Viewing file:  _audio_mixercontrol.py (3.84 KB) -rw-r--r--
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# Written by David Henningsson <[email protected]>
# Copyright Canonical Ltd 2010.
# Licensed under GPLv3.
from _audio_data import run_subprocess
import re
class MixerControl:
''' A simple mixer control '''
def parse_amixer(self, amixer_data):
self.name = amixer_data[0][len("Simple mixer control "):]
self.amixer_dict = {}
for line in amixer_data:
s = line.split(":")
if (len(s) != 2):
continue
self.amixer_dict[s[0].strip()] = s[1].strip()
self.caps = set(self.amixer_dict['Capabilities'].split(" "))
if not 'Playback channels' in self.amixer_dict:
pchan_set = set()
else:
pchan_set = set(self.amixer_dict['Playback channels'].split(" - "))
self.has_dB = True
self.pchans = {}
for c in pchan_set:
self.pchans[c] = {}
s = self.amixer_dict[c]
m = re.search("\[([\-0-9.]+)dB\]", s)
if m is None:
self.has_dB = False
else:
self.pchans[c]['dB'] = float(m.group(1))
if re.search("\[on\]", s):
self.pchans[c]['muted'] = False
if re.search("\[off\]", s):
self.pchans[c]['muted'] = True
m = re.search(" ?(\d+) ", s)
if m is not None:
self.pchans[c]['value'] = int(m.group(1))
m = re.search("\[([\-0-9.]+)%\]", s)
if m is not None:
self.pchans[c]['percent'] = float(m.group(1))
def __init__(self, amixer_data, device_name):
self.device_name = device_name
self.parse_amixer(amixer_data)
def get_pretty_name(self):
s = self.name.split("'")
t = int(s[2].split(",")[1])
s = s[1]
if (t > 0):
return s + " " + str(t)
return s
def get_caps(self):
return self.caps
def do_get(self):
s = run_subprocess(("amixer", "-D", self.device_name, "sget",
self.name))
self.parse_amixer(s.splitlines())
def do_set(self, *args):
run_subprocess(("amixer", "-D", self.device_name, "--", "sset",
self.name) + args)
def get_pstate(self):
self.do_get()
return self.pchans
def set_dB(self, level):
s = '{0:.4f}dB'.format(level)
if ("pswitch" in self.caps) or ("pswitch-joined" in self.caps):
self.do_set(s, "unmute")
else:
self.do_set(s)
def set_mute(self, is_muted):
if is_muted:
self.do_set("mute")
else:
self.do_set("unmute")
def set_original(self):
for (k,v) in self.pchans.iteritems():
t = [] # t = [k] didn't work
if 'value' in v: t.append(str(v['value']))
if 'muted' in v: t.append("mute" if v['muted'] else "unmute")
if len(t) <= 0: return
self.do_set(*t)
class MixerControlList:
def __init__(self, device_name, report):
self.device_name = device_name
self.parse_amixer(report)
def parse_amixer(self, report):
r = run_subprocess(report, "Symptom_amixer", ["amixer", "-D", self.device_name, "scontents"])
self.controls = []
s = []
for line in r.splitlines():
if (s != []) and (not line.startswith(" ")):
self.controls.append(MixerControl(s, self.device_name))
s = []
s.append(line)
if (s != []):
self.controls.append(MixerControl(s, self.device_name))
def get_control_cap(self, cap_list):
result = []
for c in self.controls:
if len(c.get_caps().intersection(set(cap_list))) > 0:
result.append(c)
return result
def restore_all(self):
for c in self.controls:
c.set_original()
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