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
|
#!/usr/bin/env python
# -*- Mode: Python -*-
# vi:si:et:sw=4:sts=4:ts=4
# gst-python
# Copyright (C) 2005 Thomas Vander Stichele
#
# 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.
import gst
import time
import gobject
#gobject.threads_init() # so we can safely receive signals from threads
count = 0
def on_message_application(cutter, message, loop):
global count
s = message.structure
which = 'below'
if s['above']: which = 'above'
print "%s: %s threshold" % (gst.TIME_ARGS(s['timestamp']), which)
if s['above']: count += 1
if count > 2: loop.quit()
def main():
type = 'async'
loop = gobject.MainLoop()
pipeline = gst.Pipeline("cutter")
src = gst.element_factory_make("sinesrc", "src")
cutter = gst.element_factory_make("cutter")
cutter.set_property('threshold', 0.5)
sink = gst.element_factory_make("fakesink", "sink")
pipeline.add(src, cutter, sink)
src.link(cutter)
cutter.link(sink)
control = gst.Controller(src, "volume")
control.set_interpolation_mode("volume", gst.INTERPOLATE_LINEAR)
control.set("volume", 0, 0.0)
control.set("volume", 2 * gst.SECOND, 1.0)
control.set("volume", 4 * gst.SECOND, 0.0)
control.set("volume", 6 * gst.SECOND, 1.0)
control.set("volume", 8 * gst.SECOND, 0.0)
control.set("volume", 10 * gst.SECOND, 1.0)
bus = pipeline.get_bus()
if type == 'async':
bus.add_signal_watch()
bus.connect('message::element', on_message_application, loop)
else:
# FIXME: needs wrapping in gst-python
bus.set_sync_handler(bus.sync_signal_handler)
bus.connect('sync-message::element', on_message_application, loop)
pipeline.set_state(gst.STATE_PLAYING)
loop.run()
pipeline.set_state(gst.STATE_NULL)
if __name__ == "__main__":
main()
|
