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gfiber / vendor / opensource / webrtc / d73f3b5ff617e5b395e2af72e29289b87a1873e9 / . / trunk / src / modules / audio_coding / codecs / iSAC / main / source / entropy_coding.c
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/*
* 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.
*/
/*
* entropy_coding.c
*
* This header file defines all of the functions used to arithmetically
* encode the iSAC bistream
*
*/
#include "entropy_coding.h"
#include "settings.h"
#include "arith_routines.h"
#include "signal_processing_library.h"
#include "spectrum_ar_model_tables.h"
#include "lpc_tables.h"
#include "pitch_gain_tables.h"
#include "pitch_lag_tables.h"
#include "encode_lpc_swb.h"
#include "lpc_shape_swb12_tables.h"
#include "lpc_shape_swb16_tables.h"
#include "lpc_gain_swb_tables.h"
#include "os_specific_inline.h"
#include <math.h>
#include <string.h>
static const WebRtc_UWord16 kLpcVecPerSegmentUb12 = 5;
static const WebRtc_UWord16 kLpcVecPerSegmentUb16 = 4;
/* coefficients for the stepwise rate estimation */
static const WebRtc_Word32 kRPointsQ10[100] = {
14495, 14295, 14112, 13944, 13788, 13643, 13459, 13276, 13195, 13239,
13243, 13191, 13133, 13216, 13263, 13330, 13316, 13242, 13191, 13106,
12942, 12669, 12291, 11840, 11361, 10795, 10192, 9561, 8934, 8335,
7750, 7161, 6589, 6062, 5570, 5048, 4548, 4069, 3587, 3143,
2717, 2305, 1915, 1557, 1235, 963, 720, 541, 423, 366,
369, 435, 561, 750, 1001, 1304, 1626, 1989, 2381, 2793,
3219, 3656, 4134, 4612, 5106, 5629, 6122, 6644, 7216, 7801,
8386, 8987, 9630, 10255, 10897, 11490, 11950, 12397, 12752, 12999,
13175, 13258, 13323, 13290, 13296, 13335, 13113, 13255, 13347, 13355,
13298, 13247, 13313, 13155, 13267, 13313, 13374, 13446, 13525, 13609};
/* cdf array for encoder bandwidth (12 vs 16 kHz) indicator */
static const WebRtc_UWord16 kOneBitEqualProbCdf[3] = {
0, 32768, 65535 };
/* pointer to cdf array for encoder bandwidth (12 vs 16 kHz) indicator */
static const WebRtc_UWord16 *kOneBitEqualProbCdf_ptr[1] = {
kOneBitEqualProbCdf };
/* initial cdf index for decoder of encoded bandwidth (12 vs 16 kHz) indicator */
static const WebRtc_UWord16 kOneBitEqualProbInitIndex[1] = {1};
/* coefficients for the stepwise rate estimation */
static const WebRtc_Word32 acnQ10 = 426;
static const WebRtc_Word32 bcnQ10 = -581224;
static const WebRtc_Word32 ccnQ10 = 722631;
static const WebRtc_Word32 lbcnQ10 = -402874;
#define DPMIN_Q10 -10240 // -10.00 in Q10
#define DPMAX_Q10 10240 // 10.00 in Q10
#define MINBITS_Q10 10240 /* 10.0 in Q10 */
#define IS_SWB_12KHZ 1
__inline WebRtc_UWord32 stepwise(WebRtc_Word32 dinQ10) {
WebRtc_Word32 ind, diQ10, dtQ10;
diQ10 = dinQ10;
if (diQ10 < DPMIN_Q10)
diQ10 = DPMIN_Q10;
if (diQ10 >= DPMAX_Q10)
diQ10 = DPMAX_Q10 - 1;
dtQ10 = diQ10 - DPMIN_Q10; /* Q10 + Q10 = Q10 */
ind = (dtQ10 * 5) >> 10; /* 2^10 / 5 = 0.2 in Q10 */
/* Q10 -> Q0 */
return kRPointsQ10[ind];
}
__inline short log2_Q10_B( int x )
{
int zeros;
short frac;
zeros = WebRtcSpl_NormU32( x );
frac = ((unsigned int)(x << zeros) & 0x7FFFFFFF) >> 21;
return (short) (((31 - zeros) << 10) + frac);
}
/* compute correlation from power spectrum */
static void WebRtcIsac_FindCorrelation(WebRtc_Word32 *PSpecQ12, WebRtc_Word32 *CorrQ7)
{
WebRtc_Word32 summ[FRAMESAMPLES/8];
WebRtc_Word32 diff[FRAMESAMPLES/8];
const WebRtc_Word16 *CS_ptrQ9;
WebRtc_Word32 sum;
int k, n;
for (k = 0; k < FRAMESAMPLES/8; k++) {
summ[k] = (PSpecQ12[k] + PSpecQ12[FRAMESAMPLES_QUARTER-1 - k] + 16) >> 5;
diff[k] = (PSpecQ12[k] - PSpecQ12[FRAMESAMPLES_QUARTER-1 - k] + 16) >> 5;
}
sum = 2;
for (n = 0; n < FRAMESAMPLES/8; n++)
sum += summ[n];
CorrQ7[0] = sum;
for (k = 0; k < AR_ORDER; k += 2) {
sum = 0;
CS_ptrQ9 = WebRtcIsac_kCos[k];
for (n = 0; n < FRAMESAMPLES/8; n++)
sum += (CS_ptrQ9[n] * diff[n] + 256) >> 9;
CorrQ7[k+1] = sum;
}
for (k=1; k<AR_ORDER; k+=2) {
sum = 0;
CS_ptrQ9 = WebRtcIsac_kCos[k];
for (n = 0; n < FRAMESAMPLES/8; n++)
sum += (CS_ptrQ9[n] * summ[n] + 256) >> 9;
CorrQ7[k+1] = sum;
}
}
/* compute inverse AR power spectrum */
/* Changed to the function used in iSAC FIX for compatibility reasons */
static void WebRtcIsac_FindInvArSpec(const WebRtc_Word16 *ARCoefQ12,
const WebRtc_Word32 gainQ10,
WebRtc_Word32 *CurveQ16)
{
WebRtc_Word32 CorrQ11[AR_ORDER+1];
WebRtc_Word32 sum, tmpGain;
WebRtc_Word32 diffQ16[FRAMESAMPLES/8];
const WebRtc_Word16 *CS_ptrQ9;
int k, n;
WebRtc_Word16 round, shftVal = 0, sh;
sum = 0;
for (n = 0; n < AR_ORDER+1; n++)
sum += WEBRTC_SPL_MUL(ARCoefQ12[n], ARCoefQ12[n]); /* Q24 */
sum = WEBRTC_SPL_RSHIFT_W32(WEBRTC_SPL_MUL(WEBRTC_SPL_RSHIFT_W32(sum, 6), 65) + 32768, 16); /* result in Q8 */
CorrQ11[0] = WEBRTC_SPL_RSHIFT_W32(WEBRTC_SPL_MUL(sum, gainQ10) + 256, 9);
/* To avoid overflow, we shift down gainQ10 if it is large. We will not lose any precision */
if(gainQ10>400000){
tmpGain = WEBRTC_SPL_RSHIFT_W32(gainQ10, 3);
round = 32;
shftVal = 6;
} else {
tmpGain = gainQ10;
round = 256;
shftVal = 9;
}
for (k = 1; k < AR_ORDER+1; k++) {
sum = 16384;
for (n = k; n < AR_ORDER+1; n++)
sum += WEBRTC_SPL_MUL(ARCoefQ12[n-k], ARCoefQ12[n]); /* Q24 */
sum = WEBRTC_SPL_RSHIFT_W32(sum, 15);
CorrQ11[k] = WEBRTC_SPL_RSHIFT_W32(WEBRTC_SPL_MUL(sum, tmpGain) + round, shftVal);
}
sum = WEBRTC_SPL_LSHIFT_W32(CorrQ11[0], 7);
for (n = 0; n < FRAMESAMPLES/8; n++)
CurveQ16[n] = sum;
for (k = 1; k < AR_ORDER; k += 2) {
//CS_ptrQ9 = WebRtcIsac_kCos[k];
for (n = 0; n < FRAMESAMPLES/8; n++)
CurveQ16[n] += WEBRTC_SPL_RSHIFT_W32(
WEBRTC_SPL_MUL(WebRtcIsac_kCos[k][n], CorrQ11[k+1]) + 2, 2);
}
CS_ptrQ9 = WebRtcIsac_kCos[0];
/* If CorrQ11[1] too large we avoid getting overflow in the calculation by shifting */
sh=WebRtcSpl_NormW32(CorrQ11[1]);
if (CorrQ11[1]==0) /* Use next correlation */
sh=WebRtcSpl_NormW32(CorrQ11[2]);
if (sh<9)
shftVal = 9 - sh;
else
shftVal = 0;
for (n = 0; n < FRAMESAMPLES/8; n++)
diffQ16[n] = WEBRTC_SPL_RSHIFT_W32(WEBRTC_SPL_MUL(CS_ptrQ9[n], WEBRTC_SPL_RSHIFT_W32(CorrQ11[1], shftVal)) + 2, 2);
for (k = 2; k < AR_ORDER; k += 2) {
CS_ptrQ9 = WebRtcIsac_kCos[k];
for (n = 0; n < FRAMESAMPLES/8; n++)
diffQ16[n] += WEBRTC_SPL_RSHIFT_W32(WEBRTC_SPL_MUL(CS_ptrQ9[n], WEBRTC_SPL_RSHIFT_W32(CorrQ11[k+1], shftVal)) + 2, 2);
}
for (k=0; k<FRAMESAMPLES/8; k++) {
CurveQ16[FRAMESAMPLES_QUARTER-1 - k] = CurveQ16[k] - WEBRTC_SPL_LSHIFT_W32(diffQ16[k], shftVal);
CurveQ16[k] += WEBRTC_SPL_LSHIFT_W32(diffQ16[k], shftVal);
}
}
/* generate array of dither samples in Q7 */
static void GenerateDitherQ7Lb(WebRtc_Word16 *bufQ7,
WebRtc_UWord32 seed,
int length,
WebRtc_Word16 AvgPitchGain_Q12)
{
int k, shft;
WebRtc_Word16 dither1_Q7, dither2_Q7, dither_gain_Q14;
if (AvgPitchGain_Q12 < 614) /* this threshold should be equal to that in decode_spec() */
{
for (k = 0; k < length-2; k += 3)
{
/* new random unsigned int */
seed = (seed * 196314165) + 907633515;
/* fixed-point dither sample between -64 and 64 (Q7) */
dither1_Q7 = (WebRtc_Word16)(((int)seed + 16777216)>>25); // * 128/4294967295
/* new random unsigned int */
seed = (seed * 196314165) + 907633515;
/* fixed-point dither sample between -64 and 64 */
dither2_Q7 = (WebRtc_Word16)(((int)seed + 16777216)>>25);
shft = (seed >> 25) & 15;
if (shft < 5)
{
bufQ7[k] = dither1_Q7;
bufQ7[k+1] = dither2_Q7;
bufQ7[k+2] = 0;
}
else if (shft < 10)
{
bufQ7[k] = dither1_Q7;
bufQ7[k+1] = 0;
bufQ7[k+2] = dither2_Q7;
}
else
{
bufQ7[k] = 0;
bufQ7[k+1] = dither1_Q7;
bufQ7[k+2] = dither2_Q7;
}
}
}
else
{
dither_gain_Q14 = (WebRtc_Word16)(22528 - 10 * AvgPitchGain_Q12);
/* dither on half of the coefficients */
for (k = 0; k < length-1; k += 2)
{
/* new random unsigned int */
seed = (seed * 196314165) + 907633515;
/* fixed-point dither sample between -64 and 64 */
dither1_Q7 = (WebRtc_Word16)(((int)seed + 16777216)>>25);
/* dither sample is placed in either even or odd index */
shft = (seed >> 25) & 1; /* either 0 or 1 */
bufQ7[k + shft] = (((dither_gain_Q14 * dither1_Q7) + 8192)>>14);
bufQ7[k + 1 - shft] = 0;
}
}
}
/******************************************************************************
* GenerateDitherQ7LbUB()
*
* generate array of dither samples in Q7 There are less zeros in dither
* vector compared to GenerateDitherQ7Lb.
*
* A uniform random number generator with the range of [-64 64] is employed
* but the generated dithers are scaled by 0.35, a heuristic scaling.
*
* Input:
* -seed : the initial seed for the random number generator.
* -length : the number of dither values to be generated.
*
* Output:
* -bufQ7 : pointer to a buffer where dithers are written to.
