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 AVFORMAT_AVFORMAT_H
22 #define AVFORMAT_AVFORMAT_H
26 * I return the LIBAVFORMAT_VERSION_INT constant. You got
27 * a fucking problem with that, douchebag?
29 unsigned avformat_version(void);
32 * Return the libavformat build-time configuration.
34 const char *avformat_configuration(void);
37 * Return the libavformat license.
39 const char *avformat_license(void);
42 #include <stdio.h> /* FILE */
43 #include "libavcodec/avcodec.h"
46 #include "libavformat/version.h"
48 struct AVFormatContext;
52 * Public Metadata API.
53 * The metadata API allows libavformat to export metadata tags to a client
54 * application using a sequence of key/value pairs. Like all strings in FFmpeg,
55 * metadata must be stored as UTF-8 encoded Unicode. Note that metadata
56 * exported by demuxers isn't checked to be valid UTF-8 in most cases.
57 * Important concepts to keep in mind:
58 * 1. Keys are unique; there can never be 2 tags with the same key. This is
59 * also meant semantically, i.e., a demuxer should not knowingly produce
60 * several keys that are literally different but semantically identical.
61 * E.g., key=Author5, key=Author6. In this example, all authors must be
62 * placed in the same tag.
63 * 2. Metadata is flat, not hierarchical; there are no subtags. If you
64 * want to store, e.g., the email address of the child of producer Alice
65 * and actor Bob, that could have key=alice_and_bobs_childs_email_address.
66 * 3. Several modifiers can be applied to the tag name. This is done by
67 * appending a dash character ('-') and the modifier name in the order
68 * they appear in the list below -- e.g. foo-eng-sort, not foo-sort-eng.
69 * a) language -- a tag whose value is localized for a particular language
70 * is appended with the ISO 639-2/B 3-letter language code.
71 * For example: Author-ger=Michael, Author-eng=Mike
72 * The original/default language is in the unqualified "Author" tag.
73 * A demuxer should set a default if it sets any translated tag.
74 * b) sorting -- a modified version of a tag that should be used for
75 * sorting will have '-sort' appended. E.g. artist="The Beatles",
76 * artist-sort="Beatles, The".
78 * 4. Demuxers attempt to export metadata in a generic format, however tags
79 * with no generic equivalents are left as they are stored in the container.
80 * Follows a list of generic tag names:
82 * album -- name of the set this work belongs to
83 * album_artist -- main creator of the set/album, if different from artist.
84 * e.g. "Various Artists" for compilation albums.
85 * artist -- main creator of the work
86 * comment -- any additional description of the file.
87 * composer -- who composed the work, if different from artist.
88 * copyright -- name of copyright holder.
89 * creation_time-- date when the file was created, preferably in ISO 8601.
90 * date -- date when the work was created, preferably in ISO 8601.
91 * disc -- number of a subset, e.g. disc in a multi-disc collection.
92 * encoder -- name/settings of the software/hardware that produced the file.
93 * encoded_by -- person/group who created the file.
94 * filename -- original name of the file.
95 * genre -- <self-evident>.
96 * language -- main language in which the work is performed, preferably
97 * in ISO 639-2 format.
98 * performer -- artist who performed the work, if different from artist.
99 * E.g for "Also sprach Zarathustra", artist would be "Richard
100 * Strauss" and performer "London Philharmonic Orchestra".
101 * publisher -- name of the label/publisher.
102 * service_name -- name of the service in broadcasting (channel name).
103 * service_provider -- name of the service provider in broadcasting.
104 * title -- name of the work.
105 * track -- number of this work in the set, can be in form current/total.
108 #define AV_METADATA_MATCH_CASE 1
109 #define AV_METADATA_IGNORE_SUFFIX 2
110 #define AV_METADATA_DONT_STRDUP_KEY 4
111 #define AV_METADATA_DONT_STRDUP_VAL 8
112 #define AV_METADATA_DONT_OVERWRITE 16 ///< Don't overwrite existing tags.
119 typedef struct AVMetadata AVMetadata;
120 #if FF_API_OLD_METADATA
121 typedef struct AVMetadataConv AVMetadataConv;
125 * Get a metadata element with matching key.
127 * @param prev Set to the previous matching element to find the next.
128 * If set to NULL the first matching element is returned.
129 * @param flags Allows case as well as suffix-insensitive comparisons.
130 * @return Found tag or NULL, changing key or value leads to undefined behavior.
133 av_metadata_get(AVMetadata *m, const char *key, const AVMetadataTag *prev, int flags);
135 #if FF_API_OLD_METADATA
137 * Set the given tag in *pm, overwriting an existing tag.
139 * @param pm pointer to a pointer to a metadata struct. If *pm is NULL
140 * a metadata struct is allocated and put in *pm.
141 * @param key tag key to add to *pm (will be av_strduped)
142 * @param value tag value to add to *pm (will be av_strduped)
143 * @return >= 0 on success otherwise an error code <0
144 * @deprecated Use av_metadata_set2() instead.
146 attribute_deprecated int av_metadata_set(AVMetadata **pm, const char *key, const char *value);
150 * Set the given tag in *pm, overwriting an existing tag.
152 * @param pm pointer to a pointer to a metadata struct. If *pm is NULL
153 * a metadata struct is allocated and put in *pm.
154 * @param key tag key to add to *pm (will be av_strduped depending on flags)
155 * @param value tag value to add to *pm (will be av_strduped depending on flags).
156 * Passing a NULL value will cause an existing tag to be deleted.
157 * @return >= 0 on success otherwise an error code <0
159 int av_metadata_set2(AVMetadata **pm, const char *key, const char *value, int flags);
161 #if FF_API_OLD_METADATA
163 * This function is provided for compatibility reason and currently does nothing.
165 attribute_deprecated void av_metadata_conv(struct AVFormatContext *ctx, const AVMetadataConv *d_conv,
166 const AVMetadataConv *s_conv);
170 * Copy metadata from one AVMetadata struct into another.
171 * @param dst pointer to a pointer to a AVMetadata struct. If *dst is NULL,
172 * this function will allocate a struct for you and put it in *dst
173 * @param src pointer to source AVMetadata struct
174 * @param flags flags to use when setting metadata in *dst
175 * @note metadata is read using the AV_METADATA_IGNORE_SUFFIX flag
177 void av_metadata_copy(AVMetadata **dst, AVMetadata *src, int flags);
180 * Free all the memory allocated for an AVMetadata struct.
182 void av_metadata_free(AVMetadata **m);
185 /* packet functions */
189 * Allocate and read the payload of a packet and initialize its
190 * fields with default values.
