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 * Return the LIBAVFORMAT_VERSION_INT constant.
28 unsigned avformat_version(void);
31 * Return the libavformat build-time configuration.
33 const char *avformat_configuration(void);
36 * Return the libavformat license.
38 const char *avformat_license(void);
41 #include <stdio.h> /* FILE */
42 #include "libavcodec/avcodec.h"
45 #include "libavformat/version.h"
47 struct AVFormatContext;
51 * Public Metadata API.
52 * The metadata API allows libavformat to export metadata tags to a client
53 * application using a sequence of key/value pairs. Like all strings in FFmpeg,
54 * metadata must be stored as UTF-8 encoded Unicode. Note that metadata
55 * exported by demuxers isn't checked to be valid UTF-8 in most cases.
56 * Important concepts to keep in mind:
57 * 1. Keys are unique; there can never be 2 tags with the same key. This is
58 * also meant semantically, i.e., a demuxer should not knowingly produce
59 * several keys that are literally different but semantically identical.
60 * E.g., key=Author5, key=Author6. In this example, all authors must be
61 * placed in the same tag.
62 * 2. Metadata is flat, not hierarchical; there are no subtags. If you
63 * want to store, e.g., the email address of the child of producer Alice
64 * and actor Bob, that could have key=alice_and_bobs_childs_email_address.
65 * 3. Several modifiers can be applied to the tag name. This is done by
66 * appending a dash character ('-') and the modifier name in the order
67 * they appear in the list below -- e.g. foo-eng-sort, not foo-sort-eng.
68 * a) language -- a tag whose value is localized for a particular language
69 * is appended with the ISO 639-2/B 3-letter language code.
70 * For example: Author-ger=Michael, Author-eng=Mike
71 * The original/default language is in the unqualified "Author" tag.
72 * A demuxer should set a default if it sets any translated tag.
73 * b) sorting -- a modified version of a tag that should be used for
74 * sorting will have '-sort' appended. E.g. artist="The Beatles",
75 * artist-sort="Beatles, The".
77 * 4. Demuxers attempt to export metadata in a generic format, however tags
78 * with no generic equivalents are left as they are stored in the container.
79 * Follows a list of generic tag names:
81 * album -- name of the set this work belongs to
82 * album_artist -- main creator of the set/album, if different from artist.
83 * e.g. "Various Artists" for compilation albums.
84 * artist -- main creator of the work
85 * comment -- any additional description of the file.
86 * composer -- who composed the work, if different from artist.
87 * copyright -- name of copyright holder.
88 * creation_time-- date when the file was created, preferably in ISO 8601.
89 * date -- date when the work was created, preferably in ISO 8601.
90 * disc -- number of a subset, e.g. disc in a multi-disc collection.
91 * encoder -- name/settings of the software/hardware that produced the file.
92 * encoded_by -- person/group who created the file.
93 * filename -- original name of the file.
94 * genre -- <self-evident>.
95 * language -- main language in which the work is performed, preferably
96 * in ISO 639-2 format. Multiple languages can be specified by
97 * separating them with commas.
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.
106 * variant_bitrate -- the total bitrate of the bitrate variant that the current stream is part of
109 #define AV_METADATA_MATCH_CASE 1
110 #define AV_METADATA_IGNORE_SUFFIX 2
111 #define AV_METADATA_DONT_STRDUP_KEY 4
112 #define AV_METADATA_DONT_STRDUP_VAL 8
113 #define AV_METADATA_DONT_OVERWRITE 16 ///< Don't overwrite existing tags.
120 typedef struct AVMetadata AVMetadata;
121 #if FF_API_OLD_METADATA2
122 typedef struct AVMetadataConv AVMetadataConv;
126 * Get a metadata element with matching key.
128 * @param prev Set to the previous matching element to find the next.
129 * If set to NULL the first matching element is returned.
130 * @param flags Allows case as well as suffix-insensitive comparisons.
131 * @return Found tag or NULL, changing key or value leads to undefined behavior.
134 av_metadata_get(AVMetadata *m, const char *key, const AVMetadataTag *prev, int flags);
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 depending on flags)
142 * @param value tag value to add to *pm (will be av_strduped depending on flags).
143 * Passing a NULL value will cause an existing tag to be deleted.
144 * @return >= 0 on success otherwise an error code <0
146 int av_metadata_set2(AVMetadata **pm, const char *key, const char *value, int flags);
148 #if FF_API_OLD_METADATA2
150 * This function is provided for compatibility reason and currently does nothing.
152 attribute_deprecated void av_metadata_conv(struct AVFormatContext *ctx, const AVMetadataConv *d_conv,
153 const AVMetadataConv *s_conv);
157 * Copy metadata from one AVMetadata struct into another.
158 * @param dst pointer to a pointer to a AVMetadata struct. If *dst is NULL,
159 * this function will allocate a struct for you and put it in *dst
160 * @param src pointer to source AVMetadata struct
161 * @param flags flags to use when setting metadata in *dst
162 * @note metadata is read using the AV_METADATA_IGNORE_SUFFIX flag
164 void av_metadata_copy(AVMetadata **dst, AVMetadata *src, int flags);
167 * Free all the memory allocated for an AVMetadata struct.
169 void av_metadata_free(AVMetadata **m);
172 /* packet functions */
176 * Allocate and read the payload of a packet and initialize its
177 * fields with default values.
180 * @param size desired payload size
181 * @return >0 (read size) if OK, AVERROR_xxx otherwise
183 int av_get_packet(AVIOContext *s, AVPacket *pkt, int size);
187 * Read data and append it to the current content of the AVPacket.
188 * If pkt->size is 0 this is identical to av_get_packet.
189 * Note that this uses av_grow_packet and thus involves a realloc
190 * which is inefficient. Thus this function should only be used
191 * when there is no reasonable way to know (an upper bound of)
195 * @param size amount of data to read
196 * @return >0 (read size) if OK, AVERROR_xxx otherwise, previous data
197 * will not be lost even if an error occurs.
199 int av_append_packet(AVIOContext *s, AVPacket *pkt, int size);
201 /*************************************************/
202 /* fractional numbers for exact pts handling */
205 * The exact value of the fractional number is: 'val + num / den'.
206 * num is assumed to be 0 <= num < den.
208 typedef struct AVFrac {
209 int64_t val, num, den;
212 /*************************************************/
213 /* input/output formats */
218 * This structure contains the data a format has to probe a file.
