AC3DecodeContext Struct Reference

List of all members.

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Detailed Description

Definition at line 131 of file ac3dec.c.

Public Member Functions
	DECLARE_ALIGNED_16 (float, transform_coeffs[AC3_MAX_CHANNELS][256])
	transform coefficients
	DECLARE_ALIGNED_16 (float, output[AC3_MAX_CHANNELS-1][256])
	output after imdct transform and windowing
	DECLARE_ALIGNED_16 (short, int_output[AC3_MAX_CHANNELS-1][256])
	final 16-bit integer output
	DECLARE_ALIGNED_16 (float, delay[AC3_MAX_CHANNELS-1][256])
	delay - added to the next block
	DECLARE_ALIGNED_16 (float, tmp_imdct[256])
	temporary storage for imdct transform
	DECLARE_ALIGNED_16 (float, tmp_output[512])
	temporary storage for output before windowing
	DECLARE_ALIGNED_16 (float, window[256])
	window coefficients
Public Attributes
int	acmod
	audio coding mode
int	dsurmod
	dolby surround mode
int	blksw [AC3_MAX_CHANNELS]
	block switch flags
int	dithflag [AC3_MAX_CHANNELS]
	dither flags
int	dither_all
	true if all channels are dithered
int	cplinu
	coupling in use
int	chincpl [AC3_MAX_CHANNELS]
	channel in coupling
int	phsflginu
	phase flags in use
int	cplbndstrc [18]
	coupling band structure
int	rematstr
	rematrixing strategy
int	nrematbnd
	number of rematrixing bands
int	rematflg [4]
	rematrixing flags
int	expstr [AC3_MAX_CHANNELS]
	exponent strategies
int	snroffst [AC3_MAX_CHANNELS]
	signal-to-noise ratio offsets
int	fgain [AC3_MAX_CHANNELS]
	fast gain values (signal-to-mask ratio)
int	deltbae [AC3_MAX_CHANNELS]
	delta bit allocation exists
int	deltnseg [AC3_MAX_CHANNELS]
	number of delta segments
uint8_t	deltoffst [AC3_MAX_CHANNELS][8]
	delta segment offsets
uint8_t	deltlen [AC3_MAX_CHANNELS][8]
	delta segment lengths
uint8_t	deltba [AC3_MAX_CHANNELS][8]
	delta values for each segment
int	sampling_rate
	sample frequency, in Hz
int	bit_rate
	stream bit rate, in bits-per-second
int	frame_size
	current frame size, in bytes
int	nchans
	number of total channels
int	nfchans
	number of full-bandwidth channels
int	lfeon
	lfe channel in use
int	lfe_ch
	index of LFE channel
int	output_mode
	output channel configuration
int	out_channels
	number of output channels
float	downmix_coeffs [AC3_MAX_CHANNELS][2]
	stereo downmix coefficients
float	dialnorm [2]
	dialogue normalization
float	dynrng [2]
	dynamic range
float	cplco [AC3_MAX_CHANNELS][18]
	coupling coordinates
int	ncplbnd
	number of coupling bands
int	ncplsubnd
	number of coupling sub bands
int	startmant [AC3_MAX_CHANNELS]
	start frequency bin
int	endmant [AC3_MAX_CHANNELS]
	end frequency bin
AC3BitAllocParameters	bit_alloc_params
	bit allocation parameters
int8_t	dexps [AC3_MAX_CHANNELS][256]
	decoded exponents
uint8_t	bap [AC3_MAX_CHANNELS][256]
	bit allocation pointers
int16_t	psd [AC3_MAX_CHANNELS][256]
	scaled exponents
int16_t	bndpsd [AC3_MAX_CHANNELS][50]
	interpolated exponents
int16_t	mask [AC3_MAX_CHANNELS][50]
	masking curve values
MDCTContext	imdct_512
	for 512 sample IMDCT
MDCTContext	imdct_256
	for 256 sample IMDCT
DSPContext	dsp
	for optimization
float	add_bias
	offset for float_to_int16 conversion
float	mul_bias
	scaling for float_to_int16 conversion
GetBitContext	gb
	bitstream reader
AVRandomState	dith_state
	for dither generation
AVCodecContext *	avctx
	parent context

