dca_lbr.c File Reference

#include "libavutil/channel_layout.h"
#include "libavutil/mem.h"
#include "libavutil/mem_internal.h"
#include "dcadec.h"
#include "dcadata.h"
#include "dcahuff.h"
#include "dca_syncwords.h"
#include "bytestream.h"
#include "decode.h"

Go to the source code of this file.

Data Structures
struct	LBRChunk

Macros
#define	BITSTREAM_READER_LE
#define	AMP_MAX   56

Enumerations
enum	LBRFlags {   LBR_FLAG_24_BIT = 0x01, LBR_FLAG_LFE_PRESENT = 0x02, LBR_FLAG_BAND_LIMIT_2_3 = 0x04, LBR_FLAG_BAND_LIMIT_1_2 = 0x08,   LBR_FLAG_BAND_LIMIT_1_3 = 0x0c, LBR_FLAG_BAND_LIMIT_1_4 = 0x10, LBR_FLAG_BAND_LIMIT_1_8 = 0x18, LBR_FLAG_BAND_LIMIT_NONE = 0x14,   LBR_FLAG_BAND_LIMIT_MASK = 0x1c, LBR_FLAG_DMIX_STEREO = 0x20, LBR_FLAG_DMIX_MULTI_CH = 0x40 }
enum	LBRChunkTypes {   LBR_CHUNK_NULL = 0x00, LBR_CHUNK_PAD = 0x01, LBR_CHUNK_FRAME = 0x04, LBR_CHUNK_FRAME_NO_CSUM = 0x06,   LBR_CHUNK_LFE = 0x0a, LBR_CHUNK_ECS = 0x0b, LBR_CHUNK_RESERVED_1 = 0x0c, LBR_CHUNK_RESERVED_2 = 0x0d,   LBR_CHUNK_SCF = 0x0e, LBR_CHUNK_TONAL = 0x10, LBR_CHUNK_TONAL_GRP_1 = 0x11, LBR_CHUNK_TONAL_GRP_2 = 0x12,   LBR_CHUNK_TONAL_GRP_3 = 0x13, LBR_CHUNK_TONAL_GRP_4 = 0x14, LBR_CHUNK_TONAL_GRP_5 = 0x15, LBR_CHUNK_TONAL_SCF = 0x16,   LBR_CHUNK_TONAL_SCF_GRP_1 = 0x17, LBR_CHUNK_TONAL_SCF_GRP_2 = 0x18, LBR_CHUNK_TONAL_SCF_GRP_3 = 0x19, LBR_CHUNK_TONAL_SCF_GRP_4 = 0x1a,   LBR_CHUNK_TONAL_SCF_GRP_5 = 0x1b, LBR_CHUNK_RES_GRID_LR = 0x30, LBR_CHUNK_RES_GRID_LR_LAST = 0x3f, LBR_CHUNK_RES_GRID_HR = 0x40,   LBR_CHUNK_RES_GRID_HR_LAST = 0x4f, LBR_CHUNK_RES_TS_1 = 0x50, LBR_CHUNK_RES_TS_1_LAST = 0x5f, LBR_CHUNK_RES_TS_2 = 0x60,   LBR_CHUNK_RES_TS_2_LAST = 0x6f, LBR_CHUNK_EXTENSION = 0x7f }

