mirror of
https://github.com/oxen-io/session-android.git
synced 2024-12-28 10:47:46 +00:00
309 lines
11 KiB
C
309 lines
11 KiB
C
/*
|
|
* Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
|
|
*
|
|
* Use of this source code is governed by a BSD-style license
|
|
* that can be found in the LICENSE file in the root of the source
|
|
* tree. An additional intellectual property rights grant can be found
|
|
* in the file PATENTS. All contributing project authors may
|
|
* be found in the AUTHORS file in the root of the source tree.
|
|
*/
|
|
|
|
/******************************************************************
|
|
|
|
iLBC Speech Coder ANSI-C Source Code
|
|
|
|
WebRtcIlbcfix_DoThePlc.c
|
|
|
|
******************************************************************/
|
|
|
|
#include "defines.h"
|
|
#include "constants.h"
|
|
#include "comp_corr.h"
|
|
#include "bw_expand.h"
|
|
|
|
/*----------------------------------------------------------------*
|
|
* Packet loss concealment routine. Conceals a residual signal
|
|
* and LP parameters. If no packet loss, update state.
|
|
*---------------------------------------------------------------*/
|
|
|
|
void WebRtcIlbcfix_DoThePlc(
|
|
int16_t *PLCresidual, /* (o) concealed residual */
|
|
int16_t *PLClpc, /* (o) concealed LP parameters */
|
|
int16_t PLI, /* (i) packet loss indicator
|
|
0 - no PL, 1 = PL */
|
|
int16_t *decresidual, /* (i) decoded residual */
|
|
int16_t *lpc, /* (i) decoded LPC (only used for no PL) */
|
|
int16_t inlag, /* (i) pitch lag */
|
|
iLBC_Dec_Inst_t *iLBCdec_inst
|
|
/* (i/o) decoder instance */
|
|
){
|
|
int16_t i, pick;
|
|
int32_t cross, ener, cross_comp, ener_comp = 0;
|
|
int32_t measure, maxMeasure, energy;
|
|
int16_t max, crossSquareMax, crossSquare;
|
|
int16_t j, lag, tmp1, tmp2, randlag;
|
|
int16_t shift1, shift2, shift3, shiftMax;
|
|
int16_t scale3;
|
|
int16_t corrLen;
|
|
int32_t tmpW32, tmp2W32;
|
|
int16_t use_gain;
|
|
int16_t tot_gain;
|
|
int16_t max_perSquare;
|
|
int16_t scale1, scale2;
|
|
int16_t totscale;
|
|
int32_t nom;
|
|
int16_t denom;
|
|
int16_t pitchfact;
|
|
int16_t use_lag;
|
|
int ind;
|
|
int16_t randvec[BLOCKL_MAX];
|
|
|
|
/* Packet Loss */
|
|
if (PLI == 1) {
|
|
|
|
(*iLBCdec_inst).consPLICount += 1;
|
|
|
|
/* if previous frame not lost,
|
|
determine pitch pred. gain */
|
|
|
|
if (iLBCdec_inst->prevPLI != 1) {
|
|
|
|
/* Maximum 60 samples are correlated, preserve as high accuracy
|
|
as possible without getting overflow */
