262 lines
9.4 KiB
HTML
Executable File
262 lines
9.4 KiB
HTML
Executable File
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<html>
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<head>
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<meta http-equiv="content-type" content="text/html; charset=utf-8"/>
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<title>Android - Porting Guide</title>
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<script src="http://www.google.com/uds/api?file=uds.js&v=1.0&key=internal-codesite" type="text/javascript"></script>
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<script src="http://code.google.com/js/codesite.pack.01312008.js" type="text/javascript"></script>
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<script language="JavaScript">
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function resizeHeight() {
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if(document.getElementById && !(document.all)) {
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height= document.getElementById('doxygen').contentDocument.body.scrollHeight + 20;
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document.getElementById('doxygen').style.height = height;
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}
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else if(document.all) {
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height= document.frames('doxygen').document.body.scrollHeight + 20;
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document.all.doxygen.style.height = height;
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<link href="http://code.google.com/css/codesite.pack.01312008.css" type="text/css" rel="stylesheet">
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</link>
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<!--[if IE]><link rel="stylesheet" type="text/css" href="/css/iehacks.css" /><![endif]-->
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<script src="http://code.google.com/android/assets/search_autocomplete.js"></script>
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<link rel="stylesheet" type="text/css" href="http://code.google.com/css/semantic_headers.css" />
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<link rel="stylesheet" type="text/css" href="http://code.google.com/android/assets/style.css" />
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<script>
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jQuery(document).ready(function() {
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jQuery("pre").addClass("prettyprint");
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});
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<style type="text/css">
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<!--
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h1,h2,h3 {
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color: #000000;
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}
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-->
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</style>
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</head>
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<body class="gc-documentation">
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<div id="gc-container">
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<a name="top"></a>
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<div id="skipto"> </div>
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<div id="langpref">
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<!--<a class="dropdown" href="/">English</a> <span>|</span> <a href="/more/">Site Directory</a> -->
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</div>
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<div id="gc-header">
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<div id="logo"><a href="http://code.google.com/android/index.html"><img src="http://code.google.com/android/images/logo_android.gif" alt="Android"/></a></div>
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<div id="search" style="inline">
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<div id="searchForm" class="searchForm" style="height: 44px;">
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<noscript>
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<style type="text/css">
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.searchForm {
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display : none !important;
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}
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.searchForm2 {
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display : inline !important;
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}
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</style>
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</noscript>
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<div id="searchForm2" class="searchForm2" style="display:none">
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<form id="searchbox_001456098540849067467:6whlsytkdqg" action="http://www.google.com/cse">
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<input type="hidden" name="cx" value="001456098540849067467:6whlsytkdqg" />
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<input type="hidden" name="cof" value="FORID:0" />
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<input type="text" name="q" maxlength="2048" size="41" autocomplete="off" title="Google Code Search"/>
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<input type="submit" name="sa" value="Search" title="Search"/>
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<br/>
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<div class="greytext">e.g. "ajax apis" or "open source"</div>
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</form>
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<div id="searchControl" class="search-control"></div>
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<div id="codesiteContent">
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<a name="gc-topnav-anchor"></a>
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<div id="gc-topnav">
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<h1>Android Platform Development Kit</h1>
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<ul class="gc-topnav-tabs">
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<li id="sdk_link"> <a href="http://code.google.com/android/index.html" title="Android Software Development Kit">SDK</a> </li>
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<li id="docs_link"> <a href="index.html" title="Official Android documentation">Docs</a> </li>
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<li id="faq_link"> <a href="http://code.google.com/android/kb/index.html" title="Answers to frequently asked questions about Android">FAQ</a> </li>
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<li> <a href="http://android-developers.blogspot.com/" title="Official Android blog">Blog</a> </li>
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<li> <a href="http://code.google.com/android/groups.html" title="Android developer forum">Group</a> </li>
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<li> <a href="http://code.google.com/android/terms.html" title="Android terms of service">Terms</a> </li>
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<li> <a href="mailto:android-pdk-feedback@google.com?subject=PDK%20Feedback&body=(filed%20from:%20audio_sub_system.html%20v0.6%20-%2025%20November%202008)%0D%0A%0D%0ASUMMARY:%0D%0A%0D%0A%0D%0A%0D%0ASTEPS%20TO%20REPRODUCE:%0D%0A%0D%0A%0D%0A%0D%0AADDITIONAL%20NOTES:">Report a Problem</a> </li>
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</ul>
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</div>
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<!-- end gc-topnav -->
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<div class="g-section g-tpl-180">
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<a name="gc-toc"></a>
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<div class="g-unit g-first" id="gc-toc">
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<ul>
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<li>
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<h1><a href="index.html">Documentation</a></h1>
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<ul>
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<li> <strong>Introduction</strong>
