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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: spreading.c
Content: Spreading of energy function
*******************************************************************************/
#include "basic_op.h"
#include "oper_32b.h"
#include "spreading.h"
/*********************************************************************************
*
* function name: SpreadingMax
* description: spreading the energy
* higher frequencies thr(n) = max(thr(n), sh(n)*thr(n-1))
* lower frequencies thr(n) = max(thr(n), sl(n)*thr(n+1))
*
**********************************************************************************/
void SpreadingMax(const Word16 pbCnt,
const Word16 *maskLowFactor,
const Word16 *maskHighFactor,
Word32 *pbSpreadedEnergy)
{
Word32 i;
/* slope to higher frequencies */
for (i=1; i<pbCnt; i++) {
pbSpreadedEnergy[i] = max(pbSpreadedEnergy[i],
L_mpy_ls(pbSpreadedEnergy[i-1], maskHighFactor[i]));
}
/* slope to lower frequencies */
for (i=pbCnt - 2; i>=0; i--) {
pbSpreadedEnergy[i] = max(pbSpreadedEnergy[i],
L_mpy_ls(pbSpreadedEnergy[i+1], maskLowFactor[i]));
}
}
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