Main libavformat public API header. More...

#include <time.h>
#include <stdio.h>
#include "libavcodec/avcodec.h"
#include "libavutil/dict.h"
#include "libavutil/log.h"
#include "avio.h"
#include "libavformat/version.h"

Classes
struct	AVProbeData
	This structure contains the data a format has to probe a file. More...

struct	AVOutputFormat

struct	AVInputFormat

struct	AVIndexEntry

struct	AVStream
	Stream structure. More...

struct	AVProgram
	New fields can be added to the end with minor version bumps. More...

struct	AVChapter

struct	AVFormatContext
	Format I/O context. More...

struct	AVPacketList

Macros
#define	AVPROBE_SCORE_RETRY (AVPROBE_SCORE_MAX/4)

#define	AVPROBE_SCORE_STREAM_RETRY (AVPROBE_SCORE_MAX/4-1)

#define	AVPROBE_SCORE_EXTENSION 50
	score for file extension

#define	AVPROBE_SCORE_MIME 75
	score for file mime type

#define	AVPROBE_SCORE_MAX 100
	maximum score

#define	AVPROBE_PADDING_SIZE 32
	extra allocated bytes at the end of the probe buffer

#define	AVFMT_NOFILE 0x0001
	Demuxer will use avio_open, no opened file should be provided by the caller.

#define	AVFMT_NEEDNUMBER 0x0002
	Needs 'd' in filename. More...

#define	AVFMT_SHOW_IDS 0x0008
	Show format stream IDs numbers. More...

#define	AVFMT_GLOBALHEADER 0x0040
	Format wants global header. More...

#define	AVFMT_NOTIMESTAMPS 0x0080
	Format does not need / have any timestamps. More...

#define	AVFMT_GENERIC_INDEX 0x0100
	Use generic index building code. More...

#define	AVFMT_TS_DISCONT 0x0200
	Format allows timestamp discontinuities. More...

#define	AVFMT_VARIABLE_FPS 0x0400
	Format allows variable fps. More...

#define	AVFMT_NODIMENSIONS 0x0800
	Format does not need width/height.

#define	AVFMT_NOSTREAMS 0x1000
	Format does not require any streams.

#define	AVFMT_NOBINSEARCH 0x2000
	Format does not allow to fall back on binary search via read_timestamp.

#define	AVFMT_NOGENSEARCH 0x4000
	Format does not allow to fall back on generic search.

#define	AVFMT_NO_BYTE_SEEK 0x8000
	Format does not allow seeking by bytes.

#define	AVFMT_ALLOW_FLUSH 0x10000
	Format allows flushing. More...

#define	AVFMT_TS_NONSTRICT 0x20000
	Format does not require strictly increasing timestamps, but they must still be monotonic.

#define	AVFMT_TS_NEGATIVE 0x40000
	Format allows muxing negative timestamps. More...

#define	AVFMT_SEEK_TO_PTS 0x4000000
	Seeking is based on PTS.

#define	AVINDEX_KEYFRAME 0x0001

#define	AVINDEX_DISCARD_FRAME

#define	AV_DISPOSITION_DEFAULT 0x0001

#define	AV_DISPOSITION_DUB 0x0002

#define	AV_DISPOSITION_ORIGINAL 0x0004

#define	AV_DISPOSITION_COMMENT 0x0008

#define	AV_DISPOSITION_LYRICS 0x0010

#define	AV_DISPOSITION_KARAOKE 0x0020

#define	AV_DISPOSITION_FORCED 0x0040
	Track should be used during playback by default. More...

#define	AV_DISPOSITION_HEARING_IMPAIRED 0x0080
	stream for hearing impaired audiences

#define	AV_DISPOSITION_VISUAL_IMPAIRED 0x0100
	stream for visual impaired audiences

#define	AV_DISPOSITION_CLEAN_EFFECTS 0x0200
	stream without voice

#define	AV_DISPOSITION_ATTACHED_PIC 0x0400
	The stream is stored in the file as an attached picture/"cover art" (e.g. More...

#define	AV_DISPOSITION_TIMED_THUMBNAILS 0x0800
	The stream is sparse, and contains thumbnail images, often corresponding to chapter markers. More...

#define	AV_DISPOSITION_CAPTIONS 0x10000
	To specify text track kind (different from subtitles default).