|
|
max = WebRtcSpl_MaxAbsValueW16((*iLBCdec_inst).prevResidual, (int16_t)iLBCdec_inst->blockl);
|
|
scale3 = (WebRtcSpl_GetSizeInBits(max)<<1) - 25;
|
|
if (scale3 < 0) {
|
|
scale3 = 0;
|
|
}
|
|
|
|
/* Store scale for use when interpolating between the
|
|
* concealment and the received packet */
|
|
iLBCdec_inst->prevScale = scale3;
|
|
|
|
/* Search around the previous lag +/-3 to find the
|
|
best pitch period */
|
|
lag = inlag - 3;
|
|
|
|
/* Guard against getting outside the frame */
|
|
corrLen = WEBRTC_SPL_MIN(60, iLBCdec_inst->blockl-(inlag+3));
|
|
|
|
WebRtcIlbcfix_CompCorr( &cross, &ener,
|
|
iLBCdec_inst->prevResidual, lag, iLBCdec_inst->blockl, corrLen, scale3);
|
|
|
|
/* Normalize and store cross^2 and the number of shifts */
|
|
shiftMax = WebRtcSpl_GetSizeInBits(WEBRTC_SPL_ABS_W32(cross))-15;
|
|
crossSquareMax = (int16_t)WEBRTC_SPL_MUL_16_16_RSFT(WEBRTC_SPL_SHIFT_W32(cross, -shiftMax),
|
|
WEBRTC_SPL_SHIFT_W32(cross, -shiftMax), 15);
|
|
|
|
for (j=inlag-2;j<=inlag+3;j++) {
|
|
WebRtcIlbcfix_CompCorr( &cross_comp, &ener_comp,
|
|
iLBCdec_inst->prevResidual, j, iLBCdec_inst->blockl, corrLen, scale3);
|
|
|
|
/* Use the criteria (corr*corr)/energy to compare if
|
|
this lag is better or not. To avoid the division,
|
|
do a cross multiplication */
|
|
shift1 = WebRtcSpl_GetSizeInBits(WEBRTC_SPL_ABS_W32(cross_comp))-15;
|
|
crossSquare = (int16_t)WEBRTC_SPL_MUL_16_16_RSFT(WEBRTC_SPL_SHIFT_W32(cross_comp, -shift1),
|
|
WEBRTC_SPL_SHIFT_W32(cross_comp, -shift1), 15);
|
|
|
|
shift2 = WebRtcSpl_GetSizeInBits(ener)-15;
|
|
measure = WEBRTC_SPL_MUL_16_16(WEBRTC_SPL_SHIFT_W32(ener, -shift2),
|
|
crossSquare);
|
|
|
|
shift3 = WebRtcSpl_GetSizeInBits(ener_comp)-15;
|
|
maxMeasure = WEBRTC_SPL_MUL_16_16(WEBRTC_SPL_SHIFT_W32(ener_comp, -shift3),
|
|
crossSquareMax);
|
|
|
|
/* Calculate shift value, so that the two measures can
|
|
be put in the same Q domain */
|
|
if(((shiftMax<<1)+shift3) > ((shift1<<1)+shift2)) {
|
|
tmp1 = WEBRTC_SPL_MIN(31, (shiftMax<<1)+shift3-(shift1<<1)-shift2);
|
|
tmp2 = 0;
|
|
} else {
|
|
tmp1 = 0;
|
|
tmp2 = WEBRTC_SPL_MIN(31, (shift1<<1)+shift2-(shiftMax<<1)-shift3);
|
|
}
|
|
|
|
if ((measure>>tmp1) > (maxMeasure>>tmp2)) {
|
|
/* New lag is better => record lag, measure and domain */
|
|
lag = j;
|
|
crossSquareMax = crossSquare;
|
|
cross = cross_comp;
|
|
shiftMax = shift1;
|
|
ener = ener_comp;
|
|
}
|
|
}
|
|
|
|
/* Calculate the periodicity for the lag with the maximum correlation.
