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Android’s audio Hardware Abstraction Layer (HAL) connects the higher-level,audio-specific framework APIs in android.media to the underlying audio driver andhardware. This section includes implementation instructions and tips forimproving performance.
Android audio architecture defines how audio functionality is implemented andpoints to the relevant source code involved in the implementation.
Figure 1. Android audio architecture Drivers abook 520hd.
Application frameworkThe application framework includes the app code, which uses the android.media APIs tointeract with audio hardware. Internally, this code calls corresponding JNI glueclasses to access the native code that interacts with audio hardware.
JNIThe JNI code associated with android.media calls lower level native code to access audiohardware. JNI is located in frameworks/base/core/jni/ andframeworks/base/media/jni.Native frameworkThe native framework provides a native equivalent to the android.media package, callingBinder IPC proxies to access the audio-specific services of the media server.Native framework code is located in frameworks/av/media/libmedia.Binder IPCBinder IPC proxies facilitate communication over process boundaries. Proxies arelocated in frameworks/av/media/libmedia and begin with the letter'I'.Media serverThe media server contains audio services, which are the actual code thatinteracts with your HAL implementations. The media server is located inframeworks/av/services/audioflinger.HALThe HAL defines the standard interface that audio services call into and thatyou must implement for your audio hardware to function correctly. The audio HALinterfaces are located in hardware/libhardware/include/hardware.For details, see audio.h.Kernel driverThe audio driver interacts with your hardware and HAL implementation. You canuse Advanced Linux Sound Architecture (ALSA), Open Sound System (OSS), or acustom driver (HAL is driver-agnostic).
Note: If you use ALSA, we recommendexternal/tinyalsa for the user portion of the driver because of itscompatible licensing (the standard user-mode library is GPL-licensed).
Android native audio based on Open SL ES (not shown)
Drivers Rio Audio Mobile Phones & Portable Devices Am Fm
This API is exposed as part ofAndroid NDKand is at the same architecture level asandroid.media.
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