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
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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: #include "main_FIX.h"
cannam@154: 
cannam@154: /* Residual energy: nrg = wxx - 2 * wXx * c + c' * wXX * c */
cannam@154: opus_int32 silk_residual_energy16_covar_FIX(
cannam@154:     const opus_int16                *c,                                     /* I    Prediction vector                                                           */
cannam@154:     const opus_int32                *wXX,                                   /* I    Correlation matrix                                                          */
cannam@154:     const opus_int32                *wXx,                                   /* I    Correlation vector                                                          */
cannam@154:     opus_int32                      wxx,                                    /* I    Signal energy                                                               */
cannam@154:     opus_int                        D,                                      /* I    Dimension                                                                   */
cannam@154:     opus_int                        cQ                                      /* I    Q value for c vector 0 - 15                                                 */
cannam@154: )
cannam@154: {
cannam@154:     opus_int   i, j, lshifts, Qxtra;
cannam@154:     opus_int32 c_max, w_max, tmp, tmp2, nrg;
cannam@154:     opus_int   cn[ MAX_MATRIX_SIZE ];
cannam@154:     const opus_int32 *pRow;
cannam@154: 
cannam@154:     /* Safety checks */
cannam@154:     celt_assert( D >=  0 );
cannam@154:     celt_assert( D <= 16 );
cannam@154:     celt_assert( cQ >  0 );
cannam@154:     celt_assert( cQ < 16 );
cannam@154: 
cannam@154:     lshifts = 16 - cQ;
cannam@154:     Qxtra = lshifts;
cannam@154: 
cannam@154:     c_max = 0;
cannam@154:     for( i = 0; i < D; i++ ) {
cannam@154:         c_max = silk_max_32( c_max, silk_abs( (opus_int32)c[ i ] ) );
cannam@154:     }
cannam@154:     Qxtra = silk_min_int( Qxtra, silk_CLZ32( c_max ) - 17 );
cannam@154: 
cannam@154:     w_max = silk_max_32( wXX[ 0 ], wXX[ D * D - 1 ] );
cannam@154:     Qxtra = silk_min_int( Qxtra, silk_CLZ32( silk_MUL( D, silk_RSHIFT( silk_SMULWB( w_max, c_max ), 4 ) ) ) - 5 );
cannam@154:     Qxtra = silk_max_int( Qxtra, 0 );
cannam@154:     for( i = 0; i < D; i++ ) {
cannam@154:         cn[ i ] = silk_LSHIFT( ( opus_int )c[ i ], Qxtra );
cannam@154:         silk_assert( silk_abs(cn[i]) <= ( silk_int16_MAX + 1 ) ); /* Check that silk_SMLAWB can be used */
cannam@154:     }
cannam@154:     lshifts -= Qxtra;
cannam@154: 
cannam@154:     /* Compute wxx - 2 * wXx * c */
cannam@154:     tmp = 0;
cannam@154:     for( i = 0; i < D; i++ ) {
cannam@154:         tmp = silk_SMLAWB( tmp, wXx[ i ], cn[ i ] );
cannam@154:     }
cannam@154:     nrg = silk_RSHIFT( wxx, 1 + lshifts ) - tmp;                         /* Q: -lshifts - 1 */
cannam@154: 
cannam@154:     /* Add c' * wXX * c, assuming wXX is symmetric */
cannam@154:     tmp2 = 0;
cannam@154:     for( i = 0; i < D; i++ ) {
cannam@154:         tmp = 0;
cannam@154:         pRow = &wXX[ i * D ];
cannam@154:         for( j = i + 1; j < D; j++ ) {
cannam@154:             tmp = silk_SMLAWB( tmp, pRow[ j ], cn[ j ] );
cannam@154:         }
cannam@154:         tmp  = silk_SMLAWB( tmp,  silk_RSHIFT( pRow[ i ], 1 ), cn[ i ] );
cannam@154:         tmp2 = silk_SMLAWB( tmp2, tmp,                        cn[ i ] );
cannam@154:     }
cannam@154:     nrg = silk_ADD_LSHIFT32( nrg, tmp2, lshifts );                       /* Q: -lshifts - 1 */
cannam@154: 
cannam@154:     /* Keep one bit free always, because we add them for LSF interpolation */
cannam@154:     if( nrg < 1 ) {
cannam@154:         nrg = 1;
cannam@154:     } else if( nrg > silk_RSHIFT( silk_int32_MAX, lshifts + 2 ) ) {
cannam@154:         nrg = silk_int32_MAX >> 1;
cannam@154:     } else {
cannam@154:         nrg = silk_LSHIFT( nrg, lshifts + 1 );                           /* Q0 */
cannam@154:     }
cannam@154:     return nrg;
cannam@154: 
cannam@154: }