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/*
** Copyright 2003-2010, VisualOn, Inc.
**
** Licensed under the Apache License, Version 2.0 (the "License");
** you may not use this file except in compliance with the License.
** You may obtain a copy of the License at
**
** http://www.apache.org/licenses/LICENSE-2.0
**
** Unless required by applicable law or agreed to in writing, software
** distributed under the License is distributed on an "AS IS" BASIS,
** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
** See the License for the specific language governing permissions and
** limitations under the License.
*/
/*******************************************************************************
File: ms_stereo.c
Content: MS stereo processing function
*******************************************************************************/
#include "basic_op.h"
#include "oper_32b.h"
#include "psy_const.h"
#include "ms_stereo.h"
/********************************************************************************
*
* function name: MsStereoProcessing
* description: detect use ms stereo or not
* if ((min(thrLn, thrRn)*min(thrLn, thrRn))/(enMn*enSn))
* >= ((thrLn *thrRn)/(enLn*enRn)) then ms stereo
*
**********************************************************************************/
void MsStereoProcessing(Word32 *sfbEnergyLeft,
Word32 *sfbEnergyRight,
const Word32 *sfbEnergyMid,
const Word32 *sfbEnergySide,
Word32 *mdctSpectrumLeft,
Word32 *mdctSpectrumRight,
Word32 *sfbThresholdLeft,
Word32 *sfbThresholdRight,
Word32 *sfbSpreadedEnLeft,
Word32 *sfbSpreadedEnRight,
Word16 *msDigest,
Word16 *msMask,
const Word16 sfbCnt,
const Word16 sfbPerGroup,
const Word16 maxSfbPerGroup,
const Word16 *sfbOffset) {
Word32 sfb,sfboffs, j;
Word32 msMaskTrueSomewhere = 0;
Word32 msMaskFalseSomewhere = 0;
for (sfb=0; sfb<sfbCnt; sfb+=sfbPerGroup) {
for (sfboffs=0;sfboffs<maxSfbPerGroup;sfboffs++) {
Word32 temp;
Word32 pnlr,pnms;
Word32 minThreshold;
Word32 thrL, thrR, nrgL, nrgR;
Word32 idx, shift;
idx = sfb + sfboffs;
thrL = sfbThresholdLeft[idx];
thrR = sfbThresholdRight[idx];
nrgL = sfbEnergyLeft[idx];
nrgR = sfbEnergyRight[idx];
minThreshold = min(thrL, thrR);
nrgL = max(nrgL,thrL) + 1;
shift = norm_l(nrgL);
nrgL = Div_32(thrL << shift, nrgL << shift);
nrgR = max(nrgR,thrR) + 1;
shift = norm_l(nrgR);
nrgR = Div_32(thrR << shift, nrgR << shift);
pnlr = fixmul(nrgL, nrgR);
nrgL = sfbEnergyMid[idx];
nrgR = sfbEnergySide[idx];
nrgL = max(nrgL,minThreshold) + 1;
shift = norm_l(nrgL);
nrgL = Div_32(minThreshold << shift, nrgL << shift);
nrgR = max(nrgR,minThreshold) + 1;
shift = norm_l(nrgR);
nrgR = Div_32(minThreshold << shift, nrgR << shift);
pnms = fixmul(nrgL, nrgR);
temp = (pnlr + 1) / ((pnms >> 8) + 1);
temp = pnms - pnlr;
if( temp > 0 ){
msMask[idx] = 1;
msMaskTrueSomewhere = 1;
for (j=sfbOffset[idx]; j<sfbOffset[idx+1]; j++) {
Word32 left, right;
left = (mdctSpectrumLeft[j] >> 1);
right = (mdctSpectrumRight[j] >> 1);
mdctSpectrumLeft[j] = left + right;
mdctSpectrumRight[j] = left - right;
}
sfbThresholdLeft[idx] = minThreshold;
sfbThresholdRight[idx] = minThreshold;
sfbEnergyLeft[idx] = sfbEnergyMid[idx];
sfbEnergyRight[idx] = sfbEnergySide[idx];
sfbSpreadedEnRight[idx] = min(sfbSpreadedEnLeft[idx],sfbSpreadedEnRight[idx]) >> 1;
sfbSpreadedEnLeft[idx] = sfbSpreadedEnRight[idx];
}
else {
msMask[idx] = 0;
msMaskFalseSomewhere = 1;
}
}
if ( msMaskTrueSomewhere ) {
if(msMaskFalseSomewhere ) {
*msDigest = SI_MS_MASK_SOME;
} else {
*msDigest = SI_MS_MASK_ALL;
}
} else {
*msDigest = SI_MS_MASK_NONE;
}
}
}
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