1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/media/libopus/silk/float/warped_autocorrelation_FLP.c Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,73 @@
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_FLP.h"
1.36 +
1.37 +/* Autocorrelations for a warped frequency axis */
1.38 +void silk_warped_autocorrelation_FLP(
1.39 + silk_float *corr, /* O Result [order + 1] */
1.40 + const silk_float *input, /* I Input data to correlate */
1.41 + const silk_float warping, /* I Warping coefficient */
1.42 + const opus_int length, /* I Length of input */
1.43 + const opus_int order /* I Correlation order (even) */
1.44 +)
1.45 +{
1.46 + opus_int n, i;
1.47 + double tmp1, tmp2;
1.48 + double state[ MAX_SHAPE_LPC_ORDER + 1 ] = { 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0 };
1.49 + double C[ MAX_SHAPE_LPC_ORDER + 1 ] = { 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0 };
1.50 +
1.51 + /* Order must be even */
1.52 + silk_assert( ( order & 1 ) == 0 );
1.53 +
1.54 + /* Loop over samples */
1.55 + for( n = 0; n < length; n++ ) {
1.56 + tmp1 = input[ n ];
1.57 + /* Loop over allpass sections */
1.58 + for( i = 0; i < order; i += 2 ) {
1.59 + /* Output of allpass section */
1.60 + tmp2 = state[ i ] + warping * ( state[ i + 1 ] - tmp1 );
1.61 + state[ i ] = tmp1;
1.62 + C[ i ] += state[ 0 ] * tmp1;
1.63 + /* Output of allpass section */
1.64 + tmp1 = state[ i + 1 ] + warping * ( state[ i + 2 ] - tmp2 );
1.65 + state[ i + 1 ] = tmp2;
1.66 + C[ i + 1 ] += state[ 0 ] * tmp2;
1.67 + }
1.68 + state[ order ] = tmp1;
1.69 + C[ order ] += state[ 0 ] * tmp1;
1.70 + }
1.71 +
1.72 + /* Copy correlations in silk_float output format */
1.73 + for( i = 0; i < order + 1; i++ ) {
1.74 + corr[ i ] = ( silk_float )C[ i ];
1.75 + }
1.76 +}
