internal.h File Reference

#include <stdint.h>
#include "avformat.h"

Go to the source code of this file.

Data Structures
struct	AVCodecTag
struct	CodecMime

Macros
#define	MAX_URL_SIZE   4096
#define	hex_dump_debug(class, buf, size)
#define	dynarray_add(tab, nb_ptr, elem)
#define	NTP_OFFSET   2208988800ULL
#define	NTP_OFFSET_US   (NTP_OFFSET * 1000000ULL)
#define	SPACE_CHARS   " \t\r\n"

Typedefs
typedef void(*	ff_parse_key_val_cb )(void *context, const char *key, int key_len, char **dest, int *dest_len)
	Callback function type for ff_parse_key_value.

Functions
struct tm *	ff_brktimegm (time_t secs, struct tm *tm)
char *	ff_data_to_hex (char *buf, const uint8_t *src, int size, int lowercase)
int	ff_hex_to_data (uint8_t *data, const char *p)
	Parse a string of hexadecimal strings.
void	ff_program_add_stream_index (AVFormatContext *ac, int progid, unsigned int idx)
int	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.
void	ff_read_frame_flush (AVFormatContext *s)
	Flush the frame reader.
uint64_t	ff_ntp_time (void)
	Get the current time since NTP epoch in microseconds.
void	ff_sdp_write_media (char *buff, int size, AVStream *st, int idx, const char *dest_addr, const char *dest_type, int port, int ttl, AVFormatContext *fmt)
	Append the media-specific SDP fragment for the media stream c to the buffer buff.
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.
int	ff_get_v_length (uint64_t val)
	Get the length in bytes which is needed to store val as v.
void	ff_put_v (AVIOContext *bc, uint64_t val)
	Put val using a variable number of bytes.
int	ff_get_line (AVIOContext *s, char *buf, int maxlen)
	Read a whole line of text from AVIOContext.
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.
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	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.
AVChapter *	avpriv_new_chapter (AVFormatContext *s, int id, AVRational time_base, int64_t start, int64_t end, const char *title)
	Add a new chapter.
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.
enum AVCodecID	ff_guess_image2_codec (const char *filename)
int64_t	ff_iso8601_to_unix_time (const char *datestr)
	Convert a date string in ISO8601 format to Unix timestamp.
int	ff_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().
void	ff_update_cur_dts (AVFormatContext *s, AVStream *ref_st, int64_t timestamp)
	Update cur_dts of all streams based on the given timestamp and AVStream.
int	ff_find_last_ts (AVFormatContext *s, int stream_index, int64_t *ts, int64_t *pos, int64_t(*read_timestamp)(struct AVFormatContext *, int, int64_t *, int64_t))
int64_t	ff_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().
void	avpriv_set_pts_info (AVStream *s, int pts_wrap_bits, unsigned int pts_num, unsigned int pts_den)
	Set the time base and wrapping info for a given stream.
int	ff_add_param_change (AVPacket *pkt, int32_t channels, uint64_t channel_layout, int32_t sample_rate, int32_t width, int32_t height)
	Add side data to a packet for changing parameters to the given values.
int	ff_framehash_write_header (AVFormatContext *s)
	Set the timebase for each stream from the corresponding codec timebase and print it.
int	ff_read_packet (AVFormatContext *s, AVPacket *pkt)
	Read a transport packet from a media file.
int	ff_interleave_packet_per_dts (AVFormatContext *s, AVPacket *out, AVPacket *pkt, int flush)
	Interleave a packet per dts in an output media file.
void	ff_free_stream (AVFormatContext *s, AVStream *st)
void	ff_compute_frame_duration (int *pnum, int *pden, AVStream *st, AVCodecParserContext *pc, AVPacket *pkt)
	Return the frame duration in seconds.
int	ff_get_audio_frame_size (AVCodecContext *enc, int size, int mux)
	Get the number of samples of an audio frame.
unsigned int	ff_codec_get_tag (const AVCodecTag *tags, enum AVCodecID id)
enum AVCodecID	ff_codec_get_id (const AVCodecTag *tags, unsigned int tag)
enum AVCodecID	ff_get_pcm_codec_id (int bps, int flt, int be, int sflags)
	Select a PCM codec based on the given parameters.
AVRational	ff_choose_timebase (AVFormatContext *s, AVStream *st, int min_precission)
	Chooses a timebase for muxing the specified stream.
void	ff_generate_avci_extradata (AVStream *st)
	Generate standard extradata for AVC-Intra based on width/height and field order.

