cannam@154: /***********************************************************************
cannam@154: Copyright (c) 2006-2011, Skype Limited. All rights reserved.
cannam@154: Redistribution and use in source and binary forms, with or without
cannam@154: modification, are permitted provided that the following conditions
cannam@154: are met:
cannam@154: - Redistributions of source code must retain the above copyright notice,
cannam@154: this list of conditions and the following disclaimer.
cannam@154: - Redistributions in binary form must reproduce the above copyright
cannam@154: notice, this list of conditions and the following disclaimer in the
cannam@154: documentation and/or other materials provided with the distribution.
cannam@154: - Neither the name of Internet Society, IETF or IETF Trust, nor the
cannam@154: names of specific contributors, may be used to endorse or promote
cannam@154: products derived from this software without specific prior written
cannam@154: permission.
cannam@154: THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
cannam@154: AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
cannam@154: IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
cannam@154: ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
cannam@154: LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
cannam@154: CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
cannam@154: SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
cannam@154: INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
cannam@154: CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
cannam@154: ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
cannam@154: POSSIBILITY OF SUCH DAMAGE.
cannam@154: ***********************************************************************/
cannam@154: 
cannam@154: #ifdef HAVE_CONFIG_H
cannam@154: #include "config.h"
cannam@154: #endif
cannam@154: 
cannam@154: /**********************************************************************
cannam@154:  * Correlation matrix computations for LS estimate.
cannam@154:  **********************************************************************/
cannam@154: 
cannam@154: #include "main_FLP.h"
cannam@154: 
cannam@154: /* Calculates correlation vector X'*t */
cannam@154: void silk_corrVector_FLP(
cannam@154:     const silk_float                *x,                                 /* I    x vector [L+order-1] used to create X       */
cannam@154:     const silk_float                *t,                                 /* I    Target vector [L]                           */
cannam@154:     const opus_int                  L,                                  /* I    Length of vecors                            */
cannam@154:     const opus_int                  Order,                              /* I    Max lag for correlation                     */
cannam@154:     silk_float                      *Xt                                 /* O    X'*t correlation vector [order]             */
cannam@154: )
cannam@154: {
cannam@154:     opus_int lag;
cannam@154:     const silk_float *ptr1;
cannam@154: 
cannam@154:     ptr1 = &x[ Order - 1 ];                     /* Points to first sample of column 0 of X: X[:,0] */
cannam@154:     for( lag = 0; lag < Order; lag++ ) {
cannam@154:         /* Calculate X[:,lag]'*t */
cannam@154:         Xt[ lag ] = (silk_float)silk_inner_product_FLP( ptr1, t, L );
cannam@154:         ptr1--;                                 /* Next column of X */
cannam@154:     }
cannam@154: }
cannam@154: 
cannam@154: /* Calculates correlation matrix X'*X */
cannam@154: void silk_corrMatrix_FLP(
cannam@154:     const silk_float                *x,                                 /* I    x vector [ L+order-1 ] used to create X     */
cannam@154:     const opus_int                  L,                                  /* I    Length of vectors                           */
cannam@154:     const opus_int                  Order,                              /* I    Max lag for correlation                     */
cannam@154:     silk_float                      *XX                                 /* O    X'*X correlation matrix [order x order]     */
cannam@154: )
cannam@154: {
cannam@154:     opus_int j, lag;
cannam@154:     double  energy;
cannam@154:     const silk_float *ptr1, *ptr2;
cannam@154: 
cannam@154:     ptr1 = &x[ Order - 1 ];                     /* First sample of column 0 of X */
cannam@154:     energy = silk_energy_FLP( ptr1, L );  /* X[:,0]'*X[:,0] */
cannam@154:     matrix_ptr( XX, 0, 0, Order ) = ( silk_float )energy;
cannam@154:     for( j = 1; j < Order; j++ ) {
cannam@154:         /* Calculate X[:,j]'*X[:,j] */
cannam@154:         energy += ptr1[ -j ] * ptr1[ -j ] - ptr1[ L - j ] * ptr1[ L - j ];
cannam@154:         matrix_ptr( XX, j, j, Order ) = ( silk_float )energy;
cannam@154:     }
cannam@154: 
cannam@154:     ptr2 = &x[ Order - 2 ];                     /* First sample of column 1 of X */
cannam@154:     for( lag = 1; lag < Order; lag++ ) {
cannam@154:         /* Calculate X[:,0]'*X[:,lag] */
cannam@154:         energy = silk_inner_product_FLP( ptr1, ptr2, L );
cannam@154:         matrix_ptr( XX, lag, 0, Order ) = ( silk_float )energy;
cannam@154:         matrix_ptr( XX, 0, lag, Order ) = ( silk_float )energy;
cannam@154:         /* Calculate X[:,j]'*X[:,j + lag] */
cannam@154:         for( j = 1; j < ( Order - lag ); j++ ) {
cannam@154:             energy += ptr1[ -j ] * ptr2[ -j ] - ptr1[ L - j ] * ptr2[ L - j ];
cannam@154:             matrix_ptr( XX, lag + j, j, Order ) = ( silk_float )energy;
cannam@154:             matrix_ptr( XX, j, lag + j, Order ) = ( silk_float )energy;
cannam@154:         }
cannam@154:         ptr2--;                                 /* Next column of X */
cannam@154:     }
cannam@154: }