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
24 #define LIBAVFORMAT_VERSION_MAJOR 52
25 #define LIBAVFORMAT_VERSION_MINOR 82
26 #define LIBAVFORMAT_VERSION_MICRO 0
28 #define LIBAVFORMAT_VERSION_INT AV_VERSION_INT(LIBAVFORMAT_VERSION_MAJOR, \
29 LIBAVFORMAT_VERSION_MINOR, \
30 LIBAVFORMAT_VERSION_MICRO)
31 #define LIBAVFORMAT_VERSION AV_VERSION(LIBAVFORMAT_VERSION_MAJOR, \
32 LIBAVFORMAT_VERSION_MINOR, \
33 LIBAVFORMAT_VERSION_MICRO)
34 #define LIBAVFORMAT_BUILD LIBAVFORMAT_VERSION_INT
36 #define LIBAVFORMAT_IDENT "Lavf" AV_STRINGIFY(LIBAVFORMAT_VERSION)
39 * Those FF_API_* defines are not part of public API.
40 * They may change, break or disappear at any time.
42 #ifndef FF_API_MAX_STREAMS
43 #define FF_API_MAX_STREAMS (LIBAVFORMAT_VERSION_MAJOR < 53)
45 #ifndef FF_API_OLD_METADATA
46 #define FF_API_OLD_METADATA (LIBAVFORMAT_VERSION_MAJOR < 53)
48 #ifndef FF_API_URL_CLASS
49 #define FF_API_URL_CLASS (LIBAVFORMAT_VERSION_MAJOR >= 53)
51 #ifndef FF_API_URL_RESETBUF
52 #define FF_API_URL_RESETBUF (LIBAVFORMAT_VERSION_MAJOR < 53)
54 #ifndef FF_API_REGISTER_PROTOCOL
55 #define FF_API_REGISTER_PROTOCOL (LIBAVFORMAT_VERSION_MAJOR < 53)
57 #ifndef FF_API_GUESS_FORMAT
58 #define FF_API_GUESS_FORMAT (LIBAVFORMAT_VERSION_MAJOR < 53)
60 #ifndef FF_API_UDP_GET_FILE
61 #define FF_API_UDP_GET_FILE (LIBAVFORMAT_VERSION_MAJOR < 53)
63 #ifndef FF_API_URL_SPLIT
64 #define FF_API_URL_SPLIT (LIBAVFORMAT_VERSION_MAJOR < 53)
66 #ifndef FF_API_ALLOC_FORMAT_CONTEXT
67 #define FF_API_ALLOC_FORMAT_CONTEXT (LIBAVFORMAT_VERSION_MAJOR < 53)
69 #ifndef FF_API_PARSE_FRAME_PARAM
70 #define FF_API_PARSE_FRAME_PARAM (LIBAVFORMAT_VERSION_MAJOR < 53)
72 #ifndef FF_API_READ_SEEK
73 #define FF_API_READ_SEEK (LIBAVFORMAT_VERSION_MAJOR < 54)
75 #ifndef FF_API_LAVF_UNUSED
76 #define FF_API_LAVF_UNUSED (LIBAVFORMAT_VERSION_MAJOR < 53)
78 #ifndef FF_API_PARAMETERS_CODEC_ID
79 #define FF_API_PARAMETERS_CODEC_ID (LIBAVFORMAT_VERSION_MAJOR < 53)
81 #ifndef FF_API_FIRST_FORMAT
82 #define FF_API_FIRST_FORMAT (LIBAVFORMAT_VERSION_MAJOR < 53)
86 * I return the LIBAVFORMAT_VERSION_INT constant. You got
87 * a fucking problem with that, douchebag?
89 unsigned avformat_version(void);
92 * Return the libavformat build-time configuration.
94 const char *avformat_configuration(void);
97 * Return the libavformat license.
99 const char *avformat_license(void);
102 #include <stdio.h> /* FILE */
103 #include "libavcodec/avcodec.h"
107 struct AVFormatContext;
111 * Public Metadata API.
112 * The metadata API allows libavformat to export metadata tags to a client
113 * application using a sequence of key/value pairs. Like all strings in FFmpeg,
114 * metadata must be stored as UTF-8 encoded Unicode. Note that metadata
115 * exported by demuxers isn't checked to be valid UTF-8 in most cases.
116 * Important concepts to keep in mind:
117 * 1. Keys are unique; there can never be 2 tags with the same key. This is
118 * also meant semantically, i.e., a demuxer should not knowingly produce
119 * several keys that are literally different but semantically identical.
120 * E.g., key=Author5, key=Author6. In this example, all authors must be
121 * placed in the same tag.
122 * 2. Metadata is flat, not hierarchical; there are no subtags. If you
123 * want to store, e.g., the email address of the child of producer Alice
124 * and actor Bob, that could have key=alice_and_bobs_childs_email_address.
125 * 3. Several modifiers can be applied to the tag name. This is done by
126 * appending a dash character ('-') and the modifier name in the order
127 * they appear in the list below -- e.g. foo-eng-sort, not foo-sort-eng.
128 * a) language -- a tag whose value is localized for a particular language
129 * is appended with the ISO 639-2/B 3-letter language code.
130 * For example: Author-ger=Michael, Author-eng=Mike
131 * The original/default language is in the unqualified "Author" tag.
132 * A demuxer should set a default if it sets any translated tag.
133 * b) sorting -- a modified version of a tag that should be used for
134 * sorting will have '-sort' appended. E.g. artist="The Beatles",
135 * artist-sort="Beatles, The".
137 * 4. Tag names are normally exported exactly as stored in the container to
138 * allow lossless remuxing to the same format. For container-independent
139 * handling of metadata, av_metadata_conv() can convert it to ffmpeg generic
140 * format. Follows a list of generic tag names:
142 * album -- name of the set this work belongs to
143 * album_artist -- main creator of the set/album, if different from artist.
144 * e.g. "Various Artists" for compilation albums.
145 * artist -- main creator of the work
146 * comment -- any additional description of the file.
147 * composer -- who composed the work, if different from artist.
148 * copyright -- name of copyright holder.
149 * date -- date when the work was created, preferably in ISO 8601.
150 * disc -- number of a subset, e.g. disc in a multi-disc collection.
151 * encoder -- name/settings of the software/hardware that produced the file.
152 * encoded_by -- person/group who created the file.
153 * filename -- original name of the file.
154 * genre -- <self-evident>.
155 * language -- main language in which the work is performed, preferably
156 * in ISO 639-2 format.
157 * performer -- artist who performed the work, if different from artist.
