1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/media/libopus/silk/fixed/warped_autocorrelation_FIX.c Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,88 @@
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_FIX.h"
1.36 +
1.37 +#define QC 10
1.38 +#define QS 14
1.39 +
1.40 +/* Autocorrelations for a warped frequency axis */
1.41 +void silk_warped_autocorrelation_FIX(
1.42 + opus_int32 *corr, /* O Result [order + 1] */
1.43 + opus_int *scale, /* O Scaling of the correlation vector */
1.44 + const opus_int16 *input, /* I Input data to correlate */
1.45 + const opus_int warping_Q16, /* I Warping coefficient */
1.46 + const opus_int length, /* I Length of input */
1.47 + const opus_int order /* I Correlation order (even) */
1.48 +)
1.49 +{
1.50 + opus_int n, i, lsh;
1.51 + opus_int32 tmp1_QS, tmp2_QS;
1.52 + opus_int32 state_QS[ MAX_SHAPE_LPC_ORDER + 1 ] = { 0 };
1.53 + opus_int64 corr_QC[ MAX_SHAPE_LPC_ORDER + 1 ] = { 0 };
1.54 +
1.55 + /* Order must be even */
1.56 + silk_assert( ( order & 1 ) == 0 );
1.57 + silk_assert( 2 * QS - QC >= 0 );
1.58 +
1.59 + /* Loop over samples */
1.60 + for( n = 0; n < length; n++ ) {
1.61 + tmp1_QS = silk_LSHIFT32( (opus_int32)input[ n ], QS );
1.62 + /* Loop over allpass sections */
1.63 + for( i = 0; i < order; i += 2 ) {
1.64 + /* Output of allpass section */
1.65 + tmp2_QS = silk_SMLAWB( state_QS[ i ], state_QS[ i + 1 ] - tmp1_QS, warping_Q16 );
1.66 + state_QS[ i ] = tmp1_QS;
1.67 + corr_QC[ i ] += silk_RSHIFT64( silk_SMULL( tmp1_QS, state_QS[ 0 ] ), 2 * QS - QC );
1.68 + /* Output of allpass section */
1.69 + tmp1_QS = silk_SMLAWB( state_QS[ i + 1 ], state_QS[ i + 2 ] - tmp2_QS, warping_Q16 );
1.70 + state_QS[ i + 1 ] = tmp2_QS;
1.71 + corr_QC[ i + 1 ] += silk_RSHIFT64( silk_SMULL( tmp2_QS, state_QS[ 0 ] ), 2 * QS - QC );
1.72 + }
1.73 + state_QS[ order ] = tmp1_QS;
1.74 + corr_QC[ order ] += silk_RSHIFT64( silk_SMULL( tmp1_QS, state_QS[ 0 ] ), 2 * QS - QC );
1.75 + }
1.76 +
1.77 + lsh = silk_CLZ64( corr_QC[ 0 ] ) - 35;
1.78 + lsh = silk_LIMIT( lsh, -12 - QC, 30 - QC );
1.79 + *scale = -( QC + lsh );
1.80 + silk_assert( *scale >= -30 && *scale <= 12 );
1.81 + if( lsh >= 0 ) {
1.82 + for( i = 0; i < order + 1; i++ ) {
1.83 + corr[ i ] = (opus_int32)silk_CHECK_FIT32( silk_LSHIFT64( corr_QC[ i ], lsh ) );
1.84 + }
1.85 + } else {
1.86 + for( i = 0; i < order + 1; i++ ) {
1.87 + corr[ i ] = (opus_int32)silk_CHECK_FIT32( silk_RSHIFT64( corr_QC[ i ], -lsh ) );
1.88 + }
1.89 + }
1.90 + silk_assert( corr_QC[ 0 ] >= 0 ); /* If breaking, decrease QC*/
1.91 +}
