843a6d8b7d
Original author: mritter Merged from: //branches/cupcake/... Automated import of CL 146204
57 lines
2.1 KiB
Plaintext
Executable File
57 lines
2.1 KiB
Plaintext
Executable File
page.title=Audio
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pdk.version=1.0
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@jd:body
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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="resizeDoxFrameHeight();" 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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