#define	AV_DISPOSITION_DESCRIPTIONS 0x20000

#define	AV_DISPOSITION_METADATA 0x40000

#define	AV_DISPOSITION_DEPENDENT 0x80000
	dependent audio stream (mix_type=0 in mpegts)

#define	AV_PTS_WRAP_IGNORE 0
	Options for behavior on timestamp wrap detection. More...

#define	AV_PTS_WRAP_ADD_OFFSET 1
	add the format specific offset on wrap detection

#define	AV_PTS_WRAP_SUB_OFFSET -1
	subtract the format specific offset on wrap detection

#define	AVSTREAM_EVENT_FLAG_METADATA_UPDATED 0x0001
	The call resulted in updated metadata.

#define	MAX_STD_TIMEBASES (30*12+30+3+6)

#define	MAX_REORDER_DELAY 16

#define	AV_PROGRAM_RUNNING 1

#define	AVFMTCTX_NOHEADER 0x0001
	signal that no header is present (streams are added dynamically)

#define	AVFMTCTX_UNSEEKABLE 0x0002
	signal that the stream is definitely not seekable, and attempts to call the seek function will fail. More...

#define	AVFMT_FLAG_GENPTS 0x0001
	Generate missing pts even if it requires parsing future frames.

#define	AVFMT_FLAG_IGNIDX 0x0002
	Ignore index.

#define	AVFMT_FLAG_NONBLOCK 0x0004
	Do not block when reading packets from input.

#define	AVFMT_FLAG_IGNDTS 0x0008
	Ignore DTS on frames that contain both DTS & PTS.

#define	AVFMT_FLAG_NOFILLIN 0x0010
	Do not infer any values from other values, just return what is stored in the container.

#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.

#define	AVFMT_FLAG_NOBUFFER 0x0040
	Do not buffer frames when possible.

#define	AVFMT_FLAG_CUSTOM_IO 0x0080
	The caller has supplied a custom AVIOContext, don't avio_close() it.

#define	AVFMT_FLAG_DISCARD_CORRUPT 0x0100
	Discard frames marked corrupted.

#define	AVFMT_FLAG_FLUSH_PACKETS 0x0200
	Flush the AVIOContext every packet.

#define	AVFMT_FLAG_BITEXACT 0x0400
	When muxing, try to avoid writing any random/volatile data to the output. More...

#define	AVFMT_FLAG_MP4A_LATM 0x8000
	Enable RTP MP4A-LATM payload.

#define	AVFMT_FLAG_SORT_DTS 0x10000
	try to interleave outputted packets by dts (using this flag can slow demuxing down)

#define	AVFMT_FLAG_PRIV_OPT 0x20000
	Enable use of private options by delaying codec open (this could be made default once all code is converted)

#define	AVFMT_FLAG_FAST_SEEK 0x80000
	Enable fast, but inaccurate seeks for some formats.

#define	AVFMT_FLAG_SHORTEST 0x100000
	Stop muxing when the shortest stream stops.

#define	AVFMT_FLAG_AUTO_BSF 0x200000
	Add bitstream filters as requested by the muxer.

#define	FF_FDEBUG_TS 0x0001

#define	AVFMT_EVENT_FLAG_METADATA_UPDATED 0x0001
	The call resulted in updated metadata.

#define	AVFMT_AVOID_NEG_TS_AUTO -1
	Enabled when required by target format.

#define	AVFMT_AVOID_NEG_TS_MAKE_NON_NEGATIVE 1
	Shift timestamps so they are non negative.

#define	AVFMT_AVOID_NEG_TS_MAKE_ZERO 2
	Shift timestamps so that they start at 0.

#define	AVSEEK_FLAG_BACKWARD 1

#define	AVSEEK_FLAG_BYTE 2
	seeking based on position in bytes

#define	AVSEEK_FLAG_ANY 4
	seek to any frame, even non-keyframes

#define	AVSEEK_FLAG_FRAME 8
	seeking based on frame number

#define	AVSTREAM_INIT_IN_WRITE_HEADER 0
	stream parameters initialized in avformat_write_header

#define	AVSTREAM_INIT_IN_INIT_OUTPUT 1
	stream parameters initialized in avformat_init_output

#define	AV_FRAME_FILENAME_FLAGS_MULTIPLE 1
	Allow multiple d.