*/
static void GenerateDitherQ7LbUB(
WebRtc_Word16 *bufQ7,
WebRtc_UWord32 seed,
int length)
{
int k;
for (k = 0; k < length; k++) {
/* new random unsigned int */
seed = (seed * 196314165) + 907633515;
/* fixed-point dither sample between -64 and 64 (Q7) */
// * 128/4294967295
bufQ7[k] = (WebRtc_Word16)(((int)seed + 16777216)>>25);
// scale by 0.35
bufQ7[k] = (WebRtc_Word16)WEBRTC_SPL_MUL_16_16_RSFT(bufQ7[k],
2048, 13);
}
}
/*
* function to decode the complex spectrum from the bit stream
* returns the total number of bytes in the stream
*/
int WebRtcIsac_DecodeSpecLb(Bitstr *streamdata,
double *fr,
double *fi,
WebRtc_Word16 AvgPitchGain_Q12)
{
WebRtc_Word16 DitherQ7[FRAMESAMPLES];
WebRtc_Word16 data[FRAMESAMPLES];
WebRtc_Word32 invARSpec2_Q16[FRAMESAMPLES_QUARTER];
WebRtc_UWord16 invARSpecQ8[FRAMESAMPLES_QUARTER];
WebRtc_Word16 ARCoefQ12[AR_ORDER+1];
WebRtc_Word16 RCQ15[AR_ORDER];
WebRtc_Word16 gainQ10;
WebRtc_Word32 gain2_Q10, res;
WebRtc_Word32 in_sqrt;
WebRtc_Word32 newRes;
int k, len, i;
/* create dither signal */
GenerateDitherQ7Lb(DitherQ7, streamdata->W_upper, FRAMESAMPLES, AvgPitchGain_Q12);
/* decode model parameters */
if (WebRtcIsac_DecodeRc(streamdata, RCQ15) < 0)
return -ISAC_RANGE_ERROR_DECODE_SPECTRUM;
WebRtcSpl_ReflCoefToLpc(RCQ15, AR_ORDER, ARCoefQ12);
if (WebRtcIsac_DecodeGain2(streamdata, &gain2_Q10) < 0)
return -ISAC_RANGE_ERROR_DECODE_SPECTRUM;
/* compute inverse AR power spectrum */
WebRtcIsac_FindInvArSpec(ARCoefQ12, gain2_Q10, invARSpec2_Q16);
/* convert to magnitude spectrum, by doing square-roots (modified from SPLIB) */
res = 1 << (WebRtcSpl_GetSizeInBits(invARSpec2_Q16[0]) >> 1);
for (k = 0; k < FRAMESAMPLES_QUARTER; k++)
{
in_sqrt = invARSpec2_Q16[k];
i = 10;
/* Negative values make no sense for a real sqrt-function. */
if (in_sqrt<0)
in_sqrt=-in_sqrt;
newRes = (in_sqrt / res + res) >> 1;
do
{
res = newRes;
newRes = (in_sqrt / res + res) >> 1;
} while (newRes != res && i-- > 0);
invARSpecQ8[k] = (WebRtc_Word16)newRes;
}
/* arithmetic decoding of spectrum */
if ((len = WebRtcIsac_DecLogisticMulti2(data, streamdata, invARSpecQ8, DitherQ7,
FRAMESAMPLES, !IS_SWB_12KHZ)) <1)
return -ISAC_RANGE_ERROR_DECODE_SPECTRUM;
/* subtract dither and scale down spectral samples with low SNR */
if (AvgPitchGain_Q12 <= 614)
{
for (k = 0; k < FRAMESAMPLES; k += 4)
{
gainQ10 = WebRtcSpl_DivW32W16ResW16(30 << 10,
(WebRtc_Word16)((invARSpec2_Q16[k>>2] + (32768 + (33 << 16))) >> 16));
*fr++ = (double)((data[ k ] * gainQ10 + 512) >> 10) / 128.0;
*fi++ = (double)((data[k+1] * gainQ10 + 512) >> 10) / 128.0;
*fr++ = (double)((data[k+2] * gainQ10 + 512) >> 10) / 128.0;
*fi++ = (double)((data[k+3] * gainQ10 + 512) >> 10) / 128.0;
}
}
else
{
for (k = 0; k < FRAMESAMPLES; k += 4)
{
gainQ10 = WebRtcSpl_DivW32W16ResW16(36 << 10,
(WebRtc_Word16)((invARSpec2_Q16[k>>2] + (32768 + (40 << 16))) >> 16));
*fr++ = (double)((data[ k ] * gainQ10 + 512) >> 10) / 128.0;
*fi++ = (double)((data[k+1] * gainQ10 + 512) >> 10) / 128.0;
*fr++ = (double)((data[k+2] * gainQ10 + 512) >> 10) / 128.0;
*fi++ = (double)((data[k+3] * gainQ10 + 512) >> 10) / 128.0;
}
}
return len;
}
/******************************************************************************
* WebRtcIsac_DecodeSpecUB16()
* Decode real and imaginary part of the DFT coefficients, given a bit-stream.
* This function is called when the codec is in 0-16 kHz bandwidth.
* The decoded DFT coefficient can be transformed to time domain by
* WebRtcIsac_Time2Spec().
*
* Input:
* - streamdata : pointer to a stucture containg the encoded
* data and theparameters needed for entropy
* coding.
*
* Output:
* -*fr : pointer to a buffer where the real part of DFT
* coefficients are written to.
* -*fi : pointer to a buffer where the imaginary part
* of DFT coefficients are written to.
*
* Return value : < 0 if an error occures
* 0 if succeeded.
*/
int WebRtcIsac_DecodeSpecUB16(
Bitstr* streamdata,
double* fr,
double* fi)
{
WebRtc_Word16 DitherQ7[FRAMESAMPLES];
WebRtc_Word16 data[FRAMESAMPLES];
WebRtc_Word32 invARSpec2_Q16[FRAMESAMPLES_QUARTER];
WebRtc_UWord16 invARSpecQ8[FRAMESAMPLES_QUARTER];
WebRtc_Word16 ARCoefQ12[AR_ORDER+1];
WebRtc_Word16 RCQ15[AR_ORDER];
WebRtc_Word32 gain2_Q10, res;
WebRtc_Word32 in_sqrt;
WebRtc_Word32 newRes;
int k, len, i, j;
/* create dither signal */
GenerateDitherQ7LbUB(DitherQ7, streamdata->W_upper, FRAMESAMPLES);
/* decode model parameters */
if (WebRtcIsac_DecodeRc(streamdata, RCQ15) < 0)
return -ISAC_RANGE_ERROR_DECODE_SPECTRUM;
WebRtcSpl_ReflCoefToLpc(RCQ15, AR_ORDER, ARCoefQ12);
if (WebRtcIsac_DecodeGain2(streamdata, &gain2_Q10) < 0)
return -ISAC_RANGE_ERROR_DECODE_SPECTRUM;
/* compute inverse AR power spectrum */
WebRtcIsac_FindInvArSpec(ARCoefQ12, gain2_Q10, invARSpec2_Q16);
/* convert to magnitude spectrum, by doing square-roots (modified from SPLIB) */
res = 1 << (WebRtcSpl_GetSizeInBits(invARSpec2_Q16[0]) >> 1);
for (k = 0; k < FRAMESAMPLES_QUARTER; k++)
{
in_sqrt = invARSpec2_Q16[k];
i = 10;
/* Negative values make no sense for a real sqrt-function. */
if (in_sqrt<0)
in_sqrt=-in_sqrt;
newRes = (in_sqrt / res + res) >> 1;
do
{
res = newRes;
newRes = (in_sqrt / res + res) >> 1;
} while (newRes != res && i-- > 0);
invARSpecQ8[k] = (WebRtc_Word16)newRes;
}
/* arithmetic decoding of spectrum */
if ((len = WebRtcIsac_DecLogisticMulti2(data, streamdata, invARSpecQ8,
DitherQ7, FRAMESAMPLES, !IS_SWB_12KHZ)) <1)
return -ISAC_RANGE_ERROR_DECODE_SPECTRUM;
/* re-arrange DFT coefficients and scale down */
for (j = 0, k = 0; k < FRAMESAMPLES; k += 4, j++)
{
fr[j] = (double)data[ k ] / 128.0;
fi[j] = (double)data[k+1] / 128.0;
fr[(FRAMESAMPLES_HALF) - 1 - j] = (double)data[k+2] / 128.0;
fi[(FRAMESAMPLES_HALF) - 1 - j] = (double)data[k+3] / 128.0;
}
return len;
}
/******************************************************************************
* WebRtcIsac_DecodeSpecUB12()
* Decode real and imaginary part of the DFT coefficients, given a bit-stream.
* This function is called when the codec is in 0-12 kHz bandwidth.
* The decoded DFT coefficient can be transformed to time domain by
* WebRtcIsac_Time2Spec().
*
* Input:
* - streamdata : pointer to a stucture containg the encoded
* data and theparameters needed for entropy
* coding.
*
* Output:
* -*fr : pointer to a buffer where the real part of DFT
* coefficients are written to.
* -*fi : pointer to a buffer where the imaginary part
* of DFT coefficients are written to.
*
* Return value : < 0 if an error occures
* 0 if succeeded.
*/
int WebRtcIsac_DecodeSpecUB12(
Bitstr *streamdata,
double *fr,
double *fi)
{
WebRtc_Word16 DitherQ7[FRAMESAMPLES];
WebRtc_Word16 data[FRAMESAMPLES];
WebRtc_Word32 invARSpec2_Q16[FRAMESAMPLES_QUARTER];
WebRtc_UWord16 invARSpecQ8[FRAMESAMPLES_QUARTER];
WebRtc_Word16 ARCoefQ12[AR_ORDER+1];
WebRtc_Word16 RCQ15[AR_ORDER];
WebRtc_Word32 gain2_Q10;
WebRtc_Word32 res;
WebRtc_Word32 in_sqrt;
WebRtc_Word32 newRes;
int k, len, i;
/* create dither signal */
GenerateDitherQ7LbUB(DitherQ7, streamdata->W_upper, FRAMESAMPLES);
/* decode model parameters */
if (WebRtcIsac_DecodeRc(streamdata, RCQ15) < 0)
return -ISAC_RANGE_ERROR_DECODE_SPECTRUM;
WebRtcSpl_ReflCoefToLpc(RCQ15, AR_ORDER, ARCoefQ12);
if (WebRtcIsac_DecodeGain2(streamdata, &gain2_Q10) < 0)
return -ISAC_RANGE_ERROR_DECODE_SPECTRUM;
/* compute inverse AR power spectrum */
WebRtcIsac_FindInvArSpec(ARCoefQ12, gain2_Q10, invARSpec2_Q16);
/* convert to magnitude spectrum, by doing square-roots (modified from SPLIB) */
res = 1 << (WebRtcSpl_GetSizeInBits(invARSpec2_Q16[0]) >> 1);
for (k = 0; k < FRAMESAMPLES_QUARTER; k++)
{
in_sqrt = invARSpec2_Q16[k];
i = 10;
/* Negative values make no sense for a real sqrt-function. */
if (in_sqrt<0)
in_sqrt=-in_sqrt;
newRes = (in_sqrt / res + res) >> 1;
do
{
res = newRes;
newRes = (in_sqrt / res + res) >> 1;
} while (newRes != res && i-- > 0);
invARSpecQ8[k] = (WebRtc_Word16)newRes;
}
/* arithmetic decoding of spectrum */
if ((len = WebRtcIsac_DecLogisticMulti2(data, streamdata,
invARSpecQ8, DitherQ7, (FRAMESAMPLES_HALF), IS_SWB_12KHZ)) < 1)
{
return -ISAC_RANGE_ERROR_DECODE_SPECTRUM;
}
for (k = 0, i = 0; k < FRAMESAMPLES_HALF; k += 4)
{
fr[i] = (double)data[ k ] / 128.0;
fi[i] = (double)data[k+1] / 128.0;
i++;
fr[i] = (double)data[k+2] / 128.0;
fi[i] = (double)data[k+3] / 128.0;
i++;
}
// The second half of real and imaginary coefficients is zero. This is
// due to using the old FFT module which requires two signals as input
// while in 0-12 kHz mode we only have 8-12 kHz band, and the second signal
// is set to zero
memset(&fr[FRAMESAMPLES_QUARTER], 0, FRAMESAMPLES_QUARTER * sizeof(double));
memset(&fi[FRAMESAMPLES_QUARTER], 0, FRAMESAMPLES_QUARTER * sizeof(double));
return len;
}
int WebRtcIsac_EncodeSpecLb(const WebRtc_Word16 *fr,
const WebRtc_Word16 *fi,
Bitstr *streamdata,
WebRtc_Word16 AvgPitchGain_Q12)
{
WebRtc_Word16 ditherQ7[FRAMESAMPLES];
WebRtc_Word16 dataQ7[FRAMESAMPLES];
WebRtc_Word32 PSpec[FRAMESAMPLES_QUARTER];
WebRtc_Word32 invARSpec2_Q16[FRAMESAMPLES_QUARTER];
WebRtc_UWord16 invARSpecQ8[FRAMESAMPLES_QUARTER];
WebRtc_Word32 CorrQ7[AR_ORDER+1];
WebRtc_Word32 CorrQ7_norm[AR_ORDER+1];
WebRtc_Word16 RCQ15[AR_ORDER];
WebRtc_Word16 ARCoefQ12[AR_ORDER+1];
WebRtc_Word32 gain2_Q10;
WebRtc_Word16 val;
WebRtc_Word32 nrg, res;
