Add copy of opus library in deps/third_party.

opus/silk/fixed/residual_energy16_FIX.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:
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+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
+
+#include "main_FIX.h"
+
+/* Residual energy: nrg = wxx - 2 * wXx * c + c' * wXX * c */
+opus_int32 silk_residual_energy16_covar_FIX(
+    const opus_int16                *c,                                     /* I    Prediction vector                                                           */
+    const opus_int32                *wXX,                                   /* I    Correlation matrix                                                          */
+    const opus_int32                *wXx,                                   /* I    Correlation vector                                                          */
+    opus_int32                      wxx,                                    /* I    Signal energy                                                               */
+    opus_int                        D,                                      /* I    Dimension                                                                   */
+    opus_int                        cQ                                      /* I    Q value for c vector 0 - 15                                                 */
+)
+{
+    opus_int   i, j, lshifts, Qxtra;
+    opus_int32 c_max, w_max, tmp, tmp2, nrg;
+    opus_int   cn[ MAX_MATRIX_SIZE ];
+    const opus_int32 *pRow;
+
+    /* Safety checks */
+    silk_assert( D >=  0 );
+    silk_assert( D <= 16 );
+    silk_assert( cQ >  0 );
+    silk_assert( cQ < 16 );
+
+    lshifts = 16 - cQ;
+    Qxtra = lshifts;
+
+    c_max = 0;
+    for( i = 0; i < D; i++ ) {
+        c_max = silk_max_32( c_max, silk_abs( (opus_int32)c[ i ] ) );
+    }
+    Qxtra = silk_min_int( Qxtra, silk_CLZ32( c_max ) - 17 );
+
+    w_max = silk_max_32( wXX[ 0 ], wXX[ D * D - 1 ] );
+    Qxtra = silk_min_int( Qxtra, silk_CLZ32( silk_MUL( D, silk_RSHIFT( silk_SMULWB( w_max, c_max ), 4 ) ) ) - 5 );
+    Qxtra = silk_max_int( Qxtra, 0 );
+    for( i = 0; i < D; i++ ) {
+        cn[ i ] = silk_LSHIFT( ( opus_int )c[ i ], Qxtra );
+        silk_assert( silk_abs(cn[i]) <= ( silk_int16_MAX + 1 ) ); /* Check that silk_SMLAWB can be used */
+    }
+    lshifts -= Qxtra;
+
+    /* Compute wxx - 2 * wXx * c */
+    tmp = 0;
+    for( i = 0; i < D; i++ ) {
+        tmp = silk_SMLAWB( tmp, wXx[ i ], cn[ i ] );
+    }
+    nrg = silk_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 = silk_SMLAWB( tmp, pRow[ j ], cn[ j ] );
+        }
+        tmp  = silk_SMLAWB( tmp,  silk_RSHIFT( pRow[ i ], 1 ), cn[ i ] );
+        tmp2 = silk_SMLAWB( tmp2, tmp,                        cn[ i ] );
+    }
+    nrg = silk_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 > silk_RSHIFT( silk_int32_MAX, lshifts + 2 ) ) {
+        nrg = silk_int32_MAX >> 1;
+    } else {
+        nrg = silk_LSHIFT( nrg, lshifts + 1 );                           /* Q0 */
+    }
+    return nrg;
+
+}