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 78
26 #define LIBAVFORMAT_VERSION_MICRO 1
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 * I return the LIBAVFORMAT_VERSION_INT constant. You got
40 * a fucking problem with that, douchebag?
42 unsigned avformat_version(void);
45 * Return the libavformat build-time configuration.
47 const char *avformat_configuration(void);
50 * Return the libavformat license.
52 const char *avformat_license(void);
55 #include <stdio.h> /* FILE */
56 #include "libavcodec/avcodec.h"
60 struct AVFormatContext;
64 * Public Metadata API.
65 * The metadata API allows libavformat to export metadata tags to a client
66 * application using a sequence of key/value pairs. Like all strings in FFmpeg,
67 * metadata must be stored as UTF-8 encoded Unicode. Note that metadata
68 * exported by demuxers isn't checked to be valid UTF-8 in most cases.
69 * Important concepts to keep in mind:
70 * 1. Keys are unique; there can never be 2 tags with the same key. This is
71 * also meant semantically, i.e., a demuxer should not knowingly produce
72 * several keys that are literally different but semantically identical.
73 * E.g., key=Author5, key=Author6. In this example, all authors must be
74 * placed in the same tag.
75 * 2. Metadata is flat, not hierarchical; there are no subtags. If you
76 * want to store, e.g., the email address of the child of producer Alice
77 * and actor Bob, that could have key=alice_and_bobs_childs_email_address.
78 * 3. Several modifiers can be applied to the tag name. This is done by
79 * appending a dash character ('-') and the modifier name in the order
80 * they appear in the list below -- e.g. foo-eng-sort, not foo-sort-eng.
81 * a) language -- a tag whose value is localized for a particular language
82 * is appended with the ISO 639-2/B 3-letter language code.
83 * For example: Author-ger=Michael, Author-eng=Mike
84 * The original/default language is in the unqualified "Author" tag.
85 * A demuxer should set a default if it sets any translated tag.
86 * b) sorting -- a modified version of a tag that should be used for
87 * sorting will have '-sort' appended. E.g. artist="The Beatles",
88 * artist-sort="Beatles, The".
90 * 4. Tag names are normally exported exactly as stored in the container to
91 * allow lossless remuxing to the same format. For container-independent
92 * handling of metadata, av_metadata_conv() can convert it to ffmpeg generic
93 * format. Follows a list of generic tag names:
95 * album -- name of the set this work belongs to
96 * album_artist -- main creator of the set/album, if different from artist.
97 * e.g. "Various Artists" for compilation albums.
98 * artist -- main creator of the work
99 * comment -- any additional description of the file.
100 * composer -- who composed the work, if different from artist.
101 * copyright -- name of copyright holder.
102 * date -- date when the work was created, preferably in ISO 8601.
103 * disc -- number of a subset, e.g. disc in a multi-disc collection.
104 * encoder -- name/settings of the software/hardware that produced the file.
105 * encoded_by -- person/group who created the file.
106 * filename -- original name of the file.
107 * genre -- <self-evident>.
108 * language -- main language in which the work is performed, preferably
109 * in ISO 639-2 format.
110 * performer -- artist who performed the work, if different from artist.
111 * E.g for "Also sprach Zarathustra", artist would be "Richard
112 * Strauss" and performer "London Philharmonic Orchestra".
113 * publisher -- name of the label/publisher.
114 * title -- name of the work.
115 * track -- number of this work in the set, can be in form current/total.
118 #define AV_METADATA_MATCH_CASE 1
119 #define AV_METADATA_IGNORE_SUFFIX 2
120 #define AV_METADATA_DONT_STRDUP_KEY 4
121 #define AV_METADATA_DONT_STRDUP_VAL 8
122 #define AV_METADATA_DONT_OVERWRITE 16 ///< Don't overwrite existing tags.
129 typedef struct AVMetadata AVMetadata;
130 typedef struct AVMetadataConv AVMetadataConv;
133 * Get a metadata element with matching key.
135 * @param prev Set to the previous matching element to find the next.
136 * If set to NULL the first matching element is returned.
137 * @param flags Allows case as well as suffix-insensitive comparisons.
138 * @return Found tag or NULL, changing key or value leads to undefined behavior.
141 av_metadata_get(AVMetadata *m, const char *key, const AVMetadataTag *prev, int flags);
143 #if LIBAVFORMAT_VERSION_MAJOR == 52
145 * Set the given tag in *pm, overwriting an existing tag.
147 * @param pm pointer to a pointer to a metadata struct. If *pm is NULL
148 * a metadata struct is allocated and put in *pm.
149 * @param key tag key to add to *pm (will be av_strduped)
150 * @param value tag value to add to *pm (will be av_strduped)
151 * @return >= 0 on success otherwise an error code <0
152 * @deprecated Use av_metadata_set2() instead.
154 attribute_deprecated int av_metadata_set(AVMetadata **pm, const char *key, const char *value);
158 * Set the given tag in *pm, overwriting an existing tag.
160 * @param pm pointer to a pointer to a metadata struct. If *pm is NULL
161 * a metadata struct is allocated and put in *pm.
162 * @param key tag key to add to *pm (will be av_strduped depending on flags)
163 * @param value tag value to add to *pm (will be av_strduped depending on flags).
164 * Passing a NULL value will cause an existing tag to be deleted.
165 * @return >= 0 on success otherwise an error code <0
167 int av_metadata_set2(AVMetadata **pm, const char *key, const char *value, int flags);
170 * Convert all the metadata sets from ctx according to the source and
171 * destination conversion tables. If one of the tables is NULL, then
172 * tags are converted to/from ffmpeg generic tag names.
174 * @param d_conv destination tags format conversion table
175 * @param s_conv source tags format conversion table
177 void av_metadata_conv(struct AVFormatContext *ctx, const AVMetadataConv *d_conv,
178 const AVMetadataConv *s_conv);
181 * Free all the memory allocated for an AVMetadata struct.
