161 lines
5.5 KiB
Python
161 lines
5.5 KiB
Python
import pygst
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pygst.require('0.10')
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import gst
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import logging
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from pykka.actor import ThreadingActor
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from mopidy import settings
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from mopidy.outputs.base import BaseOutput
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logger = logging.getLogger('mopidy.outputs.gstreamer')
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class GStreamerOutput(ThreadingActor, BaseOutput):
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"""
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Audio output through `GStreamer <http://gstreamer.freedesktop.org/>`_.
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**Settings:**
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- :attr:`mopidy.settings.GSTREAMER_AUDIO_SINK`
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"""
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def __init__(self):
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self.gst_pipeline = None
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def post_start(self):
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self._setup_gstreamer()
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def _setup_gstreamer(self):
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"""
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**Warning:** :class:`GStreamerOutput` requires
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:class:`mopidy.utils.process.GObjectEventThread` to be running. This is
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not enforced by :class:`GStreamerOutput` itself.
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"""
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logger.debug(u'Setting up GStreamer pipeline')
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self.gst_pipeline = gst.parse_launch(' ! '.join([
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'audioconvert name=convert',
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'volume name=volume',
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settings.GSTREAMER_AUDIO_SINK,
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]))
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pad = self.gst_pipeline.get_by_name('convert').get_pad('sink')
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if settings.BACKENDS[0] == 'mopidy.backends.local.LocalBackend':
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uri_bin = gst.element_factory_make('uridecodebin', 'uri')
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uri_bin.connect('pad-added', self._process_new_pad, pad)
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self.gst_pipeline.add(uri_bin)
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else:
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app_src = gst.element_factory_make('appsrc', 'appsrc')
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app_src_caps = gst.Caps("""
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audio/x-raw-int,
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endianness=(int)1234,
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channels=(int)2,
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width=(int)16,
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depth=(int)16,
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signed=(boolean)true,
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rate=(int)44100""")
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app_src.set_property('caps', app_src_caps)
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self.gst_pipeline.add(app_src)
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app_src.get_pad('src').link(pad)
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# Setup bus and message processor
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gst_bus = self.gst_pipeline.get_bus()
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gst_bus.add_signal_watch()
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gst_bus.connect('message', self._process_gstreamer_message)
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def _process_new_pad(self, source, pad, target_pad):
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pad.link(target_pad)
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def _process_gstreamer_message(self, bus, message):
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"""Process messages from GStreamer."""
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if message.type == gst.MESSAGE_EOS:
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logger.debug(u'GStreamer signalled end-of-stream. '
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'Sending end_of_track to core_queue ...')
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self.core_queue.put({'command': 'end_of_track'})
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elif message.type == gst.MESSAGE_ERROR:
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self.set_state('NULL')
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error, debug = message.parse_error()
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logger.error(u'%s %s', error, debug)
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# FIXME Should we send 'stop_playback' to the backend here? Can we
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# differentiate on how serious the error is?
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def play_uri(self, uri):
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"""Play audio at URI"""
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self.set_state('READY')
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self.gst_pipeline.get_by_name('uri').set_property('uri', uri)
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return self.set_state('PLAYING')
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def deliver_data(self, capabilities, data):
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"""Deliver audio data to be played"""
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app_src = self.gst_pipeline.get_by_name('appsrc')
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caps = gst.caps_from_string(caps_string)
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buffer_ = gst.Buffer(buffer(data))
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buffer_.set_caps(caps)
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app_src.set_property('caps', caps)
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app_src.emit('push-buffer', buffer_)
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def end_of_data_stream(self):
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"""
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Add end-of-stream token to source.
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We will get a GStreamer message when the stream playback reaches the
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token, and can then do any end-of-stream related tasks.
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"""
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self.gst_pipeline.get_by_name('appsrc').emit('end-of-stream')
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def get_position(self):
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try:
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position = self.gst_pipeline.query_position(gst.FORMAT_TIME)[0]
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return position // gst.MSECOND
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except gst.QueryError, e:
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logger.error('time_position failed: %s', e)
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return 0
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def set_position(self, position):
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self.gst_pipeline.get_state() # block until state changes are done
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handeled = self.gst_pipeline.seek_simple(gst.Format(gst.FORMAT_TIME),
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gst.SEEK_FLAG_FLUSH, position * gst.MSECOND)
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self.gst_pipeline.get_state() # block until seek is done
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return handeled
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def set_state(self, state_name):
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"""
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Set the GStreamer state. Returns :class:`True` if successful.
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.. digraph:: gst_state_transitions
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"NULL" -> "READY"
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"PAUSED" -> "PLAYING"
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"PAUSED" -> "READY"
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"PLAYING" -> "PAUSED"
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"READY" -> "NULL"
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"READY" -> "PAUSED"
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:param state_name: NULL, READY, PAUSED, or PLAYING
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:type state_name: string
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:rtype: :class:`True` or :class:`False`
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"""
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result = self.gst_pipeline.set_state(
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getattr(gst, 'STATE_' + state_name))
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if result == gst.STATE_CHANGE_FAILURE:
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logger.warning('Setting GStreamer state to %s: failed', state_name)
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return False
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else:
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logger.debug('Setting GStreamer state to %s: OK', state_name)
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return True
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def get_volume(self):
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"""Get volume in range [0..100]"""
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gst_volume = self.gst_pipeline.get_by_name('volume')
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return int(gst_volume.get_property('volume') * 100)
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def set_volume(self, volume):
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"""Set volume in range [0..100]"""
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gst_volume = self.gst_pipeline.get_by_name('volume')
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gst_volume.set_property('volume', volume / 100.0)
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return True
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