220 typedef struct AVProbeData {
221 const char *filename;
222 unsigned char *buf; /**< Buffer must have AVPROBE_PADDING_SIZE of extra allocated bytes filled with zero. */
223 int buf_size; /**< Size of buf except extra allocated bytes */
226 #define AVPROBE_SCORE_MAX 100 ///< maximum score, half of that is used for file-extension-based detection
227 #define AVPROBE_PADDING_SIZE 32 ///< extra allocated bytes at the end of the probe buffer
229 typedef struct AVFormatParameters {
230 AVRational time_base;
231 #if FF_API_FORMAT_PARAMETERS
232 attribute_deprecated int sample_rate;
233 attribute_deprecated int channels;
234 attribute_deprecated int width;
235 attribute_deprecated int height;
237 enum PixelFormat pix_fmt;
238 #if FF_API_FORMAT_PARAMETERS
239 attribute_deprecated int channel; /**< Used to select DV channel. */
240 attribute_deprecated const char *standard; /**< deprecated, use demuxer-specific options instead. */
241 attribute_deprecated unsigned int mpeg2ts_raw:1; /**< deprecated, use mpegtsraw demuxer */
242 /**< deprecated, use mpegtsraw demuxer-specific options instead */
243 attribute_deprecated unsigned int mpeg2ts_compute_pcr:1;
244 attribute_deprecated unsigned int initial_pause:1; /**< Do not begin to play the stream
245 immediately (RTSP only). */
247 unsigned int prealloced_context:1;
248 } AVFormatParameters;
250 //! Demuxer will use avio_open, no opened file should be provided by the caller.
251 #define AVFMT_NOFILE 0x0001
252 #define AVFMT_NEEDNUMBER 0x0002 /**< Needs '%d' in filename. */
253 #define AVFMT_SHOW_IDS 0x0008 /**< Show format stream IDs numbers. */
254 #define AVFMT_RAWPICTURE 0x0020 /**< Format wants AVPicture structure for
256 #define AVFMT_GLOBALHEADER 0x0040 /**< Format wants global header. */
257 #define AVFMT_NOTIMESTAMPS 0x0080 /**< Format does not need / have any timestamps. */
258 #define AVFMT_GENERIC_INDEX 0x0100 /**< Use generic index building code. */
259 #define AVFMT_TS_DISCONT 0x0200 /**< Format allows timestamp discontinuities. Note, muxers always require valid (monotone) timestamps */
260 #define AVFMT_VARIABLE_FPS 0x0400 /**< Format allows variable fps. */
261 #define AVFMT_NODIMENSIONS 0x0800 /**< Format does not need width/height */
262 #define AVFMT_NOSTREAMS 0x1000 /**< Format does not require any streams */
263 #define AVFMT_NOBINSEARCH 0x2000 /**< Format does not allow to fallback to binary search via read_timestamp */
264 #define AVFMT_NOGENSEARCH 0x4000 /**< Format does not allow to fallback to generic search */
265 #define AVFMT_TS_NONSTRICT 0x8000 /**< Format does not require strictly
266 increasing timestamps, but they must
267 still be monotonic */
269 typedef struct AVOutputFormat {
272 * Descriptive name for the format, meant to be more human-readable
273 * than name. You should use the NULL_IF_CONFIG_SMALL() macro
276 const char *long_name;
277 const char *mime_type;
278 const char *extensions; /**< comma-separated filename extensions */
280 * size of private data so that it can be allocated in the wrapper
284 enum CodecID audio_codec; /**< default audio codec */
285 enum CodecID video_codec; /**< default video codec */
286 int (*write_header)(struct AVFormatContext *);
287 int (*write_packet)(struct AVFormatContext *, AVPacket *pkt);
288 int (*write_trailer)(struct AVFormatContext *);
290 * can use flags: AVFMT_NOFILE, AVFMT_NEEDNUMBER, AVFMT_RAWPICTURE,
291 * AVFMT_GLOBALHEADER, AVFMT_NOTIMESTAMPS, AVFMT_VARIABLE_FPS,
292 * AVFMT_NODIMENSIONS, AVFMT_NOSTREAMS
298 int (*interleave_packet)(struct AVFormatContext *, AVPacket *out,
299 AVPacket *in, int flush);
302 * List of supported codec_id-codec_tag pairs, ordered by "better
303 * choice first". The arrays are all terminated by CODEC_ID_NONE.
305 const struct AVCodecTag * const *codec_tag;
307 enum CodecID subtitle_codec; /**< default subtitle codec */
309 #if FF_API_OLD_METADATA2
310 const AVMetadataConv *metadata_conv;
313 const AVClass *priv_class; ///< AVClass for the private context
316 struct AVOutputFormat *next;
319 typedef struct AVInputFormat {
321 * A comma separated list of short names for the format. New names
322 * may be appended with a minor bump.
327 * Descriptive name for the format, meant to be more human-readable
328 * than name. You should use the NULL_IF_CONFIG_SMALL() macro
331 const char *long_name;
334 * Size of private data so that it can be allocated in the wrapper.
339 * Tell if a given file has a chance of being parsed as this format.
340 * The buffer provided is guaranteed to be AVPROBE_PADDING_SIZE bytes
341 * big so you do not have to check for that unless you need more.
343 int (*read_probe)(AVProbeData *);
346 * Read the format header and initialize the AVFormatContext
347 * structure. Return 0 if OK. 'ap' if non-NULL contains
348 * additional parameters. Only used in raw format right
349 * now. 'av_new_stream' should be called to create new streams.
351 int (*read_header)(struct AVFormatContext *,
352 AVFormatParameters *ap);
355 * Read one packet and put it in 'pkt'. pts and flags are also
356 * set. 'av_new_stream' can be called only if the flag
357 * AVFMTCTX_NOHEADER is used and only in the calling thread (not in a
358 * background thread).
359 * @return 0 on success, < 0 on error.
360 * When returning an error, pkt must not have been allocated
361 * or must be freed before returning
363 int (*read_packet)(struct AVFormatContext *, AVPacket *pkt);
366 * Close the stream. The AVFormatContext and AVStreams are not
367 * freed by this function
369 int (*read_close)(struct AVFormatContext *);
373 * Seek to a given timestamp relative to the frames in
374 * stream component stream_index.
375 * @param stream_index Must not be -1.
376 * @param flags Selects which direction should be preferred if no exact
377 * match is available.
