dca.c File Reference

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Detailed Description

Definition in file dca.c.

Go to the source code of this file.

Classes
struct	BitAlloc
	Bit allocation. More...
struct	DCAContext
Enumerations
enum	DCAMode {   DCA_MONO = 0, DCA_CHANNEL, DCA_STEREO, DCA_STEREO_SUMDIFF,   DCA_STEREO_TOTAL, DCA_3F, DCA_2F1R, DCA_3F1R,   DCA_2F2R, DCA_3F2R, DCA_4F2R }
Functions
static av_always_inline int	get_bitalloc (GetBitContext *gb, BitAlloc *ba, int idx)
static void	dca_init_vlcs (void)
static void	get_array (GetBitContext *gb, int *dst, int len, int bits)
static int	dca_parse_frame_header (DCAContext *s)
static int	get_scale (GetBitContext *gb, int level, int value)
static int	dca_subframe_header (DCAContext *s)
static void	qmf_32_subbands (DCAContext *s, int chans, float samples_in[32][8], float *samples_out, float scale, float bias)
static void	lfe_interpolation_fir (int decimation_select, int num_deci_sample, float *samples_in, float *samples_out, float scale, float bias)
static void	dca_downmix (float *samples, int srcfmt, int downmix_coef[DCA_PRIM_CHANNELS_MAX][2])
static int	decode_blockcode (int code, int levels, int *values)
static int	dca_subsubframe (DCAContext *s)
static int	dca_subframe_footer (DCAContext *s)
static int	dca_decode_block (DCAContext *s)
	Decode a dca frame block.
static int	dca_convert_bitstream (uint8_t *src, int src_size, uint8_t *dst, int max_size)
	Convert bitstream to one representation based on sync marker.
static int	dca_decode_frame (AVCodecContext *avctx, void *data, int *data_size, uint8_t *buf, int buf_size)
	Main frame decoding function FIXME add arguments.
static void	pre_calc_cosmod (DCAContext *s)
	Build the cosine modulation tables for the QMF.
static int	dca_decode_init (AVCodecContext *avctx)
	DCA initialization.
Variables
static BitAlloc	dca_bitalloc_index
	indexes for samples VLC select
static BitAlloc	dca_tmode
	transition mode VLCs
static BitAlloc	dca_scalefactor
	scalefactor VLCs
static BitAlloc	dca_smpl_bitalloc [11]
	samples VLCs
static float	cos_mod [544]
	Pre-calculated cosine modulation coefs for the QMF.
static const uint8_t	abits_sizes [7] = { 7, 10, 12, 13, 15, 17, 19 }
static const uint8_t	abits_levels [7] = { 3, 5, 7, 9, 13, 17, 25 }
AVCodec	dca_decoder

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Enumeration Type Documentation

enum DCAMode

Enumerator:

DCA_MONO
DCA_CHANNEL
DCA_STEREO
DCA_STEREO_SUMDIFF
DCA_STEREO_TOTAL
DCA_3F
DCA_2F1R
DCA_3F1R
DCA_2F2R
DCA_3F2R
DCA_4F2R

Definition at line 48 of file dca.c.

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Function Documentation

static av_always_inline int get_bitalloc	(	GetBitContext *	gb,
		BitAlloc *	ba,
		int	idx
	)			[static]

Definition at line 90 of file dca.c.

Referenced by dca_subframe_header(), dca_subsubframe(), and get_scale().

static void dca_init_vlcs

(

void

)

[static]

Definition at line 180 of file dca.c.

Referenced by dca_decode_init().

static void get_array	(	GetBitContext *	gb,
		int *	dst,
		int	len,
		int	bits
	)			[inline, static]

Definition at line 220 of file dca.c.

Referenced by dca_parse_frame_header().

static int dca_parse_frame_header

(

DCAContext *

s

)

[static]

Definition at line 226 of file dca.c.

Referenced by dca_decode_frame().

static int get_scale	(	GetBitContext *	gb,
		int	level,
		int	value
	)			[inline, static]

Definition at line 391 of file dca.c.

