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1 // Copyright (c) 2004-2009 Nokia Corporation and/or its subsidiary(-ies). |
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2 // All rights reserved. |
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3 // This component and the accompanying materials are made available |
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4 // under the terms of "Eclipse Public License v1.0" |
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5 // which accompanies this distribution, and is available |
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6 // at the URL "http://www.eclipse.org/legal/epl-v10.html". |
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7 // |
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8 // Initial Contributors: |
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9 // Nokia Corporation - initial contribution. |
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10 // |
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11 // Contributors: |
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12 // |
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13 // Description: |
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14 // |
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15 |
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16 #ifndef __SBCENCODER_H__ |
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17 #define __SBCENCODER_H__ |
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18 |
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19 #include <e32std.h> |
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20 #include <mmf/server/mmfcodec.h> |
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21 |
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22 #include "SBCFrameParameters.h" |
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23 |
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24 const TUint8 KSbcMaxBlocks = 16; |
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25 const TUint8 KSbcMaxChannels = 2; |
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26 const TUint8 KSbcMaxSubbands = 8; |
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27 |
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28 /** |
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29 This class is for manipulating (reading/writing) raw bit stream. |
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30 It is used in sbc encoder for generating sbc frame bit stream. |
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31 @internalComponent |
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32 */ |
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33 class CBitStreamParser : public CBase |
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34 { |
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35 public: |
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36 static CBitStreamParser* NewLC(TDes8& aBitStream); |
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37 void Reset(); |
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38 |
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39 /** relative position */ |
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40 TUint8 ReadBits(TInt aBitsToRead); |
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41 void WriteBits(TInt aBitsToWrite, TUint8 aBitsValue); |
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42 |
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43 inline TUint8 ReadByte(); |
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44 inline void WriteByte(TUint8 aByteValue); |
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45 |
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46 /** absolute position */ |
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47 inline void SetPosition(TUint aByteOffset, TUint8 aBitOffset); |
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48 inline void Position(TUint& aByteOffset, TUint8& aBitOffset) const; |
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49 |
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50 private: |
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51 CBitStreamParser(TDes8& aBitStream); |
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52 ~CBitStreamParser(); |
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53 |
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54 void ConstructL(); |
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55 |
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56 private: |
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57 TDes8& iBitStream; |
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58 TUint8* iPtr; |
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59 TUint iByteOffset; |
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60 TUint8 iBitOffset; |
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61 }; |
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62 |
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63 /** |
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64 This class is for checking and generating SBC CRC code. |
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65 It is used in sbc encoder for generating SBC CRC check number. |
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66 @internalComponent |
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67 */ |
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68 class CSbcCRCCalculator : public CBase |
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69 { |
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70 public: |
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71 CSbcCRCCalculator(); |
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72 |
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73 void Reset(); |
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74 void InputBit(TUint8 aBit); |
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75 void InputBits(TUint8 aBits, TUint8 aValue); |
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76 void InputByte(TUint8 aByte); |
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77 |
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78 TUint8 ShiftRegister(); |
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79 |
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80 private: |
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81 TUint8 iShiftRegister; |
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82 }; |
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83 |
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84 /** |
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85 This class is for encoding one SBC frame |
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86 @internalComponent |
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87 */ |
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88 class CSBCFrameEncoder : public CBase |
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89 { |
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90 public: |
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91 static CSBCFrameEncoder* NewL(); |
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92 ~CSBCFrameEncoder(); |
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93 void EncodeFrameL(const TDesC8& aSrc, TDes8& aFrame); |
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94 void Configure(const TSBCFrameParameters& aParameters); |
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95 void Reset(); |
