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1 // Copyright (c) 2005-2009 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 #include "MmfBtAudioCodec.h" |
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17 #include <mmfpaniccodes.h> |
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18 #include "MmfBtImaAdpcmToPcm16HwDevice.h" |
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19 #include "../../MmfBtFileDependencyUtil.h" |
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20 |
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21 /** |
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22 * |
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23 * NewL |
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24 * |
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25 */ |
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26 CMMFImaAdpcmToPcm16CodecHwDevice* CMMFImaAdpcmToPcm16CodecHwDevice::NewL() |
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27 { |
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28 CMMFImaAdpcmToPcm16CodecHwDevice* self=new(ELeave)CMMFImaAdpcmToPcm16CodecHwDevice(); |
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29 CleanupStack::PushL(self); |
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30 self->ConstructL(); |
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31 CleanupStack::Pop(self); |
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32 return self; |
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33 } |
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34 |
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35 /** |
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36 * |
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37 * ConstructL |
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38 * |
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39 */ |
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40 void CMMFImaAdpcmToPcm16CodecHwDevice::ConstructL() |
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41 { |
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42 iCodec = new (ELeave) CMMFImaAdpcmToPcm16Codec(); |
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43 } |
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44 |
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45 /** |
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46 * |
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47 * ~CMMFMulawPcm16HwDevice |
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48 * |
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49 */ |
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50 CMMFImaAdpcmToPcm16CodecHwDevice::~CMMFImaAdpcmToPcm16CodecHwDevice() |
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51 { |
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52 } |
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53 |
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54 /** |
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55 * |
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56 * Codec |
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57 * |
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58 */ |
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59 CMMFSwCodec &CMMFImaAdpcmToPcm16CodecHwDevice::Codec() |
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60 { |
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61 return *iCodec; |
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62 } |
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63 |
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64 /** |
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65 @see CMMFSwCodecWrapper::Start |
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66 |
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67 this function sets SampleRate and Channels for CMMFImaAdpcmToPcm16Codec |
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68 */ |
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69 TInt CMMFImaAdpcmToPcm16CodecHwDevice::Start(TDeviceFunc aFuncCmd, TDeviceFlow aFlowCmd) |
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70 { |
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71 TInt err = CMMFSwCodecWrapper::Start(aFuncCmd, aFlowCmd); |
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72 if (err != 0) |
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73 return err; |
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74 return ((CMMFImaAdpcmToPcm16Codec*)iCodec)->Configure(iChannels, iSampleRate); |
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75 } |
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76 |
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77 CMMFImaAdpcmToPcm16Codec::CMMFImaAdpcmToPcm16Codec() |
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78 { |
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79 iChannels = 1; |
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80 iSampleRate = 0; |
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81 iBlockAlign = KImaAdpcmBlockAlign; |
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82 iSamplesPerBlock = KImaAdpcmSamplesPerBlock; |
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83 } |
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84 /** |
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85 * |
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86 * ProcessL |
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87 * @param aSrc |
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88 * @param aDst |
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89 * @pre position of buffer aSrc is 0 |
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90 * @pre position of buffer aDst is 0 |
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91 * @pre sufficient bytes in output to consume input |
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92 * @return TCodecProcessResult |
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93 * This function converts IMA ADPCM samples to PCM samples. |
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94 * |
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95 */ |
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96 CMMFSwCodec::TCodecProcessResult CMMFImaAdpcmToPcm16Codec::ProcessL(const CMMFBuffer& aSrc, CMMFBuffer& aDst) |
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97 { |
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98 CMMFSwCodec::TCodecProcessResult result; |
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99 result.iCodecProcessStatus = result.iCodecProcessStatus = TCodecProcessResult::EProcessComplete; |
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100 |
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101 //convert from generic CMMFBuffer to CMMFDataBuffer |
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102 const CMMFDataBuffer* src = STATIC_CAST(const CMMFDataBuffer*, &aSrc); |
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103 CMMFDataBuffer* dst = STATIC_CAST(CMMFDataBuffer*, &aDst); |
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104 |
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105 if( !CheckPreconditions( src, dst ) ) |
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106 { |
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107 //[ precondition(s) violation ] |
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108 User::Leave(KErrArgument); |
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109 } |
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110 |
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111 //calculate how much source is required to fill the destination buffer |
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112 TUint blocksRemaining = src->Data().Length() / iBlockAlign; |
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113 |
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114 //we need to cast away CONST even on the source, as the TClass needs a TUint8* |
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115 TUint8* pSrc = CONST_CAST(TUint8*,src->Data().Ptr()); |
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116 TUint8* pDst = CONST_CAST(TUint8*,dst->Data().Ptr()); |
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117 |
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118 //[ [process full blocks ] |
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119 TUint dstBytesAdded = 0; |
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120 for( TUint count = 0; count < blocksRemaining; count++ ) |
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121 { |
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122 iImaAdpcmTo16Pcm.Convert(pSrc, pDst, iSamplesPerBlock); |
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123 pSrc += iBlockAlign; |
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124 pDst += (iSamplesPerBlock * sizeof(TInt16)); |
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125 dstBytesAdded += (iSamplesPerBlock * sizeof(TInt16)); |
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126 } |
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127 |
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128 result.iCodecProcessStatus = TCodecProcessResult::EProcessComplete; |
