cannam@154: /*********************************************************************** cannam@154: Copyright (c) 2006-2011, Skype Limited. All rights reserved. cannam@154: Redistribution and use in source and binary forms, with or without cannam@154: modification, are permitted provided that the following conditions cannam@154: are met: cannam@154: - Redistributions of source code must retain the above copyright notice, cannam@154: this list of conditions and the following disclaimer. cannam@154: - Redistributions in binary form must reproduce the above copyright cannam@154: notice, this list of conditions and the following disclaimer in the cannam@154: documentation and/or other materials provided with the distribution. cannam@154: - Neither the name of Internet Society, IETF or IETF Trust, nor the cannam@154: names of specific contributors, may be used to endorse or promote cannam@154: products derived from this software without specific prior written cannam@154: permission. cannam@154: THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" cannam@154: AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE cannam@154: IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE cannam@154: ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE cannam@154: LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR cannam@154: CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF cannam@154: SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS cannam@154: INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN cannam@154: CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) cannam@154: ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE cannam@154: POSSIBILITY OF SUCH DAMAGE. cannam@154: ***********************************************************************/ cannam@154: cannam@154: #ifdef HAVE_CONFIG_H cannam@154: #include "config.h" cannam@154: #endif cannam@154: cannam@154: #include "main_FLP.h" cannam@154: cannam@154: #define MAX_ITERATIONS_RESIDUAL_NRG 10 cannam@154: #define REGULARIZATION_FACTOR 1e-8f cannam@154: cannam@154: /* Residual energy: nrg = wxx - 2 * wXx * c + c' * wXX * c */ cannam@154: silk_float silk_residual_energy_covar_FLP( /* O Weighted residual energy */ cannam@154: const silk_float *c, /* I Filter coefficients */ cannam@154: silk_float *wXX, /* I/O Weighted correlation matrix, reg. out */ cannam@154: const silk_float *wXx, /* I Weighted correlation vector */ cannam@154: const silk_float wxx, /* I Weighted correlation value */ cannam@154: const opus_int D /* I Dimension */ cannam@154: ) cannam@154: { cannam@154: opus_int i, j, k; cannam@154: silk_float tmp, nrg = 0.0f, regularization; cannam@154: cannam@154: /* Safety checks */ cannam@154: celt_assert( D >= 0 ); cannam@154: cannam@154: regularization = REGULARIZATION_FACTOR * ( wXX[ 0 ] + wXX[ D * D - 1 ] ); cannam@154: for( k = 0; k < MAX_ITERATIONS_RESIDUAL_NRG; k++ ) { cannam@154: nrg = wxx; cannam@154: cannam@154: tmp = 0.0f; cannam@154: for( i = 0; i < D; i++ ) { cannam@154: tmp += wXx[ i ] * c[ i ]; cannam@154: } cannam@154: nrg -= 2.0f * tmp; cannam@154: cannam@154: /* compute c' * wXX * c, assuming wXX is symmetric */ cannam@154: for( i = 0; i < D; i++ ) { cannam@154: tmp = 0.0f; cannam@154: for( j = i + 1; j < D; j++ ) { cannam@154: tmp += matrix_c_ptr( wXX, i, j, D ) * c[ j ]; cannam@154: } cannam@154: nrg += c[ i ] * ( 2.0f * tmp + matrix_c_ptr( wXX, i, i, D ) * c[ i ] ); cannam@154: } cannam@154: if( nrg > 0 ) { cannam@154: break; cannam@154: } else { cannam@154: /* Add white noise */ cannam@154: for( i = 0; i < D; i++ ) { cannam@154: matrix_c_ptr( wXX, i, i, D ) += regularization; cannam@154: } cannam@154: /* Increase noise for next run */ cannam@154: regularization *= 2.0f; cannam@154: } cannam@154: } cannam@154: if( k == MAX_ITERATIONS_RESIDUAL_NRG ) { cannam@154: silk_assert( nrg == 0 ); cannam@154: nrg = 1.0f; cannam@154: } cannam@154: cannam@154: return nrg; cannam@154: } cannam@154: cannam@154: /* Calculates residual energies of input subframes where all subframes have LPC_order */ cannam@154: /* of preceding samples */ cannam@154: void silk_residual_energy_FLP( cannam@154: silk_float nrgs[ MAX_NB_SUBFR ], /* O Residual energy per subframe */ cannam@154: const silk_float x[], /* I Input signal */ cannam@154: silk_float a[ 2 ][ MAX_LPC_ORDER ], /* I AR coefs for each frame half */ cannam@154: const silk_float gains[], /* I Quantization gains */ cannam@154: const opus_int subfr_length, /* I Subframe length */ cannam@154: const opus_int nb_subfr, /* I number of subframes */ cannam@154: const opus_int LPC_order /* I LPC order */ cannam@154: ) cannam@154: { cannam@154: opus_int shift; cannam@154: silk_float *LPC_res_ptr, LPC_res[ ( MAX_FRAME_LENGTH + MAX_NB_SUBFR * MAX_LPC_ORDER ) / 2 ]; cannam@154: cannam@154: LPC_res_ptr = LPC_res + LPC_order; cannam@154: shift = LPC_order + subfr_length; cannam@154: cannam@154: /* Filter input to create the LPC residual for each frame half, and measure subframe energies */ cannam@154: silk_LPC_analysis_filter_FLP( LPC_res, a[ 0 ], x + 0 * shift, 2 * shift, LPC_order ); cannam@154: nrgs[ 0 ] = ( silk_float )( gains[ 0 ] * gains[ 0 ] * silk_energy_FLP( LPC_res_ptr + 0 * shift, subfr_length ) ); cannam@154: nrgs[ 1 ] = ( silk_float )( gains[ 1 ] * gains[ 1 ] * silk_energy_FLP( LPC_res_ptr + 1 * shift, subfr_length ) ); cannam@154: cannam@154: if( nb_subfr == MAX_NB_SUBFR ) { cannam@154: silk_LPC_analysis_filter_FLP( LPC_res, a[ 1 ], x + 2 * shift, 2 * shift, LPC_order ); cannam@154: nrgs[ 2 ] = ( silk_float )( gains[ 2 ] * gains[ 2 ] * silk_energy_FLP( LPC_res_ptr + 0 * shift, subfr_length ) ); cannam@154: nrgs[ 3 ] = ( silk_float )( gains[ 3 ] * gains[ 3 ] * silk_energy_FLP( LPC_res_ptr + 1 * shift, subfr_length ) ); cannam@154: } cannam@154: }