Current File : //usr/lib/python3/dist-packages/orca/sound.py
# Orca
#
# Copyright 2016 Orca Team.
#
# This library is free software; you can redistribute it and/or
# modify it under the terms of the GNU Lesser General Public
# License as published by the Free Software Foundation; either
# version 2.1 of the License, or (at your option) any later version.
#
# This library is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
# Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public
# License along with this library; if not, write to the
# Free Software Foundation, Inc., Franklin Street, Fifth Floor,
# Boston MA 02110-1301 USA.
"""Utilities for playing sounds."""
__id__ = "$Id:$"
__version__ = "$Revision:$"
__date__ = "$Date:$"
__copyright__ = "Copyright (c) 2016 Orca Team"
__license__ = "LGPL"
import gi
from gi.repository import GLib
try:
gi.require_version('Gst', '1.0')
from gi.repository import Gst
except Exception:
_gstreamerAvailable = False
else:
_gstreamerAvailable, args = Gst.init_check(None)
from . import debug
from .sound_generator import Icon, Tone
class Player:
"""Plays Icons and Tones."""
def __init__(self):
self._initialized = False
self._source = None
self._sink = None
self._player = None
self._pipeline = None
if not _gstreamerAvailable:
msg = 'SOUND ERROR: Gstreamer is not available'
debug.printMessage(debug.LEVEL_INFO, msg, True)
return
self.init()
def _onPlayerMessage(self, bus, message):
if message.type == Gst.MessageType.EOS:
self._player.set_state(Gst.State.NULL)
elif message.type == Gst.MessageType.ERROR:
self._player.set_state(Gst.State.NULL)
error, info = message.parse_error()
msg = f'SOUND ERROR: {error}'
debug.printMessage(debug.LEVEL_INFO, msg, True)
def _onPipelineMessage(self, bus, message):
if message.type == Gst.MessageType.EOS:
self._pipeline.set_state(Gst.State.NULL)
elif message.type == Gst.MessageType.ERROR:
self._pipeline.set_state(Gst.State.NULL)
error, info = message.parse_error()
msg = f'SOUND ERROR: {error}'
debug.printMessage(debug.LEVEL_INFO, msg, True)
def _onTimeout(self, element):
element.set_state(Gst.State.NULL)
return False
def _playIcon(self, icon, interrupt=True):
"""Plays a sound icon, interrupting the current play first unless specified."""
if interrupt:
self._player.set_state(Gst.State.NULL)
self._player.set_property('uri', f'file://{icon.path}')
self._player.set_state(Gst.State.PLAYING)
def _playTone(self, tone, interrupt=True):
"""Plays a tone, interrupting the current play first unless specified."""
if interrupt:
self._pipeline.set_state(Gst.State.NULL)
self._source.set_property('volume', tone.volume)
self._source.set_property('freq', tone.frequency)
self._source.set_property('wave', tone.wave)
self._pipeline.set_state(Gst.State.PLAYING)
duration = int(1000 * tone.duration)
GLib.timeout_add(duration, self._onTimeout, self._pipeline)
def init(self):
"""(Re)Initializes the Player."""
if self._initialized:
return
if not _gstreamerAvailable:
return
self._player = Gst.ElementFactory.make('playbin', 'player')
if self._player is None:
msg = 'SOUND ERROR: Gstreamer is available, but player is None'
debug.printMessage(debug.LEVEL_INFO, msg, True)
return
bus = self._player.get_bus()
bus.add_signal_watch()
bus.connect("message", self._onPlayerMessage)
self._pipeline = Gst.Pipeline(name='orca-pipeline')
bus = self._pipeline.get_bus()
bus.add_signal_watch()
bus.connect("message", self._onPipelineMessage)
self._source = Gst.ElementFactory.make('audiotestsrc', 'src')
self._sink = Gst.ElementFactory.make('autoaudiosink', 'output')
if self._source is None or self._sink is None:
return
self._pipeline.add(self._source)
self._pipeline.add(self._sink)
self._source.link(self._sink)
self._initialized = True
def play(self, item, interrupt=True):
"""Plays a sound, interrupting the current play first unless specified."""
if isinstance(item, Icon):
self._playIcon(item, interrupt)
elif isinstance(item, Tone):
self._playTone(item, interrupt)
else:
tokens = ["SOUND ERROR:", item, "is not an Icon or Tone"]
debug.printTokens(debug.LEVEL_INFO, tokens, True)
def stop(self, element=None):
"""Stops play."""
if not _gstreamerAvailable:
return
if element:
element.set_state(Gst.State.NULL)
return
if self._player:
self._player.set_state(Gst.State.NULL)
if self._pipeline:
self._pipeline.set_state(Gst.State.NULL)
def shutdown(self):
"""Shuts down the sound utilities."""
global _gstreamerAvailable
if not _gstreamerAvailable:
return
self.stop()
self._initialized = False
_gstreamerAvailable = False
_player = Player()
def getPlayer():
return _player
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