mirror of
https://github.com/DrBeef/ioq3quest.git
synced 2024-12-12 05:22:24 +00:00
156 lines
8.2 KiB
C
156 lines
8.2 KiB
C
/***********************************************************************
|
|
Copyright (c) 2006-2011, Skype Limited. All rights reserved.
|
|
Redistribution and use in source and binary forms, with or without
|
|
modification, are permitted provided that the following conditions
|
|
are met:
|
|
- Redistributions of source code must retain the above copyright notice,
|
|
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
|
|
documentation and/or other materials provided with the distribution.
|
|
- Neither the name of Internet Society, IETF or IETF Trust, nor the
|
|
names of specific contributors, may be used to endorse or promote
|
|
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
|
|
LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
|
|
CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
|
|
SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
|
|
INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
|
|
CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
|
|
ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
|
|
POSSIBILITY OF SUCH DAMAGE.
|
|
***********************************************************************/
|
|
|
|
#ifdef HAVE_CONFIG_H
|
|
#include "config.h"
|
|
#endif
|
|
|
|
/**********************************************************************
|
|
* Correlation Matrix Computations for LS estimate.
|
|
**********************************************************************/
|
|
|
|
#include "main_FIX.h"
|
|
|
|
/* Calculates correlation vector X'*t */
|
|
void silk_corrVector_FIX(
|
|
const opus_int16 *x, /* I x vector [L + order - 1] used to form data matrix X */
|
|
const opus_int16 *t, /* I Target vector [L] */
|
|
const opus_int L, /* I Length of vectors */
|
|
const opus_int order, /* I Max lag for correlation */
|
|
opus_int32 *Xt, /* O Pointer to X'*t correlation vector [order] */
|
|
const opus_int rshifts /* I Right shifts of correlations */
|
|
)
|
|
{
|
|
opus_int lag, i;
|
|
const opus_int16 *ptr1, *ptr2;
|
|
opus_int32 inner_prod;
|
|
|
|
ptr1 = &x[ order - 1 ]; /* Points to first sample of column 0 of X: X[:,0] */
|
|
ptr2 = t;
|
|
/* Calculate X'*t */
|
|
if( rshifts > 0 ) {
|
|
/* Right shifting used */
|
|
for( lag = 0; lag < order; lag++ ) {
|
|
inner_prod = 0;
|
|
for( i = 0; i < L; i++ ) {
|
|
inner_prod += silk_RSHIFT32( silk_SMULBB( ptr1[ i ], ptr2[i] ), rshifts );
|
|
}
|
|
Xt[ lag ] = inner_prod; /* X[:,lag]'*t */
|
|
ptr1--; /* Go to next column of X */
|
|
}
|
|
} else {
|
|
silk_assert( rshifts == 0 );
|
|
for( lag = 0; lag < order; lag++ ) {
|
|
Xt[ lag ] = silk_inner_prod_aligned( ptr1, ptr2, L ); /* X[:,lag]'*t */
|
|
ptr1--; /* Go to next column of X */
|
|
}
|
|
}
|
|
}
|
|
|
|
/* Calculates correlation matrix X'*X */
|
|
void silk_corrMatrix_FIX(
|
|
const opus_int16 *x, /* I x vector [L + order - 1] used to form data matrix X */
|
|
const opus_int L, /* I Length of vectors */
|
|
const opus_int order, /* I Max lag for correlation */
|
|
const opus_int head_room, /* I Desired headroom */
|
|
opus_int32 *XX, /* O Pointer to X'*X correlation matrix [ order x order ] */
|
|
opus_int *rshifts /* I/O Right shifts of correlations */
