#ifndef __RESAMPLER_SINC_CONV_FILTER_THREE_TO_ONE_INT16_H__

#define __RESAMPLER_SINC_CONV_FILTER_THREE_TO_ONE_INT16_H__

/*

* Copyright (c) 2010 Ixonos Plc.

* All rights reserved.

* This component and the accompanying materials are made available

* under the terms of the "Eclipse Public License v1.0"

* which accompanies this distribution, and is available

* at the URL "http://www.eclipse.org/legal/epl-v10.html".

*

* Initial Contributors:

* Nokia Corporation - Initial contribution

*

* Contributors:

* Ixonos Plc

*

* Description:

*

*/

#include "resampler_common_defs.h"

#include "resampler_data_types.h"

static FORCEINLINE int32 

RESAMPLER_SincConvFilterThreeToOneInt16(const int16 *signalBuf, 

                                  const int16 *filterPtr,

                                  int length)

{

    int32 newSample((int32)(*filterPtr++) * signalBuf[0]);

    const int16 *bufferPtr1 = signalBuf - 1; 

    const int16 *bufferPtr2 = signalBuf + 1;

    for (int l = length - 1; l > 0 ; l--)

    {

        // Calculate the filter. 

        // Keep newSample in s1.30 format to reduce rounding errors

        int16 coeff = *filterPtr++;

        newSample += (int32)coeff * (*bufferPtr1) + (int32)coeff * (*bufferPtr2);

        bufferPtr1--;

        bufferPtr2++;

	}

    return newSample;

}

#endif /* __RESAMPLER_SINC_CONV_FILTER_THREE_TO_ONE_INT16_H__ */