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/***********************************************************************
Copyright (c) 2006-2011, Skype Limited. All rights reserved.
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modification, are permitted provided that the following conditions
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names of specific contributors, may be used to endorse or promote
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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***********************************************************************/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "main_FLP.h"
#include "tuning_parameters.h"
/*
* Prefilter for finding Quantizer input signal
*/
static OPUS_INLINE void silk_prefilt_FLP(
silk_prefilter_state_FLP *P, /* I/O state */
silk_float st_res[], /* I */
silk_float xw[], /* O */
silk_float *HarmShapeFIR, /* I */
silk_float Tilt, /* I */
silk_float LF_MA_shp, /* I */
silk_float LF_AR_shp, /* I */
opus_int lag, /* I */
opus_int length /* I */
);
static void silk_warped_LPC_analysis_filter_FLP(
silk_float state[], /* I/O State [order + 1] */
silk_float res[], /* O Residual signal [length] */
const silk_float coef[], /* I Coefficients [order] */
const silk_float input[], /* I Input signal [length] */
const silk_float lambda, /* I Warping factor */
const opus_int length, /* I Length of input signal */
const opus_int order /* I Filter order (even) */
)
{
opus_int n, i;
silk_float acc, tmp1, tmp2;
/* Order must be even */
silk_assert( ( order & 1 ) == 0 );
for( n = 0; n < length; n++ ) {
/* Output of lowpass section */
tmp2 = state[ 0 ] + lambda * state[ 1 ];
state[ 0 ] = input[ n ];
/* Output of allpass section */
tmp1 = state[ 1 ] + lambda * ( state[ 2 ] - tmp2 );
state[ 1 ] = tmp2;
acc = coef[ 0 ] * tmp2;
/* Loop over allpass sections */
for( i = 2; i < order; i += 2 ) {
/* Output of allpass section */
tmp2 = state[ i ] + lambda * ( state[ i + 1 ] - tmp1 );
state[ i ] = tmp1;
acc += coef[ i - 1 ] * tmp1;
/* Output of allpass section */
tmp1 = state[ i + 1 ] + lambda * ( state[ i + 2 ] - tmp2 );
state[ i + 1 ] = tmp2;
acc += coef[ i ] * tmp2;
}
state[ order ] = tmp1;
acc += coef[ order - 1 ] * tmp1;
res[ n ] = input[ n ] - acc;
}
}
/*
* silk_prefilter. Main prefilter function
*/
void silk_prefilter_FLP(
silk_encoder_state_FLP *psEnc, /* I/O Encoder state FLP */
const silk_encoder_control_FLP *psEncCtrl, /* I Encoder control FLP */
silk_float xw[], /* O Weighted signal */
const silk_float x[] /* I Speech signal */
)
{
silk_prefilter_state_FLP *P = &psEnc->sPrefilt;
opus_int j, k, lag;
silk_float HarmShapeGain, Tilt, LF_MA_shp, LF_AR_shp;
silk_float B[ 2 ];
const silk_float *AR1_shp;
const silk_float *px;
silk_float *pxw;
silk_float HarmShapeFIR[ 3 ];
silk_float st_res[ MAX_SUB_FRAME_LENGTH + MAX_LPC_ORDER ];
/* Set up pointers */
px = x;
pxw = xw;
lag = P->lagPrev;
for( k = 0; k < psEnc->sCmn.nb_subfr; k++ ) {
