sl@0: // Copyright (c) 2005-2009 Nokia Corporation and/or its subsidiary(-ies).
sl@0: // All rights reserved.
sl@0: // This component and the accompanying materials are made available
sl@0: // under the terms of "Eclipse Public License v1.0"
sl@0: // which accompanies this distribution, and is available
sl@0: // at the URL "http://www.eclipse.org/legal/epl-v10.html".
sl@0: //
sl@0: // Initial Contributors:
sl@0: // Nokia Corporation - initial contribution.
sl@0: //
sl@0: // Contributors:
sl@0: //
sl@0: // Description:
sl@0: //
sl@0: 
sl@0: #ifndef __BTSBCENCODER_H__
sl@0: #define __BTSBCENCODER_H__
sl@0: 
sl@0: #include <e32std.h>
sl@0: #include <mmf/server/mmfcodec.h>
sl@0: 
sl@0: #include "BtSBCFrameParameters.h"
sl@0: 
sl@0: const TUint8 KSbcMaxBlocks = 16;
sl@0: const TUint8 KSbcMaxChannels = 2;
sl@0: const TUint8 KSbcMaxSubbands = 8;
sl@0: 
sl@0: /**
sl@0: This class is for manipulating (reading/writing) raw bit stream. 
sl@0: It is used in sbc encoder for generating sbc frame bit stream.
sl@0: @internalComponent
sl@0: */
sl@0: class CBitStreamParser : public CBase
sl@0: 	{
sl@0: public:
sl@0: 	static CBitStreamParser* NewLC(TDes8& aBitStream);
sl@0: 	void 	Reset();
sl@0: 	
sl@0: 	/** relative position */
sl@0: 	TUint8	ReadBits(TInt aBitsToRead);
sl@0: 	void	WriteBits(TInt aBitsToWrite, TUint8 aBitsValue);
sl@0: 	
sl@0: 	inline TUint8	ReadByte();
sl@0: 	inline void		WriteByte(TUint8 aByteValue);
sl@0: 	
sl@0: 	/** absolute position */
sl@0: 	inline void		SetPosition(TUint aByteOffset, TUint8 aBitOffset);
sl@0: 	inline void		Position(TUint& aByteOffset, TUint8& aBitOffset) const;
sl@0: 
sl@0: private:
sl@0: 	CBitStreamParser(TDes8& aBitStream);
sl@0: 	~CBitStreamParser();
sl@0: 	
sl@0: 	void	ConstructL();
sl@0: 
sl@0: private:
sl@0: 	TDes8&  iBitStream;
sl@0: 	TUint8*	iPtr;
sl@0: 	TUint	iByteOffset;
sl@0: 	TUint8	iBitOffset;
sl@0: 	};
sl@0: 	
sl@0: /**
sl@0: This class is for checking and generating SBC CRC code. 
sl@0: It is used in sbc encoder for generating SBC CRC check number.
sl@0: @internalComponent
sl@0: */
sl@0: class CSbcCRCCalculator : public CBase
sl@0: 	{
sl@0: public:
sl@0: 	CSbcCRCCalculator();
sl@0: 	
sl@0: 	void 	Reset();
sl@0: 	void 	InputBit(TUint8 aBit);
sl@0: 	void	InputBits(TUint8 aBits, TUint8 aValue);
sl@0: 	void 	InputByte(TUint8 aByte);
sl@0: 	
sl@0: 	TUint8 	ShiftRegister();
sl@0: 	
sl@0: private:
sl@0: 	TUint8 	iShiftRegister;
sl@0: 	};
sl@0: 
sl@0: /**
sl@0: This class is for encoding one SBC frame
sl@0: @internalComponent
sl@0: */
sl@0: class CSBCFrameEncoder : public CBase
sl@0: 	{
sl@0: public:
sl@0: 	static CSBCFrameEncoder* NewL();
sl@0: 	~CSBCFrameEncoder();
sl@0: 	void EncodeFrameL(const TDesC8& aSrc, TDes8& aFrame);
sl@0: 	void Configure(const TSBCFrameParameters& aParameters);
sl@0: 	void Reset();
sl@0: 	
sl@0: private:
sl@0: 	CSBCFrameEncoder();
sl@0: 	void 	ConstructL();
sl@0: 	
sl@0: 	/** encode frame */
sl@0: 	void 	Analyse(const TDesC8& aSrc);
sl@0: 	void 	CalcScaleFactors();