193 * @param size desired payload size
194 * @return >0 (read size) if OK, AVERROR_xxx otherwise
196 int av_get_packet(ByteIOContext *s, AVPacket *pkt, int size);
200 * Read data and append it to the current content of the AVPacket.
201 * If pkt->size is 0 this is identical to av_get_packet.
202 * Note that this uses av_grow_packet and thus involves a realloc
203 * which is inefficient. Thus this function should only be used
204 * when there is no reasonable way to know (an upper bound of)
208 * @param size amount of data to read
209 * @return >0 (read size) if OK, AVERROR_xxx otherwise, previous data
210 * will not be lost even if an error occurs.
212 int av_append_packet(ByteIOContext *s, AVPacket *pkt, int size);
214 /*************************************************/
215 /* fractional numbers for exact pts handling */
218 * The exact value of the fractional number is: 'val + num / den'.
219 * num is assumed to be 0 <= num < den.
221 typedef struct AVFrac {
222 int64_t val, num, den;
225 /*************************************************/
226 /* input/output formats */
231 * This structure contains the data a format has to probe a file.
233 typedef struct AVProbeData {
234 const char *filename;
235 unsigned char *buf; /**< Buffer must have AVPROBE_PADDING_SIZE of extra allocated bytes filled with zero. */
236 int buf_size; /**< Size of buf except extra allocated bytes */
239 #define AVPROBE_SCORE_MAX 100 ///< maximum score, half of that is used for file-extension-based detection
240 #define AVPROBE_PADDING_SIZE 32 ///< extra allocated bytes at the end of the probe buffer
242 typedef struct AVFormatParameters {
243 AVRational time_base;
248 enum PixelFormat pix_fmt;
249 int channel; /**< Used to select DV channel. */
250 const char *standard; /**< TV standard, NTSC, PAL, SECAM */
251 unsigned int mpeg2ts_raw:1; /**< Force raw MPEG-2 transport stream output, if possible. */
252 unsigned int mpeg2ts_compute_pcr:1; /**< Compute exact PCR for each transport
253 stream packet (only meaningful if
254 mpeg2ts_raw is TRUE). */
255 unsigned int initial_pause:1; /**< Do not begin to play the stream
256 immediately (RTSP only). */
257 unsigned int prealloced_context:1;
258 #if FF_API_PARAMETERS_CODEC_ID
259 attribute_deprecated enum CodecID video_codec_id;
260 attribute_deprecated enum CodecID audio_codec_id;
262 } AVFormatParameters;
264 //! Demuxer will use url_fopen, no opened file should be provided by the caller.
265 #define AVFMT_NOFILE 0x0001
266 #define AVFMT_NEEDNUMBER 0x0002 /**< Needs '%d' in filename. */
267 #define AVFMT_SHOW_IDS 0x0008 /**< Show format stream IDs numbers. */
268 #define AVFMT_RAWPICTURE 0x0020 /**< Format wants AVPicture structure for
270 #define AVFMT_GLOBALHEADER 0x0040 /**< Format wants global header. */
271 #define AVFMT_NOTIMESTAMPS 0x0080 /**< Format does not need / have any timestamps. */
272 #define AVFMT_GENERIC_INDEX 0x0100 /**< Use generic index building code. */
273 #define AVFMT_TS_DISCONT 0x0200 /**< Format allows timestamp discontinuities. Note, muxers always require valid (monotone) timestamps */
274 #define AVFMT_VARIABLE_FPS 0x0400 /**< Format allows variable fps. */
275 #define AVFMT_NODIMENSIONS 0x0800 /**< Format does not need width/height */
276 #define AVFMT_NOSTREAMS 0x1000 /**< Format does not require any streams */
278 typedef struct AVOutputFormat {
281 * Descriptive name for the format, meant to be more human-readable
282 * than name. You should use the NULL_IF_CONFIG_SMALL() macro
285 const char *long_name;
286 const char *mime_type;
287 const char *extensions; /**< comma-separated filename extensions */
289 * size of private data so that it can be allocated in the wrapper
293 enum CodecID audio_codec; /**< default audio codec */
294 enum CodecID video_codec; /**< default video codec */
295 int (*write_header)(struct AVFormatContext *);
296 int (*write_packet)(struct AVFormatContext *, AVPacket *pkt);
297 int (*write_trailer)(struct AVFormatContext *);
299 * can use flags: AVFMT_NOFILE, AVFMT_NEEDNUMBER, AVFMT_GLOBALHEADER
303 * Currently only used to set pixel format if not YUV420P.
305 int (*set_parameters)(struct AVFormatContext *, AVFormatParameters *);
306 int (*interleave_packet)(struct AVFormatContext *, AVPacket *out,
307 AVPacket *in, int flush);
310 * List of supported codec_id-codec_tag pairs, ordered by "better
311 * choice first". The arrays are all terminated by CODEC_ID_NONE.
313 const struct AVCodecTag * const *codec_tag;
315 enum CodecID subtitle_codec; /**< default subtitle codec */
317 #if FF_API_OLD_METADATA
318 const AVMetadataConv *metadata_conv;
321 const AVClass *priv_class; ///< AVClass for the private context
324 struct AVOutputFormat *next;
327 typedef struct AVInputFormat {
329 * A comma separated list of short names for the format. New names
330 * may be appended with a minor bump.
335 * Descriptive name for the format, meant to be more human-readable
336 * than name. You should use the NULL_IF_CONFIG_SMALL() macro
339 const char *long_name;
342 * Size of private data so that it can be allocated in the wrapper.
347 * Tell if a given file has a chance of being parsed as this format.
348 * The buffer provided is guaranteed to be AVPROBE_PADDING_SIZE bytes
349 * big so you do not have to check for that unless you need more.
351 int (*read_probe)(AVProbeData *);
354 * Read the format header and initialize the AVFormatContext
355 * structure. Return 0 if OK. 'ap' if non-NULL contains
356 * additional parameters. Only used in raw format right
357 * now. 'av_new_stream' should be called to create new streams.
359 int (*read_header)(struct AVFormatContext *,
360 AVFormatParameters *ap);
363 * Read one packet and put it in 'pkt'. pts and flags are also
364 * set. 'av_new_stream' can be called only if the flag
365 * AVFMTCTX_NOHEADER is used and only in the calling thread (not in a
366 * background thread).
367 * @return 0 on success, < 0 on error.
368 * When returning an error, pkt must not have been allocated
369 * or must be freed before returning
371 int (*read_packet)(struct AVFormatContext *, AVPacket *pkt);
374 * Close the stream. The AVFormatContext and AVStreams are not
375 * freed by this function
377 int (*read_close)(struct AVFormatContext *);
381 * Seek to a given timestamp relative to the frames in
382 * stream component stream_index.