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Member Function Documentation

AC3DecodeContext::DECLARE_ALIGNED_16	(	float	,
		transform_coeffs	[AC3_MAX_CHANNELS][256]
	)

transform coefficients

AC3DecodeContext::DECLARE_ALIGNED_16	(	float	,
		output	[AC3_MAX_CHANNELS-1][256]
	)

output after imdct transform and windowing

AC3DecodeContext::DECLARE_ALIGNED_16	(	short	,
		int_output	[AC3_MAX_CHANNELS-1][256]
	)

final 16-bit integer output

AC3DecodeContext::DECLARE_ALIGNED_16	(	float	,
		delay	[AC3_MAX_CHANNELS-1][256]
	)

delay - added to the next block

AC3DecodeContext::DECLARE_ALIGNED_16	(	float	,
		tmp_imdct	[256]
	)

temporary storage for imdct transform

AC3DecodeContext::DECLARE_ALIGNED_16	(	float	,
		tmp_output	[512]
	)

temporary storage for output before windowing

AC3DecodeContext::DECLARE_ALIGNED_16	(	float	,
		window	[256]
	)

window coefficients

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Member Data Documentation

int AC3DecodeContext::acmod

audio coding mode

Definition at line 132 of file ac3dec.c.

Referenced by ac3_parse_audio_block(), and ac3_parse_header().

int AC3DecodeContext::dsurmod

dolby surround mode

Definition at line 133 of file ac3dec.c.

Referenced by ac3_parse_header().

int AC3DecodeContext::blksw[AC3_MAX_CHANNELS]

block switch flags

Definition at line 134 of file ac3dec.c.

Referenced by ac3_parse_audio_block(), and do_imdct().

int AC3DecodeContext::dithflag[AC3_MAX_CHANNELS]

dither flags

Definition at line 135 of file ac3dec.c.

Referenced by ac3_parse_audio_block(), and remove_dithering().

int AC3DecodeContext::dither_all

true if all channels are dithered

Definition at line 136 of file ac3dec.c.

Referenced by ac3_parse_audio_block(), and get_transform_coeffs().

int AC3DecodeContext::cplinu

coupling in use

Definition at line 137 of file ac3dec.c.

Referenced by ac3_parse_audio_block().

int AC3DecodeContext::chincpl[AC3_MAX_CHANNELS]

channel in coupling

Definition at line 138 of file ac3dec.c.

Referenced by ac3_parse_audio_block(), get_transform_coeffs(), remove_dithering(), and uncouple_channels().

int AC3DecodeContext::phsflginu

phase flags in use

Definition at line 139 of file ac3dec.c.

Referenced by ac3_parse_audio_block().

int AC3DecodeContext::cplbndstrc[18]

coupling band structure

Definition at line 140 of file ac3dec.c.

Referenced by ac3_parse_audio_block(), and uncouple_channels().

int AC3DecodeContext::rematstr

rematrixing strategy

Definition at line 141 of file ac3dec.c.

Referenced by ac3_parse_audio_block().

int AC3DecodeContext::nrematbnd

number of rematrixing bands

Definition at line 142 of file ac3dec.c.

Referenced by ac3_parse_audio_block(), and do_rematrixing().

int AC3DecodeContext::rematflg[4]

rematrixing flags

Definition at line 143 of file ac3dec.c.

Referenced by ac3_parse_audio_block(), and do_rematrixing().

int AC3DecodeContext::expstr[AC3_MAX_CHANNELS]

exponent strategies

Definition at line 144 of file ac3dec.c.

Referenced by ac3_parse_audio_block().

int AC3DecodeContext::snroffst[AC3_MAX_CHANNELS]

signal-to-noise ratio offsets

Definition at line 145 of file ac3dec.c.

