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_audio_mixercontrol.py
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# Written by David Henningsson <david.henningsson@canonical.com> # 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()