This project is part of DES_03_Head-Unit to provide infotainment feature. Flutter was used to implement front end application. It uses CommonAPI and SOME/IP binding as IPC
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Gear Selection
Head-Unit application is capable of setting gears through touch screen. -
Music Player
Head-Unit application can play your favourite mp3 musics.
How? Just plug in your USB! -
Video Player
Head-Unit application can not only play music but also your favourite vidoes just like the music player. -
Dark Mode
Is the screen too bright for your eyes?
Don't worry! Head-Unit application support dark mode. -
USB media
All these applications should be installed in your linux build host to build this project
- vSOME/IP v3.4.10
- CommonAPI Core Runtime v3.2.3
- CommonAPI SOME/IP Runtime v3.2.3
- CarControl
- libmpv
Head-Unit application displays current gear on the left side of the screen. This section is always visible and accessable to the user. And also this section not only displays current gear but also is able to change gears by sending request to the controller application.
sequenceDiagram
HeadUnit->>CarControl: Gear Change Request
Note right of CarControl: If throttle is not 0,<br/>request will be rejected
CarControl-->>HeadUnit: Response
Music player uses media_kit to play media. When the music application widget is opened, the widget will try to read application's bundle directory and /media, /run/media for USB medium. Therefore to read and play media from USB, it is necessary to mount them on those directories. If the system does not mount usb or not on those directories, pleas configure yout udev rules accordingly.
Music player supports
- metadata
- progress bar
- scrollerable playback
- player control
- volume control
Metadata is fetched by using metadata_god package.
Progress bar was implemented by using Player.stream and rxdart.
On left bottom there is a floating action button, which will open drawer to show your current playlist.
Video player also uses media_kit to play video. Similar to the music player when the widget is opened, the widget will try to read /media, /run/media for videos in USB.
Video player uses MaterialVideoControls controller type since infotainment system only uses touch screen as input device rather then mouse like desktop environment.
User can choose theme between light mode or dark mode. ChangeNotifier was used to implement this feature, since cupertino widgets don't share same attributes in material app, it was necessary to override some attributes manually.
Foreign function interface(FFI) is necessary to use CommonAPI since flutter does not support it directly like dbus. CommonAPI-someip is used to communicate with other applications like CarControl and Dashboard applications. To build proxy and stub for CommonAPI, custom plugin is generated in the flutter build process. Source codes and CMakeLists.txt for this plugin is located in lib/ffi directory.
sequenceDiagram
title: Communication Scheme
HeadUnit->>libHeadUnit.so: Open Dynamic Library<br/>Function Lookup
Note left of libHeadUnit.so: Proxy and Stub<br/>instance is created
libHeadUnit.so->>Other CommonAPI Apps: Subscribe
Other CommonAPI Apps-->>libHeadUnit.so: Notify Events
HeadUnit->>libHeadUnit.so: Method Call
libHeadUnit.so->>Other CommonAPI Apps: Method Call
Other CommonAPI Apps-->>libHeadUnit.so: Response
libHeadUnit.so-->>HeadUnit: Response
Other CommonAPI Apps-->>libHeadUnit.so: Notify Events
package commonapi
interface HeadUnit {
version { major 0 minor 1 }
attribute Boolean lightMode readonly
attribute MetaData metadata readonly
struct MetaData {
UInt8[] albumcover
String artist
String title
}
}
libHeadUnit-someip.so provides proxy for other applications. In HeadUnit.fidl file, attributes are defined as shown on top. Flutter_Dashboard subscribes to these attributes to update it's widgets.
On Dashboard
Widgets are updated on other applications also!