#include "libavutil/libm.h"
#include "aacenc.h"
#include "aacenc_tns.h"
#include "aactab.h"
#include "aacenc_utils.h"

Macros
#define	TNS_Q_BITS 4

#define	TNS_Q_BITS_IS8 4

#define	TNS_ENABLE_COEF_COMPRESSION

#define	TNS_GAIN_THRESHOLD_LOW 1.4f

#define	TNS_GAIN_THRESHOLD_HIGH 1.16f*TNS_GAIN_THRESHOLD_LOW

Functions
static int	compress_coeffs (int *coef, int order, int c_bits)

void	ff_aac_encode_tns_info (AACEncContext s, SingleChannelElement sce)
	Encode TNS data. More...

void	ff_aac_apply_tns (AACEncContext s, SingleChannelElement sce)

static void	quantize_coefs (double coef, int idx, float *lpc, int order, int c_bits)

void	ff_aac_search_for_tns (AACEncContext s, SingleChannelElement sce)

Detailed Description

AAC encoder temporal noise shaping

Author: Rostislav Pehlivanov ( atomnuker gmail com )

Definition in file aacenc_tns.c.

Macro Definition Documentation

◆ TNS_Q_BITS

#define TNS_Q_BITS 4

Definition at line 35 of file aacenc_tns.c.

◆ TNS_Q_BITS_IS8

#define TNS_Q_BITS_IS8 4

Definition at line 38 of file aacenc_tns.c.

◆ TNS_ENABLE_COEF_COMPRESSION

#define TNS_ENABLE_COEF_COMPRESSION

Definition at line 41 of file aacenc_tns.c.

◆ TNS_GAIN_THRESHOLD_LOW

#define TNS_GAIN_THRESHOLD_LOW 1.4f

Definition at line 44 of file aacenc_tns.c.

◆ TNS_GAIN_THRESHOLD_HIGH

#define TNS_GAIN_THRESHOLD_HIGH 1.16f*TNS_GAIN_THRESHOLD_LOW

Definition at line 45 of file aacenc_tns.c.

Function Documentation

◆ compress_coeffs()

static int compress_coeffs	(	int *	coef,
		int	order,
		int	c_bits
	)

inlinestatic

Definition at line 47 of file aacenc_tns.c.

Referenced by ff_aac_encode_tns_info().

◆ ff_aac_encode_tns_info()

void ff_aac_encode_tns_info	(	AACEncContext *	s,
		SingleChannelElement *	sce
	)

Encode TNS data.

Coefficient compression is simply not lossless as it should be on any decoder tested and as such is not active.

Definition at line 69 of file aacenc_tns.c.

◆ ff_aac_apply_tns()

void ff_aac_apply_tns	(	AACEncContext *	s,
		SingleChannelElement *	sce
	)

Definition at line 101 of file aacenc_tns.c.

◆ quantize_coefs()

static void quantize_coefs	(	double *	coef,
		int *	idx,
		float *	lpc,
		int	order,
		int	c_bits
	)