Typedefs
typedef struct AVProbeData	AVProbeData
	This structure contains the data a format has to probe a file.

typedef struct AVOutputFormat	AVOutputFormat

typedef struct AVInputFormat	AVInputFormat

typedef struct AVIndexEntry	AVIndexEntry

typedef struct AVStreamInternal	AVStreamInternal

typedef struct AVStream	AVStream
	Stream structure. More...

typedef struct AVProgram	AVProgram
	New fields can be added to the end with minor version bumps. More...

typedef struct AVChapter	AVChapter

typedef int(*	av_format_control_message) (struct AVFormatContext s, int type, void data, size_t data_size)
	Callback used by devices to communicate with application.

typedef int(*	AVOpenCallback) (struct AVFormatContext s, AVIOContext pb, const char url, int flags, const AVIOInterruptCB int_cb, AVDictionary *options)

typedef struct AVFormatInternal	AVFormatInternal

typedef struct AVFormatContext	AVFormatContext
	Format I/O context. More...

typedef struct AVPacketList	AVPacketList

Enumerations
enum	AVStreamParseType { AVSTREAM_PARSE_NONE, AVSTREAM_PARSE_FULL, AVSTREAM_PARSE_HEADERS, AVSTREAM_PARSE_TIMESTAMPS, AVSTREAM_PARSE_FULL_ONCE, AVSTREAM_PARSE_FULL_RAW }

enum	AVDurationEstimationMethod { AVFMT_DURATION_FROM_PTS, AVFMT_DURATION_FROM_STREAM, AVFMT_DURATION_FROM_BITRATE }
	The duration of a video can be estimated through various ways, and this enum can be used to know how the duration was estimated. More...

enum	AVTimebaseSource { AVFMT_TBCF_AUTO = -1, AVFMT_TBCF_DECODER, AVFMT_TBCF_DEMUXER }

Functions
int	av_get_packet (AVIOContext s, AVPacket pkt, int size)
	Allocate and read the payload of a packet and initialize its fields with default values. More...

int	av_append_packet (AVIOContext s, AVPacket pkt, int size)
	Read data and append it to the current content of the AVPacket. More...

struct AVCodecParserContext *	av_stream_get_parser (const AVStream *s)

int64_t	av_stream_get_end_pts (const AVStream *st)
	Returns the pts of the last muxed packet + its duration. More...

void	av_format_inject_global_side_data (AVFormatContext *s)
	This function will cause global side data to be injected in the next packet of each stream as well as after any subsequent seek.

enum AVDurationEstimationMethod	av_fmt_ctx_get_duration_estimation_method (const AVFormatContext *ctx)
	Returns the method used to set ctx->duration. More...

unsigned	avformat_version (void)
	Return the LIBAVFORMAT_VERSION_INT constant.

const char *	avformat_configuration (void)
	Return the libavformat build-time configuration.

const char *	avformat_license (void)
	Return the libavformat license.

int	avformat_network_init (void)
	Do global initialization of network libraries. More...

int	avformat_network_deinit (void)
	Undo the initialization done by avformat_network_init. More...

const AVOutputFormat *	av_muxer_iterate (void **opaque)
	Iterate over all registered muxers. More...

const AVInputFormat *	av_demuxer_iterate (void **opaque)
	Iterate over all registered demuxers. More...

AVFormatContext *	avformat_alloc_context (void)
	Allocate an AVFormatContext. More...

void	avformat_free_context (AVFormatContext *s)
	Free an AVFormatContext and all its streams. More...

const AVClass *	avformat_get_class (void)
	Get the AVClass for AVFormatContext. More...

AVStream *	avformat_new_stream (AVFormatContext s, const AVCodec c)
	Add a new stream to a media file. More...

int	av_stream_add_side_data (AVStream st, enum AVPacketSideDataType type, uint8_t data, size_t size)
	Wrap an existing array as stream side data. More...

uint8_t *	av_stream_new_side_data (AVStream *stream, enum AVPacketSideDataType type, int size)
	Allocate new information from stream. More...

uint8_t *	av_stream_get_side_data (const AVStream stream, enum AVPacketSideDataType type, int size)
	Get side information from stream. More...

AVProgram *	av_new_program (AVFormatContext *s, int id)

int	avformat_alloc_output_context2 (AVFormatContext *ctx, AVOutputFormat oformat, const char format_name, const char filename)
	Allocate an AVFormatContext for an output format. More...

