dca_lbr.c File Reference

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

Go to the source code of this file.

Data Structures
struct	LBRChunk

Macros
#define	BITSTREAM_READER_LE
#define	AMP_MAX   56

Enumerations
enum	LBRHeader { LBR_HEADER_SYNC_ONLY = 1, LBR_HEADER_DECODER_INIT = 2 }
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
static av_cold void	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, VLC *vlc, 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, 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 uint8_t	channel_counts [7]
static const uint16_t	channel_layouts [7]
static float	cos_tab [256]
static float	lpc_tab [16]

Macro Definition Documentation

#define BITSTREAM_READER_LE

Definition at line 21 of file dca_lbr.c.

#define AMP_MAX   56

Definition at line 31 of file dca_lbr.c.

Referenced by filter_ts(), and parse_tonal().

Enumeration Type Documentation

enum LBRHeader

Enumerator
LBR_HEADER_SYNC_ONLY
LBR_HEADER_DECODER_INIT

Definition at line 33 of file dca_lbr.c.

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 38 of file dca_lbr.c.

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 52 of file dca_lbr.c.

Function Documentation

static av_cold void init_tables ( void  )

static

Definition at line 131 of file dca_lbr.c.

Referenced by ff_dca_lbr_init().

static int parse_lfe_24 ( DCALbrDecoder *  s )

static

Definition at line 148 of file dca_lbr.c.

Referenced by parse_lfe_chunk().

static int parse_lfe_16 ( DCALbrDecoder *  s )

static

Definition at line 202 of file dca_lbr.c.

Referenced by parse_lfe_chunk().

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

static

Definition at line 252 of file dca_lbr.c.

Referenced by ff_dca_lbr_parse().

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

inlinestatic

Definition at line 273 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().

static int parse_tonal ( DCALbrDecoder *  s, int  group  )

static

Definition at line 282 of file dca_lbr.c.

Referenced by parse_tonal_chunk(), and parse_tonal_group().

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

static

Definition at line 364 of file dca_lbr.c.

Referenced by ff_dca_lbr_parse().

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

static

Definition at line 393 of file dca_lbr.c.

Referenced by ff_dca_lbr_parse().

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 408 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().

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

static

Definition at line 420 of file dca_lbr.c.

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

static int parse_st_code ( GetBitContext *  s, int  min_v  )

static

Definition at line 490 of file dca_lbr.c.

Referenced by parse_grid_1_chunk().

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

static

Definition at line 504 of file dca_lbr.c.

Referenced by ff_dca_lbr_parse().

static int parse_grid_1_sec_ch ( DCALbrDecoder *  s, int  ch2  )

static

Definition at line 568 of file dca_lbr.c.

Referenced by parse_ts2_chunk().

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

static

Definition at line 592 of file dca_lbr.c.

Referenced by parse_ts().

static float lbr_rand ( DCALbrDecoder *  s, int  sb  )

static

Definition at line 614 of file dca_lbr.c.

Referenced by parse_ch(), and random_ts().

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 623 of file dca_lbr.c.

Referenced by parse_ts().

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

static

Definition at line 697 of file dca_lbr.c.

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

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

static

Convert from reflection coefficients to direct form coefficients.

Definition at line 760 of file dca_lbr.c.

Referenced by parse_lpc().

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

static

Definition at line 776 of file dca_lbr.c.

Referenced by parse_high_res_grid(), and parse_ts1_chunk().

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

static

Definition at line 797 of file dca_lbr.c.

Referenced by ff_dca_lbr_parse().

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

static

Definition at line 856 of file dca_lbr.c.

Referenced by parse_ts1_chunk(), and parse_ts2_chunk().

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

static

Definition at line 898 of file dca_lbr.c.

Referenced by ff_dca_lbr_parse().

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

static

Definition at line 915 of file dca_lbr.c.

Referenced by ff_dca_lbr_parse().

static int init_sample_rate ( DCALbrDecoder *  s )

static

Definition at line 936 of file dca_lbr.c.

Referenced by parse_decoder_init().

static int alloc_sample_buffer ( DCALbrDecoder *  s )

static

Definition at line 972 of file dca_lbr.c.

Referenced by parse_decoder_init().

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

static

Definition at line 996 of file dca_lbr.c.

Referenced by ff_dca_lbr_parse().

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

Definition at line 1148 of file dca_lbr.c.

Referenced by dcadec_decode_frame().

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

static

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

Definition at line 1385 of file dca_lbr.c.

Referenced by ff_dca_lbr_filter_frame().

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

static

Fill unallocated subbands with randomness.

Definition at line 1422 of file dca_lbr.c.

Referenced by ff_dca_lbr_filter_frame().

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

static

Definition at line 1458 of file dca_lbr.c.

Referenced by synth_lpc().

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

static

Definition at line 1470 of file dca_lbr.c.

Referenced by filter_ts().

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

static

Definition at line 1492 of file dca_lbr.c.

Referenced by ff_dca_lbr_filter_frame().

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

static

Modulate by interpolated partial stereo coefficients.

Definition at line 1577 of file dca_lbr.c.

Referenced by ff_dca_lbr_filter_frame().

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 1603 of file dca_lbr.c.

Referenced by 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 1667 of file dca_lbr.c.

Referenced by transform_channel().

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

static

Definition at line 1681 of file dca_lbr.c.

Referenced by ff_dca_lbr_filter_frame().

int ff_dca_lbr_filter_frame	(	DCALbrDecoder *	s,
		AVFrame *	frame
	)

Definition at line 1715 of file dca_lbr.c.

Referenced by dcadec_decode_frame().

av_cold void ff_dca_lbr_flush

(

DCALbrDecoder *

s

)

Definition at line 1775 of file dca_lbr.c.

Referenced by dcadec_flush(), and parse_decoder_init().

av_cold int ff_dca_lbr_init

(

DCALbrDecoder *

s

)

Definition at line 1799 of file dca_lbr.c.

Referenced by dcadec_init().

av_cold void ff_dca_lbr_close

(

DCALbrDecoder *

s

)

Definition at line 1810 of file dca_lbr.c.

Referenced by dcadec_close().

Variable Documentation

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 90 of file dca_lbr.c.

Referenced by encode_init(), and ff_dca_lbr_filter_frame().

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 100 of file dca_lbr.c.

Referenced by encode_init(), and ff_dca_lbr_filter_frame().

const uint8_t lfe_index[7]

static

Initial value:

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

Definition at line 110 of file dca_lbr.c.

Referenced by ff_dca_lbr_filter_frame(), and lfe_downsample().

const uint8_t channel_counts[7]

static

Initial value:

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

Definition at line 114 of file dca_lbr.c.

Referenced by asink_query_formats(), ff_dca_lbr_filter_frame(), and get_stream_info().

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 118 of file dca_lbr.c.

Referenced by asink_query_formats(), avfilter_make_format64_list(), channelmap_query_formats(), configure_output_audio_filter(), ff_add_channel_layout(), ff_channel_layouts_unref(), ff_dca_lbr_filter_frame(), ff_make_formatu64_list(), ff_merge_channel_layouts(), ff_set_common_channel_layouts(), main(), pcm_bluray_parse_header(), print_codec(), and query_formats().

float cos_tab[256]

static

Definition at line 128 of file dca_lbr.c.

Referenced by eval_lpcenv_or_interp(), init_tables(), lpc2lsp(), lsp2lpc(), and synth_tones().

float lpc_tab[16]

static

Definition at line 129 of file dca_lbr.c.

Referenced by convert_lpc(), and init_tables().