demux_utils.c File Reference

#include <inttypes.h>
#include "libavutil/mem.h"
#include "libavutil/avassert.h"
#include "libavutil/avstring.h"
#include "libavcodec/bytestream.h"
#include "packet_internal.h"
#include "avformat.h"
#include "avformat_internal.h"
#include "avio_internal.h"
#include "demux.h"
#include "internal.h"

Go to the source code of this file.

Macros
#define	SMPB_MAX_SAMPLES   (INT64_C(1) << 40)

Functions
struct AVCodecParserContext *	av_stream_get_parser (const AVStream *st)
void	avpriv_stream_set_need_parsing (AVStream *st, enum AVStreamParseType type)
AVChapter *	avpriv_new_chapter (AVFormatContext *s, int64_t id, AVRational time_base, int64_t start, int64_t end, const char *title)
	Add a new chapter.
int	avformat_queue_attached_pictures (AVFormatContext *s)
int	ff_add_attached_pic (AVFormatContext *s, AVStream *st0, AVIOContext *pb, AVBufferRef **buf, int size)
	Add an attached pic to an AVStream.
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	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.
int	avformat_send_command (AVFormatContext *s, enum AVFormatCommandID id, void *data)
	Send a command to the demuxer.
int	avformat_receive_command_reply (AVFormatContext *s, enum AVFormatCommandID id, void **data_out)
	Receive a command reply from the demuxer.
int	ff_generate_avci_extradata (AVStream *st)
	Generate standard extradata for AVC-Intra based on width/height and field order.
int	ff_get_extradata (void *logctx, AVCodecParameters *par, AVIOContext *pb, int size)
	Allocate extradata with additional AV_INPUT_BUFFER_PADDING_SIZE at end which is always set to 0 and fill it from pb.
int	ff_find_stream_index (const AVFormatContext *s, int id)
	Find stream index based on format-specific stream ID.
int	ff_itunes_parse_smpb (const char *value, int64_t *priming, int64_t *remainder, int64_t *samples)
	Parse the gapless playback information Apple encoders store in an iTunSMPB tag.

Macro Definition Documentation

SMPB_MAX_SAMPLES

#define SMPB_MAX_SAMPLES   (INT64_C(1) << 40)

Definition at line 368 of file demux_utils.c.

Referenced by ff_itunes_parse_smpb().

Function Documentation

av_stream_get_parser()

struct AVCodecParserContext * av_stream_get_parser

(

const AVStream *

st

)

Definition at line 36 of file demux_utils.c.

Referenced by ist_dts_update().

avpriv_stream_set_need_parsing()

void avpriv_stream_set_need_parsing	(	AVStream *	st,
		enum AVStreamParseType	type )

Definition at line 41 of file demux_utils.c.

Referenced by v4l2_read_header().

avpriv_new_chapter()

AVChapter * avpriv_new_chapter	(	AVFormatContext *	s,
		int64_t	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 46 of file demux_utils.c.

Referenced by aa_read_header(), asf_read_marker(), asf_read_marker(), concat_parse_script(), decode_info_header(), dvdvideo_chapters_setup_preindex(), dvdvideo_chapters_setup_simple(), ff_id3v2_parse_chapters(), flac_read_header(), mov_metadata_hmmt(), mov_read_chapters(), mov_read_chpl(), ogm_chapter(), read_chapter(), and read_header().

ff_add_attached_pic()

int ff_add_attached_pic	(	AVFormatContext *	s,
		AVStream *	st,
		AVIOContext *	pb,
		AVBufferRef **	buf,
		int	size )

Add an attached pic to an AVStream.

Parameters

st	if set, the stream to add the attached pic to; if unset, a new stream will be added to s.
pb	AVIOContext to read data from if buf is unset.
buf	if set, it contains the data and size information to be used for the attached pic; if unset, data is read from pb.
size	the size of the data to read if buf is unset.

Returns

0 on success, < 0 on error. On error, this function removes the stream it has added (if any).

Definition at line 110 of file demux_utils.c.

Referenced by ape_tag_read_field(), asf_read_picture(), ff_flac_parse_picture(), ff_id3v2_parse_apic(), get_attachment(), mov_read_chapters(), and mov_read_covr().

ff_add_param_change()

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 145 of file demux_utils.c.

Referenced by flv_read_packet(), load_ipmovie_packet(), and swf_read_packet().

ff_generate_avci_extradata()

int ff_generate_avci_extradata

(

AVStream *

st

)

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

Definition at line 208 of file demux_utils.c.

Referenced by mov_finalize_stsd_entry(), and mxf_parse_structural_metadata().

ff_get_extradata()

int ff_get_extradata	(	void *	logctx,
		AVCodecParameters *	par,
		AVIOContext *	pb,
		int	size )

Allocate extradata with additional AV_INPUT_BUFFER_PADDING_SIZE at end which is always set to 0 and fill it from pb.

Parameters

size	size of extradata

Returns

>= 0 if OK, AVERROR_xxx on error

Definition at line 343 of file demux_utils.c.

Referenced by aax_read_header(), acm_read_header(), adx_read_header(), aiff_read_header(), aix_read_header(), apc_read_header(), ape_tag_read_field(), avi_read_header(), bfi_read_header(), bonk_read_header(), decode_stream_header(), ff_get_wav_header(), ff_mp4_read_dec_config_descr(), flv_get_extradata(), get_codec_data(), idcin_read_header(), mov_parse_stsd_data(), mov_read_dfla(), mov_read_dvc1(), mov_read_glbl(), mov_read_strf(), mov_read_wave(), mpc8_read_header(), mpc_read_header(), osq_read_header(), parse_chunk(), parse_video_info(), read_header(), read_header(), read_kuki_chunk(), rka_read_header(), rl2_read_header(), rm_read_extradata(), rsd_read_header(), vc1t_read_header(), wady_read_header(), wsvqa_read_header(), and yop_read_header().

ff_find_stream_index()

int ff_find_stream_index	(	const AVFormatContext *	s,
		int	id )

Find stream index based on format-specific stream ID.

Returns

stream index, or < 0 on error

Definition at line 359 of file demux_utils.c.

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

ff_itunes_parse_smpb()

int ff_itunes_parse_smpb	(	const char *	value,
		int64_t *	priming,
		int64_t *	remainder,
		int64_t *	samples )

Parse the gapless playback information Apple encoders store in an iTunSMPB tag.

The tag is a list of hexadecimal fields; the ones of interest are

<reserved> <priming> <remainder> <valid samples>

The decoded stream holds the three sample counts back to back, the priming and remainder samples being encoder artifacts.

The counts are returned small enough to be added and rescaled without overflowing.

Parameters

value	tag contents
priming	number of samples to discard at the start of the stream
remainder	number of samples to discard at the end of the stream
samples	number of valid samples between the two

Returns

>= 0 if OK, AVERROR_INVALIDDATA if the tag could not be parsed or holds counts too large to be sample counts

Definition at line 370 of file demux_utils.c.

Referenced by mov_read_custom(), and mp3_parse_itunes_smpb().