114 lines
3.2 KiB
C
114 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: pre_echo_control.c
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Content: Pre echo control functions
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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 "oper_32b.h"
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#include "pre_echo_control.h"
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/*****************************************************************************
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*
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* function name:InitPreEchoControl
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* description: init pre echo control parameter
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*
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*****************************************************************************/
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void InitPreEchoControl(Word32 *pbThresholdNm1,
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Word16 numPb,
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Word32 *pbThresholdQuiet)
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{
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Word16 pb;
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for(pb=0; pb<numPb; pb++) {
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pbThresholdNm1[pb] = pbThresholdQuiet[pb];
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}
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}
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/*****************************************************************************
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*
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* function name:PreEchoControl
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* description: update shreshold to avoid pre echo
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* thr(n) = max(rpmin*thrq(n), min(thrq(n), rpelev*thrq1(n)))
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*
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*
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*****************************************************************************/
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void PreEchoControl(Word32 *pbThresholdNm1,
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Word16 numPb,
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Word32 maxAllowedIncreaseFactor,
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Word16 minRemainingThresholdFactor,
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Word32 *pbThreshold,
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Word16 mdctScale,
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Word16 mdctScalenm1)
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{
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Word32 i;
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Word32 tmpThreshold1, tmpThreshold2;
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Word32 scaling;
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/* maxAllowedIncreaseFactor is hard coded to 2 */
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(void)maxAllowedIncreaseFactor;
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scaling = ((mdctScale - mdctScalenm1) << 1);
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if ( scaling > 0 ) {
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for(i = 0; i < numPb; i++) {
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tmpThreshold1 = pbThresholdNm1[i] >> (scaling-1);
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tmpThreshold2 = L_mpy_ls(pbThreshold[i], minRemainingThresholdFactor);
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/* copy thresholds to internal memory */
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pbThresholdNm1[i] = pbThreshold[i];
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if(pbThreshold[i] > tmpThreshold1) {
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pbThreshold[i] = tmpThreshold1;
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}
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if(tmpThreshold2 > pbThreshold[i]) {
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pbThreshold[i] = tmpThreshold2;
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}
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}
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}
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else {
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scaling = -scaling;
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for(i = 0; i < numPb; i++) {
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tmpThreshold1 = pbThresholdNm1[i] << 1;
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tmpThreshold2 = L_mpy_ls(pbThreshold[i], minRemainingThresholdFactor);
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/* copy thresholds to internal memory */
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pbThresholdNm1[i] = pbThreshold[i];
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if(((pbThreshold[i] >> scaling) > tmpThreshold1)) {
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pbThreshold[i] = tmpThreshold1 << scaling;
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}
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if(tmpThreshold2 > pbThreshold[i]) {
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pbThreshold[i] = tmpThreshold2;
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}
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}
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}
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}
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