aacsbr.c File Reference

#include "aac.h"
#include "sbr.h"
#include "aacsbr.h"
#include "aacsbrdata.h"
#include "aacps.h"
#include "sbrdsp.h"
#include "libavutil/internal.h"
#include "libavutil/intfloat.h"
#include "libavutil/libm.h"
#include "libavutil/avassert.h"
#include "libavutil/mem_internal.h"
#include <stdint.h>
#include <float.h>
#include <math.h>
#include "aacsbr_template.c"

Go to the source code of this file.

Macros
#define	USE_FIXED   0

Functions
static av_always_inline float	exp2fi (int x)
	2^(x) for integer x More...
static void	aacsbr_func_ptr_init (AACSBRContext *c)
static void	make_bands (int16_t *bands, int start, int stop, int num_bands)
static void	sbr_dequant (SpectralBandReplication *sbr, int id_aac)
	Dequantization and stereo decoding (14496-3 sp04 p203) More...
static void	sbr_hf_inverse_filter (SBRDSPContext *dsp, float(*alpha0)[2], float(*alpha1)[2], const float X_low[32][40][2], int k0)
	High Frequency Generation (14496-3 sp04 p214+) and Inverse Filtering (14496-3 sp04 p214) Warning: This routine does not seem numerically stable. More...
static void	sbr_chirp (SpectralBandReplication *sbr, SBRData *ch_data)
	Chirp Factors (14496-3 sp04 p214) More...
static void	sbr_gain_calc (SpectralBandReplication *sbr, SBRData *ch_data, const int e_a[2])
	Calculation of levels of additional HF signal components (14496-3 sp04 p219) and Calculation of gain (14496-3 sp04 p219) More...
static void	sbr_hf_assemble (float Y1[38][64][2], const float X_high[64][40][2], SpectralBandReplication *sbr, SBRData *ch_data, const int e_a[2])
	Assembling HF Signals (14496-3 sp04 p220) More...

Detailed Description

AAC Spectral Band Replication decoding functions

Author

Robert Swain ( rob opendot cl )

Definition in file aacsbr.c.

Macro Definition Documentation

USE_FIXED

#define USE_FIXED   0

Definition at line 28 of file aacsbr.c.

Function Documentation

exp2fi()

static av_always_inline float exp2fi ( int  x )

static

2^(x) for integer x

Returns

correctly rounded float

Definition at line 54 of file aacsbr.c.

Referenced by sbr_dequant().

aacsbr_func_ptr_init()

static void aacsbr_func_ptr_init ( AACSBRContext *  c )

static

make_bands()

static void make_bands ( int16_t *  bands, int  start, int  stop, int  num_bands  )

static

Definition at line 71 of file aacsbr.c.

Referenced by sbr_make_f_master().

sbr_dequant()

static void sbr_dequant ( SpectralBandReplication *  sbr, int  id_aac  )

static

Dequantization and stereo decoding (14496-3 sp04 p203)

Definition at line 90 of file aacsbr.c.

Referenced by ff_sbr_apply().

sbr_hf_inverse_filter()

static void sbr_hf_inverse_filter ( SBRDSPContext *  dsp, float(*)  alpha0[2], float(*)  alpha1[2], const float  X_low[32][40][2], int  k0  )

static

High Frequency Generation (14496-3 sp04 p214+) and Inverse Filtering (14496-3 sp04 p214) Warning: This routine does not seem numerically stable.

Definition at line 157 of file aacsbr.c.

Referenced by aacsbr_func_ptr_init().

sbr_chirp()

static void sbr_chirp ( SpectralBandReplication *  sbr, SBRData *  ch_data  )

static

Chirp Factors (14496-3 sp04 p214)

Definition at line 212 of file aacsbr.c.

Referenced by ff_sbr_apply().

sbr_gain_calc()

static void sbr_gain_calc ( SpectralBandReplication *  sbr, SBRData *  ch_data, const int  e_a[2]  )

static

Calculation of levels of additional HF signal components (14496-3 sp04 p219) and Calculation of gain (14496-3 sp04 p219)

Definition at line 236 of file aacsbr.c.

Referenced by ff_sbr_apply().

sbr_hf_assemble()

static void sbr_hf_assemble ( float  Y1[38][64][2], const float  X_high[64][40][2], SpectralBandReplication *  sbr, SBRData *  ch_data, const int  e_a[2]  )

static

Assembling HF Signals (14496-3 sp04 p220)

Definition at line 293 of file aacsbr.c.

Referenced by aacsbr_func_ptr_init().