183 void av_metadata_free(AVMetadata **m);
186 /* packet functions */
190 * Allocate and read the payload of a packet and initialize its
191 * fields with default values.
194 * @param size desired payload size
195 * @return >0 (read size) if OK, AVERROR_xxx otherwise
197 int av_get_packet(ByteIOContext *s, AVPacket *pkt, int size);
200 /*************************************************/
201 /* fractional numbers for exact pts handling */
204 * The exact value of the fractional number is: 'val + num / den'.
205 * num is assumed to be 0 <= num < den.
207 typedef struct AVFrac {
208 int64_t val, num, den;
211 /*************************************************/
212 /* input/output formats */
217 * This structure contains the data a format has to probe a file.
219 typedef struct AVProbeData {
220 const char *filename;
221 unsigned char *buf; /**< Buffer must have AVPROBE_PADDING_SIZE of extra allocated bytes filled with zero. */
222 int buf_size; /**< Size of buf except extra allocated bytes */
225 #define AVPROBE_SCORE_MAX 100 ///< maximum score, half of that is used for file-extension-based detection
226 #define AVPROBE_PADDING_SIZE 32 ///< extra allocated bytes at the end of the probe buffer
228 typedef struct AVFormatParameters {
229 AVRational time_base;
234 enum PixelFormat pix_fmt;
235 int channel; /**< Used to select DV channel. */
236 const char *standard; /**< TV standard, NTSC, PAL, SECAM */
237 unsigned int mpeg2ts_raw:1; /**< Force raw MPEG-2 transport stream output, if possible. */
238 unsigned int mpeg2ts_compute_pcr:1; /**< Compute exact PCR for each transport
239 stream packet (only meaningful if
240 mpeg2ts_raw is TRUE). */
241 unsigned int initial_pause:1; /**< Do not begin to play the stream
242 immediately (RTSP only). */
243 unsigned int prealloced_context:1;
244 #if LIBAVFORMAT_VERSION_INT < (53<<16)
245 enum CodecID video_codec_id;
246 enum CodecID audio_codec_id;
248 } AVFormatParameters;
250 //! Demuxer will use url_fopen, 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. */
260 #define AVFMT_VARIABLE_FPS 0x0400 /**< Format allows variable fps. */
261 #define AVFMT_NODIMENSIONS 0x0800 /**< Format does not need width/height */
263 typedef struct AVOutputFormat {
266 * Descriptive name for the format, meant to be more human-readable
267 * than name. You should use the NULL_IF_CONFIG_SMALL() macro
270 const char *long_name;
271 const char *mime_type;
272 const char *extensions; /**< comma-separated filename extensions */
274 * size of private data so that it can be allocated in the wrapper
278 enum CodecID audio_codec; /**< default audio codec */
279 enum CodecID video_codec; /**< default video codec */
280 int (*write_header)(struct AVFormatContext *);
281 int (*write_packet)(struct AVFormatContext *, AVPacket *pkt);
282 int (*write_trailer)(struct AVFormatContext *);
284 * can use flags: AVFMT_NOFILE, AVFMT_NEEDNUMBER, AVFMT_GLOBALHEADER
288 * Currently only used to set pixel format if not YUV420P.
290 int (*set_parameters)(struct AVFormatContext *, AVFormatParameters *);
291 int (*interleave_packet)(struct AVFormatContext *, AVPacket *out,
292 AVPacket *in, int flush);
295 * List of supported codec_id-codec_tag pairs, ordered by "better
296 * choice first". The arrays are all terminated by CODEC_ID_NONE.
298 const struct AVCodecTag * const *codec_tag;
300 enum CodecID subtitle_codec; /**< default subtitle codec */
302 const AVMetadataConv *metadata_conv;
305 struct AVOutputFormat *next;
308 typedef struct AVInputFormat {
310 * A comma separated list of short names for the format. New names
311 * may be appended with a minor bump.
316 * Descriptive name for the format, meant to be more human-readable
317 * than name. You should use the NULL_IF_CONFIG_SMALL() macro
320 const char *long_name;
323 * Size of private data so that it can be allocated in the wrapper.
328 * Tell if a given file has a chance of being parsed as this format.
329 * The buffer provided is guaranteed to be AVPROBE_PADDING_SIZE bytes
330 * big so you do not have to check for that unless you need more.
332 int (*read_probe)(AVProbeData *);
335 * Read the format header and initialize the AVFormatContext
336 * structure. Return 0 if OK. 'ap' if non-NULL contains
337 * additional parameters. Only used in raw format right
338 * now. 'av_new_stream' should be called to create new streams.
340 int (*read_header)(struct AVFormatContext *,
341 AVFormatParameters *ap);
344 * Read one packet and put it in 'pkt'. pts and flags are also
345 * set. 'av_new_stream' can be called only if the flag
346 * AVFMTCTX_NOHEADER is used.
347 * @return 0 on success, < 0 on error.
348 * When returning an error, pkt must not have been allocated
349 * or must be freed before returning
351 int (*read_packet)(struct AVFormatContext *, AVPacket *pkt);
354 * Close the stream. The AVFormatContext and AVStreams are not
355 * freed by this function
357 int (*read_close)(struct AVFormatContext *);
359 #if LIBAVFORMAT_VERSION_MAJOR < 53
361 * Seek to a given timestamp relative to the frames in
362 * stream component stream_index.
363 * @param stream_index Must not be -1.
364 * @param flags Selects which direction should be preferred if no exact
365 * match is available.
366 * @return >= 0 on success (but not necessarily the new offset)
368 int (*read_seek)(struct AVFormatContext *,
369 int stream_index, int64_t timestamp, int flags);
372 * Gets the next timestamp in stream[stream_index].time_base units.
373 * @return the timestamp or AV_NOPTS_VALUE if an error occurred
375 int64_t (*read_timestamp)(struct AVFormatContext *s, int stream_index,
376 int64_t *pos, int64_t pos_limit);
379 * Can use flags: AVFMT_NOFILE, AVFMT_NEEDNUMBER.
