AC3DecodeContext Struct Reference


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
Data Fields
int	channel_mode
	channel mode (acmod)
int	block_switch [AC3_MAX_CHANNELS]
	block switch flags
int	dither_flag [AC3_MAX_CHANNELS]
	dither flags
int	dither_all
	true if all channels are dithered
int	cpl_in_use
	coupling in use
int	channel_in_cpl [AC3_MAX_CHANNELS]
	channel in coupling
int	phase_flags_in_use
	phase flags in use
int	phase_flags [18]
	phase flags
int	cpl_band_struct [18]
	coupling band structure
int	num_rematrixing_bands
	number of rematrixing bands
int	rematrixing_flags [4]
	rematrixing flags
int	exp_strategy [AC3_MAX_CHANNELS]
	exponent strategies
int	snr_offset [AC3_MAX_CHANNELS]
	signal-to-noise ratio offsets
int	fast_gain [AC3_MAX_CHANNELS]
	fast gain values (signal-to-mask ratio)
int	dba_mode [AC3_MAX_CHANNELS]
	delta bit allocation mode
int	dba_nsegs [AC3_MAX_CHANNELS]
	number of delta segments
uint8_t	dba_offsets [AC3_MAX_CHANNELS][8]
	delta segment offsets
uint8_t	dba_lengths [AC3_MAX_CHANNELS][8]
	delta segment lengths
uint8_t	dba_values [AC3_MAX_CHANNELS][8]
	delta values for each segment
int	sample_rate
	sample frequency, in Hz
int	bit_rate
	stream bit rate, in bits-per-second
int	frame_size
	current frame size, in bytes
int	channels
	number of total channels
int	fbw_channels
	number of full-bandwidth channels
int	lfe_on
	lfe channel in use
int	lfe_ch
	index of LFE channel
int	output_mode
	output channel configuration
int	out_channels
	number of output channels
int	center_mix_level
	Center mix level index.
int	surround_mix_level
	Surround mix level index.
float	downmix_coeffs [AC3_MAX_CHANNELS][2]
	stereo downmix coefficients
float	dynamic_range [2]
	dynamic range
float	cpl_coords [AC3_MAX_CHANNELS][18]
	coupling coordinates
int	num_cpl_bands
	number of coupling bands
int	num_cpl_subbands
	number of coupling sub bands
int	start_freq [AC3_MAX_CHANNELS]
	start frequency bin
int	end_freq [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	band_psd [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	gbc
	bitstream reader
AVRandomState	dith_state
	for dither generation
AVCodecContext *	avctx
	parent context