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