96 lines
4.7 KiB
C
96 lines
4.7 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_FIX.h"
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#define QC 10
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#define QS 14
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#if defined(MIPSr1_ASM)
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#include "mips/warped_autocorrelation_FIX_mipsr1.h"
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#endif
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#ifndef OVERRIDE_silk_warped_autocorrelation_FIX
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/* Autocorrelations for a warped frequency axis */
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void silk_warped_autocorrelation_FIX(
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opus_int32 *corr, /* O Result [order + 1] */
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opus_int *scale, /* O Scaling of the correlation vector */
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const opus_int16 *input, /* I Input data to correlate */
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const opus_int warping_Q16, /* I Warping coefficient */
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const opus_int length, /* I Length of input */
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const opus_int order /* I Correlation order (even) */
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)
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{
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opus_int n, i, lsh;
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opus_int32 tmp1_QS, tmp2_QS;
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opus_int32 state_QS[ MAX_SHAPE_LPC_ORDER + 1 ] = { 0 };
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opus_int64 corr_QC[ MAX_SHAPE_LPC_ORDER + 1 ] = { 0 };
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/* Order must be even */
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silk_assert( ( order & 1 ) == 0 );
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silk_assert( 2 * QS - QC >= 0 );
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/* Loop over samples */
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for( n = 0; n < length; n++ ) {
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tmp1_QS = silk_LSHIFT32( (opus_int32)input[ n ], QS );
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/* Loop over allpass sections */
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for( i = 0; i < order; i += 2 ) {
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/* Output of allpass section */
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tmp2_QS = silk_SMLAWB( state_QS[ i ], state_QS[ i + 1 ] - tmp1_QS, warping_Q16 );
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state_QS[ i ] = tmp1_QS;
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corr_QC[ i ] += silk_RSHIFT64( silk_SMULL( tmp1_QS, state_QS[ 0 ] ), 2 * QS - QC );
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/* Output of allpass section */
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tmp1_QS = silk_SMLAWB( state_QS[ i + 1 ], state_QS[ i + 2 ] - tmp2_QS, warping_Q16 );
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state_QS[ i + 1 ] = tmp2_QS;
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corr_QC[ i + 1 ] += silk_RSHIFT64( silk_SMULL( tmp2_QS, state_QS[ 0 ] ), 2 * QS - QC );
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}
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state_QS[ order ] = tmp1_QS;
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corr_QC[ order ] += silk_RSHIFT64( silk_SMULL( tmp1_QS, state_QS[ 0 ] ), 2 * QS - QC );
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}
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lsh = silk_CLZ64( corr_QC[ 0 ] ) - 35;
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lsh = silk_LIMIT( lsh, -12 - QC, 30 - QC );
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*scale = -( QC + lsh );
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silk_assert( *scale >= -30 && *scale <= 12 );
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if( lsh >= 0 ) {
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for( i = 0; i < order + 1; i++ ) {
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corr[ i ] = (opus_int32)silk_CHECK_FIT32( silk_LSHIFT64( corr_QC[ i ], lsh ) );
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}
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} else {
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for( i = 0; i < order + 1; i++ ) {
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corr[ i ] = (opus_int32)silk_CHECK_FIT32( silk_RSHIFT64( corr_QC[ i ], -lsh ) );
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}
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}
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silk_assert( corr_QC[ 0 ] >= 0 ); /* If breaking, decrease QC*/
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}
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#endif /* OVERRIDE_silk_warped_autocorrelation_FIX */
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