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129 result.iSrcBytesProcessed = blocksRemaining * iBlockAlign; |
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130 result.iDstBytesAdded = dstBytesAdded; |
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131 dst->Data().SetLength(result.iDstBytesAdded); |
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132 |
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133 //[ check post conditions |
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134 __ASSERT_DEBUG( (src->Position() == 0), TMmfAudioCodecPanicsNameSpace::Panic( TMmfAudioCodecPanicsNameSpace::EPostConditionViolation )); |
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135 __ASSERT_DEBUG( (dst->Position() == 0), TMmfAudioCodecPanicsNameSpace::Panic( TMmfAudioCodecPanicsNameSpace::EPostConditionViolation )); |
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136 TInt r1 = src->Data().Length(); |
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137 r1 /= iBlockAlign; |
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138 TInt r2 = dst->Data().Length(); |
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139 r2 /=(iSamplesPerBlock * sizeof(TInt16)); |
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140 __ASSERT_DEBUG( r1== r2, TMmfAudioCodecPanicsNameSpace::Panic(TMmfAudioCodecPanicsNameSpace::EPostConditionViolation )); |
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141 __ASSERT_DEBUG( dst->Data().Length() % 2 == 0, TMmfAudioCodecPanicsNameSpace::Panic( TMmfAudioCodecPanicsNameSpace::EPostConditionViolation )); // pcm output |
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142 |
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143 return result; |
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144 } |
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145 |
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146 /** |
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147 * |
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148 * Preconditions |
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149 * This methos tests the preconditions of the ProcessL method |
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150 * @return TBool ETrue for sucess and EFalse for failure of the preconditions |
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151 * |
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152 **/ |
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153 TBool CMMFImaAdpcmToPcm16Codec::CheckPreconditions( const CMMFDataBuffer* aSrcBuffer, CMMFDataBuffer* aDestBuffer ) |
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154 { |
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155 TBool result = EFalse; |
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156 |
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157 if(! aSrcBuffer ) |
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158 { |
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159 return result; |
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160 } |
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161 |
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162 if( ! aDestBuffer ) |
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163 { |
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164 return result; |
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165 } |
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166 |
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167 // Check position of src and dest are 0 |
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168 if( aSrcBuffer->Position() ) |
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169 { |
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170 return result; |
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171 } |
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172 |
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173 // Check position of src and dest are 0 |
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174 if( aDestBuffer->Position() ) |
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175 { |
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176 return result; |
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177 } |
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178 |
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179 // check there are sufficient bytes in the output to consume the input |
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180 const TUint KTempBufferSize = iSamplesPerBlock * 2; |
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181 TInt numInputSubFrames = aSrcBuffer->Data().Length() / iBlockAlign; |
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182 TInt numOutputSubFrames = aDestBuffer->Data().MaxLength() / KTempBufferSize; |
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183 |
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184 //[ we need modulo 1010 bytes on all src frames that are not the last |
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185 // frame |
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186 // For the last frame we will code only whole frames and effectively |
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187 // drop any remaining samples] |
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188 TBool validInputDataLength = (aSrcBuffer->Data().Length() % iBlockAlign == 0) ; |
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189 |
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190 if( (numInputSubFrames > numOutputSubFrames) || // sufficient space in the output for the input |
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191 (aSrcBuffer->Position() > 0 ) || // position must be zero since we can eat all the data |
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192 (aDestBuffer->Position() > 0 ) || |
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193 (!validInputDataLength)) //position must be zero |
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194 { |
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195 return result; |
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196 } |
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197 |
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198 result = ETrue; // preconditions have been satisfied |
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199 |
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200 return result; |
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201 } |
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202 |
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203 TInt CMMFImaAdpcmToPcm16Codec::Configure(TUint aChannels, TUint aSampleRate) |
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204 { |
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205 iChannels = aChannels; |
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206 iSampleRate = aSampleRate; |
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207 |
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208 switch (iSampleRate * iChannels) |
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209 { |
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210 case 8000: // fall through, same as 11025 |
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211 case 11025: |
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212 case 16000: |
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213 iBlockAlign = 256; |
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214 break; |
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215 case 22050: |
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216 iBlockAlign = 512; |
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217 break; |
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218 |
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219 case 44100: |
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220 iBlockAlign = 1024; |
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221 break; |
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222 |
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223 case 88200: |
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224 iBlockAlign = 2048; |
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225 break; |
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226 |
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227 default: |
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228 return KErrArgument; |
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229 } |
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230 |
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231 const TUint KImaAdpcmBitsPerSample = 4; |
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232 // SamplesPerBlock = [(BlockAlign - 4 * Channels) * 8] / (BitsPerSample * Channels) + 1 |
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233 iSamplesPerBlock = (iBlockAlign - 4 * iChannels) * 8 / (KImaAdpcmBitsPerSample * iChannels) + 1; |
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234 |
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235 return KErrNone; |
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236 } |
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237 |
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238 |
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239 |