sl@0: 	void	JoinSubbands();
sl@0: 	void 	CalcBitAllocation();
sl@0: 	void 	Quantize();
sl@0: 	
sl@0: 	void 	AnalyseMono(const TInt16 aInputSamples[]);
sl@0: 	void 	AnalyseOneChannel(const TInt16 aInputSamples[], TUint8 aChannel);
sl@0: 	void 	Analyse4Subbands(const TInt16 aInputSamples[], TUint8 aBlock, TUint8 aChannel);
sl@0: 	void 	Analyse8Subbands(const TInt16 aInputSamples[], TUint8 aBlock, TUint8 aChannel);
sl@0: 
sl@0: 	void	DoJoinSubbands();
sl@0: 	
sl@0: 	void 	CalcBitAllocIndependent();
sl@0: 	void 	CalcBitneedIndependent(TInt8 aBitneed[], const TUint8 aScaleFactors[]);
sl@0: 	TInt8 	MaxBitneedIndependent(const TInt8 aBitneed[]);
sl@0: 	TInt8 	CalcBitSlicesIndependent(const TInt8 aBitneed[], TInt& aBitCount);
sl@0: 	void 	DistributeBitsIndependent(const TInt8 aBitneed[], TUint8 aBits[]);
sl@0: 
sl@0: 	void 	CalcBitAllocCombined();
sl@0: 	void 	CalcBitneedCombined(TInt8 aBitneed[][KSbcMaxSubbands]);
sl@0: 	TInt8 	MaxBitneedCombined(const TInt8 aBitneed[][KSbcMaxSubbands]);
sl@0: 	TInt8 	CalcBitSlicesCombined(const TInt8 aBitneed[][KSbcMaxSubbands], TInt& aBitCount);
sl@0: 	void 	DistributeBitsCombined(const TInt8 aBitneed[][KSbcMaxSubbands]);
sl@0: 	
sl@0: 	TUint8 	CalcCRC();
sl@0: 	
sl@0: 	/** writing result back */
sl@0: 	void	WriteFrameL(TDes8& aFrame);
sl@0: 	void 	WriteHeader(CBitStreamParser& aParser);
sl@0: 	void 	WriteScaleFactors(CBitStreamParser& aParser);
sl@0: 	void 	WriteData(CBitStreamParser& aParser);
sl@0: 	void 	WritePaddingL(CBitStreamParser& aParser);
sl@0: 	
sl@0: private:
sl@0: 	/** input parameters, set before encode */
sl@0: 	TSBCFrameParameters	iParameters;
sl@0: 	
sl@0: 	TInt16 iAnalysisSamples[2][KSbcMaxSubbands * 10];
sl@0: 	TUint8 iScaleFactors[2][KSbcMaxSubbands];
sl@0: 	TUint8 iBits[2][KSbcMaxSubbands];
sl@0: 	TInt32 iOutputSamples[KSbcMaxBlocks][2][KSbcMaxSubbands];
sl@0: 	TUint8 iJoin[KSbcMaxSubbands];
sl@0: 	};
sl@0: 	
sl@0: /**
sl@0: This class is for encoding one SBC frame
sl@0: @internalComponent
sl@0: */
sl@0: class CSBCEncoder : public CMMFCodec
sl@0: 	{
sl@0: public:
sl@0: 	static CMMFCodec* NewL(TAny* aInitParams);
sl@0: 	virtual ~CSBCEncoder();
sl@0: 	void ConfigureL(TUid aConfigType, const TDesC8& aConfigData);
sl@0: 	TCodecProcessResult ProcessL(const CMMFBuffer& aSrc, CMMFBuffer& aDst);
sl@0: 
sl@0: private:
sl@0: 	CSBCEncoder();
sl@0: 	void 	ConstructL(TAny* aInitParams);
sl@0: 	void 	ResetL();
sl@0: 	
sl@0: 	TUint 	EncodeFrameL(const TDesC8& aSrc, TDes8& aDst);
sl@0: 	TUint 	CachePcmSamplesL(const CMMFDataBuffer& aSrc, TUint aSrcPos);
sl@0: 	TUint 	CachedSampleSize();
sl@0: 	
sl@0: private:
sl@0: 	/** input parameters, set before encode */
sl@0: 	TSBCFrameParameters	iParameters;
sl@0: 	TUint iPcmFrameSize;
sl@0: 	
sl@0: 	/** CSBCFrameEncoder encodes each frame */
sl@0: 	CSBCFrameEncoder*	iSbcFrameEncoder;
sl@0: 	TUint iSbcFrameLength;
sl@0: 	
sl@0: 	/** pcm audio sample cach */
sl@0: 	HBufC8* iPcmSampleCach;
sl@0: 	};
sl@0: 	
sl@0: #endif // __BTSBCENCODER_H__
sl@0: