# -*- python -*-
'''
xpybar – xmobar replacement written in python
Copyright © 2014, 2015, 2016, 2017, 2018 Mattias Andrée (maandree@kth.se)
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
'''
import alsaaudio
class ALSA:
'''
ALSA volume controller
@variable cardindex:int The index of the audio card
@variable cardname:str The name of the audio card, will be
'default' if the default audio card is selected
using it's logical name or logical index
@variable mixername:str The name of the mixer
@variable mixer:alsaaudio.Mixer The mixer object used internally by this class
'''
ALL_CHANNELS = -1
'''
:int Channel index that selects all available channels
'''
DEFAULT_CARD = -1
'''
:int Logical index of the default audio card
'''
def __init__(self, card = -1, mixername = 'Master', *, cardindex = None):
'''
Constructor
@param card:int|str The index or name of the audio card,
`ALSA.DEFAULT_CARD` (-1) or 'default' for the default card
@param mixername:str The name of the mixer
'''
if card == -1 and cardindex is not None: # For backwards compatibility
card = cardindex
if isinstance(card, str):
if card == 'default':
card = -1
else:
card = alsaaudio.cards().index(card)
self.cardindex = card
self.mixername = mixername
self.mixer = alsaaudio.Mixer(self.mixername, 0, self.cardindex)
self.cardname = self.mixer.cardname
def get_volume(self):
'''
Get the volume for each channel on the mixer
@return :list<int?> The [0, 100] volume for each channel, `None` on a channel indicate that it is muted
'''
self.mixer = alsaaudio.Mixer(self.mixername, 0, self.cardindex)
vs = self.mixer.getvolume()
try:
ms = self.mixer.getmute()
except:
ms = [0] * len(vs)
return [v if m == 0 else None for (v, m) in zip(vs, ms)]
def set_volume(self, volume, channel = -1):
'''
Set the volume for a channel on the mixer
@param volume:int? The [0, 100] volume for the channel, `None` to mute the channel
@param channel:int The index of the channel, `ALSA.ALL_CHANNELS` (-1) for all channels
'''
if volume is None:
self.mixer.setmute(1, channel)
else:
self.mixer.setvolume(volume, channel)
try:
self.mixer.setmute(0, channel)
except:
pass # some mixers do not have mute switch
def get_mute(self):
'''
Get the mute status for each channel on the mixer
@return :list<bool> Whether mixer is muted for each channel
'''
self.mixer = alsaaudio.Mixer(self.mixername, 0, self.cardindex)
try:
return [m == 1 for m in self.mixer.getmute()]
except:
return [False] * len(self.mixer.getvolume())
def set_mute(self, mute, channel = -1):
'''
Set the mute status on the mixer
@param mute:bool Whether the mixer should be muted on the channel
@param channel:int The index of the channel, `ALSA.ALL_CHANNELS` (-1) for all channels
'''
self.mixer.setmute(mute, channel)
@staticmethod
def get_cards():
'''
Get the names of all available audio cards
@return :list<str> The names of all available audio cards
'''
return alsaaudio.cards()
@staticmethod
def get_mixers(card = -1, *, cardindex = None):
'''
Get the names of all available mixers for an audio card
@param card:int|str The index or name of the audio card,
`ALSA.DEFAULT_CARD` (-1) or 'default' for the default card
@return :list<str> The names of all available mixers for an audio card
'''
if card == -1 and cardindex is not None: # For backwards compatibility
card = cardindex
if isinstance(card, str):
if card == 'default':
card = -1
else:
card = alsaaudio.cards().index(card)
return alsaaudio.mixers(card)
