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 /********************************************************************** 33 * Correlation Matrix Computations for LS estimate. 34 **********************************************************************/ 35 36 #include "main_FIX.h" 37 38 /* Calculates correlation vector X'*t */ 39 void silk_corrVector_FIX( 40 const opus_int16 *x, /* I x vector [L + order - 1] used to form data matrix X */ 41 const opus_int16 *t, /* I Target vector [L] */ 42 const opus_int L, /* I Length of vectors */ 43 const opus_int order, /* I Max lag for correlation */ 44 opus_int32 *Xt, /* O Pointer to X'*t correlation vector [order] */ 45 const opus_int rshifts, /* I Right shifts of correlations */ 46 int arch /* I Run-time architecture */ 47 ) 48 { 49 opus_int lag, i; 50 const opus_int16 *ptr1, *ptr2; 51 opus_int32 inner_prod; 52 53 ptr1 = &x[ order - 1 ]; /* Points to first sample of column 0 of X: X[:,0] */ 54 ptr2 = t; 55 /* Calculate X'*t */ 56 if( rshifts > 0 ) { 57 /* Right shifting used */ 58 for( lag = 0; lag < order; lag++ ) { 59 inner_prod = 0; 60 for( i = 0; i < L; i++ ) { 61 inner_prod = silk_ADD_RSHIFT32( inner_prod, silk_SMULBB( ptr1[ i ], ptr2[i] ), rshifts ); 62 } 63 Xt[ lag ] = inner_prod; /* X[:,lag]'*t */ 64 ptr1--; /* Go to next column of X */ 65 } 66 } else { 67 silk_assert( rshifts == 0 ); 68 for( lag = 0; lag < order; lag++ ) { 69 Xt[ lag ] = silk_inner_prod_aligned( ptr1, ptr2, L, arch ); /* X[:,lag]'*t */ 70 ptr1--; /* Go to next column of X */ 71 } 72 } 73 } 74 75 /* Calculates correlation matrix X'*X */ 76 void silk_corrMatrix_FIX( 77 const opus_int16 *x, /* I x vector [L + order - 1] used to form data matrix X */ 78 const opus_int L, /* I Length of vectors */ 79 const opus_int order, /* I Max lag for correlation */ 80 opus_int32 *XX, /* O Pointer to X'*X correlation matrix [ order x order ] */ 81 opus_int32 *nrg, /* O Energy of x vector */ 82 opus_int *rshifts, /* O Right shifts of correlations and energy */ 83 int arch /* I Run-time architecture */ 84 ) 85 { 86 opus_int i, j, lag; 87 opus_int32 energy; 88 const opus_int16 *ptr1, *ptr2; 89 90 /* Calculate energy to find shift used to fit in 32 bits */ 91 silk_sum_sqr_shift( nrg, rshifts, x, L + order - 1 ); 92 energy = *nrg; 93 94 /* Calculate energy of first column (0) of X: X[:,0]'*X[:,0] */ 95 /* Remove contribution of first order - 1 samples */ 96 for( i = 0; i < order - 1; i++ ) { 97 energy -= silk_RSHIFT32( silk_SMULBB( x[ i ], x[ i ] ), *rshifts ); 98 } 99 100 /* Calculate energy of remaining columns of X: X[:,j]'*X[:,j] */ 101 /* Fill out the diagonal of the correlation matrix */ 102 matrix_ptr( XX, 0, 0, order ) = energy; 103 silk_assert( energy >= 0 ); 104 ptr1 = &x[ order - 1 ]; /* First sample of column 0 of X */ 105 for( j = 1; j < order; j++ ) { 106 energy = silk_SUB32( energy, silk_RSHIFT32( silk_SMULBB( ptr1[ L - j ], ptr1[ L - j ] ), *rshifts ) ); 107 energy = silk_ADD32( energy, silk_RSHIFT32( silk_SMULBB( ptr1[ -j ], ptr1[ -j ] ), *rshifts ) ); 108 matrix_ptr( XX, j, j, order ) = energy; 109 silk_assert( energy >= 0 ); 110 } 111 112 ptr2 = &x[ order - 2 ]; /* First sample of column 1 of X */ 113 /* Calculate the remaining elements of the correlation matrix */ 114 if( *rshifts > 0 ) { 115 /* Right shifting used */ 116 for( lag = 1; lag < order; lag++ ) { 117 /* Inner product of column 0 and column lag: X[:,0]'*X[:,lag] */ 118 energy = 0; 119 for( i = 0; i < L; i++ ) { 120 energy += silk_RSHIFT32( silk_SMULBB( ptr1[ i ], ptr2[i] ), *rshifts ); 121 } 122 /* Calculate remaining off diagonal: X[:,j]'*X[:,j + lag] */ 123 matrix_ptr( XX, lag, 0, order ) = energy; 124 matrix_ptr( XX, 0, lag, order ) = energy; 125 for( j = 1; j < ( order - lag ); j++ ) { 126 energy = silk_SUB32( energy, silk_RSHIFT32( silk_SMULBB( ptr1[ L - j ], ptr2[ L - j ] ), *rshifts ) ); 127 energy = silk_ADD32( energy, silk_RSHIFT32( silk_SMULBB( ptr1[ -j ], ptr2[ -j ] ), *rshifts ) ); 128 matrix_ptr( XX, lag + j, j, order ) = energy; 129 matrix_ptr( XX, j, lag + j, order ) = energy; 130 } 131 ptr2--; /* Update pointer to first sample of next column (lag) in X */ 132 } 133 } else { 134 for( lag = 1; lag < order; lag++ ) { 135 /* Inner product of column 0 and column lag: X[:,0]'*X[:,lag] */ 136 energy = silk_inner_prod_aligned( ptr1, ptr2, L, arch ); 137 matrix_ptr( XX, lag, 0, order ) = energy; 138 matrix_ptr( XX, 0, lag, order ) = energy; 139 /* Calculate remaining off diagonal: X[:,j]'*X[:,j + lag] */ 140 for( j = 1; j < ( order - lag ); j++ ) { 141 energy = silk_SUB32( energy, silk_SMULBB( ptr1[ L - j ], ptr2[ L - j ] ) ); 142 energy = silk_SMLABB( energy, ptr1[ -j ], ptr2[ -j ] ); 143 matrix_ptr( XX, lag + j, j, order ) = energy; 144 matrix_ptr( XX, j, lag + j, order ) = energy; 145 } 146 ptr2--;/* Update pointer to first sample of next column (lag) in X */ 147 } 148 } 149 } 150 151