AVInputFormat *	av_find_input_format (const char *short_name)
	Find AVInputFormat based on the short name of the input format.

AVInputFormat *	av_probe_input_format (AVProbeData *pd, int is_opened)
	Guess the file format. More...

AVInputFormat *	av_probe_input_format2 (AVProbeData pd, int is_opened, int score_max)
	Guess the file format. More...

AVInputFormat *	av_probe_input_format3 (AVProbeData pd, int is_opened, int score_ret)
	Guess the file format. More...

int	av_probe_input_buffer2 (AVIOContext pb, AVInputFormat fmt, const char url, void *logctx, unsigned int offset, unsigned int max_probe_size)
	Probe a bytestream to determine the input format. More...

int	av_probe_input_buffer (AVIOContext pb, AVInputFormat fmt, const char url, void *logctx, unsigned int offset, unsigned int max_probe_size)
	Like av_probe_input_buffer2() but returns 0 on success.

int	avformat_open_input (AVFormatContext *ps, const char url, AVInputFormat fmt, AVDictionary *options)
	Open an input stream and read the header. More...

attribute_deprecated int	av_demuxer_open (AVFormatContext *ic)

int	avformat_find_stream_info (AVFormatContext ic, AVDictionary *options)
	Read packets of a media file to get stream information. More...

AVProgram *	av_find_program_from_stream (AVFormatContext ic, AVProgram last, int s)
	Find the programs which belong to a given stream. More...

void	av_program_add_stream_index (AVFormatContext *ac, int progid, unsigned int idx)

int	av_find_best_stream (AVFormatContext ic, enum AVMediaType type, int wanted_stream_nb, int related_stream, AVCodec *decoder_ret, int flags)
	Find the "best" stream in the file. More...

int	av_read_frame (AVFormatContext s, AVPacket pkt)
	Return the next frame of a stream. More...

int	av_seek_frame (AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
	Seek to the keyframe at timestamp. More...

int	avformat_seek_file (AVFormatContext *s, int stream_index, int64_t min_ts, int64_t ts, int64_t max_ts, int flags)
	Seek to timestamp ts. More...

int	avformat_flush (AVFormatContext *s)
	Discard all internally buffered data. More...

int	av_read_play (AVFormatContext *s)
	Start playing a network-based stream (e.g. More...

int	av_read_pause (AVFormatContext *s)
	Pause a network-based stream (e.g. More...

void	avformat_close_input (AVFormatContext **s)
	Close an opened input AVFormatContext. More...

av_warn_unused_result int	avformat_write_header (AVFormatContext s, AVDictionary *options)
	Allocate the stream private data and write the stream header to an output media file. More...

av_warn_unused_result int	avformat_init_output (AVFormatContext s, AVDictionary *options)
	Allocate the stream private data and initialize the codec, but do not write the header. More...

int	av_write_frame (AVFormatContext s, AVPacket pkt)
	Write a packet to an output media file. More...

int	av_interleaved_write_frame (AVFormatContext s, AVPacket pkt)
	Write a packet to an output media file ensuring correct interleaving. More...

int	av_write_uncoded_frame (AVFormatContext s, int stream_index, AVFrame frame)
	Write an uncoded frame to an output media file. More...

int	av_interleaved_write_uncoded_frame (AVFormatContext s, int stream_index, AVFrame frame)
	Write an uncoded frame to an output media file. More...

int	av_write_uncoded_frame_query (AVFormatContext *s, int stream_index)
	Test whether a muxer supports uncoded frame. More...

int	av_write_trailer (AVFormatContext *s)
	Write the stream trailer to an output media file and free the file private data. More...