384 * If extensions are defined, then no probe is done. You should
385 * usually not use extension format guessing because it is not
388 const char *extensions;
391 * General purpose read-only value that the format can use.
396 * Start/resume playing - only meaningful if using a network-based format
399 int (*read_play)(struct AVFormatContext *);
402 * Pause playing - only meaningful if using a network-based format
405 int (*read_pause)(struct AVFormatContext *);
407 const struct AVCodecTag * const *codec_tag;
410 * Seek to timestamp ts.
411 * Seeking will be done so that the point from which all active streams
412 * can be presented successfully will be closest to ts and within min/max_ts.
413 * Active streams are all streams that have AVStream.discard < AVDISCARD_ALL.
415 int (*read_seek2)(struct AVFormatContext *s, int stream_index, int64_t min_ts, int64_t ts, int64_t max_ts, int flags);
417 const AVMetadataConv *metadata_conv;
420 struct AVInputFormat *next;
423 enum AVStreamParseType {
425 AVSTREAM_PARSE_FULL, /**< full parsing and repack */
426 AVSTREAM_PARSE_HEADERS, /**< Only parse headers, do not repack. */
427 AVSTREAM_PARSE_TIMESTAMPS, /**< full parsing and interpolation of timestamps for frames not starting on a packet boundary */
428 AVSTREAM_PARSE_FULL_ONCE, /**< full parsing and repack of the first frame only, only implemented for H.264 currently */
431 typedef struct AVIndexEntry {
434 #define AVINDEX_KEYFRAME 0x0001
436 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).
437 int min_distance; /**< Minimum distance between this and the previous keyframe, used to avoid unneeded searching. */
440 #define AV_DISPOSITION_DEFAULT 0x0001
441 #define AV_DISPOSITION_DUB 0x0002
442 #define AV_DISPOSITION_ORIGINAL 0x0004
443 #define AV_DISPOSITION_COMMENT 0x0008
444 #define AV_DISPOSITION_LYRICS 0x0010
445 #define AV_DISPOSITION_KARAOKE 0x0020
448 * Track should be used during playback by default.
449 * Useful for subtitle track that should be displayed
450 * even when user did not explicitly ask for subtitles.
452 #define AV_DISPOSITION_FORCED 0x0040
456 * New fields can be added to the end with minor version bumps.
457 * Removal, reordering and changes to existing fields require a major
459 * sizeof(AVStream) must not be used outside libav*.
461 typedef struct AVStream {
462 int index; /**< stream index in AVFormatContext */
463 int id; /**< format-specific stream ID */
464 AVCodecContext *codec; /**< codec context */
466 * Real base framerate of the stream.
467 * This is the lowest framerate with which all timestamps can be
468 * represented accurately (it is the least common multiple of all
469 * framerates in the stream). Note, this value is just a guess!
470 * For example, if the time base is 1/90000 and all frames have either
471 * approximately 3600 or 1800 timer ticks, then r_frame_rate will be 50/1.
473 AVRational r_frame_rate;
476 /* internal data used in av_find_stream_info() */
480 * encoding: pts generation when outputting stream
485 * This is the fundamental unit of time (in seconds) in terms
486 * of which frame timestamps are represented. For fixed-fps content,
487 * time base should be 1/framerate and timestamp increments should be 1.
489 AVRational time_base;
490 int pts_wrap_bits; /**< number of bits in pts (used for wrapping control) */
491 /* ffmpeg.c private use */
492 int stream_copy; /**< If set, just copy stream. */
493 enum AVDiscard discard; ///< Selects which packets can be discarded at will and do not need to be demuxed.
495 //FIXME move stuff to a flags field?
497 * Quality, as it has been removed from AVCodecContext and put in AVVideoFrame.
498 * MN: dunno if that is the right place for it
503 * Decoding: pts of the first frame of the stream, in stream time base.
504 * Only set this if you are absolutely 100% sure that the value you set
505 * it to really is the pts of the first frame.
506 * This may be undefined (AV_NOPTS_VALUE).
507 * @note The ASF header does NOT contain a correct start_time the ASF
508 * demuxer must NOT set this.
513 * Decoding: duration of the stream, in stream time base.
514 * If a source file does not specify a duration, but does specify
515 * a bitrate, this value will be estimated from bitrate and file size.
519 #if LIBAVFORMAT_VERSION_INT < (53<<16)
520 char language[4]; /**< ISO 639-2/B 3-letter language code (empty string if undefined) */
523 /* av_read_frame() support */
524 enum AVStreamParseType need_parsing;
525 struct AVCodecParserContext *parser;
528 int last_IP_duration;
530 /* av_seek_frame() support */
531 AVIndexEntry *index_entries; /**< Only used if the format does not
532 support seeking natively. */
533 int nb_index_entries;
534 unsigned int index_entries_allocated_size;
536 int64_t nb_frames; ///< number of frames in this stream if known or 0
538 #if LIBAVFORMAT_VERSION_INT < (53<<16)
541 char *filename; /**< source filename of the stream */
544 int disposition; /**< AV_DISPOSITION_* bit field */
546 AVProbeData probe_data;
547 #define MAX_REORDER_DELAY 16
548 int64_t pts_buffer[MAX_REORDER_DELAY+1];
551 * sample aspect ratio (0 if unknown)
552 * - encoding: Set by user.
553 * - decoding: Set by libavformat.
555 AVRational sample_aspect_ratio;
557 AVMetadata *metadata;
559 /* Intended mostly for av_read_frame() support. Not supposed to be used by */
560 /* external applications; try to use something else if at all possible. */
561 const uint8_t *cur_ptr;
565 // Timestamp generation support:
567 * Timestamp corresponding to the last dts sync point.
569 * Initialized when AVCodecParserContext.dts_sync_point >= 0 and
570 * a DTS is received from the underlying container. Otherwise set to
571 * AV_NOPTS_VALUE by default.