|
|
|
|
Definition of the periodicity:
|
|
abs(corr(vec1, vec2))/(sqrt(energy(vec1))*sqrt(energy(vec2)))
|
|
|
|
Work in the Square domain to simplify the calculations
|
|
max_perSquare is less than 1 (in Q15)
|
|
*/
|
|
tmp2W32=WebRtcSpl_DotProductWithScale(&iLBCdec_inst->prevResidual[iLBCdec_inst->blockl-corrLen],
|
|
&iLBCdec_inst->prevResidual[iLBCdec_inst->blockl-corrLen],
|
|
corrLen, scale3);
|
|
|
|
if ((tmp2W32>0)&&(ener_comp>0)) {
|
|
/* norm energies to int16_t, compute the product of the energies and
|
|
use the upper int16_t as the denominator */
|
|
|
|
scale1=(int16_t)WebRtcSpl_NormW32(tmp2W32)-16;
|
|
tmp1=(int16_t)WEBRTC_SPL_SHIFT_W32(tmp2W32, scale1);
|
|
|
|
scale2=(int16_t)WebRtcSpl_NormW32(ener)-16;
|
|
tmp2=(int16_t)WEBRTC_SPL_SHIFT_W32(ener, scale2);
|
|
denom=(int16_t)WEBRTC_SPL_MUL_16_16_RSFT(tmp1, tmp2, 16); /* denom in Q(scale1+scale2-16) */
|
|
|
|
/* Square the cross correlation and norm it such that max_perSquare
|
|
will be in Q15 after the division */
|
|
|
|
totscale = scale1+scale2-1;
|
|
tmp1 = (int16_t)WEBRTC_SPL_SHIFT_W32(cross, (totscale>>1));
|
|
tmp2 = (int16_t)WEBRTC_SPL_SHIFT_W32(cross, totscale-(totscale>>1));
|
|
|
|
nom = WEBRTC_SPL_MUL_16_16(tmp1, tmp2);
|
|
max_perSquare = (int16_t)WebRtcSpl_DivW32W16(nom, denom);
|
|
|
|
} else {
|
|
max_perSquare = 0;
|
|
}
|
|
}
|
|
|
|
/* previous frame lost, use recorded lag and gain */
|
|
|
|
else {
|
|
lag = iLBCdec_inst->prevLag;
|
|
max_perSquare = iLBCdec_inst->perSquare;
|
|
}
|
|
|
|
/* Attenuate signal and scale down pitch pred gain if
|
|
several frames lost consecutively */
|
|
|
|
use_gain = 32767; /* 1.0 in Q15 */
|
|
|
|
if (iLBCdec_inst->consPLICount*iLBCdec_inst->blockl>320) {
|
|
use_gain = 29491; /* 0.9 in Q15 */
|
|
} else if (iLBCdec_inst->consPLICount*iLBCdec_inst->blockl>640) {
|
|
use_gain = 22938; /* 0.7 in Q15 */
|
|
} else if (iLBCdec_inst->consPLICount*iLBCdec_inst->blockl>960) {
|
|
use_gain = 16384; /* 0.5 in Q15 */
|
|
} else if (iLBCdec_inst->consPLICount*iLBCdec_inst->blockl>1280) {
|
|
use_gain = 0; /* 0.0 in Q15 */
|
|
}
|
|
|
|
/* Compute mixing factor of picth repeatition and noise:
|
|
for max_per>0.7 set periodicity to 1.0
|
|
0.4<max_per<0.7 set periodicity to (maxper-0.4)/0.7-0.4)
|
|
max_per<0.4 set periodicity to 0.0
|
|
*/
|
|
|
|
if (max_perSquare>7868) { /* periodicity > 0.7 (0.7^4=0.2401 in Q15) */
|
|
pitchfact = 32767;
|
|
} else if (max_perSquare>839) { /* 0.4 < periodicity < 0.7 (0.4^4=0.0256 in Q15) */
|
|
/* find best index and interpolate from that */
|
|
ind = 5;
|
|
while ((max_perSquare<WebRtcIlbcfix_kPlcPerSqr[ind])&&(ind>0)) {
|
|
ind--;
|
|
}
|
|
/* pitch fact is approximated by first order */
|
|
tmpW32 = (int32_t)WebRtcIlbcfix_kPlcPitchFact[ind] +
|
|
WEBRTC_SPL_MUL_16_16_RSFT(WebRtcIlbcfix_kPlcPfSlope[ind], (max_perSquare-WebRtcIlbcfix_kPlcPerSqr[ind]), 11);
