low_com.h

来自「ESS3890+SL原代码（1*16内存）」· C头文件 代码 · 共 54 行

/* Copyright 1997, ESS Technology, Inc.                                 */
/* SCCSID @(#)low_com.h	1.1 01/23/02 */

/* Based on DVD code version  	1.4 10/09/01 */


#ifndef __LOWRATE_COMMON_H
#define __LOWRATE_COMMON_H
#include "w_const.h"


/*****************************************************************************/
/* Encoder/Decoder Separation*/
/*****************************************************************************/

/* From lowrate_common.c*/

#ifdef ENABLE_ALL_ENCOPT
/********************************************************************************************/
/* Support routines for Resampling indexes to those used when the MaskQ's were last updated*/
/********************************************************************************************/

/* This more complex setup (with pre-normalization) is required to deal with 56_WMAv2.wma which ends*/
/* with 1.5 seconds of DC bias at -890.  This results in a single large coef at 0 and the rest 0.*/
/* Then in the noise band, iShift tries to be == 33...*/

#define cDitherFactorMR		0x28F5C28F
#define MASKQ_RESAMPLE_OFFSET 6
typedef struct MaskResampleInfo
{
	Int iMaskResampleRatio;
	Int iMaskResampleRatioPow;
	Int cValidBarkBandLatestUpdate;
} MaskResampleInfo;

Int FloatFromFastFloat( FastFloat fflt );
void ffltMaskPower10( Int iMaskQ , FastFloat *fflt);
Int iUnResampleIndex( Int iResampled, const MaskResampleInfo MRI );
Int prvScanForNextBarkIndex( const Int iRecon, Int* piBarkResampled, const int iHighLimit, const Int* const rgiBarkIndexResampled, const MaskResampleInfo MRI );
Int iResampleIndex( Int iRecon, const MaskResampleInfo MRI );
void CoefPlusNoiseInvQuant( const Int iRecon, const Int iCoefQ, I32 qrand,
    const Int* rgiCoefQ, I32* rgiCoefRecon, FastFloat ffltQuantizer, Int iShift );
void FASTFLOAT_MULT(FastFloat ffltA, FastFloat ffltB , FastFloat *out);
void FASTFLOAT_ADD(FastFloat ffltA, FastFloat ffltB, FastFloat *out);
void FastFloat_Div(FastFloat a, FastFloat b, FastFloat *out);
int FASTFLOAT_CMP(FastFloat ffltA, FastFloat ffltB);
int int_sqrt(int x);


#endif  /* ENABLE_ALL_ENCOPT*/


#endif  /* __LOWRATE_COMMON_H*/