573 int64_t reference_dts;
576 * Number of packets to buffer for codec probing
577 * NOT PART OF PUBLIC API
579 #define MAX_PROBE_PACKETS 2500
583 * last packet in packet_buffer for this stream when muxing.
584 * used internally, NOT PART OF PUBLIC API, dont read or write from outside of libav*
586 struct AVPacketList *last_in_packet_buffer;
591 AVRational avg_frame_rate;
594 * Number of frames that have been demuxed during av_find_stream_info()
596 int codec_info_nb_frames;
599 #define AV_PROGRAM_RUNNING 1
602 * New fields can be added to the end with minor version bumps.
603 * Removal, reordering and changes to existing fields require a major
605 * sizeof(AVProgram) must not be used outside libav*.
607 typedef struct AVProgram {
609 #if LIBAVFORMAT_VERSION_INT < (53<<16)
610 char *provider_name; ///< network name for DVB streams
611 char *name; ///< service name for DVB streams
614 enum AVDiscard discard; ///< selects which program to discard and which to feed to the caller
615 unsigned int *stream_index;
616 unsigned int nb_stream_indexes;
617 AVMetadata *metadata;
620 #define AVFMTCTX_NOHEADER 0x0001 /**< signal that no header is present
621 (streams are added dynamically) */
623 typedef struct AVChapter {
624 int id; ///< unique ID to identify the chapter
625 AVRational time_base; ///< time base in which the start/end timestamps are specified
626 int64_t start, end; ///< chapter start/end time in time_base units
627 #if LIBAVFORMAT_VERSION_INT < (53<<16)
628 char *title; ///< chapter title
630 AVMetadata *metadata;
633 #if LIBAVFORMAT_VERSION_MAJOR < 53
634 #define MAX_STREAMS 20
638 * Format I/O context.
639 * New fields can be added to the end with minor version bumps.
640 * Removal, reordering and changes to existing fields require a major
642 * sizeof(AVFormatContext) must not be used outside libav*.
644 typedef struct AVFormatContext {
645 const AVClass *av_class; /**< Set by avformat_alloc_context. */
646 /* Can only be iformat or oformat, not both at the same time. */
647 struct AVInputFormat *iformat;
648 struct AVOutputFormat *oformat;
651 unsigned int nb_streams;
652 AVStream *streams[MAX_STREAMS];
653 char filename[1024]; /**< input or output filename */
656 #if LIBAVFORMAT_VERSION_INT < (53<<16)
662 int year; /**< ID3 year, 0 if none */
663 int track; /**< track number, 0 if none */
664 char genre[32]; /**< ID3 genre */
667 int ctx_flags; /**< Format-specific flags, see AVFMTCTX_xx */
668 /* private data for pts handling (do not modify directly). */
670 * This buffer is only needed when packets were already buffered but
671 * not decoded, for example to get the codec parameters in MPEG
674 struct AVPacketList *packet_buffer;
677 * Decoding: position of the first frame of the component, in
678 * AV_TIME_BASE fractional seconds. NEVER set this value directly:
679 * It is deduced from the AVStream values.
684 * Decoding: duration of the stream, in AV_TIME_BASE fractional
685 * seconds. Only set this value if you know none of the individual stream
686 * durations and also dont set any of them. This is deduced from the
687 * AVStream values if not set.
692 * decoding: total file size, 0 if unknown
697 * Decoding: total stream bitrate in bit/s, 0 if not
698 * available. Never set it directly if the file_size and the
699 * duration are known as FFmpeg can compute it automatically.
703 /* av_read_frame() support */
705 #if LIBAVFORMAT_VERSION_INT < (53<<16)
706 const uint8_t *cur_ptr_deprecated;
707 int cur_len_deprecated;
708 AVPacket cur_pkt_deprecated;
711 /* av_seek_frame() support */
712 int64_t data_offset; /**< offset of the first packet */
716 unsigned int packet_size;
720 #define AVFMT_NOOUTPUTLOOP -1
721 #define AVFMT_INFINITEOUTPUTLOOP 0
723 * number of times to loop output in formats that support it
728 #define AVFMT_FLAG_GENPTS 0x0001 ///< Generate missing pts even if it requires parsing future frames.
729 #define AVFMT_FLAG_IGNIDX 0x0002 ///< Ignore index.
730 #define AVFMT_FLAG_NONBLOCK 0x0004 ///< Do not block when reading packets from input.
731 #define AVFMT_FLAG_IGNDTS 0x0008 ///< Ignore DTS on frames that contain both DTS & PTS
732 #define AVFMT_FLAG_NOFILLIN 0x0010 ///< Do not infer any values from other values, just return what is stored in the container
733 #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
734 #define AVFMT_FLAG_RTP_HINT 0x0040 ///< Add RTP hinting to the output file
739 * decoding: size of data to probe; encoding: unused.
741 unsigned int probesize;
744 * Maximum time (in AV_TIME_BASE units) during which the input should
745 * be analyzed in av_find_stream_info().
747 int max_analyze_duration;
752 unsigned int nb_programs;
753 AVProgram **programs;
756 * Forced video codec_id.
757 * Demuxing: Set by user.
759 enum CodecID video_codec_id;
762 * Forced audio codec_id.
763 * Demuxing: Set by user.
765 enum CodecID audio_codec_id;
768 * Forced subtitle codec_id.
769 * Demuxing: Set by user.
771 enum CodecID subtitle_codec_id;
774 * Maximum amount of memory in bytes to use for the index of each stream.
775 * If the index exceeds this size, entries will be discarded as
776 * needed to maintain a smaller size. This can lead to slower or less
777 * accurate seeking (depends on demuxer).
778 * Demuxers for which a full in-memory index is mandatory will ignore
781 * demuxing: set by user
783 unsigned int max_index_size;
786 * Maximum amount of memory in bytes to use for buffering frames
787 * obtained from realtime capture devices.
789 unsigned int max_picture_buffer;
791 unsigned int nb_chapters;
792 AVChapter **chapters;
795 * Flags to enable debugging.