Referenced by ac3_parse_audio_block().

int AC3DecodeContext::fgain[AC3_MAX_CHANNELS]

fast gain values (signal-to-mask ratio)

Definition at line 146 of file ac3dec.c.

Referenced by ac3_parse_audio_block().

int AC3DecodeContext::deltbae[AC3_MAX_CHANNELS]

delta bit allocation exists

Definition at line 147 of file ac3dec.c.

Referenced by ac3_parse_audio_block().

int AC3DecodeContext::deltnseg[AC3_MAX_CHANNELS]

number of delta segments

Definition at line 148 of file ac3dec.c.

Referenced by ac3_parse_audio_block().

uint8_t AC3DecodeContext::deltoffst[AC3_MAX_CHANNELS][8]

delta segment offsets

Definition at line 149 of file ac3dec.c.

Referenced by ac3_parse_audio_block().

uint8_t AC3DecodeContext::deltlen[AC3_MAX_CHANNELS][8]

delta segment lengths

Definition at line 150 of file ac3dec.c.

Referenced by ac3_parse_audio_block().

uint8_t AC3DecodeContext::deltba[AC3_MAX_CHANNELS][8]

delta values for each segment

Definition at line 151 of file ac3dec.c.

Referenced by ac3_parse_audio_block().

int AC3DecodeContext::sampling_rate

sample frequency, in Hz

Definition at line 153 of file ac3dec.c.

Referenced by ac3_decode_frame(), and ac3_parse_header().

int AC3DecodeContext::bit_rate

stream bit rate, in bits-per-second

Definition at line 154 of file ac3dec.c.

Referenced by ac3_decode_frame(), and ac3_parse_header().

int AC3DecodeContext::frame_size

current frame size, in bytes

Definition at line 155 of file ac3dec.c.

Referenced by ac3_decode_frame(), and ac3_parse_header().

int AC3DecodeContext::nchans

number of total channels

Definition at line 157 of file ac3dec.c.

Referenced by ac3_decode_frame(), ac3_parse_audio_block(), ac3_parse_header(), and get_transform_coeffs().

int AC3DecodeContext::nfchans

number of full-bandwidth channels

Definition at line 158 of file ac3dec.c.

Referenced by ac3_parse_audio_block(), ac3_parse_header(), do_imdct(), remove_dithering(), and uncouple_channels().

int AC3DecodeContext::lfeon

lfe channel in use

Definition at line 159 of file ac3dec.c.

Referenced by ac3_parse_header().

int AC3DecodeContext::lfe_ch

index of LFE channel

Definition at line 160 of file ac3dec.c.

Referenced by ac3_parse_audio_block(), and ac3_parse_header().

int AC3DecodeContext::output_mode

output channel configuration

Definition at line 161 of file ac3dec.c.

Referenced by ac3_decode_frame(), ac3_parse_audio_block(), ac3_parse_header(), and do_imdct().

int AC3DecodeContext::out_channels

number of output channels

Definition at line 162 of file ac3dec.c.

Referenced by ac3_decode_frame(), ac3_parse_audio_block(), and ac3_parse_header().

float AC3DecodeContext::downmix_coeffs[AC3_MAX_CHANNELS][2]

stereo downmix coefficients

Definition at line 164 of file ac3dec.c.

Referenced by ac3_parse_audio_block(), and ac3_parse_header().

float AC3DecodeContext::dialnorm[2]

dialogue normalization

Definition at line 165 of file ac3dec.c.

Referenced by ac3_parse_audio_block(), and ac3_parse_header().

float AC3DecodeContext::dynrng[2]

dynamic range

Definition at line 166 of file ac3dec.c.

Referenced by ac3_parse_audio_block().

float AC3DecodeContext::cplco[AC3_MAX_CHANNELS][18]

coupling coordinates

Definition at line 167 of file ac3dec.c.

Referenced by ac3_parse_audio_block(), and uncouple_channels().

int AC3DecodeContext::ncplbnd

number of coupling bands

Definition at line 168 of file ac3dec.c.

