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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: band_nrg.c
Content: Band/Line energy calculations functions
*******************************************************************************/
#include "basic_op.h"
#include "band_nrg.h"
#ifndef ARMV5E
/********************************************************************************
*
* function name: CalcBandEnergy
* description: Calc sfb-bandwise mdct-energies for left and right channel
*
**********************************************************************************/
void CalcBandEnergy(const Word32 *mdctSpectrum,
const Word16 *bandOffset,
const Word16 numBands,
Word32 *bandEnergy,
Word32 *bandEnergySum)
{
Word32 i, j;
Word32 accuSum = 0;
for (i=0; i<numBands; i++) {
Word32 accu = 0;
for (j=bandOffset[i]; j<bandOffset[i+1]; j++)
accu = L_add(accu, MULHIGH(mdctSpectrum[j], mdctSpectrum[j]));
accu = L_add(accu, accu);
accuSum = L_add(accuSum, accu);
bandEnergy[i] = accu;
}
*bandEnergySum = accuSum;
}
/********************************************************************************
*
* function name: CalcBandEnergyMS
* description: Calc sfb-bandwise mdct-energies for left add or minus right channel
*
**********************************************************************************/
void CalcBandEnergyMS(const Word32 *mdctSpectrumLeft,
const Word32 *mdctSpectrumRight,
const Word16 *bandOffset,
const Word16 numBands,
Word32 *bandEnergyMid,
Word32 *bandEnergyMidSum,
Word32 *bandEnergySide,
Word32 *bandEnergySideSum)
{
Word32 i, j;
Word32 accuMidSum = 0;
Word32 accuSideSum = 0;
for(i=0; i<numBands; i++) {
Word32 accuMid = 0;
Word32 accuSide = 0;
for (j=bandOffset[i]; j<bandOffset[i+1]; j++) {
Word32 specm, specs;
Word32 l, r;
l = mdctSpectrumLeft[j] >> 1;
r = mdctSpectrumRight[j] >> 1;
specm = l + r;
specs = l - r;
accuMid = L_add(accuMid, MULHIGH(specm, specm));
accuSide = L_add(accuSide, MULHIGH(specs, specs));
}
accuMid = L_add(accuMid, accuMid);
accuSide = L_add(accuSide, accuSide);
bandEnergyMid[i] = accuMid;
accuMidSum = L_add(accuMidSum, accuMid);
bandEnergySide[i] = accuSide;
accuSideSum = L_add(accuSideSum, accuSide);
}
*bandEnergyMidSum = accuMidSum;
*bandEnergySideSum = accuSideSum;
}
#endif
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