1 /* |
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2 * Copyright (c) 2010 Ixonos Plc. |
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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 the "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 * Ixonos Plc |
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14 * |
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15 * Description: |
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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 /*-- Project Headers. --*/ |
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21 #include "AudPanic.h" |
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22 #include "ProcTools.h" |
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23 #include "ProcMP3InFileHandler.h" |
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24 #include "mpheader.h" |
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25 #include "audconstants.h" |
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26 |
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27 |
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28 #include "ProcMP3FrameHandler.h" |
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29 |
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30 // Debug print macro |
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31 #if defined _DEBUG |
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32 #include <e32svr.h> |
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33 #define PRINT(x) RDebug::Print x; |
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34 #else |
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35 #define PRINT(x) |
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36 #endif |
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37 |
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38 /* |
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39 Purpose: Minimum buffer size for determining the payload size |
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40 of a free format mp3 bitstream. |
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41 Explanation: - */ |
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42 #define MIN_MP3_FREE_FORMAT_BUF_SIZE (42) |
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43 |
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44 /* |
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45 Purpose: Buffer size for searching the start of a mp3 frame. |
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46 Explanation: - */ |
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47 const int16 Kmp3BufSize = 8; |
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48 |
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49 /* |
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50 Purpose: Buffer size for determining an avarage frame size of a mp3 stream. |
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51 Explanation: - */ |
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52 const int16 Kmp3BitrateRegions = 4; |
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53 |
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54 /* |
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55 Purpose: # of frames processed from each region. |
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56 Explanation: This is used when the avarage frame size is determined. */ |
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57 const int16 Kmp3BitrateNumFrames = 125; |
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58 |
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59 /* |
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60 Purpose: Buffer size for determining if a clip is valid mp3 |
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61 Explanation: - */ |
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62 const TUint Kmp3TempBufferSize = 4096; |
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63 |
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64 // ID3v2 header's tag offset |
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65 const TUint KSizeOfTagOffset = 6; |
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66 |
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67 // The size of MP3 header, header must include bits for determining frame length |
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68 const TInt KRawMp3FrameHeaderSize = 5; |
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69 |
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70 // Bit rates in bits/sec supported by MPEG2, MPEG1 and MPEG2.5 respectively |
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71 const TInt16 cBitRateTable[3][16] = |
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72 { |
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73 {-1,8,16,24,32,40,48,56,64,80,96,112,128,144,160,0}, |
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74 {-1,32,40,48,56,64,80,96,112,128,160,192,224,256,320,0}, |
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75 {-1,8,16,24,32,40,48,56,64,80,96,112,128,144,160,0}, |
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76 }; |
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77 |
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78 // Sampling frequencies supported by MPEG2, MPEG1 and MPEG2.5 respectively |
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79 const TUint16 cSamplingFrequencyTable[3][4] = |
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80 { |
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81 {22050,24000,16000,0}, |
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82 {44100,48000,32000,0}, |
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83 {11025,12000,8000,0}, |
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84 }; |
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85 |
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86 const TInt KRawMp3MaxFrameSize = 1441; // 320kbit/s @ 32kHz = int((144*320000/32000)+1) |
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87 |
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88 CProcMP3InFileHandler* CProcMP3InFileHandler::NewL(const TDesC& aFileName, RFile* aFileHandle, CAudClip* aClip, |
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89 TInt aReadBufferSize, TInt aTargetSampleRate, TChannelMode aChannelMode) |
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90 { |
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91 CProcMP3InFileHandler* self = NewLC(aFileName, aFileHandle, aClip, aReadBufferSize, |
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92 aTargetSampleRate, aChannelMode); |
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93 CleanupStack::Pop(self); |
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94 |
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95 return self; |
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96 } |
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97 |
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98 CProcMP3InFileHandler* |
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99 CProcMP3InFileHandler::NewLC(const TDesC& aFileName, RFile* aFileHandle, CAudClip* aClip, |
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100 TInt aReadBufferSize, TInt aTargetSampleRate, TChannelMode aChannelMode) |
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101 { |
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102 CProcMP3InFileHandler* self = new (ELeave) CProcMP3InFileHandler(); |
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103 CleanupStack::PushL(self); |
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104 self->ConstructL(aFileName, aFileHandle, aClip, aReadBufferSize, |
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105 aTargetSampleRate, aChannelMode); |
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106 |
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107 return self; |
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108 } |
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109 |
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110 CProcMP3InFileHandler::CProcMP3InFileHandler() : CProcInFileHandler(), mp3FileFormat(0), |
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111 isValidMP3(0), mp3HeaderBytes(0), |
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112 mp3Log(0), isFreeFormatMP3(0), isVbrMP3(0) |
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113 { |
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114 } |
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115 |
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116 |
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117 |
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118 |
