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1 /* |
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2 * Copyright (c) 2006 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: The functions in this module implements the specific behavior |
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15 * for the advanced audio converter class for configuration of |
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16 * hardware accelerated codec. |
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17 * |
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18 */ |
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19 |
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20 |
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21 // INCLUDE FILES |
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22 #include "MP3AudioPlayControllerDecoder.h" |
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23 #include "DebugMacros.h" |
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24 #include <MmfPanicCodes.h> |
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25 #include <Mmfcodec.h> |
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26 |
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27 const TUint KRawMp3MaxFrameSize = 1441; |
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28 const TUint KSizeOfInBuffer = 2*KRawMp3MaxFrameSize; |
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29 const TInt KRawMp3FrameHeaderSize = 5; |
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30 |
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31 class TAudioFrameInfo |
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32 { |
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33 public: |
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34 TInt iMode; // encoding mode |
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35 TInt iBitRate; // bitrate (bit/s) |
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36 TInt iSamplingRate; // sampling frequency (Hz) |
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37 TInt iChannels; // number of channels |
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38 TInt iFrameSize; // encoded size (bytes) |
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39 TInt iFrameSamples; // samples per frame |
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40 TInt iSamplingRateOut; // sampling frequency after conversion (Hz) |
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41 TInt iChannelsOut; // number of audio channels after conversion (1 or 2) |
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42 TInt iFrameSamplesOut; // decoded size after conversion (samples per frame) |
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43 TInt iPadding; // padding flag (TRUE or FALSE, TRUE if p slot exists) |
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44 TInt iId; // id of algorithm (1 MPEG-1, 0 MPEG-2) |
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45 }; |
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46 |
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47 // Bit rates in bits/sec supported by MPEG2, MPEG1 and MPEG2.5 respectively |
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48 const TInt16 cBitRateTable[3][16] = |
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49 { |
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50 {-1,8,16,24,32,40,48,56,64,80,96,112,128,144,160,0}, |
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51 {-1,32,40,48,56,64,80,96,112,128,160,192,224,256,320,0}, |
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52 {-1,8,16,24,32,40,48,56,64,80,96,112,128,144,160,0}, |
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53 }; |
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54 |
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55 // Sampling frequencies supported by MPEG2, MPEG1 and MPEG2.5 respectively |
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56 const TUint16 cSamplingFrequencyTable[3][4] = |
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57 { |
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58 {22050,24000,16000,0}, |
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59 {44100,48000,32000,0}, |
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60 {11025,12000,8000,0}, |
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61 }; |
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62 |
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63 // ============================ MEMBER FUNCTIONS =============================== |
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64 |
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65 // ----------------------------------------------------------------------------- |
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66 // C++ default constructor can NOT contain any code, that |
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67 // might leave. |
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68 // ----------------------------------------------------------------------------- |
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69 // |
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70 CMP3AudioPlayControllerDecoder::CMP3AudioPlayControllerDecoder() |
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71 : CAdvancedAudioDecoder(CActive::EPriorityStandard) |
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72 { |
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73 DP0(_L("CMP3AudioPlayControllerDecoder::CMP3AudioPlayControllerDecoder - Hardware Accelerated")); |
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74 iMaxFrameSize = KRawMp3MaxFrameSize; |
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75 iSizeOfInBuffer = KSizeOfInBuffer; |
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76 } |
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77 |
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78 // ----------------------------------------------------------------------------- |
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79 // CMP3AudioPlayControllerDecoder::ConstructL |
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80 // Symbian 2nd phase constructor can leave. |
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81 // ----------------------------------------------------------------------------- |
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82 // |
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83 void CMP3AudioPlayControllerDecoder::ConstructL() |
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84 { |
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85 DP1(_L("CMP3AudioPlayControllerDecoder::ConstructL"), this); |
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86 |
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87 iFrameTable = CFrameTable::NewL(); |
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88 |
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89 RenderEnable(); |
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90 UnMarkPlayEnd(); |
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91 Enable(); |
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92 |
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93 CActiveScheduler::Add(this); |
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94 } |
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95 |
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96 // ----------------------------------------------------------------------------- |
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97 // C++ default constructor can NOT contain any code, that |
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98 // might leave. |
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99 // ----------------------------------------------------------------------------- |
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100 // |
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101 CMP3AudioPlayControllerDecoder* CMP3AudioPlayControllerDecoder::NewL() |
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102 { |
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103 DP0(_L("CMP3AudioPlayControllerDecoder::NewL")); |
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104 |
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105 CMP3AudioPlayControllerDecoder* self = new(ELeave) CMP3AudioPlayControllerDecoder(); |
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106 CleanupStack::PushL(self); |
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107 self->ConstructL(); |
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108 CleanupStack::Pop(self); |
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109 return self; |
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110 } |
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111 |
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112 // Destructor |
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113 CMP3AudioPlayControllerDecoder::~CMP3AudioPlayControllerDecoder() |
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114 { |
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115 DP0(_L("CMP3AudioPlayControllerDecoder::~CMP3AudioPlayControllerDecoder")); |
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116 delete iFrameTable; |
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117 } |
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118 |
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119 TInt CMP3AudioPlayControllerDecoder::CodecConfig(RArray<TInt>& aConfigData) |
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120 { |
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121 TInt status = KErrNone; |