AVOutputFormat *	av_guess_format (const char short_name, const char filename, const char *mime_type)
	Return the output format in the list of registered output formats which best matches the provided parameters, or return NULL if there is no match. More...

enum AVCodecID	av_guess_codec (AVOutputFormat fmt, const char short_name, const char filename, const char mime_type, enum AVMediaType type)
	Guess the codec ID based upon muxer and filename.

int	av_get_output_timestamp (struct AVFormatContext s, int stream, int64_t dts, int64_t *wall)
	Get timing information for the data currently output. More...

void	av_hex_dump (FILE f, const uint8_t buf, int size)
	Send a nice hexadecimal dump of a buffer to the specified file stream. More...

void	av_hex_dump_log (void avcl, int level, const uint8_t buf, int size)
	Send a nice hexadecimal dump of a buffer to the log. More...

void	av_pkt_dump2 (FILE f, const AVPacket pkt, int dump_payload, const AVStream *st)
	Send a nice dump of a packet to the specified file stream. More...

void	av_pkt_dump_log2 (void avcl, int level, const AVPacket pkt, int dump_payload, const AVStream *st)
	Send a nice dump of a packet to the log. More...

enum AVCodecID	av_codec_get_id (const struct AVCodecTag const tags, unsigned int tag)
	Get the AVCodecID for the given codec tag tag. More...

unsigned int	av_codec_get_tag (const struct AVCodecTag const tags, enum AVCodecID id)
	Get the codec tag for the given codec id id. More...

int	av_codec_get_tag2 (const struct AVCodecTag const tags, enum AVCodecID id, unsigned int *tag)
	Get the codec tag for the given codec id. More...

int	av_find_default_stream_index (AVFormatContext *s)

int	av_index_search_timestamp (AVStream *st, int64_t timestamp, int flags)
	Get the index for a specific timestamp. More...

int	av_add_index_entry (AVStream *st, int64_t pos, int64_t timestamp, int size, int distance, int flags)
	Add an index entry into a sorted list. More...

void	av_url_split (char proto, int proto_size, char authorization, int authorization_size, char hostname, int hostname_size, int port_ptr, char path, int path_size, const char url)
	Split a URL string into components. More...

void	av_dump_format (AVFormatContext ic, int index, const char url, int is_output)
	Print detailed information about the input or output format, such as duration, bitrate, streams, container, programs, metadata, side data, codec and time base. More...

int	av_get_frame_filename2 (char buf, int buf_size, const char path, int number, int flags)
	Return in 'buf' the path with 'd' replaced by a number. More...

int	av_get_frame_filename (char buf, int buf_size, const char path, int number)

int	av_filename_number_test (const char *filename)
	Check whether filename actually is a numbered sequence generator. More...

int	av_sdp_create (AVFormatContext ac[], int n_files, char buf, int size)
	Generate an SDP for an RTP session. More...

int	av_match_ext (const char filename, const char extensions)
	Return a positive value if the given filename has one of the given extensions, 0 otherwise. More...

int	avformat_query_codec (const AVOutputFormat *ofmt, enum AVCodecID codec_id, int std_compliance)
	Test if the given container can store a codec. More...

const struct AVCodecTag *	avformat_get_riff_video_tags (void)

const struct AVCodecTag *	avformat_get_riff_audio_tags (void)

const struct AVCodecTag *	avformat_get_mov_video_tags (void)

const struct AVCodecTag *	avformat_get_mov_audio_tags (void)

AVRational	av_guess_sample_aspect_ratio (AVFormatContext format, AVStream stream, AVFrame *frame)
	Guess the sample aspect ratio of a frame, based on both the stream and the frame aspect ratio. More...

AVRational	av_guess_frame_rate (AVFormatContext ctx, AVStream stream, AVFrame *frame)
	Guess the frame rate, based on both the container and codec information. More...

int	avformat_match_stream_specifier (AVFormatContext s, AVStream st, const char *spec)
	Check if the stream st contained in s is matched by the stream specifier spec. More...

int	avformat_queue_attached_pictures (AVFormatContext *s)

int	avformat_transfer_internal_stream_timing_info (const AVOutputFormat ofmt, AVStream ost, const AVStream *ist, enum AVTimebaseSource copy_tb)
	Transfer internal timing information from one stream to another. More...

AVRational	av_stream_get_codec_timebase (const AVStream *st)
	Get the internal codec timebase from a stream. More...

Detailed Description

Main libavformat public API header.

Macro Definition Documentation

§ AV_DISPOSITION_ATTACHED_PIC

#define AV_DISPOSITION_ATTACHED_PIC 0x0400

The stream is stored in the file as an attached picture/"cover art" (e.g.

APIC frame in ID3v2). The first (usually only) packet associated with it will be returned among the first few packets read from the file unless seeking takes place. It can also be accessed at any time in AVStream.attached_pic.

§ AV_DISPOSITION_FORCED

#define AV_DISPOSITION_FORCED 0x0040

Track should be used during playback by default.