378 * @return >= 0 on success (but not necessarily the new offset)
380 attribute_deprecated int (*read_seek)(struct AVFormatContext *,
381 int stream_index, int64_t timestamp, int flags);
384 * Gets the next timestamp in stream[stream_index].time_base units.
385 * @return the timestamp or AV_NOPTS_VALUE if an error occurred
387 int64_t (*read_timestamp)(struct AVFormatContext *s, int stream_index,
388 int64_t *pos, int64_t pos_limit);
391 * Can use flags: AVFMT_NOFILE, AVFMT_NEEDNUMBER.
396 * If extensions are defined, then no probe is done. You should
397 * usually not use extension format guessing because it is not
400 const char *extensions;
403 * General purpose read-only value that the format can use.
408 * Start/resume playing - only meaningful if using a network-based format
411 int (*read_play)(struct AVFormatContext *);
414 * Pause playing - only meaningful if using a network-based format
417 int (*read_pause)(struct AVFormatContext *);
419 const struct AVCodecTag * const *codec_tag;
422 * Seek to timestamp ts.
423 * Seeking will be done so that the point from which all active streams
424 * can be presented successfully will be closest to ts and within min/max_ts.
425 * Active streams are all streams that have AVStream.discard < AVDISCARD_ALL.
427 int (*read_seek2)(struct AVFormatContext *s, int stream_index, int64_t min_ts, int64_t ts, int64_t max_ts, int flags);
429 #if FF_API_OLD_METADATA2
430 const AVMetadataConv *metadata_conv;
433 const AVClass *priv_class; ///< AVClass for the private context
436 struct AVInputFormat *next;
439 enum AVStreamParseType {
441 AVSTREAM_PARSE_FULL, /**< full parsing and repack */
442 AVSTREAM_PARSE_HEADERS, /**< Only parse headers, do not repack. */
443 AVSTREAM_PARSE_TIMESTAMPS, /**< full parsing and interpolation of timestamps for frames not starting on a packet boundary */
444 AVSTREAM_PARSE_FULL_ONCE, /**< full parsing and repack of the first frame only, only implemented for H.264 currently */
447 typedef struct AVIndexEntry {
450 #define AVINDEX_KEYFRAME 0x0001
452 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).
453 int min_distance; /**< Minimum distance between this and the previous keyframe, used to avoid unneeded searching. */
456 #define AV_DISPOSITION_DEFAULT 0x0001
457 #define AV_DISPOSITION_DUB 0x0002
458 #define AV_DISPOSITION_ORIGINAL 0x0004
459 #define AV_DISPOSITION_COMMENT 0x0008
460 #define AV_DISPOSITION_LYRICS 0x0010
461 #define AV_DISPOSITION_KARAOKE 0x0020
464 * Track should be used during playback by default.
465 * Useful for subtitle track that should be displayed
466 * even when user did not explicitly ask for subtitles.
468 #define AV_DISPOSITION_FORCED 0x0040
469 #define AV_DISPOSITION_HEARING_IMPAIRED 0x0080 /**< stream for hearing impaired audiences */
470 #define AV_DISPOSITION_VISUAL_IMPAIRED 0x0100 /**< stream for visual impaired audiences */
471 #define AV_DISPOSITION_CLEAN_EFFECTS 0x0200 /**< stream without voice */
475 * New fields can be added to the end with minor version bumps.
476 * Removal, reordering and changes to existing fields require a major
478 * sizeof(AVStream) must not be used outside libav*.
480 typedef struct AVStream {
481 int index; /**< stream index in AVFormatContext */
482 int id; /**< format-specific stream ID */
483 AVCodecContext *codec; /**< codec context */
485 * Real base framerate of the stream.
486 * This is the lowest framerate with which all timestamps can be
487 * represented accurately (it is the least common multiple of all
488 * framerates in the stream). Note, this value is just a guess!
489 * For example, if the time base is 1/90000 and all frames have either
490 * approximately 3600 or 1800 timer ticks, then r_frame_rate will be 50/1.
492 AVRational r_frame_rate;
495 /* internal data used in av_find_stream_info() */
499 * encoding: pts generation when outputting stream
504 * This is the fundamental unit of time (in seconds) in terms
505 * of which frame timestamps are represented. For fixed-fps content,
506 * time base should be 1/framerate and timestamp increments should be 1.
507 * decoding: set by libavformat
508 * encoding: set by libavformat in av_write_header
510 AVRational time_base;
511 int pts_wrap_bits; /**< number of bits in pts (used for wrapping control) */
512 /* ffmpeg.c private use */
513 int stream_copy; /**< If set, just copy stream. */
514 enum AVDiscard discard; ///< Selects which packets can be discarded at will and do not need to be demuxed.
516 //FIXME move stuff to a flags field?
518 * Quality, as it has been removed from AVCodecContext and put in AVVideoFrame.
519 * MN: dunno if that is the right place for it
524 * Decoding: pts of the first frame of the stream, in stream time base.
525 * Only set this if you are absolutely 100% sure that the value you set
526 * it to really is the pts of the first frame.
527 * This may be undefined (AV_NOPTS_VALUE).
528 * @note The ASF header does NOT contain a correct start_time the ASF
529 * demuxer must NOT set this.
534 * Decoding: duration of the stream, in stream time base.
535 * If a source file does not specify a duration, but does specify
536 * a bitrate, this value will be estimated from bitrate and file size.
540 /* av_read_frame() support */
541 enum AVStreamParseType need_parsing;
542 struct AVCodecParserContext *parser;
545 int last_IP_duration;
547 /* av_seek_frame() support */
548 AVIndexEntry *index_entries; /**< Only used if the format does not
549 support seeking natively. */
550 int nb_index_entries;
551 unsigned int index_entries_allocated_size;
553 int64_t nb_frames; ///< number of frames in this stream if known or 0
555 int disposition; /**< AV_DISPOSITION_* bit field */
557 AVProbeData probe_data;
558 #define MAX_REORDER_DELAY 16
559 int64_t pts_buffer[MAX_REORDER_DELAY+1];
562 * sample aspect ratio (0 if unknown)
563 * - encoding: Set by user.
564 * - decoding: Set by libavformat.
566 AVRational sample_aspect_ratio;
568 AVMetadata *metadata;
570 /* Intended mostly for av_read_frame() support. Not supposed to be used by */
571 /* external applications; try to use something else if at all possible. */
572 const uint8_t *cur_ptr;
576 // Timestamp generation support:
578 * Timestamp corresponding to the last dts sync point.