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122 TInt sampFreq = ((RArray<TInt>&) aConfigData)[5]; |
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123 TInt samplesPerFrame = ((RArray<TInt>&) aConfigData)[8]; |
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124 iFrameTable->InitFrameTable(sampFreq, samplesPerFrame); |
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125 return status; |
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126 } |
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127 |
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128 // ----------------------------------------------------------------------------- |
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129 // CMP3AudioPlayControllerDecoder::ResetL |
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130 // Resets configuration data and configures the codec. |
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131 // ----------------------------------------------------------------------------- |
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132 // |
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133 void CMP3AudioPlayControllerDecoder::ResetL() |
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134 { |
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135 DP0(_L ("CMP3AudioPlayControllerDecoder::Reset - Enter")); |
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136 |
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137 delete[] iOutBuffer; |
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138 delete[] iInBuffer; |
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139 |
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140 iInBuffer = NULL; |
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141 iOutBuffer = NULL; |
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142 iInBufferCount = 0; |
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143 iOutBufferCount = 0; |
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144 iOutBufferPtr = NULL; |
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145 iOutFrameLength = KRawMp3MaxFrameSize; // since data is not decoded |
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146 iInBuffer = new (ELeave) TUint8[KSizeOfInBuffer]; |
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147 |
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148 iOutBuffer = new (ELeave) TUint8[iOutFrameLength]; |
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149 iOutBufferPtr = iOutBuffer; |
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150 |
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151 iAccLen = 0; |
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152 iEnabled = ETrue; |
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153 DP0(_L ("CMP3AudioPlayControllerDecoder::Reset - Exit")); |
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154 } |
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155 |
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156 TCodecProcessResult CMP3AudioPlayControllerDecoder::ProcessL(CMMFBuffer& aSrc, CMMFBuffer& aDst) |
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157 { |
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158 DP0(_L ("CMP3AudioPlayControllerDecoder::ProcessL")); |
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159 return CAdvancedAudioDecoder::ProcessHwL(aSrc, aDst); |
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160 } |
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161 |
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162 TInt CMP3AudioPlayControllerDecoder::FrameLength(const TUint8* aBuf, TInt aBufLen, TInt& aFrameLength) |
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163 { |
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164 TInt stat = KErrNone; |
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165 TAudioFrameInfo info; |
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166 TInt len = FrameInfo(aBuf, aBufLen, info); |
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167 if (len > 0) |
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168 { |
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169 aFrameLength = len; |
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170 } |
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171 else |
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172 { |
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173 stat = KErrUnknown; |
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174 } |
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175 return stat; |
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176 } |
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177 |
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178 // ----------------------------------------------------------------------------- |
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179 // CMP3AudioPlayControllerDecoder::FrameInfo |
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180 // ----------------------------------------------------------------------------- |
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181 // |
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182 TInt CMP3AudioPlayControllerDecoder::FrameInfo( |
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183 const TUint8* aBuf, |
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184 TInt aBufLen, |
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185 TAudioFrameInfo& aInfo) |
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186 { |
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187 TInt length = 0; |
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188 TUint temp; |
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189 TUint lTempVal; |
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190 |
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191 if (aBufLen >= KRawMp3FrameHeaderSize) |
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192 { |
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193 // Extract header fields to aInfo and check their bit syntax |
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194 // (including the sync word!). If the syntax is not OK the length |
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195 // is set to zero. |
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196 |
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197 temp = 0; |
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198 temp = aBuf[0] << 24; |
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199 temp |= (aBuf[1] << 16); |
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200 temp |= (aBuf[2] << 8); |
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201 temp |= aBuf[3]; |
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202 if (((temp >> 21) & 0x7FF) != 0x7FF) |
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203 { |
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204 return length; |
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205 } |
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206 |
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207 lTempVal = (temp >> 19) & 0x03; |
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208 switch (lTempVal) |
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209 { |
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210 case 0: |
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211 aInfo.iId = 2; // MPEG2.5 |
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212 aInfo.iFrameSamples = 576; |
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213 break; |
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214 case 1: |
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215 return length; |
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216 case 2: |
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217 aInfo.iId = 0; // MPEG 2 |
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218 aInfo.iFrameSamples = 576; |
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219 break; |
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220 case 3: |
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221 aInfo.iId = 1; // MPEG 1 |
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222 aInfo.iFrameSamples = 1152; |
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223 break; |
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224 } |
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225 |
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226 lTempVal = (temp >> 17) & 0x03; |
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227 if (lTempVal != 1) |
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228 { |
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229 return length; |
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230 } |
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231 |
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232 lTempVal = (temp >> 12) & 0x0F; |
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233 aInfo.iBitRate = cBitRateTable[aInfo.iId][lTempVal]*1000; |
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234 |
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235 if (aInfo.iBitRate == 0) |
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236 { |
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237 return length; |
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238 } |
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239 |
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240 lTempVal = (temp >> 10) & 0x03; |
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241 if (lTempVal == 3) |
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242 { |
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243 return length; |
