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import subprocess
from ..config import config
from threading import Lock
from typing import Union, List
_lock = Lock()
_default_step = 5
def has_control(s: str) -> bool:
for control in config['amixer']['controls']:
if control['name'] == s:
return True
return False
def get_caps(s: str) -> List[str]:
for control in config['amixer']['controls']:
if control['name'] == s:
return control['caps']
raise KeyError(f'control {s} not found')
def get_all() -> list:
controls = []
for control in config['amixer']['controls']:
controls.append({
'name': control['name'],
'info': get(control['name']),
'caps': control['caps']
})
return controls
def get(control: str):
return call('get', control)
def mute(control):
return call('set', control, 'mute')
def unmute(control):
return call('set', control, 'unmute')
def cap(control):
return call('set', control, 'cap')
def nocap(control):
return call('set', control, 'nocap')
def _get_default_step() -> int:
if 'step' in config['amixer']:
return int(config['amixer']['step'])
return _default_step
def incr(control, step=None):
if step is None:
step = _get_default_step()
return call('set', control, f'{step}%+')
def decr(control, step=None):
if step is None:
step = _get_default_step()
return call('set', control, f'{step}%-')
def call(*args, return_code=False) -> Union[int, str]:
with _lock:
result = subprocess.run([config['amixer']['bin'], *args],
stdout=subprocess.PIPE,
stderr=subprocess.PIPE)
if return_code:
return result.returncode
if result.returncode != 0:
raise AmixerError(result.stderr.decode().strip())
return result.stdout.decode().strip()
class AmixerError(OSError):
pass
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