Functions
av_cold void	ff_dca_lbr_init_tables (void)
static int	parse_lfe_24 (DCALbrDecoder *s)
static int	parse_lfe_16 (DCALbrDecoder *s)
static int	parse_lfe_chunk (DCALbrDecoder *s, LBRChunk *chunk)
static int	parse_vlc (GetBitContext *s, const VLC *vlc, int nb_bits, int max_depth)
static int	parse_tonal (DCALbrDecoder *s, int group)
static int	parse_tonal_chunk (DCALbrDecoder *s, LBRChunk *chunk)
static int	parse_tonal_group (DCALbrDecoder *s, LBRChunk *chunk)
static int	ensure_bits (GetBitContext *s, int n)
	Check point to ensure that enough bits are left. More...
static int	parse_scale_factors (DCALbrDecoder *s, uint8_t *scf)
static int	parse_st_code (GetBitContext *s, int min_v)
static int	parse_grid_1_chunk (DCALbrDecoder *s, LBRChunk *chunk, int ch1, int ch2)
static int	parse_grid_1_sec_ch (DCALbrDecoder *s, int ch2)
static void	parse_grid_3 (DCALbrDecoder *s, int ch1, int ch2, int sb, int flag)
static float	lbr_rand (DCALbrDecoder *s, int sb)
static void	parse_ch (DCALbrDecoder *s, int ch, int sb, int quant_level, int flag)
	Parse time samples for one subband, filling truncated samples with randomness. More...
static int	parse_ts (DCALbrDecoder *s, int ch1, int ch2, int start_sb, int end_sb, int flag)
static void	convert_lpc (float *coeff, const int *codes)
	Convert from reflection coefficients to direct form coefficients. More...
static int	parse_lpc (DCALbrDecoder *s, int ch1, int ch2, int start_sb, int end_sb)
static int	parse_high_res_grid (DCALbrDecoder *s, LBRChunk *chunk, int ch1, int ch2)
static int	parse_grid_2 (DCALbrDecoder *s, int ch1, int ch2, int start_sb, int end_sb, int flag)
static int	parse_ts1_chunk (DCALbrDecoder *s, LBRChunk *chunk, int ch1, int ch2)
static int	parse_ts2_chunk (DCALbrDecoder *s, LBRChunk *chunk, int ch1, int ch2)
static int	init_sample_rate (DCALbrDecoder *s)
static int	alloc_sample_buffer (DCALbrDecoder *s)
static int	parse_decoder_init (DCALbrDecoder *s, GetByteContext *gb)
int	ff_dca_lbr_parse (DCALbrDecoder *s, const uint8_t *data, DCAExssAsset *asset)
static void	decode_grid (DCALbrDecoder *s, int ch1, int ch2)
	Reconstruct high-frequency resolution grid from first and third grids. More...
static void	random_ts (DCALbrDecoder *s, int ch1, int ch2)
	Fill unallocated subbands with randomness. More...
static void	predict (float *samples, const float *coeff, int nsamples)
static void	synth_lpc (DCALbrDecoder *s, int ch1, int ch2, int sb)
static void	filter_ts (DCALbrDecoder *s, int ch1, int ch2)
static void	decode_part_stereo (DCALbrDecoder *s, int ch1, int ch2)
	Modulate by interpolated partial stereo coefficients. More...
static void	synth_tones (DCALbrDecoder *s, int ch, float *values, int group, int group_sf, int synth_idx)
	Synthesise tones in the given group for the given tonal subframe. More...
static void	base_func_synth (DCALbrDecoder *s, int ch, float *values, int sf)
	Synthesise all tones in all groups for the given residual subframe. More...
static void	transform_channel (DCALbrDecoder *s, int ch, float *output)
int	ff_dca_lbr_filter_frame (DCALbrDecoder *s, AVFrame *frame)
av_cold void	ff_dca_lbr_flush (DCALbrDecoder *s)
av_cold int	ff_dca_lbr_init (DCALbrDecoder *s)
av_cold void	ff_dca_lbr_close (DCALbrDecoder *s)

Variables
static const int8_t	channel_reorder_nolfe [7][5]
static const int8_t	channel_reorder_lfe [7][5]
static const uint8_t	lfe_index [7]
static const uint16_t	channel_layouts [7]
static float	cos_tab [256]
static const float	lpc_tab [16]

Macro Definition Documentation

BITSTREAM_READER_LE

#define BITSTREAM_READER_LE

Definition at line 21 of file dca_lbr.c.

AMP_MAX

#define AMP_MAX   56

Definition at line 34 of file dca_lbr.c.

