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1 /* |
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2 * Copyright (c) 1997-2002 Nokia Corporation and/or its subsidiary(-ies). |
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3 * All rights reserved. |
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4 * This component and the accompanying materials are made available |
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5 * under the terms of "Eclipse Public License v1.0" |
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6 * which accompanies this distribution, and is available |
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7 * at the URL "http://www.eclipse.org/legal/epl-v10.html". |
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8 * |
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9 * Initial Contributors: |
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10 * Nokia Corporation - initial contribution. |
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11 * |
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12 * Contributors: |
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13 * |
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14 * Description: |
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15 * |
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16 */ |
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17 |
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18 |
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19 |
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20 #include "MMFPcm16ToImaAdPcmStereoCodec.h" |
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21 |
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22 // __________________________________________________________________________ |
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23 // Implementation |
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24 |
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25 CMMFCodec* CMMFPcm16ImaAdPcmStereoCodec::NewL(TAny* aInitParams) |
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26 { |
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27 CMMFPcm16ImaAdPcmStereoCodec* self=new(ELeave) CMMFPcm16ImaAdPcmStereoCodec(); |
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28 CleanupStack::PushL(self); |
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29 self->ConstructL(aInitParams); |
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30 CleanupStack::Pop(self); |
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31 return STATIC_CAST( CMMFCodec*, self ); |
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32 } |
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33 |
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34 CMMFPcm16ImaAdPcmStereoCodec::~CMMFPcm16ImaAdPcmStereoCodec() |
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35 { |
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36 } |
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37 |
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38 CMMFPcm16ImaAdPcmStereoCodec::CMMFPcm16ImaAdPcmStereoCodec() : i16PcmToImaAdpcm(2) |
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39 { |
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40 } |
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41 |
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42 void CMMFPcm16ImaAdPcmStereoCodec::ConstructL(TAny* /*aInitParams*/) |
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43 { |
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44 iTempSrcBufferPtr = iTempSrcBuffer; |
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45 iTempSrcBufferCount = 0; |
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46 } |
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47 |
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48 /************************************************************* |
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49 CMMFPcm16ImaAdPcmStereoCodec::ProcessL |
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50 |
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51 This function converts stereo PCM samples to IMA ADPCM samples |
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52 in blocks of KImaAdpcmBlockAlign (256) bytes. Any left |
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53 over bytes that do not fill a block are currently discarded. |
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54 996 source bytes are required to fill a 256 byte block. |
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55 **************************************************************/ |
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56 TCodecProcessResult CMMFPcm16ImaAdPcmStereoCodec::ProcessL(const CMMFBuffer& aSrc, CMMFBuffer& aDst) |
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57 { |
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58 TCodecProcessResult result; |
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59 result.iStatus = TCodecProcessResult::EProcessIncomplete; |
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60 |
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61 //convert from generic CMMFBuffer to CMMFDataBuffer |
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62 iSrc = STATIC_CAST(const CMMFDataBuffer*, &aSrc); |
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63 iDst = STATIC_CAST(CMMFDataBuffer*, &aDst); |
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64 |
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65 const TUint srcLen = iSrc->Data().Length(); |
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66 const TUint dstMaxLen = iDst->Data().MaxLength(); |
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67 const TUint sourceRemain = srcLen - iSrc->Position(); |
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68 |
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69 if (dstMaxLen < KImaAdpcmBlockAlign) |
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70 User::Leave(KErrArgument); |
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71 |
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72 //reset data if not a consecutive frame number |
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73 if ((iSrc->FrameNumber() != iLastFrameNumber) && (iSrc->FrameNumber() != (iLastFrameNumber+1))) |
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74 { |
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75 iTempSrcBufferPtr = iTempSrcBuffer; |
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76 iTempSrcBufferCount = 0; |
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77 } |
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78 iLastFrameNumber = iSrc->FrameNumber(); |
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79 |
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80 TUint dstRemain = (dstMaxLen - iDst->Position()); |
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81 TUint srcToFillTempBuffer = 0; |
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82 |
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83 //take account of src to be added to temporary buffer |
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84 if (iTempSrcBufferCount > 0) |