158 * E.g for "Also sprach Zarathustra", artist would be "Richard
159 * Strauss" and performer "London Philharmonic Orchestra".
160 * publisher -- name of the label/publisher.
161 * title -- name of the work.
162 * track -- number of this work in the set, can be in form current/total.
165 #define AV_METADATA_MATCH_CASE 1
166 #define AV_METADATA_IGNORE_SUFFIX 2
167 #define AV_METADATA_DONT_STRDUP_KEY 4
168 #define AV_METADATA_DONT_STRDUP_VAL 8
169 #define AV_METADATA_DONT_OVERWRITE 16 ///< Don't overwrite existing tags.
176 typedef struct AVMetadata AVMetadata;
177 typedef struct AVMetadataConv AVMetadataConv;
180 * Get a metadata element with matching key.
182 * @param prev Set to the previous matching element to find the next.
183 * If set to NULL the first matching element is returned.
184 * @param flags Allows case as well as suffix-insensitive comparisons.
185 * @return Found tag or NULL, changing key or value leads to undefined behavior.
188 av_metadata_get(AVMetadata *m, const char *key, const AVMetadataTag *prev, int flags);
190 #if FF_API_OLD_METADATA
192 * Set the given tag in *pm, overwriting an existing tag.
194 * @param pm pointer to a pointer to a metadata struct. If *pm is NULL
195 * a metadata struct is allocated and put in *pm.
196 * @param key tag key to add to *pm (will be av_strduped)
197 * @param value tag value to add to *pm (will be av_strduped)
198 * @return >= 0 on success otherwise an error code <0
199 * @deprecated Use av_metadata_set2() instead.
201 attribute_deprecated int av_metadata_set(AVMetadata **pm, const char *key, const char *value);
205 * Set the given tag in *pm, overwriting an existing tag.
207 * @param pm pointer to a pointer to a metadata struct. If *pm is NULL
208 * a metadata struct is allocated and put in *pm.
209 * @param key tag key to add to *pm (will be av_strduped depending on flags)
210 * @param value tag value to add to *pm (will be av_strduped depending on flags).
211 * Passing a NULL value will cause an existing tag to be deleted.
212 * @return >= 0 on success otherwise an error code <0
214 int av_metadata_set2(AVMetadata **pm, const char *key, const char *value, int flags);
217 * Convert all the metadata sets from ctx according to the source and
218 * destination conversion tables. If one of the tables is NULL, then
219 * tags are converted to/from ffmpeg generic tag names.
221 * @param d_conv destination tags format conversion table
222 * @param s_conv source tags format conversion table
224 void av_metadata_conv(struct AVFormatContext *ctx, const AVMetadataConv *d_conv,
225 const AVMetadataConv *s_conv);
228 * Free all the memory allocated for an AVMetadata struct.
230 void av_metadata_free(AVMetadata **m);
233 /* packet functions */
237 * Allocate and read the payload of a packet and initialize its
238 * fields with default values.
241 * @param size desired payload size
242 * @return >0 (read size) if OK, AVERROR_xxx otherwise
244 int av_get_packet(ByteIOContext *s, AVPacket *pkt, int size);
247 /*************************************************/
248 /* fractional numbers for exact pts handling */
251 * The exact value of the fractional number is: 'val + num / den'.
252 * num is assumed to be 0 <= num < den.
254 typedef struct AVFrac {
255 int64_t val, num, den;
258 /*************************************************/
259 /* input/output formats */
264 * This structure contains the data a format has to probe a file.
266 typedef struct AVProbeData {
267 const char *filename;
268 unsigned char *buf; /**< Buffer must have AVPROBE_PADDING_SIZE of extra allocated bytes filled with zero. */
269 int buf_size; /**< Size of buf except extra allocated bytes */
272 #define AVPROBE_SCORE_MAX 100 ///< maximum score, half of that is used for file-extension-based detection
273 #define AVPROBE_PADDING_SIZE 32 ///< extra allocated bytes at the end of the probe buffer
275 typedef struct AVFormatParameters {
276 AVRational time_base;
281 enum PixelFormat pix_fmt;
282 int channel; /**< Used to select DV channel. */
283 const char *standard; /**< TV standard, NTSC, PAL, SECAM */
284 unsigned int mpeg2ts_raw:1; /**< Force raw MPEG-2 transport stream output, if possible. */
285 unsigned int mpeg2ts_compute_pcr:1; /**< Compute exact PCR for each transport
286 stream packet (only meaningful if
287 mpeg2ts_raw is TRUE). */
288 unsigned int initial_pause:1; /**< Do not begin to play the stream
289 immediately (RTSP only). */
290 unsigned int prealloced_context:1;
291 #if FF_API_PARAMETERS_CODEC_ID
292 attribute_deprecated enum CodecID video_codec_id;
293 attribute_deprecated enum CodecID audio_codec_id;
295 } AVFormatParameters;
297 //! Demuxer will use url_fopen, no opened file should be provided by the caller.
298 #define AVFMT_NOFILE 0x0001
299 #define AVFMT_NEEDNUMBER 0x0002 /**< Needs '%d' in filename. */
300 #define AVFMT_SHOW_IDS 0x0008 /**< Show format stream IDs numbers. */
301 #define AVFMT_RAWPICTURE 0x0020 /**< Format wants AVPicture structure for
303 #define AVFMT_GLOBALHEADER 0x0040 /**< Format wants global header. */
304 #define AVFMT_NOTIMESTAMPS 0x0080 /**< Format does not need / have any timestamps. */
305 #define AVFMT_GENERIC_INDEX 0x0100 /**< Use generic index building code. */
306 #define AVFMT_TS_DISCONT 0x0200 /**< Format allows timestamp discontinuities. */
307 #define AVFMT_VARIABLE_FPS 0x0400 /**< Format allows variable fps. */
308 #define AVFMT_NODIMENSIONS 0x0800 /**< Format does not need width/height */
310 typedef struct AVOutputFormat {
313 * Descriptive name for the format, meant to be more human-readable
314 * than name. You should use the NULL_IF_CONFIG_SMALL() macro
317 const char *long_name;
318 const char *mime_type;
319 const char *extensions; /**< comma-separated filename extensions */
321 * size of private data so that it can be allocated in the wrapper
325 enum CodecID audio_codec; /**< default audio codec */
326 enum CodecID video_codec; /**< default video codec */
327 int (*write_header)(struct AVFormatContext *);
328 int (*write_packet)(struct AVFormatContext *, AVPacket *pkt);
329 int (*write_trailer)(struct AVFormatContext *);
331 * can use flags: AVFMT_NOFILE, AVFMT_NEEDNUMBER, AVFMT_GLOBALHEADER
335 * Currently only used to set pixel format if not YUV420P.
