libavcodec/dca.c File Reference

#include <math.h>
#include <stddef.h>
#include <stdio.h>
#include "avcodec.h"
#include "dsputil.h"
#include "bitstream.h"
#include "dcadata.h"
#include "dcahuff.h"
#include "dca.h"

Go to the source code of this file.

Data Structures

struct BitAlloc

Bit allocation. More...

struct DCAContext

Defines

#define DCA_PRIM_CHANNELS_MAX   (5)

#define DCA_SUBBANDS   (32)

#define DCA_ABITS_MAX   (32)

#define DCA_SUBSUBFAMES_MAX   (4)

#define DCA_LFE_MAX   (3)

#define DCA_DOLBY   101

#define DCA_CHANNEL_BITS   6

#define DCA_CHANNEL_MASK   0x3F

#define DCA_LFE   0x80

#define HEADER_SIZE   14

#define DCA_MAX_FRAME_SIZE   16384

#define MIX_REAR1(samples, si1, rs, coef)

#define MIX_REAR2(samples, si1, si2, rs, coef)

#define MIX_FRONT3(samples, coef)

#define DOWNMIX_TO_STEREO(op1, op2)

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 av_cold 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 (const 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, const uint8_t *buf, int buf_size)

Main frame decoding function FIXME add arguments.

static av_cold int dca_decode_init (AVCodecContext *avctx)

DCA initialization.

static av_cold int dca_decode_end (AVCodecContext *avctx)

Variables

static const int64_t dca_core_channel_layout []

static const int8_t dca_lfe_index []

static const int8_t dca_channel_reorder_lfe [][8]

static const int8_t dca_channel_reorder_nolfe [][8]

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 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

Detailed Description

Definition in file dca.c.

Define Documentation

#define DCA_ABITS_MAX (32)

Definition at line 44 of file dca.c.

#define DCA_CHANNEL_BITS 6

Definition at line 136 of file dca.c.

#define DCA_CHANNEL_MASK 0x3F

Definition at line 137 of file dca.c.

Referenced by dca_subframe_header(), and dca_subsubframe().

#define DCA_DOLBY 101

Definition at line 134 of file dca.c.

#define DCA_LFE 0x80

Definition at line 139 of file dca.c.

Referenced by dca_parse_frame_header(), and dca_subsubframe().

#define DCA_LFE_MAX (3)

Definition at line 46 of file dca.c.

#define DCA_MAX_FRAME_SIZE 16384

Definition at line 143 of file dca.c.

Referenced by dca_decode_frame().

#define DCA_PRIM_CHANNELS_MAX (5)

Definition at line 42 of file dca.c.

Referenced by dca_parse_frame_header(), and dca_subsubframe().

#define DCA_SUBBANDS (32)

Definition at line 43 of file dca.c.

Referenced by dca_parse_frame_header(), and dca_subsubframe().

#define DCA_SUBSUBFAMES_MAX (4)

Definition at line 45 of file dca.c.

#define DOWNMIX_TO_STEREO	(	op1,
		op2		)

Value:

for(i = 0; i < 256; i++){ \
        op1 \
        op2 \
    }

Definition at line 843 of file dca.c.

Referenced by dca_downmix().

#define HEADER_SIZE 14

Definition at line 141 of file dca.c.

Referenced by decode_frame(), mp_decode_frame(), msnwc_tcp_probe(), msnwc_tcp_read_header(), and msnwc_tcp_read_packet().

#define MIX_FRONT3	(	samples,
		coef		)

Value:

t = samples[i]; \
    samples[i]     = t * coef[0][0] + samples[i+256] * coef[1][0] + samples[i+512] * coef[2][0]; \
    samples[i+256] = t * coef[0][1] + samples[i+256] * coef[1][1] + samples[i+512] * coef[2][1];

Definition at line 838 of file dca.c.

Referenced by dca_downmix().

#define MIX_REAR1	(	samples,
		si1,
		rs,
		coef	)

Value:

samples[i]     += samples[si1] * coef[rs][0]; \
     samples[i+256] += samples[si1] * coef[rs][1];

Definition at line 830 of file dca.c.

Referenced by dca_downmix().

#define MIX_REAR2	(	samples,
		si1,
		si2,
		rs,
		coef	)

Value:

samples[i]     += samples[si1] * coef[rs][0] + samples[si2] * coef[rs+1][0]; \
     samples[i+256] += samples[si1] * coef[rs][1] + samples[si2] * coef[rs+1][1];

Definition at line 834 of file dca.c.

Referenced by dca_downmix().

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.

Function Documentation

static int dca_convert_bitstream	(	const 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 1168 of file dca.c.

