VHAL | Key Components of Android Automotive OS

Posted 2022-12-10 Justin-Yip

The HAL of android Automotive OS

• • • 1. Audio HAL
    • • 1.1 Android audio HAL
      • • 1.2 Automotive Audio HAL
    • 2. HIDL Overview
    • 2.1、Pass through mode
    • • 2.1.1 Binderizing passthrough HALs
    • 2.3 HIDL grammar
    • • 2.3.1
      • 2.3.2

1. Audio HAL

1.1 Android audio HAL

1.2 Automotive Audio HAL

???to be understood

• Automotive Audio HAL relies on the standard Android audio HAL.
  • IDevice (hardware/interfaces/audio/2.0/IDevice.hal)
  • IStream (hardware/interfaces/audio/2.0/IStream.hal)

1. 2.1 configuring Audio Devices including following key components:

• Specify devicePorts
• Specify Module Name
• mixPort
• routes
  referring to
  device/generic/car/emulator/audio/overlay/packages/services/Car/service/res/values/config.xml.

1. 2.2

2. HIDL Overview

HAL interface definition language, HIDL (pronounced "hide-l")

2.1、Pass through mode

2.1.1 Binderizing passthrough HALs

2.3 HIDL grammar

• HIDL code style

2.3.1

代码如下（示例）：

import numpy as np
import pandas as pd
import matplotlib.pyplot as plt
import seaborn as sns
import warnings
warnings.filterwarnings('ignore')
import  ssl
ssl._create_default_https_context = ssl._create_unverified_context

2.3.2

代码如下（示例）：

data = pd.read_csv(
    'https://labfile.oss.aliyuncs.com/courses/1283/adult.data.csv')
print(data.head())

该处使用的url网络请求的数据。

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