383 * @param stream_index Must not be -1.
384 * @param flags Selects which direction should be preferred if no exact
385 * match is available.
386 * @return >= 0 on success (but not necessarily the new offset)
388 attribute_deprecated int (*read_seek)(struct AVFormatContext *,
389 int stream_index, int64_t timestamp, int flags);
392 * Gets the next timestamp in stream[stream_index].time_base units.
393 * @return the timestamp or AV_NOPTS_VALUE if an error occurred
395 int64_t (*read_timestamp)(struct AVFormatContext *s, int stream_index,
396 int64_t *pos, int64_t pos_limit);
399 * Can use flags: AVFMT_NOFILE, AVFMT_NEEDNUMBER.
404 * If extensions are defined, then no probe is done. You should
405 * usually not use extension format guessing because it is not
408 const char *extensions;
411 * General purpose read-only value that the format can use.
416 * Start/resume playing - only meaningful if using a network-based format
419 int (*read_play)(struct AVFormatContext *);
422 * Pause playing - only meaningful if using a network-based format
425 int (*read_pause)(struct AVFormatContext *);
427 const struct AVCodecTag * const *codec_tag;
430 * Seek to timestamp ts.
431 * Seeking will be done so that the point from which all active streams
432 * can be presented successfully will be closest to ts and within min/max_ts.
433 * Active streams are all streams that have AVStream.discard < AVDISCARD_ALL.
435 int (*read_seek2)(struct AVFormatContext *s, int stream_index, int64_t min_ts, int64_t ts, int64_t max_ts, int flags);
437 #if FF_API_OLD_METADATA
438 const AVMetadataConv *metadata_conv;
442 struct AVInputFormat *next;
445 enum AVStreamParseType {
447 AVSTREAM_PARSE_FULL, /**< full parsing and repack */
448 AVSTREAM_PARSE_HEADERS, /**< Only parse headers, do not repack. */
449 AVSTREAM_PARSE_TIMESTAMPS, /**< full parsing and interpolation of timestamps for frames not starting on a packet boundary */
450 AVSTREAM_PARSE_FULL_ONCE, /**< full parsing and repack of the first frame only, only implemented for H.264 currently */
453 typedef struct AVIndexEntry {
456 #define AVINDEX_KEYFRAME 0x0001
458 int size:30; //Yeah, trying to keep the size of this small to reduce memory requirements (it is 24 vs. 32 bytes due to possible 8-byte alignment).
459 int min_distance; /**< Minimum distance between this and the previous keyframe, used to avoid unneeded searching. */
462 #define AV_DISPOSITION_DEFAULT 0x0001
463 #define AV_DISPOSITION_DUB 0x0002
464 #define AV_DISPOSITION_ORIGINAL 0x0004
465 #define AV_DISPOSITION_COMMENT 0x0008
466 #define AV_DISPOSITION_LYRICS 0x0010
467 #define AV_DISPOSITION_KARAOKE 0x0020
470 * Track should be used during playback by default.
471 * Useful for subtitle track that should be displayed
472 * even when user did not explicitly ask for subtitles.
474 #define AV_DISPOSITION_FORCED 0x0040
475 #define AV_DISPOSITION_HEARING_IMPAIRED 0x0080 /**< stream for hearing impaired audiences */
476 #define AV_DISPOSITION_VISUAL_IMPAIRED 0x0100 /**< stream for visual impaired audiences */
480 * New fields can be added to the end with minor version bumps.
481 * Removal, reordering and changes to existing fields require a major
483 * sizeof(AVStream) must not be used outside libav*.
485 typedef struct AVStream {
486 int index; /**< stream index in AVFormatContext */
487 int id; /**< format-specific stream ID */
488 AVCodecContext *codec; /**< codec context */
490 * Real base framerate of the stream.
491 * This is the lowest framerate with which all timestamps can be
492 * represented accurately (it is the least common multiple of all
493 * framerates in the stream). Note, this value is just a guess!
494 * For example, if the time base is 1/90000 and all frames have either
495 * approximately 3600 or 1800 timer ticks, then r_frame_rate will be 50/1.
497 AVRational r_frame_rate;
500 /* internal data used in av_find_stream_info() */
504 * encoding: pts generation when outputting stream
509 * This is the fundamental unit of time (in seconds) in terms
510 * of which frame timestamps are represented. For fixed-fps content,
511 * time base should be 1/framerate and timestamp increments should be 1.
512 * decoding: set by libavformat
513 * encoding: set by libavformat in av_write_header
515 AVRational time_base;
516 int pts_wrap_bits; /**< number of bits in pts (used for wrapping control) */
517 /* ffmpeg.c private use */
518 int stream_copy; /**< If set, just copy stream. */
519 enum AVDiscard discard; ///< Selects which packets can be discarded at will and do not need to be demuxed.
521 //FIXME move stuff to a flags field?
523 * Quality, as it has been removed from AVCodecContext and put in AVVideoFrame.
524 * MN: dunno if that is the right place for it
529 * Decoding: pts of the first frame of the stream, in stream time base.
530 * Only set this if you are absolutely 100% sure that the value you set
531 * it to really is the pts of the first frame.
532 * This may be undefined (AV_NOPTS_VALUE).
533 * @note The ASF header does NOT contain a correct start_time the ASF
534 * demuxer must NOT set this.
539 * Decoding: duration of the stream, in stream time base.
540 * If a source file does not specify a duration, but does specify
541 * a bitrate, this value will be estimated from bitrate and file size.
545 #if FF_API_OLD_METADATA
546 attribute_deprecated char language[4]; /**< ISO 639-2/B 3-letter language code (empty string if undefined) */
549 /* av_read_frame() support */
550 enum AVStreamParseType need_parsing;
551 struct AVCodecParserContext *parser;
554 int last_IP_duration;
556 /* av_seek_frame() support */
557 AVIndexEntry *index_entries; /**< Only used if the format does not
558 support seeking natively. */
559 int nb_index_entries;
560 unsigned int index_entries_allocated_size;
562 int64_t nb_frames; ///< number of frames in this stream if known or 0
564 #if FF_API_LAVF_UNUSED
565 attribute_deprecated int64_t unused[4+1];
568 #if FF_API_OLD_METADATA
569 attribute_deprecated char *filename; /**< source filename of the stream */
572 int disposition; /**< AV_DISPOSITION_* bit field */
574 AVProbeData probe_data;
575 #define MAX_REORDER_DELAY 16
576 int64_t pts_buffer[MAX_REORDER_DELAY+1];
579 * sample aspect ratio (0 if unknown)
580 * - encoding: Set by user.