580 * Initialized when AVCodecParserContext.dts_sync_point >= 0 and
581 * a DTS is received from the underlying container. Otherwise set to
582 * AV_NOPTS_VALUE by default.
584 int64_t reference_dts;
587 * Number of packets to buffer for codec probing
588 * NOT PART OF PUBLIC API
590 #define MAX_PROBE_PACKETS 2500
594 * last packet in packet_buffer for this stream when muxing.
595 * used internally, NOT PART OF PUBLIC API, dont read or write from outside of libav*
597 struct AVPacketList *last_in_packet_buffer;
602 AVRational avg_frame_rate;
605 * Number of frames that have been demuxed during av_find_stream_info()
607 int codec_info_nb_frames;
611 * This is the MPEG-TS stream identifier +1
614 int stream_identifier;
617 * Stream informations used internally by av_find_stream_info()
619 #define MAX_STD_TIMEBASES (60*12+5)
622 int64_t duration_gcd;
624 double duration_error[MAX_STD_TIMEBASES];
625 int64_t codec_info_duration;
629 * flag to indicate that probing is requested
630 * NOT PART OF PUBLIC API
635 #define AV_PROGRAM_RUNNING 1
638 * New fields can be added to the end with minor version bumps.
639 * Removal, reordering and changes to existing fields require a major
641 * sizeof(AVProgram) must not be used outside libav*.
643 typedef struct AVProgram {
646 enum AVDiscard discard; ///< selects which program to discard and which to feed to the caller
647 unsigned int *stream_index;
648 unsigned int nb_stream_indexes;
649 AVMetadata *metadata;
655 #define AVFMTCTX_NOHEADER 0x0001 /**< signal that no header is present
656 (streams are added dynamically) */
658 typedef struct AVChapter {
659 int id; ///< unique ID to identify the chapter
660 AVRational time_base; ///< time base in which the start/end timestamps are specified
661 int64_t start, end; ///< chapter start/end time in time_base units
662 AVMetadata *metadata;
666 * Format I/O context.
667 * New fields can be added to the end with minor version bumps.
668 * Removal, reordering and changes to existing fields require a major
670 * sizeof(AVFormatContext) must not be used outside libav*.
672 typedef struct AVFormatContext {
673 const AVClass *av_class; /**< Set by avformat_alloc_context. */
674 /* Can only be iformat or oformat, not both at the same time. */
675 struct AVInputFormat *iformat;
676 struct AVOutputFormat *oformat;
679 unsigned int nb_streams;
681 char filename[1024]; /**< input or output filename */
685 int ctx_flags; /**< Format-specific flags, see AVFMTCTX_xx */
686 /* private data for pts handling (do not modify directly). */
688 * This buffer is only needed when packets were already buffered but
689 * not decoded, for example to get the codec parameters in MPEG
692 struct AVPacketList *packet_buffer;
695 * Decoding: position of the first frame of the component, in
696 * AV_TIME_BASE fractional seconds. NEVER set this value directly:
697 * It is deduced from the AVStream values.
702 * Decoding: duration of the stream, in AV_TIME_BASE fractional
703 * seconds. Only set this value if you know none of the individual stream
704 * durations and also dont set any of them. This is deduced from the
705 * AVStream values if not set.
710 * decoding: total file size, 0 if unknown
715 * Decoding: total stream bitrate in bit/s, 0 if not
716 * available. Never set it directly if the file_size and the
717 * duration are known as FFmpeg can compute it automatically.
721 /* av_read_frame() support */
724 /* av_seek_frame() support */
725 int64_t data_offset; /**< offset of the first packet */
728 unsigned int packet_size;
732 #define AVFMT_NOOUTPUTLOOP -1
733 #define AVFMT_INFINITEOUTPUTLOOP 0
735 * number of times to loop output in formats that support it
740 #define AVFMT_FLAG_GENPTS 0x0001 ///< Generate missing pts even if it requires parsing future frames.
741 #define AVFMT_FLAG_IGNIDX 0x0002 ///< Ignore index.
742 #define AVFMT_FLAG_NONBLOCK 0x0004 ///< Do not block when reading packets from input.
743 #define AVFMT_FLAG_IGNDTS 0x0008 ///< Ignore DTS on frames that contain both DTS & PTS
744 #define AVFMT_FLAG_NOFILLIN 0x0010 ///< Do not infer any values from other values, just return what is stored in the container
745 #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
746 #if FF_API_FLAG_RTP_HINT
747 #define AVFMT_FLAG_RTP_HINT 0x0040 ///< Deprecated, use the -movflags rtphint muxer specific AVOption instead
749 #define AVFMT_FLAG_MP4A_LATM 0x0080 ///< Enable RTP MP4A-LATM payload
750 #define AVFMT_FLAG_SORT_DTS 0x10000 ///< try to interleave outputted packets by dts (using this flag can slow demuxing down)
751 #define AVFMT_FLAG_PRIV_OPT 0x20000 ///< Enable use of private options by delaying codec open (this could be made default once all code is converted)
752 #define AVFMT_FLAG_KEEP_SIDE_DATA 0x40000 ///< Dont merge side data but keep it seperate.
756 * decoding: size of data to probe; encoding: unused.
758 unsigned int probesize;
761 * Maximum time (in AV_TIME_BASE units) during which the input should
762 * be analyzed in av_find_stream_info().
764 int max_analyze_duration;
769 unsigned int nb_programs;
770 AVProgram **programs;
773 * Forced video codec_id.
774 * Demuxing: Set by user.
776 enum CodecID video_codec_id;
779 * Forced audio codec_id.
780 * Demuxing: Set by user.
782 enum CodecID audio_codec_id;
785 * Forced subtitle codec_id.
786 * Demuxing: Set by user.
788 enum CodecID subtitle_codec_id;
791 * Maximum amount of memory in bytes to use for the index of each stream.
792 * If the index exceeds this size, entries will be discarded as
793 * needed to maintain a smaller size. This can lead to slower or less
794 * accurate seeking (depends on demuxer).
795 * Demuxers for which a full in-memory index is mandatory will ignore
798 * demuxing: set by user
800 unsigned int max_index_size;
803 * Maximum amount of memory in bytes to use for buffering frames
804 * obtained from realtime capture devices.