337 int (*set_parameters)(struct AVFormatContext *, AVFormatParameters *);
338 int (*interleave_packet)(struct AVFormatContext *, AVPacket *out,
339 AVPacket *in, int flush);
342 * List of supported codec_id-codec_tag pairs, ordered by "better
343 * choice first". The arrays are all terminated by CODEC_ID_NONE.
345 const struct AVCodecTag * const *codec_tag;
347 enum CodecID subtitle_codec; /**< default subtitle codec */
349 const AVMetadataConv *metadata_conv;
352 struct AVOutputFormat *next;
355 typedef struct AVInputFormat {
357 * A comma separated list of short names for the format. New names
358 * may be appended with a minor bump.
363 * Descriptive name for the format, meant to be more human-readable
364 * than name. You should use the NULL_IF_CONFIG_SMALL() macro
367 const char *long_name;
370 * Size of private data so that it can be allocated in the wrapper.
375 * Tell if a given file has a chance of being parsed as this format.
376 * The buffer provided is guaranteed to be AVPROBE_PADDING_SIZE bytes
377 * big so you do not have to check for that unless you need more.
379 int (*read_probe)(AVProbeData *);
382 * Read the format header and initialize the AVFormatContext
383 * structure. Return 0 if OK. 'ap' if non-NULL contains
384 * additional parameters. Only used in raw format right
385 * now. 'av_new_stream' should be called to create new streams.
387 int (*read_header)(struct AVFormatContext *,
388 AVFormatParameters *ap);
391 * Read one packet and put it in 'pkt'. pts and flags are also
392 * set. 'av_new_stream' can be called only if the flag
393 * AVFMTCTX_NOHEADER is used and only in the calling thread (not in a
394 * background thread).
395 * @return 0 on success, < 0 on error.
396 * When returning an error, pkt must not have been allocated
397 * or must be freed before returning
399 int (*read_packet)(struct AVFormatContext *, AVPacket *pkt);
402 * Close the stream. The AVFormatContext and AVStreams are not
403 * freed by this function
405 int (*read_close)(struct AVFormatContext *);
409 * Seek to a given timestamp relative to the frames in
410 * stream component stream_index.
411 * @param stream_index Must not be -1.
412 * @param flags Selects which direction should be preferred if no exact
413 * match is available.
414 * @return >= 0 on success (but not necessarily the new offset)
416 attribute_deprecated int (*read_seek)(struct AVFormatContext *,
417 int stream_index, int64_t timestamp, int flags);
420 * Gets the next timestamp in stream[stream_index].time_base units.
421 * @return the timestamp or AV_NOPTS_VALUE if an error occurred
423 int64_t (*read_timestamp)(struct AVFormatContext *s, int stream_index,
424 int64_t *pos, int64_t pos_limit);
427 * Can use flags: AVFMT_NOFILE, AVFMT_NEEDNUMBER.
432 * If extensions are defined, then no probe is done. You should
433 * usually not use extension format guessing because it is not
436 const char *extensions;
439 * General purpose read-only value that the format can use.
444 * Start/resume playing - only meaningful if using a network-based format
447 int (*read_play)(struct AVFormatContext *);
450 * Pause playing - only meaningful if using a network-based format
453 int (*read_pause)(struct AVFormatContext *);
455 const struct AVCodecTag * const *codec_tag;
458 * Seek to timestamp ts.
459 * Seeking will be done so that the point from which all active streams
460 * can be presented successfully will be closest to ts and within min/max_ts.
461 * Active streams are all streams that have AVStream.discard < AVDISCARD_ALL.
463 int (*read_seek2)(struct AVFormatContext *s, int stream_index, int64_t min_ts, int64_t ts, int64_t max_ts, int flags);
465 const AVMetadataConv *metadata_conv;
468 struct AVInputFormat *next;
471 enum AVStreamParseType {
473 AVSTREAM_PARSE_FULL, /**< full parsing and repack */
474 AVSTREAM_PARSE_HEADERS, /**< Only parse headers, do not repack. */
475 AVSTREAM_PARSE_TIMESTAMPS, /**< full parsing and interpolation of timestamps for frames not starting on a packet boundary */
476 AVSTREAM_PARSE_FULL_ONCE, /**< full parsing and repack of the first frame only, only implemented for H.264 currently */
479 typedef struct AVIndexEntry {
482 #define AVINDEX_KEYFRAME 0x0001
484 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).
485 int min_distance; /**< Minimum distance between this and the previous keyframe, used to avoid unneeded searching. */
488 #define AV_DISPOSITION_DEFAULT 0x0001
489 #define AV_DISPOSITION_DUB 0x0002
490 #define AV_DISPOSITION_ORIGINAL 0x0004
491 #define AV_DISPOSITION_COMMENT 0x0008
492 #define AV_DISPOSITION_LYRICS 0x0010
493 #define AV_DISPOSITION_KARAOKE 0x0020
496 * Track should be used during playback by default.
497 * Useful for subtitle track that should be displayed
498 * even when user did not explicitly ask for subtitles.
500 #define AV_DISPOSITION_FORCED 0x0040
504 * New fields can be added to the end with minor version bumps.
505 * Removal, reordering and changes to existing fields require a major
507 * sizeof(AVStream) must not be used outside libav*.
509 typedef struct AVStream {
510 int index; /**< stream index in AVFormatContext */
511 int id; /**< format-specific stream ID */
512 AVCodecContext *codec; /**< codec context */
514 * Real base framerate of the stream.
515 * This is the lowest framerate with which all timestamps can be
516 * represented accurately (it is the least common multiple of all
517 * framerates in the stream). Note, this value is just a guess!
518 * For example, if the time base is 1/90000 and all frames have either
519 * approximately 3600 or 1800 timer ticks, then r_frame_rate will be 50/1.
521 AVRational r_frame_rate;
524 /* internal data used in av_find_stream_info() */
528 * encoding: pts generation when outputting stream
533 * This is the fundamental unit of time (in seconds) in terms
534 * of which frame timestamps are represented. For fixed-fps content,
535 * time base should be 1/framerate and timestamp increments should be 1.
537 AVRational time_base;
538 int pts_wrap_bits; /**< number of bits in pts (used for wrapping control) */
539 /* ffmpeg.c private use */
540 int stream_copy; /**< If set, just copy stream. */
541 enum AVDiscard discard; ///< Selects which packets can be discarded at will and do not need to be demuxed.
543 //FIXME move stuff to a flags field?