Useful for subtitle track that should be displayed even when user did not explicitly ask for subtitles.

§ AV_DISPOSITION_TIMED_THUMBNAILS

#define AV_DISPOSITION_TIMED_THUMBNAILS 0x0800

The stream is sparse, and contains thumbnail images, often corresponding to chapter markers.

Only ever used with AV_DISPOSITION_ATTACHED_PIC.

§ AV_PTS_WRAP_IGNORE

#define AV_PTS_WRAP_IGNORE 0

Options for behavior on timestamp wrap detection.

ignore the wrap

§ AVFMT_ALLOW_FLUSH

#define AVFMT_ALLOW_FLUSH 0x10000

Format allows flushing.

If not set, the muxer will not receive a NULL packet in the write_packet function.

§ AVFMT_FLAG_BITEXACT

#define AVFMT_FLAG_BITEXACT 0x0400

When muxing, try to avoid writing any random/volatile data to the output.

This includes any random IDs, real-time timestamps/dates, muxer version, etc.

This flag is mainly intended for testing.

§ AVFMT_GENERIC_INDEX

#define AVFMT_GENERIC_INDEX 0x0100

Use generic index building code.

§ AVFMT_GLOBALHEADER

#define AVFMT_GLOBALHEADER 0x0040

Format wants global header.

§ AVFMT_NEEDNUMBER

#define AVFMT_NEEDNUMBER 0x0002

Needs 'd' in filename.

§ AVFMT_NOTIMESTAMPS

#define AVFMT_NOTIMESTAMPS 0x0080

Format does not need / have any timestamps.

§ AVFMT_SHOW_IDS

#define AVFMT_SHOW_IDS 0x0008

Show format stream IDs numbers.

§ AVFMT_TS_DISCONT

#define AVFMT_TS_DISCONT 0x0200

Format allows timestamp discontinuities.

Note, muxers always require valid (monotone) timestamps

§ AVFMT_TS_NEGATIVE

#define AVFMT_TS_NEGATIVE 0x40000

Format allows muxing negative timestamps.

If not set the timestamp will be shifted in av_write_frame and av_interleaved_write_frame so they start from 0. The user or muxer can override this through AVFormatContext.avoid_negative_ts

§ AVFMT_VARIABLE_FPS

#define AVFMT_VARIABLE_FPS 0x0400

Format allows variable fps.

§ AVFMTCTX_UNSEEKABLE

#define AVFMTCTX_UNSEEKABLE 0x0002

signal that the stream is definitely not seekable, and attempts to call the seek function will fail.

For some network protocols (e.g. HLS), this can change dynamically at runtime.

§ AVINDEX_DISCARD_FRAME

#define AVINDEX_DISCARD_FRAME

Value:

0x0002

§ AVSEEK_FLAG_BACKWARD

#define AVSEEK_FLAG_BACKWARD 1

seek backward

Typedef Documentation

§ AVFormatContext

typedef struct AVFormatContext AVFormatContext

Format I/O context.

New fields can be added to the end with minor version bumps. Removal, reordering and changes to existing fields require a major version bump. sizeof(AVFormatContext) must not be used outside libav*, use avformat_alloc_context() to create an AVFormatContext.

Fields can be accessed through AVOptions (av_opt*), the name string used matches the associated command line parameter name and can be found in libavformat/options_table.h. The AVOption/command line parameter names differ in some cases from the C structure field names for historic reasons or brevity.

§ AVProgram

typedef struct AVProgram AVProgram

New fields can be added to the end with minor version bumps.

Removal, reordering and changes to existing fields require a major version bump. sizeof(AVProgram) must not be used outside libav*.

§ AVStream

typedef struct AVStream AVStream

Stream structure.

New fields can be added to the end with minor version bumps. Removal, reordering and changes to existing fields require a major version bump. sizeof(AVStream) must not be used outside libav*.

Enumeration Type Documentation

§ AVDurationEstimationMethod

enum AVDurationEstimationMethod

The duration of a video can be estimated through various ways, and this enum can be used to know how the duration was estimated.

