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309 lines
11 KiB
C
309 lines
11 KiB
C
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/*
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* Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
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*
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* Use of this source code is governed by a BSD-style license
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* that can be found in the LICENSE file in the root of the source
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* tree. An additional intellectual property rights grant can be found
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* in the file PATENTS. All contributing project authors may
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* be found in the AUTHORS file in the root of the source tree.
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*/
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/******************************************************************
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iLBC Speech Coder ANSI-C Source Code
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WebRtcIlbcfix_DoThePlc.c
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******************************************************************/
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#include "defines.h"
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#include "constants.h"
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#include "comp_corr.h"
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#include "bw_expand.h"
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/*----------------------------------------------------------------*
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* Packet loss concealment routine. Conceals a residual signal
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* and LP parameters. If no packet loss, update state.
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*---------------------------------------------------------------*/
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void WebRtcIlbcfix_DoThePlc(
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int16_t *PLCresidual, /* (o) concealed residual */
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int16_t *PLClpc, /* (o) concealed LP parameters */
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int16_t PLI, /* (i) packet loss indicator
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0 - no PL, 1 = PL */
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int16_t *decresidual, /* (i) decoded residual */
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int16_t *lpc, /* (i) decoded LPC (only used for no PL) */
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int16_t inlag, /* (i) pitch lag */
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iLBC_Dec_Inst_t *iLBCdec_inst
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/* (i/o) decoder instance */
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){
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int16_t i, pick;
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int32_t cross, ener, cross_comp, ener_comp = 0;
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int32_t measure, maxMeasure, energy;
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int16_t max, crossSquareMax, crossSquare;
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int16_t j, lag, tmp1, tmp2, randlag;
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int16_t shift1, shift2, shift3, shiftMax;
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int16_t scale3;
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int16_t corrLen;
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int32_t tmpW32, tmp2W32;
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int16_t use_gain;
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int16_t tot_gain;
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int16_t max_perSquare;
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int16_t scale1, scale2;
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int16_t totscale;
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int32_t nom;
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int16_t denom;
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int16_t pitchfact;
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int16_t use_lag;
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int ind;
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int16_t randvec[BLOCKL_MAX];
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/* Packet Loss */
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if (PLI == 1) {
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(*iLBCdec_inst).consPLICount += 1;
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/* if previous frame not lost,
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determine pitch pred. gain */
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if (iLBCdec_inst->prevPLI != 1) {
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/* Maximum 60 samples are correlated, preserve as high accuracy
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as possible without getting overflow */
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max = WebRtcSpl_MaxAbsValueW16((*iLBCdec_inst).prevResidual, (int16_t)iLBCdec_inst->blockl);
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scale3 = (WebRtcSpl_GetSizeInBits(max)<<1) - 25;
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if (scale3 < 0) {
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scale3 = 0;
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}
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/* Store scale for use when interpolating between the
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* concealment and the received packet */
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iLBCdec_inst->prevScale = scale3;
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/* Search around the previous lag +/-3 to find the
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best pitch period */
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lag = inlag - 3;
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/* Guard against getting outside the frame */
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corrLen = WEBRTC_SPL_MIN(60, iLBCdec_inst->blockl-(inlag+3));
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WebRtcIlbcfix_CompCorr( &cross, &ener,
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iLBCdec_inst->prevResidual, lag, iLBCdec_inst->blockl, corrLen, scale3);
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/* Normalize and store cross^2 and the number of shifts */
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shiftMax = WebRtcSpl_GetSizeInBits(WEBRTC_SPL_ABS_W32(cross))-15;
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crossSquareMax = (int16_t)WEBRTC_SPL_MUL_16_16_RSFT(WEBRTC_SPL_SHIFT_W32(cross, -shiftMax),
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WEBRTC_SPL_SHIFT_W32(cross, -shiftMax), 15);
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for (j=inlag-2;j<=inlag+3;j++) {
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WebRtcIlbcfix_CompCorr( &cross_comp, &ener_comp,
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iLBCdec_inst->prevResidual, j, iLBCdec_inst->blockl, corrLen, scale3);
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/* Use the criteria (corr*corr)/energy to compare if
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this lag is better or not. To avoid the division,
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do a cross multiplication */
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shift1 = WebRtcSpl_GetSizeInBits(WEBRTC_SPL_ABS_W32(cross_comp))-15;
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crossSquare = (int16_t)WEBRTC_SPL_MUL_16_16_RSFT(WEBRTC_SPL_SHIFT_W32(cross_comp, -shift1),
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WEBRTC_SPL_SHIFT_W32(cross_comp, -shift1), 15);
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shift2 = WebRtcSpl_GetSizeInBits(ener)-15;
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measure = WEBRTC_SPL_MUL_16_16(WEBRTC_SPL_SHIFT_W32(ener, -shift2),
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crossSquare);
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shift3 = WebRtcSpl_GetSizeInBits(ener_comp)-15;
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maxMeasure = WEBRTC_SPL_MUL_16_16(WEBRTC_SPL_SHIFT_W32(ener_comp, -shift3),
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crossSquareMax);
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/* Calculate shift value, so that the two measures can
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be put in the same Q domain */
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if(((shiftMax<<1)+shift3) > ((shift1<<1)+shift2)) {
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tmp1 = WEBRTC_SPL_MIN(31, (shiftMax<<1)+shift3-(shift1<<1)-shift2);
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tmp2 = 0;
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} else {
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tmp1 = 0;
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tmp2 = WEBRTC_SPL_MIN(31, (shift1<<1)+shift2-(shiftMax<<1)-shift3);
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}
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if ((measure>>tmp1) > (maxMeasure>>tmp2)) {
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/* New lag is better => record lag, measure and domain */
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lag = j;
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crossSquareMax = crossSquare;
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cross = cross_comp;
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shiftMax = shift1;
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ener = ener_comp;
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}
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}
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/* Calculate the periodicity for the lag with the maximum correlation.
