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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: line_pe.c
Content: Perceptual entropie module functions
*******************************************************************************/
#include "basic_op.h"
#include "oper_32b.h"
#include "typedef.h"
#include "line_pe.h"
static const Word16 C1_I = 12; /* log(8.0)/log(2) *4 */
static const Word32 C2_I = 10830; /* log(2.5)/log(2) * 1024 * 4 * 2 */
static const Word16 C3_I = 573; /* (1-C2/C1) *1024 */
/*****************************************************************************
*
* function name: prepareSfbPe
* description: constants that do not change during successive pe calculations
*
**********************************************************************************/
void prepareSfbPe(PE_DATA *peData,
PSY_OUT_CHANNEL psyOutChannel[MAX_CHANNELS],
Word16 logSfbEnergy[MAX_CHANNELS][MAX_GROUPED_SFB],
Word16 sfbNRelevantLines[MAX_CHANNELS][MAX_GROUPED_SFB],
const Word16 nChannels,
const Word16 peOffset)
{
Word32 sfbGrp, sfb;
Word32 ch;
for(ch=0; ch<nChannels; ch++) {
PSY_OUT_CHANNEL *psyOutChan = &psyOutChannel[ch];
PE_CHANNEL_DATA *peChanData=&peData->peChannelData[ch];
for(sfbGrp=0;sfbGrp<psyOutChan->sfbCnt; sfbGrp+=psyOutChan->sfbPerGroup){
for (sfb=0; sfb<psyOutChan->maxSfbPerGroup; sfb++) {
peChanData->sfbNLines4[sfbGrp+sfb] = sfbNRelevantLines[ch][sfbGrp+sfb];
sfbNRelevantLines[ch][sfbGrp+sfb] = sfbNRelevantLines[ch][sfbGrp+sfb] >> 2;
peChanData->sfbLdEnergy[sfbGrp+sfb] = logSfbEnergy[ch][sfbGrp+sfb];
}
}
}
peData->offset = peOffset;
}
/*****************************************************************************
*
* function name: calcSfbPe
* description: constPart is sfbPe without the threshold part n*ld(thr) or n*C3*ld(thr)
*
**********************************************************************************/
void calcSfbPe(PE_DATA *peData,
PSY_OUT_CHANNEL psyOutChannel[MAX_CHANNELS],
const Word16 nChannels)
{
Word32 ch;
Word32 sfbGrp, sfb;
Word32 nLines4;
Word32 ldThr, ldRatio;
Word32 pe, constPart, nActiveLines;
peData->pe = peData->offset;
peData->constPart = 0;
peData->nActiveLines = 0;
for(ch=0; ch<nChannels; ch++) {
PSY_OUT_CHANNEL *psyOutChan = &psyOutChannel[ch];
PE_CHANNEL_DATA *peChanData = &peData->peChannelData[ch];
const Word32 *sfbEnergy = psyOutChan->sfbEnergy;
const Word32 *sfbThreshold = psyOutChan->sfbThreshold;
pe = 0;
constPart = 0;
nActiveLines = 0;
for(sfbGrp=0; sfbGrp<psyOutChan->sfbCnt; sfbGrp+=psyOutChan->sfbPerGroup) {
for (sfb=0; sfb<psyOutChan->maxSfbPerGroup; sfb++) {
Word32 nrg = sfbEnergy[sfbGrp+sfb];
Word32 thres = sfbThreshold[sfbGrp+sfb];
Word32 sfbLDEn = peChanData->sfbLdEnergy[sfbGrp+sfb];
if (nrg > thres) {
ldThr = iLog4(thres);
ldRatio = sfbLDEn - ldThr;
nLines4 = peChanData->sfbNLines4[sfbGrp+sfb];
/* sfbPe = nl*log2(en/thr)*/
if (ldRatio >= C1_I) {
peChanData->sfbPe[sfbGrp+sfb] = (nLines4*ldRatio + 8) >> 4;
peChanData->sfbConstPart[sfbGrp+sfb] = ((nLines4*sfbLDEn)) >> 4;
}
else {
/* sfbPe = nl*(c2 + c3*log2(en/thr))*/
peChanData->sfbPe[sfbGrp+sfb] = extract_l((L_mpy_wx(
(C2_I + C3_I * ldRatio * 2) << 4, nLines4) + 4) >> 3);
peChanData->sfbConstPart[sfbGrp+sfb] = extract_l(( L_mpy_wx(
(C2_I + C3_I * sfbLDEn * 2) << 4, nLines4) + 4) >> 3);
nLines4 = (nLines4 * C3_I + (1024<<1)) >> 10;
}
peChanData->sfbNActiveLines[sfbGrp+sfb] = nLines4 >> 2;
}
else {
peChanData->sfbPe[sfbGrp+sfb] = 0;
peChanData->sfbConstPart[sfbGrp+sfb] = 0;
peChanData->sfbNActiveLines[sfbGrp+sfb] = 0;
}
pe = pe + peChanData->sfbPe[sfbGrp+sfb];
constPart = constPart + peChanData->sfbConstPart[sfbGrp+sfb];
nActiveLines = nActiveLines + peChanData->sfbNActiveLines[sfbGrp+sfb];
}
}
peChanData->pe = saturate(pe);
peChanData->constPart = saturate(constPart);
peChanData->nActiveLines = saturate(nActiveLines);
pe += peData->pe;
peData->pe = saturate(pe);
constPart += peData->constPart;
peData->constPart = saturate(constPart);
nActiveLines += peData->nActiveLines;
peData->nActiveLines = saturate(nActiveLines);
}
}
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