Bitstream parser for ATRAC3+ decoder. More...

#include "libavutil/avassert.h"
#include "avcodec.h"
#include "get_bits.h"
#include "atrac3plus.h"
#include "atrac3plus_data.h"

Macros
#define	UNPACK_SF_VQ_SHAPE(gb, dst, num_vals)

#define	DEC_CT_IDX_COMMON(OP)

#define	CODING_DIRECT get_bits(gb, num_bits)

#define	CODING_VLC get_vlc2(gb, vlc_tab->table, vlc_tab->bits, 1)

#define	CODING_VLC_DELTA

#define	CODING_VLC_DIFF

Functions
static av_cold void	build_canonical_huff (const uint8_t cb, const uint8_t xlat, int tab_offset, VLC out_vlc)
	Generate canonical VLC table from given descriptor. More...

av_cold void	ff_atrac3p_init_vlcs (void)
	Initialize VLC tables for bitstream parsing. More...

static int	num_coded_units (GetBitContext gb, Atrac3pChanParams chan, Atrac3pChanUnitCtx ctx, AVCodecContext avctx)
	Decode number of coded quantization units. More...

static int	add_wordlen_weights (Atrac3pChanUnitCtx ctx, Atrac3pChanParams chan, int wtab_idx, AVCodecContext *avctx)
	Add weighting coefficients to the decoded word-length information. More...

static int	subtract_sf_weights (Atrac3pChanUnitCtx ctx, Atrac3pChanParams chan, int wtab_idx, AVCodecContext *avctx)
	Subtract weighting coefficients from decoded scalefactors. More...

static void	unpack_vq_shape (int start_val, const int8_t shape_vec, int dst, int num_values)
	Unpack vector quantization tables. More...

static int	decode_channel_wordlen (GetBitContext gb, Atrac3pChanUnitCtx ctx, int ch_num, AVCodecContext *avctx)
	Decode word length for each quantization unit of a channel. More...

static int	decode_channel_sf_idx (GetBitContext gb, Atrac3pChanUnitCtx ctx, int ch_num, AVCodecContext *avctx)
	Decode scale factor indexes for each quant unit of a channel. More...

static int	decode_quant_wordlen (GetBitContext gb, Atrac3pChanUnitCtx ctx, int num_channels, AVCodecContext *avctx)
	Decode word length information for each channel. More...

static int	decode_scale_factors (GetBitContext gb, Atrac3pChanUnitCtx ctx, int num_channels, AVCodecContext *avctx)
	Decode scale factor indexes for each channel. More...

static int	get_num_ct_values (GetBitContext gb, Atrac3pChanUnitCtx ctx, AVCodecContext *avctx)
	Decode number of code table values. More...

static int	decode_channel_code_tab (GetBitContext gb, Atrac3pChanUnitCtx ctx, int ch_num, AVCodecContext *avctx)
	Decode code table indexes for each quant unit of a channel. More...

static int	decode_code_table_indexes (GetBitContext gb, Atrac3pChanUnitCtx ctx, int num_channels, AVCodecContext *avctx)
	Decode code table indexes for each channel. More...

static void	decode_qu_spectra (GetBitContext gb, const Atrac3pSpecCodeTab tab, VLC vlc_tab, int16_t out, const int num_specs)
	Decode huffman-coded spectral lines for a given quant unit. More...

static void	decode_spectrum (GetBitContext gb, Atrac3pChanUnitCtx ctx, int num_channels, AVCodecContext *avctx)
	Decode huffman-coded IMDCT spectrum for all channels. More...

static int	get_subband_flags (GetBitContext gb, uint8_t out, int num_flags)
	Retrieve specified amount of flag bits from the input bitstream. More...

static void	decode_window_shape (GetBitContext gb, Atrac3pChanUnitCtx ctx, int num_channels)
	Decode mdct window shape flags for all channels. More...

static int	decode_gainc_npoints (GetBitContext gb, Atrac3pChanUnitCtx ctx, int ch_num, int coded_subbands)
	Decode number of gain control points. More...

