8281128a2e
Mixers now live in mopidy.mixers.<shortname>. Futhermore mopidy.mixers should now import each of the mixers so that doing import mopidy.mixers is enough to install the gstreamer elements.
73 lines
2.1 KiB
Python
73 lines
2.1 KiB
Python
import pygst
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pygst.require('0.10')
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import gobject
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import gst
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import logging
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logger = logging.getLogger('mopidy.mixers.auto')
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# TODO: we might want to add some ranking to the mixers we know about?
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class AutoAudioMixer(gst.Bin):
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__gstdetails__ = ('AutoAudioMixer',
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'Mixer',
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'Element automatically selects a mixer.',
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'Thomas Adamcik')
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def __init__(self):
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gst.Bin.__init__(self)
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mixer = self._find_mixer()
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if mixer:
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self.add(mixer)
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logger.debug('AutoAudioMixer chose: %s', mixer.get_name())
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else:
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logger.debug('AutoAudioMixer did not find any usable mixers')
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def _find_mixer(self):
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registry = gst.registry_get_default()
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factories = registry.get_feature_list(gst.TYPE_ELEMENT_FACTORY)
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factories.sort(key=lambda f: (-f.get_rank(), f.get_name()))
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for factory in factories:
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# Avoid sink/srcs that implment mixing.
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if factory.get_klass() != 'Generic/Audio':
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continue
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# Avoid anything that doesn't implment mixing.
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elif not factory.has_interface('GstMixer'):
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continue
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if self._test_mixer(factory):
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return factory.create()
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return None
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def _test_mixer(self, factory):
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element = factory.create()
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if not element:
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return False
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try:
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result = element.set_state(gst.STATE_READY)
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if result != gst.STATE_CHANGE_SUCCESS:
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return False
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# Trust that the default device is sane and just check tracks.
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return self._test_tracks(element)
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finally:
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element.set_state(gst.STATE_NULL)
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def _test_tracks(self, element):
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# Only allow elements that have a least one output track.
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flags = gst.interfaces.MIXER_TRACK_OUTPUT
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for track in element.list_tracks():
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if track.flags & flags:
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return True
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return False
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gobject.type_register(AutoAudioMixer)
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gst.element_register (AutoAudioMixer, 'autoaudiomixer', gst.RANK_MARGINAL)
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