Linux, ALSA, C++, And the Joystick

[jbennet]

Ok, in a very simplified version ive got to write a C++ app to interface with a joystick and play various sounds depending on its position - Its a USB joystick and I will have a QT GUI.

This app already exists, for Windows/C# . I just need help porting it to C++/Linux.

Specifically, how to do the joystick and sound? Any ideas for libaries?

[nezachem]

A google search on alsa api returns many useful links. I am not familiar with Windows/C# audio model, so I don't know how well it is mapped onto alsa.

Regarding joystick, it is seen by the system as a serial device; you need to open it, query it with some ioctls (JSIOCGAXES and JSIOCGBUTTONS), and then just read struct js_event (see linux/joystick.h for reference).

[jbennet]

Would this code work?

http://archives.seul.org/linuxgames/Aug-1999/msg00107.html

[nezachem]

Most likely. The code is based on a fairly old kernel, but AFAIK not much has been changed since then.

[jbennet]

This was quite helpful, in case anyone else has the same problem finding info,

http://www.linuxjournal.com/article/6735?page=0,1

[jbennet]

RE: Sound, http://www.daniweb.com/software-development/cpp/threads/367488/1578959