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

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
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 32 of file dca_lbr.c.

Referenced by filter_ts(), and parse_tonal().

Enumeration Type Documentation

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 34 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 48 of file dca_lbr.c.

Function Documentation

static av_cold void init_tables ( void )

static

Definition at line 127 of file dca_lbr.c.

Referenced by ff_dca_lbr_init().

static int parse_lfe_24 ( DCALbrDecoder * s )

static

Definition at line 144 of file dca_lbr.c.

Referenced by parse_lfe_chunk().

static int parse_lfe_16 ( DCALbrDecoder * s )

static

Definition at line 198 of file dca_lbr.c.

Referenced by parse_lfe_chunk().

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

static

Definition at line 248 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 272 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 281 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 363 of file dca_lbr.c.

Referenced by ff_dca_lbr_parse().

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().

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().

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().

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().

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().

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().

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().

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().

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().

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().

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().

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().

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().

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().

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().

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().

static int init_sample_rate ( DCALbrDecoder * s )

static

Definition at line 954 of file dca_lbr.c.

Referenced by parse_decoder_init().

static int alloc_sample_buffer ( DCALbrDecoder * s )

static

Definition at line 992 of file dca_lbr.c.

Referenced by parse_decoder_init().

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

static

Definition at line 1016 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 1168 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 1405 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 1442 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 1478 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 1490 of file dca_lbr.c.

Referenced by filter_ts().

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

static

Definition at line 1512 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 1597 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 1623 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 1687 of file dca_lbr.c.

Referenced by transform_channel().

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

static

Definition at line 1701 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 1735 of file dca_lbr.c.

Referenced by dcadec_decode_frame().

av_cold void ff_dca_lbr_flush ( DCALbrDecoder * s )

Definition at line 1795 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 1819 of file dca_lbr.c.

Referenced by dcadec_init().

av_cold void ff_dca_lbr_close ( DCALbrDecoder * s )

Definition at line 1830 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 86 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 96 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 106 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 110 of file dca_lbr.c.

Referenced by 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
}