Referenced by ac3_parse_audio_block(), and uncouple_channels().

int AC3DecodeContext::ncplsubnd

number of coupling sub bands

Definition at line 169 of file ac3dec.c.

Referenced by ac3_parse_audio_block().

int AC3DecodeContext::startmant[AC3_MAX_CHANNELS]

start frequency bin

Definition at line 170 of file ac3dec.c.

Referenced by ac3_parse_audio_block(), get_transform_coeffs_ch(), remove_dithering(), and uncouple_channels().

int AC3DecodeContext::endmant[AC3_MAX_CHANNELS]

end frequency bin

Definition at line 171 of file ac3dec.c.

Referenced by ac3_parse_audio_block(), do_rematrixing(), get_transform_coeffs(), get_transform_coeffs_ch(), and remove_dithering().

AC3BitAllocParameters AC3DecodeContext::bit_alloc_params

bit allocation parameters

Definition at line 172 of file ac3dec.c.

Referenced by ac3_parse_audio_block(), and ac3_parse_header().

int8_t AC3DecodeContext::dexps[AC3_MAX_CHANNELS][256]

decoded exponents

Definition at line 174 of file ac3dec.c.

Referenced by ac3_parse_audio_block(), and get_transform_coeffs_ch().

uint8_t AC3DecodeContext::bap[AC3_MAX_CHANNELS][256]

bit allocation pointers

Definition at line 175 of file ac3dec.c.

Referenced by ac3_parse_audio_block(), get_transform_coeffs_ch(), and remove_dithering().

int16_t AC3DecodeContext::psd[AC3_MAX_CHANNELS][256]

scaled exponents

Definition at line 176 of file ac3dec.c.

Referenced by ac3_parse_audio_block().

int16_t AC3DecodeContext::bndpsd[AC3_MAX_CHANNELS][50]

interpolated exponents

Definition at line 177 of file ac3dec.c.

Referenced by ac3_parse_audio_block().

int16_t AC3DecodeContext::mask[AC3_MAX_CHANNELS][50]

masking curve values

Definition at line 178 of file ac3dec.c.

Referenced by ac3_parse_audio_block().

MDCTContext AC3DecodeContext::imdct_512

for 512 sample IMDCT

Definition at line 183 of file ac3dec.c.

Referenced by ac3_decode_end(), ac3_decode_init(), and do_imdct().

MDCTContext AC3DecodeContext::imdct_256

for 256 sample IMDCT

Definition at line 184 of file ac3dec.c.

Referenced by ac3_decode_end(), ac3_decode_init(), and do_imdct_256().

DSPContext AC3DecodeContext::dsp

for optimization

Definition at line 185 of file ac3dec.c.

Referenced by ac3_decode_init(), ac3_parse_audio_block(), and do_imdct().

float AC3DecodeContext::add_bias

offset for float_to_int16 conversion

Definition at line 186 of file ac3dec.c.

Referenced by ac3_decode_init(), and ac3_parse_audio_block().

float AC3DecodeContext::mul_bias

scaling for float_to_int16 conversion

Definition at line 187 of file ac3dec.c.

Referenced by ac3_decode_init(), and ac3_parse_audio_block().

GetBitContext AC3DecodeContext::gb

bitstream reader

Definition at line 197 of file ac3dec.c.

Referenced by ac3_decode_frame(), ac3_parse_audio_block(), ac3_parse_header(), and get_transform_coeffs_ch().

AVRandomState AC3DecodeContext::dith_state

for dither generation

Definition at line 198 of file ac3dec.c.

Referenced by ac3_decode_init(), and get_transform_coeffs_ch().

AVCodecContext* AC3DecodeContext::avctx

parent context

Definition at line 199 of file ac3dec.c.

Referenced by ac3_decode_init(), ac3_parse_audio_block(), and get_transform_coeffs().

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The documentation for this struct was generated from the following file:

• ac3dec.c