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119 TBool CProcMP3InFileHandler::GetEncAudioFrameL(HBufC8*& aFrame, TInt& aSize, TInt32& aTime) |
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120 { |
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121 TBool rValue = EFalse; |
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122 |
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123 if(!iFileOpen) |
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124 { |
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125 TAudPanic::Panic(TAudPanic::EInternal); |
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126 } |
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127 |
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128 aSize = 0; |
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129 aTime = 0; |
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130 aFrame = NULL; |
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131 |
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132 if(isValidMP3) |
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133 { |
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134 TMpFrameState frState; |
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135 int16 frameFound; |
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136 TInt bufSize; |
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137 TPtr8 mp3DataBuf(mp3HeaderBytes, Kmp3BufSize); |
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138 |
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139 /*-- Search start of next frame. --*/ |
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140 |
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141 bufSize = BufferedFileRead((TDes8&) mp3DataBuf); |
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142 if(bufSize < Kmp3BufSize) |
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143 ZERO_MEMORY(mp3HeaderBytes + bufSize, Kmp3BufSize - bufSize); |
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144 frameFound = GetMP3Frame(mp3HeaderBytes, Kmp3BufSize, &frState, 0); |
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145 |
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146 /*-- Frame found. --*/ |
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147 if(frameFound == 0) |
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148 { |
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149 TInt fLen; |
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150 |
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151 fLen = frState.frameBytes + frState.headerBytes; |
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152 fLen -= Kmp3BufSize - (frState.readBytes - frState.headerBytes); |
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153 if(fLen > 0) |
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154 { |
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155 TInt offset; |
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156 uint8 *audFrameOffsetPtr; |
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157 HBufC8 *audioFrame = HBufC8::NewL(frState.frameBytes + frState.headerBytes); |
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158 |
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159 offset = frState.readBytes - frState.headerBytes; |
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160 mp3DataBuf.Set(mp3HeaderBytes + offset, Kmp3BufSize - offset, Kmp3BufSize - offset); |
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161 |
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162 audioFrame->Des().Copy(((const TDesC8 &) mp3DataBuf)); |
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163 |
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164 audFrameOffsetPtr = (uint8 *) audioFrame->Des().Ptr(); |
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165 |
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166 TPtr8 audTmpPtr(audFrameOffsetPtr + Kmp3BufSize - offset, fLen, fLen); |
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167 |
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168 bufSize = BufferedFileRead(audTmpPtr, fLen); |
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169 |
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170 fLen = frState.frameBytes + frState.headerBytes; |
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171 audioFrame->Des().SetLength(fLen); |
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172 |
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173 aFrame = audioFrame; |
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174 aSize = fLen; |
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175 aTime = iMp3Edit->GetFrameTime(mp3FileFormat); |
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176 iCurrentTimeMilliseconds += aTime; |
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177 |
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178 TRAPD(err, ManipulateGainL(aFrame)); |
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179 |
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180 if (err != KErrNone) |
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181 { |
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182 // something went wrong with the gain manipulation |
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183 // continue by returning the original frame |
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184 } |
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185 |
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186 |
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187 rValue = ETrue; |
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188 } |
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189 } |
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190 } |
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191 |
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192 |
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193 |
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194 |
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195 return (rValue); |
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196 } |
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197 |
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198 |
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199 |
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200 CProcMP3InFileHandler::~CProcMP3InFileHandler() |
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201 { |
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202 // if(iFileOpen) |
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203 CloseFile(); |
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204 |
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205 if (iMp3Edit != 0) |
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206 { |
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207 delete iMp3Edit; |
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208 iMp3Edit = 0; |
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209 } |
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210 |
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211 if (iFileName != 0) |
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212 { |
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213 delete iFileName; |
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214 iFileName = 0; |
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215 } |
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216 |
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217 if (iReadBuffer != 0) |
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218 { |
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219 delete iReadBuffer; |
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220 iReadBuffer = 0; |
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221 } |
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222 |
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223 if (mp3FileFormat != 0) |
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224 { |
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225 delete mp3FileFormat; |
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226 mp3FileFormat = 0; |
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227 } |
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228 |
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229 if (mp3HeaderBytes != 0) |
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230 { |
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231 delete mp3HeaderBytes; |
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232 mp3HeaderBytes = 0; |
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233 } |