806 unsigned int max_picture_buffer;
808 unsigned int nb_chapters;
809 AVChapter **chapters;
812 * Flags to enable debugging.
815 #define FF_FDEBUG_TS 0x0001
818 * Raw packets from the demuxer, prior to parsing and decoding.
819 * This buffer is used for buffering packets until the codec can
820 * be identified, as parsing cannot be done without knowing the
823 struct AVPacketList *raw_packet_buffer;
824 struct AVPacketList *raw_packet_buffer_end;
826 struct AVPacketList *packet_buffer_end;
828 AVMetadata *metadata;
831 * Remaining size available for raw_packet_buffer, in bytes.
832 * NOT PART OF PUBLIC API
834 #define RAW_PACKET_BUFFER_SIZE 2500000
835 int raw_packet_buffer_remaining_size;
838 * Start time of the stream in real world time, in microseconds
839 * since the unix epoch (00:00 1st January 1970). That is, pts=0
840 * in the stream was captured at this real world time.
841 * - encoding: Set by user.
842 * - decoding: Unused.
844 int64_t start_time_realtime;
847 * decoding: number of frames used to probe fps
852 * Transport stream id.
853 * This will be moved into demuxer private options. Thus no API/ABI compatibility
858 typedef struct AVPacketList {
860 struct AVPacketList *next;
864 * If f is NULL, returns the first registered input format,
865 * if f is non-NULL, returns the next registered input format after f
866 * or NULL if f is the last one.
868 AVInputFormat *av_iformat_next(AVInputFormat *f);
871 * If f is NULL, returns the first registered output format,
872 * if f is non-NULL, returns the next registered output format after f
873 * or NULL if f is the last one.
875 AVOutputFormat *av_oformat_next(AVOutputFormat *f);
877 #if FF_API_GUESS_IMG2_CODEC
878 attribute_deprecated enum CodecID av_guess_image2_codec(const char *filename);
881 /* XXX: Use automatic init with either ELF sections or C file parser */
885 void av_register_input_format(AVInputFormat *format);
886 void av_register_output_format(AVOutputFormat *format);
889 * Return the output format in the list of registered output formats
890 * which best matches the provided parameters, or return NULL if
893 * @param short_name if non-NULL checks if short_name matches with the
894 * names of the registered formats
895 * @param filename if non-NULL checks if filename terminates with the
896 * extensions of the registered formats
897 * @param mime_type if non-NULL checks if mime_type matches with the
898 * MIME type of the registered formats
900 AVOutputFormat *av_guess_format(const char *short_name,
901 const char *filename,
902 const char *mime_type);
905 * Guess the codec ID based upon muxer and filename.
907 enum CodecID av_guess_codec(AVOutputFormat *fmt, const char *short_name,
908 const char *filename, const char *mime_type,
909 enum AVMediaType type);
912 * Send a nice hexadecimal dump of a buffer to the specified file stream.
914 * @param f The file stream pointer where the dump should be sent to.
916 * @param size buffer size
918 * @see av_hex_dump_log, av_pkt_dump2, av_pkt_dump_log2
920 void av_hex_dump(FILE *f, uint8_t *buf, int size);
923 * Send a nice hexadecimal dump of a buffer to the log.
925 * @param avcl A pointer to an arbitrary struct of which the first field is a
926 * pointer to an AVClass struct.
927 * @param level The importance level of the message, lower values signifying
930 * @param size buffer size
932 * @see av_hex_dump, av_pkt_dump2, av_pkt_dump_log2
934 void av_hex_dump_log(void *avcl, int level, uint8_t *buf, int size);
937 * Send a nice dump of a packet to the specified file stream.
939 * @param f The file stream pointer where the dump should be sent to.
940 * @param pkt packet to dump
941 * @param dump_payload True if the payload must be displayed, too.
942 * @param st AVStream that the packet belongs to
944 void av_pkt_dump2(FILE *f, AVPacket *pkt, int dump_payload, AVStream *st);
948 * Send a nice dump of a packet to the log.
950 * @param avcl A pointer to an arbitrary struct of which the first field is a
951 * pointer to an AVClass struct.
952 * @param level The importance level of the message, lower values signifying
954 * @param pkt packet to dump
955 * @param dump_payload True if the payload must be displayed, too.
956 * @param st AVStream that the packet belongs to
958 void av_pkt_dump_log2(void *avcl, int level, AVPacket *pkt, int dump_payload,
962 attribute_deprecated void av_pkt_dump(FILE *f, AVPacket *pkt, int dump_payload);
963 attribute_deprecated void av_pkt_dump_log(void *avcl, int level, AVPacket *pkt,
968 * Initialize libavformat and register all the muxers, demuxers and
969 * protocols. If you do not call this function, then you can select
970 * exactly which formats you want to support.
972 * @see av_register_input_format()
973 * @see av_register_output_format()
974 * @see av_register_protocol()
976 void av_register_all(void);
979 * Get the CodecID for the given codec tag tag.
980 * If no codec id is found returns CODEC_ID_NONE.
982 * @param tags list of supported codec_id-codec_tag pairs, as stored
983 * in AVInputFormat.codec_tag and AVOutputFormat.codec_tag
985 enum CodecID av_codec_get_id(const struct AVCodecTag * const *tags, unsigned int tag);
988 * Get the codec tag for the given codec id id.
989 * If no codec tag is found returns 0.
991 * @param tags list of supported codec_id-codec_tag pairs, as stored
992 * in AVInputFormat.codec_tag and AVOutputFormat.codec_tag
994 unsigned int av_codec_get_tag(const struct AVCodecTag * const *tags, enum CodecID id);
996 /* media file input */
999 * Find AVInputFormat based on the short name of the input format.
1001 AVInputFormat *av_find_input_format(const char *short_name);
1004 * Guess the file format.
1006 * @param is_opened Whether the file is already opened; determines whether
1007 * demuxers with or without AVFMT_NOFILE are probed.
1009 AVInputFormat *av_probe_input_format(AVProbeData *pd, int is_opened);
1012 * Guess the file format.
1014 * @param is_opened Whether the file is already opened; determines whether
1015 * demuxers with or without AVFMT_NOFILE are probed.
1016 * @param score_max A probe score larger that this is required to accept a
1017 * detection, the variable is set to the actual detection
1019 * If the score is <= AVPROBE_SCORE_MAX / 4 it is recommended
1020 * to retry with a larger probe buffer.
