5f6ca4f519
These are new content files for the partner development kit that will be hosted off of source.android.com externally. Automated import of CL 148105
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>
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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="images/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="AudioHardwareInterface_8h.html" scrolling="no" scroll="no" id="doxygen" marginwidth="0" marginheight="0" frameborder="0" style="width:100%;"></iframe>
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