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234 |
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235 if (iDecoder != 0) |
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236 { |
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237 delete iDecoder; |
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238 iDecoder = 0; |
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239 } |
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240 |
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241 if (iFrameHandler != 0) |
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242 { |
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243 delete iFrameHandler; |
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244 iFrameHandler = 0; |
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245 } |
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246 |
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247 if (iSilentFrame != 0) |
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248 { |
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249 delete iSilentFrame; |
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250 iSilentFrame = 0; |
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251 } |
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252 } |
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253 |
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254 int16 CProcMP3InFileHandler:: |
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255 GetMP3Frame(uint8 *dataBytes, int16 bufSize, TMpFrameState *frState, uint8 syncStatus) |
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256 { |
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257 |
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258 |
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259 int16 locateFrame; |
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260 int16 seekSyncStatus = 0; |
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261 TPtr8 mp3DataBuf(dataBytes, bufSize); |
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262 |
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263 /*-- Search start of 1st frame. --*/ |
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264 locateFrame = 0; |
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265 frState->totalReadBytes = 0; |
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266 |
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267 while(locateFrame == 0) |
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268 { |
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269 if(syncStatus == 3) |
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270 seekSyncStatus = iMp3Edit->FreeMode(mp3FileFormat, dataBytes, bufSize, |
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271 &frState->readBytes, &frState->frameBytes, |
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272 &frState->headerBytes); |
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273 else |
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274 seekSyncStatus = iMp3Edit->SeekSync(mp3FileFormat, dataBytes, bufSize, |
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275 &frState->readBytes, &frState->frameBytes, |
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276 &frState->headerBytes, (uint8) syncStatus); |
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277 |
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278 /*-- Start of 1st frame found. --*/ |
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279 if(seekSyncStatus == 0 || seekSyncStatus == 3) |
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280 locateFrame = 1; |
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281 |
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282 /*-- Update data buffer, start of 1st frame not found yet. --*/ |
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283 else if(seekSyncStatus == 2) |
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284 { |
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285 if(frState->readBytes) |
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286 { |
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287 TInt tmpBufLen, tmp2; |
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288 |
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289 /*-- New data bytes to be read into buffer. --*/ |
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290 tmpBufLen = (int16) (bufSize - frState->readBytes); |
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291 |
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292 /*-- Move data that is possibly left in the buffer. --*/ |
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293 if(tmpBufLen) COPY_MEMORY(dataBytes, dataBytes + frState->readBytes, tmpBufLen); |
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294 |
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295 /*-- Prepare to read. --*/ |
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296 mp3DataBuf.Set(dataBytes + tmpBufLen, frState->readBytes, frState->readBytes); |
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297 |
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298 /*-- Update buffer. --*/ |
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299 tmp2 = BufferedFileRead((TDes8&) mp3DataBuf); |
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300 if(tmp2 < frState->readBytes) |
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301 ZERO_MEMORY(dataBytes + tmpBufLen + tmp2, frState->readBytes - tmp2); |
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302 |
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303 frState->totalReadBytes += frState->readBytes; |
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304 } |
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305 } |
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306 |
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307 /*-- Abort, start of 1st frame cannot be located. --*/ |
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308 else locateFrame = 1; |
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309 } |
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310 |
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311 return (seekSyncStatus); |
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312 |
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313 |
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314 } |
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315 |
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316 void CProcMP3InFileHandler:: |
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317 ConstructL(const TDesC& aFileName, RFile* aFileHandle, CAudClip* aClip, TInt aReadBufferSize, |
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318 TInt aTargetSampleRate, TChannelMode aChannelMode) |
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319 { |
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320 |
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321 |
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322 iTargetSampleRate = aTargetSampleRate; |
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323 iChannelMode = aChannelMode; |
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324 |
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325 |
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326 int16 locate1stFrame; |
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327 TMpFrameState frState; |
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328 |
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329 isVbrMP3 = 0; |
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330 isValidMP3 = 0; |
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331 isFreeFormatMP3 = 0; |
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332 |
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333 //-- Initialize file format handle. -- |
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334 mp3FileFormat = (TMpTransportHandle *) new (ELeave) TMpTransportHandle[1]; |
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335 ZERO_MEMORY(mp3FileFormat, sizeof(TMpTransportHandle)); |
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336 |
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337 //-- Buffer for header search. -- |
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338 mp3HeaderBytes = new (ELeave) uint8[Kmp3BufSize]; |
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339 ZERO_MEMORY(mp3HeaderBytes, Kmp3BufSize); |
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340 |
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341 // -- Buffer for validity check -- |
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342 HBufC8* vldBuffer = (HBufC8*) HBufC8::NewLC(Kmp3TempBufferSize); |
