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1 // Copyright (c) 2003-2009 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 "mmfwavformat.h" |
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17 |
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18 #include "WavDecodeUtility.h" |
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19 |
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20 |
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21 CWavDecodeUtility::CWavDecodeUtility() |
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22 { |
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23 } |
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24 |
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25 void CWavDecodeUtility::ConstructL(TDesC8& aBuffer) |
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26 { |
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27 iBuffer = &aBuffer; |
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28 FindRiffChunksL(); |
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29 ProcessFormatHeaderL(); |
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30 } |
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31 |
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32 CWavDecodeUtility* CWavDecodeUtility::NewL(TDesC8& aBuffer) |
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33 { |
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34 CWavDecodeUtility* self = new (ELeave) CWavDecodeUtility(); |
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35 CleanupStack::PushL(self); |
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36 self->ConstructL(aBuffer); |
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37 CleanupStack::Pop(); |
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38 return self; |
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39 } |
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40 |
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41 |
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42 CWavDecodeUtility::~CWavDecodeUtility() |
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43 { |
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44 } |
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45 |
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46 TUint16 CWavDecodeUtility::Read16(const TUint8* aPtr) |
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47 |
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48 { |
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49 TUint16 ret = *(REINTERPRET_CAST(const TUint16*, aPtr)); |
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50 return ret; |
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51 } |
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52 |
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53 TUint32 CWavDecodeUtility::Read32(const TUint8* aPtr) |
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54 { |
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55 TUint32 x = *aPtr++; |
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56 x |= *aPtr++ << 8; |
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57 x |= *aPtr++ << 16; |
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58 x |= *aPtr++ << 24; |
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59 return x; |
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60 } |
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61 void CWavDecodeUtility::AssignChunkTo(TMdaRiffChunk* aAssignedChunk) |
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62 { |
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63 Mem::Copy(REINTERPRET_CAST(TUint8*, aAssignedChunk), REINTERPRET_CAST(TUint8*, &iCurrent),sizeof(TMdaRiffChunk)); |
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64 aAssignedChunk->iFound=ETrue; |
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65 } |
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66 |
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67 void CWavDecodeUtility::ReadChunk(TMdaRiffChunk* aChunk) |
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68 { |
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69 Mem::FillZ(REINTERPRET_CAST(TUint8*, aChunk),sizeof(TMdaRiffChunk)); // Zero data |
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70 aChunk->iPosition=iPos + KRiffChunkHeaderLength; |
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71 aChunk->iName = Read32(iStartPtr + iPos - iLastReadPosition); |
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72 aChunk->iLength = Read32(iStartPtr + iPos - iLastReadPosition + KRiffChunkDataLength); |
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73 } |
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74 void CWavDecodeUtility::FindRiffChunksL() |
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75 { |
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76 if (!iFoundChunks) |
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77 { |
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78 iFoundChunks=ETrue; |
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79 // iStartPtr=iBuffer->Data().Ptr(); |
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80 iStartPtr=iBuffer->Ptr(); |
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81 iPos=0; |
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82 iLastReadPosition=0;//Set by CBase, but what the heck |
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83 iDone=EFalse; |
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84 } |
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85 else |
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86 {//We've done another read. If there's < chunk in the buffer then something's wrong |
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87 if (iBuffer->Length() < STATIC_CAST(TInt, KRiffChunkHeaderLength)) |
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88 { |
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89 if ((iFormatChunk.iFound) && (iDataChunk.iFound)) |
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90 { |
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91 iDone = ETrue; //it should be ok to exit loop |
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92 return; |
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93 } |
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94 else |
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95 { |
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96 User::Leave(KErrCorrupt); |
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97 } |
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98 } |
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99 } |
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100 |
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101 while (!iDone) |
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102 { |
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103 TInt advance=0; |
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104 |
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105 ReadChunk(&iCurrent); |
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106 |
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107 if (iCurrent.iName == KRiffChunkNameRiff)//we need to look INSIDE the RIFF chunk |
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108 { |
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109 if(iBuffer->Length() < STATIC_CAST(TInt, KRiffContainerChunkHeaderLength)) |
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110 User::Leave(KErrCorrupt); |
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111 iRiffChunkLength=iCurrent.iLength + KRiffChunkHeaderLength; |
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112 advance=KRiffContainerChunkHeaderLength; |
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113 } |
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114 else |
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115 { |
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116 advance=iCurrent.iLength + KRiffChunkHeaderLength; //... and skip all others |
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117 } |
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118 |
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119 if (iCurrent.iName == KRiffChunkNameFmt_) |
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120 AssignChunkTo(&iFormatChunk); |
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121 |
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122 else if (iCurrent.iName == KRiffChunkNameFact) |
