aacenc_tns.c File Reference

AAC encoder temporal noise shaping. More...

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

Go to the source code of this file.

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

#define TNS_Q_BITS   4

Definition at line 36 of file aacenc_tns.c.

Referenced by ff_aac_encode_tns_info(), and ff_aac_search_for_tns().

#define TNS_Q_BITS_IS8   4

Definition at line 39 of file aacenc_tns.c.

Referenced by ff_aac_encode_tns_info(), and ff_aac_search_for_tns().

#define TNS_ENABLE_COEF_COMPRESSION

Definition at line 42 of file aacenc_tns.c.

#define TNS_GAIN_THRESHOLD_LOW   1.4f

Definition at line 45 of file aacenc_tns.c.

#define TNS_GAIN_THRESHOLD_HIGH   1.16f*TNS_GAIN_THRESHOLD_LOW

Definition at line 46 of file aacenc_tns.c.

Referenced by ff_aac_search_for_tns().

Function Documentation

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

inlinestatic

Definition at line 48 of file aacenc_tns.c.

Referenced by 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 70 of file aacenc_tns.c.

void ff_aac_apply_tns	(	AACEncContext *	s,
		SingleChannelElement *	sce
	)

Definition at line 102 of file aacenc_tns.c.

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

inlinestatic

Definition at line 147 of file aacenc_tns.c.

Referenced by ff_aac_search_for_tns().

void ff_aac_search_for_tns	(	AACEncContext *	s,
		SingleChannelElement *	sce
	)

Definition at line 161 of file aacenc_tns.c.