| /*********************************************************************** |
| Copyright (c) 2006-2011, Skype Limited. All rights reserved. |
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| modification, are permitted provided that the following conditions |
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| this list of conditions and the following disclaimer. |
| - Redistributions in binary form must reproduce the above copyright |
| notice, this list of conditions and the following disclaimer in the |
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| - Neither the name of Internet Society, IETF or IETF Trust, nor the |
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| products derived from this software without specific prior written |
| permission. |
| THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" |
| AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE |
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| ***********************************************************************/ |
| |
| #ifdef HAVE_CONFIG_H |
| #include "config.h" |
| #endif |
| |
| /********************************************************************** |
| * Correlation matrix computations for LS estimate. |
| **********************************************************************/ |
| |
| #include "main_FLP.h" |
| |
| /* Calculates correlation vector X'*t */ |
| void silk_corrVector_FLP( |
| const silk_float *x, /* I x vector [L+order-1] used to create X */ |
| const silk_float *t, /* I Target vector [L] */ |
| const opus_int L, /* I Length of vecors */ |
| const opus_int Order, /* I Max lag for correlation */ |
| silk_float *Xt /* O X'*t correlation vector [order] */ |
| ) |
| { |
| opus_int lag; |
| const silk_float *ptr1; |
| |
| ptr1 = &x[ Order - 1 ]; /* Points to first sample of column 0 of X: X[:,0] */ |
| for( lag = 0; lag < Order; lag++ ) { |
| /* Calculate X[:,lag]'*t */ |
| Xt[ lag ] = (silk_float)silk_inner_product_FLP( ptr1, t, L ); |
| ptr1--; /* Next column of X */ |
| } |
| } |
| |
| /* Calculates correlation matrix X'*X */ |
| void silk_corrMatrix_FLP( |
| const silk_float *x, /* I x vector [ L+order-1 ] used to create X */ |
| const opus_int L, /* I Length of vectors */ |
| const opus_int Order, /* I Max lag for correlation */ |
| silk_float *XX /* O X'*X correlation matrix [order x order] */ |
| ) |
| { |
| opus_int j, lag; |
| double energy; |
| const silk_float *ptr1, *ptr2; |
| |
| ptr1 = &x[ Order - 1 ]; /* First sample of column 0 of X */ |
| energy = silk_energy_FLP( ptr1, L ); /* X[:,0]'*X[:,0] */ |
| matrix_ptr( XX, 0, 0, Order ) = ( silk_float )energy; |
| for( j = 1; j < Order; j++ ) { |
| /* Calculate X[:,j]'*X[:,j] */ |
| energy += ptr1[ -j ] * ptr1[ -j ] - ptr1[ L - j ] * ptr1[ L - j ]; |
| matrix_ptr( XX, j, j, Order ) = ( silk_float )energy; |
| } |
| |
| ptr2 = &x[ Order - 2 ]; /* First sample of column 1 of X */ |
| for( lag = 1; lag < Order; lag++ ) { |
| /* Calculate X[:,0]'*X[:,lag] */ |
| energy = silk_inner_product_FLP( ptr1, ptr2, L ); |
| matrix_ptr( XX, lag, 0, Order ) = ( silk_float )energy; |
| matrix_ptr( XX, 0, lag, Order ) = ( silk_float )energy; |
| /* Calculate X[:,j]'*X[:,j + lag] */ |
| for( j = 1; j < ( Order - lag ); j++ ) { |
| energy += ptr1[ -j ] * ptr2[ -j ] - ptr1[ L - j ] * ptr2[ L - j ]; |
| matrix_ptr( XX, lag + j, j, Order ) = ( silk_float )energy; |
| matrix_ptr( XX, j, lag + j, Order ) = ( silk_float )energy; |
| } |
| ptr2--; /* Next column of X */ |
| } |
| } |