ref: 828e33f304e99321a7990752aeb97616399bfbcc
dir: /silk/float/prefilter_FLP.c/
/*********************************************************************** Copyright (c) 2006-2011, Skype Limited. All rights reserved. Redistribution and use in source and binary forms, with or without modification, (subject to the limitations in the disclaimer below) are permitted provided that the following conditions are met: - Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer. - Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution. - Neither the name of Skype Limited, nor the names of specific contributors, may be used to endorse or promote products derived from this software without specific prior written permission. NO EXPRESS OR IMPLIED LICENSES TO ANY PARTY'S PATENT RIGHTS ARE GRANTED BY THIS LICENSE. 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 CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. ***********************************************************************/ #ifdef HAVE_CONFIG_H #include "config.h" #endif #include "main_FLP.h" #include "tuning_parameters.h" /* * silk_prefilter. Prefilter for finding Quantizer input signal */ static 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 */ ); 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 ]; /* Setup 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 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; }