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# Copyright (C) 2011 Paul W. Frields and others.
# -*- coding: utf-8 -*-
#
# This program 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.
#
# This program 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 this program. If not, see <http://www.gnu.org/licenses/>.
#
#
# Author: Paul W. Frields <stickster@gmail.com>
from config import *
import gtk
import pygst
import gobject
pygst.require('0.10')
import gst
from pulseaudio.PulseObj import PulseObj
class PulseCasterSource:
'''A source object that provides sound data for PulseCaster'''
def __init__(self):
'''Construct the source object'''
# Should include a PA source, a GtkCombBox, and a GtkProgressBar
self.store = gtk.ListStore(gobject.TYPE_STRING,
gobject.TYPE_STRING,
gobject.TYPE_PYOBJECT)
self.bus = None
self.cbox = gtk.ComboBox(self.store)
self.cell = gtk.CellRendererText()
self.cbox.pack_start(self.cell, True)
self.cbox.add_attribute(self.cell, 'text', True)
self.cbox.connect('changed', self.set_meters)
self.pbar = gtk.ProgressBar()
self.pipeline = None
print 'out of __init__'
def repopulate(self, pa, use_source=True, use_monitor=True):
'''Repopulate the ComboBox for this object'''
print 'in repopulate'
sources = pa.pulse_source_list()
self.store.clear()
for source in sources:
if source.monitor_of_sink_name == None:
if use_source == True:
self.store.append([source.name,
source.description,
source])
else:
if use_monitor == True:
self.store.append([source.name,
source.description,
source])
# Don't leave without resetting a source
self.cbox.set_active(0)
print 'out of repopulate'
def create_level_pipeline(self, *args):
'''Make a GStreamer pipeline that allows level checking'''
print 'in create_level_pipeline'
pl = 'pulsesrc device=%s' % (self.pulsesrc)
pl += ' ! level message=true interval=100000000 ! fakesink'
print pl
self.pipeline = gst.parse_launch(pl)
self.pipeline.get_bus().add_signal_watch()
self.conn = self.pipeline.get_bus().connect('message::element', self.update_level)
self.pipeline.set_state(gst.STATE_PLAYING)
print 'out of create_level_pipeline'
def remove_level_pipeline(self, *args):
'''Tear down the GStreamer pipeline attached to this object'''
print 'in remove_level_pipeline'
self.pipeline.set_state(gst.STATE_NULL)
self.pipeline.get_bus().remove_signal_watch()
self.pipeline.get_bus().disconnect(self.conn)
self.conn = None
self.pipeline = None
print 'out of remove_level_pipeline'
def set_meters(self, *args):
print 'in set_meters'
self.cbox.set_sensitive(False)
if self.pipeline is not None:
self.remove_level_pipeline()
i = self.cbox.get_active_iter()
if i is not None:
self.pulsesrc = self.cbox.get_model().get_value(i, 0)
self.create_level_pipeline()
self.cbox.set_sensitive(True)
print 'out of set_meters'
def update_level(self, bus, message, *args):
'''Update this object's GtkProgressBar to reflect current level'''
if message.structure.get_name() == 'level':
# stick with left channel in stereo setups
peak = message.structure['peak'][0]
self.pbar.set_fraction(self.iec_scale(peak)/100)
self.pbar.queue_draw()
return True
def iec_scale(self, db):
'''For a given dB value, return the iEC-268-18 standard value'''
pct = 0.0
if db < -70.0:
pct = 0.0
elif db < -60.0:
pct = (db + 70.0) * 0.25
elif db < -50.0:
pct = (db + 60.0) * 0.5 + 2.5
elif db < -40.0:
pct = (db + 50.0) * 0.75 + 7.5
elif db < -30.0:
pct = (db + 40.0) * 1.5 + 15.0
elif db < -20.0:
pct = (db + 30.0) * 2.0 + 30.0
elif db < 0.0:
pct = (db + 20.0) * 2.5 + 50.0
else:
pct = 100.0
return pct
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