100 lines
4.5 KiB
C
100 lines
4.5 KiB
C
/***********************************************************************
|
|
Copyright (c) 2006-2011, Skype Limited. All rights reserved.
|
|
Redistribution and use in source and binary forms, with or without
|
|
modification, (subject to the limitations in the disclaimer below)
|
|
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 Skype Limited, nor the names of specific
|
|
contributors, may be used to endorse or promote products derived from
|
|
this software without specific prior written permission.
|
|
NO EXPRESS OR IMPLIED LICENSES TO ANY PARTY'S PATENT RIGHTS ARE GRANTED
|
|
BY THIS LICENSE. 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.
|
|
***********************************************************************/
|
|
|
|
#include "SKP_Silk_main_FIX.h"
|
|
|
|
/* Residual energy: nrg = wxx - 2 * wXx * c + c' * wXX * c */
|
|
SKP_int32 SKP_Silk_residual_energy16_covar_FIX(
|
|
const SKP_int16 *c, /* I Prediction vector */
|
|
const SKP_int32 *wXX, /* I Correlation matrix */
|
|
const SKP_int32 *wXx, /* I Correlation vector */
|
|
SKP_int32 wxx, /* I Signal energy */
|
|
SKP_int D, /* I Dimension */
|
|
SKP_int cQ /* I Q value for c vector 0 - 15 */
|
|
)
|
|
{
|
|
SKP_int i, j, lshifts, Qxtra;
|
|
SKP_int32 c_max, w_max, tmp, tmp2, nrg;
|
|
SKP_int cn[ MAX_MATRIX_SIZE ];
|
|
const SKP_int32 *pRow;
|
|
|
|
/* Safety checks */
|
|
SKP_assert( D >= 0 );
|
|
SKP_assert( D <= 16 );
|
|
SKP_assert( cQ > 0 );
|
|
SKP_assert( cQ < 16 );
|
|
|
|
lshifts = 16 - cQ;
|
|
Qxtra = lshifts;
|
|
|
|
c_max = 0;
|
|
for( i = 0; i < D; i++ ) {
|
|
c_max = SKP_max_32( c_max, SKP_abs( ( SKP_int32 )c[ i ] ) );
|
|
}
|
|
Qxtra = SKP_min_int( Qxtra, SKP_Silk_CLZ32( c_max ) - 17 );
|
|
|
|
w_max = SKP_max_32( wXX[ 0 ], wXX[ D * D - 1 ] );
|
|
Qxtra = SKP_min_int( Qxtra, SKP_Silk_CLZ32( SKP_MUL( D, SKP_RSHIFT( SKP_SMULWB( w_max, c_max ), 4 ) ) ) - 5 );
|
|
Qxtra = SKP_max_int( Qxtra, 0 );
|
|
for( i = 0; i < D; i++ ) {
|
|
cn[ i ] = SKP_LSHIFT( ( SKP_int )c[ i ], Qxtra );
|
|
SKP_assert( SKP_abs(cn[i]) <= ( SKP_int16_MAX + 1 ) ); /* Check that SKP_SMLAWB can be used */
|
|
}
|
|
lshifts -= Qxtra;
|
|
|
|
/* Compute wxx - 2 * wXx * c */
|
|
tmp = 0;
|
|
for( i = 0; i < D; i++ ) {
|
|
tmp = SKP_SMLAWB( tmp, wXx[ i ], cn[ i ] );
|
|
}
|
|
nrg = SKP_RSHIFT( wxx, 1 + lshifts ) - tmp; /* Q: -lshifts - 1 */
|
|
|
|
/* Add c' * wXX * c, assuming wXX is symmetric */
|
|
tmp2 = 0;
|
|
for( i = 0; i < D; i++ ) {
|
|
tmp = 0;
|
|
pRow = &wXX[ i * D ];
|
|
for( j = i + 1; j < D; j++ ) {
|
|
tmp = SKP_SMLAWB( tmp, pRow[ j ], cn[ j ] );
|
|
}
|
|
tmp = SKP_SMLAWB( tmp, SKP_RSHIFT( pRow[ i ], 1 ), cn[ i ] );
|
|
tmp2 = SKP_SMLAWB( tmp2, tmp, cn[ i ] );
|
|
}
|
|
nrg = SKP_ADD_LSHIFT32( nrg, tmp2, lshifts ); /* Q: -lshifts - 1 */
|
|
|
|
/* Keep one bit free always, because we add them for LSF interpolation */
|
|
if( nrg < 1 ) {
|
|
nrg = 1;
|
|
} else if( nrg > SKP_RSHIFT( SKP_int32_MAX, lshifts + 2 ) ) {
|
|
nrg = SKP_int32_MAX >> 1;
|
|
} else {
|
|
nrg = SKP_LSHIFT( nrg, lshifts + 1 ); /* Q0 */
|
|
}
|
|
return nrg;
|
|
|
|
}
|