1022 AVInputFormat *av_probe_input_format2(AVProbeData *pd, int is_opened, int *score_max);
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.
1029 * @param score_ret The score of the best detection.
1031 AVInputFormat *av_probe_input_format3(AVProbeData *pd, int is_opened, int *score_ret);
1034 * Probe a bytestream to determine the input format. Each time a probe returns
1035 * with a score that is too low, the probe buffer size is increased and another
1036 * attempt is made. When the maximum probe size is reached, the input format
1037 * with the highest score is returned.
1039 * @param pb the bytestream to probe
1040 * @param fmt the input format is put here
1041 * @param filename the filename of the stream
1042 * @param logctx the log context
1043 * @param offset the offset within the bytestream to probe from
1044 * @param max_probe_size the maximum probe buffer size (zero for default)
1045 * @return 0 in case of success, a negative value corresponding to an
1046 * AVERROR code otherwise
1048 int av_probe_input_buffer(AVIOContext *pb, AVInputFormat **fmt,
1049 const char *filename, void *logctx,
1050 unsigned int offset, unsigned int max_probe_size);
1053 * Allocate all the structures needed to read an input stream.
1054 * This does not open the needed codecs for decoding the stream[s].
1056 int av_open_input_stream(AVFormatContext **ic_ptr,
1057 AVIOContext *pb, const char *filename,
1058 AVInputFormat *fmt, AVFormatParameters *ap);
1061 * Open a media file as input. The codecs are not opened. Only the file
1062 * header (if present) is read.
1064 * @param ic_ptr The opened media file handle is put here.
1065 * @param filename filename to open
1066 * @param fmt If non-NULL, force the file format to use.
1067 * @param buf_size optional buffer size (zero if default is OK)
1068 * @param ap Additional parameters needed when opening the file
1069 * (NULL if default).
1070 * @return 0 if OK, AVERROR_xxx otherwise
1072 int av_open_input_file(AVFormatContext **ic_ptr, const char *filename,
1075 AVFormatParameters *ap);
1077 int av_demuxer_open(AVFormatContext *ic, AVFormatParameters *ap);
1080 * Allocate an AVFormatContext.
1081 * avformat_free_context() can be used to free the context and everything
1082 * allocated by the framework within it.
1084 AVFormatContext *avformat_alloc_context(void);
1086 #if FF_API_ALLOC_OUTPUT_CONTEXT
1088 * @deprecated deprecated in favor of avformat_alloc_output_context2()
1090 attribute_deprecated
1091 AVFormatContext *avformat_alloc_output_context(const char *format,
1092 AVOutputFormat *oformat,
1093 const char *filename);
1097 * Allocate an AVFormatContext for an output format.
1098 * avformat_free_context() can be used to free the context and
1099 * everything allocated by the framework within it.
1101 * @param *ctx is set to the created format context, or to NULL in
1103 * @param oformat format to use for allocating the context, if NULL
1104 * format_name and filename are used instead
1105 * @param format_name the name of output format to use for allocating the
1106 * context, if NULL filename is used instead
1107 * @param filename the name of the filename to use for allocating the
1108 * context, may be NULL
1109 * @return >= 0 in case of success, a negative AVERROR code in case of
1112 int avformat_alloc_output_context2(AVFormatContext **ctx, AVOutputFormat *oformat,
1113 const char *format_name, const char *filename);
1116 * Read packets of a media file to get stream information. This
1117 * is useful for file formats with no headers such as MPEG. This
1118 * function also computes the real framerate in case of MPEG-2 repeat
1120 * The logical file position is not changed by this function;
1121 * examined packets may be buffered for later processing.
1123 * @param ic media file handle
1124 * @return >=0 if OK, AVERROR_xxx on error
1125 * @todo Let the user decide somehow what information is needed so that
1126 * we do not waste time getting stuff the user does not need.
1128 int av_find_stream_info(AVFormatContext *ic);
1131 * Find the "best" stream in the file.
1132 * The best stream is determined according to various heuristics as the most
1133 * likely to be what the user expects.
1134 * If the decoder parameter is non-NULL, av_find_best_stream will find the
1135 * default decoder for the stream's codec; streams for which no decoder can
1136 * be found are ignored.
1138 * @param ic media file handle
1139 * @param type stream type: video, audio, subtitles, etc.
1140 * @param wanted_stream_nb user-requested stream number,
1141 * or -1 for automatic selection
1142 * @param related_stream try to find a stream related (eg. in the same
1143 * program) to this one, or -1 if none
1144 * @param decoder_ret if non-NULL, returns the decoder for the
1146 * @param flags flags; none are currently defined
1147 * @return the non-negative stream number in case of success,
1148 * AVERROR_STREAM_NOT_FOUND if no stream with the requested type
1150 * AVERROR_DECODER_NOT_FOUND if streams were found but no decoder
1151 * @note If av_find_best_stream returns successfully and decoder_ret is not
1152 * NULL, then *decoder_ret is guaranteed to be set to a valid AVCodec.
1154 int av_find_best_stream(AVFormatContext *ic,
1155 enum AVMediaType type,
1156 int wanted_stream_nb,
1158 AVCodec **decoder_ret,
1162 * Read a transport packet from a media file.
1164 * This function is obsolete and should never be used.
1165 * Use av_read_frame() instead.
1167 * @param s media file handle
1168 * @param pkt is filled
1169 * @return 0 if OK, AVERROR_xxx on error
1171 int av_read_packet(AVFormatContext *s, AVPacket *pkt);
1174 * Return the next frame of a stream.
1175 * This function returns what is stored in the file, and does not validate
1176 * that what is there are valid frames for the decoder. It will split what is
1177 * stored in the file into frames and return one for each call. It will not
1178 * omit invalid data between valid frames so as to give the decoder the maximum
1179 * information possible for decoding.
1181 * The returned packet is valid
1182 * until the next av_read_frame() or until av_close_input_file() and
1183 * must be freed with av_free_packet. For video, the packet contains
1184 * exactly one frame. For audio, it contains an integer number of
1185 * frames if each frame has a known fixed size (e.g. PCM or ADPCM
1186 * data). If the audio frames have a variable size (e.g. MPEG audio),
1187 * then it contains one frame.
