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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.signal import Signal
from lisp.modules.gst_backend.gi_repository import Gst
from lisp.modules.gst_backend.gst_element import GstMediaElement, GstProperty
class DbMeter(GstMediaElement):
ElementType = ElementType.Plugin
MediaType = MediaType.Audio
Name = QT_TRANSLATE_NOOP('MediaElementName', 'dB Meter')
interval = GstProperty('level', default=50 * Gst.MSECOND)
peak_ttl = GstProperty('level', default=Gst.SECOND, gst_name='peak-ttl')
peak_falloff = GstProperty('level', default=20, gst_name='peak-falloff')
def __init__(self, pipeline):
super().__init__()
self.level_ready = Signal()
self.pipeline = pipeline
self.level = Gst.ElementFactory.make('level', None)
self.level.set_property('post-messages', True)
self.level.set_property('interval', 50 * Gst.MSECOND)
self.level.set_property('peak-ttl', Gst.SECOND)
self.level.set_property('peak-falloff', 20)
self.audio_convert = Gst.ElementFactory.make('audioconvert', None)
self.pipeline.add(self.level)
self.pipeline.add(self.audio_convert)
self.level.link(self.audio_convert)
bus = self.pipeline.get_bus()
bus.add_signal_watch()
self._handler = bus.connect('message::element', self.__on_message)
def dispose(self):
bus = self.pipeline.get_bus()
bus.remove_signal_watch()
bus.disconnect(self._handler)
def sink(self):
return self.level
def src(self):
return self.audio_convert
def __on_message(self, bus, message):
if message.src == self.level:
structure = message.get_structure()
if structure is not None and structure.has_name('level'):
self.level_ready.emit(structure.get_value('peak'),
structure.get_value('rms'),
structure.get_value('decay'))
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