1 #ifndef __RESAMPLER_SINC_CONV_FILTER_INT16_H__

     2 #define __RESAMPLER_SINC_CONV_FILTER_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_SincConvFilterInt16(const int16 *signalBuf, 

    27                         const int16 *filterPtr1,

    28                         const int16 *filterPtr2,

    29                         int length)

    30 {

    31 

    32     int32 newSample(0);

    33     const int16 *bufferPtr1 = signalBuf; 

    34     const int16 *bufferPtr2 = signalBuf+1;     

    35     // Calculate the filter. 

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

    37     for (int l = length; l >0 ; l-=4)

    38     {

    39         newSample += (int32)(*filterPtr1++) * (*bufferPtr1--) + (int32)(*filterPtr2++) * (*bufferPtr2++);

    40         newSample += (int32)(*filterPtr1++) * (*bufferPtr1--) + (int32)(*filterPtr2++) * (*bufferPtr2++);

    41         newSample += (int32)(*filterPtr1++) * (*bufferPtr1--) + (int32)(*filterPtr2++) * (*bufferPtr2++);

    42         newSample += (int32)(*filterPtr1++) * (*bufferPtr1--) + (int32)(*filterPtr2++) * (*bufferPtr2++);

    43     }

    44     return newSample;

    45 }

    46 

    47 #endif /* __RESAMPLER_SINC_CONV_FILTER_INT16_H__ */