798 #define FF_FDEBUG_TS 0x0001
801 * Raw packets from the demuxer, prior to parsing and decoding.
802 * This buffer is used for buffering packets until the codec can
803 * be identified, as parsing cannot be done without knowing the
806 struct AVPacketList *raw_packet_buffer;
807 struct AVPacketList *raw_packet_buffer_end;
809 struct AVPacketList *packet_buffer_end;
811 AVMetadata *metadata;
814 * Remaining size available for raw_packet_buffer, in bytes.
815 * NOT PART OF PUBLIC API
817 #define RAW_PACKET_BUFFER_SIZE 2500000
818 int raw_packet_buffer_remaining_size;
821 * Start time of the stream in real world time, in microseconds
822 * since the unix epoch (00:00 1st January 1970). That is, pts=0
823 * in the stream was captured at this real world time.
824 * - encoding: Set by user.
825 * - decoding: Unused.
827 int64_t start_time_realtime;
830 typedef struct AVPacketList {
832 struct AVPacketList *next;
835 #if LIBAVFORMAT_VERSION_INT < (53<<16)
836 extern AVInputFormat *first_iformat;
837 extern AVOutputFormat *first_oformat;
841 * If f is NULL, returns the first registered input format,
842 * if f is non-NULL, returns the next registered input format after f
843 * or NULL if f is the last one.
845 AVInputFormat *av_iformat_next(AVInputFormat *f);
848 * If f is NULL, returns the first registered output format,
849 * if f is non-NULL, returns the next registered output format after f
850 * or NULL if f is the last one.
852 AVOutputFormat *av_oformat_next(AVOutputFormat *f);
854 enum CodecID av_guess_image2_codec(const char *filename);
856 /* XXX: Use automatic init with either ELF sections or C file parser */
860 void av_register_input_format(AVInputFormat *format);
861 void av_register_output_format(AVOutputFormat *format);
862 #if LIBAVFORMAT_VERSION_MAJOR < 53
863 attribute_deprecated AVOutputFormat *guess_stream_format(const char *short_name,
864 const char *filename,
865 const char *mime_type);
868 * @deprecated Use av_guess_format() instead.
870 attribute_deprecated AVOutputFormat *guess_format(const char *short_name,
871 const char *filename,
872 const char *mime_type);
876 * Return the output format in the list of registered output formats
877 * which best matches the provided parameters, or return NULL if
880 * @param short_name if non-NULL checks if short_name matches with the
881 * names of the registered formats
882 * @param filename if non-NULL checks if filename terminates with the
883 * extensions of the registered formats
884 * @param mime_type if non-NULL checks if mime_type matches with the
885 * MIME type of the registered formats
887 AVOutputFormat *av_guess_format(const char *short_name,
888 const char *filename,
889 const char *mime_type);
892 * Guess the codec ID based upon muxer and filename.
894 enum CodecID av_guess_codec(AVOutputFormat *fmt, const char *short_name,
895 const char *filename, const char *mime_type,
896 enum AVMediaType type);
899 * Send a nice hexadecimal dump of a buffer to the specified file stream.
901 * @param f The file stream pointer where the dump should be sent to.
903 * @param size buffer size
905 * @see av_hex_dump_log, av_pkt_dump, av_pkt_dump_log
907 void av_hex_dump(FILE *f, uint8_t *buf, int size);
910 * Send a nice hexadecimal dump of a buffer to the log.
912 * @param avcl A pointer to an arbitrary struct of which the first field is a
913 * pointer to an AVClass struct.
914 * @param level The importance level of the message, lower values signifying
917 * @param size buffer size
919 * @see av_hex_dump, av_pkt_dump, av_pkt_dump_log
921 void av_hex_dump_log(void *avcl, int level, uint8_t *buf, int size);
924 * Send a nice dump of a packet to the specified file stream.
926 * @param f The file stream pointer where the dump should be sent to.
927 * @param pkt packet to dump
928 * @param dump_payload True if the payload must be displayed, too.
930 void av_pkt_dump(FILE *f, AVPacket *pkt, int dump_payload);
933 * Send a nice dump of a packet to the log.
935 * @param avcl A pointer to an arbitrary struct of which the first field is a
936 * pointer to an AVClass struct.
937 * @param level The importance level of the message, lower values signifying
939 * @param pkt packet to dump
940 * @param dump_payload True if the payload must be displayed, too.
942 void av_pkt_dump_log(void *avcl, int level, AVPacket *pkt, int dump_payload);
945 * Initialize libavformat and register all the muxers, demuxers and
946 * protocols. If you do not call this function, then you can select
947 * exactly which formats you want to support.
949 * @see av_register_input_format()
950 * @see av_register_output_format()
951 * @see av_register_protocol()
953 void av_register_all(void);
956 * Get the CodecID for the given codec tag tag.
957 * If no codec id is found returns CODEC_ID_NONE.
959 * @param tags list of supported codec_id-codec_tag pairs, as stored
960 * in AVInputFormat.codec_tag and AVOutputFormat.codec_tag
962 enum CodecID av_codec_get_id(const struct AVCodecTag * const *tags, unsigned int tag);
965 * Get the codec tag for the given codec id id.
966 * If no codec tag is found returns 0.
968 * @param tags list of supported codec_id-codec_tag pairs, as stored
969 * in AVInputFormat.codec_tag and AVOutputFormat.codec_tag
971 unsigned int av_codec_get_tag(const struct AVCodecTag * const *tags, enum CodecID id);
973 /* media file input */
976 * Find AVInputFormat based on the short name of the input format.
978 AVInputFormat *av_find_input_format(const char *short_name);
981 * Guess the file format.
983 * @param is_opened Whether the file is already opened; determines whether
984 * demuxers with or without AVFMT_NOFILE are probed.
986 AVInputFormat *av_probe_input_format(AVProbeData *pd, int is_opened);
989 * Guess the file format.
