IHOLL
/
squeezelite-esp32
mirror of https://github.com/sle118/squeezelite-esp32


			
				
					
						
						
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							/***********************************************************************
Copyright (c) 2006-2011, Skype Limited. All rights reserved.
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are met:
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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
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***********************************************************************/

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#include "SigProc_FLP.h"

/* step up function, converts reflection coefficients to prediction coefficients */
void silk_k2a_FLP(
    silk_float          *A,                 /* O     prediction coefficients [order]                            */
    const silk_float    *rc,                /* I     reflection coefficients [order]                            */
    opus_int32          order               /* I     prediction order                                           */
)
{
    opus_int   k, n;
    silk_float rck, tmp1, tmp2;

    for( k = 0; k < order; k++ ) {
        rck = rc[ k ];
        for( n = 0; n < (k + 1) >> 1; n++ ) {
            tmp1 = A[ n ];
            tmp2 = A[ k - n - 1 ];
            A[ n ]         = tmp1 + tmp2 * rck;
            A[ k - n - 1 ] = tmp2 + tmp1 * rck;
        }
        A[ k ] = -rck;
    }
}