nd' format where 'n' is the total number
971 * of digits and '%%'.
973 * @param buf destination buffer
974 * @param buf_size destination buffer size
975 * @param path numbered sequence string
976 * @param number frame number
977 * @return 0 if OK, -1 if format error.
979 int av_get_frame_filename(char *buf, int buf_size,
980 const char *path, int number);
983 * Check whether filename actually is a numbered sequence generator.
985 * @param filename possible numbered sequence string
986 * @return 1 if a valid numbered sequence string, 0 otherwise.
988 int av_filename_number_test(const char *filename);
991 * Generate an SDP for an RTP session.
993 * @param ac array of AVFormatContexts describing the RTP streams. If the
994 * array is composed by only one context, such context can contain
995 * multiple AVStreams (one AVStream per RTP stream). Otherwise,
996 * all the contexts in the array (an AVCodecContext per RTP stream)
997 * must contain only one AVStream
998 * @param n_files number of AVCodecContexts contained in ac
999 * @param buff buffer where the SDP will be stored (must be allocated by
1001 * @param size the size of the buffer
1002 * @return 0 if OK. AVERROR_xxx if error.
1004 int avf_sdp_create(AVFormatContext *ac[], int n_files, char *buff, int size);
1006 #ifdef HAVE_AV_CONFIG_H
1008 void ff_dynarray_add(unsigned long **tab_ptr, int *nb_ptr, unsigned long elem);
1011 #define dynarray_add(tab, nb_ptr, elem)\
1013 typeof(tab) _tab = (tab);\
1014 typeof(elem) _elem = (elem);\
1015 (void)sizeof(**_tab == _elem); /* check that types are compatible */\
1016 ff_dynarray_add((unsigned long **)_tab, nb_ptr, (unsigned long)_elem);\
1019 #define dynarray_add(tab, nb_ptr, elem)\
1021 ff_dynarray_add((unsigned long **)(tab), nb_ptr, (unsigned long)(elem));\
1025 time_t mktimegm(struct tm *tm);
1026 struct tm *brktimegm(time_t secs, struct tm *tm);
1027 const char *small_strptime(const char *p, const char *fmt,
1031 int resolve_host(struct in_addr *sin_addr, const char *hostname);
1033 void url_split(char *proto, int proto_size,
1034 char *authorization, int authorization_size,
1035 char *hostname, int hostname_size,
1037 char *path, int path_size,
1040 int match_ext(const char *filename, const char *extensions);
1042 #endif /* HAVE_AV_CONFIG_H */
1044 #endif /* FFMPEG_AVFORMAT_H */