libavformat/utils.c File Reference

various utility functions for use within FFmpeg More...

#include "avformat.h"
#include "avio_internal.h"
#include "internal.h"
#include "libavcodec/internal.h"
#include "libavcodec/raw.h"
#include "libavutil/opt.h"
#include "libavutil/dict.h"
#include "libavutil/pixdesc.h"
#include "metadata.h"
#include "id3v2.h"
#include "libavutil/avstring.h"
#include "riff.h"
#include "audiointerleave.h"
#include "url.h"
#include <sys/time.h>
#include <time.h>
#include <strings.h>
#include <stdarg.h>
#include <assert.h>
#include "libavutil/parseutils.h"

Go to the source code of this file.

Defines

#define LICENSE_PREFIX   "libavformat license: "

#define PROBE_BUF_MIN   2048

size of probe buffer, for guessing file type from file contents

#define PROBE_BUF_MAX   (1<<20)

#define DURATION_MAX_READ_SIZE   250000

#define DURATION_MAX_RETRY   3

#define PRINT(...)   do { if (!f) av_log(avcl, level, __VA_ARGS__); else fprintf(f, __VA_ARGS__); } while(0)

#define PRINT(...)   do { if (!f) av_log(avcl, level, __VA_ARGS__); else fprintf(f, __VA_ARGS__); } while(0)

Functions

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.

static void av_frac_init (AVFrac *f, int64_t val, int64_t num, int64_t den)

f = val + (num / den) + 0.5.

static void av_frac_add (AVFrac *f, int64_t incr)

Fractional addition to f: f = f + (incr / f->den).

AVInputFormat * av_iformat_next (AVInputFormat *f)

If f is NULL, returns the first registered input format, if f is non-NULL, returns the next registered input format after f or NULL if f is the last one.

AVOutputFormat * av_oformat_next (AVOutputFormat *f)

If f is NULL, returns the first registered output format, if f is non-NULL, returns the next registered output format after f or NULL if f is the last one.

void av_register_input_format (AVInputFormat *format)

void av_register_output_format (AVOutputFormat *format)

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.

static int match_format (const char *name, const char *names)

AVOutputFormat * guess_format (const char *short_name, const char *filename, const char *mime_type)

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.

AVOutputFormat * guess_stream_format (const char *short_name, const char *filename, const char *mime_type)

enum CodecID 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.

AVInputFormat * av_find_input_format (const char *short_name)

Find AVInputFormat based on the short name of the input format.

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.

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

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

int av_filename_number_test (const char *filename)

Check whether filename actually is a numbered sequence generator.

AVInputFormat * av_probe_input_format3 (AVProbeData *pd, int is_opened, int *score_ret)

Guess the file format.

AVInputFormat * av_probe_input_format2 (AVProbeData *pd, int is_opened, int *score_max)

Guess the file format.

AVInputFormat * av_probe_input_format (AVProbeData *pd, int is_opened)

Guess the file format.

static int set_codec_from_probe_data (AVFormatContext *s, AVStream *st, AVProbeData *pd)

static AVDictionary * convert_format_parameters (AVFormatParameters *ap)

int av_open_input_stream (AVFormatContext **ic_ptr, AVIOContext *pb, const char *filename, AVInputFormat *fmt, AVFormatParameters *ap)

Open a media file from an IO stream.

int av_demuxer_open (AVFormatContext *ic, AVFormatParameters *ap)

int av_probe_input_buffer (AVIOContext *pb, AVInputFormat **fmt, const char *filename, void *logctx, unsigned int offset, unsigned int max_probe_size)

Probe a bytestream to determine the input format.

int av_open_input_file (AVFormatContext **ic_ptr, const char *filename, AVInputFormat *fmt, int buf_size, AVFormatParameters *ap)

Open a media file as input.

static int init_input (AVFormatContext *s, const char *filename)

int avformat_open_input (AVFormatContext **ps, const char *filename, AVInputFormat *fmt, AVDictionary **options)

Open an input stream and read the header.

static AVPacket * add_to_pktbuf (AVPacketList **packet_buffer, AVPacket *pkt, AVPacketList **plast_pktl)

int av_read_packet (AVFormatContext *s, AVPacket *pkt)

Read a transport packet from a media file.

static int get_audio_frame_size (AVCodecContext *enc, int size)

Get the number of samples of an audio frame.

static void compute_frame_duration (int *pnum, int *pden, AVStream *st, AVCodecParserContext *pc, AVPacket *pkt)

Return the frame duration in seconds.

static int is_intra_only (AVCodecContext *enc)

static void update_initial_timestamps (AVFormatContext *s, int stream_index, int64_t dts, int64_t pts)

static void update_initial_durations (AVFormatContext *s, AVStream *st, AVPacket *pkt)

static void compute_pkt_fields (AVFormatContext *s, AVStream *st, AVCodecParserContext *pc, AVPacket *pkt)

static int av_read_frame_internal (AVFormatContext *s, AVPacket *pkt)

int av_read_frame (AVFormatContext *s, AVPacket *pkt)

Return the next frame of a stream.

static void flush_packet_queue (AVFormatContext *s)

int av_find_default_stream_index (AVFormatContext *s)

void ff_read_frame_flush (AVFormatContext *s)

Flush the frame reader.

void av_update_cur_dts (AVFormatContext *s, AVStream *ref_st, int64_t timestamp)

Update cur_dts of all streams based on the given timestamp and AVStream.

void ff_reduce_index (AVFormatContext *s, int stream_index)

Ensure the index uses less memory than the maximum specified in AVFormatContext.max_index_size by discarding entries if it grows too large.

int ff_add_index_entry (AVIndexEntry **index_entries, int *nb_index_entries, unsigned int *index_entries_allocated_size, int64_t pos, int64_t timestamp, int size, int distance, int flags)

Internal version of av_add_index_entry.

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.

int ff_index_search_timestamp (const AVIndexEntry *entries, int nb_entries, int64_t wanted_timestamp, int flags)

Internal version of av_index_search_timestamp.

int av_index_search_timestamp (AVStream *st, int64_t wanted_timestamp, int flags)

Get the index for a specific timestamp.

int av_seek_frame_binary (AVFormatContext *s, int stream_index, int64_t target_ts, int flags)

Perform a binary search using av_index_search_timestamp() and AVInputFormat.read_timestamp().

int64_t av_gen_search (AVFormatContext *s, int stream_index, int64_t target_ts, int64_t pos_min, int64_t pos_max, int64_t pos_limit, int64_t ts_min, int64_t ts_max, int flags, int64_t *ts_ret, int64_t(*read_timestamp)(struct AVFormatContext *, int, int64_t *, int64_t))

Perform a binary search using read_timestamp().

static int av_seek_frame_byte (AVFormatContext *s, int stream_index, int64_t pos, int flags)

static int av_seek_frame_generic (AVFormatContext *s, int stream_index, int64_t timestamp, int flags)

int av_seek_frame (AVFormatContext *s, int stream_index, int64_t timestamp, int flags)

Seek to the keyframe at timestamp.

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.

static int av_has_duration (AVFormatContext *ic)

Return TRUE if the stream has accurate duration in any stream.

static void av_update_stream_timings (AVFormatContext *ic)

Estimate the stream timings from the one of each components.

static void fill_all_stream_timings (AVFormatContext *ic)

static void av_estimate_timings_from_bit_rate (AVFormatContext *ic)

static void av_estimate_timings_from_pts (AVFormatContext *ic, int64_t old_offset)

static void av_estimate_timings (AVFormatContext *ic, int64_t old_offset)

static int has_codec_parameters (AVCodecContext *enc)

static int has_decode_delay_been_guessed (AVStream *st)

static int try_decode_frame (AVStream *st, AVPacket *avpkt, AVDictionary **options)

unsigned int ff_codec_get_tag (const AVCodecTag *tags, enum CodecID id)

enum CodecID ff_codec_get_id (const AVCodecTag *tags, unsigned int tag)

unsigned int av_codec_get_tag (const AVCodecTag *const *tags, enum CodecID id)

enum CodecID av_codec_get_id (const AVCodecTag *const *tags, unsigned int tag)

static void compute_chapters_end (AVFormatContext *s)

static int get_std_framerate (int i)

static int tb_unreliable (AVCodecContext *c)

int av_find_stream_info (AVFormatContext *ic)

Read packets of a media file to get stream information.

int avformat_find_stream_info (AVFormatContext *ic, AVDictionary **options)

Read packets of a media file to get stream information.

static AVProgram * find_program_from_stream (AVFormatContext *ic, int s)

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.

int av_read_play (AVFormatContext *s)

Start playing a network-based stream (e.g.

int av_read_pause (AVFormatContext *s)

Pause a network-based stream (e.g.

void av_close_input_stream (AVFormatContext *s)

Free a AVFormatContext allocated by av_open_input_stream.

void avformat_free_context (AVFormatContext *s)

Free an AVFormatContext and all its streams.

void av_close_input_file (AVFormatContext *s)

Close a media file (but not its codecs).

AVStream * av_new_stream (AVFormatContext *s, int id)

Add a new stream to a media file.

AVProgram * av_new_program (AVFormatContext *ac, int id)

AVChapter * ff_new_chapter (AVFormatContext *s, int id, AVRational time_base, int64_t start, int64_t end, const char *title)

Add a new chapter.

int av_set_parameters (AVFormatContext *s, AVFormatParameters *ap)

media file output

int avformat_alloc_output_context2 (AVFormatContext **avctx, AVOutputFormat *oformat, const char *format, const char *filename)

Allocate an AVFormatContext for an output format.

AVFormatContext * avformat_alloc_output_context (const char *format, AVOutputFormat *oformat, const char *filename)

static int validate_codec_tag (AVFormatContext *s, AVStream *st)

int av_write_header (AVFormatContext *s)

Allocate the stream private data and write the stream header to an output media file.

int avformat_write_header (AVFormatContext *s, AVDictionary **options)

Allocate the stream private data and write the stream header to an output media file.

static int compute_pkt_fields2 (AVFormatContext *s, AVStream *st, AVPacket *pkt)

int av_write_frame (AVFormatContext *s, AVPacket *pkt)

Write a packet to an output media file.

void ff_interleave_add_packet (AVFormatContext *s, AVPacket *pkt, int(*compare)(AVFormatContext *, AVPacket *, AVPacket *))

Add packet to AVFormatContext->packet_buffer list, determining its interleaved position using compare() function argument.

static int ff_interleave_compare_dts (AVFormatContext *s, AVPacket *next, AVPacket *pkt)

int av_interleave_packet_per_dts (AVFormatContext *s, AVPacket *out, AVPacket *pkt, int flush)

Interleave a packet per dts in an output media file.

static int av_interleave_packet (AVFormatContext *s, AVPacket *out, AVPacket *in, int flush)

Interleave an AVPacket correctly so it can be muxed.

int av_interleaved_write_frame (AVFormatContext *s, AVPacket *pkt)

Write a packet to an output media file ensuring correct interleaving.

int av_write_trailer (AVFormatContext *s)

Write the stream trailer to an output media file and free the file private data.