Referenced by dca_subframe_header().

static int dca_subframe_header

(

DCAContext *

s

)

[static]

Definition at line 401 of file dca.c.

Referenced by dca_decode_block().

static void qmf_32_subbands	(	DCAContext *	s,
		int	chans,
		float	samples_in[32][8],
		float *	samples_out,
		float	scale,
		float	bias
	)			[static]

Definition at line 645 of file dca.c.

Referenced by dca_subsubframe().

static void lfe_interpolation_fir	(	int	decimation_select,
		int	num_deci_sample,
		float *	samples_in,
		float *	samples_out,
		float	scale,
		float	bias
	)			[static]

Definition at line 714 of file dca.c.

Referenced by dca_subsubframe().

static void dca_downmix	(	float *	samples,
		int	srcfmt,
		int	downmix_coef[DCA_PRIM_CHANNELS_MAX][2]
	)			[static]

Definition at line 774 of file dca.c.

Referenced by dca_subsubframe().

static int decode_blockcode	(	int	code,
		int	levels,
		int *	values
	)			[static]

Definition at line 819 of file dca.c.

Referenced by dca_subsubframe().

static int dca_subsubframe

(

DCAContext *

s

)

[static]

Definition at line 840 of file dca.c.

Referenced by dca_decode_block().

static int dca_subframe_footer

(

DCAContext *

s

)

[static]

Definition at line 1012 of file dca.c.

Referenced by dca_decode_block().

static int dca_decode_block

(

DCAContext *

s

)

[static]

Decode a dca frame block.

Parameters:

s

pointer to the DCAContext

Definition at line 1047 of file dca.c.

Referenced by dca_decode_frame().

static int dca_convert_bitstream	(	uint8_t *	src,
		int	src_size,
		uint8_t *	dst,
		int	max_size
	)			[static]

Convert bitstream to one representation based on sync marker.

Definition at line 1094 of file dca.c.

Referenced by dca_decode_frame().

static int dca_decode_frame	(	AVCodecContext *	avctx,
		void *	data,
		int *	data_size,
		uint8_t *	buf,
		int	buf_size
	)			[static]

Main frame decoding function FIXME add arguments.

Definition at line 1134 of file dca.c.

static void pre_calc_cosmod

(

DCAContext *

s

)

[static]

Build the cosine modulation tables for the QMF.

Parameters:

s

pointer to the DCAContext

Definition at line 1211 of file dca.c.

Referenced by dca_decode_init().

static int dca_decode_init

(

AVCodecContext *

avctx

)

[static]

DCA initialization.

Parameters:

avctx

pointer to the AVCodecContext

Definition at line 1241 of file dca.c.

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Variable Documentation

BitAlloc dca_bitalloc_index [static]

indexes for samples VLC select

Definition at line 82 of file dca.c.

BitAlloc dca_tmode [static]

transition mode VLCs

Definition at line 83 of file dca.c.

BitAlloc dca_scalefactor [static]

scalefactor VLCs

Definition at line 84 of file dca.c.

BitAlloc dca_smpl_bitalloc[11] [static]

samples VLCs

Definition at line 85 of file dca.c.

float cos_mod[544] [static]

Pre-calculated cosine modulation coefs for the QMF.

Definition at line 88 of file dca.c.

Referenced by pre_calc_cosmod(), and qmf_32_subbands().

const uint8_t abits_sizes[7] = { 7, 10, 12, 13, 15, 17, 19 } [static]

Definition at line 837 of file dca.c.

Referenced by dca_subsubframe().

const uint8_t abits_levels[7] = { 3, 5, 7, 9, 13, 17, 25 } [static]

Definition at line 838 of file dca.c.

Referenced by dca_subsubframe().

AVCodec dca_decoder

Initial value:

 {
    .name = "dca",
    .type = CODEC_TYPE_AUDIO,
    .id = CODEC_ID_DTS,
    .priv_data_size = sizeof(DCAContext),
    .init = dca_decode_init,
    .decode = dca_decode_frame,
}

Definition at line 1254 of file dca.c.