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343 |
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344 iMp3Edit = CMp3Edit::NewL(); |
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345 |
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346 // Set the file format parameters to default values. Note that this function |
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347 // should be called only once; when searching the start of 1st frame. |
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348 // |
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349 iMp3Edit->InitTransport(mp3FileFormat); |
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350 |
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351 iClip = aClip; |
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352 |
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353 //-- Open file. --// |
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354 InitAndOpenFileL(aFileName, aFileHandle, aReadBufferSize); |
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355 |
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356 TPtr8 mp3DataBuf(mp3HeaderBytes, Kmp3BufSize); |
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357 |
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358 /*-- Read 1st bytes in. --*/ |
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359 BufferedFileSetFilePos(0); |
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360 BufferedFileRead((TDes8&) mp3DataBuf); |
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361 |
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362 |
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363 // -----------------------------------------> |
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364 |
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365 // Identify ID3v2 header: |
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366 |
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367 // more info in http://www.id3.org/ |
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368 |
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369 TInt tagLen = 0; |
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370 if (mp3DataBuf.Left(3).Compare(_L8("ID3")) == 0) |
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371 { |
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372 |
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373 const TInt KLenOffset = 6; |
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374 |
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375 BufferedFileSetFilePos(KLenOffset); |
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376 BufferedFileRead((TDes8&) mp3DataBuf); |
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377 |
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378 // ID3v2 tag found, calculate lenght: |
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379 |
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380 const TInt K2Pow7 = 128; |
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381 const TInt K2Pow14 = 16384; |
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382 const TInt K2Pow21 = 2097152; |
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383 |
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384 tagLen = K2Pow21 * mp3DataBuf[0] + |
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385 K2Pow14 * mp3DataBuf[1] + |
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386 K2Pow7 * mp3DataBuf[2] + |
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387 mp3DataBuf[3]; |
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388 |
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389 |
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390 tagLen += 10; // include ID3v2 header |
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391 |
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392 } |
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393 |
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394 // <----------------------------------------- |
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395 |
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396 BufferedFileSetFilePos(tagLen); |
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397 |
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398 TPtr8 vldDes( vldBuffer->Des() ); |
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399 |
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400 TInt bytesRead = BufferedFileRead((TDes8&) vldDes); |
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401 vldDes.SetLength(bytesRead); |
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402 |
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403 TBool result = Validate(vldDes); |
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404 |
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405 CleanupStack::PopAndDestroy(vldBuffer); |
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406 |
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407 if (!result) |
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408 { |
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409 User::Leave(KErrCorrupt); |
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410 } |
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411 |
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412 BufferedFileSetFilePos(tagLen); |
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413 bytesRead = BufferedFileRead((TDes8&) mp3DataBuf); |
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414 |
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415 /*-- Search start of 1st frame. --*/ |
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416 locate1stFrame = GetMP3Frame(mp3HeaderBytes, Kmp3BufSize, &frState, 1); |
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417 |
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418 /*-- If free format, we must determine the payload size of the frames. --*/ |
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419 if(locate1stFrame == 3) |
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420 { |
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421 int16 tmpBufLen; |
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422 uint8 tmpBuf[MIN_MP3_FREE_FORMAT_BUF_SIZE]; |
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423 |
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424 /*-- Switch to larger buffer. --*/ |
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425 tmpBufLen = (int16) (Kmp3BufSize - frState.readBytes); |
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426 COPY_MEMORY(tmpBuf, mp3HeaderBytes + frState.readBytes, tmpBufLen); |
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427 if(frState.readBytes) |
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428 { |
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429 int16 tmpBufLen2; |
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430 |
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431 tmpBufLen2 = (int16) (MIN_MP3_FREE_FORMAT_BUF_SIZE - tmpBufLen); |
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432 mp3DataBuf.Set(tmpBuf + tmpBufLen, tmpBufLen2, tmpBufLen2); |
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433 BufferedFileRead((TDes8&) mp3DataBuf); |
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434 } |
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435 |
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436 /*-- Determine the payload size. --*/ |
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437 locate1stFrame = GetMP3Frame(tmpBuf, MIN_MP3_FREE_FORMAT_BUF_SIZE, &frState, 3); |
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438 |
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439 /*-- If payload size known, then go back to the start of 1st frame. --*/ |
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440 if(locate1stFrame == 0) |
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441 { |
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442 isFreeFormatMP3 = 1; |
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443 |
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444 BufferedFileSetFilePos(0); |
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445 mp3DataBuf.Set(mp3HeaderBytes, Kmp3BufSize, Kmp3BufSize); |
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446 BufferedFileRead((TDes8&) mp3DataBuf); |
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447 |
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448 locate1stFrame = GetMP3Frame(mp3HeaderBytes, Kmp3BufSize, &frState, 0); |
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449 } |