991 * @param is_opened Whether the file is already opened; determines whether
992 * demuxers with or without AVFMT_NOFILE are probed.
993 * @param score_max A probe score larger that this is required to accept a
994 * detection, the variable is set to the actual detection
996 * If the score is <= AVPROBE_SCORE_MAX / 4 it is recommended
997 * to retry with a larger probe buffer.
999 AVInputFormat *av_probe_input_format2(AVProbeData *pd, int is_opened, int *score_max);
1002 * Allocate all the structures needed to read an input stream.
1003 * This does not open the needed codecs for decoding the stream[s].
1005 int av_open_input_stream(AVFormatContext **ic_ptr,
1006 ByteIOContext *pb, const char *filename,
1007 AVInputFormat *fmt, AVFormatParameters *ap);
1010 * Open a media file as input. The codecs are not opened. Only the file
1011 * header (if present) is read.
1013 * @param ic_ptr The opened media file handle is put here.
1014 * @param filename filename to open
1015 * @param fmt If non-NULL, force the file format to use.
1016 * @param buf_size optional buffer size (zero if default is OK)
1017 * @param ap Additional parameters needed when opening the file
1018 * (NULL if default).
1019 * @return 0 if OK, AVERROR_xxx otherwise
1021 int av_open_input_file(AVFormatContext **ic_ptr, const char *filename,
1024 AVFormatParameters *ap);
1026 #if LIBAVFORMAT_VERSION_MAJOR < 53
1028 * @deprecated Use avformat_alloc_context() instead.
1030 attribute_deprecated AVFormatContext *av_alloc_format_context(void);
1034 * Allocate an AVFormatContext.
1035 * Can be freed with av_free() but do not forget to free everything you
1036 * explicitly allocated as well!
1038 AVFormatContext *avformat_alloc_context(void);
1041 * Read packets of a media file to get stream information. This
1042 * is useful for file formats with no headers such as MPEG. This
1043 * function also computes the real framerate in case of MPEG-2 repeat
1045 * The logical file position is not changed by this function;
1046 * examined packets may be buffered for later processing.
1048 * @param ic media file handle
1049 * @return >=0 if OK, AVERROR_xxx on error
1050 * @todo Let the user decide somehow what information is needed so that
1051 * we do not waste time getting stuff the user does not need.
1053 int av_find_stream_info(AVFormatContext *ic);
1056 * Read a transport packet from a media file.
1058 * This function is obsolete and should never be used.
1059 * Use av_read_frame() instead.
1061 * @param s media file handle
1062 * @param pkt is filled
1063 * @return 0 if OK, AVERROR_xxx on error
1065 int av_read_packet(AVFormatContext *s, AVPacket *pkt);
1068 * Return the next frame of a stream.
1070 * The returned packet is valid
1071 * until the next av_read_frame() or until av_close_input_file() and
1072 * must be freed with av_free_packet. For video, the packet contains
1073 * exactly one frame. For audio, it contains an integer number of
1074 * frames if each frame has a known fixed size (e.g. PCM or ADPCM
1075 * data). If the audio frames have a variable size (e.g. MPEG audio),
1076 * then it contains one frame.
1078 * pkt->pts, pkt->dts and pkt->duration are always set to correct
1079 * values in AVStream.time_base units (and guessed if the format cannot
1080 * provide them). pkt->pts can be AV_NOPTS_VALUE if the video format
1081 * has B-frames, so it is better to rely on pkt->dts if you do not
1082 * decompress the payload.
1084 * @return 0 if OK, < 0 on error or end of file
1086 int av_read_frame(AVFormatContext *s, AVPacket *pkt);
1089 * Seek to the keyframe at timestamp.
1090 * 'timestamp' in 'stream_index'.
1091 * @param stream_index If stream_index is (-1), a default
1092 * stream is selected, and timestamp is automatically converted
1093 * from AV_TIME_BASE units to the stream specific time_base.
1094 * @param timestamp Timestamp in AVStream.time_base units
1095 * or, if no stream is specified, in AV_TIME_BASE units.
1096 * @param flags flags which select direction and seeking mode
1097 * @return >= 0 on success
1099 int av_seek_frame(AVFormatContext *s, int stream_index, int64_t timestamp,
1103 * Seek to timestamp ts.
1104 * Seeking will be done so that the point from which all active streams
1105 * can be presented successfully will be closest to ts and within min/max_ts.
1106 * Active streams are all streams that have AVStream.discard < AVDISCARD_ALL.
1108 * If flags contain AVSEEK_FLAG_BYTE, then all timestamps are in bytes and
1109 * are the file position (this may not be supported by all demuxers).
1110 * If flags contain AVSEEK_FLAG_FRAME, then all timestamps are in frames
1111 * in the stream with stream_index (this may not be supported by all demuxers).
1112 * Otherwise all timestamps are in units of the stream selected by stream_index
1113 * or if stream_index is -1, in AV_TIME_BASE units.
1114 * If flags contain AVSEEK_FLAG_ANY, then non-keyframes are treated as
1115 * keyframes (this may not be supported by all demuxers).
1117 * @param stream_index index of the stream which is used as time base reference
1118 * @param min_ts smallest acceptable timestamp
1119 * @param ts target timestamp
1120 * @param max_ts largest acceptable timestamp
1121 * @param flags flags
1122 * @return >=0 on success, error code otherwise
1124 * @note This is part of the new seek API which is still under construction.
1125 * Thus do not use this yet. It may change at any time, do not expect
1126 * ABI compatibility yet!
1128 int avformat_seek_file(AVFormatContext *s, int stream_index, int64_t min_ts, int64_t ts, int64_t max_ts, int flags);
1131 * Start playing a network-based stream (e.g. RTSP stream) at the
1134 int av_read_play(AVFormatContext *s);
1137 * Pause a network-based stream (e.g. RTSP stream).
1139 * Use av_read_play() to resume it.