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

static void print_fps (double d, const char *postfix)

static void dump_metadata (void *ctx, AVDictionary *m, const char *indent)

static void dump_stream_format (AVFormatContext *ic, int i, int index, int is_output)

void dump_format (AVFormatContext *ic, int index, const char *url, int is_output)

void av_dump_format (AVFormatContext *ic, int index, const char *url, int is_output)

int parse_image_size (int *width_ptr, int *height_ptr, const char *str)

Parse width and height out of string str.

int parse_frame_rate (int *frame_rate_num, int *frame_rate_den, const char *arg)

Convert framerate from a string to a fraction.

int64_t av_gettime (void)

Get the current time in microseconds.

uint64_t ff_ntp_time (void)

Get the current time since NTP epoch in microseconds.

int64_t parse_date (const char *timestr, int duration)

Parse datestr and return a corresponding number of microseconds.

int find_info_tag (char *arg, int arg_size, const char *tag1, const char *info)

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

Return in 'buf' the path with 'd' replaced by a number.

static void hex_dump_internal (void *avcl, FILE *f, int level, uint8_t *buf, int size)

void av_hex_dump (FILE *f, uint8_t *buf, int size)

Send a nice hexadecimal dump of a buffer to the specified file stream.

void av_hex_dump_log (void *avcl, int level, uint8_t *buf, int size)

Send a nice hexadecimal dump of a buffer to the log.

static void pkt_dump_internal (void *avcl, FILE *f, int level, AVPacket *pkt, int dump_payload, AVRational time_base)

void av_pkt_dump (FILE *f, AVPacket *pkt, int dump_payload)

void av_pkt_dump2 (FILE *f, AVPacket *pkt, int dump_payload, AVStream *st)

Send a nice dump of a packet to the specified file stream.

void av_pkt_dump_log (void *avcl, int level, AVPacket *pkt, int dump_payload)

void av_pkt_dump_log2 (void *avcl, int level, AVPacket *pkt, int dump_payload, AVStream *st)

Send a nice dump of a packet to the log.

attribute_deprecated void ff_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)

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.

char * ff_data_to_hex (char *buff, const uint8_t *src, int s, int lowercase)

int ff_hex_to_data (uint8_t *data, const char *p)

Parse a string of hexadecimal strings.

void av_set_pts_info (AVStream *s, int pts_wrap_bits, unsigned int pts_num, unsigned int pts_den)

Set the pts for a given stream.

int ff_url_join (char *str, int size, const char *proto, const char *authorization, const char *hostname, int port, const char *fmt,...)

Assemble a URL string from components.

int ff_write_chained (AVFormatContext *dst, int dst_stream, AVPacket *pkt, AVFormatContext *src)

Write a packet to another muxer than the one the user originally intended.

void ff_parse_key_value (const char *str, ff_parse_key_val_cb callback_get_buf, void *context)

Parse a string with comma-separated key=value pairs.

int ff_find_stream_index (AVFormatContext *s, int id)

Find stream index based on format-specific stream ID.

void ff_make_absolute_url (char *buf, int size, const char *base, const char *rel)

Variables

AVInputFormat * first_iformat = NULL

head of registered input format linked list

AVOutputFormat * first_oformat = NULL

head of registered output format linked list

Detailed Description

various utility functions for use within FFmpeg

Definition in file utils.c.

Define Documentation

#define DURATION_MAX_READ_SIZE 250000

Definition at line 2030 of file utils.c.

Referenced by av_estimate_timings_from_pts().

#define DURATION_MAX_RETRY 3

Definition at line 2031 of file utils.c.

Referenced by av_estimate_timings_from_pts().

#define LICENSE_PREFIX "libavformat license: "

#define PRINT ( ... ) do { if (!f) av_log(avcl, level, __VA_ARGS__); else fprintf(f, __VA_ARGS__); } while(0)

#define PROBE_BUF_MAX (1<<20)

Definition at line 574 of file utils.c.

Referenced by av_probe_input_buffer().

#define PROBE_BUF_MIN 2048

size of probe buffer, for guessing file type from file contents

Definition at line 573 of file utils.c.

Referenced by av_probe_input_buffer().

Function Documentation

static AVPacket* add_to_pktbuf	(	AVPacketList **	packet_buffer,
		AVPacket *	pkt,
		AVPacketList **	plast_pktl
	)			`[static]`

Definition at line 772 of file utils.c.

Referenced by av_read_frame(), av_read_packet(), and avformat_find_stream_info().

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.

Update the entry if the list already contains it.

Parameters:

timestamp

timestamp in the time base of the given stream

Definition at line 1543 of file utils.c.

Referenced by ape_read_header(), asf_build_simple_index(), asf_read_pts(), av_read_frame_internal(), avi_read_idx1(), clean_index(), find_and_decode_index(), flv_read_packet(), gxf_read_index(), matroska_parse_block(), matroska_read_header(), mov_read_trun(), mpc8_parse_seektable(), mpc_read_packet(), mpegps_read_pes_header(), nsv_parse_NSVs_header(), parse_keyframes_index(), pmp_header(), pva_read_header(), read_braindead_odml_indx(), read_header(), read_pakt_chunk(), read_part_of_packet(), rl2_read_header(), rm_read_dts(), rm_read_index(), rm_read_packet(), rpl_read_header(), tta_read_header(), write_packet(), wv_read_packet(), and xwma_read_header().

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:

	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.

Definition at line 352 of file utils.c.

Referenced by dfa_read_packet(), wc3_read_header(), wc3_read_packet(), and wv_read_packet().

void av_close_input_file ( AVFormatContext * s )

Close a media file (but not its codecs).

Parameters:

s

media file handle

Definition at line 2774 of file utils.c.

Referenced by avi_read_close(), build_feed_streams(), build_file_streams(), close_connection(), ff_wms_parse_sdp_a_line(), ffmpeg_exit(), free_variant_list(), http_prepare_data(), main(), open_input_stream(), opt_input_file(), probe_file(), rdt_free_context(), read_ffserver_streams(), read_thread(), sap_read_close(), and uninit().

void av_close_input_stream ( AVFormatContext * s )

Free a AVFormatContext allocated by av_open_input_stream.

Parameters:

s

context to free

Definition at line 2714 of file utils.c.

Referenced by av_close_input_file(), ff_rtsp_close_streams(), and http_receive_data().

enum CodecID av_codec_get_id	(	const AVCodecTag const	tags,
		unsigned int	tag
	)

Definition at line 2267 of file utils.c.

unsigned int av_codec_get_tag	(	const AVCodecTag const	tags,
		enum CodecID	id
	)

Definition at line 2257 of file utils.c.

int av_demuxer_open	(	AVFormatContext *	ic,
		AVFormatParameters *	ap
	)

Definition at line 556 of file utils.c.

Referenced by opt_input_file().

void av_dump_format	(	AVFormatContext *	ic,
		int	index,
		const char *	url,
		int	is_output
	)

Definition at line 3536 of file utils.c.

Referenced by dump_format(), main(), open_input_file(), opt_input_file(), read_thread(), and transcode().

static void av_estimate_timings	(	AVFormatContext *	ic,
		int64_t	old_offset
	)			`[static]`

Definition at line 2113 of file utils.c.

Referenced by avformat_find_stream_info().

static void av_estimate_timings_from_bit_rate ( AVFormatContext * ic ) [static]

Definition at line 1997 of file utils.c.

Referenced by av_estimate_timings().

static void av_estimate_timings_from_pts	(	AVFormatContext *	ic,
		int64_t	old_offset
	)			`[static]`

Definition at line 2034 of file utils.c.

Referenced by av_estimate_timings().

int av_filename_number_test ( const char * filename )

Check whether filename actually is a numbered sequence generator.

Parameters:

filename

possible numbered sequence string

Returns:: 1 if a valid numbered sequence string, 0 otherwise

Definition at line 368 of file utils.c.

Referenced by av_guess_format(), avformat_open_input(), opt_output_file(), and read_probe().

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.

The best stream is determined according to various heuristics as the most likely to be what the user expects. If the decoder parameter is non-NULL, av_find_best_stream will find the default decoder for the stream's codec; streams for which no decoder can be found are ignored.

Parameters:

	ic	media file handle
	type	stream type: video, audio, subtitles, etc.
	wanted_stream_nb	user-requested stream number, or -1 for automatic selection
	related_stream	try to find a stream related (eg. in the same program) to this one, or -1 if none
	decoder_ret	if non-NULL, returns the decoder for the selected stream
	flags	flags; none are currently defined

Returns:: the non-negative stream number in case of success, AVERROR_STREAM_NOT_FOUND if no stream with the requested type could be found, AVERROR_DECODER_NOT_FOUND if streams were found but no decoder

Note:: If av_find_best_stream returns successfully and decoder_ret is not NULL, then *decoder_ret is guaranteed to be set to a valid AVCodec.

Definition at line 2641 of file utils.c.

Referenced by movie_init(), and read_thread().

int av_find_default_stream_index ( AVFormatContext * s )

Definition at line 1418 of file utils.c.

Referenced by av_seek_frame().

AVInputFormat* av_find_input_format ( const char * short_name )

Find AVInputFormat based on the short name of the input format.

Definition at line 291 of file utils.c.

Referenced by http_receive_data(), movie_init(), opt_format(), opt_input_file(), parse_ffconfig(), and sap_read_header().

int av_find_stream_info ( AVFormatContext * ic )

Read packets of a media file to get stream information.

This is useful for file formats with no headers such as MPEG. This function also computes the real framerate in case of MPEG-2 repeat frame mode. The logical file position is not changed by this function; examined packets may be buffered for later processing.

Parameters:

ic

media file handle

Returns:: >=0 if OK, AVERROR_xxx on error

Todo:: Let the user decide somehow what information is needed so that we do not waste time getting stuff the user does not need.

Deprecated:: use avformat_find_stream_info.