Enumeration Type Documentation

LBRFlags

enum LBRFlags

Enumerator
LBR_FLAG_24_BIT
LBR_FLAG_LFE_PRESENT
LBR_FLAG_BAND_LIMIT_2_3
LBR_FLAG_BAND_LIMIT_1_2
LBR_FLAG_BAND_LIMIT_1_3
LBR_FLAG_BAND_LIMIT_1_4
LBR_FLAG_BAND_LIMIT_1_8
LBR_FLAG_BAND_LIMIT_NONE
LBR_FLAG_BAND_LIMIT_MASK
LBR_FLAG_DMIX_STEREO
LBR_FLAG_DMIX_MULTI_CH

Definition at line 36 of file dca_lbr.c.

LBRChunkTypes

enum LBRChunkTypes

Enumerator
LBR_CHUNK_NULL
LBR_CHUNK_PAD
LBR_CHUNK_FRAME
LBR_CHUNK_FRAME_NO_CSUM
LBR_CHUNK_LFE
LBR_CHUNK_ECS
LBR_CHUNK_RESERVED_1
LBR_CHUNK_RESERVED_2
LBR_CHUNK_SCF
LBR_CHUNK_TONAL
LBR_CHUNK_TONAL_GRP_1
LBR_CHUNK_TONAL_GRP_2
LBR_CHUNK_TONAL_GRP_3
LBR_CHUNK_TONAL_GRP_4
LBR_CHUNK_TONAL_GRP_5
LBR_CHUNK_TONAL_SCF
LBR_CHUNK_TONAL_SCF_GRP_1
LBR_CHUNK_TONAL_SCF_GRP_2
LBR_CHUNK_TONAL_SCF_GRP_3
LBR_CHUNK_TONAL_SCF_GRP_4
LBR_CHUNK_TONAL_SCF_GRP_5
LBR_CHUNK_RES_GRID_LR
LBR_CHUNK_RES_GRID_LR_LAST
LBR_CHUNK_RES_GRID_HR
LBR_CHUNK_RES_GRID_HR_LAST
LBR_CHUNK_RES_TS_1
LBR_CHUNK_RES_TS_1_LAST
LBR_CHUNK_RES_TS_2
LBR_CHUNK_RES_TS_2_LAST
LBR_CHUNK_EXTENSION

Definition at line 50 of file dca_lbr.c.

Function Documentation

ff_dca_lbr_init_tables()

av_cold void ff_dca_lbr_init_tables

(

void

)

Definition at line 135 of file dca_lbr.c.

Referenced by dcadec_init_static().

parse_lfe_24()

static int parse_lfe_24 ( DCALbrDecoder *  s )

static

Definition at line 143 of file dca_lbr.c.

Referenced by parse_lfe_chunk().

parse_lfe_16()

static int parse_lfe_16 ( DCALbrDecoder *  s )

static

Definition at line 197 of file dca_lbr.c.

Referenced by parse_lfe_chunk().

parse_lfe_chunk()

static int parse_lfe_chunk ( DCALbrDecoder *  s, LBRChunk *  chunk  )

static

Definition at line 247 of file dca_lbr.c.

Referenced by ff_dca_lbr_parse().

parse_vlc()

static int parse_vlc ( GetBitContext *  s, const VLC *  vlc, int  nb_bits, int  max_depth  )

inlinestatic

Definition at line 271 of file dca_lbr.c.

Referenced by parse_grid_1_chunk(), parse_grid_1_sec_ch(), parse_grid_2(), parse_grid_3(), parse_scale_factors(), parse_st_code(), and parse_tonal().

parse_tonal()

static int parse_tonal ( DCALbrDecoder *  s, int  group  )

static

Definition at line 281 of file dca_lbr.c.

Referenced by parse_tonal_chunk(), and parse_tonal_group().

parse_tonal_chunk()

static int parse_tonal_chunk ( DCALbrDecoder *  s, LBRChunk *  chunk  )

static

Definition at line 363 of file dca_lbr.c.