1141 int av_read_pause(AVFormatContext *s);
1144 * Free a AVFormatContext allocated by av_open_input_stream.
1145 * @param s context to free
1147 void av_close_input_stream(AVFormatContext *s);
1150 * Close a media file (but not its codecs).
1152 * @param s media file handle
1154 void av_close_input_file(AVFormatContext *s);
1157 * Add a new stream to a media file.
1159 * Can only be called in the read_header() function. If the flag
1160 * AVFMTCTX_NOHEADER is in the format context, then new streams
1161 * can be added in read_packet too.
1163 * @param s media file handle
1164 * @param id file-format-dependent stream ID
1166 AVStream *av_new_stream(AVFormatContext *s, int id);
1167 AVProgram *av_new_program(AVFormatContext *s, int id);
1170 * Add a new chapter.
1171 * This function is NOT part of the public API
1172 * and should ONLY be used by demuxers.
1174 * @param s media file handle
1175 * @param id unique ID for this chapter
1176 * @param start chapter start time in time_base units
1177 * @param end chapter end time in time_base units
1178 * @param title chapter title
1180 * @return AVChapter or NULL on error
1182 AVChapter *ff_new_chapter(AVFormatContext *s, int id, AVRational time_base,
1183 int64_t start, int64_t end, const char *title);
1186 * Set the pts for a given stream.
1189 * @param pts_wrap_bits number of bits effectively used by the pts
1190 * (used for wrap control, 33 is the value for MPEG)
1191 * @param pts_num numerator to convert to seconds (MPEG: 1)
1192 * @param pts_den denominator to convert to seconds (MPEG: 90000)
1194 void av_set_pts_info(AVStream *s, int pts_wrap_bits,
1195 unsigned int pts_num, unsigned int pts_den);
1197 #define AVSEEK_FLAG_BACKWARD 1 ///< seek backward
1198 #define AVSEEK_FLAG_BYTE 2 ///< seeking based on position in bytes
1199 #define AVSEEK_FLAG_ANY 4 ///< seek to any frame, even non-keyframes
1200 #define AVSEEK_FLAG_FRAME 8 ///< seeking based on frame number
1202 int av_find_default_stream_index(AVFormatContext *s);
1205 * Get the index for a specific timestamp.
1206 * @param flags if AVSEEK_FLAG_BACKWARD then the returned index will correspond
1207 * to the timestamp which is <= the requested one, if backward
1208 * is 0, then it will be >=
1209 * if AVSEEK_FLAG_ANY seek to any frame, only keyframes otherwise
1210 * @return < 0 if no such timestamp could be found
1212 int av_index_search_timestamp(AVStream *st, int64_t timestamp, int flags);
1215 * Ensure the index uses less memory than the maximum specified in
1216 * AVFormatContext.max_index_size by discarding entries if it grows
1218 * This function is not part of the public API and should only be called
1221 void ff_reduce_index(AVFormatContext *s, int stream_index);
1224 * Add an index entry into a sorted list. Update the entry if the list
1225 * already contains it.
1227 * @param timestamp timestamp in the time base of the given stream
1229 int av_add_index_entry(AVStream *st, int64_t pos, int64_t timestamp,
1230 int size, int distance, int flags);
1233 * Perform a binary search using av_index_search_timestamp() and
1234 * AVInputFormat.read_timestamp().
1235 * This is not supposed to be called directly by a user application,
1237 * @param target_ts target timestamp in the time base of the given stream
1238 * @param stream_index stream number
1240 int av_seek_frame_binary(AVFormatContext *s, int stream_index,
1241 int64_t target_ts, int flags);
1244 * Update cur_dts of all streams based on the given timestamp and AVStream.
1246 * Stream ref_st unchanged, others set cur_dts in their native time base.
1247 * Only needed for timestamp wrapping or if (dts not set and pts!=dts).
1248 * @param timestamp new dts expressed in time_base of param ref_st
1249 * @param ref_st reference stream giving time_base of param timestamp
1251 void av_update_cur_dts(AVFormatContext *s, AVStream *ref_st, int64_t timestamp);
1254 * Perform a binary search using read_timestamp().
1255 * This is not supposed to be called directly by a user application,
1257 * @param target_ts target timestamp in the time base of the given stream
1258 * @param stream_index stream number
1260 int64_t av_gen_search(AVFormatContext *s, int stream_index,
1261 int64_t target_ts, int64_t pos_min,
1262 int64_t pos_max, int64_t pos_limit,
1263 int64_t ts_min, int64_t ts_max,
1264 int flags, int64_t *ts_ret,
1265 int64_t (*read_timestamp)(struct AVFormatContext *, int , int64_t *, int64_t ));
1270 int av_set_parameters(AVFormatContext *s, AVFormatParameters *ap);
1273 * Split a URL string into components.
1275 * The pointers to buffers for storing individual components may be null,
1276 * in order to ignore that component. Buffers for components not found are
1277 * set to empty strings. If the port is not found, it is set to a negative
1280 * @param proto the buffer for the protocol
1281 * @param proto_size the size of the proto buffer
1282 * @param authorization the buffer for the authorization
1283 * @param authorization_size the size of the authorization buffer
1284 * @param hostname the buffer for the host name
1285 * @param hostname_size the size of the hostname buffer
1286 * @param port_ptr a pointer to store the port number in
1287 * @param path the buffer for the path
1288 * @param path_size the size of the path buffer
1289 * @param url the URL to split
1291 void av_url_split(char *proto, int proto_size,
1292 char *authorization, int authorization_size,
1293 char *hostname, int hostname_size,
1295 char *path, int path_size,
1299 * Allocate the stream private data and write the stream header to an
1300 * output media file.
1302 * @param s media file handle
1303 * @return 0 if OK, AVERROR_xxx on error
1305 int av_write_header(AVFormatContext *s);
1308 * Write a packet to an output media file.
1310 * The packet shall contain one audio or video frame.
1311 * The packet must be correctly interleaved according to the container
1312 * specification, if not then av_interleaved_write_frame must be used.