WebRtc_UWord32 sum;
WebRtc_Word32 in_sqrt;
WebRtc_Word32 newRes;
WebRtc_Word16 err;
WebRtc_UWord32 nrg_u32;
int shift_var;
int k, n, j, i;
/* create dither_float signal */
GenerateDitherQ7Lb(ditherQ7, streamdata->W_upper, FRAMESAMPLES, AvgPitchGain_Q12);
/* add dither and quantize, and compute power spectrum */
for (k = 0; k < FRAMESAMPLES; k += 4)
{
val = ((*fr++ + ditherQ7[k] + 64) & 0xFF80) - ditherQ7[k];
dataQ7[k] = val;
sum = val * val;
val = ((*fi++ + ditherQ7[k+1] + 64) & 0xFF80) - ditherQ7[k+1];
dataQ7[k+1] = val;
sum += val * val;
val = ((*fr++ + ditherQ7[k+2] + 64) & 0xFF80) - ditherQ7[k+2];
dataQ7[k+2] = val;
sum += val * val;
val = ((*fi++ + ditherQ7[k+3] + 64) & 0xFF80) - ditherQ7[k+3];
dataQ7[k+3] = val;
sum += val * val;
PSpec[k>>2] = sum >> 2;
}
/* compute correlation from power spectrum */
WebRtcIsac_FindCorrelation(PSpec, CorrQ7);
/* find AR coefficients */
/* number of bit shifts to 14-bit normalize CorrQ7[0] (leaving room for sign) */
shift_var = WebRtcSpl_NormW32(CorrQ7[0]) - 18;
if (shift_var > 0) {
for (k=0; k<AR_ORDER+1; k++) {
CorrQ7_norm[k] = CorrQ7[k] << shift_var;
}
} else {
for (k=0; k<AR_ORDER+1; k++) {
CorrQ7_norm[k] = CorrQ7[k] >> (-shift_var);
}
}
/* find RC coefficients */
WebRtcSpl_AutoCorrToReflCoef(CorrQ7_norm, AR_ORDER, RCQ15);
/* quantize & code RC Coefficient */
WebRtcIsac_EncodeRc(RCQ15, streamdata);
/* RC -> AR coefficients */
WebRtcSpl_ReflCoefToLpc(RCQ15, AR_ORDER, ARCoefQ12);
/* compute ARCoef' * Corr * ARCoef in Q19 */
nrg = 0;
for (j = 0; j <= AR_ORDER; j++) {
for (n = 0; n <= j; n++) {
nrg += ( ARCoefQ12[j] * ((CorrQ7_norm[j-n] * ARCoefQ12[n] + 256) >> 9) + 4 ) >> 3;
}
for (n = j+1; n <= AR_ORDER; n++) {
nrg += ( ARCoefQ12[j] * ((CorrQ7_norm[n-j] * ARCoefQ12[n] + 256) >> 9) + 4 ) >> 3;
}
}
nrg_u32 = (WebRtc_UWord32)nrg;
if (shift_var > 0) {
nrg_u32 = nrg_u32 >> shift_var;
} else {
nrg_u32 = nrg_u32 << (-shift_var);
}
if (nrg_u32 > 0x7FFFFFFF)
nrg = 0x7FFFFFFF;
else
nrg = (WebRtc_Word32)nrg_u32;
gain2_Q10 = WebRtcSpl_DivResultInQ31(FRAMESAMPLES_QUARTER, nrg); /* also shifts 31 bits to the left! */
/* quantize & code gain2_Q10 */
if (WebRtcIsac_EncodeGain2(&gain2_Q10, streamdata)) {
return -1;
}
/* compute inverse AR power spectrum */
WebRtcIsac_FindInvArSpec(ARCoefQ12, gain2_Q10, invARSpec2_Q16);
/* convert to magnitude spectrum, by doing square-roots (modified from SPLIB) */
res = 1 << (WebRtcSpl_GetSizeInBits(invARSpec2_Q16[0]) >> 1);
for (k = 0; k < FRAMESAMPLES_QUARTER; k++)
{
in_sqrt = invARSpec2_Q16[k];
i = 10;
/* Negative values make no sense for a real sqrt-function. */
if (in_sqrt<0)
in_sqrt=-in_sqrt;
newRes = (in_sqrt / res + res) >> 1;
do
{
res = newRes;
newRes = (in_sqrt / res + res) >> 1;
} while (newRes != res && i-- > 0);
invARSpecQ8[k] = (WebRtc_Word16)newRes;
}
/* arithmetic coding of spectrum */
err = WebRtcIsac_EncLogisticMulti2(streamdata, dataQ7, invARSpecQ8,
FRAMESAMPLES, !IS_SWB_12KHZ);
if (err < 0)
{
return (err);
}
return 0;
}
/******************************************************************************
* WebRtcIsac_EncodeSpecUB16()
* Quantize and encode real and imaginary part of the DFT coefficients.
* This function is called when the codec is in 0-16 kHz bandwidth.
* The real and imaginary part are computed by calling WebRtcIsac_Time2Spec().
*
*
* Input:
* -*fr : pointer to a buffer where the real part of DFT
* coefficients are stored.
* -*fi : pointer to a buffer where the imaginary part
* of DFT coefficients are stored.
*
* Output:
* - streamdata : pointer to a stucture containg the encoded
* data and theparameters needed for entropy
* coding.
*
* Return value : < 0 if an error occures
* 0 if succeeded.
*/
int WebRtcIsac_EncodeSpecUB16(
const WebRtc_Word16* fr,
const WebRtc_Word16* fi,
Bitstr* streamdata)
{
WebRtc_Word16 ditherQ7[FRAMESAMPLES];
WebRtc_Word16 dataQ7[FRAMESAMPLES];
WebRtc_Word32 PSpec[FRAMESAMPLES_QUARTER];
WebRtc_Word32 invARSpec2_Q16[FRAMESAMPLES_QUARTER];
WebRtc_UWord16 invARSpecQ8[FRAMESAMPLES_QUARTER];
WebRtc_Word32 CorrQ7[AR_ORDER+1];
WebRtc_Word32 CorrQ7_norm[AR_ORDER+1];
WebRtc_Word16 RCQ15[AR_ORDER];
WebRtc_Word16 ARCoefQ12[AR_ORDER+1];
WebRtc_Word32 gain2_Q10;
WebRtc_Word16 val;
WebRtc_Word32 nrg, res;
WebRtc_UWord32 sum;
WebRtc_Word32 in_sqrt;
WebRtc_Word32 newRes;
WebRtc_Word16 err;
WebRtc_UWord32 nrg_u32;
int shift_var;
int k, n, j, i;
/* create dither_float signal */
GenerateDitherQ7LbUB(ditherQ7, streamdata->W_upper, FRAMESAMPLES);
/* add dither and quantize, and compute power spectrum */
for (j = 0, k = 0; k < FRAMESAMPLES; k += 4, j++)
{
val = ((fr[j] + ditherQ7[k] + 64) & 0xFF80) - ditherQ7[k];
dataQ7[k] = val;
sum = val * val;
val = ((fi[j] + ditherQ7[k+1] + 64) & 0xFF80) - ditherQ7[k+1];
dataQ7[k+1] = val;
sum += val * val;
val = ((fr[(FRAMESAMPLES_HALF) - 1 - j] + ditherQ7[k+2] + 64) &
0xFF80) - ditherQ7[k+2];
dataQ7[k+2] = val;
sum += val * val;
val = ((fi[(FRAMESAMPLES_HALF) - 1 - j] + ditherQ7[k+3] + 64) &
0xFF80) - ditherQ7[k+3];
dataQ7[k+3] = val;
sum += val * val;
PSpec[k>>2] = sum >> 2;
}
/* compute correlation from power spectrum */
WebRtcIsac_FindCorrelation(PSpec, CorrQ7);
/* find AR coefficients
number of bit shifts to 14-bit normalize CorrQ7[0]
(leaving room for sign) */
shift_var = WebRtcSpl_NormW32(CorrQ7[0]) - 18;
if (shift_var > 0) {
for (k=0; k<AR_ORDER+1; k++) {
CorrQ7_norm[k] = CorrQ7[k] << shift_var;
}
} else {
for (k=0; k<AR_ORDER+1; k++) {
CorrQ7_norm[k] = CorrQ7[k] >> (-shift_var);
}
}
/* find RC coefficients */
WebRtcSpl_AutoCorrToReflCoef(CorrQ7_norm, AR_ORDER, RCQ15);
/* quantize & code RC Coef */
WebRtcIsac_EncodeRc(RCQ15, streamdata);
/* RC -> AR coefficients */
WebRtcSpl_ReflCoefToLpc(RCQ15, AR_ORDER, ARCoefQ12);
/* compute ARCoef' * Corr * ARCoef in Q19 */
nrg = 0;
for (j = 0; j <= AR_ORDER; j++) {
for (n = 0; n <= j; n++) {
nrg += ( ARCoefQ12[j] * ((CorrQ7_norm[j-n] * ARCoefQ12[n] +
256) >> 9) + 4 ) >> 3;
}
for (n = j+1; n <= AR_ORDER; n++) {
nrg += ( ARCoefQ12[j] * ((CorrQ7_norm[n-j] * ARCoefQ12[n] +
256) >> 9) + 4 ) >> 3;
}
}
nrg_u32 = (WebRtc_UWord32)nrg;
if (shift_var > 0) {
nrg_u32 = nrg_u32 >> shift_var;
} else {
nrg_u32 = nrg_u32 << (-shift_var);
}
if (nrg_u32 > 0x7FFFFFFF)
nrg = 0x7FFFFFFF;
else
nrg = (WebRtc_Word32)nrg_u32;
gain2_Q10 = WebRtcSpl_DivResultInQ31(FRAMESAMPLES_QUARTER, nrg); /* also shifts 31 bits to the left! */
/* quantize & code gain2_Q10 */
if (WebRtcIsac_EncodeGain2(&gain2_Q10, streamdata)) {
return -1;
}
/* compute inverse AR power spectrum */
WebRtcIsac_FindInvArSpec(ARCoefQ12, gain2_Q10, invARSpec2_Q16);
/* convert to magnitude spectrum, by doing square-roots (modified from SPLIB) */
res = 1 << (WebRtcSpl_GetSizeInBits(invARSpec2_Q16[0]) >> 1);
for (k = 0; k < FRAMESAMPLES_QUARTER; k++)
{
in_sqrt = invARSpec2_Q16[k];
i = 10;
/* Negative values make no sense for a real sqrt-function. */
if (in_sqrt<0)
in_sqrt=-in_sqrt;
newRes = (in_sqrt / res + res) >> 1;
do
{
res = newRes;
newRes = (in_sqrt / res + res) >> 1;
} while (newRes != res && i-- > 0);
invARSpecQ8[k] = (WebRtc_Word16)newRes;
}
/* arithmetic coding of spectrum */
err = WebRtcIsac_EncLogisticMulti2(streamdata, dataQ7, invARSpecQ8,
FRAMESAMPLES, !IS_SWB_12KHZ);
if (err < 0)
{
return (err);
}
return 0;
}
int WebRtcIsac_EncodeSpecUB12(const WebRtc_Word16 *fr,
const WebRtc_Word16 *fi,
Bitstr *streamdata)
{
WebRtc_Word16 ditherQ7[FRAMESAMPLES];
WebRtc_Word16 dataQ7[FRAMESAMPLES];
WebRtc_Word32 PSpec[FRAMESAMPLES_QUARTER];
WebRtc_Word32 invARSpec2_Q16[FRAMESAMPLES_QUARTER];
WebRtc_UWord16 invARSpecQ8[FRAMESAMPLES_QUARTER];
WebRtc_Word32 CorrQ7[AR_ORDER+1];
WebRtc_Word32 CorrQ7_norm[AR_ORDER+1];
WebRtc_Word16 RCQ15[AR_ORDER];
WebRtc_Word16 ARCoefQ12[AR_ORDER+1];
WebRtc_Word32 gain2_Q10;
WebRtc_Word16 val;
WebRtc_Word32 nrg, res;
WebRtc_UWord32 sum;
WebRtc_Word32 in_sqrt;
WebRtc_Word32 newRes;
WebRtc_Word16 err;
int shift_var;
int k, n, j, i;
WebRtc_UWord32 nrg_u32;
/* create dither_float signal */
GenerateDitherQ7LbUB(ditherQ7, streamdata->W_upper, FRAMESAMPLES);
/* add dither and quantize, and compute power spectrum */
for (k = 0, j = 0; k < (FRAMESAMPLES_HALF); k += 4)
{
val = ((*fr++ + ditherQ7[k] + 64) & 0xFF80) - ditherQ7[k];
dataQ7[k] = val;
sum = (val) * (val);
val = ((*fi++ + ditherQ7[k+1] + 64) & 0xFF80) - ditherQ7[k+1];
dataQ7[k+1] = val;
sum += (val) * (val);
if(j < FRAMESAMPLES_QUARTER)
{
PSpec[j] = sum >> 1;
j++;
}
val = ((*fr++ + ditherQ7[k+2] + 64) & 0xFF80) - ditherQ7[k+2];
dataQ7[k+2] = val;
sum = (val) * (val);
val = ((*fi++ + ditherQ7[k+3] + 64) & 0xFF80) - ditherQ7[k+3];
dataQ7[k+3] = val;
sum += (val) * (val);
if(j < FRAMESAMPLES_QUARTER)
{
PSpec[j] = sum >> 1;
j++;
}
}
/* compute correlation from power spectrum */
WebRtcIsac_FindCorrelation(PSpec, CorrQ7);
/* find AR coefficients */
/* number of bit shifts to 14-bit normalize CorrQ7[0] (leaving room for sign) */
shift_var = WebRtcSpl_NormW32(CorrQ7[0]) - 18;
if (shift_var > 0) {
for (k=0; k<AR_ORDER+1; k++) {
CorrQ7_norm[k] = CorrQ7[k] << shift_var;
}
} else {
for (k=0; k<AR_ORDER+1; k++) {
CorrQ7_norm[k] = CorrQ7[k] >> (-shift_var);
}
}
/* find RC coefficients */
WebRtcSpl_AutoCorrToReflCoef(CorrQ7_norm, AR_ORDER, RCQ15);
/* quantize & code RC Coef */
WebRtcIsac_EncodeRc(RCQ15, streamdata);
/* RC -> AR coefficients */