1189 * pkt->pts, pkt->dts and pkt->duration are always set to correct
1190 * values in AVStream.time_base units (and guessed if the format cannot
1191 * provide them). pkt->pts can be AV_NOPTS_VALUE if the video format
1192 * has B-frames, so it is better to rely on pkt->dts if you do not
1193 * decompress the payload.
1195 * @return 0 if OK, < 0 on error or end of file
1197 int av_read_frame(AVFormatContext *s, AVPacket *pkt);
1200 * Seek to the keyframe at timestamp.
1201 * 'timestamp' in 'stream_index'.
1202 * @param stream_index If stream_index is (-1), a default
1203 * stream is selected, and timestamp is automatically converted
1204 * from AV_TIME_BASE units to the stream specific time_base.
1205 * @param timestamp Timestamp in AVStream.time_base units
1206 * or, if no stream is specified, in AV_TIME_BASE units.
1207 * @param flags flags which select direction and seeking mode
1208 * @return >= 0 on success
1210 int av_seek_frame(AVFormatContext *s, int stream_index, int64_t timestamp,
1214 * Seek to timestamp ts.
1215 * Seeking will be done so that the point from which all active streams
1216 * can be presented successfully will be closest to ts and within min/max_ts.
1217 * Active streams are all streams that have AVStream.discard < AVDISCARD_ALL.
1219 * If flags contain AVSEEK_FLAG_BYTE, then all timestamps are in bytes and
1220 * are the file position (this may not be supported by all demuxers).
1221 * If flags contain AVSEEK_FLAG_FRAME, then all timestamps are in frames
1222 * in the stream with stream_index (this may not be supported by all demuxers).
1223 * Otherwise all timestamps are in units of the stream selected by stream_index
1224 * or if stream_index is -1, in AV_TIME_BASE units.
1225 * If flags contain AVSEEK_FLAG_ANY, then non-keyframes are treated as
1226 * keyframes (this may not be supported by all demuxers).
1228 * @param stream_index index of the stream which is used as time base reference
1229 * @param min_ts smallest acceptable timestamp
1230 * @param ts target timestamp
1231 * @param max_ts largest acceptable timestamp
1232 * @param flags flags
1233 * @return >=0 on success, error code otherwise
1235 * @note This is part of the new seek API which is still under construction.
1236 * Thus do not use this yet. It may change at any time, do not expect
1237 * ABI compatibility yet!
1239 int avformat_seek_file(AVFormatContext *s, int stream_index, int64_t min_ts, int64_t ts, int64_t max_ts, int flags);
1242 * Start playing a network-based stream (e.g. RTSP stream) at the
1245 int av_read_play(AVFormatContext *s);
1248 * Pause a network-based stream (e.g. RTSP stream).
1250 * Use av_read_play() to resume it.
1252 int av_read_pause(AVFormatContext *s);
1255 * Free a AVFormatContext allocated by av_open_input_stream.
1256 * @param s context to free
1258 void av_close_input_stream(AVFormatContext *s);
1261 * Close a media file (but not its codecs).
1263 * @param s media file handle
1265 void av_close_input_file(AVFormatContext *s);
1268 * Free an AVFormatContext and all its streams.
1269 * @param s context to free
1271 void avformat_free_context(AVFormatContext *s);
1274 * Add a new stream to a media file.
1276 * Can only be called in the read_header() function. If the flag
1277 * AVFMTCTX_NOHEADER is in the format context, then new streams
1278 * can be added in read_packet too.
1280 * @param s media file handle
1281 * @param id file-format-dependent stream ID
1283 AVStream *av_new_stream(AVFormatContext *s, int id);
1284 AVProgram *av_new_program(AVFormatContext *s, int id);
1287 * Set the pts for a given stream. If the new values would be invalid
1288 * (<= 0), it leaves the AVStream unchanged.
1291 * @param pts_wrap_bits number of bits effectively used by the pts
1292 * (used for wrap control, 33 is the value for MPEG)
1293 * @param pts_num numerator to convert to seconds (MPEG: 1)
1294 * @param pts_den denominator to convert to seconds (MPEG: 90000)
1296 void av_set_pts_info(AVStream *s, int pts_wrap_bits,
1297 unsigned int pts_num, unsigned int pts_den);
1299 #define AVSEEK_FLAG_BACKWARD 1 ///< seek backward
1300 #define AVSEEK_FLAG_BYTE 2 ///< seeking based on position in bytes
1301 #define AVSEEK_FLAG_ANY 4 ///< seek to any frame, even non-keyframes
1302 #define AVSEEK_FLAG_FRAME 8 ///< seeking based on frame number
1304 int av_find_default_stream_index(AVFormatContext *s);
1307 * Get the index for a specific timestamp.
1308 * @param flags if AVSEEK_FLAG_BACKWARD then the returned index will correspond
1309 * to the timestamp which is <= the requested one, if backward
1310 * is 0, then it will be >=
1311 * if AVSEEK_FLAG_ANY seek to any frame, only keyframes otherwise
1312 * @return < 0 if no such timestamp could be found
1314 int av_index_search_timestamp(AVStream *st, int64_t timestamp, int flags);
1317 * Add an index entry into a sorted list. Update the entry if the list
1318 * already contains it.
1320 * @param timestamp timestamp in the time base of the given stream
1322 int av_add_index_entry(AVStream *st, int64_t pos, int64_t timestamp,
1323 int size, int distance, int flags);
1326 * Perform a binary search using av_index_search_timestamp() and
1327 * AVInputFormat.read_timestamp().
1328 * This is not supposed to be called directly by a user application,
1330 * @param target_ts target timestamp in the time base of the given stream
1331 * @param stream_index stream number
1333 int av_seek_frame_binary(AVFormatContext *s, int stream_index,
1334 int64_t target_ts, int flags);
1337 * Update cur_dts of all streams based on the given timestamp and AVStream.
1339 * Stream ref_st unchanged, others set cur_dts in their native time base.
1340 * Only needed for timestamp wrapping or if (dts not set and pts!=dts).
1341 * @param timestamp new dts expressed in time_base of param ref_st
1342 * @param ref_st reference stream giving time_base of param timestamp
1344 void av_update_cur_dts(AVFormatContext *s, AVStream *ref_st, int64_t timestamp);
1347 * Perform a binary search using read_timestamp().