Definition at line 2324 of file utils.c.

Referenced by build_file_streams(), main(), movie_init(), open_input_file(), open_input_stream(), opt_input_file(), and read_thread().

static void av_frac_add	(	AVFrac *	f,
		int64_t	incr
	)			`[static]`

Fractional addition to f: f = f + (incr / f->den).

Parameters:

	f	fractional number
	incr	increment, can be positive or negative

Definition at line 100 of file utils.c.

Referenced by compute_pkt_fields2().

static void av_frac_init	(	AVFrac *	f,
		int64_t	val,
		int64_t	num,
		int64_t	den
	)			`[static]`

f = val + (num / den) + 0.5.

'num' is normalized so that it is such as 0 <= num < den.

Parameters:

	f	fractional number
	val	integer value
	num	must be >= 0
	den	must be >= 1

Definition at line 82 of file utils.c.

Referenced by avformat_write_header().

int64_t av_gen_search	(	AVFormatContext *	s,
		int	stream_index,
		int64_t	target_ts,
		int64_t	pos_min,
		int64_t	pos_max,
		int64_t	pos_limit,
		int64_t	ts_min,
		int64_t	ts_max,
		int	flags,
		int64_t *	ts_ret,
		int64_t()(struct AVFormatContext , int, int64_t *, int64_t)	read_timestamp
	)

Perform a binary search using read_timestamp().

This is not supposed to be called directly by a user application, but by demuxers.

Parameters:

	target_ts	target timestamp in the time base of the given stream
	stream_index	stream number

Definition at line 1652 of file utils.c.

Referenced by av_seek_frame_binary(), and read_seek().

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

Return in 'buf' the path with 'd' replaced by a number.

Also handles the '0nd' format where 'n' is the total number of digits and '%'.

Parameters:

	buf	destination buffer
	buf_size	destination buffer size
	path	numbered sequence string
	number	frame number

Returns:: 0 if OK, -1 on format error

Definition at line 3665 of file utils.c.

Referenced by av_filename_number_test(), find_image_range(), and read_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:

	pkt	packet
	size	desired payload size

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

Definition at line 334 of file utils.c.

Referenced by aea_read_packet(), aiff_read_packet(), apc_read_packet(), au_read_packet(), av_append_packet(), bfi_read_packet(), cdata_read_packet(), cin_read_packet(), daud_packet(), dfa_read_packet(), dxa_read_packet(), ea_read_packet(), ff_rm_parse_packet(), ff_rm_retrieve_cache(), film_read_packet(), flv_read_packet(), fourxm_read_packet(), gxf_packet(), idcin_read_packet(), iff_read_packet(), iss_read_packet(), lmlm4_read_packet(), load_ipmovie_packet(), mov_read_packet(), mp3_read_packet(), mpc8_read_packet(), mpegps_read_packet(), msnwc_tcp_read_packet(), mtv_read_packet(), mxf_decrypt_triplet(), mxf_get_d10_aes3_packet(), mxf_read_packet(), nc_read_packet(), nsv_read_chunk(), nuv_packet(), oma_read_packet(), pmp_packet(), pva_read_packet(), qcp_read_packet(), r3d_read_reda(), r3d_read_redv(), raw_read_packet(), rawvideo_read_packet(), read_packet(), rl2_read_packet(), roq_read_packet(), rpl_read_packet(), rso_read_packet(), seq_read_packet(), siff_read_packet(), sol_read_packet(), sox_read_packet(), swf_read_packet(), thp_read_packet(), tmv_read_packet(), tta_read_packet(), txd_read_packet(), vc1t_read_packet(), vid_read_packet(), voc_get_packet(), wc3_read_packet(), wsaud_read_packet(), xa_read_packet(), xwma_read_packet(), yop_read_packet(), and yuv4_read_packet().

int64_t av_gettime ( void )

Get the current time in microseconds.

Definition at line 3633 of file utils.c.

Referenced by applehttp_read(), audio_read_packet(), bktr_getframe(), enqueue_packet(), fbdev_read_packet(), ff_ntp_time(), ff_rtsp_setup_output_streams(), get_external_clock(), get_video_clock(), get_video_frame(), getutime(), grab_read_header(), grab_read_packet(), http_server(), open_input_stream(), output_packet(), parse_playlist(), print_report(), process_callback(), read_data(), read_ffserver_streams(), rtsp_read_packet(), sap_write_header(), sap_write_packet(), sdl_audio_callback(), stream_toggle_pause(), transcode(), video_audio_display(), video_refresh(), x11grab_read_header(), and x11grab_read_packet().

enum CodecID 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.

Definition at line 270 of file utils.c.

Referenced by new_audio_stream(), new_subtitle_stream(), and new_video_stream().

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.

Parameters:

	short_name	if non-NULL checks if short_name matches with the names of the registered formats
	filename	if non-NULL checks if filename terminates with the extensions of the registered formats
	mime_type	if non-NULL checks if mime_type matches with the MIME type of the registered formats

Definition at line 214 of file utils.c.

Referenced by av_guess_format(), avformat_alloc_output_context2(), ff_rtp_chain_mux_open(), ffserver_guess_format(), guess_format(), guess_stream_format(), parse_ffconfig(), and rtp_new_av_stream().

static int av_has_duration ( AVFormatContext * ic ) [static]

Return TRUE if the stream has accurate duration in any stream.

Returns:: TRUE if the stream has accurate duration for at least one component.

Definition at line 1909 of file utils.c.

Referenced by av_estimate_timings().

void av_hex_dump	(	FILE *	f,
		uint8_t *	buf,
		int	size
	)

Send a nice hexadecimal dump of a buffer to the specified file stream.

Parameters:

	f	The file stream pointer where the dump should be sent to.
	buf	buffer
	size	buffer size

See also:: av_hex_dump_log, av_pkt_dump2, av_pkt_dump_log2

Definition at line 3749 of file utils.c.

Referenced by pkt_dump_internal().

void av_hex_dump_log	(	void *	avcl,
		int	level,
		uint8_t *	buf,
		int	size
	)

Send a nice hexadecimal dump of a buffer to the log.

Parameters:

	avcl	A pointer to an arbitrary struct of which the first field is a pointer to an AVClass struct.
	level	The importance level of the message, lower values signifying higher importance.
	buf	buffer
	size	buffer size

See also:: av_hex_dump, av_pkt_dump2, av_pkt_dump_log2

Definition at line 3754 of file utils.c.

AVInputFormat* av_iformat_next ( AVInputFormat * f )

If f is NULL, returns the first registered input format, if f is non-NULL, returns the next registered input format after f or NULL if f is the last one.

Definition at line 131 of file utils.c.

Referenced by av_find_input_format(), av_probe_input_format3(), opt_default(), opt_find(), opt_formats(), and probe().

int av_index_search_timestamp	(	AVStream *	st,
		int64_t	timestamp,
		int	flags
	)

Get the index for a specific timestamp.

Parameters:

flags

if AVSEEK_FLAG_BACKWARD then the returned index will correspond to the timestamp which is <= the requested one, if backward is 0, then it will be >= if AVSEEK_FLAG_ANY seek to any frame, only keyframes otherwise

Returns:: < 0 if no such timestamp could be found

Definition at line 1585 of file utils.c.

Referenced by ape_read_seek(), asf_read_seek(), av_seek_frame_binary(), av_seek_frame_generic(), avi_read_packet(), avi_read_seek(), gxf_seek(), matroska_read_seek(), mov_seek_stream(), mpc8_read_seek(), mpc_read_seek(), nsv_read_seek(), read_packet(), read_seek(), rl2_read_seek(), tta_read_seek(), write_packet(), and wv_read_seek().

static int av_interleave_packet	(	AVFormatContext *	s,
		AVPacket *	out,
		AVPacket *	in,
		int	flush
	)			`[static]`

Interleave an AVPacket correctly so it can be muxed.

Parameters:

	out	the interleaved packet will be output here
	in	the input packet
	flush	1 if no further packets are available as input and all remaining packets should be output

Returns:: 1 if a packet was output, 0 if no packet could be output, < 0 if an error occurred

Definition at line 3332 of file utils.c.

Referenced by av_interleaved_write_frame(), and av_write_trailer().

int av_interleave_packet_per_dts	(	AVFormatContext *	s,
		AVPacket *	out,
		AVPacket *	pkt,
		int	flush
	)

Interleave a packet per dts in an output media file.

Packets with pkt->destruct == av_destruct_packet will be freed inside this function, so they cannot be used after it. Note that calling av_free_packet() on them is still safe.

Parameters:

	s	media file handle
	out	the interleaved packet will be output here
	pkt	the input packet
	flush	1 if no further packets are available as input and all remaining packets should be output

Returns:: 1 if a packet was output, 0 if no packet could be output, < 0 if an error occurred

Definition at line 3293 of file utils.c.

Referenced by av_interleave_packet(), and gxf_interleave_packet().

int av_interleaved_write_frame	(	AVFormatContext *	s,
		AVPacket *	pkt
	)

Write a packet to an output media file ensuring correct interleaving.

The packet must contain one audio or video frame. If the packets are already correctly interleaved, the application should call av_write_frame() instead as it is slightly faster. It is also important to keep in mind that completely non-interleaved input will need huge amounts of memory to interleave with this, so it is preferable to interleave at the demuxer level.

Parameters:

	s	media file handle
	pkt	The packet, which contains the stream_index, buf/buf_size, dts/pts, ...

Returns:: < 0 on error, = 0 if OK, 1 if end of stream wanted

Definition at line 3339 of file utils.c.

Referenced by write_audio_frame(), write_frame(), and write_video_frame().

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.

Parameters:

extensions

a comma-separated list of filename extensions

Definition at line 161 of file utils.c.

Referenced by av_guess_format(), av_probe_input_format3(), http_parse_request(), ipod_get_codec_tag(), mpegts_probe(), and nsv_probe().

AVProgram* av_new_program	(	AVFormatContext *	ac,
		int	id
	)

Definition at line 2842 of file utils.c.

Referenced by pat_cb(), and sdt_cb().

AVStream* av_new_stream	(	AVFormatContext *	s,
		int	id
	)

Add a new stream to a media file.

Can only be called in the read_header() function. If the flag AVFMTCTX_NOHEADER is in the format context, then new streams can be added in read_packet too.

Parameters:

	s	media file handle
	id	file-format-dependent stream ID

Definition at line 2783 of file utils.c.

