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// Copyright (c) 2002-2009 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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// include\mmf\common\mmfutilities.h
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//
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//
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#ifndef __MMF_COMMON_HELPER_H__
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#define __MMF_COMMON_HELPER_H__
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#include <e32base.h>
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#include <mmf/server/mmfdatabuffer.h>
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#include <mmf/common/mmffourcc.h>
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/**
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@internalAll
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Base utility class to change the sample rate of audio data in a buffer
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*/
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class CMMFChannelAndSampleRateConverter : public CBase
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{
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public:
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/**
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Reads the audio data from the source buffer,
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converts the number of channels and the sample rate
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and copies the result to the destination buffer
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@param aSrcBuffer
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A pointer to a source buffer containing the audio data to convert.
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@param aDstBuffer
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A pointer to a destination buffer.
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@return The length of the destination buffer.
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*/
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virtual TInt Convert(const CMMFDataBuffer& aSrcBuffer, CMMFDataBuffer& aDstBuffer) =0;
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virtual void Reset() {};
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/*
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Indicates what buffer size is required to hold the converted data.
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*/
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virtual TUint MaxConvertBufferSize(TUint aSrcBufferSize) {return aSrcBufferSize;}
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void SetRates(TInt aSrcRate,TInt aSrcChannels,TInt aDstRate,TInt aDstChannels);
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public:
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/*
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The sample rate of the data in the source buffer
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*/
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TInt iFromRate;
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/*
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The sample rate of the data in the destination buffer
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*/
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TInt iToRate;
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/*
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The number of channels of data in the source buffer
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*/
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TInt iFromChannels;
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/*
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The number of channels of data in the destination buffer
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*/
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TInt iToChannels;
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protected:
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TReal iRatio;
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TInt iFraction;
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TInt iIndex;
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};
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/**
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@internalAll
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*/
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class CMMFStereoToMonoRateConverter : public CMMFChannelAndSampleRateConverter
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{
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public:
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virtual TInt Convert(const CMMFDataBuffer& aSrcBuffer, CMMFDataBuffer& aDstBuffer);
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virtual TUint MaxConvertBufferSize(TUint aSrcBufferSize);
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};
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/**
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@internalAll
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*/
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class CMMFStereoToMonoConverter : public CMMFChannelAndSampleRateConverter
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{
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public:
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virtual TInt Convert(const CMMFDataBuffer& aSrcBuffer, CMMFDataBuffer& aDstBuffer);
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virtual TUint MaxConvertBufferSize(TUint aSrcBufferSize);
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};
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/**
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@internalAll
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*/
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class CMMFStereoToStereoRateConverter : public CMMFChannelAndSampleRateConverter
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{
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public:
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virtual TInt Convert(const CMMFDataBuffer& aSrcBuffer, CMMFDataBuffer& aDstBuffer);
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};
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/**
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@internalAll
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*/
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class CMMFMonoToMonoRateConverter : public CMMFChannelAndSampleRateConverter
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{
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public:
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virtual TInt Convert(const CMMFDataBuffer& aSrcBuffer, CMMFDataBuffer& aDstBuffer);
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};
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/**
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@internalAll
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*/
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class CMMFMonoToStereoConverter : public CMMFChannelAndSampleRateConverter
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{
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public:
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virtual TInt Convert(const CMMFDataBuffer& aSrcBuffer, CMMFDataBuffer& aDstBuffer);
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virtual TUint MaxConvertBufferSize(TUint aSrcBufferSize);
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};
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/**
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@internalAll
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*/
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class CMMFMonoToStereoRateConverter : public CMMFChannelAndSampleRateConverter
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{
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public:
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virtual TInt Convert(const CMMFDataBuffer& aSrcBuffer, CMMFDataBuffer& aDstBuffer);
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virtual TUint MaxConvertBufferSize(TUint aSrcBufferSize);
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};
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/**
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@internalAll
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Factory class to create the appropriate CMMFChannelAndSampleRateConverter-derived
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class depending on the supplied number of channels and bit rate
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*/
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class CMMFChannelAndSampleRateConverterFactory : public CBase
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{
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public:
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IMPORT_C CMMFChannelAndSampleRateConverter* CreateConverterL(TInt aFromRate,TInt aFromChannels,
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TInt aToRate,TInt aToChannels);
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IMPORT_C CMMFChannelAndSampleRateConverter* CreateConverterL();
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CMMFChannelAndSampleRateConverter* Converter() {return iConverter;}
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IMPORT_C ~CMMFChannelAndSampleRateConverterFactory();
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TInt Rate() {return iToRate;}
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TInt Channels() {return iToChannels;}
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public:
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/**
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The sample rate of the data in the source buffer
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*/
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TInt iFromRate;
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/**
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The sample rate of the data in the destination buffer
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*/
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TInt iToRate;
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/**
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The number of channels of data in the source buffer
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*/
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TInt iFromChannels;
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/**
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The number of channels of data in the destination buffer
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*/
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TInt iToChannels;
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private:
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CMMFChannelAndSampleRateConverter* iConverter;
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};
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#endif //__MMF_COMMON_HELPER_H__
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