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