Referenced by dca_decode_frame().

static int dca_decode_block ( DCAContext * s ) [static]

Decode a dca frame block.

Parameters:

s

pointer to the DCAContext

Definition at line 1121 of file dca.c.

Referenced by dca_decode_frame().

static av_cold int dca_decode_end ( AVCodecContext * avctx ) [static]

Definition at line 1320 of file dca.c.

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

Main frame decoding function FIXME add arguments.

Definition at line 1210 of file dca.c.

static av_cold int dca_decode_init ( AVCodecContext * avctx ) [static]

DCA initialization.

Parameters:

avctx

pointer to the AVCodecContext

Definition at line 1287 of file dca.c.

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

Definition at line 849 of file dca.c.

Referenced by dca_subsubframe().

static av_cold void dca_init_vlcs ( void ) [static]

Definition at line 254 of file dca.c.

Referenced by dca_decode_init().

static int dca_parse_frame_header ( DCAContext * s ) [static]

Definition at line 300 of file dca.c.

Referenced by dca_decode_frame().

static int dca_subframe_footer ( DCAContext * s ) [static]

Definition at line 1086 of file dca.c.

Referenced by dca_decode_block().

static int dca_subframe_header ( DCAContext * s ) [static]

Definition at line 477 of file dca.c.

Referenced by dca_decode_block().

static int dca_subsubframe ( DCAContext * s ) [static]

Definition at line 915 of file dca.c.

Referenced by dca_decode_block().

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

Definition at line 894 of file dca.c.

Referenced by dca_subsubframe().

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

Definition at line 294 of file dca.c.

Referenced by dca_parse_frame_header().

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

Definition at line 158 of file dca.c.

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

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

Definition at line 467 of file dca.c.

Referenced by dca_subframe_header().

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 789 of file dca.c.

Referenced by dca_subsubframe().

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 725 of file dca.c.

Referenced by dca_subsubframe().

Variable Documentation

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

Definition at line 913 of file dca.c.

Referenced by dca_subsubframe().

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

Definition at line 912 of file dca.c.

Referenced by dca_subsubframe().

BitAlloc dca_bitalloc_index [static]

indexes for samples VLC select

Definition at line 153 of file dca.c.

const int8_t dca_channel_reorder_lfe[][8] [static]

Initial value:

 {
    { 0, -1, -1, -1, -1, -1, -1, -1},
    { 0,  1, -1, -1, -1, -1, -1, -1},
    { 0,  1, -1, -1, -1, -1, -1, -1},
    { 0,  1, -1, -1, -1, -1, -1, -1},
    { 0,  1, -1, -1, -1, -1, -1, -1},
    { 2,  0,  1, -1, -1, -1, -1, -1},
    { 0,  1,  3, -1, -1, -1, -1, -1},
    { 2,  0,  1,  4, -1, -1, -1, -1},
    { 0,  1,  3,  4, -1, -1, -1, -1},
    { 2,  0,  1,  4,  5, -1, -1, -1},
    { 3,  4,  0,  1,  5,  6, -1, -1},
    { 2,  0,  1,  4,  5,  6, -1, -1},
    { 0,  6,  4,  5,  2,  3, -1, -1},
    { 4,  2,  5,  0,  1,  6,  7, -1},
    { 5,  6,  0,  1,  7,  3,  8,  4},
    { 4,  2,  5,  0,  1,  6,  8,  7},
}

Definition at line 95 of file dca.c.

Referenced by dca_decode_frame().

const int8_t dca_channel_reorder_nolfe[][8] [static]

Initial value:

 {
    { 0, -1, -1, -1, -1, -1, -1, -1},
    { 0,  1, -1, -1, -1, -1, -1, -1},
    { 0,  1, -1, -1, -1, -1, -1, -1},
    { 0,  1, -1, -1, -1, -1, -1, -1},
    { 0,  1, -1, -1, -1, -1, -1, -1},
    { 2,  0,  1, -1, -1, -1, -1, -1},
    { 0,  1,  2, -1, -1, -1, -1, -1},
    { 2,  0,  1,  3, -1, -1, -1, -1},
    { 0,  1,  2,  3, -1, -1, -1, -1},
    { 2,  0,  1,  3,  4, -1, -1, -1},
    { 2,  3,  0,  1,  4,  5, -1, -1},
    { 2,  0,  1,  3,  4,  5, -1, -1},
    { 0,  5,  3,  4,  1,  2, -1, -1},
    { 3,  2,  4,  0,  1,  5,  6, -1},
    { 4,  5,  0,  1,  6,  2,  7,  3},
    { 3,  2,  4,  0,  1,  5,  7,  6},
}

Definition at line 114 of file dca.c.