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244 } |
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245 else |
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246 { |
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247 aInfo.iSamplingRate = cSamplingFrequencyTable[aInfo.iId][lTempVal]; |
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248 } |
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249 |
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250 aInfo.iPadding = (temp >> 9) & 0x01; |
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251 |
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252 lTempVal = (temp >> 6) & 0x03; |
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253 aInfo.iMode = lTempVal; |
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254 |
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255 if (lTempVal == 3) |
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256 { |
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257 aInfo.iChannels = 1; |
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258 } |
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259 else |
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260 { |
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261 aInfo.iChannels = 2; |
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262 } |
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263 |
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264 aInfo.iSamplingRateOut = aInfo.iSamplingRate; |
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265 aInfo.iChannelsOut = 2; /* always set to stereo output */ |
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266 aInfo.iFrameSamplesOut = aInfo.iFrameSamples; |
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267 |
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268 if (aInfo.iBitRate == -1) |
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269 { |
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270 // For free mode operation |
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271 length = KRawMp3MaxFrameSize; |
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272 } |
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273 |
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274 if (aInfo.iSamplingRate > 0 && aInfo.iBitRate > 0) |
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275 { |
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276 length = (144*aInfo.iBitRate)/aInfo.iSamplingRate; |
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277 |
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278 if (aInfo.iId != 1) |
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279 { |
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280 length >>= 1; /*for MPEG2 and MPEG2.5 */ |
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281 } |
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282 |
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283 if (aInfo.iPadding) |
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284 { |
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285 length++; |
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286 } |
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287 } |
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288 |
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289 aInfo.iFrameSize = length; |
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290 // iChannelsOut = aInfo.iChannelsOut; |
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291 } |
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292 return length; |
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293 } |
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294 |
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295 // ----------------------------------------------------------------------------- |
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296 // CMP3AudioPlayControllerDecoder::SeekSync |
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297 // ----------------------------------------------------------------------------- |
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298 TInt CMP3AudioPlayControllerDecoder::SeekSync(TUint8* aBuf, TInt aBufLen) |
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299 { |
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300 const TInt KMaxFrames = 3; // number of frames to check |
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301 const TInt KNotFound = aBufLen; // sync not found position |
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302 TAudioFrameInfo frameInfo; // frame parameters |
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303 TInt i = 0; |
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304 TInt syncPos = KNotFound; |
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305 TInt maxSeek = KMaxFrames; |
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306 const TUint8* endPtr = aBuf+aBufLen; |
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307 |
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308 // Seek a valid frame candidate byte by byte until a valid frame |
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309 // is found or all bytes have been checked. |
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310 while (aBuf < endPtr && syncPos == KNotFound) |
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311 { |
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312 TInt seekCount = 0; |
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313 const TUint8* framePtr = aBuf; |
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314 TInt frameBufLen = aBufLen; |
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315 syncPos = i; |
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316 |
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317 // Check the validity of this frame candidate and the nearest next |
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318 // frames. If they are not OK, syncPos will be set to KNotFound. |
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319 while (framePtr < endPtr && syncPos != KNotFound && seekCount < maxSeek) |
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320 { |
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321 TInt length = FrameInfo(framePtr, frameBufLen, frameInfo); |
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322 |
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323 if (length == 0) |
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324 { |
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325 syncPos = KNotFound; |
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326 } |
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327 if ((length > 0) && (frameInfo.iBitRate < 0)) |
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328 { |
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329 maxSeek = 1; // free formatcase |
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330 } |
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331 framePtr += length; |
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332 frameBufLen -= length; |
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333 seekCount++; |
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334 |
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335 // consider SYNC not found if we reach end of buffer before finding 3 SYNC frames |
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336 if ((framePtr >= endPtr) && (seekCount < maxSeek)) |
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337 { |
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338 syncPos = KNotFound; |
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339 aBuf += (aBufLen-1); // force an exit from while loop |
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340 } |
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341 } |
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342 aBuf++; aBufLen--; i++; |
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343 } |
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344 return syncPos; |
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345 } |
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346 |
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347 |
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348 // ----------------------------------------------------------------------------- |
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349 // CMP3AudioPlayControllerDecoder::IsHwAccelerated |
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350 // Always return true when no soft codec is used. |
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351 // ----------------------------------------------------------------------------- |
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352 // |
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353 TBool CMP3AudioPlayControllerDecoder::IsHwAccelerated() |
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354 { |
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355 return ETrue; |
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356 } |
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357 |
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358 TInt CMP3AudioPlayControllerDecoder::CodecCmd(TCodecCmd /*aCmd*/) |
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359 { |
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360 return KErrNotSupported; |
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361 } |
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362 |
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363 |
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364 // End of file |