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  /frameworks/av/media/libstagefright/codecs/aacdec/
ps_pwr_transient_detection.cpp 197 Int32 peakDiff;
295 peakDiff = *ptr_PrevPeakDiff;
300 peakDiff -= peakDiff >> 2;
310 peakDiff += ((accu - *aPower) >> 2);
315 *(ptr_PrevPeakDiff++) = peakDiff;
321 peakDiff += peakDiff >> 1; /* transient impact factor == 1.5 */
323 if (peakDiff <= nrg)
329 pv_div(nrg, peakDiff, &result)
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  /external/aac/libSBRdec/src/
psdec.cpp 595 FIXP_DBL peakDiff, nrg, transRatio;
681 peakDiff = fMultAdd ( (h_ps_d->specificTo.mpeg.aPrevPeakDiffBin[bin]>>1),
684 /* save peakDiff for the next frame */
685 h_ps_d->specificTo.mpeg.aPrevPeakDiffBin[bin] = peakDiff;
699 if ( peakDiff <= nrg || peakDiff == FL2FXCONST_DBL(0.0) ) {
707 INT scale_left = fixMax(0, CntLeadingZeros(peakDiff) - 1);
708 aaTransRatioSlot[bin] = schur_div( nrg<<scale_left, peakDiff<<scale_left, 16);
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