1348 * This is not supposed to be called directly by a user application,
1350 * @param target_ts target timestamp in the time base of the given stream
1351 * @param stream_index stream number
1353 int64_t av_gen_search(AVFormatContext *s, int stream_index,
1354 int64_t target_ts, int64_t pos_min,
1355 int64_t pos_max, int64_t pos_limit,
1356 int64_t ts_min, int64_t ts_max,
1357 int flags, int64_t *ts_ret,
1358 int64_t (*read_timestamp)(struct AVFormatContext *, int , int64_t *, int64_t ));
1363 attribute_deprecated int av_set_parameters(AVFormatContext *s, AVFormatParameters *ap);
1366 * Split a URL string into components.
1368 * The pointers to buffers for storing individual components may be null,
1369 * in order to ignore that component. Buffers for components not found are
1370 * set to empty strings. If the port is not found, it is set to a negative
1373 * @param proto the buffer for the protocol
1374 * @param proto_size the size of the proto buffer
1375 * @param authorization the buffer for the authorization
1376 * @param authorization_size the size of the authorization buffer
1377 * @param hostname the buffer for the host name
1378 * @param hostname_size the size of the hostname buffer
1379 * @param port_ptr a pointer to store the port number in
1380 * @param path the buffer for the path
1381 * @param path_size the size of the path buffer
1382 * @param url the URL to split
1384 void av_url_split(char *proto, int proto_size,
1385 char *authorization, int authorization_size,
1386 char *hostname, int hostname_size,
1388 char *path, int path_size,
1392 * Allocate the stream private data and write the stream header to an
1393 * output media file.
1394 * @note: this sets stream time-bases, if possible to stream->codec->time_base
1395 * but for some formats it might also be some other time base
1397 * @param s media file handle
1398 * @return 0 if OK, AVERROR_xxx on error
1400 int av_write_header(AVFormatContext *s);
1403 * Write a packet to an output media file.
1405 * The packet shall contain one audio or video frame.
1406 * The packet must be correctly interleaved according to the container
1407 * specification, if not then av_interleaved_write_frame must be used.
1409 * @param s media file handle
1410 * @param pkt The packet, which contains the stream_index, buf/buf_size,
1412 * @return < 0 on error, = 0 if OK, 1 if end of stream wanted
1414 int av_write_frame(AVFormatContext *s, AVPacket *pkt);
1417 * Write a packet to an output media file ensuring correct interleaving.
1419 * The packet must contain one audio or video frame.
1420 * If the packets are already correctly interleaved, the application should
1421 * call av_write_frame() instead as it is slightly faster. It is also important
1422 * to keep in mind that completely non-interleaved input will need huge amounts
1423 * of memory to interleave with this, so it is preferable to interleave at the
1426 * @param s media file handle
1427 * @param pkt The packet, which contains the stream_index, buf/buf_size,
1429 * @return < 0 on error, = 0 if OK, 1 if end of stream wanted
1431 int av_interleaved_write_frame(AVFormatContext *s, AVPacket *pkt);
1434 * Interleave a packet per dts in an output media file.
1436 * Packets with pkt->destruct == av_destruct_packet will be freed inside this
1437 * function, so they cannot be used after it. Note that calling av_free_packet()
1438 * on them is still safe.
1440 * @param s media file handle
1441 * @param out the interleaved packet will be output here
1442 * @param pkt the input packet
1443 * @param flush 1 if no further packets are available as input and all
1444 * remaining packets should be output
1445 * @return 1 if a packet was output, 0 if no packet could be output,
1446 * < 0 if an error occurred
1448 int av_interleave_packet_per_dts(AVFormatContext *s, AVPacket *out,
1449 AVPacket *pkt, int flush);
1452 * Write the stream trailer to an output media file and free the
1453 * file private data.
1455 * May only be called after a successful call to av_write_header.
1457 * @param s media file handle
1458 * @return 0 if OK, AVERROR_xxx on error
1460 int av_write_trailer(AVFormatContext *s);
1462 #if FF_API_DUMP_FORMAT
1463 attribute_deprecated void dump_format(AVFormatContext *ic,
1469 void av_dump_format(AVFormatContext *ic,
1474 #if FF_API_PARSE_DATE
1476 * Parse datestr and return a corresponding number of microseconds.
1478 * @param datestr String representing a date or a duration.
1479 * See av_parse_time() for the syntax of the provided string.
1480 * @deprecated in favor of av_parse_time()
1482 attribute_deprecated
1483 int64_t parse_date(const char *datestr, int duration);
1487 * Get the current time in microseconds.
1489 int64_t av_gettime(void);
1491 #if FF_API_FIND_INFO_TAG
1493 * @deprecated use av_find_info_tag in libavutil instead.
1495 attribute_deprecated int find_info_tag(char *arg, int arg_size, const char *tag1, const char *info);
1499 * Return in 'buf' the path with '%d' replaced by a number.
1501 * Also handles the '%0nd' format where 'n' is the total number
1502 * of digits and '%%'.
1504 * @param buf destination buffer
1505 * @param buf_size destination buffer size
1506 * @param path numbered sequence string
1507 * @param number frame number
1508 * @return 0 if OK, -1 on format error
1510 int av_get_frame_filename(char *buf, int buf_size,
1511 const char *path, int number);
1514 * Check whether filename actually is a numbered sequence generator.
1516 * @param filename possible numbered sequence string
1517 * @return 1 if a valid numbered sequence string, 0 otherwise
1519 int av_filename_number_test(const char *filename);
1522 * Generate an SDP for an RTP session.
1524 * @param ac array of AVFormatContexts describing the RTP streams. If the
1525 * array is composed by only one context, such context can contain
1526 * multiple AVStreams (one AVStream per RTP stream). Otherwise,
1527 * all the contexts in the array (an AVCodecContext per RTP stream)
1528 * must contain only one AVStream.
1529 * @param n_files number of AVCodecContexts contained in ac
1530 * @param buf buffer where the SDP will be stored (must be allocated by
1532 * @param size the size of the buffer
1533 * @return 0 if OK, AVERROR_xxx on error
1535 int av_sdp_create(AVFormatContext *ac[], int n_files, char *buf, int size);
1537 #if FF_API_SDP_CREATE
1538 attribute_deprecated int avf_sdp_create(AVFormatContext *ac[], int n_files, char *buff, int size);
1542 * Return a positive value if the given filename has one of the given
1543 * extensions, 0 otherwise.
1545 * @param extensions a comma-separated list of filename extensions
1547 int av_match_ext(const char *filename, const char *extensions);
1549 #endif /* AVFORMAT_AVFORMAT_H */