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<ul>
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<li><a href="system_requirements.html">Device Requirements</a></li>
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</ul>
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</li>
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<li> <strong>Dev Environment Setup</strong>
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<ul>
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<li><a href="build_system.html">Build System</a></li>
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</ul>
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</li>
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<li> <strong>Basic Bring up</strong>
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<ul>
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<li><a href="build_new_device.html">Building New Device</a></li>
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<li><a href="bring_up.html">Bring up</a></li>
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<li><a href="keymaps_keyboard_input.html">Keymaps and Keyboard</a></li>
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<li><a href="display_drivers.html">Display Drivers</a></li>
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</ul>
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</li>
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<li> <strong>Multimedia</strong>
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<ul>
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<li><a href="audio_sub_system.html">Audio</a></li>
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<li><a href="camera.html">Camera</a></li>
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</ul>
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</li>
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<li> <strong>Power Management</strong>
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<ul>
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<li><a href="power_management.html">Power Management</a></li>
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</ul>
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</li>
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<li> <strong>Networking</strong>
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<ul>
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<li><a href="wifi.html">Wi-Fi</a></li>
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<li><a href="gps.html">GPS</a></li>
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<li><a href="bluetooth.html">Bluetooth</a></li>
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</ul>
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</li>
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<li> <strong>Telephony</strong>
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<ul>
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<li><a href="telephony.html">Radio Interface Layer</a></li>
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</ul>
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</li>
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<li> <strong>Testing</strong>
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<ul>
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<li><a href="instrumentation_testing.html">Instrumentation Testing</a></li>
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</ul>
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</li>
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</ul>
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</li>
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</ul>
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</div>
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<a name="gc-pagecontent"></a>
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<div class="g-unit" id="gc-pagecontent">
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<div id="jd-content">
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<div class="jd-descr">
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<a name="androidAudioSubSystemTitle"></a><h1>Audio</h1>
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<a name="toc"/>
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<div style="padding:10px">
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<a href="#androidAudioSubSystemIntroduction">Introduction</a><br/>
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<a href="#androidAudioBuildingDriver">Building an Audio Library</a><br/>
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<a href="#androidAudioInterface">Interface</a><br/></div></font></div>
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<a name="androidAudioSubSystemIntroduction"></a><h2>Introduction</h2>
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<p>AudioHardwareInterface serves as the glue between proprietary audio drivers and the Android AudioFlinger service, the core audio service that handles all audio-related requests from applications.</p>
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<p><img src="android_audio_architecture.gif"></p>
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Solid elements represent Android blocks and dashed elements represent partner-specific blocks.
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<a name="androidAudioBuildingDriver"></a><h2>Building an Audio Library</h2>
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<p>To implement an audio driver, create a shared library that implements the interface defined in <code>AudioHardwareInterface.h</code>. You must name your shared library <code>libaudio.so</code> so that it will get loaded from <code>/system/lib</code> at runtime. Place libaudio sources and <code>Android.mk</code> in <code>partner/acme/chipset_or_board/libaudio/</code>.</p>
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<p>The following stub <code>Android.mk</code> file ensures that <code>libaudio</code> compiles and links to the appropriate libraries:</p>
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<pre class="prettify">
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LOCAL_PATH := $(call my-dir)
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include $(CLEAR_VARS)
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LOCAL_MODULE := libaudio
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LOCAL_SHARED_LIBRARIES := \
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libcutils \
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libutils \
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libmedia \
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libhardware
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LOCAL_SRC_FILES += MyAudioHardware.cpp
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LOCAL_CFLAGS +=
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LOCAL_C_INCLUDES +=
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LOCAL_STATIC_LIBRARIES += libaudiointerface
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include $(BUILD_SHARED_LIBRARY)
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</pre>
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<a name="androidAudioInterface"></a><h2>Interface</h2>
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<p class="note"><strong>Note</strong>: This document relies on some Doxygen-generated content that appears in an iFrame below. To return to the Doxygen default content for this page, <a href="audio_sub_system.html">click here</a>.</p>
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<iframe onLoad="resizeHeight();" src="_audio_hardware_interface_8h.html" scrolling="no" scroll="no" id="doxygen" marginwidth="0" marginheight="0" frameborder="0" style="width:100%;"></iframe>
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</div>
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<div id="gc-footer" dir="ltr">
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<div class="text"> ©2008 Google<!-- - <a href="/">Code Home</a> - <a href="http://www.google.com/accounts/TOS">Site Terms of Service</a> - <a href="http://www.google.com/privacy.html">Privacy Policy</a> - <a href="/more">Site Directory</a> --></div>
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<div id="jd-build-id"> v0.6 - 25 November 2008</div>
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</div></div></div></body>
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</html>
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