static void	gainc_level_mode3s (AtracGainInfo dst, AtracGainInfo ref)
	Implements coding mode 3 (slave) for gain compensation levels. More...

static void	gainc_level_mode1m (GetBitContext gb, Atrac3pChanUnitCtx ctx, AtracGainInfo *dst)
	Implements coding mode 1 (master) for gain compensation levels. More...

static int	decode_gainc_levels (GetBitContext gb, Atrac3pChanUnitCtx ctx, int ch_num, int coded_subbands)
	Decode level code for each gain control point. More...

static void	gainc_loc_mode0 (GetBitContext gb, Atrac3pChanUnitCtx ctx, AtracGainInfo *dst, int pos)
	Implements coding mode 0 for gain compensation locations. More...

static void	gainc_loc_mode1 (GetBitContext gb, Atrac3pChanUnitCtx ctx, AtracGainInfo *dst)
	Implements coding mode 1 for gain compensation locations. More...

static int	decode_gainc_loc_codes (GetBitContext gb, Atrac3pChanUnitCtx ctx, int ch_num, int coded_subbands, AVCodecContext *avctx)
	Decode location code for each gain control point. More...

static int	decode_gainc_data (GetBitContext gb, Atrac3pChanUnitCtx ctx, int num_channels, AVCodecContext *avctx)
	Decode gain control data for all channels. More...

static void	decode_tones_envelope (GetBitContext gb, Atrac3pChanUnitCtx ctx, int ch_num, int band_has_tones[])
	Decode envelope for all tones of a channel. More...

static int	decode_band_numwavs (GetBitContext gb, Atrac3pChanUnitCtx ctx, int ch_num, int band_has_tones[], AVCodecContext *avctx)
	Decode number of tones for each subband of a channel. More...

static void	decode_tones_frequency (GetBitContext gb, Atrac3pChanUnitCtx ctx, int ch_num, int band_has_tones[])
	Decode frequency information for each subband of a channel. More...

static void	decode_tones_amplitude (GetBitContext gb, Atrac3pChanUnitCtx ctx, int ch_num, int band_has_tones[])
	Decode amplitude information for each subband of a channel. More...

static void	decode_tones_phase (GetBitContext gb, Atrac3pChanUnitCtx ctx, int ch_num, int band_has_tones[])
	Decode phase information for each subband of a channel. More...

static int	decode_tones_info (GetBitContext gb, Atrac3pChanUnitCtx ctx, int num_channels, AVCodecContext *avctx)
	Decode tones info for all channels. More...

int	ff_atrac3p_decode_channel_unit (GetBitContext gb, Atrac3pChanUnitCtx ctx, int num_channels, AVCodecContext *avctx)
	Decode bitstream data of a channel unit. More...

Variables
static VLC_TYPE	tables_data [154276][2]

static VLC	wl_vlc_tabs [4]

static VLC	sf_vlc_tabs [8]

static VLC	ct_vlc_tabs [4]

static VLC	spec_vlc_tabs [112]

static VLC	gain_vlc_tabs [11]

static VLC	tone_vlc_tabs [7]

Detailed Description

Bitstream parser for ATRAC3+ decoder.

Definition in file atrac3plus.c.

Macro Definition Documentation

◆ UNPACK_SF_VQ_SHAPE

#define UNPACK_SF_VQ_SHAPE	(	gb,
		dst,
		num_vals
	)

Value:

start_val = get_bits((gb), 6);                                       \
    unpack_vq_shape(start_val, &atrac3p_sf_shapes[get_bits((gb), 6)][0], \
                    (dst), (num_vals))

Definition at line 321 of file atrac3plus.c.

Referenced by decode_channel_sf_idx().