WebRtcSpl_ReflCoefToLpc(RCQ15, AR_ORDER, ARCoefQ12);
/* compute ARCoef' * Corr * ARCoef in Q19 */
nrg = 0;
for (j = 0; j <= AR_ORDER; j++) {
for (n = 0; n <= j; n++) {
nrg += ( ARCoefQ12[j] * ((CorrQ7_norm[j-n] * ARCoefQ12[n] + 256) >> 9) + 4 ) >> 3;
}
for (n = j+1; n <= AR_ORDER; n++) {
nrg += ( ARCoefQ12[j] * ((CorrQ7_norm[n-j] * ARCoefQ12[n] + 256) >> 9) + 4 ) >> 3;
}
}
nrg_u32 = (WebRtc_UWord32)nrg;
if (shift_var > 0) {
nrg_u32 = nrg_u32 >> shift_var;
} else {
nrg_u32 = nrg_u32 << (-shift_var);
}
if (nrg_u32 > 0x7FFFFFFF) {
nrg = 0x7FFFFFFF;
} else {
nrg = (WebRtc_Word32)nrg_u32;
}
gain2_Q10 = WebRtcSpl_DivResultInQ31(FRAMESAMPLES_QUARTER, nrg); /* also shifts 31 bits to the left! */
/* quantize & code gain2_Q10 */
if (WebRtcIsac_EncodeGain2(&gain2_Q10, streamdata)) {
return -1;
}
/* compute inverse AR power spectrum */
WebRtcIsac_FindInvArSpec(ARCoefQ12, gain2_Q10, invARSpec2_Q16);
/* convert to magnitude spectrum, by doing square-roots (modified from SPLIB) */
res = 1 << (WebRtcSpl_GetSizeInBits(invARSpec2_Q16[0]) >> 1);
for (k = 0; k < FRAMESAMPLES_QUARTER; k++)
{
in_sqrt = invARSpec2_Q16[k];
i = 10;
/* Negative values make no sense for a real sqrt-function. */
if (in_sqrt<0)
in_sqrt=-in_sqrt;
newRes = (in_sqrt / res + res) >> 1;
do
{
res = newRes;
newRes = (in_sqrt / res + res) >> 1;
} while (newRes != res && i-- > 0);
invARSpecQ8[k] = (WebRtc_Word16)newRes;
}
/* arithmetic coding of spectrum */
err = WebRtcIsac_EncLogisticMulti2(streamdata, dataQ7, invARSpecQ8,
(FRAMESAMPLES_HALF), IS_SWB_12KHZ);
if (err < 0)
{
return (err);
}
return 0;
}
/* step-up */
void WebRtcIsac_Rc2Poly(double *RC, int N, double *a)
{
int m, k;
double tmp[MAX_AR_MODEL_ORDER];
a[0] = 1.0;
tmp[0] = 1.0;
for (m=1; m<=N; m++) {
/* copy */
for (k=1; k<m; k++)
tmp[k] = a[k];
a[m] = RC[m-1];
for (k=1; k<m; k++)
a[k] += RC[m-1] * tmp[m-k];
}
return;
}
/* step-down */
void WebRtcIsac_Poly2Rc(double *a, int N, double *RC)
{
int m, k;
double tmp[MAX_AR_MODEL_ORDER];
double tmp_inv;
RC[N-1] = a[N];
for (m=N-1; m>0; m--) {
tmp_inv = 1.0 / (1.0 - RC[m]*RC[m]);
for (k=1; k<=m; k++)
tmp[k] = (a[k] - RC[m] * a[m-k+1]) * tmp_inv;
for (k=1; k<m; k++)
a[k] = tmp[k];
RC[m-1] = tmp[m];
}
return;
}
#define MAX_ORDER 100
void WebRtcIsac_Rc2Lar(const double *refc, double *lar, int order) { /* Matlab's LAR definition */
int k;
for (k = 0; k < order; k++) {
lar[k] = log((1 + refc[k]) / (1 - refc[k]));
}
}
void WebRtcIsac_Lar2Rc(const double *lar, double *refc, int order) {
int k;
double tmp;
for (k = 0; k < order; k++) {
tmp = exp(lar[k]);
refc[k] = (tmp - 1) / (tmp + 1);
}
}
void WebRtcIsac_Poly2Lar(double *lowband, int orderLo, double *hiband, int orderHi, int Nsub, double *lars) {
int k, n, orderTot;
double poly[MAX_ORDER], lar[MAX_ORDER], rc[MAX_ORDER], *inpl, *inph, *outp;
orderTot = (orderLo + orderHi + 2);
inpl = lowband;
inph = hiband;
outp = lars;
poly[0] = 1.0;
for (k = 0; k < Nsub; k++) {
/* gains */
outp[0] = inpl[0];
outp[1] = inph[0];
/* Low band */
for (n = 1; n <= orderLo; n++)
poly[n] = inpl[n];
WebRtcIsac_Poly2Rc(poly, orderLo, rc);
WebRtcIsac_Rc2Lar(rc, lar, orderLo);
for (n = 0; n < orderLo; n++)
outp[n + 2] = lar[n];
/* High band */
for (n = 1; n <= orderHi; n++)
poly[n] = inph[n];
WebRtcIsac_Poly2Rc(poly, orderHi, rc);
WebRtcIsac_Rc2Lar(rc, lar, orderHi);
for (n = 0; n < orderHi; n++)
outp[n + orderLo + 2] = lar[n];
inpl += orderLo + 1;
inph += orderHi + 1;
outp += orderTot;
}
}
WebRtc_Word16
WebRtcIsac_Poly2LarUB(
double* lpcVecs,
WebRtc_Word16 bandwidth)
{
double poly[MAX_ORDER];
double rc[MAX_ORDER];
double* ptrIO;
WebRtc_Word16 vecCntr;
WebRtc_Word16 vecSize;
WebRtc_Word16 numVec;
vecSize = UB_LPC_ORDER;
switch(bandwidth)
{
case isac12kHz:
{
numVec = UB_LPC_VEC_PER_FRAME;
break;
}
case isac16kHz:
{
numVec = UB16_LPC_VEC_PER_FRAME;
break;
}
default:
return -1;
}
ptrIO = lpcVecs;
poly[0] = 1.0;
for(vecCntr = 0; vecCntr < numVec; vecCntr++)
{
memcpy(&poly[1], ptrIO, sizeof(double) * vecSize);
WebRtcIsac_Poly2Rc(poly, vecSize, rc);
WebRtcIsac_Rc2Lar(rc, ptrIO, vecSize);
ptrIO += vecSize;
}
return 0;
}
void WebRtcIsac_Lar2Poly(double *lars, double *lowband, int orderLo, double *hiband, int orderHi, int Nsub) {
int k, n, orderTot;
double poly[MAX_ORDER], lar[MAX_ORDER], rc[MAX_ORDER], *outpl, *outph, *inp;
orderTot = (orderLo + orderHi + 2);
outpl = lowband;
outph = hiband;
inp = lars;
for (k = 0; k < Nsub; k++) {
/* gains */
outpl[0] = inp[0];
outph[0] = inp[1];
/* Low band */
for (n = 0; n < orderLo; n++)
lar[n] = inp[n + 2];
WebRtcIsac_Lar2Rc(lar, rc, orderLo);
WebRtcIsac_Rc2Poly(rc, orderLo, poly);
for (n = 1; n <= orderLo; n++)
outpl[n] = poly[n];
/* High band */
for (n = 0; n < orderHi; n++)
lar[n] = inp[n + orderLo + 2];
WebRtcIsac_Lar2Rc(lar, rc, orderHi);
WebRtcIsac_Rc2Poly(rc, orderHi, poly);
for (n = 1; n <= orderHi; n++)
outph[n] = poly[n];
outpl += orderLo + 1;
outph += orderHi + 1;
inp += orderTot;
}
}
// assumes 2 LAR vectors interpolates to 'numPolyVec' A-polynomials
void
WebRtcIsac_Lar2PolyInterpolUB(
double* larVecs,
double* percepFilterParams,
int numPolyVecs) // includes the first and the last point of the interval
{
int polyCntr, coeffCntr;
double larInterpol[UB_LPC_ORDER];
double rc[UB_LPC_ORDER];
double delta[UB_LPC_ORDER];
// calculate the step-size for linear interpolation coefficients
for(coeffCntr = 0; coeffCntr < UB_LPC_ORDER; coeffCntr++)
{
delta[coeffCntr] = (larVecs[UB_LPC_ORDER + coeffCntr] -
larVecs[coeffCntr]) / (numPolyVecs - 1);
}
for(polyCntr = 0; polyCntr < numPolyVecs; polyCntr++)
{
for(coeffCntr = 0; coeffCntr < UB_LPC_ORDER; coeffCntr++)
{
larInterpol[coeffCntr] = larVecs[coeffCntr] +
delta[coeffCntr] * polyCntr;
}
WebRtcIsac_Lar2Rc(larInterpol, rc, UB_LPC_ORDER);
// convert to A-polynomial, the following function returns A[0] = 1;
// which is written where gains had to be written. Then we write the
// gain (outside this function). This way we say a memcpy
WebRtcIsac_Rc2Poly(rc, UB_LPC_ORDER, percepFilterParams);
percepFilterParams += (UB_LPC_ORDER + 1);
}
}
int WebRtcIsac_DecodeLpc(Bitstr *streamdata, double *LPCCoef_lo, double *LPCCoef_hi, int *outmodel) {
double lars[KLT_ORDER_GAIN + KLT_ORDER_SHAPE];
int err;
err = WebRtcIsac_DecodeLpcCoef(streamdata, lars, outmodel);
if (err<0) // error check
return -ISAC_RANGE_ERROR_DECODE_LPC;
WebRtcIsac_Lar2Poly(lars, LPCCoef_lo, ORDERLO, LPCCoef_hi, ORDERHI, SUBFRAMES);
return 0;
}
WebRtc_Word16
WebRtcIsac_DecodeInterpolLpcUb(
Bitstr* streamdata,
double* percepFilterParams,
WebRtc_Word16 bandwidth)
{
double lpcCoeff[UB_LPC_ORDER * UB16_LPC_VEC_PER_FRAME];
int err;
int interpolCntr;
int subframeCntr;
WebRtc_Word16 numSegments;
WebRtc_Word16 numVecPerSegment;
WebRtc_Word16 numGains;
double percepFilterGains[SUBFRAMES<<1];
double* ptrOutParam = percepFilterParams;
err = WebRtcIsac_DecodeLpcCoefUB(streamdata, lpcCoeff, percepFilterGains,
bandwidth);
// error check
if (err<0)
{
return -ISAC_RANGE_ERROR_DECODE_LPC;
}
switch(bandwidth)
{
case isac12kHz:
{
numGains = SUBFRAMES;
numSegments = UB_LPC_VEC_PER_FRAME - 1;
numVecPerSegment = kLpcVecPerSegmentUb12;
break;
}
case isac16kHz:
{
numGains = SUBFRAMES << 1;
numSegments = UB16_LPC_VEC_PER_FRAME - 1;
numVecPerSegment = kLpcVecPerSegmentUb16;
break;
}
default:
return -1;
}
for(interpolCntr = 0; interpolCntr < numSegments; interpolCntr++)
{
WebRtcIsac_Lar2PolyInterpolUB(
&lpcCoeff[interpolCntr * UB_LPC_ORDER], ptrOutParam,
numVecPerSegment + 1);
ptrOutParam += ((numVecPerSegment) *
(UB_LPC_ORDER + 1));
}
ptrOutParam = percepFilterParams;
if(bandwidth == isac16kHz)
{
ptrOutParam += (1 + UB_LPC_ORDER);
}
for(subframeCntr = 0; subframeCntr < numGains; subframeCntr++)
{
*ptrOutParam = percepFilterGains[subframeCntr];
ptrOutParam += (1 + UB_LPC_ORDER);
}
return 0;
}
/* decode & dequantize LPC Coef */
int WebRtcIsac_DecodeLpcCoef(Bitstr *streamdata, double *LPCCoef, int *outmodel)
{
int j, k, n, model, pos, pos2, posg, poss, offsg, offss, offs2;
int index_g[KLT_ORDER_GAIN], index_s[KLT_ORDER_SHAPE];
double tmpcoeffs_g[KLT_ORDER_GAIN],tmpcoeffs_s[KLT_ORDER_SHAPE];
double tmpcoeffs2_g[KLT_ORDER_GAIN], tmpcoeffs2_s[KLT_ORDER_SHAPE];
double sum;
int err;
/* entropy decoding of model number */
err = WebRtcIsac_DecHistOneStepMulti(&model, streamdata, WebRtcIsac_kQKltModelCdfPtr, WebRtcIsac_kQKltModelInitIndex, 1);
if (err<0) // error check
return err;
/* entropy decoding of quantization indices */
err = WebRtcIsac_DecHistOneStepMulti(index_s, streamdata, WebRtcIsac_kQKltCdfPtrShape[model], WebRtcIsac_kQKltInitIndexShape[model], KLT_ORDER_SHAPE);
if (err<0) // error check
return err;
err = WebRtcIsac_DecHistOneStepMulti(index_g, streamdata, WebRtcIsac_kQKltCdfPtrGain[model], WebRtcIsac_kQKltInitIndexGain[model], KLT_ORDER_GAIN);
if (err<0) // error check
return err;
/* find quantization levels for coefficients */
for (k=0; k<KLT_ORDER_SHAPE; k++) {
tmpcoeffs_s[WebRtcIsac_kQKltSelIndShape[k]] = WebRtcIsac_kQKltLevelsShape[WebRtcIsac_kQKltOfLevelsShape[model]+WebRtcIsac_kQKltOffsetShape[model][k] + index_s[k]];
}
for (k=0; k<KLT_ORDER_GAIN; k++) {
tmpcoeffs_g[WebRtcIsac_kQKltSelIndGain[k]] = WebRtcIsac_kQKltLevelsGain[WebRtcIsac_kQKltOfLevelsGain[model]+ WebRtcIsac_kQKltOffsetGain[model][k] + index_g[k]];
}
/* inverse KLT */
/* left transform */ // Transpose matrix!