1314 * @param s media file handle
1315 * @param pkt The packet, which contains the stream_index, buf/buf_size,
1317 * @return < 0 on error, = 0 if OK, 1 if end of stream wanted
1319 int av_write_frame(AVFormatContext *s, AVPacket *pkt);
1322 * Write a packet to an output media file ensuring correct interleaving.
1324 * The packet must contain one audio or video frame.
1325 * If the packets are already correctly interleaved, the application should
1326 * call av_write_frame() instead as it is slightly faster. It is also important
1327 * to keep in mind that completely non-interleaved input will need huge amounts
1328 * of memory to interleave with this, so it is preferable to interleave at the
1331 * @param s media file handle
1332 * @param pkt The packet, which contains the stream_index, buf/buf_size,
1334 * @return < 0 on error, = 0 if OK, 1 if end of stream wanted
1336 int av_interleaved_write_frame(AVFormatContext *s, AVPacket *pkt);
1339 * Interleave a packet per dts in an output media file.
1341 * Packets with pkt->destruct == av_destruct_packet will be freed inside this
1342 * function, so they cannot be used after it. Note that calling av_free_packet()
1343 * on them is still safe.
1345 * @param s media file handle
1346 * @param out the interleaved packet will be output here
1347 * @param pkt the input packet
1348 * @param flush 1 if no further packets are available as input and all
1349 * remaining packets should be output
1350 * @return 1 if a packet was output, 0 if no packet could be output,
1351 * < 0 if an error occurred
1353 int av_interleave_packet_per_dts(AVFormatContext *s, AVPacket *out,
1354 AVPacket *pkt, int flush);
1357 * Write the stream trailer to an output media file and free the
1358 * file private data.
1360 * May only be called after a successful call to av_write_header.
1362 * @param s media file handle
1363 * @return 0 if OK, AVERROR_xxx on error
1365 int av_write_trailer(AVFormatContext *s);
1367 void dump_format(AVFormatContext *ic,
1372 #if LIBAVFORMAT_VERSION_MAJOR < 53
1374 * Parse width and height out of string str.
1375 * @deprecated Use av_parse_video_frame_size instead.
1377 attribute_deprecated int parse_image_size(int *width_ptr, int *height_ptr,
1381 * Convert framerate from a string to a fraction.
1382 * @deprecated Use av_parse_video_frame_rate instead.
1384 attribute_deprecated int parse_frame_rate(int *frame_rate, int *frame_rate_base,
1389 * Parse datestr and return a corresponding number of microseconds.
1390 * @param datestr String representing a date or a duration.
1391 * - If a date the syntax is:
1393 * now|{[{YYYY-MM-DD|YYYYMMDD}[T|t| ]]{{HH[:MM[:SS[.m...]]]}|{HH[MM[SS[.m...]]]}}[Z|z]}
1395 * If the value is "now" it takes the current time.
1396 * Time is local time unless Z is appended, in which case it is
1397 * interpreted as UTC.
1398 * If the year-month-day part is not specified it takes the current
1400 * @return the number of microseconds since 1st of January, 1970 up to
1401 * the time of the parsed date or INT64_MIN if datestr cannot be
1402 * successfully parsed.
1403 * - If a duration the syntax is:
1405 * [-]HH[:MM[:SS[.m...]]]
1408 * @return the number of microseconds contained in a time interval
1409 * with the specified duration or INT64_MIN if datestr cannot be
1410 * successfully parsed.
1411 * @param duration Flag which tells how to interpret datestr, if
1412 * not zero datestr is interpreted as a duration, otherwise as a
1415 int64_t parse_date(const char *datestr, int duration);
1418 * Get the current time in microseconds.
1420 int64_t av_gettime(void);
1422 /* ffm-specific for ffserver */
1423 #define FFM_PACKET_SIZE 4096
1424 int64_t ffm_read_write_index(int fd);
1425 int ffm_write_write_index(int fd, int64_t pos);
1426 void ffm_set_write_index(AVFormatContext *s, int64_t pos, int64_t file_size);
1429 * Attempt to find a specific tag in a URL.
1431 * syntax: '?tag1=val1&tag2=val2...'. Little URL decoding is done.
1432 * Return 1 if found.
1434 int find_info_tag(char *arg, int arg_size, const char *tag1, const char *info);
1437 * Return in 'buf' the path with '%d' replaced by a number.
1439 * Also handles the '%0nd' format where 'n' is the total number
1440 * of digits and '%%'.
1442 * @param buf destination buffer
1443 * @param buf_size destination buffer size
1444 * @param path numbered sequence string
1445 * @param number frame number
1446 * @return 0 if OK, -1 on format error
1448 int av_get_frame_filename(char *buf, int buf_size,
1449 const char *path, int number);
1452 * Check whether filename actually is a numbered sequence generator.
1454 * @param filename possible numbered sequence string
1455 * @return 1 if a valid numbered sequence string, 0 otherwise
1457 int av_filename_number_test(const char *filename);
1460 * Generate an SDP for an RTP session.
1462 * @param ac array of AVFormatContexts describing the RTP streams. If the
1463 * array is composed by only one context, such context can contain
1464 * multiple AVStreams (one AVStream per RTP stream). Otherwise,
1465 * all the contexts in the array (an AVCodecContext per RTP stream)
1466 * must contain only one AVStream.
1467 * @param n_files number of AVCodecContexts contained in ac
1468 * @param buff buffer where the SDP will be stored (must be allocated by
1470 * @param size the size of the buffer
1471 * @return 0 if OK, AVERROR_xxx on error
1473 int avf_sdp_create(AVFormatContext *ac[], int n_files, char *buff, int size);
1476 * Return a positive value if the given filename has one of the given
1477 * extensions, 0 otherwise.
1479 * @param extensions a comma-separated list of filename extensions
1481 int av_match_ext(const char *filename, const char *extensions);
1483 #endif /* AVFORMAT_AVFORMAT_H */