1 #ifndef __RESAMPLER_SINC_CONV_FILTER_INT16_H__ |
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2 #define __RESAMPLER_SINC_CONV_FILTER_INT16_H__ |
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3 /* |
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4 * Copyright (c) 2010 Ixonos Plc. |
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5 * All rights reserved. |
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6 * This component and the accompanying materials are made available |
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7 * under the terms of the "Eclipse Public License v1.0" |
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8 * which accompanies this distribution, and is available |
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9 * at the URL "http://www.eclipse.org/legal/epl-v10.html". |
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10 * |
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11 * Initial Contributors: |
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12 * Nokia Corporation - Initial contribution |
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13 * |
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14 * Contributors: |
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15 * Ixonos Plc |
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16 * |
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17 * Description: |
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18 * |
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19 */ |
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20 |
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21 |
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22 #include "resampler_common_defs.h" |
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23 #include "resampler_data_types.h" |
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24 |
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25 static FORCEINLINE int32 |
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26 RESAMPLER_SincConvFilterInt16(const int16 *signalBuf, |
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27 const int16 *filterPtr1, |
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28 const int16 *filterPtr2, |
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29 int length) |
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30 { |
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31 |
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32 int32 newSample(0); |
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33 const int16 *bufferPtr1 = signalBuf; |
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34 const int16 *bufferPtr2 = signalBuf+1; |
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35 // Calculate the filter. |
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36 // Keep newSample in s1.30 format to reduce rounding errors |
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37 for (int l = length; l >0 ; l-=4) |
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38 { |
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39 newSample += (int32)(*filterPtr1++) * (*bufferPtr1--) + (int32)(*filterPtr2++) * (*bufferPtr2++); |
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40 newSample += (int32)(*filterPtr1++) * (*bufferPtr1--) + (int32)(*filterPtr2++) * (*bufferPtr2++); |
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41 newSample += (int32)(*filterPtr1++) * (*bufferPtr1--) + (int32)(*filterPtr2++) * (*bufferPtr2++); |
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42 newSample += (int32)(*filterPtr1++) * (*bufferPtr1--) + (int32)(*filterPtr2++) * (*bufferPtr2++); |
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43 } |
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44 return newSample; |
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45 } |
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46 |
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47 #endif /* __RESAMPLER_SINC_CONV_FILTER_INT16_H__ */ |
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