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450 } |
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451 |
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452 if(locate1stFrame == 0) |
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453 isValidMP3 = 1; |
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454 |
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455 BufferedFileSetFilePos(0); |
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456 |
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457 TAudFileProperties prop; |
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458 GetPropertiesL(&prop); |
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459 |
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460 if (iProperties != 0) |
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461 { |
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462 |
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463 |
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464 // generate a header --------------> |
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465 |
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466 |
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467 TUint8 byte1 = 0xFF; // sync |
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468 TUint8 byte2 = 0xFB; // sync + V1,L3 (mp3), no CRC |
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469 |
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470 TBuf8<8> byte3B; |
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471 |
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472 switch (iProperties->iBitrate) |
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473 { |
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474 |
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475 case (32000): |
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476 { |
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477 byte3B.Append(_L8("0001")); |
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478 break; |
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479 } |
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480 case (40000): |
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481 { |
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482 byte3B.Append(_L8("0010")); |
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483 break; |
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484 } |
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485 case (48000): |
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486 { |
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487 byte3B.Append(_L8("0011")); |
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488 break; |
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489 } |
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490 case (56000): |
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491 { |
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492 byte3B.Append(_L8("0100")); |
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493 break; |
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494 } |
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495 case (64000): |
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496 { |
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497 byte3B.Append(_L8("0101")); |
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498 break; |
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499 } |
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500 case (80000): |
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501 { |
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502 byte3B.Append(_L8("0110")); |
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503 break; |
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504 } |
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505 case (96000): |
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506 { |
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507 byte3B.Append(_L8("0111")); |
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508 break; |
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509 } |
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510 case (112000): |
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511 { |
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512 byte3B.Append(_L8("1000")); |
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513 break; |
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514 } |
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515 case (128000): |
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516 { |
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517 byte3B.Append(_L8("1001")); |
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518 break; |
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519 } |
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520 case (160000): |
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521 { |
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522 byte3B.Append(_L8("1010")); |
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523 break; |
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524 } |
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525 case (192000): |
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526 { |
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527 byte3B.Append(_L8("1011")); |
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528 break; |
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529 } |
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530 case (224000): |
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531 { |
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532 byte3B.Append(_L8("1100")); |
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533 break; |
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534 } |
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535 case (256000): |
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536 { |
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537 byte3B.Append(_L8("1101")); |
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538 break; |
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539 } |
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540 case (320000): |
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541 { |
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542 byte3B.Append(_L8("1110")); |
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543 break; |
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544 } |
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545 default: |
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546 { |
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547 if ( iProperties->iBitrateMode == EAudVariable ) |
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548 { |
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549 // bitrate for silent frames in variable bitrate mode; use the lowest bitrate. |
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550 // However, mp3 is not an output format so this is not so relevant currently |
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551 byte3B.Append(_L8("0001")); |
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552 |
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553 } |
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554 else |
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555 { |
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556 |
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557 User::Leave(KErrGeneral); |
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558 } |
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559 break; |
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560 |
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561 } |
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562 |
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563 } |
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564 |
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565 switch (iProperties->iSamplingRate) |
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566 { |
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567 |
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568 case(44100): |
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569 { |
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570 byte3B.Append(_L8("00")); |
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571 break; |
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572 } |
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573 case(48000): |
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574 { |