offsg = 0;
offss = 0;
posg = 0;
poss = 0;
for (j=0; j<SUBFRAMES; j++) {
offs2 = 0;
for (k=0; k<LPC_GAIN_ORDER; k++) {
sum = 0;
pos = offsg;
pos2 = offs2;
for (n=0; n<LPC_GAIN_ORDER; n++)
sum += tmpcoeffs_g[pos++] * WebRtcIsac_kKltT1Gain[model][pos2++];
tmpcoeffs2_g[posg++] = sum;
offs2 += LPC_GAIN_ORDER;
}
offs2 = 0;
for (k=0; k<LPC_SHAPE_ORDER; k++) {
sum = 0;
pos = offss;
pos2 = offs2;
for (n=0; n<LPC_SHAPE_ORDER; n++)
sum += tmpcoeffs_s[pos++] * WebRtcIsac_kKltT1Shape[model][pos2++];
tmpcoeffs2_s[poss++] = sum;
offs2 += LPC_SHAPE_ORDER;
}
offsg += LPC_GAIN_ORDER;
offss += LPC_SHAPE_ORDER;
}
/* right transform */ // Transpose matrix
offsg = 0;
offss = 0;
posg = 0;
poss = 0;
for (j=0; j<SUBFRAMES; j++) {
posg = offsg;
for (k=0; k<LPC_GAIN_ORDER; k++) {
sum = 0;
pos = k;
pos2 = j;
for (n=0; n<SUBFRAMES; n++) {
sum += tmpcoeffs2_g[pos] * WebRtcIsac_kKltT2Gain[model][pos2];
pos += LPC_GAIN_ORDER;
pos2 += SUBFRAMES;
}
tmpcoeffs_g[posg++] = sum;
}
poss = offss;
for (k=0; k<LPC_SHAPE_ORDER; k++) {
sum = 0;
pos = k;
pos2 = j;
for (n=0; n<SUBFRAMES; n++) {
sum += tmpcoeffs2_s[pos] * WebRtcIsac_kKltT2Shape[model][pos2];
pos += LPC_SHAPE_ORDER;
pos2 += SUBFRAMES;
}
tmpcoeffs_s[poss++] = sum;
}
offsg += LPC_GAIN_ORDER;
offss += LPC_SHAPE_ORDER;
}
/* scaling, mean addition, and gain restoration */
posg = 0;poss = 0;pos=0;
for (k=0; k<SUBFRAMES; k++) {
/* log gains */
LPCCoef[pos] = tmpcoeffs_g[posg] / LPC_GAIN_SCALE;
LPCCoef[pos] += WebRtcIsac_kLpcMeansGain[model][posg];
LPCCoef[pos] = exp(LPCCoef[pos]);
pos++;posg++;
LPCCoef[pos] = tmpcoeffs_g[posg] / LPC_GAIN_SCALE;
LPCCoef[pos] += WebRtcIsac_kLpcMeansGain[model][posg];
LPCCoef[pos] = exp(LPCCoef[pos]);
pos++;posg++;
/* lo band LAR coeffs */
for (n=0; n<LPC_LOBAND_ORDER; n++, pos++, poss++) {
LPCCoef[pos] = tmpcoeffs_s[poss] / LPC_LOBAND_SCALE;
LPCCoef[pos] += WebRtcIsac_kLpcMeansShape[model][poss];
}
/* hi band LAR coeffs */
for (n=0; n<LPC_HIBAND_ORDER; n++, pos++, poss++) {
LPCCoef[pos] = tmpcoeffs_s[poss] / LPC_HIBAND_SCALE;
LPCCoef[pos] += WebRtcIsac_kLpcMeansShape[model][poss];
}
}
*outmodel=model;
return 0;
}
/* estimate codel length of LPC Coef */
void WebRtcIsac_EncodeLar(double *LPCCoef, int *model, double *size, Bitstr *streamdata, ISAC_SaveEncData_t* encData) {
int j, k, n, bmodel, pos, pos2, poss, posg, offsg, offss, offs2;
int index_g[KLT_ORDER_GAIN], index_s[KLT_ORDER_SHAPE];
int index_ovr_g[KLT_ORDER_GAIN], index_ovr_s[KLT_ORDER_SHAPE];
double Bits;
double tmpcoeffs_g[KLT_ORDER_GAIN], tmpcoeffs_s[KLT_ORDER_SHAPE];
double tmpcoeffs2_g[KLT_ORDER_GAIN], tmpcoeffs2_s[KLT_ORDER_SHAPE];
double sum;
/* Only one LPC model remains in iSAC. Tables for other models are saved for compatibility reasons. */
bmodel = 0;
/* log gains, mean removal and scaling */
posg = 0;poss = 0;pos=0;
for (k=0; k<SUBFRAMES; k++) {
/* log gains */
tmpcoeffs_g[posg] = log(LPCCoef[pos]);
tmpcoeffs_g[posg] -= WebRtcIsac_kLpcMeansGain[bmodel][posg];
tmpcoeffs_g[posg] *= LPC_GAIN_SCALE;
posg++;pos++;
tmpcoeffs_g[posg] = log(LPCCoef[pos]);
tmpcoeffs_g[posg] -= WebRtcIsac_kLpcMeansGain[bmodel][posg];
tmpcoeffs_g[posg] *= LPC_GAIN_SCALE;
posg++;pos++;
/* lo band LAR coeffs */
for (n=0; n<LPC_LOBAND_ORDER; n++, poss++, pos++) {
tmpcoeffs_s[poss] = LPCCoef[pos] - WebRtcIsac_kLpcMeansShape[bmodel][poss];
tmpcoeffs_s[poss] *= LPC_LOBAND_SCALE;
}
/* hi band LAR coeffs */
for (n=0; n<LPC_HIBAND_ORDER; n++, poss++, pos++) {
tmpcoeffs_s[poss] = LPCCoef[pos] - WebRtcIsac_kLpcMeansShape[bmodel][poss];
tmpcoeffs_s[poss] *= LPC_HIBAND_SCALE;
}
}
/* KLT */
/* left transform */
offsg = 0;
offss = 0;
for (j=0; j<SUBFRAMES; j++) {
posg = offsg;
for (k=0; k<LPC_GAIN_ORDER; k++) {
sum = 0;
pos = offsg;
pos2 = k;
for (n=0; n<LPC_GAIN_ORDER; n++) {
sum += tmpcoeffs_g[pos++] * WebRtcIsac_kKltT1Gain[bmodel][pos2];
pos2 += LPC_GAIN_ORDER;
}
tmpcoeffs2_g[posg++] = sum;
}
poss = offss;
for (k=0; k<LPC_SHAPE_ORDER; k++) {
sum = 0;
pos = offss;
pos2 = k;
for (n=0; n<LPC_SHAPE_ORDER; n++) {
sum += tmpcoeffs_s[pos++] * WebRtcIsac_kKltT1Shape[bmodel][pos2];
pos2 += LPC_SHAPE_ORDER;
}
tmpcoeffs2_s[poss++] = sum;
}
offsg += LPC_GAIN_ORDER;
offss += LPC_SHAPE_ORDER;
}
/* right transform */
offsg = 0;
offss = 0;
offs2 = 0;
for (j=0; j<SUBFRAMES; j++) {
posg = offsg;
for (k=0; k<LPC_GAIN_ORDER; k++) {
sum = 0;
pos = k;
pos2 = offs2;
for (n=0; n<SUBFRAMES; n++) {
sum += tmpcoeffs2_g[pos] * WebRtcIsac_kKltT2Gain[bmodel][pos2++];
pos += LPC_GAIN_ORDER;
}
tmpcoeffs_g[posg++] = sum;
}
poss = offss;
for (k=0; k<LPC_SHAPE_ORDER; k++) {
sum = 0;
pos = k;
pos2 = offs2;
for (n=0; n<SUBFRAMES; n++) {
sum += tmpcoeffs2_s[pos] * WebRtcIsac_kKltT2Shape[bmodel][pos2++];
pos += LPC_SHAPE_ORDER;
}
tmpcoeffs_s[poss++] = sum;
}
offs2 += SUBFRAMES;
offsg += LPC_GAIN_ORDER;
offss += LPC_SHAPE_ORDER;
}
/* quantize coefficients */
Bits = 0.0;
for (k=0; k<KLT_ORDER_GAIN; k++) //ATTN: ok?
{
pos = WebRtcIsac_kQKltSelIndGain[k];
pos2= WebRtcIsac_lrint(tmpcoeffs_g[pos] / KLT_STEPSIZE);
index_g[k] = (pos2) + WebRtcIsac_kQKltQuantMinGain[k]; //ATTN: ok?
if (index_g[k] < 0) {
index_g[k] = 0;
}
else if (index_g[k] > WebRtcIsac_kQKltMaxIndGain[k])
index_g[k] = WebRtcIsac_kQKltMaxIndGain[k];
index_ovr_g[k] = WebRtcIsac_kQKltOffsetGain[bmodel][k]+index_g[k];
pos = WebRtcIsac_kQKltOfLevelsGain[bmodel] + index_ovr_g[k];
/* determine number of bits */
sum = WebRtcIsac_kQKltCodeLenGain[pos];
Bits += sum;
}
for (k=0; k<KLT_ORDER_SHAPE; k++) //ATTN: ok?
{
index_s[k] = (WebRtcIsac_lrint(tmpcoeffs_s[WebRtcIsac_kQKltSelIndShape[k]] / KLT_STEPSIZE)) + WebRtcIsac_kQKltQuantMinShape[k]; //ATTN: ok?
if (index_s[k] < 0)
index_s[k] = 0;
else if (index_s[k] > WebRtcIsac_kQKltMaxIndShape[k])
index_s[k] = WebRtcIsac_kQKltMaxIndShape[k];
index_ovr_s[k] = WebRtcIsac_kQKltOffsetShape[bmodel][k]+index_s[k];
pos = WebRtcIsac_kQKltOfLevelsShape[bmodel] + index_ovr_s[k];
sum = WebRtcIsac_kQKltCodeLenShape[pos];
Bits += sum;
}
/* Only one model remains in this version of the code, model = 0 */
*model=bmodel;
*size=Bits;
/* entropy coding of model number */
WebRtcIsac_EncHistMulti(streamdata, model, WebRtcIsac_kQKltModelCdfPtr, 1);
/* entropy coding of quantization indices - shape only */
WebRtcIsac_EncHistMulti(streamdata, index_s, WebRtcIsac_kQKltCdfPtrShape[bmodel], KLT_ORDER_SHAPE);
/* Save data for creation of multiple bit streams */
encData->LPCmodel[encData->startIdx] = 0;
for (k=0; k<KLT_ORDER_SHAPE; k++)
{
encData->LPCindex_s[KLT_ORDER_SHAPE*encData->startIdx + k] = index_s[k];
}
/* find quantization levels for shape coefficients */
for (k=0; k<KLT_ORDER_SHAPE; k++) {
tmpcoeffs_s[WebRtcIsac_kQKltSelIndShape[k]] = WebRtcIsac_kQKltLevelsShape[WebRtcIsac_kQKltOfLevelsShape[bmodel]+index_ovr_s[k]];
}
/* inverse KLT */
/* left transform */ // Transpose matrix!