545 * Quality, as it has been removed from AVCodecContext and put in AVVideoFrame.
546 * MN: dunno if that is the right place for it
551 * Decoding: pts of the first frame of the stream, in stream time base.
552 * Only set this if you are absolutely 100% sure that the value you set
553 * it to really is the pts of the first frame.
554 * This may be undefined (AV_NOPTS_VALUE).
555 * @note The ASF header does NOT contain a correct start_time the ASF
556 * demuxer must NOT set this.
561 * Decoding: duration of the stream, in stream time base.
562 * If a source file does not specify a duration, but does specify
563 * a bitrate, this value will be estimated from bitrate and file size.
567 #if FF_API_OLD_METADATA
568 attribute_deprecated char language[4]; /**< ISO 639-2/B 3-letter language code (empty string if undefined) */
571 /* av_read_frame() support */
572 enum AVStreamParseType need_parsing;
573 struct AVCodecParserContext *parser;
576 int last_IP_duration;
578 /* av_seek_frame() support */
579 AVIndexEntry *index_entries; /**< Only used if the format does not
580 support seeking natively. */
581 int nb_index_entries;
582 unsigned int index_entries_allocated_size;
584 int64_t nb_frames; ///< number of frames in this stream if known or 0
586 #if FF_API_LAVF_UNUSED
587 attribute_deprecated int64_t unused[4+1];
590 #if FF_API_OLD_METADATA
591 attribute_deprecated char *filename; /**< source filename of the stream */
594 int disposition; /**< AV_DISPOSITION_* bit field */
596 AVProbeData probe_data;
597 #define MAX_REORDER_DELAY 16
598 int64_t pts_buffer[MAX_REORDER_DELAY+1];
601 * sample aspect ratio (0 if unknown)
602 * - encoding: Set by user.
603 * - decoding: Set by libavformat.
605 AVRational sample_aspect_ratio;
607 AVMetadata *metadata;
609 /* Intended mostly for av_read_frame() support. Not supposed to be used by */
610 /* external applications; try to use something else if at all possible. */
611 const uint8_t *cur_ptr;
615 // Timestamp generation support:
617 * Timestamp corresponding to the last dts sync point.
619 * Initialized when AVCodecParserContext.dts_sync_point >= 0 and
620 * a DTS is received from the underlying container. Otherwise set to
621 * AV_NOPTS_VALUE by default.
623 int64_t reference_dts;
626 * Number of packets to buffer for codec probing
627 * NOT PART OF PUBLIC API
629 #define MAX_PROBE_PACKETS 2500
633 * last packet in packet_buffer for this stream when muxing.
634 * used internally, NOT PART OF PUBLIC API, dont read or write from outside of libav*
636 struct AVPacketList *last_in_packet_buffer;
641 AVRational avg_frame_rate;
644 * Number of frames that have been demuxed during av_find_stream_info()
646 int codec_info_nb_frames;
649 * Stream informations used internally by av_find_stream_info()
651 #define MAX_STD_TIMEBASES (60*12+5)
654 int64_t duration_gcd;
656 double duration_error[MAX_STD_TIMEBASES];
657 int64_t codec_info_duration;
661 #define AV_PROGRAM_RUNNING 1
664 * New fields can be added to the end with minor version bumps.
665 * Removal, reordering and changes to existing fields require a major
667 * sizeof(AVProgram) must not be used outside libav*.
669 typedef struct AVProgram {
671 #if FF_API_OLD_METADATA
672 attribute_deprecated char *provider_name; ///< network name for DVB streams
673 attribute_deprecated char *name; ///< service name for DVB streams
676 enum AVDiscard discard; ///< selects which program to discard and which to feed to the caller
677 unsigned int *stream_index;
678 unsigned int nb_stream_indexes;
679 AVMetadata *metadata;
682 #define AVFMTCTX_NOHEADER 0x0001 /**< signal that no header is present
683 (streams are added dynamically) */
685 typedef struct AVChapter {
686 int id; ///< unique ID to identify the chapter
687 AVRational time_base; ///< time base in which the start/end timestamps are specified
688 int64_t start, end; ///< chapter start/end time in time_base units
689 #if FF_API_OLD_METADATA
690 attribute_deprecated char *title; ///< chapter title
692 AVMetadata *metadata;
695 #if FF_API_MAX_STREAMS
696 #define MAX_STREAMS 20
700 * Format I/O context.
701 * New fields can be added to the end with minor version bumps.
702 * Removal, reordering and changes to existing fields require a major
704 * sizeof(AVFormatContext) must not be used outside libav*.
706 typedef struct AVFormatContext {
707 const AVClass *av_class; /**< Set by avformat_alloc_context. */
708 /* Can only be iformat or oformat, not both at the same time. */
709 struct AVInputFormat *iformat;
710 struct AVOutputFormat *oformat;
713 unsigned int nb_streams;
714 #if FF_API_MAX_STREAMS
715 AVStream *streams[MAX_STREAMS];
719 char filename[1024]; /**< input or output filename */
722 #if FF_API_OLD_METADATA
723 attribute_deprecated char title[512];
724 attribute_deprecated char author[512];
725 attribute_deprecated char copyright[512];
726 attribute_deprecated char comment[512];
727 attribute_deprecated char album[512];
728 attribute_deprecated int year; /**< ID3 year, 0 if none */
729 attribute_deprecated int track; /**< track number, 0 if none */
730 attribute_deprecated char genre[32]; /**< ID3 genre */
733 int ctx_flags; /**< Format-specific flags, see AVFMTCTX_xx */
734 /* private data for pts handling (do not modify directly). */
736 * This buffer is only needed when packets were already buffered but
737 * not decoded, for example to get the codec parameters in MPEG
740 struct AVPacketList *packet_buffer;
743 * Decoding: position of the first frame of the component, in
744 * AV_TIME_BASE fractional seconds. NEVER set this value directly:
745 * It is deduced from the AVStream values.
750 * Decoding: duration of the stream, in AV_TIME_BASE fractional
751 * seconds. Only set this value if you know none of the individual stream
752 * durations and also dont set any of them. This is deduced from the
753 * AVStream values if not set.
758 * decoding: total file size, 0 if unknown
763 * Decoding: total stream bitrate in bit/s, 0 if not
764 * available. Never set it directly if the file_size and the
765 * duration are known as FFmpeg can compute it automatically.
