author | Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com> |
Thu, 02 Sep 2010 20:13:57 +0300 | |
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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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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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