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96 |
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97 private: |
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98 CSBCFrameEncoder(); |
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99 void ConstructL(); |
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100 |
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101 /** encode frame */ |
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102 void Analyse(const TDesC8& aSrc); |
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103 void CalcScaleFactors(); |
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104 void JoinSubbands(); |
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105 void CalcBitAllocation(); |
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106 void Quantize(); |
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107 |
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108 void AnalyseMono(const TInt16 aInputSamples[]); |
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109 void AnalyseOneChannel(const TInt16 aInputSamples[], TUint8 aChannel); |
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110 void Analyse4Subbands(const TInt16 aInputSamples[], TUint8 aBlock, TUint8 aChannel); |
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111 void Analyse8Subbands(const TInt16 aInputSamples[], TUint8 aBlock, TUint8 aChannel); |
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112 |
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113 void DoJoinSubbands(); |
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114 |
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115 void CalcBitAllocIndependent(); |
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116 void CalcBitneedIndependent(TInt8 aBitneed[], const TUint8 aScaleFactors[]); |
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117 TInt8 MaxBitneedIndependent(const TInt8 aBitneed[]); |
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118 TInt8 CalcBitSlicesIndependent(const TInt8 aBitneed[], TInt& aBitCount); |
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119 void DistributeBitsIndependent(const TInt8 aBitneed[], TUint8 aBits[]); |
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120 |
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121 void CalcBitAllocCombined(); |
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122 void CalcBitneedCombined(TInt8 aBitneed[][KSbcMaxSubbands]); |
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123 TInt8 MaxBitneedCombined(const TInt8 aBitneed[][KSbcMaxSubbands]); |
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124 TInt8 CalcBitSlicesCombined(const TInt8 aBitneed[][KSbcMaxSubbands], TInt& aBitCount); |
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125 void DistributeBitsCombined(const TInt8 aBitneed[][KSbcMaxSubbands]); |
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126 |
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127 TUint8 CalcCRC(); |
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128 |
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129 /** writing result back */ |
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130 void WriteFrameL(TDes8& aFrame); |
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131 void WriteHeader(CBitStreamParser& aParser); |
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132 void WriteScaleFactors(CBitStreamParser& aParser); |
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133 void WriteData(CBitStreamParser& aParser); |
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134 void WritePaddingL(CBitStreamParser& aParser); |
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135 |
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136 private: |
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137 /** input parameters, set before encode */ |
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138 TSBCFrameParameters iParameters; |
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139 |
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140 TInt16 iAnalysisSamples[2][KSbcMaxSubbands * 10]; |
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141 TUint8 iScaleFactors[2][KSbcMaxSubbands]; |
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142 TUint8 iBits[2][KSbcMaxSubbands]; |
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143 TInt32 iOutputSamples[KSbcMaxBlocks][2][KSbcMaxSubbands]; |
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144 TUint8 iJoin[KSbcMaxSubbands]; |
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145 }; |
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146 |
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147 /** |
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148 This class is for encoding one SBC frame |
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149 @internalComponent |
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150 */ |
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151 class CSBCEncoder : public CMMFCodec |
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152 { |
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153 public: |
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154 static CMMFCodec* NewL(TAny* aInitParams); |
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155 virtual ~CSBCEncoder(); |
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156 void ConfigureL(TUid aConfigType, const TDesC8& aConfigData); |
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157 TCodecProcessResult ProcessL(const CMMFBuffer& aSrc, CMMFBuffer& aDst); |
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158 |
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159 private: |
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160 CSBCEncoder(); |
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161 void ConstructL(TAny* aInitParams); |
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162 void ResetL(); |
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163 |
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164 TUint EncodeFrameL(const TDesC8& aSrc, TDes8& aDst); |
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165 TUint CachePcmSamplesL(const CMMFDataBuffer& aSrc, TUint aSrcPos); |
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166 TUint CachedSampleSize(); |
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167 |
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168 private: |
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169 /** input parameters, set before encode */ |
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170 TSBCFrameParameters iParameters; |
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171 TUint iPcmFrameSize; |
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172 |
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173 /** CSBCFrameEncoder encodes each frame */ |
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174 CSBCFrameEncoder* iSbcFrameEncoder; |
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175 TUint iSbcFrameLength; |
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176 |
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177 /** pcm audio sample cach */ |
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178 HBufC8* iPcmSampleCach; |
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179 }; |
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180 |
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181 #endif // __SBCENCODER_H__ |
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182 |