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575 byte3B.Append(_L8("01")); |
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576 break; |
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577 } |
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578 case(32000): |
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579 { |
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580 byte3B.Append(_L8("10")); |
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581 break; |
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582 } |
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583 default: |
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584 { |
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585 User::Leave(KErrGeneral); |
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586 break; |
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587 } |
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588 } |
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589 |
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590 |
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591 byte3B.Append(_L8("00")); // padding + protection bits |
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592 |
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593 TBuf8<8> byte4B; |
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594 |
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595 switch (iProperties->iChannelMode) |
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596 { |
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597 |
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598 case(EAudStereo): |
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599 { |
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600 byte4B.Append(_L8("00")); |
|
601 break; |
|
602 } |
|
603 case(EAudDualChannel): |
|
604 { |
|
605 byte4B.Append(_L8("10")); |
|
606 break; |
|
607 } |
|
608 case(EAudSingleChannel): |
|
609 { |
|
610 byte4B.Append(_L8("11")); |
|
611 break; |
|
612 } |
|
613 default: |
|
614 { |
|
615 User::Leave(KErrGeneral); |
|
616 break; |
|
617 } |
|
618 } |
|
619 |
|
620 |
|
621 byte4B.Append(_L8("000")); // mode extension, |
|
622 // not copyrighted, |
|
623 |
|
624 if (iProperties->iOriginal) |
|
625 { |
|
626 byte4B.Append(_L8("100")); |
|
627 } |
|
628 else |
|
629 { |
|
630 byte4B.Append(_L8("000")); |
|
631 } |
|
632 //copy of original, no emphasis |
|
633 |
|
634 TInt frameLength; |
|
635 if ( iProperties->iBitrateMode == EAudVariable ) |
|
636 { |
|
637 // Use the lowest bitrate for silent frames in variable bitrate mode. |
|
638 // However, mp3 is not an output format so this is not so relevant currently |
|
639 frameLength = (144*32000)/(iProperties->iSamplingRate); |
|
640 } |
|
641 else |
|
642 { |
|
643 frameLength = (144*iProperties->iBitrate)/(iProperties->iSamplingRate); |
|
644 } |
|
645 |
|
646 iSilentFrame = HBufC8::NewL(frameLength); |
|
647 |
|
648 TUint byte3 = 0; |
|
649 ProcTools::Bin2Dec(byte3B, byte3); |
|
650 |
|
651 TUint byte4 = 0; |
|
652 ProcTools::Bin2Dec(byte4B, byte4); |
|
653 |
|
654 TPtr8 silentFramePtr(iSilentFrame->Des()); |
|
655 |
|
656 silentFramePtr.FillZ(frameLength); |
|
657 |
|
658 silentFramePtr[0] = byte1; |
|
659 silentFramePtr[1] = byte2; |
|
660 silentFramePtr[2] = static_cast<TUint8>(byte3); |
|
661 silentFramePtr[3] = static_cast<TUint8>(byte4); |
|
662 iSilentFrameDuration = ProcTools::MilliSeconds(iProperties->iFrameDuration); |
|
663 |
|
664 } |
|
665 |
|
666 if (aClip != 0) |
|
667 { |
|
668 iCutInTime = ProcTools::MilliSeconds(aClip->CutInTime()); |
|
669 |
|
670 } |
|
671 |
|
672 iDecoder = CProcDecoder::NewL(); |
|
673 |
|
674 iDecodingPossible = iDecoder->InitL(*iProperties, aTargetSampleRate, aChannelMode); |
|
675 |
|
676 iFrameHandler = CProcMP3FrameHandler::NewL(); |
|
677 |
|
678 |
|
679 if (iClip != 0 && iClip->Normalizing()) |
|
680 { |
|
681 SetNormalizingGainL(iFrameHandler); |
|
682 } |
|
683 |
|
684 } |
|
685 |
|
686 TBool CProcMP3InFileHandler::Validate(TDes8& aDes) |
|
687 { |
|
688 |
|
689 const TUint8* bufferPtr = aDes.Ptr(); |
|
690 |
|
691 TInt bufferSize = aDes.Length(); |
|
692 |
|
693 TInt scannedBuffer = 0; |
|
694 TInt lenMetaData = 0; |
|
695 TInt syncOffset = 0; |
|
696 TInt bufferPosition = 0; |
|
697 |
|
698 if (lenMetaData == 0) |
|
699 { |
|
700 syncOffset = 0; |
|
701 lenMetaData = ID3HeaderLength(aDes, bufferPosition); |
|
702 } |
|
703 |
|
704 TInt bufferRemaining = bufferSize; |
|
705 |
|
706 while (lenMetaData > 0) |
|
707 { |
|
708 if (lenMetaData >= bufferRemaining) |
|
709 { |
|
710 // this buffer contains all metadata |
|
711 syncOffset += bufferRemaining; |
|
712 lenMetaData -= bufferRemaining; |
|
713 return KErrCorrupt; |
|
714 } |
|
715 else |
|
716 { |
|
717 syncOffset += lenMetaData; |
|
718 scannedBuffer += lenMetaData; |
|
719 // be sure to check for following id3 tags |
|
720 bufferRemaining = bufferSize - scannedBuffer; |
|
721 bufferPosition = scannedBuffer; |
|
722 lenMetaData = ID3HeaderLength(aDes, bufferPosition); |
|
723 } |
|
724 } |
|
725 |
|
726 |
|
727 TInt seekOffset = 0; |
|
728 bufferPosition = scannedBuffer; |
|
729 |
|
730 seekOffset = SeekSync(aDes, bufferPosition); |
|
731 |
|
732 syncOffset += seekOffset; // offset to this point from content beginning |
|
733 scannedBuffer += seekOffset; // offset to this point in this buffer |
|
734 |
|
735 bufferPosition = scannedBuffer; |
|
736 |
|
737 if (seekOffset == bufferSize) |
|
738 { |
|
739 return EFalse; |
|
740 } |
|
741 |
|
742 return ETrue; |
|
743 |
|
744 } |
|
745 |
|
746 |
|
747 TInt CProcMP3InFileHandler::SeekSync(TDes8& aDes, TInt aBufPos) |
|
748 { |
|
749 const TUint bufStart = aBufPos; |
|
750 |
|
751 TInt bufLen = aDes.Length(); |
|
752 const TUint8* buf = aDes.Ptr() + bufStart; |
|
753 const TInt KMaxFrames = 3; // number of frames to check |
|
754 const TInt KNotFound = bufLen; // sync not found position |
|
755 |
|
756 TInt i = 0; |
|
757 TInt syncPos = KNotFound; |
|
758 TInt maxSeek = KMaxFrames; |
|
759 TInt bitRate = 0; |
|
760 |
|
761 const TUint8* endPtr = buf+bufLen-bufStart; |
|
762 |
|
763 // Seek a valid frame candidate byte by byte until a valid frame |
|
764 // is found or all bytes have been checked. |
|
765 while (buf < endPtr && syncPos == KNotFound) |
|
766 { |
|
767 TInt seekCount = 0; |
|
768 const TUint8* framePtr = buf; |
|
769 TInt frameBufLen = bufLen; |
|
770 syncPos = i; |
|
771 |
|
772 // Check the validity of this frame candidate and the nearest next |
|
773 // frames. If they are not OK, syncPos will be set to KNotFound. |
|
774 while (framePtr < endPtr && syncPos != KNotFound && seekCount < maxSeek) |
|
775 { |
|
776 |
|
777 TInt length = FrameInfo(framePtr, frameBufLen, bitRate); |
|
778 |
|
779 if (length == 0) |
|
780 { |
|
781 syncPos = KNotFound; |
|
782 } |
|
783 |
|
784 if ((length > 0) && (bitRate < 0)) |
|
785 { |
|
786 maxSeek = 1; // free formatcase |
|
787 } |
|
788 framePtr += length; |
|
789 frameBufLen -= length; |
|
790 seekCount++; |
|
791 |
|
792 // consider SYNC not found if we reach end of buffer before finding 3 SYNC frames |
|
793 if ((framePtr >= endPtr) && (seekCount < maxSeek)) |
|
794 { |
|
795 syncPos = KNotFound; |
|
796 buf += (bufLen-1); // force an exit from while loop |
|
797 } |
|
798 |
|
799 } |
|
800 buf++; bufLen--; i++; |
|
801 } |
|
802 return syncPos; |
|
803 } |
|
804 |
|
805 TInt CProcMP3InFileHandler::FrameInfo(const TUint8* aBuf,TInt aBufLen,TInt& aBitRate) |
|
806 { |
|
807 TInt length = 0; |
|
808 TUint temp; |
|
809 TUint lTempVal; |
|
810 |
|
811 TInt samplingRate = 0; |
|
812 TInt id = 0; |
|
813 TInt Padding = 0; |
|
814 |
|
815 if (aBufLen >= KRawMp3FrameHeaderSize) |
|
816 { |
|
817 // Extract header fields to aInfo and check their bit syntax |
|
818 // (including the sync word!). If the syntax is not OK the length |
|
819 // is set to zero. |
|
820 |
|
821 temp = 0; |
|
822 temp = aBuf[0] << 24; |
|
823 temp |= (aBuf[1] << 16); |
|
824 temp |= (aBuf[2] << 8); |
|
825 temp |= aBuf[3]; |
|
826 if (((temp >> 21) & 0x7FF) != 0x7FF) |
|
827 { |
|
828 return length; |
|
829 } |
|
830 |
|
831 lTempVal = (temp >> 19) & 0x03; |
|
832 switch (lTempVal) |
|
833 { |
|
834 case 0: |
|
835 id = 2; // MPEG2.5 |
|
836 break; |
|
837 case 1: |
|
838 return length; |
|
839 case 2: |
|
840 id = 0; // MPEG 2 |
|
841 break; |
|
842 case 3: |
|
843 id = 1; // MPEG 1 |
|
844 break; |
|
845 } |
|
846 |
|
847 lTempVal = (temp >> 17) & 0x03; |
|
848 if (lTempVal != 1) |
|
849 { |
|
850 return length; |
|
851 } |
|
852 |
|
853 lTempVal = (temp >> 12) & 0x0F; |
|
854 aBitRate = cBitRateTable[id][lTempVal]*1000; |
|
855 |
|
856 if (aBitRate == 0) |
|
857 { |
|
858 return length; |
|
859 } |
|
860 |
|
861 lTempVal = (temp >> 10) & 0x03; |
|
862 if (lTempVal == 3) |
|
863 { |
|
864 return length; |
|
865 } |
|
866 else |
|
867 { |
|
