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comparison: media/libopus/silk/float/residual_energy_FLP.c
media/libopus/silk/float/residual_energy_FLP.c
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| 1 /*********************************************************************** | |
| 2 Copyright (c) 2006-2011, Skype Limited. All rights reserved. | |
| 3 Redistribution and use in source and binary forms, with or without | |
| 4 modification, are permitted provided that the following conditions | |
| 5 are met: | |
| 6 - Redistributions of source code must retain the above copyright notice, | |
| 7 this list of conditions and the following disclaimer. | |
| 8 - Redistributions in binary form must reproduce the above copyright | |
| 9 notice, this list of conditions and the following disclaimer in the | |
| 10 documentation and/or other materials provided with the distribution. | |
| 11 - Neither the name of Internet Society, IETF or IETF Trust, nor the | |
| 12 names of specific contributors, may be used to endorse or promote | |
| 13 products derived from this software without specific prior written | |
| 14 permission. | |
| 15 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" | |
| 16 AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
| 17 IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
| 18 ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE | |
| 19 LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR | |
| 20 CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF | |
| 21 SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS | |
| 22 INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN | |
| 23 CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) | |
| 24 ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE | |
| 25 POSSIBILITY OF SUCH DAMAGE. | |
| 26 ***********************************************************************/ | |
| 27 | |
| 28 #ifdef HAVE_CONFIG_H | |
| 29 #include "config.h" | |
| 30 #endif | |
| 31 | |
| 32 #include "main_FLP.h" | |
| 33 | |
| 34 #define MAX_ITERATIONS_RESIDUAL_NRG 10 | |
| 35 #define REGULARIZATION_FACTOR 1e-8f | |
| 36 | |
| 37 /* Residual energy: nrg = wxx - 2 * wXx * c + c' * wXX * c */ | |
| 38 silk_float silk_residual_energy_covar_FLP( /* O Weighted residual energy */ | |
| 39 const silk_float *c, /* I Filter coefficients */ | |
| 40 silk_float *wXX, /* I/O Weighted correlation matrix, reg. out */ | |
| 41 const silk_float *wXx, /* I Weighted correlation vector */ | |
| 42 const silk_float wxx, /* I Weighted correlation value */ | |
| 43 const opus_int D /* I Dimension */ | |
| 44 ) | |
| 45 { | |
| 46 opus_int i, j, k; | |
| 47 silk_float tmp, nrg = 0.0f, regularization; | |
| 48 | |
| 49 /* Safety checks */ | |
| 50 silk_assert( D >= 0 ); | |
| 51 | |
| 52 regularization = REGULARIZATION_FACTOR * ( wXX[ 0 ] + wXX[ D * D - 1 ] ); | |
| 53 for( k = 0; k < MAX_ITERATIONS_RESIDUAL_NRG; k++ ) { | |
| 54 nrg = wxx; | |
| 55 | |
| 56 tmp = 0.0f; | |
| 57 for( i = 0; i < D; i++ ) { | |
| 58 tmp += wXx[ i ] * c[ i ]; | |
| 59 } | |
| 60 nrg -= 2.0f * tmp; | |
| 61 | |
| 62 /* compute c' * wXX * c, assuming wXX is symmetric */ | |
| 63 for( i = 0; i < D; i++ ) { | |
| 64 tmp = 0.0f; | |
| 65 for( j = i + 1; j < D; j++ ) { | |
| 66 tmp += matrix_c_ptr( wXX, i, j, D ) * c[ j ]; | |
| 67 } | |
| 68 nrg += c[ i ] * ( 2.0f * tmp + matrix_c_ptr( wXX, i, i, D ) * c[ i ] ); | |
| 69 } | |
| 70 if( nrg > 0 ) { | |
| 71 break; | |
| 72 } else { | |
| 73 /* Add white noise */ | |
| 74 for( i = 0; i < D; i++ ) { | |
| 75 matrix_c_ptr( wXX, i, i, D ) += regularization; | |
| 76 } | |
| 77 /* Increase noise for next run */ | |
| 78 regularization *= 2.0f; | |
| 79 } | |
| 80 } | |
| 81 if( k == MAX_ITERATIONS_RESIDUAL_NRG ) { | |
| 82 silk_assert( nrg == 0 ); | |
| 83 nrg = 1.0f; | |
| 84 } | |
| 85 | |
| 86 return nrg; | |
| 87 } | |
| 88 | |
| 89 /* Calculates residual energies of input subframes where all subframes have LPC_order */ | |
| 90 /* of preceding samples */ | |
| 91 void silk_residual_energy_FLP( | |
| 92 silk_float nrgs[ MAX_NB_SUBFR ], /* O Residual energy per subframe */ | |
| 93 const silk_float x[], /* I Input signal */ | |
| 94 silk_float a[ 2 ][ MAX_LPC_ORDER ], /* I AR coefs for each frame half */ | |
| 95 const silk_float gains[], /* I Quantization gains */ | |
| 96 const opus_int subfr_length, /* I Subframe length */ | |
| 97 const opus_int nb_subfr, /* I number of subframes */ | |
| 98 const opus_int LPC_order /* I LPC order */ | |
| 99 ) | |
| 100 { | |
| 101 opus_int shift; | |
| 102 silk_float *LPC_res_ptr, LPC_res[ ( MAX_FRAME_LENGTH + MAX_NB_SUBFR * MAX_LPC_ORDER ) / 2 ]; | |
| 103 | |
| 104 LPC_res_ptr = LPC_res + LPC_order; | |
| 105 shift = LPC_order + subfr_length; | |
| 106 | |
| 107 /* Filter input to create the LPC residual for each frame half, and measure subframe energies */ | |
| 108 silk_LPC_analysis_filter_FLP( LPC_res, a[ 0 ], x + 0 * shift, 2 * shift, LPC_order ); | |
| 109 nrgs[ 0 ] = ( silk_float )( gains[ 0 ] * gains[ 0 ] * silk_energy_FLP( LPC_res_ptr + 0 * shift, subfr_length ) ); | |
| 110 nrgs[ 1 ] = ( silk_float )( gains[ 1 ] * gains[ 1 ] * silk_energy_FLP( LPC_res_ptr + 1 * shift, subfr_length ) ); | |
| 111 | |
| 112 if( nb_subfr == MAX_NB_SUBFR ) { | |
| 113 silk_LPC_analysis_filter_FLP( LPC_res, a[ 1 ], x + 2 * shift, 2 * shift, LPC_order ); | |
| 114 nrgs[ 2 ] = ( silk_float )( gains[ 2 ] * gains[ 2 ] * silk_energy_FLP( LPC_res_ptr + 0 * shift, subfr_length ) ); | |
| 115 nrgs[ 3 ] = ( silk_float )( gains[ 3 ] * gains[ 3 ] * silk_energy_FLP( LPC_res_ptr + 1 * shift, subfr_length ) ); | |
| 116 } | |
| 117 } |