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123 AssignChunkTo(&iFactChunk); |
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124 |
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125 else if (iCurrent.iName == KRiffChunkNameData) |
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126 AssignChunkTo(&iDataChunk); |
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127 |
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128 if (iDataChunk.iFound && iFormatChunk.iFound && iFactChunk.iFound) |
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129 { |
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130 iDone=ETrue; |
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131 } |
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132 else |
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133 {//still have chunks to look for |
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134 iPos+=advance; |
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135 if (iPos & 1) |
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136 iPos++; |
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137 |
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138 if ((TUint)iPos>=(TUint)iRiffChunkLength) |
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139 { |
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140 iDone=ETrue;//end of file |
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141 iClipLength = iRiffChunkLength; |
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142 } |
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143 else |
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144 {//make sure we have at least a chunk's worth left in the buffer |
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145 if ((TUint)(iPos-iLastReadPosition) > |
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146 (TUint)(iBuffer->Length() -KRiffChunkHeaderLength)) |
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147 { |
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148 iLastReadPosition=iPos; |
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149 //DoReadL(iLastReadPosition); |
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150 return; |
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151 } |
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152 } |
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153 } |
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154 } |
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155 |
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156 iClipLength = iRiffChunkLength; |
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157 if (iClipLength == 0) User::Leave(KErrNotFound); |
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158 else if (!(iDataChunk.iFound && iFormatChunk.iFound)) |
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159 User::Leave(KErrCorrupt); |
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160 |
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161 } |
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162 |
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163 void CWavDecodeUtility::ProcessFormatHeaderL() |
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164 { |
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165 TMdaRiffChunk* chunk = &iFormatChunk; |
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166 |
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167 if (!chunk) |
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168 User::Leave(KErrCorrupt); |
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169 |
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170 iLastReadPosition = chunk->iPosition; // Should be beginning of fmt block |
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171 //DoReadL(iLastReadPosition); |
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172 |
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173 // Set the real format |
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174 const TUint8* rawform = iBuffer->Ptr() + iLastReadPosition; //skip _fmt & length |
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175 iCodecId = Read16(rawform); rawform+=2; |
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176 iChannels = Read16(rawform); rawform+=2; |
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177 if ((iChannels != 1)&&(iChannels != 2)) //only 1 or 2 channels allowed |
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178 User::Leave(KErrCorrupt); |
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179 |
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180 iSampleRate = Read32(rawform); rawform+=4; // Skip bytes per second estimate |
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181 if (!iSampleRate) User::Leave(KErrCorrupt); |
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182 |
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183 iAverageBytesPerSecond = Read32(rawform); rawform+=4; |
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184 iBlockAlign = Read16(rawform); rawform+=2; |
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185 |
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186 iBitsPerSample = Read16(rawform); |
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187 rawform+=2; |
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188 |
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189 switch (iCodecId) |
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190 { |
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191 case KMMFWavFormatTypePcm: |
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192 { |
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193 } |
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194 break; |
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195 case KMMFWavFormatTypeImaAdpcm: |
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196 { |
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197 } |
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198 break; |
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199 case KMMFWavFormatTypeAlaw: |
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200 { |
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201 } |
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202 break; |
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203 case KMMFWavFormatTypeMulaw: |
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204 { |
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205 } |
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206 break; |
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207 case KMMFWavFormatTypeGSM610: |
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208 { |
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209 } |
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210 break; |
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211 default: |
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212 User::Leave(KErrNotSupported); |
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213 } |
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214 |
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215 if (iCodecId == KMMFWavFormatTypeImaAdpcm) |
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216 { |
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217 TUint16 extraData = Read16(rawform); |
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218 if (extraData == 2) |
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219 { |
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220 rawform+=2; |
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221 iSamplesPerBlock = Read16(rawform); |
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222 rawform+=2; |
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223 } |
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224 } |
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225 |
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226 // Is there a fact chunk? |
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227 if (iFactChunk.iFound) |
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228 iHasFactChunk = ETrue; |
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229 |
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230 // Find the data block |
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231 chunk=&iDataChunk; |
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232 iStartPosition = chunk->iPosition; |
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233 iDataLength = chunk->iLength; |
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234 } |