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import oss
import twisted.spread.pb
import McFoo.observe
from errno import ENOENT, EINVAL
class VolumeObserver(McFoo.observe.Observer):
def remote_change(self, left, right):
pass
class VolumeControl:
def __init__(self):
try:
self.mixer=oss.open_mixer("/dev/sound/mixer")
except IOError, e:
if e.errno == ENOENT:
self.mixer=oss.open_mixer("/dev/mixer")
else:
raise
self.observers=McFoo.observe.Observers()
def _read(self):
try:
(left, right) = self.mixer.read_channel(oss.SOUND_MIXER_PCM)
except IOError, e:
if e.errno == EINVAL:
(left, right) = self.mixer.read_channel(oss.SOUND_MIXER_VOLUME)
else:
raise
return (left, right)
def _write(self, left, right):
try:
self.mixer.write_channel(oss.SOUND_MIXER_PCM, (left, right))
except IOError, e:
if e.errno == EINVAL:
self.mixer.write_channel(oss.SOUND_MIXER_VOLUME, (left, right))
else:
raise
def get(self, wantstereo=0):
(left, right) = self._read()
if wantstereo:
return (left, right)
else:
return (left+right)/2
def set(self, vol_left, vol_right=None):
(left, right) = self._read()
if vol_right==None:
average=(left+right)/2.0
if average==0:
left=right=vol_left
else:
left=int(left/average * vol_left)
right=int(right/average * vol_left)
else:
left=vol_left
right=vol_right
if left<0:
left=0
if left>100:
left=100
if right<0:
right=0
if right>100:
right=100
self._write(left, right)
self.observers('change', left, right)
return self.get()
def adjust(self, adjust_left=5, adjust_right=None):
if adjust_right==None:
adjust_right=adjust_left
(left, right) = self._read()
self.set(left+adjust_left, right+adjust_right)
def inc(self, adjust=None):
if adjust==None:
adjust=5
self.adjust(adjust)
def dec(self, adjust=None):
if adjust==None:
adjust=-5
self.adjust(adjust)
def __getstate__(self):
l,r=self.get(wantstereo=1)
return {'left':l, 'right':r}
def __setstate__(self, state):
self.__init__()
if state.has_key('left'):
if state.has_key('right'):
self.set(state['left'], state['right'])
else:
self.set(state['left'])
def observe(self, callback):
l,r=self.get(wantstereo=1)
self.observers.append_and_call(callback,
'change',
l, r)
def unobserve(self, callback):
self.observers.remove(callback)
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