581 * - decoding: Set by libavformat.
583 AVRational sample_aspect_ratio;
585 AVMetadata *metadata;
587 /* Intended mostly for av_read_frame() support. Not supposed to be used by */
588 /* external applications; try to use something else if at all possible. */
589 const uint8_t *cur_ptr;
593 // Timestamp generation support:
595 * Timestamp corresponding to the last dts sync point.
597 * Initialized when AVCodecParserContext.dts_sync_point >= 0 and
598 * a DTS is received from the underlying container. Otherwise set to
599 * AV_NOPTS_VALUE by default.
601 int64_t reference_dts;
604 * Number of packets to buffer for codec probing
605 * NOT PART OF PUBLIC API
607 #define MAX_PROBE_PACKETS 2500
611 * last packet in packet_buffer for this stream when muxing.
612 * used internally, NOT PART OF PUBLIC API, dont read or write from outside of libav*
614 struct AVPacketList *last_in_packet_buffer;
619 AVRational avg_frame_rate;
622 * Number of frames that have been demuxed during av_find_stream_info()
624 int codec_info_nb_frames;
627 * Stream informations used internally by av_find_stream_info()
629 #define MAX_STD_TIMEBASES (60*12+5)
632 int64_t duration_gcd;
634 double duration_error[MAX_STD_TIMEBASES];
635 int64_t codec_info_duration;
639 #define AV_PROGRAM_RUNNING 1
642 * New fields can be added to the end with minor version bumps.
643 * Removal, reordering and changes to existing fields require a major
645 * sizeof(AVProgram) must not be used outside libav*.
647 typedef struct AVProgram {
649 #if FF_API_OLD_METADATA
650 attribute_deprecated char *provider_name; ///< network name for DVB streams
651 attribute_deprecated char *name; ///< service name for DVB streams
654 enum AVDiscard discard; ///< selects which program to discard and which to feed to the caller
655 unsigned int *stream_index;
656 unsigned int nb_stream_indexes;
657 AVMetadata *metadata;
660 #define AVFMTCTX_NOHEADER 0x0001 /**< signal that no header is present
661 (streams are added dynamically) */
663 typedef struct AVChapter {
664 int id; ///< unique ID to identify the chapter
665 AVRational time_base; ///< time base in which the start/end timestamps are specified
666 int64_t start, end; ///< chapter start/end time in time_base units
667 #if FF_API_OLD_METADATA
668 attribute_deprecated char *title; ///< chapter title
670 AVMetadata *metadata;
673 #if FF_API_MAX_STREAMS
674 #define MAX_STREAMS 20
678 * Format I/O context.
679 * New fields can be added to the end with minor version bumps.
680 * Removal, reordering and changes to existing fields require a major
682 * sizeof(AVFormatContext) must not be used outside libav*.
684 typedef struct AVFormatContext {
685 const AVClass *av_class; /**< Set by avformat_alloc_context. */
686 /* Can only be iformat or oformat, not both at the same time. */
687 struct AVInputFormat *iformat;
688 struct AVOutputFormat *oformat;
691 unsigned int nb_streams;
692 #if FF_API_MAX_STREAMS
693 AVStream *streams[MAX_STREAMS];
697 char filename[1024]; /**< input or output filename */
700 #if FF_API_OLD_METADATA
701 attribute_deprecated char title[512];
702 attribute_deprecated char author[512];
703 attribute_deprecated char copyright[512];
704 attribute_deprecated char comment[512];
705 attribute_deprecated char album[512];
706 attribute_deprecated int year; /**< ID3 year, 0 if none */
707 attribute_deprecated int track; /**< track number, 0 if none */
708 attribute_deprecated char genre[32]; /**< ID3 genre */
711 int ctx_flags; /**< Format-specific flags, see AVFMTCTX_xx */
712 /* private data for pts handling (do not modify directly). */
714 * This buffer is only needed when packets were already buffered but
715 * not decoded, for example to get the codec parameters in MPEG
718 struct AVPacketList *packet_buffer;
721 * Decoding: position of the first frame of the component, in
722 * AV_TIME_BASE fractional seconds. NEVER set this value directly:
723 * It is deduced from the AVStream values.
728 * Decoding: duration of the stream, in AV_TIME_BASE fractional
729 * seconds. Only set this value if you know none of the individual stream
730 * durations and also dont set any of them. This is deduced from the
731 * AVStream values if not set.
736 * decoding: total file size, 0 if unknown
741 * Decoding: total stream bitrate in bit/s, 0 if not
742 * available. Never set it directly if the file_size and the
743 * duration are known as FFmpeg can compute it automatically.
747 /* av_read_frame() support */
749 #if FF_API_LAVF_UNUSED
750 const uint8_t *cur_ptr_deprecated;
751 int cur_len_deprecated;
752 AVPacket cur_pkt_deprecated;
755 /* av_seek_frame() support */
756 int64_t data_offset; /**< offset of the first packet */
760 unsigned int packet_size;
764 #define AVFMT_NOOUTPUTLOOP -1
765 #define AVFMT_INFINITEOUTPUTLOOP 0
767 * number of times to loop output in formats that support it
772 #define AVFMT_FLAG_GENPTS 0x0001 ///< Generate missing pts even if it requires parsing future frames.
773 #define AVFMT_FLAG_IGNIDX 0x0002 ///< Ignore index.
774 #define AVFMT_FLAG_NONBLOCK 0x0004 ///< Do not block when reading packets from input.
775 #define AVFMT_FLAG_IGNDTS 0x0008 ///< Ignore DTS on frames that contain both DTS & PTS
776 #define AVFMT_FLAG_NOFILLIN 0x0010 ///< Do not infer any values from other values, just return what is stored in the container
777 #define AVFMT_FLAG_NOPARSE 0x0020 ///< Do not use AVParsers, you also must set AVFMT_FLAG_NOFILLIN as the fillin code works on frames and no parsing -> no frames. Also seeking to frames can not work if parsing to find frame boundaries has been disabled
778 #define AVFMT_FLAG_RTP_HINT 0x0040 ///< Add RTP hinting to the output file
783 * decoding: size of data to probe; encoding: unused.
785 unsigned int probesize;
788 * Maximum time (in AV_TIME_BASE units) during which the input should
789 * be analyzed in av_find_stream_info().
791 int max_analyze_duration;
796 unsigned int nb_programs;
797 AVProgram **programs;
800 * Forced video codec_id.
801 * Demuxing: Set by user.
803 enum CodecID video_codec_id;
806 * Forced audio codec_id.