Referenced by add_audio_stream(), add_dstream(), add_video_stream(), adts_aac_read_header(), aea_read_header(), aiff_read_header(), amr_read_header(), apc_read_header(), ape_read_header(), applehttp_read_header(), asf_read_stream_properties(), au_read_header(), audio_read_header(), avi_read_header(), avisynth_read_header(), avs_read_packet(), bfi_read_header(), cdata_read_header(), cin_read_header(), create_audio_stream(), create_stream(), daud_header(), dc1394_read_header(), decode_main_header(), dfa_read_header(), dshow_add_device(), dv_extract_audio_info(), dv_init_demux(), dxa_read_header(), ea_read_header(), fbdev_read_header(), ff_raw_audio_read_header(), ff_raw_read_header(), ff_raw_video_read_header(), ff_rtp_chain_mux_open(), ffm_read_header(), film_read_header(), flac_read_header(), flic_read_header(), fourxm_read_header(), get_attachment(), get_sindex(), grab_read_header(), idcin_read_header(), iff_read_header(), ipmovie_read_header(), iss_read_header(), lmlm4_read_header(), lxf_read_header(), matroska_read_header(), microdvd_read_header(), mmf_read_header(), mov_read_trak(), mp3_read_header(), mpc8_read_header(), mpc_read_header(), mpegps_read_packet(), mpegts_push_data(), mpegts_read_header(), mpegts_set_stream_info(), msnwc_tcp_read_header(), mtv_read_header(), mxf_parse_structural_metadata(), mxg_read_header(), nc_read_header(), new_audio_stream(), new_data_stream(), new_stream(), new_subtitle_stream(), new_video_stream(), nsv_parse_NSVs_header(), nut_read_header(), nuv_header(), ogg_new_stream(), oma_read_header(), pmp_header(), pmt_cb(), pva_read_header(), qcp_read_header(), r3d_read_red1(), read_desc_chunk(), read_header(), read_packet(), rl2_read_header(), rm_read_header(), rm_read_header_old(), roq_read_header(), roq_read_packet(), rpl_read_header(), rso_read_header(), sap_fetch_packet(), sap_read_header(), seq_read_header(), siff_parse_vbv1(), smacker_read_header(), sol_read_header(), sox_read_header(), spdif_read_packet(), srt_read_header(), str_read_packet(), swf_read_packet(), thp_read_header(), tmv_read_header(), tta_read_header(), txd_read_header(), v4l2_read_header(), vc1t_read_header(), vfw_read_header(), vid_read_header(), vmd_read_header(), voc_read_header(), vqf_read_header(), wc3_read_header(), wsaud_read_header(), wsvqa_read_header(), wv_read_header(), x11grab_read_header(), xa_read_header(), xwma_read_header(), yop_read_header(), and yuv4_read_header().

AVOutputFormat* av_oformat_next ( AVOutputFormat * f )

If f is NULL, returns the first registered output format, if f is non-NULL, returns the next registered output format after f or NULL if f is the last one.

Definition at line 137 of file utils.c.

Referenced by av_guess_format(), opt_default(), opt_find(), opt_formats(), and opt_help().

int av_open_input_file	(	AVFormatContext **	ic_ptr,
		const char *	filename,
		AVInputFormat *	fmt,
		int	buf_size,
		AVFormatParameters *	ap
	)

Open a media file as input.

The codecs are not opened. Only the file header (if present) is read.

Parameters:

	ic_ptr	The opened media file handle is put here.
	filename	filename to open
	fmt	If non-NULL, force the file format to use.
	buf_size	optional buffer size (zero if default is OK)
	ap	Additional parameters needed when opening the file (NULL if default).

Returns:: 0 if OK, AVERROR_xxx otherwise

Deprecated:: use avformat_open_input instead.

Definition at line 650 of file utils.c.

Referenced by main(), opt_input_file(), and read_ffserver_streams().

int av_open_input_stream	(	AVFormatContext **	ic_ptr,
		AVIOContext *	pb,
		const char *	filename,
		AVInputFormat *	fmt,
		AVFormatParameters *	ap
	)

Open a media file from an IO stream.

Allocate all the structures needed to read an input stream.

'fmt' must be specified.

Definition at line 511 of file utils.c.

void av_pkt_dump	(	FILE *	f,
		AVPacket *	pkt,
		int	dump_payload
	)

Definition at line 3786 of file utils.c.

void av_pkt_dump2	(	FILE *	f,
		AVPacket *	pkt,
		int	dump_payload,
		AVStream *	st
	)

Send a nice dump of a packet to the specified file stream.

Parameters:

	f	The file stream pointer where the dump should be sent to.
	pkt	packet to dump
	dump_payload	True if the payload must be displayed, too.
	st	AVStream that the packet belongs to

Definition at line 3793 of file utils.c.

void av_pkt_dump_log	(	void *	avcl,
		int	level,
		AVPacket *	pkt,
		int	dump_payload
	)

Definition at line 3799 of file utils.c.

void av_pkt_dump_log2	(	void *	avcl,
		int	level,
		AVPacket *	pkt,
		int	dump_payload,
		AVStream *	st
	)

Send a nice dump of a packet to the log.

Parameters:

	avcl	A pointer to an arbitrary struct of which the first field is a pointer to an AVClass struct.
	level	The importance level of the message, lower values signifying higher importance.
	pkt	packet to dump
	dump_payload	True if the payload must be displayed, too.
	st	AVStream that the packet belongs to

Definition at line 3806 of file utils.c.

Referenced by transcode().

int av_probe_input_buffer	(	AVIOContext *	pb,
		AVInputFormat **	fmt,
		const char *	filename,
		void *	logctx,
		unsigned int	offset,
		unsigned int	max_probe_size
	)

Probe a bytestream to determine the input format.

Each time a probe returns with a score that is too low, the probe buffer size is increased and another attempt is made. When the maximum probe size is reached, the input format with the highest score is returned.

Parameters:

	pb	the bytestream to probe
	fmt	the input format is put here
	filename	the filename of the stream
	logctx	the log context
	offset	the offset within the bytestream to probe from
	max_probe_size	the maximum probe buffer size (zero for default)

Returns:: 0 in case of success, a negative value corresponding to an AVERROR code otherwise

Definition at line 576 of file utils.c.

Referenced by applehttp_read_header(), and init_input().

AVInputFormat* av_probe_input_format	(	AVProbeData *	pd,
		int	is_opened
	)

Guess the file format.

Parameters:

is_opened

Whether the file is already opened; determines whether demuxers with or without AVFMT_NOFILE are probed.

Definition at line 423 of file utils.c.

Referenced by init_input().

AVInputFormat* av_probe_input_format2	(	AVProbeData *	pd,
		int	is_opened,
		int *	score_max
	)

Guess the file format.

Parameters:

	is_opened	Whether the file is already opened; determines whether demuxers with or without AVFMT_NOFILE are probed.
	score_max	A probe score larger that this is required to accept a detection, the variable is set to the actual detection score afterwards. If the score is <= AVPROBE_SCORE_MAX / 4 it is recommended to retry with a larger probe buffer.

Definition at line 412 of file utils.c.

Referenced by av_probe_input_buffer(), av_probe_input_format(), and read_gab2_sub().

AVInputFormat* av_probe_input_format3	(	AVProbeData *	pd,
		int	is_opened,
		int *	score_ret
	)

Guess the file format.

Parameters:

	is_opened	Whether the file is already opened; determines whether demuxers with or without AVFMT_NOFILE are probed.
	score_ret	The score of the best detection.

Definition at line 374 of file utils.c.

Referenced by av_probe_input_format2(), and set_codec_from_probe_data().

int av_read_frame	(	AVFormatContext *	s,
		AVPacket *	pkt
	)

Return the next frame of a stream.

This function returns what is stored in the file, and does not validate that what is there are valid frames for the decoder. It will split what is stored in the file into frames and return one for each call. It will not omit invalid data between valid frames so as to give the decoder the maximum information possible for decoding.

The returned packet is valid until the next av_read_frame() or until av_close_input_file() and must be freed with av_free_packet. For video, the packet contains exactly one frame. For audio, it contains an integer number of frames if each frame has a known fixed size (e.g. PCM or ADPCM data). If the audio frames have a variable size (e.g. MPEG audio), then it contains one frame.

pkt->pts, pkt->dts and pkt->duration are always set to correct values in AVStream.time_base units (and guessed if the format cannot provide them). pkt->pts can be AV_NOPTS_VALUE if the video format has B-frames, so it is better to rely on pkt->dts if you do not decompress the payload.

Returns:: 0 if OK, < 0 on error or end of file

Definition at line 1337 of file utils.c.

Referenced by applehttp_read_packet(), asf_read_pts(), av_seek_frame_generic(), http_prepare_data(), main(), movie_get_frame(), mpc_read_seek(), read_thread(), sap_fetch_packet(), search_hi_lo_keyframes(), show_packets(), transcode(), and wv_read_seek().

static int av_read_frame_internal	(	AVFormatContext *	s,
		AVPacket *	pkt
	)			`[static]`

Definition at line 1194 of file utils.c.

Referenced by av_read_frame(), and avformat_find_stream_info().

int av_read_packet	(	AVFormatContext *	s,
		AVPacket *	pkt
	)

Read a transport packet from a media file.

This function is obsolete and should never be used. Use av_read_frame() instead.

Parameters:

	s	media file handle
	pkt	is filled

Returns:: 0 if OK, AVERROR_xxx on error

Definition at line 789 of file utils.c.

Referenced by asfrtp_parse_packet(), av_estimate_timings_from_pts(), av_read_frame_internal(), extract_mpeg4_header(), get_subtitle_pkt(), read_gab2_sub(), and seek_subtitle().

int av_read_pause ( AVFormatContext * s )

Pause a network-based stream (e.g.

RTSP stream).

Use av_read_play() to resume it.

Definition at line 2705 of file utils.c.

Referenced by read_thread().

int av_read_play ( AVFormatContext * s )

Start playing a network-based stream (e.g.

RTSP stream) at the current position.

Definition at line 2696 of file utils.c.

Referenced by read_thread().

void av_register_input_format ( AVInputFormat * format )

Definition at line 143 of file utils.c.

void av_register_output_format ( AVOutputFormat * format )

Definition at line 152 of file utils.c.

int av_seek_frame	(	AVFormatContext *	s,
		int	stream_index,
		int64_t	timestamp,
		int	flags
	)

Seek to the keyframe at timestamp.

'timestamp' in 'stream_index'.

