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<concept id="GUID-4AAABD77-C08E-5EE2-A02A-3B412EA6D23F" xml:lang="en"><title>Advanced

Audio Adaptation Framework Overview</title><prolog><metadata><keywords/></metadata></prolog><conbody>

<p>This document introduces you to the Advanced Audio Adaptation Framework

(A3F) component. </p>

<section><title>Purpose</title> <p>A3F provides the interface between the

Symbian platform and the audio processing hardware for all audio functionality.

A3F is responsible for: </p> <ul>

<li id="GUID-A2084086-B7AF-53FA-95D6-B4F209686B74"><p>Providing access to

all audio resources </p> </li>

<li id="GUID-11DB1466-1010-5FAC-A5A3-2FBB6C609385"><p>Configuring audio hardware </p> </li>

<li id="GUID-B7AD5DC5-C6F4-55FA-9D2B-DF138FDF8576"><p>Playing and recording

audio data </p> </li>

<li id="GUID-C3A15684-26C2-5013-8C1D-05C959B16008"><p>Playing tones. </p> </li>

</ul> </section>

<section><title>Required background</title> <p>In order to use A3F, you should

be familiar with <xref href="GUID-2D3F7471-9B92-5E49-B8BC-E0FA7AA709D7.dita">DevSound</xref>. </p> </section>

<section><title>Architectural relationships</title> <p>A3F is a component

in the Sound Device collection. A3F provides a new standardised implementation

of DevSound which is configured by default from Symbian OS v9.5 onwards. A3F

interacts with a specially customised DevSound (configured as optional). </p> <p>Shown

below is a representation of how A3F interacts with DevSound and other components: </p> <fig id="GUID-D45D43BE-CC91-5A92-B9C4-7E43B3899067">

<title>              A3F and related components            </title>

<image href="GUID-37C193CD-3D8A-56A5-B78C-0A6FE7163EC2_d0e529845_href.png" placement="inline"/>

</fig> </section>

<section><title>Library summary</title> <p>A3F includes the following libraries: </p> <table id="GUID-9A61E505-E46F-5811-9EC3-742AFD7444DE">

<tgroup cols="2"><colspec colname="col0"/><colspec colname="col1"/>

<thead>

<row>

<entry>Library</entry>

<entry>Description</entry>

</row>

</thead>

<tbody>

<row>

<entry><p> <b>Audio Component Framework</b>  </p> </entry>

<entry><p>The Audio Component Framework is responsible for creating audio

contexts. </p> <p>For more information, see <xref href="GUID-39B5850D-EAAD-56BC-B75A-2104033814E6.dita">Audio

Component Framework Overview</xref>. </p> </entry>

</row>

<row>

<entry><p> <b> Audio Component Library</b>  </p> </entry>

<entry><p>The Audio Component Library provides runtime control over audio

streams. </p> <p>For more information, see <xref href="GUID-06A43E09-CC6D-5799-A0F7-68B5696F4ADB.dita">Audio

Component Library Overview</xref>. </p> </entry>

</row>

</tbody>

</tgroup>

</table> </section>

<section><title>Typical uses</title> <p>You can use A3F to play tones, play

audio and record audio. The following list describes some of the steps involved

in playing and recording audio: </p> <ul>

<li id="GUID-E687D6B5-5844-513C-A70A-54671ECB9E2E"><p><xref href="GUID-931207BE-3561-562D-8F67-0FB52CFF83CD.dita#GUID-931207BE-3561-562D-8F67-0FB52CFF83CD/GUID-9027F6F9-F8AB-5A87-A1D3-9A554C014296">Create a new audio context</xref>  </p> </li>

<li id="GUID-BD2EF59E-DA7B-585C-9F83-4DDB7AAC32DA"><p><xref href="GUID-931207BE-3561-562D-8F67-0FB52CFF83CD.dita#GUID-931207BE-3561-562D-8F67-0FB52CFF83CD/GUID-F4E5DAD7-74D0-5946-98E5-D13C3FDF0F0D"> Apply changes made to the audio processing units in a context</xref>  </p> </li>

<li id="GUID-B9A47D94-8A0A-51A7-B982-481952597C68"><p><xref href="GUID-2A543E1C-F3DE-59EF-8A43-1B655F367FBC.dita#GUID-2A543E1C-F3DE-59EF-8A43-1B655F367FBC/GUID-14D6294E-64FB-58D9-85F8-FAE2A14367B1">Configure hardware devices, for example, set sampling rate and channels to

use.</xref>  </p> </li>

<li id="GUID-87F43B01-8965-5EF6-BE11-C5AE5B8B5573"><p><xref href="GUID-2A543E1C-F3DE-59EF-8A43-1B655F367FBC.dita#GUID-2A543E1C-F3DE-59EF-8A43-1B655F367FBC/GUID-F6BC242F-E977-5A57-B90D-00D8A6AF5BF8">Play buffered audio data</xref>  </p> </li>

<li id="GUID-509BF8AC-40D1-5378-B133-F0D9A5AE8DD6"><p><xref href="GUID-2A543E1C-F3DE-59EF-8A43-1B655F367FBC.dita#GUID-2A543E1C-F3DE-59EF-8A43-1B655F367FBC/GUID-C91CCA5D-2E5B-58D0-9EEE-B5F6C0095E2A">Record audio data to buffers</xref>  </p> </li>

<li id="GUID-E9D7E5BF-9561-5CAD-A21F-E8BC38605F82"><p><xref href="GUID-2A543E1C-F3DE-59EF-8A43-1B655F367FBC.dita#GUID-2A543E1C-F3DE-59EF-8A43-1B655F367FBC/GUID-E2FC5EC6-57C0-53BB-9A5F-DC8BDA12E725">Pause audio processing</xref>  </p> </li>

<li id="GUID-FB41A648-5084-5ADC-A695-22896CB36E62"><p><xref href="GUID-2A543E1C-F3DE-59EF-8A43-1B655F367FBC.dita#GUID-2A543E1C-F3DE-59EF-8A43-1B655F367FBC/GUID-495DC719-47C6-50B0-9A2D-9B00BEBA0E38">Stop playing audio</xref>  </p> </li>

<li id="GUID-53299A88-3789-5286-80E2-DE479EB852D9"><p><xref href="GUID-2A543E1C-F3DE-59EF-8A43-1B655F367FBC.dita#GUID-2A543E1C-F3DE-59EF-8A43-1B655F367FBC/GUID-93CB9072-728A-598E-AD61-141D7FC9257E">Stop recording audio</xref>. </p> </li>

</ul> </section>

<section><title>See also</title> <p><xref href="GUID-2D3F7471-9B92-5E49-B8BC-E0FA7AA709D7.dita"> DevSound

Overview</xref>  </p> <p><xref href="GUID-A243699D-699C-5E45-A000-54C8DB4FF7AB.dita">Multimedia

Framework Overview</xref>  </p> </section>