868 samplingRate = cSamplingFrequencyTable[id][lTempVal]; |
|
869 } |
|
870 |
|
871 Padding = (temp >> 9) & 0x01; |
|
872 |
|
873 lTempVal = (temp >> 6) & 0x03; |
|
874 |
|
875 |
|
876 if (lTempVal == 3) |
|
877 { |
|
878 } |
|
879 else |
|
880 { |
|
881 } |
|
882 |
|
883 if (aBitRate == -1) |
|
884 { |
|
885 // For free mode operation |
|
886 length = KRawMp3MaxFrameSize; |
|
887 } |
|
888 |
|
889 if (samplingRate > 0 && aBitRate > 0) |
|
890 { |
|
891 length = (144*aBitRate)/samplingRate; |
|
892 |
|
893 if (id != 1) |
|
894 { |
|
895 length >>= 1; /*for MPEG2 and MPEG2.5 */ |
|
896 } |
|
897 |
|
898 if (Padding) |
|
899 { |
|
900 length++; |
|
901 } |
|
902 } |
|
903 } |
|
904 return length; |
|
905 } |
|
906 |
|
907 |
|
908 TInt CProcMP3InFileHandler::ID3HeaderLength(TDes8& aDes, TInt aPosition) |
|
909 { |
|
910 TInt lenMetaData; |
|
911 TUint offset = aPosition; |
|
912 |
|
913 _LIT8 (KTagID3, "ID3"); |
|
914 TPtrC8 searchBuf; |
|
915 |
|
916 // Set search buffer |
|
917 searchBuf.Set(aDes); |
|
918 |
|
919 const TUint8* ptr = aDes.Ptr(); |
|
920 TInt len = aDes.Length(); |
|
921 searchBuf.Set(ptr+offset, len-offset); |
|
922 |
|
923 TInt startTagPos = searchBuf.Find (KTagID3); |
|
924 if (startTagPos == KErrNotFound || startTagPos != 0) |
|
925 { |
|
926 lenMetaData = 0; |
|
927 } |
|
928 else |
|
929 { |
|
930 lenMetaData = searchBuf[KSizeOfTagOffset]; |
|
931 lenMetaData = ((lenMetaData << 8) | (searchBuf[KSizeOfTagOffset+1] << 1)) >> 1; |
|
932 lenMetaData = ((lenMetaData << 8) | (searchBuf[KSizeOfTagOffset+2] << 1)) >> 1; |
|
933 lenMetaData = ((lenMetaData << 8) | (searchBuf[KSizeOfTagOffset+3] << 1)) >> 1; |
|
934 lenMetaData += 10; |
|
935 } |
|
936 |
|
937 return lenMetaData; |
|
938 } |
|
939 |
|
940 |
|
941 int16 |
|
942 CProcMP3InFileHandler::GetMP3Bitrate(void) |
|
943 { |
|
944 |
|
945 |
|
946 TMpFrameState frState; |
|
947 int16 bitRate, frameFound, offsetBytes; |
|
948 TPtr8 mp3DataBuf(mp3HeaderBytes, Kmp3BufSize); |
|
949 |
|
950 bitRate = 0; |
|
951 isVbrMP3 = 0; |
|
952 |
|
953 /*-- Search start of 1st frame. --*/ |
|
954 BufferedFileRead((TDes8&) mp3DataBuf); |
|
955 frameFound = GetMP3Frame(mp3HeaderBytes, Kmp3BufSize, &frState, 0); |
|
956 |
|
957 /*-- How many unknown bytes at the start of the file? --*/ |
|
958 offsetBytes = static_cast<int16>(frState.totalReadBytes + (frState.readBytes - frState.headerBytes)); |
|
959 |
|
960 /*-- Get bitrate information. --*/ |
|
961 if(frameFound == 0) |
|
962 { |
|
963 if(isFreeFormatMP3) |
|
964 bitRate = iMp3Edit->EstimateBitrate(mp3FileFormat, 0); |
|
965 |
|
966 /* |
|
967 * Since the mp3 stream is not using free format, we must somehow |
|
968 * determine the (average) bitrate. Yes, mp3 header includes |
|
969 * information about the bitrate but that's valid only for |
|
970 * the current frame. In case variable coding is used the bitrate |
|
971 * can vary quite a lot depending on the goodness of the encoder |
|
972 * and signal conditions. Also if the mp3 stream is already an edited |
|
973 * version, the bitrate can change quite radicly between different portions |
|
974 * of the file. At the moment we determine the avarage frame size by |
|
975 * dividing the file into 'Kmp3BitrateRegions' regions of equal width |
|
976 * and from each region we determine the average frame size. The 1st |
|
977 * 'Kmp3BitrateNumFrames' frames are used from each region. The final |
|
978 * average frame size is then averaged across each region. |
|
979 * The reason why the bitrate estimation is so complicated is related |
|
980 * to seeking. At the moment we jump to the desired position and in order |
|
981 * to make this jump as accurate as possible we must have accurate information |
|
982 * about the average frame size. The advantages of jumping is that it's fast, |
|
983 * the side effect might be that we jump to incorrect position, the deviation |
|
984 * is negligible with constant bitrate streams but with variable bitrate streams |
|
985 * this can lead to quite large deviations, especially if the stream is using |
|
986 * the full range of allowed bitrates. Fortunately, this is not the case in |
|
987 * typical mp3 streams but after a series of editing we might have a |
|
988 * file where bitrate changes are significant. Of course this means also that |
|
989 * the quality is not so good either, so probably the user will never create |
|
990 * such files due to poor sound quality... |
|
991 * |
|
992 * The other approach would be the loop each frame and store frame positions, |
|
993 * let's say for every second. Works great, but the side effect is quite considerable |
|
994 * delay, since it certainly takes some time to process 5000-10000 mp3 frames... |
|
995 */ |
|
996 else |
|
997 { |
|
998 int32 fPosOffset[Kmp3BitrateRegions]; |
|
999 TInt fileSize, stepSize, nRegions, byteOffset; |
|
1000 |
|
1001 if(iFile.Size(fileSize) == KErrNone) |
|
1002 { |
|
1003 uint8 idx; |
|
1004 int32 nFrames; |
|
1005 int16 prevBitRate; |
|
1006 TMPEG_Header *header; |
|
1007 TInt ProcessingOnGoing; |
|
1008 |
|
1009 fileSize -= offsetBytes; |
|
1010 if(fileSize < 0) |
|
1011 return (0); |
|
1012 |
|
1013 header = &mp3FileFormat->header; |
|
1014 |
|
1015 /*-- Build the data region boundaries. --*/ |
|
1016 nRegions = 1; |
|
1017 stepSize = fileSize / Kmp3BitrateRegions; |
|
1018 byteOffset = stepSize; |
|
1019 fPosOffset[0] = stepSize; |
|
1020 TInt i = 0; |
|
1021 for(i = 1; i < Kmp3BitrateRegions - 1; i++) |
|
1022 { |
|
1023 byteOffset += stepSize; |
|
1024 if(byteOffset < fileSize) |
|
1025 { |
|
1026 nRegions++; |
|
1027 fPosOffset[i] = byteOffset; |
|
1028 } |
|
1029 else break; |
|
1030 } |
|
1031 |
|
1032 idx = 0; |
|
1033 nFrames = 0; |
|
1034 ProcessingOnGoing = 1; |
|
1035 mp3FileFormat->aveFrameLen = 0; |
|
1036 |
|
1037 prevBitRate = bit_rate(header); |
|
1038 |
|
1039 /*-- Process each data region and accumulate the frame size. --*/ |
|
1040 while(ProcessingOnGoing) |
|
1041 { |
|
1042 TInt rValue, bufSize; |
|
1043 |
|
1044 for(i = 0; i < Kmp3BitrateNumFrames; i++) |
|
1045 { |
|
1046 TInt fLen; |
|
1047 |
|
1048 nFrames++; |
|
1049 fLen = static_cast<int16>(frState.frameBytes + frState.headerBytes); |
|
1050 |
|
1051 frameFound = 2; |
|
1052 mp3FileFormat->aveFrameLen += fLen; |
|
1053 |
|
1054 /*-- Check whether bitrate changed => variable bitrate. --*/ |
|
1055 if(!isVbrMP3) |
|
1056 if(prevBitRate != bit_rate(header)) |
|
1057 isVbrMP3 = 1; |
|
1058 |
|
1059 /* |
|
1060 * Skip the payload, remember that the input buffer has 'Kmp3BufSize' |
|
1061 * bytes already that belong to the current mp3 frame. These bytes |
|
1062 * need to be compensated before jumping to the start of next frame. |
|
1063 */ |
|
1064 fLen -= static_cast<int16>(Kmp3BufSize - (frState.readBytes - frState.headerBytes)); |
|
1065 if(fLen < 0) fLen = 1; |
|
1066 rValue = BufferedFileSetFilePos(BufferedFileGetFilePos() + fLen); |
|
1067 |
|
1068 if(rValue) |
|
1069 { |
|
1070 /*-- Read new data for parsing of next frame. --*/ |
|
1071 bufSize = BufferedFileRead((TDes8&) mp3DataBuf); |
|
1072 if(bufSize < Kmp3BufSize) |
|
1073 ZERO_MEMORY(mp3HeaderBytes + bufSize, Kmp3BufSize - bufSize); |
|
1074 |
|
1075 frameFound = GetMP3Frame(mp3HeaderBytes, Kmp3BufSize, &frState, 0); |
|
1076 } |
|
1077 |
|
1078 if(frameFound != 0) |
|
1079 { |
|
1080 ProcessingOnGoing = 0; |
|
1081 break; |
|
1082 } |
|
1083 } |
|
1084 |
|
1085 if(ProcessingOnGoing && idx < nRegions) |
|
1086 { |
|
1087 frameFound = 2; |
|
1088 |
|
1089 /*-- Seek to start of next data region. --*/ |
|
1090 rValue = BufferedFileSetFilePos(fPosOffset[idx++]); |
|
1091 |
|
1092 if(rValue) |
|
1093 { |
|
1094 /*-- Read new data and search start of frame. --*/ |
|
1095 bufSize = BufferedFileRead((TDes8&) mp3DataBuf); |
|
1096 if(bufSize < Kmp3BufSize) |
|
1097 ZERO_MEMORY(mp3HeaderBytes + bufSize, Kmp3BufSize - bufSize); |
|
1098 |
|
1099 frameFound = GetMP3Frame(mp3HeaderBytes, Kmp3BufSize, &frState, 0); |
|
1100 } |
|
1101 |
|
1102 if(frameFound != 0) |
|
1103 ProcessingOnGoing = 0; |
|
1104 } |
|
1105 else ProcessingOnGoing = 0; |
|
1106 } |
|
1107 |
|
1108 if(frameFound != 0) |
|
1109 { |
|
1110 mp3FileFormat->execState.execMode = GLITCH_FREE; |
|
1111 mp3FileFormat->header.header = mp3FileFormat->headerOld.header; |
|
1112 } |
|
1113 |
|
1114 /*-- Average frame length, in bytes. --*/ |
|
1115 if(nFrames) |
|
1116 { |
|
1117 FLOAT tmp; |
|
1118 |
|
1119 tmp = mp3FileFormat->aveFrameLen / (FLOAT) nFrames; |
|
1120 mp3FileFormat->aveFrameLen = (int16) (tmp + 0.5f); |
|
1121 } |
|
1122 |
|
1123 /*-- This is our estimated bitrate. --*/ |
|
1124 bitRate = iMp3Edit->EstimateBitrate(mp3FileFormat, 1); |
|
1125 } |
|
1126 } |
|
1127 } |
|
1128 return (bitRate); |
|
1129 |
|
1130 } |
|
1131 |
|
1132 void |
|
1133 CProcMP3InFileHandler::GetPropertiesL(TAudFileProperties* aProperties) |
|
1134 { |