Parameters:

	stream_index	If stream_index is (-1), a default stream is selected, and timestamp is automatically converted from AV_TIME_BASE units to the stream specific time_base.
	timestamp	Timestamp in AVStream.time_base units or, if no stream is specified, in AV_TIME_BASE units.
	flags	flags which select direction and seeking mode

Returns:: >= 0 on success

Definition at line 1843 of file utils.c.

Referenced by avformat_seek_file(), movie_init(), open_input_stream(), and opt_input_file().

int av_seek_frame_binary	(	AVFormatContext *	s,
		int	stream_index,
		int64_t	target_ts,
		int	flags
	)

Perform a binary search using av_index_search_timestamp() and AVInputFormat.read_timestamp().

This is not supposed to be called directly by a user application, but by demuxers.

Parameters:

	target_ts	target timestamp in the time base of the given stream
	stream_index	stream number

Definition at line 1592 of file utils.c.

Referenced by asf_read_seek(), av_seek_frame(), ogg_read_seek(), and read_seek().

static int av_seek_frame_byte	(	AVFormatContext *	s,
		int	stream_index,
		int64_t	pos,
		int	flags
	)			`[static]`

Definition at line 1758 of file utils.c.

Referenced by av_seek_frame().

static int av_seek_frame_generic	(	AVFormatContext *	s,
		int	stream_index,
		int64_t	timestamp,
		int	flags
	)			`[static]`

Definition at line 1783 of file utils.c.

Referenced by av_seek_frame().

int av_set_parameters	(	AVFormatContext *	s,
		AVFormatParameters *	ap
	)

media file output

Deprecated:: pass the options to avformat_write_header directly.

Definition at line 2896 of file utils.c.

Referenced by build_feed_streams(), ff_rtp_chain_mux_open(), and opt_output_file().

void av_set_pts_info	(	AVStream *	s,
		int	pts_wrap_bits,
		unsigned int	pts_num,
		unsigned int	pts_den
	)

Set the pts for a given stream.

If the new values would be invalid (<= 0), it leaves the AVStream unchanged.

Parameters:

	s	stream
	pts_wrap_bits	number of bits effectively used by the pts (used for wrap control, 33 is the value for MPEG)
	pts_num	numerator to convert to seconds (MPEG: 1)
	pts_den	denominator to convert to seconds (MPEG: 90000)

Definition at line 3940 of file utils.c.

Referenced by add_av_stream1(), adts_aac_read_header(), aiff_read_header(), aiff_write_header(), amr_read_header(), ape_read_header(), asf_read_stream_properties(), asf_write_header1(), asfrtp_parse_sdp_line(), au_read_header(), audio_read_header(), av_new_stream(), avi_read_header(), avi_write_header(), avisynth_read_header(), bfi_read_header(), cdata_read_header(), celt_header(), cin_read_header(), create_audio_stream(), create_stream(), dc1394_read_header(), decode_stream_header(), dfa_read_header(), dirac_header(), dshow_add_device(), dv_extract_audio_info(), dv_extract_video_info(), dxa_read_header(), ea_read_header(), fbdev_read_header(), ff_raw_read_header(), ff_raw_video_read_header(), ff_rm_read_mdpr_codecdata(), ffm_read_header(), ffm_write_header(), film_read_header(), flac_header(), flac_read_header(), flic_read_header(), flv_write_header(), fourxm_read_header(), get_packet_header(), grab_read_header(), gxf_header(), gxf_write_header(), idcin_read_header(), iff_read_header(), ipmovie_read_header(), iss_read_header(), lmlm4_read_header(), lxf_read_header(), matroska_read_header(), microdvd_read_header(), mkv_write_tracks(), mmf_read_header(), mov_read_trak(), mov_write_header(), mp3_read_header(), mpc8_read_header(), mpc_read_header(), mpeg_mux_init(), mpegts_read_header(), mpegts_set_stream_info(), mpegts_write_header(), msnwc_tcp_read_header(), mtv_read_header(), mxf_parse_structural_metadata(), mxf_write_header(), mxg_read_header(), nc_read_header(), new_stream(), nsv_parse_NSVs_header(), nut_read_header(), nuv_header(), ogg_new_stream(), ogg_write_header(), ogm_header(), old_dirac_header(), oma_read_header(), pmp_header(), pva_read_header(), qt_rtp_parse_packet(), r3d_read_red1(), read_gab2_sub(), read_header(), rl2_read_header(), roq_read_header(), roq_read_packet(), rpl_read_header(), rso_read_header(), seq_read_header(), siff_parse_vbv1(), skeleton_header(), smacker_read_header(), sol_read_header(), sox_read_header(), speex_header(), srt_read_header(), str_read_packet(), swf_read_packet(), theora_header(), thp_read_header(), tmv_read_header(), tta_read_header(), v4l2_read_header(), vc1t_read_header(), vc1test_write_header(), vfw_read_header(), vid_read_header(), vmd_read_header(), vorbis_header(), vqf_read_header(), wc3_read_header(), write_header(), wsaud_read_header(), wsvqa_read_header(), wv_read_header(), x11grab_read_header(), xa_read_header(), xwma_read_header(), yop_read_header(), and yuv4_read_header().

void av_update_cur_dts	(	AVFormatContext *	s,
		AVStream *	ref_st,
		int64_t	timestamp
	)

Update cur_dts of all streams based on the given timestamp and AVStream.

Stream ref_st unchanged, others set cur_dts in their native time base. Only needed for timestamp wrapping or if (dts not set and pts!=dts).

Parameters:

	timestamp	new dts expressed in time_base of param ref_st
	ref_st	reference stream giving time_base of param timestamp

Definition at line 1472 of file utils.c.

Referenced by av_seek_frame_binary(), av_seek_frame_byte(), av_seek_frame_generic(), matroska_read_seek(), and mxf_read_seek().

static void av_update_stream_timings ( AVFormatContext * ic ) [static]

Estimate the stream timings from the one of each components.

Also computes the global bitrate if possible.

Definition at line 1927 of file utils.c.

Referenced by av_estimate_timings(), and fill_all_stream_timings().

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.

The pointers to buffers for storing individual components may be null, in order to ignore that component. Buffers for components not found are set to empty strings. If the port is not found, it is set to a negative value.

Parameters:

	proto	the buffer for the protocol
	proto_size	the size of the proto buffer
	authorization	the buffer for the authorization
	authorization_size	the size of the authorization buffer
	hostname	the buffer for the host name
	hostname_size	the size of the hostname buffer
	port_ptr	a pointer to store the port number in
	path	the buffer for the path
	path_size	the size of the path buffer
	url	the URL to split

Definition at line 3830 of file utils.c.

Referenced by ff_udp_set_remote_url(), ff_url_split(), find_rtp_session_with_url(), gopher_open(), http_open_cnx(), mms_open(), mmsh_open(), resetup_tcp(), rtmp_open(), rtp_open(), rtp_set_remote_url(), rtsp_cmd_describe(), rtsp_cmd_setup(), sap_read_header(), sap_write_header(), tcp_open(), and udp_open().

int av_write_frame	(	AVFormatContext *	s,
		AVPacket *	pkt
	)

Write a packet to an output media file.

The packet shall contain one audio or video frame. The packet must be correctly interleaved according to the container specification, if not then av_interleaved_write_frame must be used.

Parameters:

	s	media file handle
	pkt	The packet, which contains the stream_index, buf/buf_size, dts/pts, ...

Returns:: < 0 on error, = 0 if OK, 1 if end of stream wanted

Definition at line 3232 of file utils.c.

Referenced by ff_write_chained(), and http_prepare_data().

int av_write_header ( AVFormatContext * s )

Allocate the stream private data and write the stream header to an output media file.

Note:: : this sets stream time-bases, if possible to stream->codec->time_base but for some formats it might also be some other time base

Parameters:

s

media file handle

Returns:: 0 if OK, AVERROR_xxx on error

Deprecated:: use avformat_write_header.

Definition at line 3010 of file utils.c.

Referenced by build_feed_streams(), main(), and transcode().

int av_write_trailer ( AVFormatContext * s )

Write the stream trailer to an output media file and free the file private data.

May only be called after a successful call to av_write_header.

Parameters:

s

media file handle

Returns:: 0 if OK, AVERROR_xxx on error

Definition at line 3373 of file utils.c.

Referenced by close_connection(), ff_mov_close_hinting(), ff_rtsp_undo_setup(), http_prepare_data(), main(), and sap_write_close().

AVFormatContext* avformat_alloc_output_context	(	const char *	format,
		AVOutputFormat *	oformat,
		const char *	filename
	)

Deprecated:: deprecated in favor of avformat_alloc_output_context2()

Definition at line 2967 of file utils.c.

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

Definition at line 2913 of file utils.c.

Referenced by avformat_alloc_output_context(), main(), and opt_output_file().

const char* avformat_configuration ( void )

Return the libavformat build-time configuration.

Definition at line 59 of file utils.c.

int avformat_find_stream_info	(	AVFormatContext *	ic,
		AVDictionary **	options
	)

Read packets of a media file to get stream information.

This is useful for file formats with no headers such as MPEG. This function also computes the real framerate in case of MPEG-2 repeat frame mode. The logical file position is not changed by this function; examined packets may be buffered for later processing.

Parameters:

	ic	media file handle
	options	If non-NULL, an ic.nb_streams long array of pointers to dictionaries, where i-th member contains options for codec corresponding to i-th stream. On return each dictionary will be filled with options that were not found.

Returns:: >=0 if OK, AVERROR_xxx on error

Note:: this function isn't guaranteed to open all the codecs, so options being non-empty at return is a perfectly normal behavior.

Todo:: Let the user decide somehow what information is needed so that we do not waste time getting stuff the user does not need.

Definition at line 2330 of file utils.c.

Referenced by av_find_stream_info().

void avformat_free_context ( AVFormatContext * s )

Free an AVFormatContext and all its streams.

Parameters:

s

context to free

Definition at line 2722 of file utils.c.

Referenced by av_close_input_stream(), avformat_alloc_output_context2(), avformat_open_input(), ff_mov_close_hinting(), ff_rtp_chain_mux_open(), ff_rtsp_undo_setup(), ffmpeg_exit(), main(), opt_input_file(), and sap_write_close().

const char* avformat_license ( void )

Return the libavformat license.

Definition at line 64 of file utils.c.

int avformat_open_input	(	AVFormatContext **	ps,
		const char *	filename,
		AVInputFormat *	fmt,
		AVDictionary **	options
	)

Open an input stream and read the header.

