1 #ifndef __RESAMPLER_SINC_CONV_ONE_TO_TWO_INT16_INL__

     2 #define __RESAMPLER_SINC_CONV_ONE_TO_TWO_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 

    27 /* Note! This version assumes the number of filter coefficients is 

    28  * divisible by four.

    29  */

    30 static FORCEINLINE int32 

    31 RESAMPLER_SincConvOneToTwoFilterInt16(const int16 *signalBuf, 

    32                                 const int16 *coeffBuf,

    33                                 int length)

    34 {

    35     int32 newSample = 0;

    36     const int16 *bufferPtr1 = signalBuf;

    37     const int16 *bufferPtr2 = signalBuf - 1;

    38 

    39     (void)length;

    40     // Calculate the filter. 

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

    42     for (int k = length; k>0; k-=4)

    43     {

    44         newSample += (int32)(*coeffBuf  ) * (*bufferPtr1++);

    45         newSample += (int32)(*coeffBuf++) * (*bufferPtr2--);

    46         newSample += (int32)(*coeffBuf  ) * (*bufferPtr1++);

    47         newSample += (int32)(*coeffBuf++) * (*bufferPtr2--);

    48         newSample += (int32)(*coeffBuf  ) * (*bufferPtr1++);

    49         newSample += (int32)(*coeffBuf++) * (*bufferPtr2--);

    50         newSample += (int32)(*coeffBuf  ) * (*bufferPtr1++);

    51         newSample += (int32)(*coeffBuf++) * (*bufferPtr2--);

    52     }

    53 

    54     return newSample;

    55 }

    56 

    57 #endif /* __RESAMPLER_SINC_CONV_ONE_TO_TWO_INT16_INL__ */