Enumerator
AVFMT_DURATION_FROM_PTS	Duration accurately estimated from PTSes.
AVFMT_DURATION_FROM_STREAM	Duration estimated from a stream with a known duration.
AVFMT_DURATION_FROM_BITRATE	Duration estimated from bitrate (less accurate)

§ AVStreamParseType

enum AVStreamParseType

Enumerator
AVSTREAM_PARSE_FULL	full parsing and repack
AVSTREAM_PARSE_HEADERS	Only parse headers, do not repack.
AVSTREAM_PARSE_TIMESTAMPS	full parsing and interpolation of timestamps for frames not starting on a packet boundary
AVSTREAM_PARSE_FULL_ONCE	full parsing and repack of the first frame only, only implemented for H.264 currently
AVSTREAM_PARSE_FULL_RAW	full parsing and repack with timestamp and position generation by parser for raw this assumes that each packet in the file contains no demuxer level headers and just codec level data, otherwise position generation would fail

Function Documentation

§ av_append_packet()

int av_append_packet	(	AVIOContext *	s,
		AVPacket *	pkt,
		int	size
	)

Read data and append it to the current content of the AVPacket.

If pkt->size is 0 this is identical to av_get_packet. Note that this uses av_grow_packet and thus involves a realloc which is inefficient. Thus this function should only be used when there is no reasonable way to know (an upper bound of) the final size.

Parameters

s	associated IO context
pkt	packet
size	amount of data to read

Returns: >0 (read size) if OK, AVERROR_xxx otherwise, previous data will not be lost even if an error occurs.

§ av_fmt_ctx_get_duration_estimation_method()

enum AVDurationEstimationMethod av_fmt_ctx_get_duration_estimation_method ( const AVFormatContext * ctx )

Returns the method used to set ctx->duration.

Returns: AVFMT_DURATION_FROM_PTS, AVFMT_DURATION_FROM_STREAM, or AVFMT_DURATION_FROM_BITRATE.

§ av_get_packet()

int av_get_packet	(	AVIOContext *	s,
		AVPacket *	pkt,
		int	size
	)

Allocate and read the payload of a packet and initialize its fields with default values.

Parameters

s	associated IO context
pkt	packet
size	desired payload size

Returns: >0 (read size) if OK, AVERROR_xxx otherwise

§ av_stream_get_end_pts()

int64_t av_stream_get_end_pts ( const AVStream * st )

Returns the pts of the last muxed packet + its duration.

the retuned value is undefined when used with a demuxer.

§ avformat_alloc_output_context2()

int avformat_alloc_output_context2	(	AVFormatContext **	ctx,
		AVOutputFormat *	oformat,
		const char *	format_name,
		const char *	filename
	)

Allocate an AVFormatContext for an output format.

avformat_free_context() can be used to free the context and everything allocated by the framework within it.

Parameters

*ctx	is set to the created format context, or to NULL in case of failure
oformat	format to use for allocating the context, if NULL format_name and filename are used instead
format_name	the name of output format to use for allocating the context, if NULL filename is used instead
filename	the name of the filename to use for allocating the context, may be NULL

Returns: >= 0 in case of success, a negative AVERROR code in case of failure

Classes

Macros

Typedefs

Enumerations

Functions

Detailed Description

Macro Definition Documentation

§ AV_DISPOSITION_ATTACHED_PIC

§ AV_DISPOSITION_FORCED

§ AV_DISPOSITION_TIMED_THUMBNAILS

§ AV_PTS_WRAP_IGNORE

§ AVFMT_ALLOW_FLUSH

§ AVFMT_FLAG_BITEXACT

§ AVFMT_GENERIC_INDEX

§ AVFMT_GLOBALHEADER

§ AVFMT_NEEDNUMBER

§ AVFMT_NOTIMESTAMPS

§ AVFMT_SHOW_IDS

§ AVFMT_TS_DISCONT

§ AVFMT_TS_NEGATIVE

§ AVFMT_VARIABLE_FPS

§ AVFMTCTX_UNSEEKABLE

§ AVINDEX_DISCARD_FRAME

§ AVSEEK_FLAG_BACKWARD

Typedef Documentation

§ AVFormatContext

§ AVProgram

§ AVStream

Enumeration Type Documentation

§ AVDurationEstimationMethod

§ AVStreamParseType

Function Documentation

§ av_append_packet()

§ av_fmt_ctx_get_duration_estimation_method()

§ av_get_packet()

§ av_stream_get_end_pts()

§ avformat_alloc_output_context2()