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Niellun
110 lines
5.2 KiB
Markdown
110 lines
5.2 KiB
Markdown
# FastCarPlay
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This is C++ implementation of carplay receiver for "Autobox" dongles.
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The purpose of the project was to make application lightweight to run on Raspberry PI Zero 2W and use hardware decoding.
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# Dongles
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The dongles are readily available from Amazon or Aliexpress labeled by Carlinkit. They also seems to have official web site https://www.carlinkit.com/.
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Devices might have different vendor and product id's. Check your with lsusb and update settings if necessary.
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# Setup
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## Dependencies
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The project is based on SDL2, FFMPEG, LIBUSB. It use XXD for resource embedding.
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```
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sudo apt install build-essential xxd libsdl2-dev libsdl2-ttf-dev libavformat-dev libavcodec-dev libavutil-dev libswscale-dev libusb-1.0-0-dev
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```
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To run the application you also need to install runtime
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```
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sudo apt install ffmpeg libsdl2-2.0-0 libsdl2-ttf-2.0-0 libavformat59 libavcodec61 libavutil57 libswscale7 libusb-1.0-0
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```
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## Build and run
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The application can be started with settings file. Sample of the settings file can be found in settings.txt
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The project is using make. From the repository root run following
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```
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make clean
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make release
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./out/app ./settings.txt
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```
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## USB Permissions and device id
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On linux app may not have permisiions to read USB device. You need to create udev rule to grant persmissions for dongle.
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First you need to figure out your idVendor and idProduct.
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```
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lsusb
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```
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You will see list of devices, try to find the one that looks like dongle. Also you might need to run lsusb several time, cause my dongle seems to be disconnecting all the time. You need to find line like
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```
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Bus 003 Device 066: ID 1314:1520 Magic Communication Tec. Auto Box
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```
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So in my case ID 1314:1520 shows idVendor 1314 and idProduct 1520. We need to use those to create udev rules. If yours are different you also need to put them in settings.txt and run application with settings.txt as argument. Remember that in settings.txt values are in decimal, so you need to convert hex values to base 10 first.
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Create udev rules, replace <__Vendor__> <__Product__> and <__Your user__> with your informations
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```
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echo 'SUBSYSTEM=="usb", ATTRS{idVendor}=="<__Vendor__>", ATTRS{idProduct}=="<__Product__>", GROUP="<__Your user__>", MODE="0660"' | sudo tee /etc/udev/rules.d/50-carlinkit.rules
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## example
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## UBSYSTEM=="usb", ATTRS{idVendor}=="1314", ATTRS{idProduct}=="1520", GROUP="linux", MODE="0660"
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sudo udevadm control --reload-rules
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sudo udevadm trigger
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```
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## Customisation
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You can change font and background images by replacing files in ./src/resource
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- background.bmp for background image. Use BMP format only.
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- font.ttf for font. Use TTF fdrmat only
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The names of the file need to be exactly same. Resources are embedded in executable, remake the project to regenerate resources
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```
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make clean
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make release
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```
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## Keys
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The following keys have been mapped:
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- Left - navigate left
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- Right - navigate right
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- Enter - select active item
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- Backspace - Go back
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- f - toggle fullscreen mode
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# Status
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What is working:
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- Video
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- Audio (multiple channels)
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- Key navigation
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- Simple touch
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What is not working:
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- Multi touch - i have no means to test it
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- Microphone - that's next step for me to figure out how to feed sound
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- Telephone - the listening part will work, but because there is no mic implementation you can't speak
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## Notes
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Regardless the resolution there are 2 types of settings
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- source-width source-height source-fps - defines what video parameters will be requested from device
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- width height fps - defines video drawing resolution and fps
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The SDL will anyway scale the image to your screen/window size using internal HW scaling, so ideally you should use same values for width and height.
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If the source parameters will be different the scaling will be applied, however that scaling is not hardware accelerated and can consume a lot of CPU.
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You can set the 'scaler' in setting to define scaling algorithm. On my Raspbery Pi Zero 2W even easiest algorithm loads CPU to 100% and cause fram drop.
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Increasing FPS above Source-FPS will cause app to run UI loop with less delays and do more event polling. This can increase responsivenes of the system, but also will make X11 to use more resources.
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## Next plans
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- Implement direct buffer transfer from video decoder to renderer (should reduce amount of memory copies and CPU load)
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- Control audio buffers better (now system use 3 decoding threads but in reality only 2 required)
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- Reduce music volume when there is navigation messages
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- Add abilities to run script on device connect and device disconnect
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# Acknowledgement
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The project is inspired and based on great work done by other developers:
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- 
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- 
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- 
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- 
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The project is licenced under GPL-3 licence. See LICENCE for details.
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The project is using  font. See FONT_LICENCE for details.
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# Finally
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If you have any questions, suggestions or you find problems running this feel free to open issue.
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