1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
|
#!/usr/bin/env python
# -*- Mode: Python -*-
# vi:si:et:sw=4:sts=4:ts=4
# gst-python
# Copyright (C) 2005 Andy Wingo <wingo@pobox.com>
#
# This library is free software; you can redistribute it and/or
# modify it under the terms of the GNU Library General Public
# License as published by the Free Software Foundation; either
# version 2 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
# Library General Public License for more details.
#
# You should have received a copy of the GNU Library General Public
# License along with this library; if not, write to the
# Free Software Foundation, Inc., 59 Temple Place - Suite 330,
# Boston, MA 02111-1307, USA.
# A test more of gst-plugins than of gst-python.
import pygtk
pygtk.require('2.0')
import gtk
import gobject
import pygst
pygst.require('0.10')
import gst
import fvumeter
def clamp(x, min, max):
if x < min:
return min
elif x > max:
return max
return x
class Window(gtk.Dialog):
def __init__(self):
gtk.Dialog.__init__(self, 'Volume Level')
self.prepare_ui()
def prepare_ui(self):
self.set_default_size(200,60)
self.set_title('Volume Level')
self.connect('delete-event', lambda *x: gtk.main_quit())
self.vus = []
self.vus.append(fvumeter.FVUMeter())
self.vus.append(fvumeter.FVUMeter())
self.vbox.add(self.vus[0])
self.vbox.add(self.vus[1])
self.vus[0].show()
self.vus[1].show()
def error(self, message, secondary=None):
m = gtk.MessageDialog(self,
gtk.DIALOG_MODAL | gtk.DIALOG_DESTROY_WITH_PARENT,
gtk.MESSAGE_ERROR,
gtk.BUTTONS_OK,
message)
if secondary:
m.format_secondary_text(secondary)
m.run()
def on_message(self, bus, message):
if message.structure.get_name() == 'level':
s = message.structure
for i in range(0, len(s['peak'])):
self.vus[i].freeze_notify()
decay = clamp(s['decay'][i], -90.0, 0.0)
peak = clamp(s['peak'][i], -90.0, 0.0)
if peak > decay:
print "ERROR: peak bigger than decay!"
self.vus[i].set_property('decay', decay)
self.vus[i].set_property('peak', peak)
return True
def run(self):
try:
self.set_sensitive(False)
s = 'alsasrc ! level message=true ! fakesink'
pipeline = gst.parse_launch(s)
self.set_sensitive(True)
pipeline.get_bus().add_signal_watch()
i = pipeline.get_bus().connect('message::element', self.on_message)
pipeline.set_state(gst.STATE_PLAYING)
gtk.Dialog.run(self)
pipeline.get_bus().disconnect(i)
pipeline.get_bus().remove_signal_watch()
pipeline.set_state(gst.STATE_NULL)
except gobject.GError, e:
self.set_sensitive(True)
self.error('Could not create pipeline', e.__str__)
if __name__ == '__main__':
w = Window()
w.show_all()
w.run()
|
