1 #ifndef __RESAMPLER_SINC_CONV_FILTER_THREE_TO_ONE_INT16_H__

     2 #define __RESAMPLER_SINC_CONV_FILTER_THREE_TO_ONE_INT16_H__

     3 /*

     4 * Copyright (c) 2010 Ixonos Plc.

     5 * All rights reserved.

     6 * This component and the accompanying materials are made available

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

     8 * which accompanies this distribution, and is available

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

    10 *

    11 * Initial Contributors:

    12 * Nokia Corporation - Initial contribution

    13 *

    14 * Contributors:

    15 * Ixonos Plc

    16 *

    17 * Description:

    18 *

    19 */

    20 

    21 

    22 #include "resampler_common_defs.h"

    23 #include "resampler_data_types.h"

    24 

    25 static FORCEINLINE int32 

    26 RESAMPLER_SincConvFilterThreeToOneInt16(const int16 *signalBuf, 

    27                                   const int16 *filterPtr,

    28                                   int length)

    29 {

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

    31     

    32     const int16 *bufferPtr1 = signalBuf - 1; 

    33     const int16 *bufferPtr2 = signalBuf + 1;

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

    35     {

    36         // Calculate the filter. 

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

    38         int16 coeff = *filterPtr++;

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

    40         bufferPtr1--;

    41         bufferPtr2++;

    42 	}

    43 

    44     return newSample;

    45 }

    46 

    47 #endif /* __RESAMPLER_SINC_CONV_FILTER_THREE_TO_ONE_INT16_H__ */