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
cannam@154: CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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.h"
cannam@154: 
cannam@154: /* Compute quantization errors for an LPC_order element input vector for a VQ codebook */
cannam@154: void silk_NLSF_VQ(
cannam@154:     opus_int32                  err_Q24[],                      /* O    Quantization errors [K]                     */
cannam@154:     const opus_int16            in_Q15[],                       /* I    Input vectors to be quantized [LPC_order]   */
cannam@154:     const opus_uint8            pCB_Q8[],                       /* I    Codebook vectors [K*LPC_order]              */
cannam@154:     const opus_int16            pWght_Q9[],                     /* I    Codebook weights [K*LPC_order]              */
cannam@154:     const opus_int              K,                              /* I    Number of codebook vectors                  */
cannam@154:     const opus_int              LPC_order                       /* I    Number of LPCs                              */
cannam@154: )
cannam@154: {
cannam@154:     opus_int         i, m;
cannam@154:     opus_int32       diff_Q15, diffw_Q24, sum_error_Q24, pred_Q24;
cannam@154:     const opus_int16 *w_Q9_ptr;
cannam@154:     const opus_uint8 *cb_Q8_ptr;
cannam@154: 
cannam@154:     celt_assert( ( LPC_order & 1 ) == 0 );
cannam@154: 
cannam@154:     /* Loop over codebook */
cannam@154:     cb_Q8_ptr = pCB_Q8;
cannam@154:     w_Q9_ptr = pWght_Q9;
cannam@154:     for( i = 0; i < K; i++ ) {
cannam@154:         sum_error_Q24 = 0;
cannam@154:         pred_Q24 = 0;
cannam@154:         for( m = LPC_order-2; m >= 0; m -= 2 ) {
cannam@154:             /* Compute weighted absolute predictive quantization error for index m + 1 */
cannam@154:             diff_Q15 = silk_SUB_LSHIFT32( in_Q15[ m + 1 ], (opus_int32)cb_Q8_ptr[ m + 1 ], 7 ); /* range: [ -32767 : 32767 ]*/
cannam@154:             diffw_Q24 = silk_SMULBB( diff_Q15, w_Q9_ptr[ m + 1 ] );
cannam@154:             sum_error_Q24 = silk_ADD32( sum_error_Q24, silk_abs( silk_SUB_RSHIFT32( diffw_Q24, pred_Q24, 1 ) ) );
cannam@154:             pred_Q24 = diffw_Q24;
cannam@154: 
cannam@154:             /* Compute weighted absolute predictive quantization error for index m */
cannam@154:             diff_Q15 = silk_SUB_LSHIFT32( in_Q15[ m ], (opus_int32)cb_Q8_ptr[ m ], 7 ); /* range: [ -32767 : 32767 ]*/
cannam@154:             diffw_Q24 = silk_SMULBB( diff_Q15, w_Q9_ptr[ m ] );
cannam@154:             sum_error_Q24 = silk_ADD32( sum_error_Q24, silk_abs( silk_SUB_RSHIFT32( diffw_Q24, pred_Q24, 1 ) ) );
cannam@154:             pred_Q24 = diffw_Q24;
cannam@154: 
cannam@154:             silk_assert( sum_error_Q24 >= 0 );
cannam@154:         }
cannam@154:         err_Q24[ i ] = sum_error_Q24;
cannam@154:         cb_Q8_ptr += LPC_order;
cannam@154:         w_Q9_ptr += LPC_order;
cannam@154:     }
cannam@154: }