DCAContext Struct Reference


Data Fields
AVCodecContext *	avctx
int	frame_type
	type of the current frame
int	samples_deficit
	deficit sample count
int	crc_present
	crc is present in the bitstream
int	sample_blocks
	number of PCM sample blocks
int	frame_size
	primary frame byte size
int	amode
	audio channels arrangement
int	sample_rate
	audio sampling rate
int	bit_rate
	transmission bit rate
int	bit_rate_index
	transmission bit rate index
int	downmix
	embedded downmix enabled
int	dynrange
	embedded dynamic range flag
int	timestamp
	embedded time stamp flag
int	aux_data
	auxiliary data flag
int	hdcd
	source material is mastered in HDCD
int	ext_descr
	extension audio descriptor flag
int	ext_coding
	extended coding flag
int	aspf
	audio sync word insertion flag
int	lfe
	low frequency effects flag
int	predictor_history
	predictor history flag
int	header_crc
	header crc check bytes
int	multirate_inter
	multirate interpolator switch
int	version
	encoder software revision
int	copy_history
	copy history
int	source_pcm_res
	source pcm resolution
int	front_sum
	front sum/difference flag
int	surround_sum
	surround sum/difference flag
int	dialog_norm
	dialog normalisation parameter
int	subframes
	number of subframes
int	is_channels_set
	check for if the channel number is already set
int	total_channels
	number of channels including extensions
int	prim_channels
	number of primary audio channels
int	subband_activity [DCA_PRIM_CHANNELS_MAX]
	subband activity count
int	vq_start_subband [DCA_PRIM_CHANNELS_MAX]
	high frequency vq start subband
int	joint_intensity [DCA_PRIM_CHANNELS_MAX]
	joint intensity coding index
int	transient_huffman [DCA_PRIM_CHANNELS_MAX]
	transient mode code book
int	scalefactor_huffman [DCA_PRIM_CHANNELS_MAX]
	scale factor code book
int	bitalloc_huffman [DCA_PRIM_CHANNELS_MAX]
	bit allocation quantizer select
int	quant_index_huffman [DCA_PRIM_CHANNELS_MAX][DCA_ABITS_MAX]
	quantization index codebook select
float	scalefactor_adj [DCA_PRIM_CHANNELS_MAX][DCA_ABITS_MAX]
	scale factor adjustment
int	subsubframes [DCA_SUBFRAMES_MAX]
	number of subsubframes
int	partial_samples [DCA_SUBFRAMES_MAX]
	partial subsubframe samples count
int	prediction_mode [DCA_PRIM_CHANNELS_MAX][DCA_SUBBANDS]
	prediction mode (ADPCM used or not)
int	prediction_vq [DCA_PRIM_CHANNELS_MAX][DCA_SUBBANDS]
	prediction VQ coefs
int	bitalloc [DCA_PRIM_CHANNELS_MAX][DCA_SUBBANDS]
	bit allocation index
int	transition_mode [DCA_PRIM_CHANNELS_MAX][DCA_SUBBANDS]
	transition mode (transients)
int	scale_factor [DCA_PRIM_CHANNELS_MAX][DCA_SUBBANDS][2]
	scale factors (2 if transient)
int	joint_huff [DCA_PRIM_CHANNELS_MAX]
	joint subband scale factors codebook
int	joint_scale_factor [DCA_PRIM_CHANNELS_MAX][DCA_SUBBANDS]
	joint subband scale factors
int	downmix_coef [DCA_PRIM_CHANNELS_MAX][2]
	stereo downmix coefficients
int	dynrange_coef
	dynamic range coefficient
int	high_freq_vq [DCA_PRIM_CHANNELS_MAX][DCA_SUBBANDS]
	VQ encoded high frequency subbands.
float	lfe_data [2 DCA_LFE_MAX (DCA_BLOCKS_MAX+4)]
	Low frequency effect data.
int	lfe_scale_factor
float	subband_samples_hist [DCA_PRIM_CHANNELS_MAX][DCA_SUBBANDS][4]
float	subband_fir_hist [DCA_PRIM_CHANNELS_MAX][512]
float	subband_fir_noidea [DCA_PRIM_CHANNELS_MAX][32]
int	hist_index [DCA_PRIM_CHANNELS_MAX]
float	raXin [32]
int	output
	type of output
float	scale_bias
	output scale
float	subband_samples [DCA_BLOCKS_MAX][DCA_PRIM_CHANNELS_MAX][DCA_SUBBANDS][8]
float	samples [(DCA_PRIM_CHANNELS_MAX+1)*256]
const float *	samples_chanptr [DCA_PRIM_CHANNELS_MAX+1]
uint8_t	dca_buffer [DCA_MAX_FRAME_SIZE+DCA_MAX_EXSS_HEADER_SIZE+DCA_BUFFER_PADDING_SIZE]
int	dca_buffer_size
	how much data is in the dca_buffer
const int8_t *	channel_order_tab
	channel reordering table, lfe and non lfe
GetBitContext	gb
int	current_subframe
int	current_subsubframe
int	core_ext_mask
	present extensions in the core substream
int	xch_present
	XCh extension present and valid.
int	xch_base_channel
	index of first (only) channel containing XCH data
int	static_fields
	static fields present
int	mix_metadata
	mixing metadata present
int	num_mix_configs
	number of mix out configurations
int	mix_config_num_ch [4]
	number of channels in each mix out configuration
int	profile
int	debug_flag
	used for suppressing repeated error messages output
DSPContext	dsp
FFTContext	imdct
SynthFilterContext	synth
DCADSPContext	dcadsp
FmtConvertContext	fmt_conv
PutBitContext	pb
int32_t	history [MAX_CHANNELS][512]
int	start [MAX_CHANNELS]
int	lfe_channel
int	sample_rate_code
int	lfe_data [SUBFRAMES SUBSUBFRAMES 4]
int	a_mode
	audio channels arrangement
int	num_channel
int	lfe_state
int	lfe_offset
int32_t	pcm [FFMAX(LFE_INTERPOLATION, DCA_SUBBANDS_32)]
int32_t	subband [PCM_SAMPLES][MAX_CHANNELS][DCA_SUBBANDS_32]