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# -*- coding: utf-8 -*-
#
# This file is part of Linux Show Player
#
# Copyright 2012-2016 Francesco Ceruti <ceppofrancy@gmail.com>
#
# Linux Show Player is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# Linux Show Player 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 General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with Linux Show Player. If not, see <http://www.gnu.org/licenses/>.
from PyQt5.QtCore import QT_TRANSLATE_NOOP
from lisp.backend.media_element import ElementType, MediaType
from lisp.core.has_properties import Property
from lisp.modules.gst_backend.gi_repository import Gst
from lisp.modules.gst_backend.gst_element import GstMediaElement
class Speed(GstMediaElement):
ElementType = ElementType.Plugin
MediaType = MediaType.Audio
Name = QT_TRANSLATE_NOOP('MediaElementName', 'Speed')
speed = Property(default=1.0)
def __init__(self, pipeline):
super().__init__()
self.pipeline = pipeline
self.scale_tempo = Gst.ElementFactory.make("scaletempo", None)
self.audio_convert = Gst.ElementFactory.make("audioconvert", None)
self.pipeline.add(self.scale_tempo)
self.pipeline.add(self.audio_convert)
self.scale_tempo.link(self.audio_convert)
bus = self.pipeline.get_bus()
bus.add_signal_watch()
self._handler = bus.connect("message", self.__on_message)
self._old_speed = self.speed
self.changed('speed').connect(self.__prepare_speed)
def __prepare_speed(self, value):
if self._old_speed != value:
self._old_speed = value
if self.pipeline.current_state == Gst.State.PLAYING:
self.__change_speed()
def sink(self):
return self.scale_tempo
def src(self):
return self.audio_convert
def dispose(self):
bus = self.pipeline.get_bus()
bus.remove_signal_watch()
bus.disconnect(self._handler)
def __on_message(self, bus, message):
if (message.type == Gst.MessageType.STATE_CHANGED and
message.src == self.scale_tempo and
message.parse_state_changed()[1] == Gst.State.PLAYING):
self.__change_speed()
def __change_speed(self):
current_position = self.scale_tempo.query_position(Gst.Format.TIME)[1]
self.scale_tempo.seek(self.speed,
Gst.Format.TIME,
Gst.SeekFlags.FLUSH | Gst.SeekFlags.ACCURATE,
Gst.SeekType.SET,
current_position,
Gst.SeekType.NONE,
0)
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