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+/***********************************************************************
+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
+
+#include "main.h"
+
+/* Entropy constrained matrix-weighted VQ, hard-coded to 5-element vectors, for a single input data vector */
+void silk_VQ_WMat_EC_c(
+ opus_int8 *ind, /* O index of best codebook vector */
+ opus_int32 *res_nrg_Q15, /* O best residual energy */
+ opus_int32 *rate_dist_Q8, /* O best total bitrate */
+ opus_int *gain_Q7, /* O sum of absolute LTP coefficients */
+ const opus_int32 *XX_Q17, /* I correlation matrix */
+ const opus_int32 *xX_Q17, /* I correlation vector */
+ const opus_int8 *cb_Q7, /* I codebook */
+ const opus_uint8 *cb_gain_Q7, /* I codebook effective gain */
+ const opus_uint8 *cl_Q5, /* I code length for each codebook vector */
+ const opus_int subfr_len, /* I number of samples per subframe */
+ const opus_int32 max_gain_Q7, /* I maximum sum of absolute LTP coefficients */
+ const opus_int L /* I number of vectors in codebook */
+)
+{
+ opus_int k, gain_tmp_Q7;
+ const opus_int8 *cb_row_Q7;
+ opus_int32 neg_xX_Q24[ 5 ];
+ opus_int32 sum1_Q15, sum2_Q24;
+ opus_int32 bits_res_Q8, bits_tot_Q8;
+
+ /* Negate and convert to new Q domain */
+ neg_xX_Q24[ 0 ] = -silk_LSHIFT32( xX_Q17[ 0 ], 7 );
+ neg_xX_Q24[ 1 ] = -silk_LSHIFT32( xX_Q17[ 1 ], 7 );
+ neg_xX_Q24[ 2 ] = -silk_LSHIFT32( xX_Q17[ 2 ], 7 );
+ neg_xX_Q24[ 3 ] = -silk_LSHIFT32( xX_Q17[ 3 ], 7 );
+ neg_xX_Q24[ 4 ] = -silk_LSHIFT32( xX_Q17[ 4 ], 7 );
+
+ /* Loop over codebook */
+ *rate_dist_Q8 = silk_int32_MAX;
+ *res_nrg_Q15 = silk_int32_MAX;
+ cb_row_Q7 = cb_Q7;
+ /* In things go really bad, at least *ind is set to something safe. */
+ *ind = 0;
+ for( k = 0; k < L; k++ ) {
+ opus_int32 penalty;
+ gain_tmp_Q7 = cb_gain_Q7[k];
+ /* Weighted rate */
+ /* Quantization error: 1 - 2 * xX * cb + cb' * XX * cb */
+ sum1_Q15 = SILK_FIX_CONST( 1.001, 15 );
+
+ /* Penalty for too large gain */
+ penalty = silk_LSHIFT32( silk_max( silk_SUB32( gain_tmp_Q7, max_gain_Q7 ), 0 ), 11 );
+
+ /* first row of XX_Q17 */
+ sum2_Q24 = silk_MLA( neg_xX_Q24[ 0 ], XX_Q17[ 1 ], cb_row_Q7[ 1 ] );
+ sum2_Q24 = silk_MLA( sum2_Q24, XX_Q17[ 2 ], cb_row_Q7[ 2 ] );
+ sum2_Q24 = silk_MLA( sum2_Q24, XX_Q17[ 3 ], cb_row_Q7[ 3 ] );
+ sum2_Q24 = silk_MLA( sum2_Q24, XX_Q17[ 4 ], cb_row_Q7[ 4 ] );
+ sum2_Q24 = silk_LSHIFT32( sum2_Q24, 1 );
+ sum2_Q24 = silk_MLA( sum2_Q24, XX_Q17[ 0 ], cb_row_Q7[ 0 ] );
+ sum1_Q15 = silk_SMLAWB( sum1_Q15, sum2_Q24, cb_row_Q7[ 0 ] );
+
+ /* second row of XX_Q17 */
+ sum2_Q24 = silk_MLA( neg_xX_Q24[ 1 ], XX_Q17[ 7 ], cb_row_Q7[ 2 ] );
+ sum2_Q24 = silk_MLA( sum2_Q24, XX_Q17[ 8 ], cb_row_Q7[ 3 ] );
+ sum2_Q24 = silk_MLA( sum2_Q24, XX_Q17[ 9 ], cb_row_Q7[ 4 ] );
+ sum2_Q24 = silk_LSHIFT32( sum2_Q24, 1 );
+ sum2_Q24 = silk_MLA( sum2_Q24, XX_Q17[ 6 ], cb_row_Q7[ 1 ] );
+ sum1_Q15 = silk_SMLAWB( sum1_Q15, sum2_Q24, cb_row_Q7[ 1 ] );
+
+ /* third row of XX_Q17 */
+ sum2_Q24 = silk_MLA( neg_xX_Q24[ 2 ], XX_Q17[ 13 ], cb_row_Q7[ 3 ] );
+ sum2_Q24 = silk_MLA( sum2_Q24, XX_Q17[ 14 ], cb_row_Q7[ 4 ] );
+ sum2_Q24 = silk_LSHIFT32( sum2_Q24, 1 );
+ sum2_Q24 = silk_MLA( sum2_Q24, XX_Q17[ 12 ], cb_row_Q7[ 2 ] );
+ sum1_Q15 = silk_SMLAWB( sum1_Q15, sum2_Q24, cb_row_Q7[ 2 ] );
+
+ /* fourth row of XX_Q17 */
+ sum2_Q24 = silk_MLA( neg_xX_Q24[ 3 ], XX_Q17[ 19 ], cb_row_Q7[ 4 ] );
+ sum2_Q24 = silk_LSHIFT32( sum2_Q24, 1 );
+ sum2_Q24 = silk_MLA( sum2_Q24, XX_Q17[ 18 ], cb_row_Q7[ 3 ] );
+ sum1_Q15 = silk_SMLAWB( sum1_Q15, sum2_Q24, cb_row_Q7[ 3 ] );
+
+ /* last row of XX_Q17 */
+ sum2_Q24 = silk_LSHIFT32( neg_xX_Q24[ 4 ], 1 );
+ sum2_Q24 = silk_MLA( sum2_Q24, XX_Q17[ 24 ], cb_row_Q7[ 4 ] );
+ sum1_Q15 = silk_SMLAWB( sum1_Q15, sum2_Q24, cb_row_Q7[ 4 ] );
+
+ /* find best */
+ if( sum1_Q15 >= 0 ) {
+ /* Translate residual energy to bits using high-rate assumption (6 dB ==> 1 bit/sample) */
+ bits_res_Q8 = silk_SMULBB( subfr_len, silk_lin2log( sum1_Q15 + penalty) - (15 << 7) );
+ /* In the following line we reduce the codelength component by half ("-1"); seems to slghtly improve quality */
+ bits_tot_Q8 = silk_ADD_LSHIFT32( bits_res_Q8, cl_Q5[ k ], 3-1 );
+ if( bits_tot_Q8 <= *rate_dist_Q8 ) {
+ *rate_dist_Q8 = bits_tot_Q8;
+ *res_nrg_Q15 = sum1_Q15 + penalty;
+ *ind = (opus_int8)k;
+ *gain_Q7 = gain_tmp_Q7;
+ }
+ }
+
+ /* Go to next cbk vector */
+ cb_row_Q7 += LTP_ORDER;
+ }
+}