1885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org/*********************************************************************** 2885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.orgCopyright (c) 2006-2011, Skype Limited. All rights reserved. 3885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.orgRedistribution and use in source and binary forms, with or without 4885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.orgmodification, are permitted provided that the following conditions 5885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.orgare met: 6885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org- Redistributions of source code must retain the above copyright notice, 7885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.orgthis list of conditions and the following disclaimer. 8885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org- Redistributions in binary form must reproduce the above copyright 9885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.orgnotice, this list of conditions and the following disclaimer in the 10885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.orgdocumentation and/or other materials provided with the distribution. 11e3ea049fcaee2247e45f0ce793d4313babb4ef69tlegrand@chromium.org- Neither the name of Internet Society, IETF or IETF Trust, nor the 12885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.orgnames of specific contributors, may be used to endorse or promote 13885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.orgproducts derived from this software without specific prior written 14885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.orgpermission. 15e3ea049fcaee2247e45f0ce793d4313babb4ef69tlegrand@chromium.orgTHIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" 16885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.orgAND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 17885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.orgIMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 18885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.orgARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE 19885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.orgLIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 20885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.orgCONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 21885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.orgSUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 22885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.orgINTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 23885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.orgCONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 24885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.orgARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 25885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.orgPOSSIBILITY OF SUCH DAMAGE. 26885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org***********************************************************************/ 27885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org 28885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org#ifdef HAVE_CONFIG_H 29885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org#include "config.h" 30885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org#endif 31885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org 32885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org#include "main_FLP.h" 33885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org 34885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org#define MAX_ITERATIONS_RESIDUAL_NRG 10 35885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org#define REGULARIZATION_FACTOR 1e-8f 36885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org 37885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org/* Residual energy: nrg = wxx - 2 * wXx * c + c' * wXX * c */ 38885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.orgsilk_float silk_residual_energy_covar_FLP( /* O Weighted residual energy */ 39885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org const silk_float *c, /* I Filter coefficients */ 40885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org silk_float *wXX, /* I/O Weighted correlation matrix, reg. out */ 41885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org const silk_float *wXx, /* I Weighted correlation vector */ 42885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org const silk_float wxx, /* I Weighted correlation value */ 43885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org const opus_int D /* I Dimension */ 44885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org) 45885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org{ 46885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org opus_int i, j, k; 47885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org silk_float tmp, nrg = 0.0f, regularization; 48885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org 49885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org /* Safety checks */ 50885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org silk_assert( D >= 0 ); 51885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org 52885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org regularization = REGULARIZATION_FACTOR * ( wXX[ 0 ] + wXX[ D * D - 1 ] ); 53885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org for( k = 0; k < MAX_ITERATIONS_RESIDUAL_NRG; k++ ) { 54885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org nrg = wxx; 55885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org 56885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org tmp = 0.0f; 57885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org for( i = 0; i < D; i++ ) { 58885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org tmp += wXx[ i ] * c[ i ]; 59885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org } 60885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org nrg -= 2.0f * tmp; 61885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org 62885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org /* compute c' * wXX * c, assuming wXX is symmetric */ 63885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org for( i = 0; i < D; i++ ) { 64885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org tmp = 0.0f; 65885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org for( j = i + 1; j < D; j++ ) { 66885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org tmp += matrix_c_ptr( wXX, i, j, D ) * c[ j ]; 67885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org } 68885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org nrg += c[ i ] * ( 2.0f * tmp + matrix_c_ptr( wXX, i, i, D ) * c[ i ] ); 69885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org } 70885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org if( nrg > 0 ) { 71885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org break; 72885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org } else { 73885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org /* Add white noise */ 74885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org for( i = 0; i < D; i++ ) { 75885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org matrix_c_ptr( wXX, i, i, D ) += regularization; 76885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org } 77885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org /* Increase noise for next run */ 78885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org regularization *= 2.0f; 79885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org } 80885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org } 81885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org if( k == MAX_ITERATIONS_RESIDUAL_NRG ) { 82885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org silk_assert( nrg == 0 ); 83885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org nrg = 1.0f; 84885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org } 85885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org 86885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org return nrg; 87885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org} 88885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org 89885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org/* Calculates residual energies of input subframes where all subframes have LPC_order */ 906b6bee25314cfac02cc555cddedb9680c63a26d6sergeyu@chromium.org/* of preceding samples */ 91885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.orgvoid silk_residual_energy_FLP( 92885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org silk_float nrgs[ MAX_NB_SUBFR ], /* O Residual energy per subframe */ 93885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org const silk_float x[], /* I Input signal */ 94885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org silk_float a[ 2 ][ MAX_LPC_ORDER ], /* I AR coefs for each frame half */ 95885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org const silk_float gains[], /* I Quantization gains */ 96885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org const opus_int subfr_length, /* I Subframe length */ 97885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org const opus_int nb_subfr, /* I number of subframes */ 98885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org const opus_int LPC_order /* I LPC order */ 99885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org) 100885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org{ 101885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org opus_int shift; 102885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org silk_float *LPC_res_ptr, LPC_res[ ( MAX_FRAME_LENGTH + MAX_NB_SUBFR * MAX_LPC_ORDER ) / 2 ]; 103885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org 104885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org LPC_res_ptr = LPC_res + LPC_order; 105885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org shift = LPC_order + subfr_length; 106885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org 107885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org /* Filter input to create the LPC residual for each frame half, and measure subframe energies */ 108885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org silk_LPC_analysis_filter_FLP( LPC_res, a[ 0 ], x + 0 * shift, 2 * shift, LPC_order ); 109885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org nrgs[ 0 ] = ( silk_float )( gains[ 0 ] * gains[ 0 ] * silk_energy_FLP( LPC_res_ptr + 0 * shift, subfr_length ) ); 110885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org nrgs[ 1 ] = ( silk_float )( gains[ 1 ] * gains[ 1 ] * silk_energy_FLP( LPC_res_ptr + 1 * shift, subfr_length ) ); 111885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org 112885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org if( nb_subfr == MAX_NB_SUBFR ) { 113885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org silk_LPC_analysis_filter_FLP( LPC_res, a[ 1 ], x + 2 * shift, 2 * shift, LPC_order ); 114885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org nrgs[ 2 ] = ( silk_float )( gains[ 2 ] * gains[ 2 ] * silk_energy_FLP( LPC_res_ptr + 0 * shift, subfr_length ) ); 115885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org nrgs[ 3 ] = ( silk_float )( gains[ 3 ] * gains[ 3 ] * silk_energy_FLP( LPC_res_ptr + 1 * shift, subfr_length ) ); 116885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org } 117885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org} 118