godot/thirdparty/opus/silk/fixed/k2a_Q16_FIX.c

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

#include "SigProc_FIX.h"

/* Step up function, converts reflection coefficients to prediction coefficients */
void silk_k2a_Q16(
    opus_int32                  *A_Q24,             /* O    Prediction coefficients [order] Q24                         */
    const opus_int32            *rc_Q16,            /* I    Reflection coefficients [order] Q16                         */
    const opus_int32            order               /* I    Prediction order                                            */
)
{
    opus_int   k, n;
    opus_int32 Atmp[ SILK_MAX_ORDER_LPC ];

    for( k = 0; k < order; k++ ) {
        for( n = 0; n < k; n++ ) {
            Atmp[ n ] = A_Q24[ n ];
        }
        for( n = 0; n < k; n++ ) {
            A_Q24[ n ] = silk_SMLAWW( A_Q24[ n ], Atmp[ k - n - 1 ], rc_Q16[ k ] );
        }
        A_Q24[ k ] = -silk_LSHIFT( rc_Q16[ k ], 8 );
    }
}