769 /* av_read_frame() support */
771 #if FF_API_LAVF_UNUSED
772 const uint8_t *cur_ptr_deprecated;
773 int cur_len_deprecated;
774 AVPacket cur_pkt_deprecated;
777 /* av_seek_frame() support */
778 int64_t data_offset; /**< offset of the first packet */
782 unsigned int packet_size;
786 #define AVFMT_NOOUTPUTLOOP -1
787 #define AVFMT_INFINITEOUTPUTLOOP 0
789 * number of times to loop output in formats that support it
794 #define AVFMT_FLAG_GENPTS 0x0001 ///< Generate missing pts even if it requires parsing future frames.
795 #define AVFMT_FLAG_IGNIDX 0x0002 ///< Ignore index.
796 #define AVFMT_FLAG_NONBLOCK 0x0004 ///< Do not block when reading packets from input.
797 #define AVFMT_FLAG_IGNDTS 0x0008 ///< Ignore DTS on frames that contain both DTS & PTS
798 #define AVFMT_FLAG_NOFILLIN 0x0010 ///< Do not infer any values from other values, just return what is stored in the container
799 #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
800 #define AVFMT_FLAG_RTP_HINT 0x0040 ///< Add RTP hinting to the output file
805 * decoding: size of data to probe; encoding: unused.
807 unsigned int probesize;
810 * Maximum time (in AV_TIME_BASE units) during which the input should
811 * be analyzed in av_find_stream_info().
813 int max_analyze_duration;
818 unsigned int nb_programs;
819 AVProgram **programs;
822 * Forced video codec_id.
823 * Demuxing: Set by user.
825 enum CodecID video_codec_id;
828 * Forced audio codec_id.
829 * Demuxing: Set by user.
831 enum CodecID audio_codec_id;
834 * Forced subtitle codec_id.
835 * Demuxing: Set by user.
837 enum CodecID subtitle_codec_id;
840 * Maximum amount of memory in bytes to use for the index of each stream.
841 * If the index exceeds this size, entries will be discarded as
842 * needed to maintain a smaller size. This can lead to slower or less
843 * accurate seeking (depends on demuxer).
844 * Demuxers for which a full in-memory index is mandatory will ignore
847 * demuxing: set by user
849 unsigned int max_index_size;
852 * Maximum amount of memory in bytes to use for buffering frames
853 * obtained from realtime capture devices.
855 unsigned int max_picture_buffer;
857 unsigned int nb_chapters;
858 AVChapter **chapters;
861 * Flags to enable debugging.
864 #define FF_FDEBUG_TS 0x0001
867 * Raw packets from the demuxer, prior to parsing and decoding.
868 * This buffer is used for buffering packets until the codec can
869 * be identified, as parsing cannot be done without knowing the
872 struct AVPacketList *raw_packet_buffer;
873 struct AVPacketList *raw_packet_buffer_end;
875 struct AVPacketList *packet_buffer_end;
877 AVMetadata *metadata;
880 * Remaining size available for raw_packet_buffer, in bytes.
881 * NOT PART OF PUBLIC API
883 #define RAW_PACKET_BUFFER_SIZE 2500000
884 int raw_packet_buffer_remaining_size;
887 * Start time of the stream in real world time, in microseconds
888 * since the unix epoch (00:00 1st January 1970). That is, pts=0
889 * in the stream was captured at this real world time.
890 * - encoding: Set by user.
891 * - decoding: Unused.
893 int64_t start_time_realtime;
896 typedef struct AVPacketList {
898 struct AVPacketList *next;
901 #if FF_API_FIRST_FORMAT
902 attribute_deprecated extern AVInputFormat *first_iformat;
903 attribute_deprecated extern AVOutputFormat *first_oformat;
907 * If f is NULL, returns the first registered input format,
908 * if f is non-NULL, returns the next registered input format after f
909 * or NULL if f is the last one.
911 AVInputFormat *av_iformat_next(AVInputFormat *f);
914 * If f is NULL, returns the first registered output format,
915 * if f is non-NULL, returns the next registered output format after f
916 * or NULL if f is the last one.
918 AVOutputFormat *av_oformat_next(AVOutputFormat *f);
920 enum CodecID av_guess_image2_codec(const char *filename);
922 /* XXX: Use automatic init with either ELF sections or C file parser */
926 void av_register_input_format(AVInputFormat *format);
927 void av_register_output_format(AVOutputFormat *format);
928 #if FF_API_GUESS_FORMAT
929 attribute_deprecated AVOutputFormat *guess_stream_format(const char *short_name,
930 const char *filename,
931 const char *mime_type);
934 * @deprecated Use av_guess_format() instead.
936 attribute_deprecated AVOutputFormat *guess_format(const char *short_name,
937 const char *filename,
938 const char *mime_type);
942 * Return the output format in the list of registered output formats
943 * which best matches the provided parameters, or return NULL if
946 * @param short_name if non-NULL checks if short_name matches with the
947 * names of the registered formats
948 * @param filename if non-NULL checks if filename terminates with the
949 * extensions of the registered formats
950 * @param mime_type if non-NULL checks if mime_type matches with the
951 * MIME type of the registered formats
953 AVOutputFormat *av_guess_format(const char *short_name,
954 const char *filename,
955 const char *mime_type);
958 * Guess the codec ID based upon muxer and filename.
960 enum CodecID av_guess_codec(AVOutputFormat *fmt, const char *short_name,
961 const char *filename, const char *mime_type,
962 enum AVMediaType type);
965 * Send a nice hexadecimal dump of a buffer to the specified file stream.
967 * @param f The file stream pointer where the dump should be sent to.
969 * @param size buffer size
971 * @see av_hex_dump_log, av_pkt_dump, av_pkt_dump_log
973 void av_hex_dump(FILE *f, uint8_t *buf, int size);
976 * Send a nice hexadecimal dump of a buffer to the log.
978 * @param avcl A pointer to an arbitrary struct of which the first field is a
979 * pointer to an AVClass struct.
980 * @param level The importance level of the message, lower values signifying
983 * @param size buffer size
985 * @see av_hex_dump, av_pkt_dump, av_pkt_dump_log
987 void av_hex_dump_log(void *avcl, int level, uint8_t *buf, int size);
990 * Send a nice dump of a packet to the specified file stream.
992 * @param f The file stream pointer where the dump should be sent to.
993 * @param pkt packet to dump
994 * @param dump_payload True if the payload must be displayed, too.
996 void av_pkt_dump(FILE *f, AVPacket *pkt, int dump_payload);
999 * Send a nice dump of a packet to the log.
1001 * @param avcl A pointer to an arbitrary struct of which the first field is a
1002 * pointer to an AVClass struct.
1003 * @param level The importance level of the message, lower values signifying
1004 * higher importance.
