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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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//
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#ifndef RATECONVERTIMPL_H
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#define RATECONVERTIMPL_H
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#include "mmf/utils/rateconvert.h"
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/**
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Abstract class that all specific converters derive from.
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*/
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NONSHARABLE_CLASS( CChannelAndSampleRateConverterCommon ) : public CChannelAndSampleRateConverter
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{
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public:
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virtual void SetRates(TInt aSrcRate,TInt aDstRate);
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// from CChannelAndSampleRateConverter
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void Reset();
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TInt MaxConvertBufferSize(TInt aSrcBufferSize, TBool aRoundUpToPower);
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protected:
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CChannelAndSampleRateConverterCommon();
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static TInt NextPowerUp(TInt aValue);
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inline static TInt StereoToMono(TInt aSample);
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inline static TInt MonoToStereo(TInt aSample);
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inline static TInt LengthBytesTo16Bit(TInt aLength);
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inline static TInt LengthBytesTo32Bit(TInt aLength);
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inline static TInt Length16BitToBytes(TInt aLength);
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inline static TInt Length32BitToBytes(TInt aLength);
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};
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/* functions for copying from mono to stereo and from stereo to mono */
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inline TInt CChannelAndSampleRateConverterCommon::StereoToMono(TInt aSample)
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{
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TInt topChannel = aSample>>16; // will naturally keep sign
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TInt bottomChannel = TInt16(aSample&0xffff); // need to sign extend
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TInt monoSample = (topChannel + bottomChannel)/2; // add two channels and divide
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return monoSample;
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}
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inline TInt CChannelAndSampleRateConverterCommon::MonoToStereo(TInt aSample)
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{
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TInt32 stereoSample = (aSample<<16) | (aSample&0xffff);
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#ifdef _DEBUG
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TInt monoSample = StereoToMono(stereoSample);
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ASSERT(monoSample==aSample);
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#endif
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return TInt(stereoSample);
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}
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// Convert various lengths by multipling or dividing by 2 or 4
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inline TInt CChannelAndSampleRateConverterCommon::LengthBytesTo16Bit(TInt aLength)
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{
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return aLength/sizeof(TInt16);
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}
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inline TInt CChannelAndSampleRateConverterCommon::LengthBytesTo32Bit(TInt aLength)
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{
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return aLength/sizeof(TInt32);
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}
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inline TInt CChannelAndSampleRateConverterCommon::Length16BitToBytes(TInt aLength)
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{
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return aLength*sizeof(TInt16);
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}
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inline TInt CChannelAndSampleRateConverterCommon::Length32BitToBytes(TInt aLength)
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{
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return aLength*sizeof(TInt32);
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}
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/**
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Abstract class that all specific rate converters derive from - as opposed to channel converters
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*/
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NONSHARABLE_CLASS( CChannelAndSampleRateConvert ) : public CChannelAndSampleRateConverterCommon
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{
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public:
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// from CChannelAndSampleRateConverterCommon
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void Reset();
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TInt MaxConvertBufferSize(TInt aSrcBufferSize, TBool aRoundUpToPower);
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void SetRates(TInt aSrcRate,TInt aDstRate);
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protected:
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CChannelAndSampleRateConvert();
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TInt SizeOfUpsampleBuffer(TInt aBufferLength);
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protected:
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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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TInt iFraction;
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TInt iIndex;
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};
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NONSHARABLE_CLASS( CStereoToMonoRateConverter ) : public CChannelAndSampleRateConvert
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{
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public:
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CStereoToMonoRateConverter();
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protected:
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// from CChannelAndSampleRateConvert
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TInt Convert(const TDesC8& aSrcBuffer, TDes8& aDstBuffer);
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TInt MaxConvertBufferSize(TInt aSrcBufferSize, TBool aRoundUpToPower);
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};
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NONSHARABLE_CLASS( CStereoToMonoConverter ) : public CChannelAndSampleRateConverterCommon
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{
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public:
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CStereoToMonoConverter();
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protected:
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// from CChannelAndSampleRateConverterCommon
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TInt Convert(const TDesC8& aSrcBuffer, TDes8& aDstBuffer);
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TInt MaxConvertBufferSize(TInt aSrcBufferSize, TBool aRoundUpToPower);
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};
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NONSHARABLE_CLASS( CStereoToStereoRateConverter ) : public CChannelAndSampleRateConvert
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{
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public:
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CStereoToStereoRateConverter();
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protected:
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// from CChannelAndSampleRateConvert
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TInt Convert(const TDesC8& aSrcBuffer, TDes8& aDstBuffer);
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};
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NONSHARABLE_CLASS( CMonoToMonoRateConverter ) : public CChannelAndSampleRateConvert
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{
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public:
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CMonoToMonoRateConverter();
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protected:
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// from CChannelAndSampleRateConvert
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TInt Convert(const TDesC8& aSrcBuffer, TDes8& aDstBuffer);
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};
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NONSHARABLE_CLASS( CMonoToStereoConverter ) : public CChannelAndSampleRateConverterCommon
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{
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public:
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CMonoToStereoConverter();
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protected:
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// from CChannelAndSampleRateConverterCommon
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TInt Convert(const TDesC8& aSrcBuffer, TDes8& aDstBuffer);
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TInt MaxConvertBufferSize(TInt aSrcBufferSize, TBool aRoundUpToPower);
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};
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NONSHARABLE_CLASS( CMonoToStereoRateConverter ) : public CChannelAndSampleRateConvert
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{
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public:
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CMonoToStereoRateConverter();
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protected:
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// from CChannelAndSampleRateConvert
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TInt Convert(const TDesC8& aSrcBuffer, TDes8& aDstBuffer);
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TInt MaxConvertBufferSize(TInt aSrcBufferSize, TBool aRoundUpToPower);
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};
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#endif
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