|
|
|
|
pitchfact = (int16_t)WEBRTC_SPL_MIN(tmpW32, 32767); /* guard against overflow */
|
|
|
|
} else { /* periodicity < 0.4 */
|
|
pitchfact = 0;
|
|
}
|
|
|
|
/* avoid repetition of same pitch cycle (buzzyness) */
|
|
use_lag = lag;
|
|
if (lag<80) {
|
|
use_lag = 2*lag;
|
|
}
|
|
|
|
/* compute concealed residual */
|
|
energy = 0;
|
|
|
|
for (i=0; i<iLBCdec_inst->blockl; i++) {
|
|
|
|
/* noise component - 52 < randlagFIX < 117 */
|
|
iLBCdec_inst->seed = (int16_t)(WEBRTC_SPL_MUL_16_16(iLBCdec_inst->seed, 31821)+(int32_t)13849);
|
|
randlag = 53 + (int16_t)(iLBCdec_inst->seed & 63);
|
|
|
|
pick = i - randlag;
|
|
|
|
if (pick < 0) {
|
|
randvec[i] = iLBCdec_inst->prevResidual[iLBCdec_inst->blockl+pick];
|
|
} else {
|
|
randvec[i] = iLBCdec_inst->prevResidual[pick];
|
|
}
|
|
|
|
/* pitch repeatition component */
|
|
pick = i - use_lag;
|
|
|
|
if (pick < 0) {
|
|
PLCresidual[i] = iLBCdec_inst->prevResidual[iLBCdec_inst->blockl+pick];
|
|
} else {
|
|
PLCresidual[i] = PLCresidual[pick];
|
|
}
|
|
|
|
/* Attinuate total gain for each 10 ms */
|
|
if (i<80) {
|
|
tot_gain=use_gain;
|
|
} else if (i<160) {
|
|
tot_gain=(int16_t)WEBRTC_SPL_MUL_16_16_RSFT(31130, use_gain, 15); /* 0.95*use_gain */
|
|
} else {
|
|
tot_gain=(int16_t)WEBRTC_SPL_MUL_16_16_RSFT(29491, use_gain, 15); /* 0.9*use_gain */
|
|
}
|
|
|
|
|
|
/* mix noise and pitch repeatition */
|
|
|
|
PLCresidual[i] = (int16_t)WEBRTC_SPL_MUL_16_16_RSFT(tot_gain,
|
|
(int16_t)WEBRTC_SPL_RSHIFT_W32( (WEBRTC_SPL_MUL_16_16(pitchfact, PLCresidual[i]) +
|
|
WEBRTC_SPL_MUL_16_16((32767-pitchfact), randvec[i]) + 16384),
|
|
15),
|
|
15);
|
|
|
|
/* Shifting down the result one step extra to ensure that no overflow
|
|
will occur */
|
|
energy += WEBRTC_SPL_MUL_16_16_RSFT(PLCresidual[i],
|
|
PLCresidual[i], (iLBCdec_inst->prevScale+1));
|
|
|
|
}
|
|
|
|
/* less than 30 dB, use only noise */
|
|
if (energy < (WEBRTC_SPL_SHIFT_W32(((int32_t)iLBCdec_inst->blockl*900),-(iLBCdec_inst->prevScale+1)))) {
|
|
energy = 0;
|
|
for (i=0; i<iLBCdec_inst->blockl; i++) {
|
|
PLCresidual[i] = randvec[i];
|
|
}
|
|
}
|
|
|
|
/* use the old LPC */
|
|
WEBRTC_SPL_MEMCPY_W16(PLClpc, (*iLBCdec_inst).prevLpc, LPC_FILTERORDER+1);
|
|
|
|
/* Update state in case there are multiple frame losses */
|
|
iLBCdec_inst->prevLag = lag;
|
|
iLBCdec_inst->perSquare = max_perSquare;
|
|
}
|
|
|
|
/* no packet loss, copy input */
|
|
|
|
else {
|
|
WEBRTC_SPL_MEMCPY_W16(PLCresidual, decresidual, iLBCdec_inst->blockl);
|
|
WEBRTC_SPL_MEMCPY_W16(PLClpc, lpc, (LPC_FILTERORDER+1));
|
|
iLBCdec_inst->consPLICount = 0;
|
|
}
|
|
|
|
/* update state */
|
|
iLBCdec_inst->prevPLI = PLI;
|
|
WEBRTC_SPL_MEMCPY_W16(iLBCdec_inst->prevLpc, PLClpc, (LPC_FILTERORDER+1));
|
|
WEBRTC_SPL_MEMCPY_W16(iLBCdec_inst->prevResidual, PLCresidual, iLBCdec_inst->blockl);
|
|
|
|
return;
|
|
}
|