807 * Demuxing: Set by user.
809 enum CodecID audio_codec_id;
812 * Forced subtitle codec_id.
813 * Demuxing: Set by user.
815 enum CodecID subtitle_codec_id;
818 * Maximum amount of memory in bytes to use for the index of each stream.
819 * If the index exceeds this size, entries will be discarded as
820 * needed to maintain a smaller size. This can lead to slower or less
821 * accurate seeking (depends on demuxer).
822 * Demuxers for which a full in-memory index is mandatory will ignore
825 * demuxing: set by user
827 unsigned int max_index_size;
830 * Maximum amount of memory in bytes to use for buffering frames
831 * obtained from realtime capture devices.
833 unsigned int max_picture_buffer;
835 unsigned int nb_chapters;
836 AVChapter **chapters;
839 * Flags to enable debugging.
842 #define FF_FDEBUG_TS 0x0001
845 * Raw packets from the demuxer, prior to parsing and decoding.
846 * This buffer is used for buffering packets until the codec can
847 * be identified, as parsing cannot be done without knowing the
850 struct AVPacketList *raw_packet_buffer;
851 struct AVPacketList *raw_packet_buffer_end;
853 struct AVPacketList *packet_buffer_end;
855 AVMetadata *metadata;
858 * Remaining size available for raw_packet_buffer, in bytes.
859 * NOT PART OF PUBLIC API
861 #define RAW_PACKET_BUFFER_SIZE 2500000
862 int raw_packet_buffer_remaining_size;
865 * Start time of the stream in real world time, in microseconds
866 * since the unix epoch (00:00 1st January 1970). That is, pts=0
867 * in the stream was captured at this real world time.
868 * - encoding: Set by user.
869 * - decoding: Unused.
871 int64_t start_time_realtime;
874 typedef struct AVPacketList {
876 struct AVPacketList *next;
879 #if FF_API_FIRST_FORMAT
880 attribute_deprecated extern AVInputFormat *first_iformat;
881 attribute_deprecated extern AVOutputFormat *first_oformat;
885 * If f is NULL, returns the first registered input format,
886 * if f is non-NULL, returns the next registered input format after f
887 * or NULL if f is the last one.
889 AVInputFormat *av_iformat_next(AVInputFormat *f);
892 * If f is NULL, returns the first registered output format,
893 * if f is non-NULL, returns the next registered output format after f
894 * or NULL if f is the last one.
896 AVOutputFormat *av_oformat_next(AVOutputFormat *f);
898 enum CodecID av_guess_image2_codec(const char *filename);
900 /* XXX: Use automatic init with either ELF sections or C file parser */
904 void av_register_input_format(AVInputFormat *format);
905 void av_register_output_format(AVOutputFormat *format);
906 #if FF_API_GUESS_FORMAT
907 attribute_deprecated AVOutputFormat *guess_stream_format(const char *short_name,
908 const char *filename,
909 const char *mime_type);
912 * @deprecated Use av_guess_format() instead.
914 attribute_deprecated AVOutputFormat *guess_format(const char *short_name,
915 const char *filename,
916 const char *mime_type);
920 * Return the output format in the list of registered output formats
921 * which best matches the provided parameters, or return NULL if
924 * @param short_name if non-NULL checks if short_name matches with the
925 * names of the registered formats
926 * @param filename if non-NULL checks if filename terminates with the
927 * extensions of the registered formats
928 * @param mime_type if non-NULL checks if mime_type matches with the
929 * MIME type of the registered formats
931 AVOutputFormat *av_guess_format(const char *short_name,
932 const char *filename,
933 const char *mime_type);
936 * Guess the codec ID based upon muxer and filename.
938 enum CodecID av_guess_codec(AVOutputFormat *fmt, const char *short_name,
939 const char *filename, const char *mime_type,
940 enum AVMediaType type);
943 * Send a nice hexadecimal dump of a buffer to the specified file stream.
945 * @param f The file stream pointer where the dump should be sent to.
947 * @param size buffer size
949 * @see av_hex_dump_log, av_pkt_dump, av_pkt_dump_log
951 void av_hex_dump(FILE *f, uint8_t *buf, int size);
954 * Send a nice hexadecimal dump of a buffer to the log.
956 * @param avcl A pointer to an arbitrary struct of which the first field is a
957 * pointer to an AVClass struct.
958 * @param level The importance level of the message, lower values signifying
961 * @param size buffer size
963 * @see av_hex_dump, av_pkt_dump, av_pkt_dump_log
965 void av_hex_dump_log(void *avcl, int level, uint8_t *buf, int size);
968 * Send a nice dump of a packet to the specified file stream.
970 * @param f The file stream pointer where the dump should be sent to.
971 * @param pkt packet to dump
972 * @param dump_payload True if the payload must be displayed, too.
974 void av_pkt_dump(FILE *f, AVPacket *pkt, int dump_payload);
977 * Send a nice dump of a packet to the log.
979 * @param avcl A pointer to an arbitrary struct of which the first field is a
980 * pointer to an AVClass struct.
981 * @param level The importance level of the message, lower values signifying
983 * @param pkt packet to dump
984 * @param dump_payload True if the payload must be displayed, too.
986 void av_pkt_dump_log(void *avcl, int level, AVPacket *pkt, int dump_payload);
989 * Initialize libavformat and register all the muxers, demuxers and
990 * protocols. If you do not call this function, then you can select
991 * exactly which formats you want to support.
993 * @see av_register_input_format()
994 * @see av_register_output_format()
995 * @see av_register_protocol()
997 void av_register_all(void);
1000 * Get the CodecID for the given codec tag tag.
1001 * If no codec id is found returns CODEC_ID_NONE.
1003 * @param tags list of supported codec_id-codec_tag pairs, as stored
1004 * in AVInputFormat.codec_tag and AVOutputFormat.codec_tag
1006 enum CodecID av_codec_get_id(const struct AVCodecTag * const *tags, unsigned int tag);
1009 * Get the codec tag for the given codec id id.
1010 * If no codec tag is found returns 0.
1012 * @param tags list of supported codec_id-codec_tag pairs, as stored
1013 * in AVInputFormat.codec_tag and AVOutputFormat.codec_tag
1015 unsigned int av_codec_get_tag(const struct AVCodecTag * const *tags, enum CodecID id);
1017 /* media file input */
1020 * Find AVInputFormat based on the short name of the input format.
1022 AVInputFormat *av_find_input_format(const char *short_name);
1025 * Guess the file format.
1027 * @param is_opened Whether the file is already opened; determines whether
1028 * demuxers with or without AVFMT_NOFILE are probed.