◆ DEC_CT_IDX_COMMON

#define DEC_CT_IDX_COMMON ( OP )

Value:

num_vals = get_num_ct_values(gb, ctx, avctx);                       \
    if (num_vals < 0)                                                   \
        return num_vals;                                                \
                                                                        \
    for (i = 0; i < num_vals; i++) {                                    \
        if (chan->qu_wordlen[i]) {                                      \
            chan->qu_tab_idx[i] = OP;                                   \
        } else if (ch_num && ref_chan->qu_wordlen[i])                   \
            /* get clone master flag */                                 \
            chan->qu_tab_idx[i] = get_bits1(gb);                        \
    }

Definition at line 690 of file atrac3plus.c.

Referenced by decode_channel_code_tab().

◆ CODING_DIRECT

#define CODING_DIRECT get_bits(gb, num_bits)

Definition at line 703 of file atrac3plus.c.

Referenced by decode_channel_code_tab().

◆ CODING_VLC

#define CODING_VLC get_vlc2(gb, vlc_tab->table, vlc_tab->bits, 1)

Definition at line 705 of file atrac3plus.c.

Referenced by decode_channel_code_tab().

◆ CODING_VLC_DELTA

#define CODING_VLC_DELTA

Value:

(!i) ? CODING_VLC                                                   \
         : (pred + get_vlc2(gb, delta_vlc->table,                       \
                            delta_vlc->bits, 1)) & mask;                \
    pred = chan->qu_tab_idx[i]

Definition at line 707 of file atrac3plus.c.

Referenced by decode_channel_code_tab().

◆ CODING_VLC_DIFF

#define CODING_VLC_DIFF

Value:

(ref_chan->qu_tab_idx[i] + \

get_vlc2(gb, vlc_tab->table, vlc_tab->bits, 1)) & mask

mask

static const uint16_t mask[17]

Definition: lzw.c:38

Definition at line 713 of file atrac3plus.c.

Referenced by decode_channel_code_tab().

Function Documentation

◆ build_canonical_huff()

static av_cold void build_canonical_huff	(	const uint8_t *	cb,
		const uint8_t *	xlat,
		int *	tab_offset,
		VLC *	out_vlc
	)

static

Generate canonical VLC table from given descriptor.

Parameters

[in]	cb	ptr to codebook descriptor
[in]	xlat	ptr to translation table or NULL
[in,out]	tab_offset	starting offset to the generated vlc table
[out]	out_vlc	ptr to vlc table to be generated

Definition at line 50 of file atrac3plus.c.

Referenced by ff_atrac3p_init_vlcs().

◆ ff_atrac3p_init_vlcs()

av_cold void ff_atrac3p_init_vlcs ( void )

Initialize VLC tables for bitstream parsing.

Definition at line 80 of file atrac3plus.c.

Referenced by atrac3p_decode_init().

◆ num_coded_units()

static int num_coded_units	(	GetBitContext *	gb,
		Atrac3pChanParams *	chan,
		Atrac3pChanUnitCtx *	ctx,
		AVCodecContext *	avctx
	)

static

Decode number of coded quantization units.

Parameters

[in]	gb	the GetBit context
[in,out]	chan	ptr to the channel parameters
[in,out]	ctx	ptr to the channel unit context
[in]	avctx	ptr to the AVCodecContext

Returns: result code: 0 = OK, otherwise - error code

Definition at line 221 of file atrac3plus.c.

Referenced by decode_channel_wordlen().

◆ add_wordlen_weights()

static int add_wordlen_weights	(	Atrac3pChanUnitCtx *	ctx,
		Atrac3pChanParams *	chan,
		int	wtab_idx,
		AVCodecContext *	avctx
	)

static

Add weighting coefficients to the decoded word-length information.

Parameters

[in,out]	ctx	ptr to the channel unit context
[in,out]	chan	ptr to the channel parameters
[in]	wtab_idx	index of the table of weights
[in]	avctx	ptr to the AVCodecContext

Returns: result code: 0 = OK, otherwise - error code

Definition at line 251 of file atrac3plus.c.

Referenced by decode_channel_wordlen().

