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1 // Copyright (c) 2002-2009 Nokia Corporation and/or its subsidiary(-ies). |
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2 // All rights reserved. |
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3 // This component and the accompanying materials are made available |
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4 // under the terms of "Eclipse Public License v1.0" |
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5 // which accompanies this distribution, and is available |
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6 // at the URL "http://www.eclipse.org/legal/epl-v10.html". |
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7 // |
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8 // Initial Contributors: |
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9 // Nokia Corporation - initial contribution. |
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10 // |
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11 // Contributors: |
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12 // |
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13 // Description: |
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14 // |
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15 |
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16 #ifndef RATECONVERTIMPL_H |
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17 #define RATECONVERTIMPL_H |
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18 |
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19 #include "mmf/utils/rateconvert.h" |
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20 |
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21 /** |
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22 Abstract class that all specific converters derive from. |
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23 */ |
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24 NONSHARABLE_CLASS( CChannelAndSampleRateConverterCommon ) : public CChannelAndSampleRateConverter |
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25 { |
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26 public: |
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27 virtual void SetRates(TInt aSrcRate,TInt aDstRate); |
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28 |
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29 // from CChannelAndSampleRateConverter |
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30 void Reset(); |
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31 TInt MaxConvertBufferSize(TInt aSrcBufferSize, TBool aRoundUpToPower); |
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32 |
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33 protected: |
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34 CChannelAndSampleRateConverterCommon(); |
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35 |
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36 static TInt NextPowerUp(TInt aValue); |
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37 inline static TInt StereoToMono(TInt aSample); |
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38 inline static TInt MonoToStereo(TInt aSample); |
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39 |
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40 inline static TInt LengthBytesTo16Bit(TInt aLength); |
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41 inline static TInt LengthBytesTo32Bit(TInt aLength); |
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42 inline static TInt Length16BitToBytes(TInt aLength); |
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43 inline static TInt Length32BitToBytes(TInt aLength); |
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44 }; |
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45 |
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46 /* functions for copying from mono to stereo and from stereo to mono */ |
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47 |
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48 inline TInt CChannelAndSampleRateConverterCommon::StereoToMono(TInt aSample) |
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49 { |
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50 TInt topChannel = aSample>>16; // will naturally keep sign |
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51 TInt bottomChannel = TInt16(aSample&0xffff); // need to sign extend |
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52 TInt monoSample = (topChannel + bottomChannel)/2; // add two channels and divide |
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53 return monoSample; |
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54 } |
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55 |
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56 inline TInt CChannelAndSampleRateConverterCommon::MonoToStereo(TInt aSample) |
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57 { |
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58 TInt32 stereoSample = (aSample<<16) | (aSample&0xffff); |
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59 #ifdef _DEBUG |
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60 TInt monoSample = StereoToMono(stereoSample); |
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61 ASSERT(monoSample==aSample); |
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62 #endif |
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63 return TInt(stereoSample); |
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64 } |
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65 |
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66 // Convert various lengths by multipling or dividing by 2 or 4 |
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67 |
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68 inline TInt CChannelAndSampleRateConverterCommon::LengthBytesTo16Bit(TInt aLength) |
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69 { |
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70 return aLength/sizeof(TInt16); |
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71 } |
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72 |
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73 inline TInt CChannelAndSampleRateConverterCommon::LengthBytesTo32Bit(TInt aLength) |
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74 { |
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75 return aLength/sizeof(TInt32); |
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76 } |
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77 |
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78 inline TInt CChannelAndSampleRateConverterCommon::Length16BitToBytes(TInt aLength) |
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79 { |
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80 return aLength*sizeof(TInt16); |
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81 } |
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82 |
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83 inline TInt CChannelAndSampleRateConverterCommon::Length32BitToBytes(TInt aLength) |
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84 { |
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85 return aLength*sizeof(TInt32); |
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86 } |
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87 |
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88 /** |
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89 Abstract class that all specific rate converters derive from - as opposed to channel converters |
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90 */ |