Macro Definition Documentation

#define MAX_URL_SIZE   4096

Definition at line 27 of file internal.h.

Referenced by ftp_open(), http_open_cnx(), http_read_header(), open_input(), parse_playlist(), and process_line().

#define hex_dump_debug	(		class,
			buf,
			size
	)

Definition at line 32 of file internal.h.

Referenced by pat_cb(), pmt_cb(), and sdt_cb().

#define dynarray_add	(		tab,
			nb_ptr,
			elem
	)

Value:

do {\
    av_dynarray_add((tab), nb_ptr, (elem));\
} while(0)

Definition at line 54 of file internal.h.

Referenced by av_new_program(), avpriv_new_chapter(), ff_rtsp_setup_output_streams(), matroska_parse_frame(), matroska_parse_rm_audio(), mpegts_add_service(), new_variant(), and parse_playlist().

#define NTP_OFFSET   2208988800ULL

Definition at line 86 of file internal.h.

#define NTP_OFFSET_US   (NTP_OFFSET * 1000000ULL)

Definition at line 87 of file internal.h.

Referenced by ff_ntp_time(), and rtp_write_header().

#define SPACE_CHARS   " \t\r\n"

Definition at line 151 of file internal.h.

Referenced by concat_read_header(), ff_hex_to_data(), get_keyword(), get_word(), get_word_until_chars(), process_line(), and rtsp_parse_range_npt().

Typedef Documentation

typedef void(* ff_parse_key_val_cb)(void *context, const char *key, int key_len, char **dest, int *dest_len)

Callback function type for ff_parse_key_value.

Parameters

key	a pointer to the key
key_len	the number of bytes that belong to the key, including the '=' char
dest	return the destination pointer for the value in *dest, may be null to ignore the value
dest_len	the length of the *dest buffer

Definition at line 163 of file internal.h.

Function Documentation

struct tm* ff_brktimegm ( time_t  secs, struct tm *  tm  )

read

Definition at line 29 of file cutils.c.

Referenced by dv_write_pack().

char* ff_data_to_hex	(	char *	buf,
		const uint8_t *	src,
		int	size,
		int	lowercase
	)

Definition at line 3794 of file utils.c.

Referenced by do_llnw_auth(), ff_rdt_calc_response_and_checksum(), hex_log(), make_digest_auth(), open_input(), and param_write_hex().

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 3815 of file utils.c.

Referenced by parse_fmtp_config(), and parse_playlist().

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

Definition at line 3372 of file utils.c.

Referenced by hls_read_header(), and pmt_cb().

int 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.

Returns

0, or < 0 on error

Definition at line 576 of file mux.c.

Referenced by ff_audio_rechunk_interleave(), and ff_interleave_packet_per_dts().

void ff_read_frame_flush

(

AVFormatContext *

s

)

Flush the frame reader.

Definition at line 1522 of file utils.c.

Referenced by avformat_seek_file(), ff_restore_parser_state(), ff_seek_frame_binary(), mpegts_get_dts(), search_hi_lo_keyframes(), seek_frame_generic(), and seek_frame_internal().

uint64_t ff_ntp_time

(

void

)

Get the current time since NTP epoch in microseconds.

Definition at line 3578 of file utils.c.

Referenced by rtp_write_header(), and rtp_write_packet().

void ff_sdp_write_media	(	char *	buff,
		int	size,
		AVStream *	st,
		int	idx,
		const char *	dest_addr,
		const char *	dest_type,
		int	port,
		int	ttl,
		AVFormatContext *	fmt
	)

Append the media-specific SDP fragment for the media stream c to the buffer buff.

Note, the buffer needs to be initialized, since it is appended to existing content.

Parameters

buff	the buffer to append the SDP fragment to
size	the size of the buff buffer
st	the AVStream of the media to describe
idx	the global stream index
dest_addr	the destination address of the media stream, may be NULL
dest_type	the destination address type, may be NULL
port	the destination port of the media stream, 0 if unknown
ttl	the time to live of the stream, 0 if not multicast
fmt	the AVFormatContext, which might contain options modifying the generated SDP

Definition at line 708 of file sdp.c.