1005 * @param pkt packet to dump
1006 * @param dump_payload True if the payload must be displayed, too.
1008 void av_pkt_dump_log(void *avcl, int level, AVPacket *pkt, int dump_payload);
1011 * Initialize libavformat and register all the muxers, demuxers and
1012 * protocols. If you do not call this function, then you can select
1013 * exactly which formats you want to support.
1015 * @see av_register_input_format()
1016 * @see av_register_output_format()
1017 * @see av_register_protocol()
1019 void av_register_all(void);
1022 * Get the CodecID for the given codec tag tag.
1023 * If no codec id is found returns CODEC_ID_NONE.
1025 * @param tags list of supported codec_id-codec_tag pairs, as stored
1026 * in AVInputFormat.codec_tag and AVOutputFormat.codec_tag
1028 enum CodecID av_codec_get_id(const struct AVCodecTag * const *tags, unsigned int tag);
1031 * Get the codec tag for the given codec id id.
1032 * If no codec tag is found returns 0.
1034 * @param tags list of supported codec_id-codec_tag pairs, as stored
1035 * in AVInputFormat.codec_tag and AVOutputFormat.codec_tag
1037 unsigned int av_codec_get_tag(const struct AVCodecTag * const *tags, enum CodecID id);
1039 /* media file input */
1042 * Find AVInputFormat based on the short name of the input format.
1044 AVInputFormat *av_find_input_format(const char *short_name);
1047 * Guess the file format.
1049 * @param is_opened Whether the file is already opened; determines whether
1050 * demuxers with or without AVFMT_NOFILE are probed.
1052 AVInputFormat *av_probe_input_format(AVProbeData *pd, int is_opened);
1055 * Guess the file format.
1057 * @param is_opened Whether the file is already opened; determines whether
1058 * demuxers with or without AVFMT_NOFILE are probed.
1059 * @param score_max A probe score larger that this is required to accept a
1060 * detection, the variable is set to the actual detection
1062 * If the score is <= AVPROBE_SCORE_MAX / 4 it is recommended
1063 * to retry with a larger probe buffer.
1065 AVInputFormat *av_probe_input_format2(AVProbeData *pd, int is_opened, int *score_max);
1068 * Allocate all the structures needed to read an input stream.
1069 * This does not open the needed codecs for decoding the stream[s].
1071 int av_open_input_stream(AVFormatContext **ic_ptr,
1072 ByteIOContext *pb, const char *filename,
1073 AVInputFormat *fmt, AVFormatParameters *ap);
1076 * Open a media file as input. The codecs are not opened. Only the file
1077 * header (if present) is read.
1079 * @param ic_ptr The opened media file handle is put here.
1080 * @param filename filename to open
1081 * @param fmt If non-NULL, force the file format to use.
1082 * @param buf_size optional buffer size (zero if default is OK)
1083 * @param ap Additional parameters needed when opening the file
1084 * (NULL if default).
1085 * @return 0 if OK, AVERROR_xxx otherwise
1087 int av_open_input_file(AVFormatContext **ic_ptr, const char *filename,
1090 AVFormatParameters *ap);
1092 #if FF_API_ALLOC_FORMAT_CONTEXT
1094 * @deprecated Use avformat_alloc_context() instead.
1096 attribute_deprecated AVFormatContext *av_alloc_format_context(void);
1100 * Allocate an AVFormatContext.
1101 * Can be freed with av_free() but do not forget to free everything you
1102 * explicitly allocated as well!
1104 AVFormatContext *avformat_alloc_context(void);
1107 * Read packets of a media file to get stream information. This
1108 * is useful for file formats with no headers such as MPEG. This
1109 * function also computes the real framerate in case of MPEG-2 repeat
1111 * The logical file position is not changed by this function;
1112 * examined packets may be buffered for later processing.
1114 * @param ic media file handle
1115 * @return >=0 if OK, AVERROR_xxx on error
1116 * @todo Let the user decide somehow what information is needed so that
1117 * we do not waste time getting stuff the user does not need.
1119 int av_find_stream_info(AVFormatContext *ic);
1122 * Read a transport packet from a media file.
1124 * This function is obsolete and should never be used.
1125 * Use av_read_frame() instead.
1127 * @param s media file handle
1128 * @param pkt is filled
1129 * @return 0 if OK, AVERROR_xxx on error
1131 int av_read_packet(AVFormatContext *s, AVPacket *pkt);
1134 * Return the next frame of a stream.
1135 * This function returns what is stored in the file, and does not validate
1136 * that what is there are valid frames for the decoder. It will split what is
1137 * stored in the file into frames and return one for each call. It will not
1138 * omit invalid data between valid frames so as to give the decoder the maximum
1139 * information possible for decoding.
1141 * The returned packet is valid
1142 * until the next av_read_frame() or until av_close_input_file() and
1143 * must be freed with av_free_packet. For video, the packet contains
1144 * exactly one frame. For audio, it contains an integer number of
1145 * frames if each frame has a known fixed size (e.g. PCM or ADPCM
1146 * data). If the audio frames have a variable size (e.g. MPEG audio),
1147 * then it contains one frame.
1149 * pkt->pts, pkt->dts and pkt->duration are always set to correct
1150 * values in AVStream.time_base units (and guessed if the format cannot
1151 * provide them). pkt->pts can be AV_NOPTS_VALUE if the video format
1152 * has B-frames, so it is better to rely on pkt->dts if you do not
1153 * decompress the payload.
1155 * @return 0 if OK, < 0 on error or end of file
1157 int av_read_frame(AVFormatContext *s, AVPacket *pkt);
1160 * Seek to the keyframe at timestamp.
1161 * 'timestamp' in 'stream_index'.
1162 * @param stream_index If stream_index is (-1), a default
1163 * stream is selected, and timestamp is automatically converted
1164 * from AV_TIME_BASE units to the stream specific time_base.
1165 * @param timestamp Timestamp in AVStream.time_base units
1166 * or, if no stream is specified, in AV_TIME_BASE units.
1167 * @param flags flags which select direction and seeking mode
1168 * @return >= 0 on success
1170 int av_seek_frame(AVFormatContext *s, int stream_index, int64_t timestamp,
1174 * Seek to timestamp ts.
1175 * Seeking will be done so that the point from which all active streams
1176 * can be presented successfully will be closest to ts and within min/max_ts.
1177 * Active streams are all streams that have AVStream.discard < AVDISCARD_ALL.
1179 * If flags contain AVSEEK_FLAG_BYTE, then all timestamps are in bytes and
1180 * are the file position (this may not be supported by all demuxers).