◆ subtract_sf_weights()

static int subtract_sf_weights	(	Atrac3pChanUnitCtx *	ctx,
		Atrac3pChanParams *	chan,
		int	wtab_idx,
		AVCodecContext *	avctx
	)

static

Subtract weighting coefficients from decoded scalefactors.

Parameters

[in,out]	ctx	ptr to the channel unit context
[in,out]	chan	ptr to the channel parameters
[in]	wtab_idx	index of table of weights
[in]	avctx	ptr to the AVCodecContext

Returns: result code: 0 = OK, otherwise - error code

Definition at line 281 of file atrac3plus.c.

Referenced by decode_channel_sf_idx().

◆ unpack_vq_shape()

static void unpack_vq_shape	(	int	start_val,
		const int8_t *	shape_vec,
		int *	dst,
		int	num_values
	)

inlinestatic

Unpack vector quantization tables.

Parameters

[in]	start_val	start value for the unpacked table
[in]	shape_vec	ptr to table to unpack
[out]	dst	ptr to output array
[in]	num_values	number of values to unpack

Definition at line 309 of file atrac3plus.c.

Referenced by decode_channel_wordlen().

◆ decode_channel_wordlen()

static int decode_channel_wordlen	(	GetBitContext *	gb,
		Atrac3pChanUnitCtx *	ctx,
		int	ch_num,
		AVCodecContext *	avctx
	)

static

Decode word length for each quantization unit of a channel.

Parameters

[in]	gb	the GetBit context
[in,out]	ctx	ptr to the channel unit context
[in]	ch_num	channel to process
[in]	avctx	ptr to the AVCodecContext

Returns: result code: 0 = OK, otherwise - error code

Definition at line 335 of file atrac3plus.c.

Referenced by decode_quant_wordlen().

◆ decode_channel_sf_idx()

static int decode_channel_sf_idx	(	GetBitContext *	gb,
		Atrac3pChanUnitCtx *	ctx,
		int	ch_num,
		AVCodecContext *	avctx
	)

static

Decode scale factor indexes for each quant unit of a channel.

Parameters

[in]	gb	the GetBit context
[in,out]	ctx	ptr to the channel unit context
[in]	ch_num	channel to process
[in]	avctx	ptr to the AVCodecContext

Returns: result code: 0 = OK, otherwise - error code

Definition at line 478 of file atrac3plus.c.

Referenced by decode_scale_factors().

◆ decode_quant_wordlen()

static int decode_quant_wordlen	(	GetBitContext *	gb,
		Atrac3pChanUnitCtx *	ctx,
		int	num_channels,
		AVCodecContext *	avctx
	)

static

Decode word length information for each channel.

Parameters

[in]	gb	the GetBit context
[in,out]	ctx	ptr to the channel unit context
[in]	num_channels	number of channels to process
[in]	avctx	ptr to the AVCodecContext

Returns: result code: 0 = OK, otherwise - error code

Definition at line 613 of file atrac3plus.c.

Referenced by ff_atrac3p_decode_channel_unit().

◆ decode_scale_factors()

static int decode_scale_factors	(	GetBitContext *	gb,
		Atrac3pChanUnitCtx *	ctx,
		int	num_channels,
		AVCodecContext *	avctx
	)

static

Decode scale factor indexes for each channel.

Parameters

[in]	gb	the GetBit context
[in,out]	ctx	ptr to the channel unit context
[in]	num_channels	number of channels to process
[in]	avctx	ptr to the AVCodecContext

Returns: result code: 0 = OK, otherwise - error code

Definition at line 646 of file atrac3plus.c.

Referenced by ff_atrac3p_decode_channel_unit().

◆ get_num_ct_values()

static int get_num_ct_values	(	GetBitContext *	gb,
		Atrac3pChanUnitCtx *	ctx,
		AVCodecContext *	avctx
	)

static

Decode number of code table values.

Parameters

[in]	gb	the GetBit context
[in,out]	ctx	ptr to the channel unit context
[in]	avctx	ptr to the AVCodecContext

Returns: result code: 0 = OK, otherwise - error code

Definition at line 673 of file atrac3plus.c.

