| page.title=Audio |
| pdk.version=1.0 |
| doc.type=guide |
| @jd:body |
| |
| <div id="qv-wrapper"> |
| <div id="qv"> |
| <h2>In this document</h2> |
| <a name="toc"/> |
| <ul> |
| <li><a href="#androidAudioBuildingDriver">Building an Audio Library</a></li> |
| <li><a href="#androidAudioInterface">Interface</a></li> |
| </ul> |
| </div> |
| </div> |
| |
| |
| <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> |
| <p><img src="images/android_audio_architecture.gif"></p> |
| |
| Solid elements represent Android blocks and dashed elements represent partner-specific blocks. |
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| <a name="androidAudioBuildingDriver"></a><h3>Building an Audio Library</h3> |
| |
| <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>vendor/acme/chipset_or_board/libaudio/</code>.</p> |
| <p>The following stub <code>Android.mk</code> file ensures that <code>libaudio</code> compiles and links to the appropriate libraries:</p> |
| |
| <pre class="prettify"> |
| LOCAL_PATH := $(call my-dir) |
| include $(CLEAR_VARS) |
| |
| LOCAL_MODULE := libaudio |
| |
| LOCAL_SHARED_LIBRARIES := \ |
| libcutils \ |
| libutils \ |
| libmedia \ |
| libhardware |
| |
| LOCAL_SRC_FILES += MyAudioHardware.cpp |
| |
| LOCAL_CFLAGS += |
| |
| LOCAL_C_INCLUDES += |
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| LOCAL_STATIC_LIBRARIES += libaudiointerface |
| |
| include $(BUILD_SHARED_LIBRARY) |
| </pre> |
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| |
| <a name="androidAudioInterface"></a><h3>Interface</h3> |
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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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