offss = 0;
poss = 0;
for (j=0; j<SUBFRAMES; j++) {
offs2 = 0;
for (k=0; k<LPC_SHAPE_ORDER; k++) {
sum = 0;
pos = offss;
pos2 = offs2;
for (n=0; n<LPC_SHAPE_ORDER; n++)
sum += tmpcoeffs_s[pos++] * WebRtcIsac_kKltT1Shape[bmodel][pos2++];
tmpcoeffs2_s[poss++] = sum;
offs2 += LPC_SHAPE_ORDER;
}
offss += LPC_SHAPE_ORDER;
}
/* right transform */ // Transpose matrix
offss = 0;
poss = 0;
for (j=0; j<SUBFRAMES; j++) {
poss = offss;
for (k=0; k<LPC_SHAPE_ORDER; k++) {
sum = 0;
pos = k;
pos2 = j;
for (n=0; n<SUBFRAMES; n++) {
sum += tmpcoeffs2_s[pos] * WebRtcIsac_kKltT2Shape[bmodel][pos2];
pos += LPC_SHAPE_ORDER;
pos2 += SUBFRAMES;
}
tmpcoeffs_s[poss++] = sum;
}
offss += LPC_SHAPE_ORDER;
}
/* scaling, mean addition, and gain restoration */
poss = 0;pos=0;
for (k=0; k<SUBFRAMES; k++) {
/* log gains */
pos+=2;
/* lo band LAR coeffs */
for (n=0; n<LPC_LOBAND_ORDER; n++, pos++, poss++) {
LPCCoef[pos] = tmpcoeffs_s[poss] / LPC_LOBAND_SCALE;
LPCCoef[pos] += WebRtcIsac_kLpcMeansShape[bmodel][poss];
}
/* hi band LAR coeffs */
for (n=0; n<LPC_HIBAND_ORDER; n++, pos++, poss++) {
LPCCoef[pos] = tmpcoeffs_s[poss] / LPC_HIBAND_SCALE;
LPCCoef[pos] += WebRtcIsac_kLpcMeansShape[bmodel][poss];
}
}
}
void WebRtcIsac_EncodeLpcLb(double *LPCCoef_lo, double *LPCCoef_hi, int *model,
double *size, Bitstr *streamdata, ISAC_SaveEncData_t* encData) {
double lars[KLT_ORDER_GAIN+KLT_ORDER_SHAPE];
int k;
WebRtcIsac_Poly2Lar(LPCCoef_lo, ORDERLO, LPCCoef_hi, ORDERHI, SUBFRAMES, lars);
WebRtcIsac_EncodeLar(lars, model, size, streamdata, encData);
WebRtcIsac_Lar2Poly(lars, LPCCoef_lo, ORDERLO, LPCCoef_hi, ORDERHI, SUBFRAMES);
/* Save data for creation of multiple bit streams (and transcoding) */
for (k=0; k<(ORDERLO+1)*SUBFRAMES; k++) {
encData->LPCcoeffs_lo[(ORDERLO+1)*SUBFRAMES*encData->startIdx + k] = LPCCoef_lo[k];
}
for (k=0; k<(ORDERHI+1)*SUBFRAMES; k++) {
encData->LPCcoeffs_hi[(ORDERHI+1)*SUBFRAMES*encData->startIdx + k] = LPCCoef_hi[k];
}
}
WebRtc_Word16
WebRtcIsac_EncodeLpcUB(
double* lpcVecs,
Bitstr* streamdata,
double* interpolLPCCoeff,
WebRtc_Word16 bandwidth,
ISACUBSaveEncDataStruct* encData)
{
double U[UB_LPC_ORDER * UB16_LPC_VEC_PER_FRAME];
int idx[UB_LPC_ORDER * UB16_LPC_VEC_PER_FRAME];
int interpolCntr;
WebRtcIsac_Poly2LarUB(lpcVecs, bandwidth);
WebRtcIsac_RemoveLarMean(lpcVecs, bandwidth);
WebRtcIsac_DecorrelateIntraVec(lpcVecs, U, bandwidth);
WebRtcIsac_DecorrelateInterVec(U, lpcVecs, bandwidth);
WebRtcIsac_QuantizeUncorrLar(lpcVecs, idx, bandwidth);
WebRtcIsac_CorrelateInterVec(lpcVecs, U, bandwidth);
WebRtcIsac_CorrelateIntraVec(U, lpcVecs, bandwidth);
WebRtcIsac_AddLarMean(lpcVecs, bandwidth);
switch(bandwidth)
{
case isac12kHz:
{
// Stor the indices to be used for multiple encoding.
memcpy(encData->indexLPCShape, idx, UB_LPC_ORDER * UB_LPC_VEC_PER_FRAME *
sizeof(int));
WebRtcIsac_EncHistMulti(streamdata, idx, WebRtcIsac_kLpcShapeCdfMatUb12,
UB_LPC_ORDER * UB_LPC_VEC_PER_FRAME);
for(interpolCntr = 0; interpolCntr < UB_INTERPOL_SEGMENTS; interpolCntr++)
{
WebRtcIsac_Lar2PolyInterpolUB(lpcVecs,
interpolLPCCoeff, kLpcVecPerSegmentUb12 + 1);
lpcVecs += UB_LPC_ORDER;
interpolLPCCoeff += (kLpcVecPerSegmentUb12 * (UB_LPC_ORDER + 1));
}
break;
}
case isac16kHz:
{
// Stor the indices to be used for multiple encoding.
memcpy(encData->indexLPCShape, idx, UB_LPC_ORDER * UB16_LPC_VEC_PER_FRAME *
sizeof(int));
WebRtcIsac_EncHistMulti(streamdata, idx, WebRtcIsac_kLpcShapeCdfMatUb16,
UB_LPC_ORDER * UB16_LPC_VEC_PER_FRAME);
for(interpolCntr = 0; interpolCntr < UB16_INTERPOL_SEGMENTS; interpolCntr++)
{
WebRtcIsac_Lar2PolyInterpolUB(lpcVecs,
interpolLPCCoeff, kLpcVecPerSegmentUb16 + 1);
lpcVecs += UB_LPC_ORDER;
interpolLPCCoeff += (kLpcVecPerSegmentUb16 * (UB_LPC_ORDER + 1));
}
break;
}
default:
return -1;
}
return 0;
}
void WebRtcIsac_EncodeLpcGainLb(double *LPCCoef_lo, double *LPCCoef_hi, int model, Bitstr *streamdata, ISAC_SaveEncData_t* encData) {
int j, k, n, pos, pos2, posg, offsg, offs2;
int index_g[KLT_ORDER_GAIN];
int index_ovr_g[KLT_ORDER_GAIN];
double tmpcoeffs_g[KLT_ORDER_GAIN];
double tmpcoeffs2_g[KLT_ORDER_GAIN];
double sum;
/* log gains, mean removal and scaling */
posg = 0;
for (k=0; k<SUBFRAMES; k++) {
tmpcoeffs_g[posg] = log(LPCCoef_lo[(LPC_LOBAND_ORDER+1)*k]);
tmpcoeffs_g[posg] -= WebRtcIsac_kLpcMeansGain[model][posg];
tmpcoeffs_g[posg] *= LPC_GAIN_SCALE;
posg++;
tmpcoeffs_g[posg] = log(LPCCoef_hi[(LPC_HIBAND_ORDER+1)*k]);
tmpcoeffs_g[posg] -= WebRtcIsac_kLpcMeansGain[model][posg];
tmpcoeffs_g[posg] *= LPC_GAIN_SCALE;
posg++;
}
/* KLT */
/* left transform */
offsg = 0;
for (j=0; j<SUBFRAMES; j++) {
posg = offsg;
for (k=0; k<LPC_GAIN_ORDER; k++) {
sum = 0;
pos = offsg;
pos2 = k;
for (n=0; n<LPC_GAIN_ORDER; n++) {
sum += tmpcoeffs_g[pos++] * WebRtcIsac_kKltT1Gain[model][pos2];
pos2 += LPC_GAIN_ORDER;
}
tmpcoeffs2_g[posg++] = sum;
}
offsg += LPC_GAIN_ORDER;
}
/* right transform */
offsg = 0;
offs2 = 0;
for (j=0; j<SUBFRAMES; j++) {
posg = offsg;
for (k=0; k<LPC_GAIN_ORDER; k++) {
sum = 0;
pos = k;
pos2 = offs2;
for (n=0; n<SUBFRAMES; n++) {
sum += tmpcoeffs2_g[pos] * WebRtcIsac_kKltT2Gain[model][pos2++];
pos += LPC_GAIN_ORDER;
}
tmpcoeffs_g[posg++] = sum;
}
offs2 += SUBFRAMES;
offsg += LPC_GAIN_ORDER;
}
/* quantize coefficients */
for (k=0; k<KLT_ORDER_GAIN; k++) {
/* get index */
pos = WebRtcIsac_kQKltSelIndGain[k];
pos2= WebRtcIsac_lrint(tmpcoeffs_g[pos] / KLT_STEPSIZE);
index_g[k] = (pos2) + WebRtcIsac_kQKltQuantMinGain[k];
if (index_g[k] < 0) {
index_g[k] = 0;
}
else if (index_g[k] > WebRtcIsac_kQKltMaxIndGain[k]) {
index_g[k] = WebRtcIsac_kQKltMaxIndGain[k];
}
index_ovr_g[k] = WebRtcIsac_kQKltOffsetGain[model][k]+index_g[k];
/* find quantization levels for coefficients */
tmpcoeffs_g[WebRtcIsac_kQKltSelIndGain[k]] = WebRtcIsac_kQKltLevelsGain[WebRtcIsac_kQKltOfLevelsGain[model]+index_ovr_g[k]];
/* Save data for creation of multiple bit streams */
encData->LPCindex_g[KLT_ORDER_GAIN*encData->startIdx + k] = index_g[k];
}
/* entropy coding of quantization indices - gain */
WebRtcIsac_EncHistMulti(streamdata, index_g, WebRtcIsac_kQKltCdfPtrGain[model], KLT_ORDER_GAIN);
/* find quantization levels for coefficients */
/* left transform */
offsg = 0;
posg = 0;
for (j=0; j<SUBFRAMES; j++) {
offs2 = 0;
for (k=0; k<LPC_GAIN_ORDER; k++) {
sum = 0;
pos = offsg;
pos2 = offs2;
for (n=0; n<LPC_GAIN_ORDER; n++)
sum += tmpcoeffs_g[pos++] * WebRtcIsac_kKltT1Gain[model][pos2++];
tmpcoeffs2_g[posg++] = sum;
offs2 += LPC_GAIN_ORDER;
}
offsg += LPC_GAIN_ORDER;
}
/* right transform */ // Transpose matrix
offsg = 0;
posg = 0;
for (j=0; j<SUBFRAMES; j++) {
posg = offsg;
for (k=0; k<LPC_GAIN_ORDER; k++) {
sum = 0;
pos = k;
pos2 = j;
for (n=0; n<SUBFRAMES; n++) {
sum += tmpcoeffs2_g[pos] * WebRtcIsac_kKltT2Gain[model][pos2];
pos += LPC_GAIN_ORDER;
pos2 += SUBFRAMES;
}
tmpcoeffs_g[posg++] = sum;
}
offsg += LPC_GAIN_ORDER;
}
/* scaling, mean addition, and gain restoration */
posg = 0;
for (k=0; k<SUBFRAMES; k++) {
sum = tmpcoeffs_g[posg] / LPC_GAIN_SCALE;
sum += WebRtcIsac_kLpcMeansGain[model][posg];
LPCCoef_lo[k*(LPC_LOBAND_ORDER+1)] = exp(sum);
pos++;posg++;
sum = tmpcoeffs_g[posg] / LPC_GAIN_SCALE;
sum += WebRtcIsac_kLpcMeansGain[model][posg];
LPCCoef_hi[k*(LPC_HIBAND_ORDER+1)] = exp(sum);
pos++;posg++;
}
}
void
WebRtcIsac_EncodeLpcGainUb(
double* lpGains,
Bitstr* streamdata,
int* lpcGainIndex)
{
double U[UB_LPC_GAIN_DIM];
int idx[UB_LPC_GAIN_DIM];
WebRtcIsac_ToLogDomainRemoveMean(lpGains);
WebRtcIsac_DecorrelateLPGain(lpGains, U);
WebRtcIsac_QuantizeLpcGain(U, idx);
// Store the index for re-encoding for FEC.
