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