Referenced by dca_decode_frame().

const int64_t dca_core_channel_layout[] [static]

Initial value:

 {
    CH_FRONT_CENTER,                                               
    CH_LAYOUT_STEREO,                                              
    CH_LAYOUT_STEREO,                                              
    CH_LAYOUT_STEREO,                                              
    CH_LAYOUT_STEREO,                                              
    CH_LAYOUT_STEREO|CH_FRONT_CENTER,                              
    CH_LAYOUT_STEREO|CH_BACK_CENTER,                               
    CH_LAYOUT_STEREO|CH_FRONT_CENTER|CH_BACK_CENTER,               
    CH_LAYOUT_STEREO|CH_SIDE_LEFT|CH_SIDE_RIGHT,                   
    CH_LAYOUT_STEREO|CH_FRONT_CENTER|CH_SIDE_LEFT|CH_SIDE_RIGHT,   
    CH_LAYOUT_STEREO|CH_SIDE_LEFT|CH_SIDE_RIGHT|CH_FRONT_LEFT_OF_CENTER|CH_FRONT_RIGHT_OF_CENTER,                 
    CH_LAYOUT_STEREO|CH_BACK_LEFT|CH_BACK_RIGHT|CH_FRONT_CENTER|CH_BACK_CENTER,                                   
    CH_FRONT_CENTER|CH_FRONT_RIGHT_OF_CENTER|CH_FRONT_LEFT_OF_CENTER|CH_BACK_CENTER|CH_BACK_LEFT|CH_BACK_RIGHT,   
    CH_FRONT_LEFT_OF_CENTER|CH_FRONT_CENTER|CH_FRONT_RIGHT_OF_CENTER|CH_LAYOUT_STEREO|CH_SIDE_LEFT|CH_SIDE_RIGHT, 
    CH_FRONT_LEFT_OF_CENTER|CH_FRONT_RIGHT_OF_CENTER|CH_LAYOUT_STEREO|CH_SIDE_LEFT|CH_SIDE_RIGHT|CH_BACK_LEFT|CH_BACK_RIGHT, 
    CH_FRONT_LEFT_OF_CENTER|CH_FRONT_CENTER|CH_FRONT_RIGHT_OF_CENTER|CH_LAYOUT_STEREO|CH_SIDE_LEFT|CH_BACK_CENTER|CH_SIDE_RIGHT, 
}

Definition at line 72 of file dca.c.

Referenced by dca_decode_frame().

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,
    .close = dca_decode_end,
    .long_name = NULL_IF_CONFIG_SMALL("DCA (DTS Coherent Acoustics)"),
}

Definition at line 1327 of file dca.c.

const int8_t dca_lfe_index[] [static]

Initial value:

 {
    1,2,2,2,2,3,2,3,2,3,2,3,1,3,2,3
}

Definition at line 91 of file dca.c.

Referenced by dca_subsubframe().

BitAlloc dca_scalefactor [static]

scalefactor VLCs

Definition at line 155 of file dca.c.

BitAlloc dca_smpl_bitalloc[11] [static]

samples VLCs

Definition at line 156 of file dca.c.

BitAlloc dca_tmode [static]

transition mode VLCs

Definition at line 154 of file dca.c.


Data Structures
struct	BitAlloc
	Bit allocation. More...
struct	DCAContext
Defines
#define	DCA_PRIM_CHANNELS_MAX (5)
#define	DCA_SUBBANDS (32)
#define	DCA_ABITS_MAX (32)
#define	DCA_SUBSUBFAMES_MAX (4)
#define	DCA_LFE_MAX (3)
#define	DCA_DOLBY 101
#define	DCA_CHANNEL_BITS 6
#define	DCA_CHANNEL_MASK 0x3F
#define	DCA_LFE 0x80
#define	HEADER_SIZE 14
#define	DCA_MAX_FRAME_SIZE 16384
#define	MIX_REAR1(samples, si1, rs, coef)
#define	MIX_REAR2(samples, si1, si2, rs, coef)
#define	MIX_FRONT3(samples, coef)
#define	DOWNMIX_TO_STEREO(op1, op2)
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 av_cold 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 (const 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, const uint8_t buf, int buf_size)
	Main frame decoding function FIXME add arguments.
static av_cold int	dca_decode_init (AVCodecContext *avctx)
	DCA initialization.
static av_cold int	dca_decode_end (AVCodecContext *avctx)
Variables
static const int64_t	dca_core_channel_layout []
static const int8_t	dca_lfe_index []
static const int8_t	dca_channel_reorder_lfe [][8]
static const int8_t	dca_channel_reorder_nolfe [][8]
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 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