import logging from gi.repository import Gst from enum import Enum from lib.config import Config from lib.clock import Clock class AudioMix(object): def __init__(self, source=0): self.log = logging.getLogger('AudioMix') self.selectedSource = source self.caps = Config.get('mix', 'audiocaps') self.names = Config.getlist('mix', 'sources') self.log.info('Configuring Mixer for %u Sources', len(self.names)) pipeline = """ audiomixer name=mix ! {caps} ! queue ! tee name=tee tee. ! queue ! interaudiosink channel=audio_mix_out """.format( caps=self.caps ) if Config.getboolean('previews', 'enabled'): pipeline += """ tee. ! queue ! interaudiosink channel=audio_mix_preview """ if Config.getboolean('stream-blanker', 'enabled'): pipeline += """ tee. ! queue ! interaudiosink channel=audio_mix_streamblanker """ for idx, name in enumerate(self.names): pipeline += """ interaudiosrc channel=audio_{name}_mixer ! {caps} ! mix. """.format( name=name, caps=self.caps ) self.log.debug('Creating Mixing-Pipeline:\n%s', pipeline) self.mixingPipeline = Gst.parse_launch(pipeline) self.mixingPipeline.use_clock(Clock) self.log.debug('Binding Error & End-of-Stream-Signal ' 'on Mixing-Pipeline') self.mixingPipeline.bus.add_signal_watch() self.mixingPipeline.bus.connect("message::eos", self.on_eos) self.mixingPipeline.bus.connect("message::error", self.on_error) self.log.debug('Initializing Mixer-State') self.updateMixerState() self.log.debug('Launching Mixing-Pipeline') self.mixingPipeline.set_state(Gst.State.PLAYING) def updateMixerState(self): self.log.info('Updating Mixer-State') for idx, name in enumerate(self.names): volume = int(idx == self.selectedSource) self.log.debug('Setting Mixerpad %u to volume=%0.2f', idx, volume) mixerpad = (self.mixingPipeline.get_by_name('mix') .get_static_pad('sink_%u' % idx)) mixerpad.set_property('volume', volume) def setAudioSource(self, source): self.selectedSource = source self.updateMixerState() def getAudioSource(self): return self.selectedSource def on_eos(self, bus, message): self.log.debug('Received End-of-Stream-Signal on Mixing-Pipeline') def on_error(self, bus, message): self.log.debug('Received Error-Signal on Mixing-Pipeline') (error, debug) = message.parse_error() self.log.debug('Error-Details: #%u: %s', error.code, debug)