The codecs are not opened. The stream must be closed with av_close_input_file().

Parameters:

	ps	Pointer to user-supplied AVFormatContext (allocated by avformat_alloc_context). May be a pointer to NULL, in which case an AVFormatContext is allocated by this function and written into ps. Note that a user-supplied AVFormatContext will be freed on failure.
	filename	Name of the stream to open.
	fmt	If non-NULL, this parameter forces a specific input format. Otherwise the format is autodetected.
	options	A dictionary filled with AVFormatContext and demuxer-private options. On return this parameter will be destroyed and replaced with a dict containing options that were not found. May be NULL.

Returns:: 0 on success, a negative AVERROR on failure.

Note:: If you want to use custom IO, preallocate the format context and set its pb field.

Definition at line 695 of file utils.c.

Referenced by applehttp_read_header(), av_open_input_file(), av_open_input_stream(), build_feed_streams(), build_file_streams(), ff_wms_parse_sdp_a_line(), http_receive_data(), main(), movie_init(), open_input_file(), open_input_stream(), rdt_new_context(), read_gab2_sub(), read_thread(), and sap_read_header().

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.

Seeking will be done so that the point from which all active streams can be presented successfully will be closest to ts and within min/max_ts. Active streams are all streams that have AVStream.discard < AVDISCARD_ALL.

If flags contain AVSEEK_FLAG_BYTE, then all timestamps are in bytes and are the file position (this may not be supported by all demuxers). If flags contain AVSEEK_FLAG_FRAME, then all timestamps are in frames in the stream with stream_index (this may not be supported by all demuxers). Otherwise all timestamps are in units of the stream selected by stream_index or if stream_index is -1, in AV_TIME_BASE units. If flags contain AVSEEK_FLAG_ANY, then non-keyframes are treated as keyframes (this may not be supported by all demuxers).

Parameters:

	stream_index	index of the stream which is used as time base reference
	min_ts	smallest acceptable timestamp
	ts	target timestamp
	max_ts	largest acceptable timestamp
	flags	flags

Returns:: >=0 on success, error code otherwise

Note:: This is part of the new seek API which is still under construction. Thus do not use this yet. It may change at any time, do not expect ABI compatibility yet!

Definition at line 1880 of file utils.c.

Referenced by main(), read_thread(), and seek_subtitle().

unsigned avformat_version ( void )

Return the LIBAVFORMAT_VERSION_INT constant.

Definition at line 54 of file utils.c.

int avformat_write_header	(	AVFormatContext *	s,
		AVDictionary **	options
	)

Allocate the stream private data and write the stream header to an output media file.

Parameters:

	s	Media file handle, must be allocated with avformat_alloc_context(). Its oformat field must be set to the desired output format; Its pb field must be set to an already openened AVIOContext.
	options	An AVDictionary filled with AVFormatContext and muxer-private options. On return this parameter will be destroyed and replaced with a dict containing options that were not found. May be NULL.

Returns:: 0 on success, negative AVERROR on failure.

See also:: av_opt_find, av_dict_set, avio_open, av_oformat_next.

Definition at line 3016 of file utils.c.

Referenced by av_write_header(), ff_rtp_chain_mux_open(), http_prepare_data(), and rtp_new_av_stream().

static void compute_chapters_end ( AVFormatContext * s ) [static]

Definition at line 2277 of file utils.c.

Referenced by avformat_find_stream_info().

static void compute_frame_duration	(	int *	pnum,
		int *	pden,
		AVStream *	st,
		AVCodecParserContext *	pc,
		AVPacket *	pkt
	)			`[static]`

Return the frame duration in seconds.

Return 0 if not available.

Definition at line 904 of file utils.c.

Referenced by compute_pkt_fields(), and compute_pkt_fields2().

static void compute_pkt_fields	(	AVFormatContext *	s,
		AVStream *	st,
		AVCodecParserContext *	pc,
		AVPacket *	pkt
	)			`[static]`

Definition at line 1030 of file utils.c.

Referenced by av_read_frame_internal().

static int compute_pkt_fields2	(	AVFormatContext *	s,
		AVStream *	st,
		AVPacket *	pkt
	)			`[static]`

Definition at line 3157 of file utils.c.

Referenced by av_interleaved_write_frame(), and av_write_frame().

static AVDictionary* convert_format_parameters ( AVFormatParameters * ap ) [static]

Definition at line 465 of file utils.c.

Referenced by av_open_input_file(), and av_open_input_stream().

void dump_format	(	AVFormatContext *	ic,
		int	index,
		const char *	url,
		int	is_output
	)

Deprecated:: Deprecated in favor of av_dump_format().

Definition at line 3527 of file utils.c.

Referenced by transcode().

static void dump_metadata	(	void *	ctx,
		AVDictionary *	m,
		const char *	indent
	)			`[static]`

Definition at line 3445 of file utils.c.

Referenced by av_dump_format(), and dump_stream_format().

static void dump_stream_format	(	AVFormatContext *	ic,
		int	i,
		int	index,
		int	is_output
	)			`[static]`

Definition at line 3464 of file utils.c.

Referenced by av_dump_format().

int ff_add_index_entry	(	AVIndexEntry **	index_entries,
		int *	nb_index_entries,
		unsigned int *	index_entries_allocated_size,
		int64_t	pos,
		int64_t	timestamp,
		int	size,
		int	distance,
		int	flags
	)

Internal version of av_add_index_entry.

Definition at line 1497 of file utils.c.

Referenced by av_add_index_entry(), and read_header().

enum CodecID ff_codec_get_id	(	const AVCodecTag *	tags,
		unsigned int	tag
	)

unsigned int ff_codec_get_tag	(	const AVCodecTag *	tags,
		enum CodecID	id
	)

Definition at line 2233 of file utils.c.

Referenced by av_codec_get_tag(), caf_write_header(), gxf_write_header(), ipod_get_codec_tag(), mkv_write_codecprivate(), mkv_write_tracks(), mov_find_codec_tag(), mov_get_codec_tag(), mov_write_esds_tag(), mp4_get_codec_tag(), and swf_write_video().

char* ff_data_to_hex	(	char *	buff,
		const uint8_t *	src,
		int	s,
		int	lowercase
	)

Definition at line 3891 of file utils.c.

Referenced by ff_rdt_calc_response_and_checksum(), make_digest_auth(), and open_input().

int ff_find_stream_index	(	AVFormatContext *	s,
		int	id
	)

Find stream index based on format-specific stream ID.

Returns:: stream index, or < 0 on error

Definition at line 4075 of file utils.c.

Referenced by get_sindex(), and parse_chunks().

int ff_hex_to_data	(	uint8_t *	data,
		const char *	p
	)

Parse a string of hexadecimal strings.

Any space between the hexadecimal digits is ignored.

Parameters:

	data	if non-null, the parsed data is written to this pointer
	p	the string to parse

Returns:: the number of bytes written (or to be written, if data is null)

Definition at line 3912 of file utils.c.

Referenced by parse_fmtp_config(), and parse_playlist().

int ff_index_search_timestamp	(	const AVIndexEntry *	entries,
		int	nb_entries,
		int64_t	wanted_timestamp,
		int	flags
	)

Internal version of av_index_search_timestamp.

Definition at line 1551 of file utils.c.

Referenced by av_index_search_timestamp(), ff_add_index_entry(), and read_seek().

void ff_interleave_add_packet	(	AVFormatContext *	s,
		AVPacket *	pkt,
		int()(AVFormatContext , AVPacket , AVPacket )	compare
	)

Add packet to AVFormatContext->packet_buffer list, determining its interleaved position using compare() function argument.

Definition at line 3245 of file utils.c.

Referenced by av_interleave_packet_per_dts(), and ff_audio_rechunk_interleave().

static int ff_interleave_compare_dts	(	AVFormatContext *	s,
		AVPacket *	next,
		AVPacket *	pkt
	)			`[static]`

Definition at line 3281 of file utils.c.

Referenced by av_interleave_packet_per_dts().

void ff_make_absolute_url	(	char *	buf,
		int	size,
		const char *	base,
		const char *	rel
	)

Definition at line 4085 of file utils.c.

Referenced by new_variant(), and parse_playlist().

AVChapter* ff_new_chapter	(	AVFormatContext *	s,
		int	id,
		AVRational	time_base,
		int64_t	start,
		int64_t	end,
		const char *	title
	)

Add a new chapter.

Parameters:

	s	media file handle
	id	unique ID for this chapter
	start	chapter start time in time_base units
	end	chapter end time in time_base units
	title	chapter title

Returns:: AVChapter or NULL on error

Definition at line 2865 of file utils.c.

Referenced by asf_read_marker(), decode_info_header(), matroska_read_header(), mov_read_chapters(), mov_read_chpl(), ogm_chapter(), and read_chapter().

uint64_t ff_ntp_time ( void )

Get the current time since NTP epoch in microseconds.

Definition at line 3640 of file utils.c.

Referenced by rtp_write_header(), and rtp_write_packet().

void ff_parse_key_value	(	const char *	str,
		ff_parse_key_val_cb	callback_get_buf,
		void *	context
	)

Parse a string with comma-separated key=value pairs.

The value strings may be quoted and may contain escaped characters within quoted strings.

Parameters:

	str	the string to parse
	callback_get_buf	function that returns where to store the unescaped value string.
	context	the opaque context pointer to pass to callback_get_buf

Definition at line 4021 of file utils.c.

Referenced by ff_http_auth_handle_header(), and parse_playlist().

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

Definition at line 3410 of file utils.c.

Referenced by pmt_cb().

void ff_read_frame_flush ( AVFormatContext * s )

Flush the frame reader.

Definition at line 1440 of file utils.c.

Referenced by av_seek_frame(), av_seek_frame_generic(), avformat_seek_file(), ff_restore_parser_state(), and search_hi_lo_keyframes().

void ff_reduce_index	(	AVFormatContext *	s,
		int	stream_index
	)

Ensure the index uses less memory than the maximum specified in AVFormatContext.max_index_size by discarding entries if it grows too large.

Definition at line 1484 of file utils.c.

Referenced by av_read_frame_internal(), and mpegps_read_pes_header().

int ff_url_join	(	char *	str,
		int	size,
		const char *	proto,
		const char *	authorization,
		const char *	hostname,
		int	port,
		const char *	fmt,
			...
	)

Assemble a URL string from components.

This is the reverse operation of av_url_split.

Note, this requires networking to be initialized, so the caller must ensure ff_network_init has been called.

