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Adaptation/GUID-73B853D5-13E6-54E7-AA8B-C41EEDB5EA7F.dita
author Graeme Price <GRAEME.PRICE@NOKIA.COM>
Fri, 15 Oct 2010 14:32:18 +0100
changeset 15 307f4279f433
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Initial contribution of the Adaptation Documentation.
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<?xml version="1.0" encoding="utf-8"?>
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<!-- Copyright (c) 2007-2010 Nokia Corporation and/or its subsidiary(-ies) All rights reserved. -->
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<!-- This component and the accompanying materials are made available under the terms of the License
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"Eclipse Public License v1.0" which accompanies this distribution,
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and is available at the URL "http://www.eclipse.org/legal/epl-v10.html". -->
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<!-- Initial Contributors:
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    Nokia Corporation - initial contribution.
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Contributors:
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-->
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<!DOCTYPE concept
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  PUBLIC "-//OASIS//DTD DITA Concept//EN" "concept.dtd">
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<concept id="GUID-73B853D5-13E6-54E7-AA8B-C41EEDB5EA7F" xml:lang="en"><title> RMdaDevSound-Based
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Driver Migration</title><shortdesc>Explains how to convert an <codeph>RMdaDevSound</codeph> -based
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sound driver to the current Sound Driver architecture. </shortdesc><prolog><metadata><keywords/></metadata></prolog><conbody>
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<p>Symbian converted the PDD of the <codeph>RMdaDevSound</codeph> based driver
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to an <xref href="GUID-B0118EDD-2B08-353E-BE92-2DC75E5622B3.dita"><apiname>RSoundSc</apiname></xref> version of the PDD. The same procedure was
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used for this on all three platforms. </p>
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<p>PDDs for the <codeph>RMdaDevSound</codeph> based driver have a significant
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amount of code that is dedicated to creating and managing a circular buffer, <codeph>DSoundBuffer</codeph>,
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for storing playback or record audio. In the <xref href="GUID-B0118EDD-2B08-353E-BE92-2DC75E5622B3.dita"><apiname>RSoundSc</apiname></xref> version
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of the driver, this is taken care of by the shared chunk and this code can
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be discarded. </p>
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<p>For the remaining PDD code, although the LDD to PDD interface for the <codeph>RMdaDevSound</codeph> based
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version is similar to the <xref href="GUID-B0118EDD-2B08-353E-BE92-2DC75E5622B3.dita"><apiname>RSoundSc</apiname></xref> version, it is best
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to start by taking a copy of the template port as described in <xref href="GUID-C6ABE2CA-901E-55F1-9837-7018A1612BCF.dita">Set
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Up</xref> , then fill in the sections marked TODO in the template code by
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cutting and pasting the relevant code coming from a single function, this
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is often called the same in each version of the driver. </p>
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<p>One complication comes if the <xref href="GUID-B0118EDD-2B08-353E-BE92-2DC75E5622B3.dita"><apiname>RSoundSc</apiname></xref> version is to
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support both record and playback driver channels, as this requires some of
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the functionality to be moved to the shared PDD factory object. </p>
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</conbody></concept>
MCL/sftools/depl/docscontent