michael@0: /*********************************************************************** michael@0: Copyright (c) 2006-2011, Skype Limited. All rights reserved. michael@0: Redistribution and use in source and binary forms, with or without michael@0: modification, are permitted provided that the following conditions michael@0: are met: michael@0: - Redistributions of source code must retain the above copyright notice, michael@0: this list of conditions and the following disclaimer. michael@0: - Redistributions in binary form must reproduce the above copyright michael@0: notice, this list of conditions and the following disclaimer in the michael@0: documentation and/or other materials provided with the distribution. michael@0: - Neither the name of Internet Society, IETF or IETF Trust, nor the michael@0: names of specific contributors, may be used to endorse or promote michael@0: products derived from this software without specific prior written michael@0: permission. michael@0: THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" michael@0: AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE michael@0: IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE michael@0: ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE michael@0: LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR michael@0: CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF michael@0: SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS michael@0: INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN michael@0: CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) michael@0: ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE michael@0: POSSIBILITY OF SUCH DAMAGE. michael@0: ***********************************************************************/ michael@0: michael@0: #ifdef HAVE_CONFIG_H michael@0: #include "config.h" michael@0: #endif michael@0: michael@0: #include "main_FLP.h" michael@0: michael@0: #define MAX_ITERATIONS_RESIDUAL_NRG 10 michael@0: #define REGULARIZATION_FACTOR 1e-8f michael@0: michael@0: /* Residual energy: nrg = wxx - 2 * wXx * c + c' * wXX * c */ michael@0: silk_float silk_residual_energy_covar_FLP( /* O Weighted residual energy */ michael@0: const silk_float *c, /* I Filter coefficients */ michael@0: silk_float *wXX, /* I/O Weighted correlation matrix, reg. out */ michael@0: const silk_float *wXx, /* I Weighted correlation vector */ michael@0: const silk_float wxx, /* I Weighted correlation value */ michael@0: const opus_int D /* I Dimension */ michael@0: ) michael@0: { michael@0: opus_int i, j, k; michael@0: silk_float tmp, nrg = 0.0f, regularization; michael@0: michael@0: /* Safety checks */ michael@0: silk_assert( D >= 0 ); michael@0: michael@0: regularization = REGULARIZATION_FACTOR * ( wXX[ 0 ] + wXX[ D * D - 1 ] ); michael@0: for( k = 0; k < MAX_ITERATIONS_RESIDUAL_NRG; k++ ) { michael@0: nrg = wxx; michael@0: michael@0: tmp = 0.0f; michael@0: for( i = 0; i < D; i++ ) { michael@0: tmp += wXx[ i ] * c[ i ]; michael@0: } michael@0: nrg -= 2.0f * tmp; michael@0: michael@0: /* compute c' * wXX * c, assuming wXX is symmetric */ michael@0: for( i = 0; i < D; i++ ) { michael@0: tmp = 0.0f; michael@0: for( j = i + 1; j < D; j++ ) { michael@0: tmp += matrix_c_ptr( wXX, i, j, D ) * c[ j ]; michael@0: } michael@0: nrg += c[ i ] * ( 2.0f * tmp + matrix_c_ptr( wXX, i, i, D ) * c[ i ] ); michael@0: } michael@0: if( nrg > 0 ) { michael@0: break; michael@0: } else { michael@0: /* Add white noise */ michael@0: for( i = 0; i < D; i++ ) { michael@0: matrix_c_ptr( wXX, i, i, D ) += regularization; michael@0: } michael@0: /* Increase noise for next run */ michael@0: regularization *= 2.0f; michael@0: } michael@0: } michael@0: if( k == MAX_ITERATIONS_RESIDUAL_NRG ) { michael@0: silk_assert( nrg == 0 ); michael@0: nrg = 1.0f; michael@0: } michael@0: michael@0: return nrg; michael@0: } michael@0: michael@0: /* Calculates residual energies of input subframes where all subframes have LPC_order */ michael@0: /* of preceding samples */ michael@0: void silk_residual_energy_FLP( michael@0: silk_float nrgs[ MAX_NB_SUBFR ], /* O Residual energy per subframe */ michael@0: const silk_float x[], /* I Input signal */ michael@0: silk_float a[ 2 ][ MAX_LPC_ORDER ], /* I AR coefs for each frame half */ michael@0: const silk_float gains[], /* I Quantization gains */ michael@0: const opus_int subfr_length, /* I Subframe length */ michael@0: const opus_int nb_subfr, /* I number of subframes */ michael@0: const opus_int LPC_order /* I LPC order */ michael@0: ) michael@0: { michael@0: opus_int shift; michael@0: silk_float *LPC_res_ptr, LPC_res[ ( MAX_FRAME_LENGTH + MAX_NB_SUBFR * MAX_LPC_ORDER ) / 2 ]; michael@0: michael@0: LPC_res_ptr = LPC_res + LPC_order; michael@0: shift = LPC_order + subfr_length; michael@0: michael@0: /* Filter input to create the LPC residual for each frame half, and measure subframe energies */ michael@0: silk_LPC_analysis_filter_FLP( LPC_res, a[ 0 ], x + 0 * shift, 2 * shift, LPC_order ); michael@0: nrgs[ 0 ] = ( silk_float )( gains[ 0 ] * gains[ 0 ] * silk_energy_FLP( LPC_res_ptr + 0 * shift, subfr_length ) ); michael@0: nrgs[ 1 ] = ( silk_float )( gains[ 1 ] * gains[ 1 ] * silk_energy_FLP( LPC_res_ptr + 1 * shift, subfr_length ) ); michael@0: michael@0: if( nb_subfr == MAX_NB_SUBFR ) { michael@0: silk_LPC_analysis_filter_FLP( LPC_res, a[ 1 ], x + 2 * shift, 2 * shift, LPC_order ); michael@0: nrgs[ 2 ] = ( silk_float )( gains[ 2 ] * gains[ 2 ] * silk_energy_FLP( LPC_res_ptr + 0 * shift, subfr_length ) ); michael@0: nrgs[ 3 ] = ( silk_float )( gains[ 3 ] * gains[ 3 ] * silk_energy_FLP( LPC_res_ptr + 1 * shift, subfr_length ) ); michael@0: } michael@0: }