videoeditorengine/audioeditorengine/resampler/inc/resampler_sinc_conv_filter_two_to_one_int16.h
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1 #ifndef __RESAMPLER_SINC_CONV_FILTER_TWO_TO_ONE_INT16_H__ |
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2 #define __RESAMPLER_SINC_CONV_FILTER_TWO_TO_ONE_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_SincConvFilterTwoToOneInt16(const int16 *signalBuf, |
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27 const int16 *filterPtr, |
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28 int length) |
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29 { |
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30 int32 newSample((int32)signalBuf[0] << 14); |
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31 |
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32 const int16 *bufferPtr1 = signalBuf - 1; |
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33 const int16 *bufferPtr2 = signalBuf + 1; |
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34 for (int l = length; l >0 ; l--) |
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35 { |
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36 // Calculate the filter. |
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37 // Keep newSample in s1.30 format to reduce rounding errors |
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38 newSample += (int32)(*filterPtr) * (*bufferPtr1) + (int32)(*filterPtr) * (*bufferPtr2); |
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39 filterPtr++; |
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40 bufferPtr1 -= 2; |
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41 bufferPtr2 += 2; |
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42 } |
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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 |
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48 #endif /* __RESAMPLER_SINC_CONV_FILTER_TWO_TO_ONE_INT16_H__ */ |