quick-and-dirty interface for the Griffin AirClick RF remote

airclick.py

#!/usr/bin/env python

import struct, os, subprocess

"""
030200?? - buttons that are currently down
      01 play/pause
      02 increase volume
      04 decrease volume
      08 next
      10 previous

??000000 - same thing, apparently, but with some bit twiddling done to it.
    (seems like this should indicate a change in state, but it doesn't)
"""


device = '/dev/hidraw4'
scriptdir = os.path.expanduser('~/.airclick/scripts')
scripts = [os.path.join(scriptdir, b) for b in 'play vol+ vol- next prev'.split()]


def action(btn, state):
    what = ['release', 'press'][state]
    os.chdir(scriptdir)
    subprocess.call([scripts[btn], what])

def main():
    f = open(device, 'rb')
    states = [False, False, False, False, False]
    while True:
        # Should match 030200xxyy000000
        magic, bmask = struct.unpack('>HxB4x', f.read(8))
        assert magic == 0x0302, "Protocol error"
        for btn in range(5):
            bit = 1 << btn
            new = bool(bmask & bit)
            if states[btn] != new:
                states[btn] = new
                action(btn, new)


if __name__ == '__main__': main()