Joystick support!

[mdraves91]

Hey all, I've added joystick support. You can now bind actions in a keyconfig file to one or more joysticks! All of the changes are explained in the commit comment and the changes to the readme, but I thought I'd highlight the most important one (binding joysticks in a key config) here.

The short version of it is to bind a joystick axis you use the following syntax:

ACTION:js /path/to/js a[number][+-]

and the following for a button:

ACTION:js /path/to/js b[number]

[number] is just the number of the axis or button (watch out, they can overlap! There can exist an axis 0 and a button 0), and [+-] indicates the direction of movement of the axis that should trigger the event. If a direction is missing, it won't work.

I've tested it a bit and it all looks okay, but I'd appreciate it if anyone else with a joystick handy could test it out too. Some cases that I've tested that work properly:

• Multiple joysticks
• No joysticks
• Binding the same action to keyboard and multiple joysticks
• Having multiple joysticks plugged in but only one (or none) defined.
• Having multiple joysticks defined in keyconfig but not all of them exist (i.e. some are unplugged). The joysticks that ARE plugged in work fine.

If you have any questions feel free to ask, or if you have any more edge cases you want me to try out let me know that too!

[popcornmix]

Thanks.
Someone is working on #10, which will make patches like this cleaner.
I'll need to check if it's better to accept this before or after #10.

[mdraves91]

I was a little worried that this might conflict with #10, but I wanted to add joystick support because my pi only has joysticks hooked up to it usually (it's pretty much an emulator box). If #10 gets implemented and it's better to not accept this request or I need to make some changes, that's fine. This isn't a very groundbreaking or vital feature, so if it doesn't get merged right away it's not really a problem.

[JontomXire]

Would this work with a games console style controller? I have a USB one I plan to use for playing games. It would be nice to be able to control omxplayer with it.

[Ruffio]

@popcornmix @mdraves91 is this PR going to be implemented?

[popcornmix]

I don't believe this should be implemented inside omxplayer.
The dbuscontrol.sh interface allows external programs/scripts to send control messages.
It would be pretty easy to make a C program (or even a bash script) that reads joystick events and sends dbuscontrol messages.

[Ruffio]

@mdraves91 can you close this PR, as it is not going to be implemeted

[Ruffio]

@mdraves91 please close this PR, as it is not going to be implemeted

[Ruffio]

@popcornmix is this going to be merged? Else reject it...