Referenced by mov_write_udta_sdp().

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 845 of file mux.c.

Referenced by ff_mov_add_hinted_packet(), hls_write_packet(), ism_write_packet(), rtsp_write_packet(), sap_write_packet(), and seg_write_packet().

int ff_get_v_length

(

uint64_t

val

)

Get the length in bytes which is needed to store val as v.

Definition at line 335 of file aviobuf.c.

Referenced by ff_put_v(), and nut_write_packet().

void ff_put_v	(	AVIOContext *	bc,
		uint64_t	val
	)

Put val using a variable number of bytes.

Definition at line 345 of file aviobuf.c.

Referenced by nut_write_packet(), put_packet(), put_s(), put_str(), put_tt(), write_chapter(), write_globalinfo(), write_index(), write_mainheader(), write_streamheader(), and write_streaminfo().

int ff_get_line	(	AVIOContext *	s,
		char *	buf,
		int	maxlen
	)

Read a whole line of text from AVIOContext.

Stop reading after reaching either a \n, a \0 or EOF. The returned string is always \0-terminated, and may be truncated if the buffer is too small.

Parameters

s	the read-only AVIOContext
buf	buffer to store the read line
maxlen	size of the buffer

Returns

the length of the string written in the buffer, not including the final \0

Definition at line 620 of file aviobuf.c.

Referenced by aqt_read_header(), concat_read_header(), jacosub_read_header(), microdvd_read_header(), mpl2_read_header(), mpsub_read_header(), nist_read_header(), pjs_read_header(), pvf_read_header(), read_chomp_line(), subviewer1_read_header(), subviewer_read_header(), and vplayer_read_header().

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 3870 of file utils.c.

Referenced by ff_http_auth_handle_header(), and parse_playlist().

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 3924 of file utils.c.

Referenced by get_sindex(), parse_chunks(), and pmt_cb().

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 1636 of file utils.c.

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

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 1575 of file utils.c.

Referenced by av_add_index_entry(), and read_header().

AVChapter* avpriv_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 3348 of file utils.c.

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

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 1562 of file utils.c.

Referenced by av_read_frame(), mpegps_read_pes_header(), mpegts_get_dts(), and read_frame_internal().

enum AVCodecID ff_guess_image2_codec

(

const char *

filename

)

Definition at line 99 of file img2.c.

Referenced by ape_tag_read_field(), av_guess_codec(), av_guess_format(), img_read_header(), and img_read_probe().

int64_t ff_iso8601_to_unix_time

(

const char *

datestr

)

Convert a date string in ISO8601 format to Unix timestamp.

Definition at line 3934 of file utils.c.

Referenced by dv_init_mux(), gxf_write_umf_material_description(), mkv_write_header(), mov_write_header(), and mxf_write_header().

int ff_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().

Parameters

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

Definition at line 1686 of file utils.c.

Referenced by asf_read_seek(), ogg_read_seek(), rm_read_seek(), and seek_frame_internal().

void ff_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 1549 of file utils.c.

Referenced by ff_seek_frame_binary(), idcin_read_seek(), matroska_read_seek(), mp3_seek(), mpc8_read_seek(), mxf_read_seek(), and seek_frame_generic().

int ff_find_last_ts	(	AVFormatContext *	s,
		int	stream_index,
		int64_t *	ts,
		int64_t *	pos,
		int64_t(*)(struct AVFormatContext *, int, int64_t *, int64_t)	read_timestamp
	)

Definition at line 1748 of file utils.c.

Referenced by ff_gen_search(), and find_duration().

int64_t ff_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().

Parameters

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

Definition at line 1783 of file utils.c.

Referenced by ff_seek_frame_binary(), and read_seek().

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

Set the time base and wrapping info for a given stream.

This will be used to interpret the stream's timestamps. If the new time base is invalid (numerator or denominator are non-positive), it leaves the stream unchanged.

Parameters

s	stream
pts_wrap_bits	number of bits effectively used by the pts (used for wrap control)
pts_num	time base numerator
pts_den	time base denominator

Definition at line 3851 of file utils.c.