Referenced by ff_dca_lbr_parse().

parse_tonal_group()

static int parse_tonal_group ( DCALbrDecoder *  s, LBRChunk *  chunk  )

static

Definition at line 396 of file dca_lbr.c.

Referenced by ff_dca_lbr_parse().

ensure_bits()

static int ensure_bits ( GetBitContext *  s, int  n  )

static

Check point to ensure that enough bits are left.

Aborts decoding by skipping to the end of chunk otherwise.

Definition at line 414 of file dca_lbr.c.

Referenced by parse_ch(), parse_grid_1_chunk(), parse_grid_1_sec_ch(), parse_grid_2(), parse_grid_3(), parse_lpc(), parse_scale_factors(), and parse_ts().

parse_scale_factors()

static int parse_scale_factors ( DCALbrDecoder *  s, uint8_t *  scf  )

static

Definition at line 426 of file dca_lbr.c.

Referenced by parse_grid_1_chunk(), parse_grid_1_sec_ch(), and parse_high_res_grid().

parse_st_code()

static int parse_st_code ( GetBitContext *  s, int  min_v  )

static

Definition at line 496 of file dca_lbr.c.

Referenced by parse_grid_1_chunk().

parse_grid_1_chunk()

static int parse_grid_1_chunk ( DCALbrDecoder *  s, LBRChunk *  chunk, int  ch1, int  ch2  )

static

Definition at line 510 of file dca_lbr.c.

Referenced by ff_dca_lbr_parse().

parse_grid_1_sec_ch()

static int parse_grid_1_sec_ch ( DCALbrDecoder *  s, int  ch2  )

static

Definition at line 578 of file dca_lbr.c.

Referenced by parse_ts2_chunk().

parse_grid_3()

static void parse_grid_3 ( DCALbrDecoder *  s, int  ch1, int  ch2, int  sb, int  flag  )

static

Definition at line 604 of file dca_lbr.c.

Referenced by parse_ts().

lbr_rand()

static float lbr_rand ( DCALbrDecoder *  s, int  sb  )

static

Definition at line 626 of file dca_lbr.c.

Referenced by parse_ch(), and random_ts().

parse_ch()

static void parse_ch ( DCALbrDecoder *  s, int  ch, int  sb, int  quant_level, int  flag  )

static

Parse time samples for one subband, filling truncated samples with randomness.

Definition at line 635 of file dca_lbr.c.

Referenced by parse_ts().

parse_ts()

static int parse_ts ( DCALbrDecoder *  s, int  ch1, int  ch2, int  start_sb, int  end_sb, int  flag  )

static

Definition at line 709 of file dca_lbr.c.

Referenced by parse_high_res_grid(), parse_ts1_chunk(), and parse_ts2_chunk().

convert_lpc()

static void convert_lpc ( float *  coeff, const int *  codes  )

static

Convert from reflection coefficients to direct form coefficients.

Definition at line 772 of file dca_lbr.c.

Referenced by parse_lpc().

parse_lpc()

static int parse_lpc ( DCALbrDecoder *  s, int  ch1, int  ch2, int  start_sb, int  end_sb  )

static

Definition at line 788 of file dca_lbr.c.

Referenced by parse_high_res_grid(), and parse_ts1_chunk().

parse_high_res_grid()

static int parse_high_res_grid ( DCALbrDecoder *  s, LBRChunk *  chunk, int  ch1, int  ch2  )

static

Definition at line 809 of file dca_lbr.c.

Referenced by ff_dca_lbr_parse().

parse_grid_2()

static int parse_grid_2 ( DCALbrDecoder *  s, int  ch1, int  ch2, int  start_sb, int  end_sb, int  flag  )

static

Definition at line 871 of file dca_lbr.c.

Referenced by parse_ts1_chunk(), and parse_ts2_chunk().

parse_ts1_chunk()

static int parse_ts1_chunk ( DCALbrDecoder *  s, LBRChunk *  chunk, int  ch1, int  ch2  )

static

Definition at line 913 of file dca_lbr.c.

