aboutsummaryrefslogtreecommitdiff
path: root/silk/float/prefilter_FLP.c
diff options
context:
space:
mode:
Diffstat (limited to 'silk/float/prefilter_FLP.c')
-rw-r--r--silk/float/prefilter_FLP.c206
1 files changed, 0 insertions, 206 deletions
diff --git a/silk/float/prefilter_FLP.c b/silk/float/prefilter_FLP.c
deleted file mode 100644
index 8bc32fb4..00000000
--- a/silk/float/prefilter_FLP.c
+++ /dev/null
@@ -1,206 +0,0 @@
-/***********************************************************************
-Copyright (c) 2006-2011, Skype Limited. All rights reserved.
-Redistribution and use in source and binary forms, with or without
-modification, 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 Internet Society, IETF or IETF Trust, nor the
-names of specific contributors, may be used to endorse or promote
-products derived from this software without specific prior written
-permission.
-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"
-
-/*
-* 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;
-}
generated by cgit v1.2.3 (git 2.25.1) at 2024-07-09 06:57:23 +0000