1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/media/libopus/silk/float/corrMatrix_FLP.c Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,93 @@
1.4 +/***********************************************************************
1.5 +Copyright (c) 2006-2011, Skype Limited. All rights reserved.
1.6 +Redistribution and use in source and binary forms, with or without
1.7 +modification, are permitted provided that the following conditions
1.8 +are met:
1.9 +- Redistributions of source code must retain the above copyright notice,
1.10 +this list of conditions and the following disclaimer.
1.11 +- Redistributions in binary form must reproduce the above copyright
1.12 +notice, this list of conditions and the following disclaimer in the
1.13 +documentation and/or other materials provided with the distribution.
1.14 +- Neither the name of Internet Society, IETF or IETF Trust, nor the
1.15 +names of specific contributors, may be used to endorse or promote
1.16 +products derived from this software without specific prior written
1.17 +permission.
1.18 +THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
1.19 +AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
1.20 +IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
1.21 +ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
1.22 +LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
1.23 +CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
1.24 +SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
1.25 +INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
1.26 +CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
1.27 +ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
1.28 +POSSIBILITY OF SUCH DAMAGE.
1.29 +***********************************************************************/
1.30 +
1.31 +#ifdef HAVE_CONFIG_H
1.32 +#include "config.h"
1.33 +#endif
1.34 +
1.35 +/**********************************************************************
1.36 + * Correlation matrix computations for LS estimate.
1.37 + **********************************************************************/
1.38 +
1.39 +#include "main_FLP.h"
1.40 +
1.41 +/* Calculates correlation vector X'*t */
1.42 +void silk_corrVector_FLP(
1.43 + const silk_float *x, /* I x vector [L+order-1] used to create X */
1.44 + const silk_float *t, /* I Target vector [L] */
1.45 + const opus_int L, /* I Length of vecors */
1.46 + const opus_int Order, /* I Max lag for correlation */
1.47 + silk_float *Xt /* O X'*t correlation vector [order] */
1.48 +)
1.49 +{
1.50 + opus_int lag;
1.51 + const silk_float *ptr1;
1.52 +
1.53 + ptr1 = &x[ Order - 1 ]; /* Points to first sample of column 0 of X: X[:,0] */
1.54 + for( lag = 0; lag < Order; lag++ ) {
1.55 + /* Calculate X[:,lag]'*t */
1.56 + Xt[ lag ] = (silk_float)silk_inner_product_FLP( ptr1, t, L );
1.57 + ptr1--; /* Next column of X */
1.58 + }
1.59 +}
1.60 +
1.61 +/* Calculates correlation matrix X'*X */
1.62 +void silk_corrMatrix_FLP(
1.63 + const silk_float *x, /* I x vector [ L+order-1 ] used to create X */
1.64 + const opus_int L, /* I Length of vectors */
1.65 + const opus_int Order, /* I Max lag for correlation */
1.66 + silk_float *XX /* O X'*X correlation matrix [order x order] */
1.67 +)
1.68 +{
1.69 + opus_int j, lag;
1.70 + double energy;
1.71 + const silk_float *ptr1, *ptr2;
1.72 +
1.73 + ptr1 = &x[ Order - 1 ]; /* First sample of column 0 of X */
1.74 + energy = silk_energy_FLP( ptr1, L ); /* X[:,0]'*X[:,0] */
1.75 + matrix_ptr( XX, 0, 0, Order ) = ( silk_float )energy;
1.76 + for( j = 1; j < Order; j++ ) {
1.77 + /* Calculate X[:,j]'*X[:,j] */
1.78 + energy += ptr1[ -j ] * ptr1[ -j ] - ptr1[ L - j ] * ptr1[ L - j ];
1.79 + matrix_ptr( XX, j, j, Order ) = ( silk_float )energy;
1.80 + }
1.81 +
1.82 + ptr2 = &x[ Order - 2 ]; /* First sample of column 1 of X */
1.83 + for( lag = 1; lag < Order; lag++ ) {
1.84 + /* Calculate X[:,0]'*X[:,lag] */
1.85 + energy = silk_inner_product_FLP( ptr1, ptr2, L );
1.86 + matrix_ptr( XX, lag, 0, Order ) = ( silk_float )energy;
1.87 + matrix_ptr( XX, 0, lag, Order ) = ( silk_float )energy;
1.88 + /* Calculate X[:,j]'*X[:,j + lag] */
1.89 + for( j = 1; j < ( Order - lag ); j++ ) {
1.90 + energy += ptr1[ -j ] * ptr2[ -j ] - ptr1[ L - j ] * ptr2[ L - j ];
1.91 + matrix_ptr( XX, lag + j, j, Order ) = ( silk_float )energy;
1.92 + matrix_ptr( XX, j, lag + j, Order ) = ( silk_float )energy;
1.93 + }
1.94 + ptr2--; /* Next column of X */
1.95 + }
1.96 +}