See also:: av_url_split

Parameters:

	str	the buffer to fill with the url
	size	the size of the str buffer
	proto	the protocol identifier, if null, the separator after the identifier is left out, too
	authorization	an optional authorization string, may be null. An empty string is treated the same as a null string.
	hostname	the host name string
	port	the port number, left out from the string if negative
	fmt	a generic format string for everything to add after the host/port, may be null

Returns:: the number of characters written to the destination buffer

Definition at line 3958 of file utils.c.

Referenced by build_udp_url(), ff_rtsp_setup_output_streams(), gen_connect(), gopher_open(), http_open_cnx(), mms_open(), mmsh_open(), rtmp_open(), rtp_set_remote_url(), sap_read_header(), and sap_write_header().

attribute_deprecated void ff_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
	)

Deprecated:: use av_url_split() instead

Definition at line 3814 of file utils.c.

int ff_write_chained	(	AVFormatContext *	dst,
		int	dst_stream,
		AVPacket *	pkt,
		AVFormatContext *	src
	)

Write a packet to another muxer than the one the user originally intended.

Useful when chaining muxers, where one muxer internally writes a received packet to another muxer.

Parameters:

	dst	the muxer to write the packet to
	dst_stream	the stream index within dst to write the packet to
	pkt	the packet to be written
	src	the muxer the packet originally was intended for

Returns:: the value av_write_frame returned

Definition at line 4003 of file utils.c.

Referenced by ff_mov_add_hinted_packet(), rtsp_write_packet(), and sap_write_packet().

static void fill_all_stream_timings ( AVFormatContext * ic ) [static]

Definition at line 1980 of file utils.c.

Referenced by av_estimate_timings(), and av_estimate_timings_from_pts().

int find_info_tag	(	char *	arg,
		int	arg_size,
		const char *	tag1,
		const char *	info
	)

Deprecated:: use av_find_info_tag in libavutil instead.

Definition at line 3659 of file utils.c.

static AVProgram* find_program_from_stream	(	AVFormatContext *	ic,
		int	s
	)			`[static]`

Definition at line 2630 of file utils.c.

Referenced by av_find_best_stream().

static void flush_packet_queue ( AVFormatContext * s ) [static]

Definition at line 1392 of file utils.c.

Referenced by av_close_input_stream(), av_estimate_timings_from_pts(), and ff_read_frame_flush().

static int get_audio_frame_size	(	AVCodecContext *	enc,
		int	size
	)			`[static]`

Get the number of samples of an audio frame.

Return -1 on error.

Definition at line 874 of file utils.c.

Referenced by compute_frame_duration(), and compute_pkt_fields2().

static int get_std_framerate ( int i ) [static]

Definition at line 2298 of file utils.c.

Referenced by avformat_find_stream_info().

AVOutputFormat* guess_format	(	const char *	short_name,
		const char *	filename,
		const char *	mime_type
	)

Deprecated:: Use av_guess_format() instead.

Definition at line 207 of file utils.c.

AVOutputFormat* guess_stream_format	(	const char *	short_name,
		const char *	filename,
		const char *	mime_type
	)

Definition at line 250 of file utils.c.

static int has_codec_parameters ( AVCodecContext * enc ) [static]

Definition at line 2161 of file utils.c.

Referenced by avformat_find_stream_info(), and try_decode_frame().

static int has_decode_delay_been_guessed ( AVStream * st ) [static]

Definition at line 2187 of file utils.c.

Referenced by avformat_find_stream_info(), and try_decode_frame().

static void hex_dump_internal	(	void *	avcl,
		FILE *	f,
		int	level,
		uint8_t *	buf,
		int	size
	)			`[static]`

Definition at line 3720 of file utils.c.

Referenced by av_hex_dump(), and av_hex_dump_log().

static int init_input	(	AVFormatContext *	s,
		const char *	filename
	)			`[static]`

Definition at line 669 of file utils.c.

Referenced by avformat_open_input().

static int is_intra_only ( AVCodecContext * enc ) [static]

Definition at line 941 of file utils.c.

Referenced by compute_pkt_fields().

static int match_format	(	const char *	name,
		const char *	names
	)			`[static]`

Definition at line 188 of file utils.c.

Referenced by av_find_input_format().

int64_t parse_date	(	const char *	datestr,
		int	duration
	)

Parse datestr and return a corresponding number of microseconds.

Parameters:

datestr

String representing a date or a duration. See av_parse_time() for the syntax of the provided string.

Deprecated:: in favor of av_parse_time()

Definition at line 3648 of file utils.c.

int parse_frame_rate	(	int *	frame_rate,
		int *	frame_rate_base,
		const char *	arg
	)

Convert framerate from a string to a fraction.

Deprecated:: Use av_parse_video_frame_rate instead.

Definition at line 3623 of file utils.c.

int parse_image_size	(	int *	width_ptr,
		int *	height_ptr,
		const char *	str
	)

Parse width and height out of string str.

Deprecated:: Use av_parse_video_frame_size instead.

Definition at line 3618 of file utils.c.

static void pkt_dump_internal	(	void *	avcl,
		FILE *	f,
		int	level,
		AVPacket *	pkt,
		int	dump_payload,
		AVRational	time_base
	)			`[static]`

Definition at line 3759 of file utils.c.

Referenced by av_pkt_dump(), av_pkt_dump2(), av_pkt_dump_log(), and av_pkt_dump_log2().

static void print_fps	(	double	d,
		const char *	postfix
	)			`[static]`

Definition at line 3438 of file utils.c.

Referenced by dump_stream_format().

static int set_codec_from_probe_data	(	AVFormatContext *	s,
		AVStream *	st,
		AVProbeData *	pd
	)			`[static]`

Definition at line 428 of file utils.c.

Referenced by av_read_packet().

static int tb_unreliable ( AVCodecContext * c ) [static]

Definition at line 2311 of file utils.c.

Referenced by avformat_find_stream_info().

static int try_decode_frame	(	AVStream *	st,
		AVPacket *	avpkt,
		AVDictionary **	options
	)			`[static]`

Definition at line 2193 of file utils.c.

Referenced by avformat_find_stream_info().

static void update_initial_durations	(	AVFormatContext *	s,
		AVStream *	st,
		AVPacket *	pkt
	)			`[static]`

Definition at line 994 of file utils.c.

Referenced by compute_pkt_fields().

static void update_initial_timestamps	(	AVFormatContext *	s,
		int	stream_index,
		int64_t	dts,
		int64_t	pts
	)			`[static]`

Definition at line 965 of file utils.c.

Referenced by compute_pkt_fields().

static int validate_codec_tag	(	AVFormatContext *	s,
		AVStream *	st
	)			`[static]`

Check that tag + id is in the table If neither is in the table -> OK If tag is in the table with another id -> FAIL If id is in the table with another tag -> FAIL unless strict < normal

Definition at line 2976 of file utils.c.

Referenced by avformat_write_header().

Variable Documentation

AVInputFormat* first_iformat = NULL

head of registered input format linked list

Definition at line 124 of file utils.c.

AVOutputFormat* first_oformat = NULL

head of registered output format linked list

Definition at line 129 of file utils.c.