Referenced by add_av_stream1(), adp_read_header(), adts_aac_read_header(), adx_read_header(), afc_read_header(), aiff_read_header(), aiff_write_header(), amr_read_header(), ape_read_header(), aqt_read_header(), asf_read_stream_properties(), asf_write_header1(), asfrtp_parse_sdp_line(), ass_read_header(), ast_read_header(), audio_read_header(), audio_write_header(), avformat_new_stream(), avi_read_header(), avi_write_header(), avr_read_header(), bfi_read_header(), bmv_read_header(), cdata_read_header(), cdxl_read_packet(), celt_header(), cin_read_header(), create_audio_stream(), create_new_audio_stream(), create_stream(), dc1394_read_common(), 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(), epaf_read_header(), fbdev_read_header(), ff_framehash_write_header(), ff_raw_video_read_header(), ff_rm_read_mdpr_codecdata(), ff_voc_get_packet(), ffm2_read_header(), ffm_read_header(), ffm_write_header(), film_read_header(), flac_header(), flac_read_header(), flv_write_header(), g722_read_header(), g723_1_init(), g729_read_header(), get_packet_header(), gif_read_header(), gif_write_header(), grab_read_header(), gsm_read_header(), gxf_header(), gxf_write_header(), hls_read_header(), idcin_read_header(), iff_read_header(), ilbc_read_header(), img_read_header(), init_stream(), ipmovie_read_header(), ircam_read_header(), iss_read_header(), jacosub_read_header(), lavfi_read_header(), libquvi_read_header(), lmlm4_read_header(), loas_read_header(), lvf_read_header(), lxf_read_header(), matroska_read_header(), microdvd_read_header(), microdvd_write_header(), mkv_write_tracks(), mmf_read_header(), modplug_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(), mpl2_read_header(), mpsub_read_header(), msnwc_tcp_read_header(), mtv_read_header(), mv_read_header(), mxf_parse_structural_metadata(), mxf_write_header(), mxg_read_header(), nc_read_header(), new_stream(), nist_read_header(), nsv_parse_NSVs_header(), nut_read_header(), nut_write_header(), nuv_header(), ogg_new_stream(), ogg_write_header(), ogm_dshow_header(), ogm_header(), old_dirac_header(), oma_read_header(), opus_header(), parse_audio_var(), parse_strk(), parse_video_var(), parse_vtrk(), pcm_read_header(), pjs_read_header(), pmp_header(), pulse_read_header(), pva_read_header(), pvf_read_header(), qt_rtp_parse_packet(), r3d_read_red1(), rawvideo_read_header(), read_frame(), read_gab2_sub(), read_header(), read_header_gme(), read_sl_header(), realtext_read_header(), redspark_read_header(), rl2_read_header(), roq_read_packet(), rpl_read_header(), rsd_read_header(), rso_read_header(), sami_read_header(), sbg_read_header(), seq_read_header(), siff_parse_vbv1(), skeleton_header(), smacker_read_header(), smjpeg_read_header(), smjpeg_write_header(), smush_read_header(), sol_read_header(), sox_read_header(), speex_header(), srt_read_header(), srt_write_header(), str_read_packet(), subviewer1_read_header(), subviewer_read_header(), swf_read_packet(), tak_read_header(), tedcaptions_read_header(), 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_packet(), vivo_read_header(), vmd_read_header(), vorbis_header(), vplayer_read_header(), vqf_read_header(), wc3_read_header(), webvtt_read_header(), webvtt_write_header(), write_header(), write_stream_data(), wsaud_read_header(), wsvqa_read_header(), wsvqa_read_packet(), wv_read_header(), x11grab_read_header(), xa_read_header(), xmv_read_header(), xwma_read_header(), yop_read_header(), and yuv4_read_header().

int ff_add_param_change	(	AVPacket *	pkt,
		int32_t	channels,
		uint64_t	channel_layout,
		int32_t	sample_rate,
		int32_t	width,
		int32_t	height
	)

Add side data to a packet for changing parameters to the given values.

Parameters set to 0 aren't included in the change.

Definition at line 3981 of file utils.c.