1030 AVInputFormat *av_probe_input_format(AVProbeData *pd, int is_opened);
1033 * Guess the file format.
1035 * @param is_opened Whether the file is already opened; determines whether
1036 * demuxers with or without AVFMT_NOFILE are probed.
1037 * @param score_max A probe score larger that this is required to accept a
1038 * detection, the variable is set to the actual detection
1040 * If the score is <= AVPROBE_SCORE_MAX / 4 it is recommended
1041 * to retry with a larger probe buffer.
1043 AVInputFormat *av_probe_input_format2(AVProbeData *pd, int is_opened, int *score_max);
1046 * Probe a bytestream to determine the input format. Each time a probe returns
1047 * with a score that is too low, the probe buffer size is increased and another
1048 * attempt is made. When the maximum probe size is reached, the input format
1049 * with the highest score is returned.
1051 * @param pb the bytestream to probe
1052 * @param fmt the input format is put here
1053 * @param filename the filename of the stream
1054 * @param logctx the log context
1055 * @param offset the offset within the bytestream to probe from
1056 * @param max_probe_size the maximum probe buffer size (zero for default)
1057 * @return 0 in case of success, a negative value corresponding to an
1058 * AVERROR code otherwise
1060 int av_probe_input_buffer(ByteIOContext *pb, AVInputFormat **fmt,
1061 const char *filename, void *logctx,
1062 unsigned int offset, unsigned int max_probe_size);
1065 * Allocate all the structures needed to read an input stream.
1066 * This does not open the needed codecs for decoding the stream[s].
1068 int av_open_input_stream(AVFormatContext **ic_ptr,
1069 ByteIOContext *pb, const char *filename,
1070 AVInputFormat *fmt, AVFormatParameters *ap);
1073 * Open a media file as input. The codecs are not opened. Only the file
1074 * header (if present) is read.
1076 * @param ic_ptr The opened media file handle is put here.
1077 * @param filename filename to open
1078 * @param fmt If non-NULL, force the file format to use.
1079 * @param buf_size optional buffer size (zero if default is OK)
1080 * @param ap Additional parameters needed when opening the file
1081 * (NULL if default).
1082 * @return 0 if OK, AVERROR_xxx otherwise
1084 int av_open_input_file(AVFormatContext **ic_ptr, const char *filename,
1087 AVFormatParameters *ap);
1089 #if FF_API_ALLOC_FORMAT_CONTEXT
1091 * @deprecated Use avformat_alloc_context() instead.
1093 attribute_deprecated AVFormatContext *av_alloc_format_context(void);
1097 * Allocate an AVFormatContext.
1098 * avformat_free_context() can be used to free the context and everything
1099 * allocated by the framework within it.
1101 AVFormatContext *avformat_alloc_context(void);
1104 * Read packets of a media file to get stream information. This
1105 * is useful for file formats with no headers such as MPEG. This
1106 * function also computes the real framerate in case of MPEG-2 repeat
1108 * The logical file position is not changed by this function;
1109 * examined packets may be buffered for later processing.
1111 * @param ic media file handle
1112 * @return >=0 if OK, AVERROR_xxx on error
1113 * @todo Let the user decide somehow what information is needed so that
1114 * we do not waste time getting stuff the user does not need.
1116 int av_find_stream_info(AVFormatContext *ic);
1119 * Find the "best" stream in the file.
1120 * The best stream is determined according to various heuristics as the most
1121 * likely to be what the user expects.
1122 * If the decoder parameter is non-NULL, av_find_best_stream will find the
1123 * default decoder for the stream's codec; streams for which no decoder can
1124 * be found are ignored.
1126 * @param ic media file handle
1127 * @param type stream type: video, audio, subtitles, etc.
1128 * @param wanted_stream_nb user-requested stream number,
1129 * or -1 for automatic selection
1130 * @param related_stream try to find a stream related (eg. in the same
1131 * program) to this one, or -1 if none
1132 * @param decoder_ret if non-NULL, returns the decoder for the
1134 * @param flags flags; none are currently defined
1135 * @return the non-negative stream number in case of success,
1136 * AVERROR_STREAM_NOT_FOUND if no stream with the requested type
1138 * AVERROR_DECODER_NOT_FOUND if streams were found but no decoder
1139 * @note If av_find_best_stream returns successfully and decoder_ret is not
1140 * NULL, then *decoder_ret is guaranteed to be set to a valid AVCodec.
1142 int av_find_best_stream(AVFormatContext *ic,
1143 enum AVMediaType type,
1144 int wanted_stream_nb,
1146 AVCodec **decoder_ret,
1150 * Read a transport packet from a media file.
1152 * This function is obsolete and should never be used.
1153 * Use av_read_frame() instead.
1155 * @param s media file handle
1156 * @param pkt is filled
1157 * @return 0 if OK, AVERROR_xxx on error
1159 int av_read_packet(AVFormatContext *s, AVPacket *pkt);
1162 * Return the next frame of a stream.
1163 * This function returns what is stored in the file, and does not validate
1164 * that what is there are valid frames for the decoder. It will split what is
1165 * stored in the file into frames and return one for each call. It will not
1166 * omit invalid data between valid frames so as to give the decoder the maximum
1167 * information possible for decoding.
1169 * The returned packet is valid
1170 * until the next av_read_frame() or until av_close_input_file() and
1171 * must be freed with av_free_packet. For video, the packet contains
1172 * exactly one frame. For audio, it contains an integer number of
1173 * frames if each frame has a known fixed size (e.g. PCM or ADPCM
1174 * data). If the audio frames have a variable size (e.g. MPEG audio),
1175 * then it contains one frame.
1177 * pkt->pts, pkt->dts and pkt->duration are always set to correct
1178 * values in AVStream.time_base units (and guessed if the format cannot
1179 * provide them). pkt->pts can be AV_NOPTS_VALUE if the video format
1180 * has B-frames, so it is better to rely on pkt->dts if you do not
1181 * decompress the payload.
1183 * @return 0 if OK, < 0 on error or end of file
1185 int av_read_frame(AVFormatContext *s, AVPacket *pkt);
1188 * Seek to the keyframe at timestamp.
1189 * 'timestamp' in 'stream_index'.
1190 * @param stream_index If stream_index is (-1), a default
1191 * stream is selected, and timestamp is automatically converted
1192 * from AV_TIME_BASE units to the stream specific time_base.
1193 * @param timestamp Timestamp in AVStream.time_base units
1194 * or, if no stream is specified, in AV_TIME_BASE units.
1195 * @param flags flags which select direction and seeking mode
1196 * @return >= 0 on success
1198 int av_seek_frame(AVFormatContext *s, int stream_index, int64_t timestamp,
1202 * Seek to timestamp ts.
