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 ) 47 { 48 opus_int lag, i; 49 const opus_int16 *ptr1, *ptr2; 50 opus_int32 inner_prod; 51 52 ptr1 = &x[ order - 1 ]; /* Points to first sample of column 0 of X: X[:,0] */ 53 ptr2 = t; 54 /* Calculate X'*t */ 55 if( rshifts > 0 ) { 56 /* Right shifting used */ 57 for( lag = 0; lag < order; lag++ ) { 58 inner_prod = 0; 59 for( i = 0; i < L; i++ ) { 60 inner_prod += silk_RSHIFT32( silk_SMULBB( ptr1[ i ], ptr2[i] ), rshifts ); 61 } 62 Xt[ lag ] = inner_prod; /* X[:,lag]'*t */ 63 ptr1--; /* Go to next column of X */ 64 } 65 } else { 66 silk_assert( rshifts == 0 ); 67 for( lag = 0; lag < order; lag++ ) { 68 Xt[ lag ] = silk_inner_prod_aligned( ptr1, ptr2, L ); /* X[:,lag]'*t */ 69 ptr1--; /* Go to next column of X */ 70 } 71 } 72 } 73 74 /* Calculates correlation matrix X'*X */ 75 void silk_corrMatrix_FIX( 76 const opus_int16 *x, /* I x vector [L + order - 1] used to form data matrix X */ 77 const opus_int L, /* I Length of vectors */ 78 const opus_int order, /* I Max lag for correlation */ 79 const opus_int head_room, /* I Desired headroom */ 80 opus_int32 *XX, /* O Pointer to X'*X correlation matrix [ order x order ] */ 81 opus_int *rshifts /* I/O Right shifts of correlations */ 82 ) 83 { 84 opus_int i, j, lag, rshifts_local, head_room_rshifts; 85 opus_int32 energy; 86 const opus_int16 *ptr1, *ptr2; 87 88 /* Calculate energy to find shift used to fit in 32 bits */ 89 silk_sum_sqr_shift( &energy, &rshifts_local, x, L + order - 1 ); 90 /* Add shifts to get the desired head room */ 91 head_room_rshifts = silk_max( head_room - silk_CLZ32( energy ), 0 ); 92 93 energy = silk_RSHIFT32( energy, head_room_rshifts ); 94 rshifts_local += head_room_rshifts; 95 96 /* Calculate energy of first column (0) of X: X[:,0]'*X[:,0] */ 97 /* Remove contribution of first order - 1 samples */ 98 for( i = 0; i < order - 1; i++ ) { 99 energy -= silk_RSHIFT32( silk_SMULBB( x[ i ], x[ i ] ), rshifts_local ); 100 } 101 if( rshifts_local < *rshifts ) { 102 /* Adjust energy */ 103 energy = silk_RSHIFT32( energy, *rshifts - rshifts_local ); 104 rshifts_local = *rshifts; 105 } 106 107 /* Calculate energy of remaining columns of X: X[:,j]'*X[:,j] */ 108 /* Fill out the diagonal of the correlation matrix */ 109 matrix_ptr( XX, 0, 0, order ) = energy; 110 ptr1 = &x[ order - 1 ]; /* First sample of column 0 of X */ 111 for( j = 1; j < order; j++ ) { 112 energy = silk_SUB32( energy, silk_RSHIFT32( silk_SMULBB( ptr1[ L - j ], ptr1[ L - j ] ), rshifts_local ) ); 113 energy = silk_ADD32( energy, silk_RSHIFT32( silk_SMULBB( ptr1[ -j ], ptr1[ -j ] ), rshifts_local ) ); 114 matrix_ptr( XX, j, j, order ) = energy; 115 } 116 117 ptr2 = &x[ order - 2 ]; /* First sample of column 1 of X */ 118 /* Calculate the remaining elements of the correlation matrix */ 119 if( rshifts_local > 0 ) { 120 /* Right shifting used */ 121 for( lag = 1; lag < order; lag++ ) { 122 /* Inner product of column 0 and column lag: X[:,0]'*X[:,lag] */ 123 energy = 0; 124 for( i = 0; i < L; i++ ) { 125 energy += silk_RSHIFT32( silk_SMULBB( ptr1[ i ], ptr2[i] ), rshifts_local ); 126 } 127 /* Calculate remaining off diagonal: X[:,j]'*X[:,j + lag] */ 128 matrix_ptr( XX, lag, 0, order ) = energy; 129 matrix_ptr( XX, 0, lag, order ) = energy; 130 for( j = 1; j < ( order - lag ); j++ ) { 131 energy = silk_SUB32( energy, silk_RSHIFT32( silk_SMULBB( ptr1[ L - j ], ptr2[ L - j ] ), rshifts_local ) ); 132 energy = silk_ADD32( energy, silk_RSHIFT32( silk_SMULBB( ptr1[ -j ], ptr2[ -j ] ), rshifts_local ) ); 133 matrix_ptr( XX, lag + j, j, order ) = energy; 134 matrix_ptr( XX, j, lag + j, order ) = energy; 135 } 136 ptr2--; /* Update pointer to first sample of next column (lag) in X */ 137 } 138 } else { 139 for( lag = 1; lag < order; lag++ ) { 140 /* Inner product of column 0 and column lag: X[:,0]'*X[:,lag] */ 141 energy = silk_inner_prod_aligned( ptr1, ptr2, L ); 142 matrix_ptr( XX, lag, 0, order ) = energy; 143 matrix_ptr( XX, 0, lag, order ) = energy; 144 /* Calculate remaining off diagonal: X[:,j]'*X[:,j + lag] */ 145 for( j = 1; j < ( order - lag ); j++ ) { 146 energy = silk_SUB32( energy, silk_SMULBB( ptr1[ L - j ], ptr2[ L - j ] ) ); 147 energy = silk_SMLABB( energy, ptr1[ -j ], ptr2[ -j ] ); 148 matrix_ptr( XX, lag + j, j, order ) = energy; 149 matrix_ptr( XX, j, lag + j, order ) = energy; 150 } 151 ptr2--;/* Update pointer to first sample of next column (lag) in X */ 152 } 153 } 154 *rshifts = rshifts_local; 155 } 156 157
