ref: 5d7b03669cb067c8848dfad642357c86e46e806a
dir: /silk/float/silk_find_LTP_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. ***********************************************************************/ #include "silk_main_FLP.h" #include "silk_tuning_parameters.h" void silk_find_LTP_FLP( SKP_float b[ MAX_NB_SUBFR * LTP_ORDER ], /* O LTP coefs */ SKP_float WLTP[ MAX_NB_SUBFR * LTP_ORDER * LTP_ORDER ], /* O Weight for LTP quantization */ SKP_float *LTPredCodGain, /* O LTP coding gain */ const SKP_float r_lpc[], /* I LPC residual */ const SKP_int lag[ MAX_NB_SUBFR ], /* I LTP lags */ const SKP_float Wght[ MAX_NB_SUBFR ], /* I Weights */ const SKP_int subfr_length, /* I Subframe length */ const SKP_int nb_subfr, /* I number of subframes */ const SKP_int mem_offset /* I Number of samples in LTP memory */ ) { SKP_int i, k; SKP_float *b_ptr, temp, *WLTP_ptr; SKP_float LPC_res_nrg, LPC_LTP_res_nrg; SKP_float d[ MAX_NB_SUBFR ], m, g, delta_b[ LTP_ORDER ]; SKP_float w[ MAX_NB_SUBFR ], nrg[ MAX_NB_SUBFR ], regu; SKP_float Rr[ LTP_ORDER ], rr[ MAX_NB_SUBFR ]; const SKP_float *r_ptr, *lag_ptr; b_ptr = b; WLTP_ptr = WLTP; r_ptr = &r_lpc[ mem_offset ]; for( k = 0; k < nb_subfr; k++ ) { lag_ptr = r_ptr - ( lag[ k ] + LTP_ORDER / 2 ); silk_corrMatrix_FLP( lag_ptr, subfr_length, LTP_ORDER, WLTP_ptr ); silk_corrVector_FLP( lag_ptr, r_ptr, subfr_length, LTP_ORDER, Rr ); rr[ k ] = ( SKP_float )silk_energy_FLP( r_ptr, subfr_length ); regu = 1.0f + rr[ k ] + matrix_ptr( WLTP_ptr, 0, 0, LTP_ORDER ) + matrix_ptr( WLTP_ptr, LTP_ORDER-1, LTP_ORDER-1, LTP_ORDER ); regu *= LTP_DAMPING / 3; silk_regularize_correlations_FLP( WLTP_ptr, &rr[ k ], regu, LTP_ORDER ); silk_solve_LDL_FLP( WLTP_ptr, LTP_ORDER, Rr, b_ptr ); /* Calculate residual energy */ nrg[ k ] = silk_residual_energy_covar_FLP( b_ptr, WLTP_ptr, Rr, rr[ k ], LTP_ORDER ); temp = Wght[ k ] / ( nrg[ k ] * Wght[ k ] + 0.01f * subfr_length ); silk_scale_vector_FLP( WLTP_ptr, temp, LTP_ORDER * LTP_ORDER ); w[ k ] = matrix_ptr( WLTP_ptr, LTP_ORDER / 2, LTP_ORDER / 2, LTP_ORDER ); r_ptr += subfr_length; b_ptr += LTP_ORDER; WLTP_ptr += LTP_ORDER * LTP_ORDER; } /* Compute LTP coding gain */ if( LTPredCodGain != NULL ) { LPC_LTP_res_nrg = 1e-6f; LPC_res_nrg = 0.0f; for( k = 0; k < nb_subfr; k++ ) { LPC_res_nrg += rr[ k ] * Wght[ k ]; LPC_LTP_res_nrg += nrg[ k ] * Wght[ k ]; } SKP_assert( LPC_LTP_res_nrg > 0 ); *LTPredCodGain = 3.0f * silk_log2( LPC_res_nrg / LPC_LTP_res_nrg ); } /* Smoothing */ /* d = sum( B, 1 ); */ b_ptr = b; for( k = 0; k < nb_subfr; k++ ) { d[ k ] = 0; for( i = 0; i < LTP_ORDER; i++ ) { d[ k ] += b_ptr[ i ]; } b_ptr += LTP_ORDER; } /* m = ( w * d' ) / ( sum( w ) + 1e-3 ); */ temp = 1e-3f; for( k = 0; k < nb_subfr; k++ ) { temp += w[ k ]; } m = 0; for( k = 0; k < nb_subfr; k++ ) { m += d[ k ] * w[ k ]; } m = m / temp; b_ptr = b; for( k = 0; k < nb_subfr; k++ ) { g = LTP_SMOOTHING / ( LTP_SMOOTHING + w[ k ] ) * ( m - d[ k ] ); temp = 0; for( i = 0; i < LTP_ORDER; i++ ) { delta_b[ i ] = SKP_max_float( b_ptr[ i ], 0.1f ); temp += delta_b[ i ]; } temp = g / temp; for( i = 0; i < LTP_ORDER; i++ ) { b_ptr[ i ] = b_ptr[ i ] + delta_b[ i ] * temp; } b_ptr += LTP_ORDER; } }