mirror of
https://gitlab.freedesktop.org/gstreamer/gstreamer.git
synced 2024-11-24 18:51:11 +00:00
80 lines
2.4 KiB
Python
80 lines
2.4 KiB
Python
#!/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()
|