1 #ifndef __RESAMPLER_SINC_CONV_TWO_TO_THREE_INT16_INL__

     2 #define __RESAMPLER_SINC_CONV_TWO_TO_THREE_INT16_INL__

     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 

    26 static FORCEINLINE int32 

    27 RESAMPLER_SincConvTwoToThreeFilterInt16(const int16 *signalBuf, 

    28                                 const int16 *filterPtr1,

    29                                 const int16 *filterPtr2,

    30                                 int length)

    31 {

    32 

    33     int32 newSample(0);

    34     const int16 *bufferPtr1 = signalBuf; 

    35     const int16 *bufferPtr2 = signalBuf+1;     

    36     // Calculate the filter. 

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

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

    39     {

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

    44     }

    45     return newSample;

    46 }

    47 

    48 

    49 #endif /* __RESAMPLER_SINC_CONV_ONE_TO_TWO_INT16_INL__ */