mmfenh/advancedaudiocontroller/audiocontrollerpluginsvariant/aacaudioplaycontroller/Src/AACAudioPlayControllerRecognizer.cpp
author hgs
Fri, 14 May 2010 18:19:45 -0500
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permissions -rw-r--r--
201019
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/*
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* Copyright (c) 2004 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:  Recognizer for AAC files.
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*
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*/
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// INCLUDES
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#include	<f32file.h>
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#include	<barsread.h>
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#include	<implementationproxy.h>
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#include	"AACAudioPlayControllerRecognizer.h"
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// LOCAL CONSTANTS AND MACROS
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const TUid KUidMimeAacRecognizer = {0x101FAF96};
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const TInt KExtLength = 4;
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_LIT(KDotAac, ".aac");
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_LIT8(KAacMimeType, "audio/aac");
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// ============================ MEMBER FUNCTIONS ===============================
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// -----------------------------------------------------------------------------
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// CAACAudioPlayControllerRecognizer::CAACAudioPlayControllerRecognizer()
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// C++ default constructor can NOT contain any code, that
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// might leave.
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// Call base constructor with the recognizer's UID and confidence level
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// -----------------------------------------------------------------------------
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//
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CAACAudioPlayControllerRecognizer::CAACAudioPlayControllerRecognizer()
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	:	CApaDataRecognizerType(KUidMimeAacRecognizer, CApaDataRecognizerType::EHigh)
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	{
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	// Set the number of data (MIME) types supported by this recognizer.
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	iCountDataTypes = 1;
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	}
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// -----------------------------------------------------------------------------
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// CAACAudioPlayControllerRecognizer::ConstructL()
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// Symbian 2nd phase constructor can leave.
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// -----------------------------------------------------------------------------
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//
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void CAACAudioPlayControllerRecognizer::ConstructL()
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	{
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	}
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// -----------------------------------------------------------------------------
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// CAACAudioPlayControllerRecognizer::NewL()
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// Two-phased constructor.
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// -----------------------------------------------------------------------------
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//
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CAACAudioPlayControllerRecognizer* CAACAudioPlayControllerRecognizer::NewL()
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	{
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#ifdef _DEBUG
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	RDebug::Print(_L("CAACAudioPlayControllerRecognizer::NewL"));
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#endif
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	CAACAudioPlayControllerRecognizer* self = new (ELeave) CAACAudioPlayControllerRecognizer();
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	CleanupStack::PushL(self);
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	self->ConstructL();
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	CleanupStack::Pop(self);
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	return self;
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	}
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// Destructor
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CAACAudioPlayControllerRecognizer::~CAACAudioPlayControllerRecognizer()
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	{
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	}
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// -----------------------------------------------------------------------------
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// CAACAudioPlayControllerRecognizer::SupportedDataTypeL
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// Return the MimeType of the DataType depending on
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// mime type of the file
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// -----------------------------------------------------------------------------
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//
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TDataType CAACAudioPlayControllerRecognizer::SupportedDataTypeL(
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	TInt aIndex ) const
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	{
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#ifdef _DEBUG
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	RDebug::Print(_L("CAACAudioPlayControllerRecognizer::SupportedDataTypeL [%d]"), aIndex);
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#endif
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	TDataType dataType;
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	switch ( aIndex )
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		{
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		case 0:
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			dataType = TDataType(KAacMimeType);
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			break;
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		default:
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			User::Leave(KErrArgument);
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			break;
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		}
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	return dataType;
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	}
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// -----------------------------------------------------------------------------
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// CAACAudioPlayControllerRecognizer::PreferredBufSize()
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// Return the supposed minimum buffer size we need to
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// successfully recognize the data
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// -----------------------------------------------------------------------------
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//
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TUint CAACAudioPlayControllerRecognizer::PreferredBufSize()
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	{
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	return 0;
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	}
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// -----------------------------------------------------------------------------
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// CAACAudioPlayControllerRecognizer::DoRecognizeL
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// Attempt to recognize the data
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// this recognizer only attempts to match the data and/or file suffix
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//
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// NB if the file is not recognized, this function should NOT leave :
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// it should instead set iConfidence = ENotRecognized and return
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// the function should only leave if there is an out-of-memory condition
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// -----------------------------------------------------------------------------
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//
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void CAACAudioPlayControllerRecognizer::DoRecognizeL(
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	const TDesC& aName,
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	const TDesC8& /*aBuffer*/ )
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	{
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#ifdef _DEBUG
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	RDebug::Print(_L("CAACAudioPlayControllerRecognizer::DoRecognizeL: "));
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	RDebug::RawPrint(aName);
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	RDebug::Print(_L(" "));
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#endif
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	// assume match will fail
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	iConfidence = CApaDataRecognizerType::ENotRecognized;
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	if ( aName.Length() < KExtLength )
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		{
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#ifdef _DEBUG
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	RDebug::Print(_L("CAACAudioPlayControllerRecognizer::DoRecognizeL - Ext not present"));
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#endif
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		return;
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		}
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	if ( aName.Right( KDotAac.iTypeLength ).CompareF(KDotAac) == 0 )
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		{
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#ifdef _DEBUG
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	RDebug::Print(_L("CAACAudioPlayControllerRecognizer::DoRecognizeL - Possible match!"));
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#endif
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		iDataType = TDataType(KAacMimeType);
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		iConfidence = EProbable;
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		}
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  	}
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// ========================== OTHER EXPORTED FUNCTIONS =========================
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// -----------------------------------------------------------------------------
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// CApaDataRecognizerType* CreateRecognizerL()
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// Used to create an instance of a CApaDataRecognizerType-derived class
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// -----------------------------------------------------------------------------
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//
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CApaDataRecognizerType* CAACAudioPlayControllerRecognizer::CreateRecognizerL()
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	{
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	return new (ELeave) CAACAudioPlayControllerRecognizer ();
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	}
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const TImplementationProxy ImplementationTable[] =
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	{
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		IMPLEMENTATION_PROXY_ENTRY(0x101FAFD7, CAACAudioPlayControllerRecognizer::CreateRecognizerL)
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	};
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EXPORT_C const TImplementationProxy* ImplementationGroupProxy(TInt& aTableCount)
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    {
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    aTableCount = sizeof(ImplementationTable) / sizeof(TImplementationProxy);
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    return ImplementationTable;
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    }
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// End of file