Referenced by flv_read_packet(), and load_ipmovie_packet().

int ff_framehash_write_header

(

AVFormatContext *

s

)

Set the timebase for each stream from the corresponding codec timebase and print it.

Definition at line 23 of file framehash.c.

int ff_read_packet	(	AVFormatContext *	s,
		AVPacket *	pkt
	)

Read a transport packet from a media file.

Parameters

s	media file handle
pkt	is filled

Returns

0 if OK, AVERROR_xxx on error

Definition at line 618 of file utils.c.

Referenced by asfrtp_parse_packet(), estimate_timings_from_pts(), get_subtitle_pkt(), read_frame_internal(), read_gab2_sub(), and seek_subtitle().

int ff_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 667 of file mux.c.

Referenced by gxf_interleave_packet(), and interleave_packet().

void ff_free_stream	(	AVFormatContext *	s,
		AVStream *	st
	)

Definition at line 3168 of file utils.c.

Referenced by avformat_free_context(), and ff_rm_read_mdpr_codecdata().

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

Return the frame duration in seconds.

Return 0 if not available.

Definition at line 746 of file utils.c.

Referenced by compute_pkt_fields(), and compute_pkt_fields2().

int ff_get_audio_frame_size	(	AVCodecContext *	enc,
		int	size,
		int	mux
	)

Get the number of samples of an audio frame.

Return -1 on error.

Definition at line 717 of file utils.c.

Referenced by compute_pkt_fields2(), and ff_compute_frame_duration().

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

Definition at line 2493 of file utils.c.

Referenced by ast_write_header(), caf_write_header(), gxf_write_header(), ipod_get_codec_tag(), ircam_write_header(), mkv_write_codecprivate(), mkv_write_tracks(), mov_find_codec_tag(), mov_get_codec_tag(), mov_write_esds_tag(), mov_write_isml_manifest(), mp4_get_codec_tag(), smjpeg_write_header(), and swf_write_video().

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

Definition at line 2503 of file utils.c.

Referenced by asf_read_stream_properties(), ast_read_header(), av_codec_get_id(), avi_read_header(), create_new_audio_stream(), decode_stream_header(), dshow_add_device(), dshow_cycle_formats(), ff_mov_read_stsd_entries(), ff_mp4_read_dec_config_descr(), ff_rm_read_mdpr_codecdata(), ff_voc_get_packet(), get_aiff_header(), get_codec_data(), ircam_read_header(), lvf_read_header(), lxf_read_header(), matroska_read_header(), nsv_parse_NSVs_header(), nut_read_header(), ogm_dshow_header(), ogm_header(), oma_read_header(), parse_media_type(), read_desc_chunk(), read_header(), rm_read_audio_stream_info(), rsd_read_header(), rso_read_header(), smjpeg_read_header(), and swf_read_packet().

enum AVCodecID ff_get_pcm_codec_id	(	int	bps,
		int	flt,
		int	be,
		int	sflags
	)

Select a PCM codec based on the given parameters.

Parameters

bps	bits-per-sample
flt	floating-point
be	big-endian
sflags	signed flags. each bit corresponds to one byte of bit depth. e.g. the 1st bit indicates if 8-bit should be signed or unsigned, the 2nd bit indicates if 16-bit should be signed or unsigned, etc... This is useful for formats such as WAVE where only 8-bit is unsigned and all other bit depths are signed.

Returns

a PCM codec id or AV_CODEC_ID_NONE

Definition at line 2517 of file utils.c.

Referenced by ff_mov_get_lpcm_codec_id(), get_codec_data(), nist_read_header(), and pvf_read_header().

AVRational ff_choose_timebase	(	AVFormatContext *	s,
		AVStream *	st,
		int	min_precission
	)

Chooses a timebase for muxing the specified stream.

The choosen timebase allows sample accurate timestamps based on the framerate or sample rate for audio streams. It also is at least as precisse as 1/min_precission would be.

Definition at line 104 of file mux.c.

Referenced by nut_write_header().

void ff_generate_avci_extradata

(

AVStream *

st

)

Generate standard extradata for AVC-Intra based on width/height and field order.

Definition at line 4123 of file utils.c.

Referenced by mov_read_trak(), and mxf_parse_structural_metadata().