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85 { |
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86 srcToFillTempBuffer = KImaAdpcmStereoTempBufferSize - iTempSrcBufferCount; |
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87 |
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88 if (srcToFillTempBuffer<sourceRemain) //enough source to fill temporary buffer |
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89 dstRemain -= KImaAdpcmBlockAlign; |
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90 else //not enough source to fill the temporary buffer |
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91 srcToFillTempBuffer = sourceRemain; |
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92 } |
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93 |
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94 //calculate how much source is required to fill the destination buffer |
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95 TUint blocksRemaining = dstRemain/KImaAdpcmBlockAlign; |
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96 TUint maxUsableDst = blocksRemaining * KImaAdpcmBlockAlign; |
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97 TUint srcToUse = blocksRemaining * KImaAdpcmStereoSamplesPerBlock * 4; |
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98 |
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99 srcToUse += srcToFillTempBuffer; |
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100 srcToUse = (srcToUse<sourceRemain ? srcToUse : sourceRemain); |
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101 |
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102 //we need to cast away CONST even on the source, as the TClass needs a TUint8* |
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103 TUint8* pSrc = CONST_CAST(TUint8*,iSrc->Data().Ptr()); |
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104 pSrc += iSrc->Position(); |
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105 TUint8* pDst = CONST_CAST(TUint8*,iDst->Data().Ptr()); |
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106 pDst += iDst->Position(); |
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107 |
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108 TUint dstBytesAdded = 0; |
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109 TUint srcLeft = srcToUse; |
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110 |
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111 //convert remaining source from previous call to ProcessL |
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112 if (iTempSrcBufferCount > 0) |
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113 { |
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114 //Fill temp buffer from source buffer |
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115 while((iTempSrcBufferCount < KImaAdpcmStereoTempBufferSize) && (srcLeft)) |
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116 { |
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117 *iTempSrcBufferPtr++ = *pSrc++; |
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118 iTempSrcBufferCount++; |
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119 srcLeft--; |
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120 } |
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121 |
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122 if (iTempSrcBufferCount == KImaAdpcmStereoTempBufferSize) |
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123 { |
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124 //reset |
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125 iTempSrcBufferCount = 0; |
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126 iTempSrcBufferPtr = iTempSrcBuffer; |
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127 |
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128 i16PcmToImaAdpcm.Convert(iTempSrcBufferPtr, pDst, KImaAdpcmStereoSamplesPerBlock); |
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129 |
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130 pDst += KImaAdpcmBlockAlign; |
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131 dstBytesAdded += KImaAdpcmBlockAlign; |
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132 } |
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133 } |
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134 |
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135 //convert full blocks |
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136 while (srcLeft >= (KImaAdpcmStereoSamplesPerBlock*4)) |
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137 { |
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138 i16PcmToImaAdpcm.Convert(pSrc, pDst, KImaAdpcmStereoSamplesPerBlock); |
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139 |
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140 pSrc += KImaAdpcmStereoSamplesPerBlock*4; |
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141 pDst += KImaAdpcmBlockAlign; |
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142 |
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143 dstBytesAdded += KImaAdpcmBlockAlign; |
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144 srcLeft -= KImaAdpcmStereoSamplesPerBlock*4; |
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145 } |
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146 |
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147 //save remaining source in iTempSrcBuffer |
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148 while (srcLeft) |
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149 { |
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150 *iTempSrcBufferPtr++ = *pSrc++; |
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151 iTempSrcBufferCount++; |
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152 srcLeft--; |
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153 } |
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154 |
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155 //if the source buffer is consumed |
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156 if ((srcLen == srcToUse + iSrc->Position())) |
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157 { |
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158 if (dstBytesAdded < maxUsableDst) |
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159 result.iStatus = TCodecProcessResult::EDstNotFilled; |
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160 else |
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161 result.iStatus = TCodecProcessResult::EProcessComplete; |
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162 } |
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163 |
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164 result.iSrcBytesProcessed = srcToUse; |
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165 result.iDstBytesAdded = dstBytesAdded; |
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166 |
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167 iDst->Data().SetLength(iDst->Position() + result.iDstBytesAdded); |
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168 |
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169 return result; |
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170 } |