1203 * Seeking will be done so that the point from which all active streams
1204 * can be presented successfully will be closest to ts and within min/max_ts.
1205 * Active streams are all streams that have AVStream.discard < AVDISCARD_ALL.
1207 * If flags contain AVSEEK_FLAG_BYTE, then all timestamps are in bytes and
1208 * are the file position (this may not be supported by all demuxers).
1209 * If flags contain AVSEEK_FLAG_FRAME, then all timestamps are in frames
1210 * in the stream with stream_index (this may not be supported by all demuxers).
1211 * Otherwise all timestamps are in units of the stream selected by stream_index
1212 * or if stream_index is -1, in AV_TIME_BASE units.
1213 * If flags contain AVSEEK_FLAG_ANY, then non-keyframes are treated as
1214 * keyframes (this may not be supported by all demuxers).
1216 * @param stream_index index of the stream which is used as time base reference
1217 * @param min_ts smallest acceptable timestamp
1218 * @param ts target timestamp
1219 * @param max_ts largest acceptable timestamp
1220 * @param flags flags
1221 * @return >=0 on success, error code otherwise
1223 * @note This is part of the new seek API which is still under construction.
1224 * Thus do not use this yet. It may change at any time, do not expect
1225 * ABI compatibility yet!
1227 int avformat_seek_file(AVFormatContext *s, int stream_index, int64_t min_ts, int64_t ts, int64_t max_ts, int flags);
1230 * Start playing a network-based stream (e.g. RTSP stream) at the
1233 int av_read_play(AVFormatContext *s);
1236 * Pause a network-based stream (e.g. RTSP stream).
1238 * Use av_read_play() to resume it.
1240 int av_read_pause(AVFormatContext *s);
1243 * Free a AVFormatContext allocated by av_open_input_stream.
1244 * @param s context to free
1246 void av_close_input_stream(AVFormatContext *s);
1249 * Close a media file (but not its codecs).
1251 * @param s media file handle
1253 void av_close_input_file(AVFormatContext *s);
1256 * Free an AVFormatContext and all its streams.
1257 * @param s context to free
1259 void avformat_free_context(AVFormatContext *s);
1262 * Add a new stream to a media file.
1264 * Can only be called in the read_header() function. If the flag
1265 * AVFMTCTX_NOHEADER is in the format context, then new streams
1266 * can be added in read_packet too.
1268 * @param s media file handle
1269 * @param id file-format-dependent stream ID
1271 AVStream *av_new_stream(AVFormatContext *s, int id);
1272 AVProgram *av_new_program(AVFormatContext *s, int id);
1275 * Set the pts for a given stream. If the new values would be invalid
1276 * (<= 0), it leaves the AVStream unchanged.
1279 * @param pts_wrap_bits number of bits effectively used by the pts
1280 * (used for wrap control, 33 is the value for MPEG)
1281 * @param pts_num numerator to convert to seconds (MPEG: 1)
1282 * @param pts_den denominator to convert to seconds (MPEG: 90000)
1284 void av_set_pts_info(AVStream *s, int pts_wrap_bits,
1285 unsigned int pts_num, unsigned int pts_den);
1287 #define AVSEEK_FLAG_BACKWARD 1 ///< seek backward
1288 #define AVSEEK_FLAG_BYTE 2 ///< seeking based on position in bytes
1289 #define AVSEEK_FLAG_ANY 4 ///< seek to any frame, even non-keyframes
1290 #define AVSEEK_FLAG_FRAME 8 ///< seeking based on frame number
1292 int av_find_default_stream_index(AVFormatContext *s);
1295 * Get the index for a specific timestamp.
1296 * @param flags if AVSEEK_FLAG_BACKWARD then the returned index will correspond
1297 * to the timestamp which is <= the requested one, if backward
1298 * is 0, then it will be >=
1299 * if AVSEEK_FLAG_ANY seek to any frame, only keyframes otherwise
1300 * @return < 0 if no such timestamp could be found
1302 int av_index_search_timestamp(AVStream *st, int64_t timestamp, int flags);
1305 * Add an index entry into a sorted list. Update the entry if the list
1306 * already contains it.
1308 * @param timestamp timestamp in the time base of the given stream
1310 int av_add_index_entry(AVStream *st, int64_t pos, int64_t timestamp,
1311 int size, int distance, int flags);
1314 * Perform a binary search using av_index_search_timestamp() and
1315 * AVInputFormat.read_timestamp().
1316 * This is not supposed to be called directly by a user application,
1318 * @param target_ts target timestamp in the time base of the given stream
1319 * @param stream_index stream number
1321 int av_seek_frame_binary(AVFormatContext *s, int stream_index,
1322 int64_t target_ts, int flags);
1325 * Update cur_dts of all streams based on the given timestamp and AVStream.
1327 * Stream ref_st unchanged, others set cur_dts in their native time base.
1328 * Only needed for timestamp wrapping or if (dts not set and pts!=dts).
1329 * @param timestamp new dts expressed in time_base of param ref_st
1330 * @param ref_st reference stream giving time_base of param timestamp
1332 void av_update_cur_dts(AVFormatContext *s, AVStream *ref_st, int64_t timestamp);
1335 * Perform a binary search using read_timestamp().
1336 * This is not supposed to be called directly by a user application,
1338 * @param target_ts target timestamp in the time base of the given stream
1339 * @param stream_index stream number
1341 int64_t av_gen_search(AVFormatContext *s, int stream_index,
1342 int64_t target_ts, int64_t pos_min,
1343 int64_t pos_max, int64_t pos_limit,
1344 int64_t ts_min, int64_t ts_max,
1345 int flags, int64_t *ts_ret,
1346 int64_t (*read_timestamp)(struct AVFormatContext *, int , int64_t *, int64_t ));
1351 int av_set_parameters(AVFormatContext *s, AVFormatParameters *ap);
1354 * Split a URL string into components.
1356 * The pointers to buffers for storing individual components may be null,
1357 * in order to ignore that component. Buffers for components not found are
1358 * set to empty strings. If the port is not found, it is set to a negative
1361 * @param proto the buffer for the protocol
1362 * @param proto_size the size of the proto buffer
1363 * @param authorization the buffer for the authorization
1364 * @param authorization_size the size of the authorization buffer
1365 * @param hostname the buffer for the host name
1366 * @param hostname_size the size of the hostname buffer
1367 * @param port_ptr a pointer to store the port number in
1368 * @param path the buffer for the path
1369 * @param path_size the size of the path buffer
1370 * @param url the URL to split
1372 void av_url_split(char *proto, int proto_size,
1373 char *authorization, int authorization_size,
1374 char *hostname, int hostname_size,
1376 char *path, int path_size,
1380 * Allocate the stream private data and write the stream header to an
1381 * output media file.
