aptx.h File Reference

#include "libavutil/intreadwrite.h"
#include "avcodec.h"
#include "mathops.h"

Go to the source code of this file.

Data Structures
struct	FilterSignal
struct	QMFAnalysis
struct	Quantize
struct	InvertQuantize
struct	Prediction
struct	Channel
struct	AptXContext
struct	ConstTables

Macros
#define	NB_FILTERS   2
#define	FILTER_TAPS   16
#define	RSHIFT_SIZE(size)

Enumerations
enum	channels { LEFT, RIGHT, NB_CHANNELS }
enum	subbands {   LF, MLF, MHF, HF,   NB_SUBBANDS }

Functions
static av_always_inline void	aptx_qmf_filter_signal_push (FilterSignal *signal, int32_t sample)
static av_always_inline int32_t	aptx_qmf_convolution (FilterSignal *signal, const int32_t coeffs[FILTER_TAPS], int shift)
static int32_t	aptx_quantized_parity (Channel *channel)
static int	aptx_check_parity (Channel channels[NB_CHANNELS], int32_t *idx)
void	ff_aptx_invert_quantize_and_prediction (Channel *channel, int hd)
void	ff_aptx_generate_dither (Channel *channel)
int	ff_aptx_init (AVCodecContext *avctx)

Variables
ConstTables	ff_aptx_quant_tables [2][NB_SUBBANDS]
static const int32_t	aptx_qmf_outer_coeffs [NB_FILTERS][FILTER_TAPS]
static const int32_t	aptx_qmf_inner_coeffs [NB_FILTERS][FILTER_TAPS]

Macro Definition Documentation

NB_FILTERS

#define NB_FILTERS   2

Definition at line 45 of file aptx.h.

FILTER_TAPS

#define FILTER_TAPS   16

Definition at line 46 of file aptx.h.

RSHIFT_SIZE

#define RSHIFT_SIZE

(

size

)

Value:

av_always_inline                                                              \
static int##size##_t rshift##size(int##size##_t value, int shift)             \
{                                                                             \
    int##size##_t rounding = (int##size##_t)1 << (shift - 1);                 \
    int##size##_t mask = ((int##size##_t)1 << (shift + 1)) - 1;               \
    return ((value + rounding) >> shift) - ((value & mask) == rounding);      \
}                                                                             \
av_always_inline                                                              \
static int##size##_t rshift##size##_clip24(int##size##_t value, int shift)    \
{                                                                             \
    return av_clip_intp2(rshift##size(value, shift), 23);                     \
}

Definition at line 112 of file aptx.h.

Enumeration Type Documentation

channels

enum channels

Enumerator
LEFT
RIGHT
NB_CHANNELS

Examples

filter_audio.c.

Definition at line 31 of file aptx.h.

subbands

enum subbands

Enumerator
LF
MLF
MHF
HF
NB_SUBBANDS

Definition at line 37 of file aptx.h.

Function Documentation

aptx_qmf_filter_signal_push()

static av_always_inline void aptx_qmf_filter_signal_push ( FilterSignal *  signal, int32_t  sample  )

static

Definition at line 162 of file aptx.h.

Referenced by aptx_qmf_polyphase_analysis(), and aptx_qmf_polyphase_synthesis().

aptx_qmf_convolution()

static av_always_inline int32_t aptx_qmf_convolution ( FilterSignal *  signal, const int32_t  coeffs[FILTER_TAPS], int  shift  )

static

Definition at line 174 of file aptx.h.

Referenced by aptx_qmf_polyphase_analysis(), and aptx_qmf_polyphase_synthesis().

aptx_quantized_parity()

static int32_t aptx_quantized_parity ( Channel *  channel )

inlinestatic

Definition at line 188 of file aptx.h.

Referenced by aptx_check_parity(), aptx_pack_codeword(), aptx_unpack_codeword(), aptxhd_pack_codeword(), and aptxhd_unpack_codeword().

aptx_check_parity()

static int aptx_check_parity ( Channel  channels[NB_CHANNELS], int32_t *  idx  )

inlinestatic

Definition at line 201 of file aptx.h.

Referenced by aptx_decode_samples(), and aptx_insert_sync().

ff_aptx_invert_quantize_and_prediction()

void ff_aptx_invert_quantize_and_prediction	(	Channel *	channel,
		int	hd
	)

Definition at line 497 of file aptx.c.

Referenced by aptx_decode_samples(), and aptx_encode_samples().

ff_aptx_generate_dither()

void ff_aptx_generate_dither

(

Channel *

channel

)

Definition at line 385 of file aptx.c.

Referenced by aptx_decode_samples(), and aptx_encode_channel().

ff_aptx_init()

int ff_aptx_init

(

AVCodecContext *

avctx

)

Definition at line 508 of file aptx.c.

Referenced by aptx_encode_init().

Variable Documentation

ff_aptx_quant_tables

ConstTables ff_aptx_quant_tables[2][NB_SUBBANDS]

Definition at line 313 of file aptx.c.

Referenced by aptx_encode_channel(), and ff_aptx_invert_quantize_and_prediction().

aptx_qmf_outer_coeffs

const int32_t aptx_qmf_outer_coeffs[NB_FILTERS][FILTER_TAPS]

static

Initial value:

= {
    {
        730, -413, -9611, 43626, -121026, 269973, -585547, 2801966,
        697128, -160481, 27611, 8478, -10043, 3511, 688, -897,
    },
    {
        -897, 688, 3511, -10043, 8478, 27611, -160481, 697128,
        2801966, -585547, 269973, -121026, 43626, -9611, -413, 730,
    },
}

Definition at line 132 of file aptx.h.

Referenced by aptx_qmf_tree_analysis(), and aptx_qmf_tree_synthesis().

aptx_qmf_inner_coeffs

const int32_t aptx_qmf_inner_coeffs[NB_FILTERS][FILTER_TAPS]

static

Initial value:

= {
    {
       1033, -584, -13592, 61697, -171156, 381799, -828088, 3962579,
       985888, -226954, 39048, 11990, -14203, 4966, 973, -1268,
    },
    {
      -1268, 973, 4966, -14203, 11990, 39048, -226954, 985888,
      3962579, -828088, 381799, -171156, 61697, -13592, -584, 1033,
    },
}

Definition at line 147 of file aptx.h.

Referenced by aptx_qmf_tree_analysis(), and aptx_qmf_tree_synthesis().