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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\utils\rateconvert.h
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//
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//
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#ifndef RATECONVERT_H
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#define RATECONVERT_H
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/**
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@internalTechnology
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@file
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*/
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#include <e32base.h>
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/**
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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 CChannelAndSampleRateConverter : public CBase
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{
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protected:
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CChannelAndSampleRateConverter();
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public:
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/*
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Create a converter that will do rate and channel conversion as requested
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*/
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IMPORT_C static CChannelAndSampleRateConverter* CreateL(TInt aFromRate,TInt aFromChannels,
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TInt aToRate,TInt aToChannels);
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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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The source buffer containing the audio data to convert.
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@param aDstBuffer
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The destination buffer - assumed big enough
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@return The length of the source buffer that was consumed.
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*/
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virtual TInt Convert(const TDesC8& aSrcBuffer, TDes8& aDstBuffer)=0;
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virtual void Reset()=0;
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/*
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Indicates what buffer size is required to hold the converted data.
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Support size of original buffer.
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aRoundUpToPower means give next power of 2 size up from raw size.
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NB. May be bigger than strictly necessary.
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*/
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virtual TInt MaxConvertBufferSize(TInt aSrcBufferSize, TBool aRoundUpToPower=EFalse)=0;
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};
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#endif
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