/* Update Variables that change per sub frame */
if( psEnc->sCmn.indices.signalType == TYPE_VOICED ) {
lag = psEncCtrl->pitchL[ k ];
}
/* Noise shape parameters */
HarmShapeGain = psEncCtrl->HarmShapeGain[ k ] * ( 1.0f - psEncCtrl->HarmBoost[ k ] );
HarmShapeFIR[ 0 ] = 0.25f * HarmShapeGain;
HarmShapeFIR[ 1 ] = 32767.0f / 65536.0f * HarmShapeGain;
HarmShapeFIR[ 2 ] = 0.25f * HarmShapeGain;
Tilt = psEncCtrl->Tilt[ k ];
LF_MA_shp = psEncCtrl->LF_MA_shp[ k ];
LF_AR_shp = psEncCtrl->LF_AR_shp[ k ];
AR1_shp = &psEncCtrl->AR1[ k * MAX_SHAPE_LPC_ORDER ];
/* Short term FIR filtering */
silk_warped_LPC_analysis_filter_FLP( P->sAR_shp, st_res, AR1_shp, px,
(silk_float)psEnc->sCmn.warping_Q16 / 65536.0f, psEnc->sCmn.subfr_length, psEnc->sCmn.shapingLPCOrder );
/* Reduce (mainly) low frequencies during harmonic emphasis */
B[ 0 ] = psEncCtrl->GainsPre[ k ];
B[ 1 ] = -psEncCtrl->GainsPre[ k ] *
( psEncCtrl->HarmBoost[ k ] * HarmShapeGain + INPUT_TILT + psEncCtrl->coding_quality * HIGH_RATE_INPUT_TILT );
pxw[ 0 ] = B[ 0 ] * st_res[ 0 ] + B[ 1 ] * P->sHarmHP;
for( j = 1; j < psEnc->sCmn.subfr_length; j++ ) {
pxw[ j ] = B[ 0 ] * st_res[ j ] + B[ 1 ] * st_res[ j - 1 ];
}
P->sHarmHP = st_res[ psEnc->sCmn.subfr_length - 1 ];
silk_prefilt_FLP( P, pxw, pxw, HarmShapeFIR, Tilt, LF_MA_shp, LF_AR_shp, lag, psEnc->sCmn.subfr_length );
px += psEnc->sCmn.subfr_length;
pxw += psEnc->sCmn.subfr_length;
}
P->lagPrev = psEncCtrl->pitchL[ psEnc->sCmn.nb_subfr - 1 ];
}
/*
* Prefilter for finding Quantizer input signal
*/
static OPUS_INLINE void silk_prefilt_FLP(
silk_prefilter_state_FLP *P, /* I/O state */
silk_float st_res[], /* I */
silk_float xw[], /* O */
silk_float *HarmShapeFIR, /* I */
silk_float Tilt, /* I */
silk_float LF_MA_shp, /* I */
silk_float LF_AR_shp, /* I */
opus_int lag, /* I */
opus_int length /* I */
)
{
opus_int i;
opus_int idx, LTP_shp_buf_idx;
silk_float n_Tilt, n_LF, n_LTP;
silk_float sLF_AR_shp, sLF_MA_shp;
silk_float *LTP_shp_buf;
/* To speed up use temp variables instead of using the struct */
LTP_shp_buf = P->sLTP_shp;
LTP_shp_buf_idx = P->sLTP_shp_buf_idx;
sLF_AR_shp = P->sLF_AR_shp;
sLF_MA_shp = P->sLF_MA_shp;
for( i = 0; i < length; i++ ) {
if( lag > 0 ) {
silk_assert( HARM_SHAPE_FIR_TAPS == 3 );
idx = lag + LTP_shp_buf_idx;
n_LTP = LTP_shp_buf[ ( idx - HARM_SHAPE_FIR_TAPS / 2 - 1) & LTP_MASK ] * HarmShapeFIR[ 0 ];
n_LTP += LTP_shp_buf[ ( idx - HARM_SHAPE_FIR_TAPS / 2 ) & LTP_MASK ] * HarmShapeFIR[ 1 ];
n_LTP += LTP_shp_buf[ ( idx - HARM_SHAPE_FIR_TAPS / 2 + 1) & LTP_MASK ] * HarmShapeFIR[ 2 ];
} else {
n_LTP = 0;
}
n_Tilt = sLF_AR_shp * Tilt;
n_LF = sLF_AR_shp * LF_AR_shp + sLF_MA_shp * LF_MA_shp;
sLF_AR_shp = st_res[ i ] - n_Tilt;
sLF_MA_shp = sLF_AR_shp - n_LF;
LTP_shp_buf_idx = ( LTP_shp_buf_idx - 1 ) & LTP_MASK;
LTP_shp_buf[ LTP_shp_buf_idx ] = sLF_MA_shp;
xw[ i ] = sLF_MA_shp - n_LTP;
}
/* Copy temp variable back to state */
P->sLF_AR_shp = sLF_AR_shp;
P->sLF_MA_shp = sLF_MA_shp;
P->sLTP_shp_buf_idx = LTP_shp_buf_idx;
}