|
1135 PRINT((_L("CProcMP3InFileHandler::GetPropertiesL in") )); |
|
1136 |
|
1137 |
|
1138 if (iProperties != 0) |
|
1139 { |
|
1140 *aProperties = *iProperties; |
|
1141 return; |
|
1142 } |
|
1143 |
|
1144 if(iFileOpen) |
|
1145 { |
|
1146 TInt origFilePos = iFilePos; |
|
1147 |
|
1148 aProperties->iFileFormat = EAudFormatUnrecognized; |
|
1149 aProperties->iAudioType = EAudTypeUnrecognized; |
|
1150 aProperties->iAudioTypeExtension = EAudExtensionTypeNoExtension; |
|
1151 aProperties->iBitrate = 0; |
|
1152 aProperties->iBitrateMode = EAudBitrateModeNotRecognized; |
|
1153 aProperties->iChannelMode = EAudChannelModeNotRecognized; |
|
1154 aProperties->iDuration = 0; |
|
1155 aProperties->iSamplingRate = 0; |
|
1156 aProperties->iFrameLen = 0; |
|
1157 aProperties->iFrameCount = 0; |
|
1158 |
|
1159 /*-- First mp3 frame found? --*/ |
|
1160 if(isValidMP3) |
|
1161 { |
|
1162 TMPEG_Header *header; |
|
1163 |
|
1164 header = &mp3FileFormat->header; |
|
1165 |
|
1166 /*-- Seek to start of file. --*/ |
|
1167 BufferedFileSetFilePos(0); |
|
1168 |
|
1169 |
|
1170 |
|
1171 if (version(header) != 1) |
|
1172 { |
|
1173 PRINT((_L("CProcMP4InFileHandler::GetPropertiesL header unsupported, leaving") )); |
|
1174 User::Leave(KErrNotSupported); |
|
1175 return; |
|
1176 } |
|
1177 |
|
1178 |
|
1179 /*-- Determine bitrate. --*/ |
|
1180 aProperties->iBitrate = GetMP3Bitrate(); |
|
1181 |
|
1182 |
|
1183 if(aProperties->iBitrate) |
|
1184 { |
|
1185 TInt fileSize; |
|
1186 |
|
1187 iFile.Size(fileSize); |
|
1188 |
|
1189 aProperties->iAudioType = EAudMP3; |
|
1190 aProperties->iFileFormat = EAudFormatMP3; |
|
1191 aProperties->iBitrateMode = (!isVbrMP3) ? EAudConstant : EAudVariable; |
|
1192 |
|
1193 /*-- Determine channel mode. --*/ |
|
1194 switch(mode(header)) |
|
1195 { |
|
1196 case 0: |
|
1197 case 1: |
|
1198 aProperties->iChannelMode = EAudStereo; |
|
1199 break; |
|
1200 |
|
1201 case 2: |
|
1202 aProperties->iChannelMode = EAudDualChannel; |
|
1203 break; |
|
1204 |
|
1205 case 3: |
|
1206 default: |
|
1207 aProperties->iChannelMode = EAudSingleChannel; |
|
1208 break; |
|
1209 } |
|
1210 |
|
1211 /*-- Estimate duration. --*/ |
|
1212 TInt64 tmp = (TInt64)iMp3Edit->FileLengthInMs(mp3FileFormat, fileSize) * 1000; |
|
1213 TTimeIntervalMicroSeconds durationMicro(tmp); |
|
1214 aProperties->iDuration = durationMicro; |
|
1215 |
|
1216 aProperties->iSamplingRate = frequency(header); |
|
1217 |
|
1218 // Check that the sample rate is supported |
|
1219 if( (aProperties->iSamplingRate != KAedSampleRate8kHz) && |
|
1220 (aProperties->iSamplingRate != KAedSampleRate11kHz) && |
|
1221 (aProperties->iSamplingRate != KAedSampleRate16kHz) && |
|
1222 (aProperties->iSamplingRate != KAedSampleRate22kHz) && |
|
1223 (aProperties->iSamplingRate != KAedSampleRate24kHz) && |
|
1224 (aProperties->iSamplingRate != KAedSampleRate32kHz) && |
|
1225 (aProperties->iSamplingRate != KAedSampleRate44kHz) && |
|
1226 (aProperties->iSamplingRate != KAedSampleRate48kHz) ) |
|
1227 { |
|
1228 User::Leave(KErrNotSupported); |
|
1229 } |
|
1230 |
|
1231 aProperties->iFrameLen = mp3FileFormat->aveFrameLen; |
|
1232 |
|
1233 // casting for PC-Lint |
|
1234 tmp = (TInt64) (TInt)(iMp3Edit->GetFrameTime(mp3FileFormat) * 1000); |
|
1235 aProperties->iFrameDuration = tmp; |
|
1236 aProperties->iFrameCount = ProcTools::GetTInt((aProperties->iDuration).Int64()/(aProperties->iFrameDuration).Int64()); |
|
1237 |
|
1238 if (((TUint32)header->header & 0x4) != 0) |
|
1239 { |
|
1240 |
|
1241 aProperties->iOriginal = ETrue; |
|
1242 |
|
1243 } |
|
1244 |
|
1245 BufferedFileSetFilePos(origFilePos); |
|
1246 } |
|
1247 } |
|
1248 else |
|
1249 { |
|
1250 PRINT((_L("CProcMP4InFileHandler::GetPropertiesL could not parse frames, leaving") )); |
|
1251 User::Leave(KErrNotSupported); |
|
1252 } |
|
1253 } |
|
1254 else |
|
1255 { |
|
1256 TAudPanic::Panic(TAudPanic::EInternal); |
|
1257 } |
|
1258 |
|
1259 // bitrate is bytes not kilobytes |
|
1260 aProperties->iBitrate *= 1000; |
|
1261 |
|
1262 |
|
1263 if (iProperties == 0) |
|
1264 { |
|
1265 iProperties = new (ELeave) TAudFileProperties; |
|
1266 *iProperties = *aProperties; |
|
1267 |
|
1268 } |
|
1269 |
|
1270 } |
|
1271 |
|
1272 TBool |
|
1273 CProcMP3InFileHandler::SeekAudioFrame(TInt32 aTime) |
|
1274 { |
|
1275 TBool rValue = EFalse; |
|
1276 |
|
1277 |
|
1278 |
|
1279 if(!iFileOpen) |
|
1280 { |
|
1281 TAudPanic::Panic(TAudPanic::EInternal); |
|
1282 } |
|
1283 |
|
1284 if(isValidMP3) |
|
1285 { |
|
1286 int32 fPos; |
|
1287 |
|
1288 mp3FileFormat->aveFrameLen = iProperties->iFrameLen; |
|
1289 fPos = iMp3Edit->GetSeekOffset(mp3FileFormat, aTime); |
|
1290 |
|
1291 BufferedFileSetFilePos(fPos); |
|
1292 |
|
1293 iCurrentTimeMilliseconds = aTime; |
|
1294 |
|
1295 rValue = ETrue; |
|
1296 } |
|
1297 |
|
1298 |
|
1299 |
|
1300 return (rValue); |
|
1301 } |
|
1302 |
|
1303 TBool |
|
1304 CProcMP3InFileHandler::SeekCutInFrame() |
|
1305 { |
|
1306 iCurrentTimeMilliseconds = iCutInTime; |
|
1307 |
|
1308 return SeekAudioFrame(iCutInTime); |
|
1309 } |
|
1310 |
|
1311 |
|
1312 TBool |
|
1313 CProcMP3InFileHandler::GetDurationL(TInt32& aTime, TInt& aFrameAmount) |
|
1314 { |
|
1315 TBool rValue = EFalse; |
|
1316 |
|
1317 |
|
1318 |
|
1319 if(!iFileOpen) |
|
1320 { |
|
1321 TAudPanic::Panic(TAudPanic::EInternal); |
|
1322 } |
|
1323 |
|
1324 aTime = 0; |
|
1325 aFrameAmount = 0; |
|
1326 |
|
1327 if(isValidMP3) |
|
1328 { |
|
1329 TInt filePos; |
|
1330 TAudFileProperties aProperties; |
|
1331 |
|
1332 filePos = iFilePos; |
|
1333 |
|
1334 GetPropertiesL(&aProperties); |
|
1335 |
|
1336 if(aProperties.iBitrate) |
|
1337 { |
|
1338 rValue = ETrue; |
|
1339 aTime = ProcTools::MilliSeconds(aProperties.iDuration); |
|
1340 aFrameAmount = aTime / iMp3Edit->GetFrameTime(mp3FileFormat); |
|
1341 } |
|
1342 |
|
1343 BufferedFileSetFilePos(filePos); |
|
1344 } |
|
1345 |
|
1346 |
|
1347 return (rValue); |
|
1348 } |
|
1349 |
|
1350 |
|
1351 TBool |
|
1352 CProcMP3InFileHandler::SetNormalizingGainL(const CProcFrameHandler* aFrameHandler) |
|
1353 { |
|
1354 |
|
1355 HBufC8* point = 0; |
|
1356 TInt siz; |
|
1357 TInt32 tim = 0; |
|
1358 TInt maxGain = 0; |
|
1359 RArray<TInt> gains; |
|
1360 TInt maxAverage = 0; |
|
1361 TInt tmpGain = 0; |
|
1362 TInt gainCounter = 0; |
|
1363 TInt timeNow = 0; |
|
1364 TBitStream bs; |
|
1365 |
|
1366 while(GetEncAudioFrameL(point, siz, tim)) |
|
1367 { |
|
1368 timeNow += tim; |
|
1369 ((CProcMP3FrameHandler*) aFrameHandler)->GetMP3Gains(point, gains, maxGain, bs); |
|
1370 |
|
1371 for (TInt a = 0 ; a < gains.Count() ; a = a+2) |
|
1372 { |
|
1373 tmpGain += gains[a]; |
|
1374 gainCounter++; |
|
1375 } |
|
1376 gains.Reset(); |
|
1377 |
|
1378 if (timeNow > 1000) |
|
1379 { |
|
1380 if (tmpGain/gainCounter > maxAverage) |
|
1381 { |
|
1382 maxAverage = tmpGain/gainCounter; |
|
1383 } |
|
1384 |
|
1385 timeNow = 0; |
|
1386 tmpGain = 0; |
|
1387 gainCounter = 0; |
|
1388 } |
|
1389 |
|
1390 delete point; |
|
1391 |
|
1392 } |
|
1393 |
|
1394 // bigger value makes normalizing more efficient, but makes |
|
1395 // dynamic compression more likely to occur |
|
1396 TInt NormalizingFactor = 179; |
|
1397 if (iProperties->iBitrate > 20000 && iProperties->iBitrate < 40000) |
|
1398 { |
|
1399 |
|
1400 // 32 kBit/s |
|
1401 NormalizingFactor = 187; |
|
1402 |
|
1403 } |
|
1404 else if (iProperties->iBitrate > 40000 && iProperties->iBitrate < 80000) |
|
1405 { |
|
1406 // 64 kBit/s |
|
1407 NormalizingFactor = 181; |
|
1408 |
|
1409 } |
|
1410 |
|
1411 |
|
1412 else if (iProperties->iBitrate > 80000 && iProperties->iBitrate < 140000) |
|
1413 { |
|
1414 // 128 kBit/s |
|
1415 if (iProperties->iChannelMode == EAudSingleChannel) |
|
1416 NormalizingFactor = 170; |
|
1417 else |
|
1418 NormalizingFactor = 179; |
|
1419 |
|
1420 } |
|
1421 else if (iProperties->iBitrate > 140000) |
|
1422 { |
|
1423 // 256 kBit/s |
|
1424 if (iProperties->iChannelMode == EAudSingleChannel) |
|
1425 NormalizingFactor = 155; |
|
1426 else |
|
1427 NormalizingFactor = 167; |
|
1428 |
|
1429 } |
|
1430 else |
|
1431 { |
|
1432 |
|
1433 if (iProperties->iChannelMode == EAudSingleChannel) |
|
1434 NormalizingFactor = 170; |
|
1435 |
|
1436 } |
|
1437 |
|
1438 |
|
1439 TInt gainBoost = (NormalizingFactor-maxAverage)*3; |
|
1440 |
|
1441 if (gainBoost < 0) gainBoost = 0; |
|
1442 |
|
1443 iNormalizingMargin = static_cast<TInt8>(gainBoost); |
|
1444 |
|
1445 SeekAudioFrame(0); |
|
1446 |
|
1447 mp3FileFormat->execState.a0_s16[0] = 0; |
|
1448 mp3FileFormat->execState.a0_s16[1] = 0; |
|
1449 mp3FileFormat->execState.a0_s16[2] = 0; |
|
1450 |
|
1451 mp3FileFormat->execState.a0_u32[0] = 0; |
|
1452 mp3FileFormat->execState.a0_u32[1] = 0; |
|
1453 mp3FileFormat->execState.a0_u32[2] = 0; |
|
1454 |
|
1455 |
|
1456 |
|
1457 |
|
1458 return ETrue; |
|
1459 |
|
1460 |
|
1461 } |
|
1462 |
|
1463 |
|