Introduction

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.

Solid elements represent Android blocks and dashed elements represent partner-specific blocks.

Building an Audio Library

To implement an audio driver, create a shared library that implements the interface defined in AudioHardwareInterface.h. You must name your shared library libaudio.so so that it will get loaded from /system/lib at runtime. Place libaudio sources and Android.mk in partner/acme/chipset_or_board/libaudio/.

The following stub Android.mk file ensures that libaudio compiles and links to the appropriate libraries:

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 +=

LOCAL_STATIC_LIBRARIES += libaudiointerface

include $(BUILD_SHARED_LIBRARY)

Interface

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