◆ decode_channel_code_tab()

static int decode_channel_code_tab	(	GetBitContext *	gb,
		Atrac3pChanUnitCtx *	ctx,
		int	ch_num,
		AVCodecContext *	avctx
	)

static

Decode code table indexes for each quant unit of a channel.

Parameters

[in]	gb	the GetBit context
[in,out]	ctx	ptr to the channel unit context
[in]	ch_num	channel to process
[in]	avctx	ptr to the AVCodecContext

Returns: result code: 0 = OK, otherwise - error code

Definition at line 726 of file atrac3plus.c.

Referenced by decode_code_table_indexes().

◆ decode_code_table_indexes()

static int decode_code_table_indexes	(	GetBitContext *	gb,
		Atrac3pChanUnitCtx *	ctx,
		int	num_channels,
		AVCodecContext *	avctx
	)

static

Decode code table indexes for each channel.

Parameters

[in]	gb	the GetBit context
[in,out]	ctx	ptr to the channel unit context
[in]	num_channels	number of channels to process
[in]	avctx	ptr to the AVCodecContext

Returns: result code: 0 = OK, otherwise - error code

Definition at line 779 of file atrac3plus.c.

Referenced by ff_atrac3p_decode_channel_unit().

◆ decode_qu_spectra()

static void decode_qu_spectra	(	GetBitContext *	gb,
		const Atrac3pSpecCodeTab *	tab,
		VLC *	vlc_tab,
		int16_t *	out,
		const int	num_specs
	)

static

Decode huffman-coded spectral lines for a given quant unit.

This is a generalized version for all known coding modes. Its speed can be improved by creating separate functions for each mode.

Parameters

[in]	gb	the GetBit context
[in]	tab	code table telling how to decode spectral lines
[in]	vlc_tab	ptr to the huffman table associated with the code table
[out]	out	pointer to buffer where decoded data should be stored
[in]	num_specs	number of spectral lines to decode

Definition at line 812 of file atrac3plus.c.

Referenced by decode_spectrum().

◆ decode_spectrum()

static void decode_spectrum	(	GetBitContext *	gb,
		Atrac3pChanUnitCtx *	ctx,
		int	num_channels,
		AVCodecContext *	avctx
	)

static

Decode huffman-coded IMDCT spectrum for all channels.

Parameters

[in]	gb	the GetBit context
[in,out]	ctx	ptr to the channel unit context
[in]	num_channels	number of channels to process
[in]	avctx	ptr to the AVCodecContext

Definition at line 851 of file atrac3plus.c.

Referenced by ff_atrac3p_decode_channel_unit().

◆ get_subband_flags()

static int get_subband_flags	(	GetBitContext *	gb,
		uint8_t *	out,
		int	num_flags
	)

static

Retrieve specified amount of flag bits from the input bitstream.

The data can be shortened in the case of the following two common conditions: if all bits are zero then only one signal bit = 0 will be stored, if all bits are ones then two signal bits = 1,0 will be stored. Otherwise, all necessary bits will be directly stored prefixed by two signal bits = 1,1.

Parameters

[in]	gb	ptr to the GetBitContext
[out]	out	where to place decoded flags
[in]	num_flags	number of flags to process

Returns: : 0 = all flag bits are zero, 1 = there is at least one non-zero flag bit

Definition at line 921 of file atrac3plus.c.

Referenced by decode_tones_info(), decode_window_shape(), and ff_atrac3p_decode_channel_unit().

◆ decode_window_shape()

static void decode_window_shape	(	GetBitContext *	gb,
		Atrac3pChanUnitCtx *	ctx,
		int	num_channels
	)

static

Decode mdct window shape flags for all channels.

Parameters

[in]	gb	the GetBit context
[in,out]	ctx	ptr to the channel unit context
[in]	num_channels	number of channels to process

Definition at line 946 of file atrac3plus.c.