memcpy(lpcGainIndex, idx, UB_LPC_GAIN_DIM * sizeof(int));
WebRtcIsac_CorrelateLpcGain(U, lpGains);
WebRtcIsac_AddMeanToLinearDomain(lpGains);
WebRtcIsac_EncHistMulti(streamdata, idx, WebRtcIsac_kLpcGainCdfMat, UB_LPC_GAIN_DIM);
}
void
WebRtcIsac_StoreLpcGainUb(
double* lpGains,
Bitstr* streamdata)
{
double U[UB_LPC_GAIN_DIM];
int idx[UB_LPC_GAIN_DIM];
WebRtcIsac_ToLogDomainRemoveMean(lpGains);
WebRtcIsac_DecorrelateLPGain(lpGains, U);
WebRtcIsac_QuantizeLpcGain(U, idx);
WebRtcIsac_EncHistMulti(streamdata, idx, WebRtcIsac_kLpcGainCdfMat, UB_LPC_GAIN_DIM);
}
WebRtc_Word16
WebRtcIsac_DecodeLpcGainUb(
double* lpGains,
Bitstr* streamdata)
{
double U[UB_LPC_GAIN_DIM];
int idx[UB_LPC_GAIN_DIM];
int err;
err = WebRtcIsac_DecHistOneStepMulti(idx, streamdata,
WebRtcIsac_kLpcGainCdfMat, WebRtcIsac_kLpcGainEntropySearch,
UB_LPC_GAIN_DIM);
if(err < 0)
{
return -1;
}
WebRtcIsac_DequantizeLpcGain(idx, U);
WebRtcIsac_CorrelateLpcGain(U, lpGains);
WebRtcIsac_AddMeanToLinearDomain(lpGains);
return 0;
}
/* decode & dequantize RC */
int WebRtcIsac_DecodeRc(Bitstr *streamdata, WebRtc_Word16 *RCQ15)
{
int k, err;
int index[AR_ORDER];
/* entropy decoding of quantization indices */
err = WebRtcIsac_DecHistOneStepMulti(index, streamdata, WebRtcIsac_kQArRcCdfPtr,
WebRtcIsac_kQArRcInitIndex, AR_ORDER);
if (err<0) // error check
return err;
/* find quantization levels for reflection coefficients */
for (k=0; k<AR_ORDER; k++)
{
RCQ15[k] = *(WebRtcIsac_kQArRcLevelsPtr[k] + index[k]);
}
return 0;
}
/* quantize & code RC */
void WebRtcIsac_EncodeRc(WebRtc_Word16 *RCQ15, Bitstr *streamdata)
{
int k;
int index[AR_ORDER];
/* quantize reflection coefficients (add noise feedback?) */
for (k=0; k<AR_ORDER; k++)
{
index[k] = WebRtcIsac_kQArRcInitIndex[k];
if (RCQ15[k] > WebRtcIsac_kQArBoundaryLevels[index[k]])
{
while (RCQ15[k] > WebRtcIsac_kQArBoundaryLevels[index[k] + 1])
index[k]++;
}
else
{
while (RCQ15[k] < WebRtcIsac_kQArBoundaryLevels[--index[k]]) ;
}
RCQ15[k] = *(WebRtcIsac_kQArRcLevelsPtr[k] + index[k]);
}
/* entropy coding of quantization indices */
WebRtcIsac_EncHistMulti(streamdata, index, WebRtcIsac_kQArRcCdfPtr, AR_ORDER);
}
/* decode & dequantize squared Gain */
int WebRtcIsac_DecodeGain2(Bitstr *streamdata, WebRtc_Word32 *gainQ10)
{
int index, err;
/* entropy decoding of quantization index */
err = WebRtcIsac_DecHistOneStepMulti(&index, streamdata, WebRtcIsac_kQGainCdf_ptr,
WebRtcIsac_kQGainInitIndex, 1);
if (err<0) // error check
return err;
/* find quantization level */
*gainQ10 = WebRtcIsac_kQGain2Levels[index];
return 0;
}
/* quantize & code squared Gain */
int WebRtcIsac_EncodeGain2(WebRtc_Word32 *gainQ10, Bitstr *streamdata)
{
int index;
/* find quantization index */
index = WebRtcIsac_kQGainInitIndex[0];
if (*gainQ10 > WebRtcIsac_kQGain2BoundaryLevels[index])
{
while (*gainQ10 > WebRtcIsac_kQGain2BoundaryLevels[index + 1])
index++;
}
else
{
while (*gainQ10 < WebRtcIsac_kQGain2BoundaryLevels[--index]) ;
}
/* dequantize */
*gainQ10 = WebRtcIsac_kQGain2Levels[index];
/* entropy coding of quantization index */
WebRtcIsac_EncHistMulti(streamdata, &index, WebRtcIsac_kQGainCdf_ptr, 1);
return 0;
}
/* code and decode Pitch Gains and Lags functions */
/* decode & dequantize Pitch Gains */
int WebRtcIsac_DecodePitchGain(Bitstr *streamdata, WebRtc_Word16 *PitchGains_Q12)
{
int index_comb, err;
const WebRtc_UWord16 *WebRtcIsac_kQPitchGainCdf_ptr[1];
/* entropy decoding of quantization indices */
*WebRtcIsac_kQPitchGainCdf_ptr = WebRtcIsac_kQPitchGainCdf;
err = WebRtcIsac_DecHistBisectMulti(&index_comb, streamdata, WebRtcIsac_kQPitchGainCdf_ptr, WebRtcIsac_kQCdfTableSizeGain, 1);
/* error check, Q_mean_Gain.. tables are of size 144 */
if ((err<0) || (index_comb<0) || (index_comb>144))
return -ISAC_RANGE_ERROR_DECODE_PITCH_GAIN;
/* unquantize back to pitch gains by table look-up */
PitchGains_Q12[0] = WebRtcIsac_kQMeanGain1Q12[index_comb];
PitchGains_Q12[1] = WebRtcIsac_kQMeanGain2Q12[index_comb];
PitchGains_Q12[2] = WebRtcIsac_kQMeanGain3Q12[index_comb];
PitchGains_Q12[3] = WebRtcIsac_kQMeanGain4Q12[index_comb];
return 0;
}
/* quantize & code Pitch Gains */
void WebRtcIsac_EncodePitchGain(WebRtc_Word16 *PitchGains_Q12, Bitstr *streamdata, ISAC_SaveEncData_t* encData)
{
int k,j;
double C;
double S[PITCH_SUBFRAMES];
int index[3];
int index_comb;
const WebRtc_UWord16 *WebRtcIsac_kQPitchGainCdf_ptr[1];
double PitchGains[PITCH_SUBFRAMES] = {0,0,0,0};
/* take the asin */
for (k=0; k<PITCH_SUBFRAMES; k++)
{
PitchGains[k] = ((float)PitchGains_Q12[k])/4096;
S[k] = asin(PitchGains[k]);
}
/* find quantization index; only for the first three transform coefficients */
for (k=0; k<3; k++)
{
/* transform */
C = 0.0;
for (j=0; j<PITCH_SUBFRAMES; j++)
C += WebRtcIsac_kTransform[k][j] * S[j];
/* quantize */
index[k] = WebRtcIsac_lrint(C / PITCH_GAIN_STEPSIZE);
/* check that the index is not outside the boundaries of the table */
if (index[k] < WebRtcIsac_kIndexLowerLimitGain[k]) index[k] = WebRtcIsac_kIndexLowerLimitGain[k];
else if (index[k] > WebRtcIsac_kIndexUpperLimitGain[k]) index[k] = WebRtcIsac_kIndexUpperLimitGain[k];
index[k] -= WebRtcIsac_kIndexLowerLimitGain[k];
}
/* calculate unique overall index */
index_comb = WebRtcIsac_kIndexMultsGain[0] * index[0] + WebRtcIsac_kIndexMultsGain[1] * index[1] + index[2];
/* unquantize back to pitch gains by table look-up */
PitchGains_Q12[0] = WebRtcIsac_kQMeanGain1Q12[index_comb];
PitchGains_Q12[1] = WebRtcIsac_kQMeanGain2Q12[index_comb];
PitchGains_Q12[2] = WebRtcIsac_kQMeanGain3Q12[index_comb];
PitchGains_Q12[3] = WebRtcIsac_kQMeanGain4Q12[index_comb];
/* entropy coding of quantization pitch gains */
*WebRtcIsac_kQPitchGainCdf_ptr = WebRtcIsac_kQPitchGainCdf;
WebRtcIsac_EncHistMulti(streamdata, &index_comb, WebRtcIsac_kQPitchGainCdf_ptr, 1);
encData->pitchGain_index[encData->startIdx] = index_comb;
}
/* Pitch LAG */
/* decode & dequantize Pitch Lags */
int WebRtcIsac_DecodePitchLag(Bitstr *streamdata, WebRtc_Word16 *PitchGain_Q12, double *PitchLags)
{
int k, err;
double StepSize;
double C;
int index[PITCH_SUBFRAMES];
double mean_gain;
const double *mean_val2, *mean_val3, *mean_val4;
const WebRtc_Word16 *lower_limit;
const WebRtc_UWord16 *init_index;
const WebRtc_UWord16 *cdf_size;
const WebRtc_UWord16 **cdf;
//(Y)
double PitchGain[4]={0,0,0,0};
//
/* compute mean pitch gain */
mean_gain = 0.0;
for (k = 0; k < 4; k++)
{
//(Y)
PitchGain[k] = ((float)PitchGain_Q12[k])/4096;
//(Y)
mean_gain += PitchGain[k];
}
mean_gain /= 4.0;
/* voicing classificiation */
if (mean_gain < 0.2) {
StepSize = WebRtcIsac_kQPitchLagStepsizeLo;
cdf = WebRtcIsac_kQPitchLagCdfPtrLo;
cdf_size = WebRtcIsac_kQPitchLagCdfSizeLo;
mean_val2 = WebRtcIsac_kQMeanLag2Lo;
mean_val3 = WebRtcIsac_kQMeanLag3Lo;
mean_val4 = WebRtcIsac_kQMeanLag4Lo;
lower_limit = WebRtcIsac_kQIndexLowerLimitLagLo;
init_index = WebRtcIsac_kQInitIndexLagLo;
} else if (mean_gain < 0.4) {
StepSize = WebRtcIsac_kQPitchLagStepsizeMid;
cdf = WebRtcIsac_kQPitchLagCdfPtrMid;
cdf_size = WebRtcIsac_kQPitchLagCdfSizeMid;
mean_val2 = WebRtcIsac_kQMeanLag2Mid;
mean_val3 = WebRtcIsac_kQMeanLag3Mid;
mean_val4 = WebRtcIsac_kQMeanLag4Mid;
lower_limit = WebRtcIsac_kQIndexLowerLimitLagMid;
init_index = WebRtcIsac_kQInitIndexLagMid;
} else {
StepSize = WebRtcIsac_kQPitchLagStepsizeHi;
cdf = WebRtcIsac_kQPitchLagCdfPtrHi;
cdf_size = WebRtcIsac_kQPitchLagCdfSizeHi;
mean_val2 = WebRtcIsac_kQMeanLag2Hi;
mean_val3 = WebRtcIsac_kQMeanLag3Hi;
mean_val4 = WebRtcIsac_kQMeanLag4Hi;
lower_limit = WebRtcIsac_kQindexLowerLimitLagHi;
init_index = WebRtcIsac_kQInitIndexLagHi;
}
/* entropy decoding of quantization indices */
err = WebRtcIsac_DecHistBisectMulti(index, streamdata, cdf, cdf_size, 1);
if ((err<0) || (index[0]<0)) // error check
return -ISAC_RANGE_ERROR_DECODE_PITCH_LAG;
err = WebRtcIsac_DecHistOneStepMulti(index+1, streamdata, cdf+1, init_index, 3);
if (err<0) // error check
return -ISAC_RANGE_ERROR_DECODE_PITCH_LAG;
/* unquantize back to transform coefficients and do the inverse transform: S = T'*C */
C = (index[0] + lower_limit[0]) * StepSize;
for (k=0; k<PITCH_SUBFRAMES; k++)
PitchLags[k] = WebRtcIsac_kTransformTranspose[k][0] * C;
C = mean_val2[index[1]];
for (k=0; k<PITCH_SUBFRAMES; k++)
PitchLags[k] += WebRtcIsac_kTransformTranspose[k][1] * C;
C = mean_val3[index[2]];
for (k=0; k<PITCH_SUBFRAMES; k++)
PitchLags[k] += WebRtcIsac_kTransformTranspose[k][2] * C;
C = mean_val4[index[3]];
for (k=0; k<PITCH_SUBFRAMES; k++)
PitchLags[k] += WebRtcIsac_kTransformTranspose[k][3] * C;
return 0;
}
/* quantize & code Pitch Lags */
void WebRtcIsac_EncodePitchLag(double* PitchLags, WebRtc_Word16* PitchGain_Q12, Bitstr* streamdata, ISAC_SaveEncData_t* encData)
{
int k, j;
double StepSize;
double C;
int index[PITCH_SUBFRAMES];
double mean_gain;
const double *mean_val2, *mean_val3, *mean_val4;
const WebRtc_Word16 *lower_limit, *upper_limit;
const WebRtc_UWord16 **cdf;
//(Y)
double PitchGain[4]={0,0,0,0};
//
/* compute mean pitch gain */
mean_gain = 0.0;
for (k = 0; k < 4; k++)
{
//(Y)
PitchGain[k] = ((float)PitchGain_Q12[k])/4096;
//(Y)
mean_gain += PitchGain[k];
}
mean_gain /= 4.0;
/* Save data for creation of multiple bit streams */
encData->meanGain[encData->startIdx] = mean_gain;
/* voicing classification */
if (mean_gain < 0.2) {
StepSize = WebRtcIsac_kQPitchLagStepsizeLo;
cdf = WebRtcIsac_kQPitchLagCdfPtrLo;
mean_val2 = WebRtcIsac_kQMeanLag2Lo;
mean_val3 = WebRtcIsac_kQMeanLag3Lo;
mean_val4 = WebRtcIsac_kQMeanLag4Lo;