Defines
#define	LICENSE_PREFIX "libavformat license: "
#define	PROBE_BUF_MIN 2048
	size of probe buffer, for guessing file type from file contents
#define	PROBE_BUF_MAX (1<<20)
#define	DURATION_MAX_READ_SIZE 250000
#define	DURATION_MAX_RETRY 3
#define	PRINT(...) do { if (!f) av_log(avcl, level, __VA_ARGS__); else fprintf(f, __VA_ARGS__); } while(0)
#define	PRINT(...) do { if (!f) av_log(avcl, level, __VA_ARGS__); else fprintf(f, __VA_ARGS__); } while(0)
Functions
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.
static void	av_frac_init (AVFrac *f, int64_t val, int64_t num, int64_t den)
	f = val + (num / den) + 0.5.
static void	av_frac_add (AVFrac *f, int64_t incr)
	Fractional addition to f: f = f + (incr / f->den).
AVInputFormat *	av_iformat_next (AVInputFormat *f)
	If f is NULL, returns the first registered input format, if f is non-NULL, returns the next registered input format after f or NULL if f is the last one.
AVOutputFormat *	av_oformat_next (AVOutputFormat *f)
	If f is NULL, returns the first registered output format, if f is non-NULL, returns the next registered output format after f or NULL if f is the last one.
void	av_register_input_format (AVInputFormat *format)
void	av_register_output_format (AVOutputFormat *format)
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.
static int	match_format (const char name, const char names)
AVOutputFormat *	guess_format (const char short_name, const char filename, const char *mime_type)
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.
AVOutputFormat *	guess_stream_format (const char short_name, const char filename, const char *mime_type)
enum CodecID	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.
AVInputFormat *	av_find_input_format (const char *short_name)
	Find AVInputFormat based on the short name of the input format.
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.
int	av_append_packet (AVIOContext s, AVPacket pkt, int size)
	Read data and append it to the current content of the AVPacket.
int	av_filename_number_test (const char *filename)
	Check whether filename actually is a numbered sequence generator.
AVInputFormat *	av_probe_input_format3 (AVProbeData pd, int is_opened, int score_ret)
	Guess the file format.
AVInputFormat *	av_probe_input_format2 (AVProbeData pd, int is_opened, int score_max)
	Guess the file format.
AVInputFormat *	av_probe_input_format (AVProbeData *pd, int is_opened)
	Guess the file format.
static int	set_codec_from_probe_data (AVFormatContext s, AVStream st, AVProbeData *pd)
static AVDictionary *	convert_format_parameters (AVFormatParameters *ap)
int	av_open_input_stream (AVFormatContext *ic_ptr, AVIOContext pb, const char filename, AVInputFormat fmt, AVFormatParameters *ap)
	Open a media file from an IO stream.
int	av_demuxer_open (AVFormatContext ic, AVFormatParameters ap)
int	av_probe_input_buffer (AVIOContext pb, AVInputFormat fmt, const char filename, void *logctx, unsigned int offset, unsigned int max_probe_size)
	Probe a bytestream to determine the input format.
int	av_open_input_file (AVFormatContext *ic_ptr, const char filename, AVInputFormat fmt, int buf_size, AVFormatParameters ap)
	Open a media file as input.
static int	init_input (AVFormatContext s, const char filename)
int	avformat_open_input (AVFormatContext *ps, const char filename, AVInputFormat fmt, AVDictionary *options)
	Open an input stream and read the header.
static AVPacket *	add_to_pktbuf (AVPacketList *packet_buffer, AVPacket pkt, AVPacketList **plast_pktl)
int	av_read_packet (AVFormatContext s, AVPacket pkt)
	Read a transport packet from a media file.
static int	get_audio_frame_size (AVCodecContext *enc, int size)
	Get the number of samples of an audio frame.
static void	compute_frame_duration (int pnum, int pden, AVStream st, AVCodecParserContext pc, AVPacket *pkt)
	Return the frame duration in seconds.
static int	is_intra_only (AVCodecContext *enc)
static void	update_initial_timestamps (AVFormatContext *s, int stream_index, int64_t dts, int64_t pts)
static void	update_initial_durations (AVFormatContext s, AVStream st, AVPacket *pkt)
static void	compute_pkt_fields (AVFormatContext s, AVStream st, AVCodecParserContext pc, AVPacket pkt)
static int	av_read_frame_internal (AVFormatContext s, AVPacket pkt)
int	av_read_frame (AVFormatContext s, AVPacket pkt)
	Return the next frame of a stream.
static void	flush_packet_queue (AVFormatContext *s)
int	av_find_default_stream_index (AVFormatContext *s)
void	ff_read_frame_flush (AVFormatContext *s)
	Flush the frame reader.
void	av_update_cur_dts (AVFormatContext s, AVStream ref_st, int64_t timestamp)
	Update cur_dts of all streams based on the given timestamp and AVStream.
void	ff_reduce_index (AVFormatContext *s, int stream_index)
	Ensure the index uses less memory than the maximum specified in AVFormatContext.max_index_size by discarding entries if it grows too large.
int	ff_add_index_entry (AVIndexEntry *index_entries, int nb_index_entries, unsigned int *index_entries_allocated_size, int64_t pos, int64_t timestamp, int size, int distance, int flags)
	Internal version of av_add_index_entry.
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.
int	ff_index_search_timestamp (const AVIndexEntry *entries, int nb_entries, int64_t wanted_timestamp, int flags)
	Internal version of av_index_search_timestamp.
int	av_index_search_timestamp (AVStream *st, int64_t wanted_timestamp, int flags)
	Get the index for a specific timestamp.
int	av_seek_frame_binary (AVFormatContext *s, int stream_index, int64_t target_ts, int flags)
	Perform a binary search using av_index_search_timestamp() and AVInputFormat.read_timestamp().
int64_t	av_gen_search (AVFormatContext s, int stream_index, int64_t target_ts, int64_t pos_min, int64_t pos_max, int64_t pos_limit, int64_t ts_min, int64_t ts_max, int flags, int64_t ts_ret, int64_t(read_timestamp)(struct AVFormatContext , int, int64_t *, int64_t))
	Perform a binary search using read_timestamp().
static int	av_seek_frame_byte (AVFormatContext *s, int stream_index, int64_t pos, int flags)
static int	av_seek_frame_generic (AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
int	av_seek_frame (AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
	Seek to the keyframe at timestamp.
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.
static int	av_has_duration (AVFormatContext *ic)
	Return TRUE if the stream has accurate duration in any stream.
static void	av_update_stream_timings (AVFormatContext *ic)
	Estimate the stream timings from the one of each components.
static void	fill_all_stream_timings (AVFormatContext *ic)
static void	av_estimate_timings_from_bit_rate (AVFormatContext *ic)
static void	av_estimate_timings_from_pts (AVFormatContext *ic, int64_t old_offset)
static void	av_estimate_timings (AVFormatContext *ic, int64_t old_offset)
static int	has_codec_parameters (AVCodecContext *enc)
static int	has_decode_delay_been_guessed (AVStream *st)
static int	try_decode_frame (AVStream st, AVPacket avpkt, AVDictionary **options)
unsigned int	ff_codec_get_tag (const AVCodecTag *tags, enum CodecID id)
enum CodecID	ff_codec_get_id (const AVCodecTag *tags, unsigned int tag)
unsigned int	av_codec_get_tag (const AVCodecTag const tags, enum CodecID id)
enum CodecID	av_codec_get_id (const AVCodecTag const tags, unsigned int tag)
static void	compute_chapters_end (AVFormatContext *s)
static int	get_std_framerate (int i)
static int	tb_unreliable (AVCodecContext *c)
int	av_find_stream_info (AVFormatContext *ic)
	Read packets of a media file to get stream information.
int	avformat_find_stream_info (AVFormatContext ic, AVDictionary *options)
	Read packets of a media file to get stream information.
static AVProgram *	find_program_from_stream (AVFormatContext *ic, int s)
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.
int	av_read_play (AVFormatContext *s)
	Start playing a network-based stream (e.g.
int	av_read_pause (AVFormatContext *s)
	Pause a network-based stream (e.g.
void	av_close_input_stream (AVFormatContext *s)
	Free a AVFormatContext allocated by av_open_input_stream.
void	avformat_free_context (AVFormatContext *s)
	Free an AVFormatContext and all its streams.
void	av_close_input_file (AVFormatContext *s)
	Close a media file (but not its codecs).
AVStream *	av_new_stream (AVFormatContext *s, int id)
	Add a new stream to a media file.
AVProgram *	av_new_program (AVFormatContext *ac, int id)
AVChapter *	ff_new_chapter (AVFormatContext s, int id, AVRational time_base, int64_t start, int64_t end, const char title)
	Add a new chapter.
int	av_set_parameters (AVFormatContext s, AVFormatParameters ap)
	media file output
int	avformat_alloc_output_context2 (AVFormatContext *avctx, AVOutputFormat oformat, const char format, const char filename)
	Allocate an AVFormatContext for an output format.
AVFormatContext *	avformat_alloc_output_context (const char format, AVOutputFormat oformat, const char *filename)
static int	validate_codec_tag (AVFormatContext s, AVStream st)
int	av_write_header (AVFormatContext *s)
	Allocate the stream private data and write the stream header to an output media file.
int	avformat_write_header (AVFormatContext s, AVDictionary *options)
	Allocate the stream private data and write the stream header to an output media file.
static int	compute_pkt_fields2 (AVFormatContext s, AVStream st, AVPacket *pkt)
int	av_write_frame (AVFormatContext s, AVPacket pkt)
	Write a packet to an output media file.
void	ff_interleave_add_packet (AVFormatContext s, AVPacket pkt, int(compare)(AVFormatContext , AVPacket , AVPacket ))
	Add packet to AVFormatContext->packet_buffer list, determining its interleaved position using compare() function argument.
static int	ff_interleave_compare_dts (AVFormatContext s, AVPacket next, AVPacket *pkt)
int	av_interleave_packet_per_dts (AVFormatContext s, AVPacket out, AVPacket *pkt, int flush)
	Interleave a packet per dts in an output media file.
static int	av_interleave_packet (AVFormatContext s, AVPacket out, AVPacket *in, int flush)
	Interleave an AVPacket correctly so it can be muxed.
int	av_interleaved_write_frame (AVFormatContext s, AVPacket pkt)
	Write a packet to an output media file ensuring correct interleaving.
int	av_write_trailer (AVFormatContext *s)
	Write the stream trailer to an output media file and free the file private data.
void	ff_program_add_stream_index (AVFormatContext *ac, int progid, unsigned int idx)
static void	print_fps (double d, const char *postfix)
static void	dump_metadata (void ctx, AVDictionary m, const char *indent)
static void	dump_stream_format (AVFormatContext *ic, int i, int index, int is_output)
void	dump_format (AVFormatContext ic, int index, const char url, int is_output)
void	av_dump_format (AVFormatContext ic, int index, const char url, int is_output)
int	parse_image_size (int width_ptr, int height_ptr, const char *str)
	Parse width and height out of string str.
int	parse_frame_rate (int frame_rate_num, int frame_rate_den, const char *arg)
	Convert framerate from a string to a fraction.
int64_t	av_gettime (void)
	Get the current time in microseconds.
uint64_t	ff_ntp_time (void)
	Get the current time since NTP epoch in microseconds.
int64_t	parse_date (const char *timestr, int duration)
	Parse datestr and return a corresponding number of microseconds.
int	find_info_tag (char arg, int arg_size, const char tag1, const char *info)
int	av_get_frame_filename (char buf, int buf_size, const char path, int number)
	Return in 'buf' the path with 'd' replaced by a number.
static void	hex_dump_internal (void avcl, FILE f, int level, uint8_t *buf, int size)
void	av_hex_dump (FILE f, uint8_t buf, int size)
	Send a nice hexadecimal dump of a buffer to the specified file stream.
void	av_hex_dump_log (void avcl, int level, uint8_t buf, int size)
	Send a nice hexadecimal dump of a buffer to the log.
static void	pkt_dump_internal (void avcl, FILE f, int level, AVPacket *pkt, int dump_payload, AVRational time_base)
void	av_pkt_dump (FILE f, AVPacket pkt, int dump_payload)
void	av_pkt_dump2 (FILE f, AVPacket pkt, int dump_payload, AVStream *st)
	Send a nice dump of a packet to the specified file stream.
void	av_pkt_dump_log (void avcl, int level, AVPacket pkt, int dump_payload)
void	av_pkt_dump_log2 (void avcl, int level, AVPacket pkt, int dump_payload, AVStream *st)
	Send a nice dump of a packet to the log.
attribute_deprecated void	ff_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)
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.
char *	ff_data_to_hex (char buff, const uint8_t src, int s, int lowercase)
int	ff_hex_to_data (uint8_t data, const char p)
	Parse a string of hexadecimal strings.
void	av_set_pts_info (AVStream *s, int pts_wrap_bits, unsigned int pts_num, unsigned int pts_den)
	Set the pts for a given stream.
int	ff_url_join (char str, int size, const char proto, const char authorization, const char hostname, int port, const char *fmt,...)
	Assemble a URL string from components.
int	ff_write_chained (AVFormatContext dst, int dst_stream, AVPacket pkt, AVFormatContext *src)
	Write a packet to another muxer than the one the user originally intended.
void	ff_parse_key_value (const char str, ff_parse_key_val_cb callback_get_buf, void context)
	Parse a string with comma-separated key=value pairs.
int	ff_find_stream_index (AVFormatContext *s, int id)
	Find stream index based on format-specific stream ID.
void	ff_make_absolute_url (char buf, int size, const char base, const char *rel)
Variables
AVInputFormat *	first_iformat = NULL
	head of registered input format linked list
AVOutputFormat *	first_oformat = NULL
	head of registered output format linked list