1382 * Note: this sets stream time-bases, if possible to stream->codec->time_base
1383 * but for some formats it might also be some other time base
1385 * @param s media file handle
1386 * @return 0 if OK, AVERROR_xxx on error
1388 int av_write_header(AVFormatContext *s);
1391 * Write a packet to an output media file.
1393 * The packet shall contain one audio or video frame.
1394 * The packet must be correctly interleaved according to the container
1395 * specification, if not then av_interleaved_write_frame must be used.
1397 * @param s media file handle
1398 * @param pkt The packet, which contains the stream_index, buf/buf_size,
1400 * @return < 0 on error, = 0 if OK, 1 if end of stream wanted
1402 int av_write_frame(AVFormatContext *s, AVPacket *pkt);
1405 * Write a packet to an output media file ensuring correct interleaving.
1407 * The packet must contain one audio or video frame.
1408 * If the packets are already correctly interleaved, the application should
1409 * call av_write_frame() instead as it is slightly faster. It is also important
1410 * to keep in mind that completely non-interleaved input will need huge amounts
1411 * of memory to interleave with this, so it is preferable to interleave at the
1414 * @param s media file handle
1415 * @param pkt The packet, which contains the stream_index, buf/buf_size,
1417 * @return < 0 on error, = 0 if OK, 1 if end of stream wanted
1419 int av_interleaved_write_frame(AVFormatContext *s, AVPacket *pkt);
1422 * Interleave a packet per dts in an output media file.
1424 * Packets with pkt->destruct == av_destruct_packet will be freed inside this
1425 * function, so they cannot be used after it. Note that calling av_free_packet()
1426 * on them is still safe.
1428 * @param s media file handle
1429 * @param out the interleaved packet will be output here
1430 * @param pkt the input packet
1431 * @param flush 1 if no further packets are available as input and all
1432 * remaining packets should be output
1433 * @return 1 if a packet was output, 0 if no packet could be output,
1434 * < 0 if an error occurred
1436 int av_interleave_packet_per_dts(AVFormatContext *s, AVPacket *out,
1437 AVPacket *pkt, int flush);
1440 * Write the stream trailer to an output media file and free the
1441 * file private data.
1443 * May only be called after a successful call to av_write_header.
1445 * @param s media file handle
1446 * @return 0 if OK, AVERROR_xxx on error
1448 int av_write_trailer(AVFormatContext *s);
1450 void dump_format(AVFormatContext *ic,
1455 #if FF_API_PARSE_FRAME_PARAM
1457 * Parse width and height out of string str.
1458 * @deprecated Use av_parse_video_frame_size instead.
1460 attribute_deprecated int parse_image_size(int *width_ptr, int *height_ptr,
1464 * Convert framerate from a string to a fraction.
1465 * @deprecated Use av_parse_video_frame_rate instead.
1467 attribute_deprecated int parse_frame_rate(int *frame_rate, int *frame_rate_base,
1472 * Parse datestr and return a corresponding number of microseconds.
1473 * @param datestr String representing a date or a duration.
1474 * - If a date the syntax is:
1476 * now|{[{YYYY-MM-DD|YYYYMMDD}[T|t| ]]{{HH[:MM[:SS[.m...]]]}|{HH[MM[SS[.m...]]]}}[Z|z]}
1478 * If the value is "now" it takes the current time.
1479 * Time is local time unless Z is appended, in which case it is
1480 * interpreted as UTC.
1481 * If the year-month-day part is not specified it takes the current
1483 * @return the number of microseconds since 1st of January, 1970 up to
1484 * the time of the parsed date or INT64_MIN if datestr cannot be
1485 * successfully parsed.
1486 * - If a duration the syntax is:
1488 * [-]HH[:MM[:SS[.m...]]]
1491 * @return the number of microseconds contained in a time interval
1492 * with the specified duration or INT64_MIN if datestr cannot be
1493 * successfully parsed.
1494 * @param duration Flag which tells how to interpret datestr, if
1495 * not zero datestr is interpreted as a duration, otherwise as a
1498 int64_t parse_date(const char *datestr, int duration);
1501 * Get the current time in microseconds.
1503 int64_t av_gettime(void);
1505 /* ffm-specific for ffserver */
1506 #define FFM_PACKET_SIZE 4096
1507 int64_t ffm_read_write_index(int fd);
1508 int ffm_write_write_index(int fd, int64_t pos);
1509 void ffm_set_write_index(AVFormatContext *s, int64_t pos, int64_t file_size);
1512 * Attempt to find a specific tag in a URL.
1514 * syntax: '?tag1=val1&tag2=val2...'. Little URL decoding is done.
1515 * Return 1 if found.
1517 int find_info_tag(char *arg, int arg_size, const char *tag1, const char *info);
1520 * Return in 'buf' the path with '%d' replaced by a number.
1522 * Also handles the '%0nd' format where 'n' is the total number
1523 * of digits and '%%'.
1525 * @param buf destination buffer
1526 * @param buf_size destination buffer size
1527 * @param path numbered sequence string
1528 * @param number frame number
1529 * @return 0 if OK, -1 on format error
1531 int av_get_frame_filename(char *buf, int buf_size,
1532 const char *path, int number);
1535 * Check whether filename actually is a numbered sequence generator.
1537 * @param filename possible numbered sequence string
1538 * @return 1 if a valid numbered sequence string, 0 otherwise
1540 int av_filename_number_test(const char *filename);
1543 * Generate an SDP for an RTP session.
1545 * @param ac array of AVFormatContexts describing the RTP streams. If the
1546 * array is composed by only one context, such context can contain
1547 * multiple AVStreams (one AVStream per RTP stream). Otherwise,
1548 * all the contexts in the array (an AVCodecContext per RTP stream)
1549 * must contain only one AVStream.
1550 * @param n_files number of AVCodecContexts contained in ac
1551 * @param buff buffer where the SDP will be stored (must be allocated by
1553 * @param size the size of the buffer
1554 * @return 0 if OK, AVERROR_xxx on error
1556 int avf_sdp_create(AVFormatContext *ac[], int n_files, char *buff, int size);
1559 * Return a positive value if the given filename has one of the given
1560 * extensions, 0 otherwise.
1562 * @param extensions a comma-separated list of filename extensions
1564 int av_match_ext(const char *filename, const char *extensions);
1566 #endif /* AVFORMAT_AVFORMAT_H */