53 lines
1.8 KiB
C
53 lines
1.8 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: spreading.c
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Content: Spreading of energy 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 "spreading.h"
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/*********************************************************************************
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*
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* function name: SpreadingMax
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* description: spreading the energy
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* higher frequencies thr(n) = max(thr(n), sh(n)*thr(n-1))
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* lower frequencies thr(n) = max(thr(n), sl(n)*thr(n+1))
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*
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**********************************************************************************/
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void SpreadingMax(const Word16 pbCnt,
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const Word16 *maskLowFactor,
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const Word16 *maskHighFactor,
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Word32 *pbSpreadedEnergy)
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{
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Word32 i;
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/* slope to higher frequencies */
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for (i=1; i<pbCnt; i++) {
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pbSpreadedEnergy[i] = max(pbSpreadedEnergy[i],
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L_mpy_ls(pbSpreadedEnergy[i-1], maskHighFactor[i]));
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}
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/* slope to lower frequencies */
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for (i=pbCnt - 2; i>=0; i--) {
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pbSpreadedEnergy[i] = max(pbSpreadedEnergy[i],
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L_mpy_ls(pbSpreadedEnergy[i+1], maskLowFactor[i]));
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}
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}
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