Chris@69: /***********************************************************************
Chris@69: Copyright (c) 2006-2011, Skype Limited. All rights reserved.
Chris@69: Redistribution and use in source and binary forms, with or without
Chris@69: modification, are permitted provided that the following conditions
Chris@69: are met:
Chris@69: - Redistributions of source code must retain the above copyright notice,
Chris@69: this list of conditions and the following disclaimer.
Chris@69: - Redistributions in binary form must reproduce the above copyright
Chris@69: notice, this list of conditions and the following disclaimer in the
Chris@69: documentation and/or other materials provided with the distribution.
Chris@69: - Neither the name of Internet Society, IETF or IETF Trust, nor the
Chris@69: names of specific contributors, may be used to endorse or promote
Chris@69: products derived from this software without specific prior written
Chris@69: permission.
Chris@69: THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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Chris@69: IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
Chris@69: ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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Chris@69: INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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Chris@69: POSSIBILITY OF SUCH DAMAGE.
Chris@69: ***********************************************************************/
Chris@69: 
Chris@69: #ifdef HAVE_CONFIG_H
Chris@69: #include "config.h"
Chris@69: #endif
Chris@69: 
Chris@69: #include "main.h"
Chris@69: 
Chris@69: /* Compute quantization errors for an LPC_order element input vector for a VQ codebook */
Chris@69: void silk_NLSF_VQ(
Chris@69:     opus_int32                  err_Q24[],                      /* O    Quantization errors [K]                     */
Chris@69:     const opus_int16            in_Q15[],                       /* I    Input vectors to be quantized [LPC_order]   */
Chris@69:     const opus_uint8            pCB_Q8[],                       /* I    Codebook vectors [K*LPC_order]              */
Chris@69:     const opus_int16            pWght_Q9[],                     /* I    Codebook weights [K*LPC_order]              */
Chris@69:     const opus_int              K,                              /* I    Number of codebook vectors                  */
Chris@69:     const opus_int              LPC_order                       /* I    Number of LPCs                              */
Chris@69: )
Chris@69: {
Chris@69:     opus_int         i, m;
Chris@69:     opus_int32       diff_Q15, diffw_Q24, sum_error_Q24, pred_Q24;
Chris@69:     const opus_int16 *w_Q9_ptr;
Chris@69:     const opus_uint8 *cb_Q8_ptr;
Chris@69: 
Chris@69:     celt_assert( ( LPC_order & 1 ) == 0 );
Chris@69: 
Chris@69:     /* Loop over codebook */
Chris@69:     cb_Q8_ptr = pCB_Q8;
Chris@69:     w_Q9_ptr = pWght_Q9;
Chris@69:     for( i = 0; i < K; i++ ) {
Chris@69:         sum_error_Q24 = 0;
Chris@69:         pred_Q24 = 0;
Chris@69:         for( m = LPC_order-2; m >= 0; m -= 2 ) {
Chris@69:             /* Compute weighted absolute predictive quantization error for index m + 1 */
Chris@69:             diff_Q15 = silk_SUB_LSHIFT32( in_Q15[ m + 1 ], (opus_int32)cb_Q8_ptr[ m + 1 ], 7 ); /* range: [ -32767 : 32767 ]*/
Chris@69:             diffw_Q24 = silk_SMULBB( diff_Q15, w_Q9_ptr[ m + 1 ] );
Chris@69:             sum_error_Q24 = silk_ADD32( sum_error_Q24, silk_abs( silk_SUB_RSHIFT32( diffw_Q24, pred_Q24, 1 ) ) );
Chris@69:             pred_Q24 = diffw_Q24;
Chris@69: 
Chris@69:             /* Compute weighted absolute predictive quantization error for index m */
Chris@69:             diff_Q15 = silk_SUB_LSHIFT32( in_Q15[ m ], (opus_int32)cb_Q8_ptr[ m ], 7 ); /* range: [ -32767 : 32767 ]*/
Chris@69:             diffw_Q24 = silk_SMULBB( diff_Q15, w_Q9_ptr[ m ] );
Chris@69:             sum_error_Q24 = silk_ADD32( sum_error_Q24, silk_abs( silk_SUB_RSHIFT32( diffw_Q24, pred_Q24, 1 ) ) );
Chris@69:             pred_Q24 = diffw_Q24;
Chris@69: 
Chris@69:             silk_assert( sum_error_Q24 >= 0 );
Chris@69:         }
Chris@69:         err_Q24[ i ] = sum_error_Q24;
Chris@69:         cb_Q8_ptr += LPC_order;
Chris@69:         w_Q9_ptr += LPC_order;
Chris@69:     }
Chris@69: }