130 lines
5.7 KiB
C
130 lines
5.7 KiB
C
/***********************************************************************
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Copyright (c) 2006-2011, Skype Limited. All rights reserved.
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions
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are met:
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- Redistributions of source code must retain the above copyright notice,
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this list of conditions and the following disclaimer.
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- Redistributions in binary form must reproduce the above copyright
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notice, this list of conditions and the following disclaimer in the
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documentation and/or other materials provided with the distribution.
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- Neither the name of Internet Society, IETF or IETF Trust, nor the
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names of specific contributors, may be used to endorse or promote
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products derived from this software without specific prior written
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permission.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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POSSIBILITY OF SUCH DAMAGE.
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***********************************************************************/
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#include "opus/opus_config.h"
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#include "opus/silk/float/main_FLP.h"
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#include "opus/silk/tuning_parameters.h"
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void silk_find_LTP_FLP(
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silk_float b[ MAX_NB_SUBFR * LTP_ORDER ], /* O LTP coefs */
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silk_float WLTP[ MAX_NB_SUBFR * LTP_ORDER * LTP_ORDER ], /* O Weight for LTP quantization */
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silk_float *LTPredCodGain, /* O LTP coding gain */
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const silk_float r_lpc[], /* I LPC residual */
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const opus_int lag[ MAX_NB_SUBFR ], /* I LTP lags */
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const silk_float Wght[ MAX_NB_SUBFR ], /* I Weights */
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const opus_int subfr_length, /* I Subframe length */
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const opus_int nb_subfr, /* I number of subframes */
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const opus_int mem_offset /* I Number of samples in LTP memory */
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)
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{
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opus_int i, k;
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silk_float *b_ptr, temp, *WLTP_ptr;
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silk_float LPC_res_nrg, LPC_LTP_res_nrg;
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silk_float d[ MAX_NB_SUBFR ], m, g, delta_b[ LTP_ORDER ];
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silk_float w[ MAX_NB_SUBFR ], nrg[ MAX_NB_SUBFR ], regu;
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silk_float Rr[ LTP_ORDER ], rr[ MAX_NB_SUBFR ];
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const silk_float *r_ptr, *lag_ptr;
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b_ptr = b;
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WLTP_ptr = WLTP;
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r_ptr = &r_lpc[ mem_offset ];
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for( k = 0; k < nb_subfr; k++ ) {
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lag_ptr = r_ptr - ( lag[ k ] + LTP_ORDER / 2 );
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silk_corrMatrix_FLP( lag_ptr, subfr_length, LTP_ORDER, WLTP_ptr );
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silk_corrVector_FLP( lag_ptr, r_ptr, subfr_length, LTP_ORDER, Rr );
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rr[ k ] = ( silk_float )silk_energy_FLP( r_ptr, subfr_length );
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regu = 1.0f + rr[ k ] +
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matrix_ptr( WLTP_ptr, 0, 0, LTP_ORDER ) +
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matrix_ptr( WLTP_ptr, LTP_ORDER-1, LTP_ORDER-1, LTP_ORDER );
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regu *= LTP_DAMPING / 3;
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silk_regularize_correlations_FLP( WLTP_ptr, &rr[ k ], regu, LTP_ORDER );
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silk_solve_LDL_FLP( WLTP_ptr, LTP_ORDER, Rr, b_ptr );
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/* Calculate residual energy */
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nrg[ k ] = silk_residual_energy_covar_FLP( b_ptr, WLTP_ptr, Rr, rr[ k ], LTP_ORDER );
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temp = Wght[ k ] / ( nrg[ k ] * Wght[ k ] + 0.01f * subfr_length );
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silk_scale_vector_FLP( WLTP_ptr, temp, LTP_ORDER * LTP_ORDER );
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w[ k ] = matrix_ptr( WLTP_ptr, LTP_ORDER / 2, LTP_ORDER / 2, LTP_ORDER );
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r_ptr += subfr_length;
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b_ptr += LTP_ORDER;
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WLTP_ptr += LTP_ORDER * LTP_ORDER;
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}
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/* Compute LTP coding gain */
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if( LTPredCodGain != NULL ) {
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LPC_LTP_res_nrg = 1e-6f;
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LPC_res_nrg = 0.0f;
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for( k = 0; k < nb_subfr; k++ ) {
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LPC_res_nrg += rr[ k ] * Wght[ k ];
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LPC_LTP_res_nrg += nrg[ k ] * Wght[ k ];
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}
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silk_assert( LPC_LTP_res_nrg > 0 );
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*LTPredCodGain = 3.0f * silk_log2( LPC_res_nrg / LPC_LTP_res_nrg );
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}
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/* Smoothing */
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/* d = sum( B, 1 ); */
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b_ptr = b;
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for( k = 0; k < nb_subfr; k++ ) {
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d[ k ] = 0;
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for( i = 0; i < LTP_ORDER; i++ ) {
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d[ k ] += b_ptr[ i ];
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}
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b_ptr += LTP_ORDER;
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}
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/* m = ( w * d' ) / ( sum( w ) + 1e-3 ); */
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temp = 1e-3f;
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for( k = 0; k < nb_subfr; k++ ) {
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temp += w[ k ];
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}
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m = 0;
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for( k = 0; k < nb_subfr; k++ ) {
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m += d[ k ] * w[ k ];
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}
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m = m / temp;
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b_ptr = b;
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for( k = 0; k < nb_subfr; k++ ) {
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g = LTP_SMOOTHING / ( LTP_SMOOTHING + w[ k ] ) * ( m - d[ k ] );
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temp = 0;
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for( i = 0; i < LTP_ORDER; i++ ) {
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delta_b[ i ] = silk_max_float( b_ptr[ i ], 0.1f );
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temp += delta_b[ i ];
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}
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temp = g / temp;
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for( i = 0; i < LTP_ORDER; i++ ) {
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b_ptr[ i ] = b_ptr[ i ] + delta_b[ i ] * temp;
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}
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b_ptr += LTP_ORDER;
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}
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}
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