michael@0: /***********************************************************************
michael@0: Copyright (c) 2006-2011, Skype Limited. All rights reserved.
michael@0: Redistribution and use in source and binary forms, with or without
michael@0: modification, are permitted provided that the following conditions
michael@0: are met:
michael@0: - Redistributions of source code must retain the above copyright notice,
michael@0: this list of conditions and the following disclaimer.
michael@0: - Redistributions in binary form must reproduce the above copyright
michael@0: notice, this list of conditions and the following disclaimer in the
michael@0: documentation and/or other materials provided with the distribution.
michael@0: - Neither the name of Internet Society, IETF or IETF Trust, nor the
michael@0: names of specific contributors, may be used to endorse or promote
michael@0: products derived from this software without specific prior written
michael@0: permission.
michael@0: THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
michael@0: AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
michael@0: IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
michael@0: ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
michael@0: LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
michael@0: CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
michael@0: SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
michael@0: INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
michael@0: CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
michael@0: ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
michael@0: POSSIBILITY OF SUCH DAMAGE.
michael@0: ***********************************************************************/
michael@0: 
michael@0: #ifdef HAVE_CONFIG_H
michael@0: #include "config.h"
michael@0: #endif
michael@0: 
michael@0: #include "main.h"
michael@0: 
michael@0: /* Compute quantization errors for an LPC_order element input vector for a VQ codebook */
michael@0: void silk_NLSF_VQ(
michael@0:     opus_int32                  err_Q26[],                      /* O    Quantization errors [K]                     */
michael@0:     const opus_int16            in_Q15[],                       /* I    Input vectors to be quantized [LPC_order]   */
michael@0:     const opus_uint8            pCB_Q8[],                       /* I    Codebook vectors [K*LPC_order]              */
michael@0:     const opus_int              K,                              /* I    Number of codebook vectors                  */
michael@0:     const opus_int              LPC_order                       /* I    Number of LPCs                              */
michael@0: )
michael@0: {
michael@0:     opus_int        i, m;
michael@0:     opus_int32      diff_Q15, sum_error_Q30, sum_error_Q26;
michael@0: 
michael@0:     silk_assert( LPC_order <= 16 );
michael@0:     silk_assert( ( LPC_order & 1 ) == 0 );
michael@0: 
michael@0:     /* Loop over codebook */
michael@0:     for( i = 0; i < K; i++ ) {
michael@0:         sum_error_Q26 = 0;
michael@0:         for( m = 0; m < LPC_order; m += 2 ) {
michael@0:             /* Compute weighted squared quantization error for index m */
michael@0:             diff_Q15 = silk_SUB_LSHIFT32( in_Q15[ m ], (opus_int32)*pCB_Q8++, 7 ); /* range: [ -32767 : 32767 ]*/
michael@0:             sum_error_Q30 = silk_SMULBB( diff_Q15, diff_Q15 );
michael@0: 
michael@0:             /* Compute weighted squared quantization error for index m + 1 */
michael@0:             diff_Q15 = silk_SUB_LSHIFT32( in_Q15[m + 1], (opus_int32)*pCB_Q8++, 7 ); /* range: [ -32767 : 32767 ]*/
michael@0:             sum_error_Q30 = silk_SMLABB( sum_error_Q30, diff_Q15, diff_Q15 );
michael@0: 
michael@0:             sum_error_Q26 = silk_ADD_RSHIFT32( sum_error_Q26, sum_error_Q30, 4 );
michael@0: 
michael@0:             silk_assert( sum_error_Q26 >= 0 );
michael@0:             silk_assert( sum_error_Q30 >= 0 );
michael@0:         }
michael@0:         err_Q26[ i ] = sum_error_Q26;
michael@0:     }
michael@0: }