| <html devsite><head> |
| <title>配置共享库</title> |
| <meta name="project_path" value="/_project.yaml"/> |
| <meta name="book_path" value="/_book.yaml"/> |
| </head> |
| <body> |
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| Licensed under the Apache License, Version 2.0 (the "License"); |
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| |
| <p>创建<a href="/devices/audio/implement-policy.html">音频政策配置后</a>，您必须将 HAL 实现打包到共享库中，并将其复制到相应位置：</p> |
| |
| <ol> |
| <li>创建一个 <code>device/<company>/<device>/audio</code> 目录以包含您的库的源文件。</li> |
| <li>创建一个 <code>Android.mk</code> 文件来编译共享库。确保 Makefile 包含以下行：<br /> |
| <pre class="devsite-click-to-copy"> |
| LOCAL_MODULE := audio.primary.<device> |
| </pre> |
| <br /> |
| <p>您的库必须命名为 <code>audio.primary.<device>.so</code>，以便 Android 可以正确加载库。此文件名的 <code>primary</code> 部分表示此共享库用于设备上的主要音频硬件。模块名称 <code>audio.a2dp.<device></code> 和 <code>audio.usb.<device></code> 也可用于蓝牙和 USB 音频接口。以下是 Galaxy Nexus 音频硬件的 <code>Android.mk</code> 示例：</p> |
| |
| <pre class="devsite-click-to-copy"> |
| LOCAL_PATH := $(call my-dir) |
| |
| include $(CLEAR_VARS) |
| |
| LOCAL_MODULE := audio.primary.tuna |
| LOCAL_MODULE_RELATIVE_PATH := hw |
| LOCAL_SRC_FILES := audio_hw.c ril_interface.c |
| LOCAL_C_INCLUDES += \ |
| external/tinyalsa/include \ |
| $(call include-path-for, audio-utils) \ |
| $(call include-path-for, audio-effects) |
| LOCAL_SHARED_LIBRARIES := liblog libcutils libtinyalsa libaudioutils libdl |
| LOCAL_MODULE_TAGS := optional |
| |
| include $(BUILD_SHARED_LIBRARY) |
| </pre> |
| </li> |
| <br /> |
| <li>如果您的产品支持 Android CDD 指定的低延迟音频，请将相应的 XML 功能文件复制到您的产品中。例如，在您产品的 <code>device/<company>/<device>/device.mk</code> Makefile 中：<pre class="devsite-click-to-copy"> |
| PRODUCT_COPY_FILES := ... |
| |
| PRODUCT_COPY_FILES += \ |
| frameworks/native/data/etc/android.hardware.audio.low_latency.xml:system/etc/permissions/android.hardware.audio.low_latency.xml \ |
| </pre> |
| </li> |
| <br /> |
| <li>将您之前创建的音频政策配置文件复制到您产品的 <code>device/<company>/<device>/device.mk</code> Makefile 的 <code>system/etc/</code> 目录下。例如：<pre class="devsite-click-to-copy"> |
| PRODUCT_COPY_FILES += \ |
| device/samsung/tuna/audio/audio_policy.conf:system/etc/audio_policy.conf |
| </pre> |
| </li> |
| <br /> |
| <li>在您产品的 <code>device/<company>/<device>/device.mk</code> Makefile 中声明您的产品所需的音频 HAL 的共享模块。例如，Galaxy Nexus 需要主要音频 HAL 模块和蓝牙音频 HAL 模块：<pre class="devsite-click-to-copy"> |
| PRODUCT_PACKAGES += \ |
| audio.primary.tuna \ |
| audio.a2dp.default |
| </pre> |
| </li> |
| </ol> |
| |
| </body></html> |
