1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/media/libopus/silk/NLSF_VQ.c Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,68 @@
1.4 +/***********************************************************************
1.5 +Copyright (c) 2006-2011, Skype Limited. All rights reserved.
1.6 +Redistribution and use in source and binary forms, with or without
1.7 +modification, are permitted provided that the following conditions
1.8 +are met:
1.9 +- Redistributions of source code must retain the above copyright notice,
1.10 +this list of conditions and the following disclaimer.
1.11 +- Redistributions in binary form must reproduce the above copyright
1.12 +notice, this list of conditions and the following disclaimer in the
1.13 +documentation and/or other materials provided with the distribution.
1.14 +- Neither the name of Internet Society, IETF or IETF Trust, nor the
1.15 +names of specific contributors, may be used to endorse or promote
1.16 +products derived from this software without specific prior written
1.17 +permission.
1.18 +THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
1.19 +AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
1.20 +IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
1.21 +ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
1.22 +LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
1.23 +CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
1.24 +SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
1.25 +INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
1.26 +CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
1.27 +ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
1.28 +POSSIBILITY OF SUCH DAMAGE.
1.29 +***********************************************************************/
1.30 +
1.31 +#ifdef HAVE_CONFIG_H
1.32 +#include "config.h"
1.33 +#endif
1.34 +
1.35 +#include "main.h"
1.36 +
1.37 +/* Compute quantization errors for an LPC_order element input vector for a VQ codebook */
1.38 +void silk_NLSF_VQ(
1.39 + opus_int32 err_Q26[], /* O Quantization errors [K] */
1.40 + const opus_int16 in_Q15[], /* I Input vectors to be quantized [LPC_order] */
1.41 + const opus_uint8 pCB_Q8[], /* I Codebook vectors [K*LPC_order] */
1.42 + const opus_int K, /* I Number of codebook vectors */
1.43 + const opus_int LPC_order /* I Number of LPCs */
1.44 +)
1.45 +{
1.46 + opus_int i, m;
1.47 + opus_int32 diff_Q15, sum_error_Q30, sum_error_Q26;
1.48 +
1.49 + silk_assert( LPC_order <= 16 );
1.50 + silk_assert( ( LPC_order & 1 ) == 0 );
1.51 +
1.52 + /* Loop over codebook */
1.53 + for( i = 0; i < K; i++ ) {
1.54 + sum_error_Q26 = 0;
1.55 + for( m = 0; m < LPC_order; m += 2 ) {
1.56 + /* Compute weighted squared quantization error for index m */
1.57 + diff_Q15 = silk_SUB_LSHIFT32( in_Q15[ m ], (opus_int32)*pCB_Q8++, 7 ); /* range: [ -32767 : 32767 ]*/
1.58 + sum_error_Q30 = silk_SMULBB( diff_Q15, diff_Q15 );
1.59 +
1.60 + /* Compute weighted squared quantization error for index m + 1 */
1.61 + diff_Q15 = silk_SUB_LSHIFT32( in_Q15[m + 1], (opus_int32)*pCB_Q8++, 7 ); /* range: [ -32767 : 32767 ]*/
1.62 + sum_error_Q30 = silk_SMLABB( sum_error_Q30, diff_Q15, diff_Q15 );
1.63 +
1.64 + sum_error_Q26 = silk_ADD_RSHIFT32( sum_error_Q26, sum_error_Q30, 4 );
1.65 +
1.66 + silk_assert( sum_error_Q26 >= 0 );
1.67 + silk_assert( sum_error_Q30 >= 0 );
1.68 + }
1.69 + err_Q26[ i ] = sum_error_Q26;
1.70 + }
1.71 +}
