76 lines
3.9 KiB
C
76 lines
3.9 KiB
C
/***********************************************************************
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Copyright (c) 2006-2011, Skype Limited. All rights reserved.
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions
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are met:
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- Redistributions of source code must retain the above copyright notice,
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this list of conditions and the following disclaimer.
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- Redistributions in binary form must reproduce the above copyright
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notice, this list of conditions and the following disclaimer in the
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documentation and/or other materials provided with the distribution.
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- Neither the name of Internet Society, IETF or IETF Trust, nor the
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names of specific contributors, may be used to endorse or promote
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products derived from this software without specific prior written
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permission.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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POSSIBILITY OF SUCH DAMAGE.
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***********************************************************************/
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include "main.h"
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/* Compute quantization errors for an LPC_order element input vector for a VQ codebook */
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void silk_NLSF_VQ(
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opus_int32 err_Q24[], /* O Quantization errors [K] */
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const opus_int16 in_Q15[], /* I Input vectors to be quantized [LPC_order] */
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const opus_uint8 pCB_Q8[], /* I Codebook vectors [K*LPC_order] */
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const opus_int16 pWght_Q9[], /* I Codebook weights [K*LPC_order] */
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const opus_int K, /* I Number of codebook vectors */
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const opus_int LPC_order /* I Number of LPCs */
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)
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{
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opus_int i, m;
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opus_int32 diff_Q15, diffw_Q24, sum_error_Q24, pred_Q24;
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const opus_int16 *w_Q9_ptr;
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const opus_uint8 *cb_Q8_ptr;
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celt_assert( ( LPC_order & 1 ) == 0 );
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/* Loop over codebook */
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cb_Q8_ptr = pCB_Q8;
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w_Q9_ptr = pWght_Q9;
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for( i = 0; i < K; i++ ) {
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sum_error_Q24 = 0;
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pred_Q24 = 0;
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for( m = LPC_order-2; m >= 0; m -= 2 ) {
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/* Compute weighted absolute predictive quantization error for index m + 1 */
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diff_Q15 = silk_SUB_LSHIFT32( in_Q15[ m + 1 ], (opus_int32)cb_Q8_ptr[ m + 1 ], 7 ); /* range: [ -32767 : 32767 ]*/
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diffw_Q24 = silk_SMULBB( diff_Q15, w_Q9_ptr[ m + 1 ] );
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sum_error_Q24 = silk_ADD32( sum_error_Q24, silk_abs( silk_SUB_RSHIFT32( diffw_Q24, pred_Q24, 1 ) ) );
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pred_Q24 = diffw_Q24;
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/* Compute weighted absolute predictive quantization error for index m */
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diff_Q15 = silk_SUB_LSHIFT32( in_Q15[ m ], (opus_int32)cb_Q8_ptr[ m ], 7 ); /* range: [ -32767 : 32767 ]*/
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diffw_Q24 = silk_SMULBB( diff_Q15, w_Q9_ptr[ m ] );
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sum_error_Q24 = silk_ADD32( sum_error_Q24, silk_abs( silk_SUB_RSHIFT32( diffw_Q24, pred_Q24, 1 ) ) );
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pred_Q24 = diffw_Q24;
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silk_assert( sum_error_Q24 >= 0 );
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}
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err_Q24[ i ] = sum_error_Q24;
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cb_Q8_ptr += LPC_order;
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w_Q9_ptr += LPC_order;
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}
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}
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