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91 NONSHARABLE_CLASS( CChannelAndSampleRateConvert ) : public CChannelAndSampleRateConverterCommon |
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92 { |
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93 public: |
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94 |
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95 // from CChannelAndSampleRateConverterCommon |
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96 void Reset(); |
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97 TInt MaxConvertBufferSize(TInt aSrcBufferSize, TBool aRoundUpToPower); |
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98 void SetRates(TInt aSrcRate,TInt aDstRate); |
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99 |
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100 protected: |
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101 CChannelAndSampleRateConvert(); |
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102 |
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103 TInt SizeOfUpsampleBuffer(TInt aBufferLength); |
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104 protected: |
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105 /* |
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106 The sample rate of the data in the source buffer |
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107 */ |
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108 TInt iFromRate; |
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109 /* |
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110 The sample rate of the data in the destination buffer |
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111 */ |
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112 TInt iToRate; |
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113 |
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114 TInt iFraction; |
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115 TInt iIndex; |
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116 }; |
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117 |
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118 NONSHARABLE_CLASS( CStereoToMonoRateConverter ) : public CChannelAndSampleRateConvert |
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119 { |
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120 public: |
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121 CStereoToMonoRateConverter(); |
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122 |
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123 protected: |
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124 // from CChannelAndSampleRateConvert |
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125 TInt Convert(const TDesC8& aSrcBuffer, TDes8& aDstBuffer); |
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126 TInt MaxConvertBufferSize(TInt aSrcBufferSize, TBool aRoundUpToPower); |
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127 }; |
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128 |
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129 NONSHARABLE_CLASS( CStereoToMonoConverter ) : public CChannelAndSampleRateConverterCommon |
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130 { |
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131 public: |
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132 CStereoToMonoConverter(); |
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133 |
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134 protected: |
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135 // from CChannelAndSampleRateConverterCommon |
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136 TInt Convert(const TDesC8& aSrcBuffer, TDes8& aDstBuffer); |
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137 TInt MaxConvertBufferSize(TInt aSrcBufferSize, TBool aRoundUpToPower); |
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138 }; |
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139 |
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140 NONSHARABLE_CLASS( CStereoToStereoRateConverter ) : public CChannelAndSampleRateConvert |
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141 { |
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142 public: |
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143 CStereoToStereoRateConverter(); |
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144 |
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145 protected: |
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146 // from CChannelAndSampleRateConvert |
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147 TInt Convert(const TDesC8& aSrcBuffer, TDes8& aDstBuffer); |
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148 }; |
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149 |
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150 NONSHARABLE_CLASS( CMonoToMonoRateConverter ) : public CChannelAndSampleRateConvert |
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151 { |
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152 public: |
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153 CMonoToMonoRateConverter(); |
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154 |
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155 protected: |
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156 // from CChannelAndSampleRateConvert |
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157 TInt Convert(const TDesC8& aSrcBuffer, TDes8& aDstBuffer); |
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158 }; |
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159 |
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160 NONSHARABLE_CLASS( CMonoToStereoConverter ) : public CChannelAndSampleRateConverterCommon |
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161 { |
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162 public: |
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163 CMonoToStereoConverter(); |
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164 |
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165 protected: |
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166 // from CChannelAndSampleRateConverterCommon |
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167 TInt Convert(const TDesC8& aSrcBuffer, TDes8& aDstBuffer); |
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168 TInt MaxConvertBufferSize(TInt aSrcBufferSize, TBool aRoundUpToPower); |
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169 }; |
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170 |
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171 NONSHARABLE_CLASS( CMonoToStereoRateConverter ) : public CChannelAndSampleRateConvert |
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172 { |
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173 public: |
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174 CMonoToStereoRateConverter(); |
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175 |
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176 protected: |
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177 // from CChannelAndSampleRateConvert |
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178 TInt Convert(const TDesC8& aSrcBuffer, TDes8& aDstBuffer); |
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179 TInt MaxConvertBufferSize(TInt aSrcBufferSize, TBool aRoundUpToPower); |
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180 }; |
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181 |
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182 #endif |
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183 |