1181 * If flags contain AVSEEK_FLAG_FRAME, then all timestamps are in frames
1182 * in the stream with stream_index (this may not be supported by all demuxers).
1183 * Otherwise all timestamps are in units of the stream selected by stream_index
1184 * or if stream_index is -1, in AV_TIME_BASE units.
1185 * If flags contain AVSEEK_FLAG_ANY, then non-keyframes are treated as
1186 * keyframes (this may not be supported by all demuxers).
1188 * @param stream_index index of the stream which is used as time base reference
1189 * @param min_ts smallest acceptable timestamp
1190 * @param ts target timestamp
1191 * @param max_ts largest acceptable timestamp
1192 * @param flags flags
1193 * @return >=0 on success, error code otherwise
1195 * @note This is part of the new seek API which is still under construction.
1196 * Thus do not use this yet. It may change at any time, do not expect
1197 * ABI compatibility yet!
1199 int avformat_seek_file(AVFormatContext *s, int stream_index, int64_t min_ts, int64_t ts, int64_t max_ts, int flags);
1202 * Start playing a network-based stream (e.g. RTSP stream) at the
1205 int av_read_play(AVFormatContext *s);
1208 * Pause a network-based stream (e.g. RTSP stream).
1210 * Use av_read_play() to resume it.
1212 int av_read_pause(AVFormatContext *s);
1215 * Free a AVFormatContext allocated by av_open_input_stream.
1216 * @param s context to free
1218 void av_close_input_stream(AVFormatContext *s);
1221 * Close a media file (but not its codecs).
1223 * @param s media file handle
1225 void av_close_input_file(AVFormatContext *s);
1228 * Add a new stream to a media file.
1230 * Can only be called in the read_header() function. If the flag
1231 * AVFMTCTX_NOHEADER is in the format context, then new streams
1232 * can be added in read_packet too.
1234 * @param s media file handle
1235 * @param id file-format-dependent stream ID
1237 AVStream *av_new_stream(AVFormatContext *s, int id);
1238 AVProgram *av_new_program(AVFormatContext *s, int id);
1241 * Add a new chapter.
1242 * This function is NOT part of the public API
1243 * and should ONLY be used by demuxers.
1245 * @param s media file handle
1246 * @param id unique ID for this chapter
1247 * @param start chapter start time in time_base units
1248 * @param end chapter end time in time_base units
1249 * @param title chapter title
1251 * @return AVChapter or NULL on error
1253 AVChapter *ff_new_chapter(AVFormatContext *s, int id, AVRational time_base,
1254 int64_t start, int64_t end, const char *title);
1257 * Set the pts for a given stream.
1260 * @param pts_wrap_bits number of bits effectively used by the pts
1261 * (used for wrap control, 33 is the value for MPEG)
1262 * @param pts_num numerator to convert to seconds (MPEG: 1)
1263 * @param pts_den denominator to convert to seconds (MPEG: 90000)
1265 void av_set_pts_info(AVStream *s, int pts_wrap_bits,
1266 unsigned int pts_num, unsigned int pts_den);
1268 #define AVSEEK_FLAG_BACKWARD 1 ///< seek backward
1269 #define AVSEEK_FLAG_BYTE 2 ///< seeking based on position in bytes
1270 #define AVSEEK_FLAG_ANY 4 ///< seek to any frame, even non-keyframes
1271 #define AVSEEK_FLAG_FRAME 8 ///< seeking based on frame number
1273 int av_find_default_stream_index(AVFormatContext *s);
1276 * Get the index for a specific timestamp.
1277 * @param flags if AVSEEK_FLAG_BACKWARD then the returned index will correspond
1278 * to the timestamp which is <= the requested one, if backward
1279 * is 0, then it will be >=
1280 * if AVSEEK_FLAG_ANY seek to any frame, only keyframes otherwise
1281 * @return < 0 if no such timestamp could be found
1283 int av_index_search_timestamp(AVStream *st, int64_t timestamp, int flags);
1286 * Ensure the index uses less memory than the maximum specified in
1287 * AVFormatContext.max_index_size by discarding entries if it grows
1289 * This function is not part of the public API and should only be called
1292 void ff_reduce_index(AVFormatContext *s, int stream_index);
1295 * Add an index entry into a sorted list. Update the entry if the list
1296 * already contains it.
1298 * @param timestamp timestamp in the time base of the given stream
1300 int av_add_index_entry(AVStream *st, int64_t pos, int64_t timestamp,
1301 int size, int distance, int flags);
1304 * Perform a binary search using av_index_search_timestamp() and
1305 * AVInputFormat.read_timestamp().
1306 * This is not supposed to be called directly by a user application,
1308 * @param target_ts target timestamp in the time base of the given stream
1309 * @param stream_index stream number
1311 int av_seek_frame_binary(AVFormatContext *s, int stream_index,
1312 int64_t target_ts, int flags);
1315 * Update cur_dts of all streams based on the given timestamp and AVStream.
1317 * Stream ref_st unchanged, others set cur_dts in their native time base.
1318 * Only needed for timestamp wrapping or if (dts not set and pts!=dts).
1319 * @param timestamp new dts expressed in time_base of param ref_st
1320 * @param ref_st reference stream giving time_base of param timestamp
1322 void av_update_cur_dts(AVFormatContext *s, AVStream *ref_st, int64_t timestamp);
1325 * Perform a binary search using read_timestamp().
1326 * This is not supposed to be called directly by a user application,
1328 * @param target_ts target timestamp in the time base of the given stream
1329 * @param stream_index stream number
1331 int64_t av_gen_search(AVFormatContext *s, int stream_index,
1332 int64_t target_ts, int64_t pos_min,
1333 int64_t pos_max, int64_t pos_limit,
1334 int64_t ts_min, int64_t ts_max,
1335 int flags, int64_t *ts_ret,
1336 int64_t (*read_timestamp)(struct AVFormatContext *, int , int64_t *, int64_t ));
1341 int av_set_parameters(AVFormatContext *s, AVFormatParameters *ap);
1344 * Split a URL string into components.
1346 * The pointers to buffers for storing individual components may be null,
1347 * in order to ignore that component. Buffers for components not found are
1348 * set to empty strings. If the port is not found, it is set to a negative
1351 * @param proto the buffer for the protocol
1352 * @param proto_size the size of the proto buffer
1353 * @param authorization the buffer for the authorization
1354 * @param authorization_size the size of the authorization buffer
1355 * @param hostname the buffer for the host name
1356 * @param hostname_size the size of the hostname buffer
1357 * @param port_ptr a pointer to store the port number in
1358 * @param path the buffer for the path
1359 * @param path_size the size of the path buffer
1360 * @param url the URL to split
1362 void av_url_split(char *proto, int proto_size,
1363 char *authorization, int authorization_size,
1364 char *hostname, int hostname_size,
1366 char *path, int path_size,
1370 * Allocate the stream private data and write the stream header to an
1371 * output media file.
