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// Copyright (c) 1997-2009 Nokia Corporation and/or its subsidiary(-ies).
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// All rights reserved.
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// This component and the accompanying materials are made available
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// under the terms of "Eclipse Public License v1.0"
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// which accompanies this distribution, and is available
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// at the URL "http://www.eclipse.org/legal/epl-v10.html".
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//
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// Initial Contributors:
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// Nokia Corporation - initial contribution.
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//
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// Contributors:
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//
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// Description:
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//
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#ifndef __TONEGENERATOR_H__
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#define __TONEGENERATOR_H__
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#include <e32base.h>
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//
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// Sine tone generator
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//
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const TInt KMaxSineTable = 256;
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const TUint KToneBufferSize = 8192;
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// one second in microseconds
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const TInt KOneMillionMicroSeconds = 1000000;
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class TSineGen
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/**
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*@internalTechnology
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*/
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{
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public:
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void SetFrequency(TInt aFrequency,TInt aAmplitude);
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TInt NextSample();
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private:
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TUint iPosition;
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TUint iStep;
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TInt iAmplitude;
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static const TInt16 SineTable[KMaxSineTable];
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static const TInt16 IncTable[KMaxSineTable];
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};
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class TSineWave
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/**
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*@internalTechnology
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*/
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{
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public:
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void Generate(TInt16* aDest,TInt aCount);
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void SetFrequency(TInt aFrequency,TInt aAmplitude);
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void SetFrequency(TInt aFrequency1,TInt aAmplitude1,TInt aFrequency2,TInt aAmplitude2);
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private:
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TSineGen iGen1;
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TSineGen iGen2;
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};
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//
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// Tone synthesis interface
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// Defines the abstract interface for tone synthesis
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// Capable of filling buffers with audio data
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//
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class MMdaToneSynthesis
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/**
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*@internalTechnology
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*/
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{
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public:
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// Allocate necessary resources for this kind of synthesis
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virtual void Configure(TInt aRate, TInt aChannels, TInt aRepeats, TInt aSilence, TInt aRampUp)=0;
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// Begin generating data from start again
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virtual void Reset()=0;
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// Fill supplied buffer with next block of 16bit PCM audio data
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virtual TInt FillBuffer(TDes8& aBuffer)=0;
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};
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//
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// Tone generator base class
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//
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class TMdaToneGenerator : public MMdaToneSynthesis
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{
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public:
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virtual void Configure(TInt aRate, TInt aChannels, TInt aRepeats, TInt aSilence, TInt aRampUp);
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virtual TInt FillBuffer(TDes8& aBuffer);
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protected:
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virtual TInt GetNextTone()=0;
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//
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TInt DurationToSamples(const TTimeIntervalMicroSeconds& aDuration);
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protected:
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TSineWave iSineWave;
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TInt iRate;
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TInt iChannels;
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TInt iSamplesLeft;
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TInt iTrailingSilence;
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TBool iRampUp;
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TBool iRampDown;
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TBool iIncompleteRampDown;
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TBool iIncompleteRampUp;
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TInt iIncompleteVolume;
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TInt iRampUpRemainder;
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TInt iRepeats;
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TInt iSilenceBetweenRepeats;
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TBool iAfterRepeatSilence;
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TInt iRampUpCount;
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TInt iRampUpLeft;
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};
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//
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// Simple tone synthesis
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//
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class TMdaSimpleToneGenerator : public TMdaToneGenerator
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/**
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*@internalTechnology
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*/
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{
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public:
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void SetFrequencyAndDuration(TInt aFrequency, const TTimeIntervalMicroSeconds& aDuration);
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virtual void Reset();
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virtual TInt GetNextTone();
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private:
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TTimeIntervalMicroSeconds iDuration;
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TInt iFrequency;
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TBool iPlayed;
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};
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/**
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* Dual tone synthesis
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* Generates a tone consisting of two sine waves of different
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* frequencies summed together.
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*
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* @internalTechnology
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*/
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class TMdaDualToneGenerator : public TMdaToneGenerator
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{
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public:
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void SetFrequencyAndDuration(TInt aFrequencyOne, TInt aFrequencyTwo, const TTimeIntervalMicroSeconds& aDuration);
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virtual void Reset();
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virtual TInt GetNextTone();
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private:
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TTimeIntervalMicroSeconds iDuration;
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TInt iFrequencyOne;
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TInt iFrequencyTwo;
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TBool iPlayed;
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};
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//
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// DTMF tone synthesis
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//
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class TMdaDTMFGenerator : public TMdaToneGenerator
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/**
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*@internalTechnology
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*/
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{
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public:
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virtual void Reset();
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void SetToneDurations( const TTimeIntervalMicroSeconds32 aOn,
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const TTimeIntervalMicroSeconds32 aOff,
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const TTimeIntervalMicroSeconds32 aPause);
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void SetString(const TDesC& aDTMFString);
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private:
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virtual TInt GetNextTone();
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private:
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const TDesC* iDTMFString;
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TTimeIntervalMicroSeconds32 iOn;
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TTimeIntervalMicroSeconds32 iOff;
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TTimeIntervalMicroSeconds32 iPause;
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TInt iOnSamples;
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TInt iOffSamples;
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TInt iPauseSamples;
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TInt iChar;
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TBool iPlayToneOff;
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};
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//
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// Tone sequence synthesis
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//
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const TInt KMaxSequenceStack = 6;
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class TMdaSequenceGenerator : public TMdaToneGenerator
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/**
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*@internalTechnology
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*/
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{
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public:
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virtual void Reset();
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void SetSequenceData(const TDesC8& aSequenceData);
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private:
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virtual TInt GetNextTone();
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private:
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const TDesC8* iSequenceData;
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const TInt16* iInstructionPtr;
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const TInt16* iLastInstruction;
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TInt iStack[KMaxSequenceStack];
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TInt iStackIndex;
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};
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const TInt KBufferLength = 0x1000;
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// Public Media Server includes
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class TMdaPtr8 : public TPtr8 //needed for this WINS Impl of Tone Gen
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{
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public:
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TMdaPtr8()
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: TPtr8(0,0,0) {};
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inline void Set(const TDes8& aDes)
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{ TPtr8::Set((TUint8*)(aDes.Ptr()),aDes.Length(),aDes.MaxLength()); };
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inline void SetLengthOnly(const TDes8& aDes)
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{ TPtr8::Set((TUint8*)(aDes.Ptr()),aDes.Length(),aDes.Length()); };
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inline void Set(const TPtrC8& aDes)
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{ TPtr8::Set((TUint8*)(aDes.Ptr()),aDes.Length(),aDes.Length()); };
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inline void Shift(TInt aOffset)
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{ SetLength(Length()-aOffset); iMaxLength-=aOffset; iPtr+=aOffset; };
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};
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#endif
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