|
|
)
|
|
{
|
|
opus_int i, j, lag, rshifts_local, head_room_rshifts;
|
|
opus_int32 energy;
|
|
const opus_int16 *ptr1, *ptr2;
|
|
|
|
/* Calculate energy to find shift used to fit in 32 bits */
|
|
silk_sum_sqr_shift( &energy, &rshifts_local, x, L + order - 1 );
|
|
/* Add shifts to get the desired head room */
|
|
head_room_rshifts = silk_max( head_room - silk_CLZ32( energy ), 0 );
|
|
|
|
energy = silk_RSHIFT32( energy, head_room_rshifts );
|
|
rshifts_local += head_room_rshifts;
|
|
|
|
/* Calculate energy of first column (0) of X: X[:,0]'*X[:,0] */
|
|
/* Remove contribution of first order - 1 samples */
|
|
for( i = 0; i < order - 1; i++ ) {
|
|
energy -= silk_RSHIFT32( silk_SMULBB( x[ i ], x[ i ] ), rshifts_local );
|
|
}
|
|
if( rshifts_local < *rshifts ) {
|
|
/* Adjust energy */
|
|
energy = silk_RSHIFT32( energy, *rshifts - rshifts_local );
|
|
rshifts_local = *rshifts;
|
|
}
|
|
|
|
/* Calculate energy of remaining columns of X: X[:,j]'*X[:,j] */
|
|
/* Fill out the diagonal of the correlation matrix */
|
|
matrix_ptr( XX, 0, 0, order ) = energy;
|
|
ptr1 = &x[ order - 1 ]; /* First sample of column 0 of X */
|
|
for( j = 1; j < order; j++ ) {
|
|
energy = silk_SUB32( energy, silk_RSHIFT32( silk_SMULBB( ptr1[ L - j ], ptr1[ L - j ] ), rshifts_local ) );
|
|
energy = silk_ADD32( energy, silk_RSHIFT32( silk_SMULBB( ptr1[ -j ], ptr1[ -j ] ), rshifts_local ) );
|
|
matrix_ptr( XX, j, j, order ) = energy;
|
|
}
|
|
|
|
ptr2 = &x[ order - 2 ]; /* First sample of column 1 of X */
|
|
/* Calculate the remaining elements of the correlation matrix */
|
|
if( rshifts_local > 0 ) {
|
|
/* Right shifting used */
|
|
for( lag = 1; lag < order; lag++ ) {
|
|
/* Inner product of column 0 and column lag: X[:,0]'*X[:,lag] */
|
|
energy = 0;
|
|
for( i = 0; i < L; i++ ) {
|
|
energy += silk_RSHIFT32( silk_SMULBB( ptr1[ i ], ptr2[i] ), rshifts_local );
|
|
}
|
|
/* Calculate remaining off diagonal: X[:,j]'*X[:,j + lag] */
|
|
matrix_ptr( XX, lag, 0, order ) = energy;
|
|
matrix_ptr( XX, 0, lag, order ) = energy;
|
|
for( j = 1; j < ( order - lag ); j++ ) {
|
|
energy = silk_SUB32( energy, silk_RSHIFT32( silk_SMULBB( ptr1[ L - j ], ptr2[ L - j ] ), rshifts_local ) );
|
|
energy = silk_ADD32( energy, silk_RSHIFT32( silk_SMULBB( ptr1[ -j ], ptr2[ -j ] ), rshifts_local ) );
|
|
matrix_ptr( XX, lag + j, j, order ) = energy;
|
|
matrix_ptr( XX, j, lag + j, order ) = energy;
|
|
}
|
|
ptr2--; /* Update pointer to first sample of next column (lag) in X */
|
|
}
|
|
} else {
|
|
for( lag = 1; lag < order; lag++ ) {
|
|
/* Inner product of column 0 and column lag: X[:,0]'*X[:,lag] */
|
|
energy = silk_inner_prod_aligned( ptr1, ptr2, L );
|
|
matrix_ptr( XX, lag, 0, order ) = energy;
|
|
matrix_ptr( XX, 0, lag, order ) = energy;
|
|
/* Calculate remaining off diagonal: X[:,j]'*X[:,j + lag] */
|
|
for( j = 1; j < ( order - lag ); j++ ) {
|
|
energy = silk_SUB32( energy, silk_SMULBB( ptr1[ L - j ], ptr2[ L - j ] ) );
|
|
energy = silk_SMLABB( energy, ptr1[ -j ], ptr2[ -j ] );
|
|
matrix_ptr( XX, lag + j, j, order ) = energy;
|
|
matrix_ptr( XX, j, lag + j, order ) = energy;
|
|
}
|
|
ptr2--;/* Update pointer to first sample of next column (lag) in X */
|
|
}
|
|
}
|
|
*rshifts = rshifts_local;
|
|
}
|
|
|