1373 * @param s media file handle
1374 * @return 0 if OK, AVERROR_xxx on error
1376 int av_write_header(AVFormatContext *s);
1379 * Write a packet to an output media file.
1381 * The packet shall contain one audio or video frame.
1382 * The packet must be correctly interleaved according to the container
1383 * specification, if not then av_interleaved_write_frame must be used.
1385 * @param s media file handle
1386 * @param pkt The packet, which contains the stream_index, buf/buf_size,
1388 * @return < 0 on error, = 0 if OK, 1 if end of stream wanted
1390 int av_write_frame(AVFormatContext *s, AVPacket *pkt);
1393 * Write a packet to an output media file ensuring correct interleaving.
1395 * The packet must contain one audio or video frame.
1396 * If the packets are already correctly interleaved, the application should
1397 * call av_write_frame() instead as it is slightly faster. It is also important
1398 * to keep in mind that completely non-interleaved input will need huge amounts
1399 * of memory to interleave with this, so it is preferable to interleave at the
1402 * @param s media file handle
1403 * @param pkt The packet, which contains the stream_index, buf/buf_size,
1405 * @return < 0 on error, = 0 if OK, 1 if end of stream wanted
1407 int av_interleaved_write_frame(AVFormatContext *s, AVPacket *pkt);
1410 * Interleave a packet per dts in an output media file.
1412 * Packets with pkt->destruct == av_destruct_packet will be freed inside this
1413 * function, so they cannot be used after it. Note that calling av_free_packet()
1414 * on them is still safe.
1416 * @param s media file handle
1417 * @param out the interleaved packet will be output here
1418 * @param pkt the input packet
1419 * @param flush 1 if no further packets are available as input and all
1420 * remaining packets should be output
1421 * @return 1 if a packet was output, 0 if no packet could be output,
1422 * < 0 if an error occurred
1424 int av_interleave_packet_per_dts(AVFormatContext *s, AVPacket *out,
1425 AVPacket *pkt, int flush);
1428 * Write the stream trailer to an output media file and free the
1429 * file private data.
1431 * May only be called after a successful call to av_write_header.
1433 * @param s media file handle
1434 * @return 0 if OK, AVERROR_xxx on error
1436 int av_write_trailer(AVFormatContext *s);
1438 void dump_format(AVFormatContext *ic,
1443 #if FF_API_PARSE_FRAME_PARAM
1445 * Parse width and height out of string str.
1446 * @deprecated Use av_parse_video_frame_size instead.
1448 attribute_deprecated int parse_image_size(int *width_ptr, int *height_ptr,
1452 * Convert framerate from a string to a fraction.
1453 * @deprecated Use av_parse_video_frame_rate instead.
1455 attribute_deprecated int parse_frame_rate(int *frame_rate, int *frame_rate_base,
1460 * Parse datestr and return a corresponding number of microseconds.
1461 * @param datestr String representing a date or a duration.
1462 * - If a date the syntax is:
1464 * now|{[{YYYY-MM-DD|YYYYMMDD}[T|t| ]]{{HH[:MM[:SS[.m...]]]}|{HH[MM[SS[.m...]]]}}[Z|z]}
1466 * If the value is "now" it takes the current time.
1467 * Time is local time unless Z is appended, in which case it is
1468 * interpreted as UTC.
1469 * If the year-month-day part is not specified it takes the current
1471 * @return the number of microseconds since 1st of January, 1970 up to
1472 * the time of the parsed date or INT64_MIN if datestr cannot be
1473 * successfully parsed.
1474 * - If a duration the syntax is:
1476 * [-]HH[:MM[:SS[.m...]]]
1479 * @return the number of microseconds contained in a time interval
1480 * with the specified duration or INT64_MIN if datestr cannot be
1481 * successfully parsed.
1482 * @param duration Flag which tells how to interpret datestr, if
1483 * not zero datestr is interpreted as a duration, otherwise as a
1486 int64_t parse_date(const char *datestr, int duration);
1489 * Get the current time in microseconds.
1491 int64_t av_gettime(void);
1493 /* ffm-specific for ffserver */
1494 #define FFM_PACKET_SIZE 4096
1495 int64_t ffm_read_write_index(int fd);
1496 int ffm_write_write_index(int fd, int64_t pos);
1497 void ffm_set_write_index(AVFormatContext *s, int64_t pos, int64_t file_size);
1500 * Attempt to find a specific tag in a URL.
1502 * syntax: '?tag1=val1&tag2=val2...'. Little URL decoding is done.
1503 * Return 1 if found.
1505 int find_info_tag(char *arg, int arg_size, const char *tag1, const char *info);
1508 * Return in 'buf' the path with '%d' replaced by a number.
1510 * Also handles the '%0nd' format where 'n' is the total number
1511 * of digits and '%%'.
1513 * @param buf destination buffer
1514 * @param buf_size destination buffer size
1515 * @param path numbered sequence string
1516 * @param number frame number
1517 * @return 0 if OK, -1 on format error
1519 int av_get_frame_filename(char *buf, int buf_size,
1520 const char *path, int number);
1523 * Check whether filename actually is a numbered sequence generator.
1525 * @param filename possible numbered sequence string
1526 * @return 1 if a valid numbered sequence string, 0 otherwise
1528 int av_filename_number_test(const char *filename);
1531 * Generate an SDP for an RTP session.
1533 * @param ac array of AVFormatContexts describing the RTP streams. If the
1534 * array is composed by only one context, such context can contain
1535 * multiple AVStreams (one AVStream per RTP stream). Otherwise,
1536 * all the contexts in the array (an AVCodecContext per RTP stream)
1537 * must contain only one AVStream.
1538 * @param n_files number of AVCodecContexts contained in ac
1539 * @param buff buffer where the SDP will be stored (must be allocated by
1541 * @param size the size of the buffer
1542 * @return 0 if OK, AVERROR_xxx on error
1544 int avf_sdp_create(AVFormatContext *ac[], int n_files, char *buff, int size);
1547 * Return a positive value if the given filename has one of the given
1548 * extensions, 0 otherwise.
1550 * @param extensions a comma-separated list of filename extensions
1552 int av_match_ext(const char *filename, const char *extensions);
1554 #endif /* AVFORMAT_AVFORMAT_H */