Referenced by ff_atrac3p_decode_channel_unit().

◆ decode_gainc_npoints()

static int decode_gainc_npoints	(	GetBitContext *	gb,
		Atrac3pChanUnitCtx *	ctx,
		int	ch_num,
		int	coded_subbands
	)

static

Decode number of gain control points.

Parameters

[in]	gb	the GetBit context
[in,out]	ctx	ptr to the channel unit context
[in]	ch_num	channel to process
[in]	coded_subbands	number of subbands to process

Returns: result code: 0 = OK, otherwise - error code

Definition at line 965 of file atrac3plus.c.

Referenced by decode_gainc_data().

◆ gainc_level_mode3s()

static void gainc_level_mode3s	(	AtracGainInfo *	dst,
		AtracGainInfo *	ref
	)

inlinestatic

Implements coding mode 3 (slave) for gain compensation levels.

Parameters

[out]	dst	ptr to the output array
[in]	ref	ptr to the reference channel

Definition at line 1030 of file atrac3plus.c.

Referenced by decode_gainc_levels().

◆ gainc_level_mode1m()

static void gainc_level_mode1m	(	GetBitContext *	gb,
		Atrac3pChanUnitCtx *	ctx,
		AtracGainInfo *	dst
	)

inlinestatic

Implements coding mode 1 (master) for gain compensation levels.

Parameters

[in]	gb	the GetBit context
[in]	ctx	ptr to the channel unit context
[out]	dst	ptr to the output array

Definition at line 1045 of file atrac3plus.c.

Referenced by decode_gainc_levels().

◆ decode_gainc_levels()

static int decode_gainc_levels	(	GetBitContext *	gb,
		Atrac3pChanUnitCtx *	ctx,
		int	ch_num,
		int	coded_subbands
	)

static

Decode level code for each gain control point.

Parameters

[in]	gb	the GetBit context
[in,out]	ctx	ptr to the channel unit context
[in]	ch_num	channel to process
[in]	coded_subbands	number of subbands to process

Returns: result code: 0 = OK, otherwise - error code

Definition at line 1071 of file atrac3plus.c.

Referenced by decode_gainc_data().

◆ gainc_loc_mode0()

static void gainc_loc_mode0	(	GetBitContext *	gb,
		Atrac3pChanUnitCtx *	ctx,
		AtracGainInfo *	dst,
		int	pos
	)

inlinestatic

Implements coding mode 0 for gain compensation locations.

Parameters

[in]	gb	the GetBit context
[in]	ctx	ptr to the channel unit context
[out]	dst	ptr to the output array
[in]	pos	position of the value to be processed

Definition at line 1153 of file atrac3plus.c.

Referenced by decode_gainc_loc_codes().

◆ gainc_loc_mode1()

static void gainc_loc_mode1	(	GetBitContext *	gb,
		Atrac3pChanUnitCtx *	ctx,
		AtracGainInfo *	dst
	)

inlinestatic

Implements coding mode 1 for gain compensation locations.

Parameters

[in]	gb	the GetBit context
[in]	ctx	ptr to the channel unit context
[out]	dst	ptr to the output array

Definition at line 1176 of file atrac3plus.c.

Referenced by decode_gainc_loc_codes().

◆ decode_gainc_loc_codes()

static int decode_gainc_loc_codes	(	GetBitContext *	gb,
		Atrac3pChanUnitCtx *	ctx,
		int	ch_num,
		int	coded_subbands,
		AVCodecContext *	avctx
	)

static

Decode location code for each gain control point.

Parameters

[in]	gb	the GetBit context
[in,out]	ctx	ptr to the channel unit context
[in]	ch_num	channel to process
[in]	coded_subbands	number of subbands to process
[in]	avctx	ptr to the AVCodecContext

Returns: result code: 0 = OK, otherwise - error code

Definition at line 1208 of file atrac3plus.c.

Referenced by decode_gainc_data().