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Definition of the periodicity:
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abs(corr(vec1, vec2))/(sqrt(energy(vec1))*sqrt(energy(vec2)))
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Work in the Square domain to simplify the calculations
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max_perSquare is less than 1 (in Q15)
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*/
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tmp2W32=WebRtcSpl_DotProductWithScale(&iLBCdec_inst->prevResidual[iLBCdec_inst->blockl-corrLen],
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&iLBCdec_inst->prevResidual[iLBCdec_inst->blockl-corrLen],
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corrLen, scale3);
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if ((tmp2W32>0)&&(ener_comp>0)) {
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/* norm energies to int16_t, compute the product of the energies and
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use the upper int16_t as the denominator */
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scale1=(int16_t)WebRtcSpl_NormW32(tmp2W32)-16;
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tmp1=(int16_t)WEBRTC_SPL_SHIFT_W32(tmp2W32, scale1);
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scale2=(int16_t)WebRtcSpl_NormW32(ener)-16;
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tmp2=(int16_t)WEBRTC_SPL_SHIFT_W32(ener, scale2);
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denom=(int16_t)WEBRTC_SPL_MUL_16_16_RSFT(tmp1, tmp2, 16); /* denom in Q(scale1+scale2-16) */
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/* Square the cross correlation and norm it such that max_perSquare
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will be in Q15 after the division */
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totscale = scale1+scale2-1;
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tmp1 = (int16_t)WEBRTC_SPL_SHIFT_W32(cross, (totscale>>1));
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tmp2 = (int16_t)WEBRTC_SPL_SHIFT_W32(cross, totscale-(totscale>>1));
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nom = WEBRTC_SPL_MUL_16_16(tmp1, tmp2);
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max_perSquare = (int16_t)WebRtcSpl_DivW32W16(nom, denom);
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} else {
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max_perSquare = 0;
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}
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}
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/* previous frame lost, use recorded lag and gain */
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else {
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lag = iLBCdec_inst->prevLag;
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max_perSquare = iLBCdec_inst->perSquare;
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}
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/* Attenuate signal and scale down pitch pred gain if
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several frames lost consecutively */
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use_gain = 32767; /* 1.0 in Q15 */
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if (iLBCdec_inst->consPLICount*iLBCdec_inst->blockl>320) {
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use_gain = 29491; /* 0.9 in Q15 */
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} else if (iLBCdec_inst->consPLICount*iLBCdec_inst->blockl>640) {
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use_gain = 22938; /* 0.7 in Q15 */
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} else if (iLBCdec_inst->consPLICount*iLBCdec_inst->blockl>960) {
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use_gain = 16384; /* 0.5 in Q15 */
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} else if (iLBCdec_inst->consPLICount*iLBCdec_inst->blockl>1280) {
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use_gain = 0; /* 0.0 in Q15 */
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}
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/* Compute mixing factor of picth repeatition and noise:
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for max_per>0.7 set periodicity to 1.0
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0.4<max_per<0.7 set periodicity to (maxper-0.4)/0.7-0.4)
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max_per<0.4 set periodicity to 0.0
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*/
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if (max_perSquare>7868) { /* periodicity > 0.7 (0.7^4=0.2401 in Q15) */
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pitchfact = 32767;
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} else if (max_perSquare>839) { /* 0.4 < periodicity < 0.7 (0.4^4=0.0256 in Q15) */
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/* find best index and interpolate from that */
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ind = 5;
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while ((max_perSquare<WebRtcIlbcfix_kPlcPerSqr[ind])&&(ind>0)) {
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ind--;
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}
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/* pitch fact is approximated by first order */
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tmpW32 = (int32_t)WebRtcIlbcfix_kPlcPitchFact[ind] +
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WEBRTC_SPL_MUL_16_16_RSFT(WebRtcIlbcfix_kPlcPfSlope[ind], (max_perSquare-WebRtcIlbcfix_kPlcPerSqr[ind]), 11);
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pitchfact = (int16_t)WEBRTC_SPL_MIN(tmpW32, 32767); /* guard against overflow */
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} else { /* periodicity < 0.4 */
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pitchfact = 0;