lower_limit = WebRtcIsac_kQIndexLowerLimitLagLo;
upper_limit = WebRtcIsac_kQIndexUpperLimitLagLo;
} else if (mean_gain < 0.4) {
StepSize = WebRtcIsac_kQPitchLagStepsizeMid;
cdf = WebRtcIsac_kQPitchLagCdfPtrMid;
mean_val2 = WebRtcIsac_kQMeanLag2Mid;
mean_val3 = WebRtcIsac_kQMeanLag3Mid;
mean_val4 = WebRtcIsac_kQMeanLag4Mid;
lower_limit = WebRtcIsac_kQIndexLowerLimitLagMid;
upper_limit = WebRtcIsac_kQIndexUpperLimitLagMid;
} else {
StepSize = WebRtcIsac_kQPitchLagStepsizeHi;
cdf = WebRtcIsac_kQPitchLagCdfPtrHi;
mean_val2 = WebRtcIsac_kQMeanLag2Hi;
mean_val3 = WebRtcIsac_kQMeanLag3Hi;
mean_val4 = WebRtcIsac_kQMeanLag4Hi;
lower_limit = WebRtcIsac_kQindexLowerLimitLagHi;
upper_limit = WebRtcIsac_kQindexUpperLimitLagHi;
}
/* find quantization index */
for (k=0; k<4; k++)
{
/* transform */
C = 0.0;
for (j=0; j<PITCH_SUBFRAMES; j++)
C += WebRtcIsac_kTransform[k][j] * PitchLags[j];
/* quantize */
index[k] = WebRtcIsac_lrint(C / StepSize);
/* check that the index is not outside the boundaries of the table */
if (index[k] < lower_limit[k]) index[k] = lower_limit[k];
else if (index[k] > upper_limit[k]) index[k] = upper_limit[k];
index[k] -= lower_limit[k];
/* Save data for creation of multiple bit streams */
encData->pitchIndex[PITCH_SUBFRAMES*encData->startIdx + k] = index[k];
}
/* unquantize back to transform coefficients and do the inverse transform: S = T'*C */
C = (index[0] + lower_limit[0]) * StepSize;
for (k=0; k<PITCH_SUBFRAMES; k++)
PitchLags[k] = WebRtcIsac_kTransformTranspose[k][0] * C;
C = mean_val2[index[1]];
for (k=0; k<PITCH_SUBFRAMES; k++)
PitchLags[k] += WebRtcIsac_kTransformTranspose[k][1] * C;
C = mean_val3[index[2]];
for (k=0; k<PITCH_SUBFRAMES; k++)
PitchLags[k] += WebRtcIsac_kTransformTranspose[k][2] * C;
C = mean_val4[index[3]];
for (k=0; k<PITCH_SUBFRAMES; k++)
PitchLags[k] += WebRtcIsac_kTransformTranspose[k][3] * C;
/* entropy coding of quantization pitch lags */
WebRtcIsac_EncHistMulti(streamdata, index, cdf, PITCH_SUBFRAMES);
}
/* Routines for in-band signaling of bandwidth estimation */
/* Histograms based on uniform distribution of indices */
/* Move global variables later! */
/* cdf array for frame length indicator */
const WebRtc_UWord16 WebRtcIsac_kFrameLengthCdf[4] = {
0, 21845, 43690, 65535};
/* pointer to cdf array for frame length indicator */
const WebRtc_UWord16 *WebRtcIsac_kFrameLengthCdf_ptr[1] = {WebRtcIsac_kFrameLengthCdf};
/* initial cdf index for decoder of frame length indicator */
const WebRtc_UWord16 WebRtcIsac_kFrameLengthInitIndex[1] = {1};
int WebRtcIsac_DecodeFrameLen(Bitstr *streamdata,
WebRtc_Word16 *framesamples)
{
int frame_mode, err;
err = 0;
/* entropy decoding of frame length [1:30ms,2:60ms] */
err = WebRtcIsac_DecHistOneStepMulti(&frame_mode, streamdata, WebRtcIsac_kFrameLengthCdf_ptr, WebRtcIsac_kFrameLengthInitIndex, 1);
if (err<0) // error check
return -ISAC_RANGE_ERROR_DECODE_FRAME_LENGTH;
switch(frame_mode) {
case 1:
*framesamples = 480; /* 30ms */
break;
case 2:
*framesamples = 960; /* 60ms */
break;
default:
err = -ISAC_DISALLOWED_FRAME_MODE_DECODER;
}
return err;
}
int WebRtcIsac_EncodeFrameLen(WebRtc_Word16 framesamples, Bitstr *streamdata) {
int frame_mode, status;
status = 0;
frame_mode = 0;
/* entropy coding of frame length [1:480 samples,2:960 samples] */
switch(framesamples) {
case 480:
frame_mode = 1;
break;
case 960:
frame_mode = 2;
break;
default:
status = - ISAC_DISALLOWED_FRAME_MODE_ENCODER;
}
if (status < 0)
return status;
WebRtcIsac_EncHistMulti(streamdata, &frame_mode, WebRtcIsac_kFrameLengthCdf_ptr, 1);
return status;
}
/* cdf array for estimated bandwidth */
static const WebRtc_UWord16 kBwCdf[25] = {
0, 2731, 5461, 8192, 10923, 13653, 16384, 19114, 21845, 24576, 27306, 30037,
32768, 35498, 38229, 40959, 43690, 46421, 49151, 51882, 54613, 57343, 60074,
62804, 65535};
/* pointer to cdf array for estimated bandwidth */
static const WebRtc_UWord16 *kBwCdfPtr[1] = { kBwCdf };
/* initial cdf index for decoder of estimated bandwidth*/
static const WebRtc_UWord16 kBwInitIndex[1] = { 7 };
int WebRtcIsac_DecodeSendBW(Bitstr *streamdata, WebRtc_Word16 *BWno) {
int BWno32, err;
/* entropy decoding of sender's BW estimation [0..23] */
err = WebRtcIsac_DecHistOneStepMulti(&BWno32, streamdata, kBwCdfPtr, kBwInitIndex, 1);
if (err<0) // error check
return -ISAC_RANGE_ERROR_DECODE_BANDWIDTH;
*BWno = (WebRtc_Word16)BWno32;
return err;
}
void WebRtcIsac_EncodeReceiveBw(int *BWno, Bitstr *streamdata) {
/* entropy encoding of receiver's BW estimation [0..23] */
WebRtcIsac_EncHistMulti(streamdata, BWno, kBwCdfPtr, 1);
}
/* estimate code length of LPC Coef */
void WebRtcIsac_TranscodeLPCCoef(double *LPCCoef_lo, double *LPCCoef_hi, int model,
int *index_g) {
int j, k, n, pos, pos2, posg, offsg, offs2;
int index_ovr_g[KLT_ORDER_GAIN];
double tmpcoeffs_g[KLT_ORDER_GAIN];
double tmpcoeffs2_g[KLT_ORDER_GAIN];
double sum;
/* log gains, mean removal and scaling */
posg = 0;
for (k=0; k<SUBFRAMES; k++) {
tmpcoeffs_g[posg] = log(LPCCoef_lo[(LPC_LOBAND_ORDER+1)*k]);
tmpcoeffs_g[posg] -= WebRtcIsac_kLpcMeansGain[model][posg];
tmpcoeffs_g[posg] *= LPC_GAIN_SCALE;
posg++;
tmpcoeffs_g[posg] = log(LPCCoef_hi[(LPC_HIBAND_ORDER+1)*k]);
tmpcoeffs_g[posg] -= WebRtcIsac_kLpcMeansGain[model][posg];
tmpcoeffs_g[posg] *= LPC_GAIN_SCALE;
posg++;
}
/* KLT */
/* left transform */
offsg = 0;
for (j=0; j<SUBFRAMES; j++) {
posg = offsg;
for (k=0; k<LPC_GAIN_ORDER; k++) {
sum = 0;
pos = offsg;
pos2 = k;
for (n=0; n<LPC_GAIN_ORDER; n++) {
sum += tmpcoeffs_g[pos++] * WebRtcIsac_kKltT1Gain[model][pos2];
pos2 += LPC_GAIN_ORDER;
}
tmpcoeffs2_g[posg++] = sum;
}
offsg += LPC_GAIN_ORDER;
}
/* right transform */
offsg = 0;
offs2 = 0;
for (j=0; j<SUBFRAMES; j++) {
posg = offsg;
for (k=0; k<LPC_GAIN_ORDER; k++) {
sum = 0;
pos = k;
pos2 = offs2;
for (n=0; n<SUBFRAMES; n++) {
sum += tmpcoeffs2_g[pos] * WebRtcIsac_kKltT2Gain[model][pos2++];
pos += LPC_GAIN_ORDER;
}
tmpcoeffs_g[posg++] = sum;
}
offs2 += SUBFRAMES;
offsg += LPC_GAIN_ORDER;
}
/* quantize coefficients */
for (k=0; k<KLT_ORDER_GAIN; k++) {
/* get index */
pos = WebRtcIsac_kQKltSelIndGain[k];
pos2= WebRtcIsac_lrint(tmpcoeffs_g[pos] / KLT_STEPSIZE);
index_g[k] = (pos2) + WebRtcIsac_kQKltQuantMinGain[k];
if (index_g[k] < 0) {
index_g[k] = 0;
}
else if (index_g[k] > WebRtcIsac_kQKltMaxIndGain[k]) {
index_g[k] = WebRtcIsac_kQKltMaxIndGain[k];
}
index_ovr_g[k] = WebRtcIsac_kQKltOffsetGain[model][k]+index_g[k];
/* find quantization levels for coefficients */
tmpcoeffs_g[WebRtcIsac_kQKltSelIndGain[k]] = WebRtcIsac_kQKltLevelsGain[WebRtcIsac_kQKltOfLevelsGain[model]+index_ovr_g[k]];
}
}
/* decode & dequantize LPC Coef */
int
WebRtcIsac_DecodeLpcCoefUB(
Bitstr* streamdata,
double* lpcVecs,
double* percepFilterGains,
WebRtc_Word16 bandwidth)
{
int index_s[KLT_ORDER_SHAPE];
double U[UB_LPC_ORDER * UB16_LPC_VEC_PER_FRAME];
int err;
/* entropy decoding of quantization indices */
switch(bandwidth)
{
case isac12kHz:
{
err = WebRtcIsac_DecHistOneStepMulti(index_s, streamdata,
WebRtcIsac_kLpcShapeCdfMatUb12, WebRtcIsac_kLpcShapeEntropySearchUb12,
UB_LPC_ORDER * UB_LPC_VEC_PER_FRAME);
break;
}
case isac16kHz:
{
err = WebRtcIsac_DecHistOneStepMulti(index_s, streamdata,
WebRtcIsac_kLpcShapeCdfMatUb16, WebRtcIsac_kLpcShapeEntropySearchUb16,
UB_LPC_ORDER * UB16_LPC_VEC_PER_FRAME);
break;
}
default:
return -1;
}
if (err<0) // error check
{
return err;
}
WebRtcIsac_DequantizeLpcParam(index_s, lpcVecs, bandwidth);
WebRtcIsac_CorrelateInterVec(lpcVecs, U, bandwidth);
WebRtcIsac_CorrelateIntraVec(U, lpcVecs, bandwidth);
WebRtcIsac_AddLarMean(lpcVecs, bandwidth);
WebRtcIsac_DecodeLpcGainUb(percepFilterGains, streamdata);
if(bandwidth == isac16kHz)
{
// decode another set of Gains
WebRtcIsac_DecodeLpcGainUb(&percepFilterGains[SUBFRAMES], streamdata);
}
return 0;
}
WebRtc_Word16
WebRtcIsac_EncodeBandwidth(
enum ISACBandwidth bandwidth,
Bitstr* streamData)
{
int bandwidthMode;
switch(bandwidth)
{
case isac12kHz:
{
bandwidthMode = 0;
break;
}
case isac16kHz:
{
bandwidthMode = 1;
break;
}
default:
return -ISAC_DISALLOWED_ENCODER_BANDWIDTH;
}
WebRtcIsac_EncHistMulti(streamData, &bandwidthMode,
kOneBitEqualProbCdf_ptr, 1);
return 0;
}
WebRtc_Word16
WebRtcIsac_DecodeBandwidth(
Bitstr* streamData,
enum ISACBandwidth* bandwidth)
{
int bandwidthMode;
if(WebRtcIsac_DecHistOneStepMulti(&bandwidthMode, streamData,
kOneBitEqualProbCdf_ptr,
kOneBitEqualProbInitIndex, 1) < 0)
{
// error check
return -ISAC_RANGE_ERROR_DECODE_BANDWITH;
}
switch(bandwidthMode)
{
case 0:
{
*bandwidth = isac12kHz;
break;
}
case 1:
{
*bandwidth = isac16kHz;
break;
}
default:
return -ISAC_DISALLOWED_BANDWIDTH_MODE_DECODER;
}
return 0;
}
WebRtc_Word16
WebRtcIsac_EncodeJitterInfo(
WebRtc_Word32 jitterIndex,
Bitstr* streamData)
{
// This is to avoid LINUX warning until we change 'int' to
// 'Word32'
int intVar;
if((jitterIndex < 0) || (jitterIndex > 1))
{
return -1;
}
intVar = (int)(jitterIndex);
// Use the same CDF table as for bandwidth
// both take two values with equal probability
WebRtcIsac_EncHistMulti(streamData, &intVar,
kOneBitEqualProbCdf_ptr, 1);
return 0;
}
WebRtc_Word16
WebRtcIsac_DecodeJitterInfo(
Bitstr* streamData,
WebRtc_Word32* jitterInfo)
{
int intVar;
// Use the same CDF table as for bandwidth
// both take two values with equal probability
if(WebRtcIsac_DecHistOneStepMulti(&intVar, streamData,
kOneBitEqualProbCdf_ptr,
kOneBitEqualProbInitIndex, 1) < 0)
{
// error check
return -ISAC_RANGE_ERROR_DECODE_BANDWITH;
}
*jitterInfo = (WebRtc_Word16)(intVar);
return 0;
}