inc/AudioConfigurationPrivateCRKeys.h
author Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
Tue, 06 Jul 2010 14:50:35 +0300
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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:  Audio Configuration internal Central Repository keys for
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*                specifying buffering mode during progressive download.
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*
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*/
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#ifndef AUDIOCONFIGURATIONINTERNALCRKEYS_H
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#define AUDIOCONFIGURATIONINTERNALCRKEYS_H
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// INCLUDES
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#include <e32def.h>
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// CONSTANTS
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/**
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* Audio Configuration CR UID.
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*/
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const TUid KCRUidAudioConfiguration = {0x10207B74};
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/**
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* This key is required for the Enhanced Media Client to determine the "buffering mode"
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* when the source runs out of data. When it happens, the source will start sending
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* buffer to underlying framework when buffering condition is met.
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*
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* Possible integer values:
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* 0 = "None". No buffering is done, as and when data is downloaded, it will be given
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*     to underlying framework.
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* 1 = "Fixed Size". Fixed size buffering. The source waits until the data accumulated
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*     reaches the limit (in bytes) specified by KPDLPrimaryBufferingAmount.
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* 2 = "Fixed duration". Fixed duration buffering. The source waits until the data
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*     accumulated reaches the limit (calculated dynamically). When playback begins,
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*     it is guarenteed to continue playback for KPDLPrimaryBufferingAmount duration
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*     before it may underflow again. (Note: The playback may stop due to other reasons
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*     but insufficient data).
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* 3 = "Dynamic duration". Dynamic duration buffering. The source waits until the data
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*     accumulated reaches the limit (in bytes) specified by KPDLPrimaryBufferingAmount
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*     plus a constant. The limit determined is the best possible approximation.
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*     When the playback begins it is may never underflow until the clip is played
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*     back completely. This assuming that data transfer rate and the bit rate of the
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*     clip remains constant until the download is complete.
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      (Note: The playback may stop due to other reasons but insufficient data).
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*/
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const TUint32 KPDLPrimaryBufferingType  = 0x00000001;
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/**
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* Size/Duration value associated with primary buffering type.
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*/
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const TUint32 KPDLPrimaryBufferingAmount = 0x00000002;
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/**
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* This key is used if primary configuration cannot be used.
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* This may happen when the component does not know all the variables needed to
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* to determine the buffering limit.
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*
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* If the buffering type specified is still invalid at runtime(for e.g. the customer may have
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* configured both primary and secondary to fixed duration and the bit rate may
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* not be known in the begining of playback). The component will default to no
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* buffering and will send data to framework as and when it is received. The playback
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* may include breaks in this case. To avoid this, this should be configured to fixed
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* size. 
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*/
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const TUint32 KPDLSecondaryBufferingType = 0x00000003;
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/**
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* Size/Duration value associated with secondary buffering type.
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*/
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const TUint32 KPDLSecondaryBufferingAmount = 0x00000004;
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/**
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* Initial Percentage of File download before starting playback.
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*/
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const TUint32 KPDLInitialBufferingPercentage = 0x00000005;
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#endif      // AUDIOCONFIGURATIONINTERNALCRKEYS_H
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// End of file