◆ decode_gainc_data()

static int decode_gainc_data	(	GetBitContext *	gb,
		Atrac3pChanUnitCtx *	ctx,
		int	num_channels,
		AVCodecContext *	avctx
	)

static

Decode gain control data for all channels.

Parameters

[in]	gb	the GetBit context
[in,out]	ctx	ptr to the channel unit context
[in]	num_channels	number of channels to process
[in]	avctx	ptr to the AVCodecContext

Returns: result code: 0 = OK, otherwise - error code

Definition at line 1362 of file atrac3plus.c.

Referenced by ff_atrac3p_decode_channel_unit().

◆ decode_tones_envelope()

static void decode_tones_envelope	(	GetBitContext *	gb,
		Atrac3pChanUnitCtx *	ctx,
		int	ch_num,
		int	band_has_tones[]
	)

static

Decode envelope for all tones of a channel.

Parameters

[in]	gb	the GetBit context
[in,out]	ctx	ptr to the channel unit context
[in]	ch_num	channel to process
[in]	band_has_tones	ptr to an array of per-band-flags: 1 - tone data present

Definition at line 1405 of file atrac3plus.c.

Referenced by decode_tones_info().

◆ decode_band_numwavs()

static int decode_band_numwavs	(	GetBitContext *	gb,
		Atrac3pChanUnitCtx *	ctx,
		int	ch_num,
		int	band_has_tones[],
		AVCodecContext *	avctx
	)

static

Decode number of tones for each subband of a channel.

Parameters

[in]	gb	the GetBit context
[in,out]	ctx	ptr to the channel unit context
[in]	ch_num	channel to process
[in]	band_has_tones	ptr to an array of per-band-flags: 1 - tone data present
[in]	avctx	ptr to the AVCodecContext

Returns: result code: 0 = OK, otherwise - error code

fixed-length coding

variable-length coding

VLC modulo delta to master (slave only)

copy master (slave only)

initialize start tone index for each subband

Definition at line 1446 of file atrac3plus.c.

Referenced by decode_tones_info().

◆ decode_tones_frequency()

static void decode_tones_frequency	(	GetBitContext *	gb,
		Atrac3pChanUnitCtx *	ctx,
		int	ch_num,
		int	band_has_tones[]
	)

static

Decode frequency information for each subband of a channel.

Parameters

[in]	gb	the GetBit context
[in,out]	ctx	ptr to the channel unit context
[in]	ch_num	channel to process
[in]	band_has_tones	ptr to an array of per-band-flags: 1 - tone data present

packed numbers in descending order

packed numbers in ascending order

Definition at line 1510 of file atrac3plus.c.

Referenced by decode_tones_info().

◆ decode_tones_amplitude()

static void decode_tones_amplitude	(	GetBitContext *	gb,
		Atrac3pChanUnitCtx *	ctx,
		int	ch_num,
		int	band_has_tones[]
	)

static

Decode amplitude information for each subband of a channel.

Parameters

[in]	gb	the GetBit context
[in,out]	ctx	ptr to the channel unit context
[in]	ch_num	channel to process
[in]	band_has_tones	ptr to an array of per-band-flags: 1 - tone data present

fixed-length coding

min + VLC delta

VLC modulo delta to master (slave only)

clone master (slave only)

Definition at line 1570 of file atrac3plus.c.

Referenced by decode_tones_info().

◆ decode_tones_phase()

static void decode_tones_phase	(	GetBitContext *	gb,
		Atrac3pChanUnitCtx *	ctx,
		int	ch_num,
		int	band_has_tones[]
	)

static

Decode phase information for each subband of a channel.

Parameters

[in]	gb	the GetBit context
[in,out]	ctx	ptr to the channel unit context
[in]	ch_num	channel to process
[in]	band_has_tones	ptr to an array of per-band-flags: 1 - tone data present

Definition at line 1670 of file atrac3plus.c.

Referenced by decode_tones_info().