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}
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/* avoid repetition of same pitch cycle (buzzyness) */
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use_lag = lag;
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if (lag<80) {
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use_lag = 2*lag;
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}
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/* compute concealed residual */
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energy = 0;
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for (i=0; i<iLBCdec_inst->blockl; i++) {
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/* noise component - 52 < randlagFIX < 117 */
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iLBCdec_inst->seed = (int16_t)(WEBRTC_SPL_MUL_16_16(iLBCdec_inst->seed, 31821)+(int32_t)13849);
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randlag = 53 + (int16_t)(iLBCdec_inst->seed & 63);
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pick = i - randlag;
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if (pick < 0) {
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randvec[i] = iLBCdec_inst->prevResidual[iLBCdec_inst->blockl+pick];
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} else {
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randvec[i] = iLBCdec_inst->prevResidual[pick];
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}
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/* pitch repeatition component */
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pick = i - use_lag;
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if (pick < 0) {
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PLCresidual[i] = iLBCdec_inst->prevResidual[iLBCdec_inst->blockl+pick];
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} else {
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PLCresidual[i] = PLCresidual[pick];
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}
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/* Attinuate total gain for each 10 ms */
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if (i<80) {
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tot_gain=use_gain;
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} else if (i<160) {
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tot_gain=(int16_t)WEBRTC_SPL_MUL_16_16_RSFT(31130, use_gain, 15); /* 0.95*use_gain */
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} else {
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tot_gain=(int16_t)WEBRTC_SPL_MUL_16_16_RSFT(29491, use_gain, 15); /* 0.9*use_gain */
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}
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/* mix noise and pitch repeatition */
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PLCresidual[i] = (int16_t)WEBRTC_SPL_MUL_16_16_RSFT(tot_gain,
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(int16_t)WEBRTC_SPL_RSHIFT_W32( (WEBRTC_SPL_MUL_16_16(pitchfact, PLCresidual[i]) +
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WEBRTC_SPL_MUL_16_16((32767-pitchfact), randvec[i]) + 16384),
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15),
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15);
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/* Shifting down the result one step extra to ensure that no overflow
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will occur */
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energy += WEBRTC_SPL_MUL_16_16_RSFT(PLCresidual[i],
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PLCresidual[i], (iLBCdec_inst->prevScale+1));
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}
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/* less than 30 dB, use only noise */
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if (energy < (WEBRTC_SPL_SHIFT_W32(((int32_t)iLBCdec_inst->blockl*900),-(iLBCdec_inst->prevScale+1)))) {
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energy = 0;
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for (i=0; i<iLBCdec_inst->blockl; i++) {
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PLCresidual[i] = randvec[i];
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}
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}
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/* use the old LPC */
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WEBRTC_SPL_MEMCPY_W16(PLClpc, (*iLBCdec_inst).prevLpc, LPC_FILTERORDER+1);
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/* Update state in case there are multiple frame losses */
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iLBCdec_inst->prevLag = lag;
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iLBCdec_inst->perSquare = max_perSquare;
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}
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/* no packet loss, copy input */
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else {
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WEBRTC_SPL_MEMCPY_W16(PLCresidual, decresidual, iLBCdec_inst->blockl);
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WEBRTC_SPL_MEMCPY_W16(PLClpc, lpc, (LPC_FILTERORDER+1));
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iLBCdec_inst->consPLICount = 0;
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}
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/* update state */
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iLBCdec_inst->prevPLI = PLI;
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WEBRTC_SPL_MEMCPY_W16(iLBCdec_inst->prevLpc, PLClpc, (LPC_FILTERORDER+1));
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WEBRTC_SPL_MEMCPY_W16(iLBCdec_inst->prevResidual, PLCresidual, iLBCdec_inst->blockl);
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return;
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}
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