78 lines
3.8 KiB
C
78 lines
3.8 KiB
C
/***********************************************************************
|
|
Copyright (c) 2006-2011, Skype Limited. All rights reserved.
|
|
Redistribution and use in source and binary forms, with or without
|
|
modification, 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 Internet Society, IETF or IETF Trust, nor the
|
|
names of specific contributors, may be used to endorse or promote
|
|
products derived from this software without specific prior written
|
|
permission.
|
|
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.
|
|
***********************************************************************/
|
|
#include "opus/opus_config.h"
|
|
|
|
#include "opus/silk/define.h"
|
|
#include "opus/silk/SigProc_FIX.h"
|
|
|
|
/*
|
|
R. Laroia, N. Phamdo and N. Farvardin, "Robust and Efficient Quantization of Speech LSP
|
|
Parameters Using Structured Vector Quantization", Proc. IEEE Int. Conf. Acoust., Speech,
|
|
Signal Processing, pp. 641-644, 1991.
|
|
*/
|
|
|
|
/* Laroia low complexity NLSF weights */
|
|
void silk_NLSF_VQ_weights_laroia(
|
|
opus_int16 *pNLSFW_Q_OUT, /* O Pointer to input vector weights [D] */
|
|
const opus_int16 *pNLSF_Q15, /* I Pointer to input vector [D] */
|
|
const opus_int D /* I Input vector dimension (even) */
|
|
)
|
|
{
|
|
opus_int k;
|
|
opus_int32 tmp1_int, tmp2_int;
|
|
|
|
silk_assert( D > 0 );
|
|
silk_assert( ( D & 1 ) == 0 );
|
|
|
|
/* First value */
|
|
tmp1_int = silk_max_int( pNLSF_Q15[ 0 ], 1 );
|
|
tmp1_int = silk_DIV32_16( (opus_int32)1 << ( 15 + NLSF_W_Q ), tmp1_int );
|
|
tmp2_int = silk_max_int( pNLSF_Q15[ 1 ] - pNLSF_Q15[ 0 ], 1 );
|
|
tmp2_int = silk_DIV32_16( (opus_int32)1 << ( 15 + NLSF_W_Q ), tmp2_int );
|
|
pNLSFW_Q_OUT[ 0 ] = (opus_int16)silk_min_int( tmp1_int + tmp2_int, silk_int16_MAX );
|
|
silk_assert( pNLSFW_Q_OUT[ 0 ] > 0 );
|
|
|
|
/* Main loop */
|
|
for( k = 1; k < D - 1; k += 2 ) {
|
|
tmp1_int = silk_max_int( pNLSF_Q15[ k + 1 ] - pNLSF_Q15[ k ], 1 );
|
|
tmp1_int = silk_DIV32_16( (opus_int32)1 << ( 15 + NLSF_W_Q ), tmp1_int );
|
|
pNLSFW_Q_OUT[ k ] = (opus_int16)silk_min_int( tmp1_int + tmp2_int, silk_int16_MAX );
|
|
silk_assert( pNLSFW_Q_OUT[ k ] > 0 );
|
|
|
|
tmp2_int = silk_max_int( pNLSF_Q15[ k + 2 ] - pNLSF_Q15[ k + 1 ], 1 );
|
|
tmp2_int = silk_DIV32_16( (opus_int32)1 << ( 15 + NLSF_W_Q ), tmp2_int );
|
|
pNLSFW_Q_OUT[ k + 1 ] = (opus_int16)silk_min_int( tmp1_int + tmp2_int, silk_int16_MAX );
|
|
silk_assert( pNLSFW_Q_OUT[ k + 1 ] > 0 );
|
|
}
|
|
|
|
/* Last value */
|
|
tmp1_int = silk_max_int( ( 1 << 15 ) - pNLSF_Q15[ D - 1 ], 1 );
|
|
tmp1_int = silk_DIV32_16( (opus_int32)1 << ( 15 + NLSF_W_Q ), tmp1_int );
|
|
pNLSFW_Q_OUT[ D - 1 ] = (opus_int16)silk_min_int( tmp1_int + tmp2_int, silk_int16_MAX );
|
|
silk_assert( pNLSFW_Q_OUT[ D - 1 ] > 0 );
|
|
}
|