◆ decode_tones_info()

static int decode_tones_info	(	GetBitContext *	gb,
		Atrac3pChanUnitCtx *	ctx,
		int	num_channels,
		AVCodecContext *	avctx
	)

static

Decode tones info for all channels.

Parameters

[in]	gb	the GetBit context
[in,out]	ctx	ptr to the channel unit context
[in]	num_channels	number of channels to process
[in]	avctx	ptr to the AVCodecContext

Returns: result code: 0 = OK, otherwise - error code

Definition at line 1695 of file atrac3plus.c.

Referenced by ff_atrac3p_decode_channel_unit().

◆ ff_atrac3p_decode_channel_unit()

int ff_atrac3p_decode_channel_unit	(	GetBitContext *	gb,
		Atrac3pChanUnitCtx *	ctx,
		int	num_channels,
		AVCodecContext *	avctx
	)

Decode bitstream data of a channel unit.

Parameters

[in]	gb	the GetBit context
[in,out]	ctx	ptr to the channel unit context
[in]	num_channels	number of channels to process
[in]	avctx	ptr to the AVCodecContext

Returns: result code: 0 = OK, otherwise - error code

Definition at line 1757 of file atrac3plus.c.

Referenced by atrac3p_decode_frame().

Variable Documentation

◆ tables_data

VLC_TYPE tables_data[154276][2]

static

Definition at line 34 of file atrac3plus.c.

Referenced by build_canonical_huff(), and ff_atrac3p_init_vlcs().

◆ wl_vlc_tabs

VLC wl_vlc_tabs[4]

static

Definition at line 35 of file atrac3plus.c.

◆ sf_vlc_tabs

VLC sf_vlc_tabs[8]

static

Definition at line 36 of file atrac3plus.c.

◆ ct_vlc_tabs

VLC ct_vlc_tabs[4]

static

Definition at line 37 of file atrac3plus.c.

Referenced by decode_channel_code_tab().

◆ spec_vlc_tabs

VLC spec_vlc_tabs[112]

static

Definition at line 38 of file atrac3plus.c.

◆ gain_vlc_tabs

VLC gain_vlc_tabs[11]

static

Definition at line 39 of file atrac3plus.c.

◆ tone_vlc_tabs

VLC tone_vlc_tabs[7]

static

Definition at line 40 of file atrac3plus.c.

Macros

Functions

Variables

Detailed Description

Macro Definition Documentation

◆ UNPACK_SF_VQ_SHAPE

◆ DEC_CT_IDX_COMMON

◆ CODING_DIRECT

◆ CODING_VLC

◆ CODING_VLC_DELTA

◆ CODING_VLC_DIFF

Function Documentation

◆ build_canonical_huff()

◆ ff_atrac3p_init_vlcs()

◆ num_coded_units()

◆ add_wordlen_weights()

◆ subtract_sf_weights()

◆ unpack_vq_shape()

◆ decode_channel_wordlen()

◆ decode_channel_sf_idx()

◆ decode_quant_wordlen()

◆ decode_scale_factors()

◆ get_num_ct_values()

◆ decode_channel_code_tab()

◆ decode_code_table_indexes()

◆ decode_qu_spectra()

◆ decode_spectrum()

◆ get_subband_flags()

◆ decode_window_shape()

◆ decode_gainc_npoints()

◆ gainc_level_mode3s()

◆ gainc_level_mode1m()

◆ decode_gainc_levels()

◆ gainc_loc_mode0()

◆ gainc_loc_mode1()

◆ decode_gainc_loc_codes()

◆ decode_gainc_data()

◆ decode_tones_envelope()

◆ decode_band_numwavs()

◆ decode_tones_frequency()

◆ decode_tones_amplitude()

◆ decode_tones_phase()

◆ decode_tones_info()

◆ ff_atrac3p_decode_channel_unit()

Variable Documentation

◆ tables_data

◆ wl_vlc_tabs

◆ sf_vlc_tabs

◆ ct_vlc_tabs

◆ spec_vlc_tabs

◆ gain_vlc_tabs

◆ tone_vlc_tabs