Referenced by ff_dca_lbr_parse().

parse_ts2_chunk()

static int parse_ts2_chunk ( DCALbrDecoder *  s, LBRChunk *  chunk, int  ch1, int  ch2  )

static

Definition at line 931 of file dca_lbr.c.

Referenced by ff_dca_lbr_parse().

init_sample_rate()

static int init_sample_rate ( DCALbrDecoder *  s )

static

Definition at line 954 of file dca_lbr.c.

Referenced by parse_decoder_init().

alloc_sample_buffer()

static int alloc_sample_buffer ( DCALbrDecoder *  s )

static

Definition at line 994 of file dca_lbr.c.

Referenced by parse_decoder_init().

parse_decoder_init()

static int parse_decoder_init ( DCALbrDecoder *  s, GetByteContext *  gb  )

static

Definition at line 1018 of file dca_lbr.c.

Referenced by ff_dca_lbr_parse().

ff_dca_lbr_parse()

int ff_dca_lbr_parse	(	DCALbrDecoder *	s,
		const uint8_t *	data,
		DCAExssAsset *	asset
	)

Definition at line 1170 of file dca_lbr.c.

Referenced by dcadec_decode_frame().

decode_grid()

static void decode_grid ( DCALbrDecoder *  s, int  ch1, int  ch2  )

static

Reconstruct high-frequency resolution grid from first and third grids.

Definition at line 1407 of file dca_lbr.c.

Referenced by ff_dca_lbr_filter_frame().

random_ts()

static void random_ts ( DCALbrDecoder *  s, int  ch1, int  ch2  )

static

Fill unallocated subbands with randomness.

Definition at line 1444 of file dca_lbr.c.

Referenced by ff_dca_lbr_filter_frame().

predict()

static void predict ( float *  samples, const float *  coeff, int  nsamples  )

static

Definition at line 1480 of file dca_lbr.c.

Referenced by synth_lpc().

synth_lpc()

static void synth_lpc ( DCALbrDecoder *  s, int  ch1, int  ch2, int  sb  )

static

Definition at line 1492 of file dca_lbr.c.

Referenced by filter_ts().

filter_ts()

static void filter_ts ( DCALbrDecoder *  s, int  ch1, int  ch2  )

static

Definition at line 1514 of file dca_lbr.c.

Referenced by ff_dca_lbr_filter_frame().

decode_part_stereo()

static void decode_part_stereo ( DCALbrDecoder *  s, int  ch1, int  ch2  )

static

Modulate by interpolated partial stereo coefficients.

Definition at line 1599 of file dca_lbr.c.

Referenced by ff_dca_lbr_filter_frame().

synth_tones()

static void synth_tones ( DCALbrDecoder *  s, int  ch, float *  values, int  group, int  group_sf, int  synth_idx  )

static

Synthesise tones in the given group for the given tonal subframe.

Definition at line 1625 of file dca_lbr.c.

Referenced by base_func_synth().

base_func_synth()

static void base_func_synth ( DCALbrDecoder *  s, int  ch, float *  values, int  sf  )

static

Synthesise all tones in all groups for the given residual subframe.

Definition at line 1689 of file dca_lbr.c.

Referenced by transform_channel().

transform_channel()

static void transform_channel ( DCALbrDecoder *  s, int  ch, float *  output  )

static

Definition at line 1703 of file dca_lbr.c.

Referenced by ff_dca_lbr_filter_frame().

ff_dca_lbr_filter_frame()

int ff_dca_lbr_filter_frame	(	DCALbrDecoder *	s,
		AVFrame *	frame
	)

Definition at line 1737 of file dca_lbr.c.

Referenced by dcadec_decode_frame().

ff_dca_lbr_flush()

av_cold void ff_dca_lbr_flush

(

DCALbrDecoder *

s

)

Definition at line 1799 of file dca_lbr.c.

Referenced by dcadec_flush(), and parse_decoder_init().

ff_dca_lbr_init()

av_cold int ff_dca_lbr_init

(

DCALbrDecoder *

s

)

Definition at line 1823 of file dca_lbr.c.

Referenced by dcadec_init().

ff_dca_lbr_close()

av_cold void ff_dca_lbr_close

(

DCALbrDecoder *

s

)

Definition at line 1832 of file dca_lbr.c.

Referenced by dcadec_close().

Variable Documentation

channel_reorder_nolfe

const int8_t channel_reorder_nolfe[7][5]

static

Initial value:

= {
    { 0, -1, -1, -1, -1 },  
    { 0,  1, -1, -1, -1 },  
    { 0,  1,  2, -1, -1 },  
    { 0,  1, -1, -1, -1 },  
    { 1,  2,  0, -1, -1 },  
    { 0,  1,  2,  3, -1 },  
    { 0,  1,  3,  4,  2 },  
}

Definition at line 88 of file dca_lbr.c.

Referenced by encode_init(), and ff_dca_lbr_filter_frame().

channel_reorder_lfe

const int8_t channel_reorder_lfe[7][5]

static

Initial value:

= {
    { 0, -1, -1, -1, -1 },  
    { 0,  1, -1, -1, -1 },  
    { 0,  1,  2, -1, -1 },  
    { 1,  2, -1, -1, -1 },  
    { 2,  3,  0, -1, -1 },  
    { 0,  1,  3,  4, -1 },  
    { 0,  1,  4,  5,  2 },  
}

Definition at line 98 of file dca_lbr.c.

Referenced by encode_init(), and ff_dca_lbr_filter_frame().

lfe_index

const uint8_t lfe_index[7]

static

Initial value:

= {
    1, 2, 3, 0, 1, 2, 3
}

Definition at line 108 of file dca_lbr.c.

Referenced by ff_dca_lbr_filter_frame(), and lfe_downsample().

channel_layouts

const uint16_t channel_layouts[7]

static

Initial value:

= {
    AV_CH_LAYOUT_MONO,
    AV_CH_LAYOUT_STEREO,
    AV_CH_LAYOUT_SURROUND,
    AV_CH_SIDE_LEFT | AV_CH_SIDE_RIGHT,
    AV_CH_FRONT_CENTER | AV_CH_SIDE_LEFT | AV_CH_SIDE_RIGHT,
    AV_CH_LAYOUT_2_2,
    AV_CH_LAYOUT_5POINT0
}

Definition at line 112 of file dca_lbr.c.

Referenced by aeval_query_formats(), channelmap_query_formats(), ff_add_channel_layout(), ff_channel_layouts_unref(), ff_dca_lbr_filter_frame(), ff_set_common_channel_layouts(), ff_set_common_channel_layouts2(), init_audio(), join_query_formats(), main(), merge_channel_layouts_internal(), pcm_bluray_parse_header(), and query_formats().

cos_tab

float cos_tab[256]

static

Definition at line 122 of file dca_lbr.c.

Referenced by eval_lpcenv_or_interp(), ff_dca_lbr_init_tables(), get_cos(), and synth_tones().

lpc_tab

const float lpc_tab[16]

static

Initial value:

= {
    
    -0.995734176295034521871191178905, -0.961825643172819070408796290732,
    -0.895163291355062322067016499754, -0.798017227280239503332805112796,
    -0.673695643646557211712691912426, -0.526432162877355800244607799141,
    -0.361241666187152948744714596184, -0.183749517816570331574408839621,
     0.0,                               0.207911690817759337101742284405,
     0.406736643075800207753985990341,  0.587785252292473129168705954639,
     0.743144825477394235014697048974,  0.866025403784438646763723170753,
     0.951056516295153572116439333379,  0.994521895368273336922691944981
}

Definition at line 123 of file dca_lbr.c.

Referenced by convert_lpc().