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https://gitlab.freedesktop.org/gstreamer/gstreamer.git
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80 lines
2.5 KiB
Python
80 lines
2.5 KiB
Python
#!/usr/bin/env python
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# -*- Mode: Python -*-
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# vi:si:et:sw=4:sts=4:ts=4
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# gst-python
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# Copyright (C) 2005 Thomas Vander Stichele
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#
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# This library is free software; you can redistribute it and/or
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# modify it under the terms of the GNU Library General Public
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# License as published by the Free Software Foundation; either
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# version 2 of the License, or (at your option) any later version.
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#
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# This library is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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# Library General Public License for more details.
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#
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# You should have received a copy of the GNU Library General Public
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# License along with this library; if not, write to the
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# Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
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# Boston, MA 02110-1301, USA.
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import gst
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import time
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import gobject
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#gobject.threads_init() # so we can safely receive signals from threads
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count = 0
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def on_message_application(cutter, message, loop):
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global count
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s = message.structure
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which = 'below'
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if s['above']: which = 'above'
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print "%s: %s threshold" % (gst.TIME_ARGS(s['timestamp']), which)
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if s['above']: count += 1
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if count > 2: loop.quit()
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def main():
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type = 'async'
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loop = gobject.MainLoop()
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pipeline = gst.Pipeline("cutter")
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src = gst.element_factory_make("sinesrc", "src")
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cutter = gst.element_factory_make("cutter")
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cutter.set_property('threshold', 0.5)
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sink = gst.element_factory_make("fakesink", "sink")
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pipeline.add(src, cutter, sink)
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src.link(cutter)
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cutter.link(sink)
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control = gst.Controller(src, "volume")
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control.set_interpolation_mode("volume", gst.INTERPOLATE_LINEAR)
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control.set("volume", 0, 0.0)
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control.set("volume", 2 * gst.SECOND, 1.0)
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control.set("volume", 4 * gst.SECOND, 0.0)
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control.set("volume", 6 * gst.SECOND, 1.0)
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control.set("volume", 8 * gst.SECOND, 0.0)
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control.set("volume", 10 * gst.SECOND, 1.0)
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bus = pipeline.get_bus()
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if type == 'async':
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bus.add_signal_watch()
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bus.connect('message::element', on_message_application, loop)
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else:
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# FIXME: needs wrapping in gst-python
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bus.set_sync_handler(bus.sync_signal_handler)
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bus.connect('sync-message::element', on_message_application, loop)
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pipeline.set_state(gst.STATE_PLAYING)
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loop.run()
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pipeline.set_state(gst.STATE_NULL)
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if __name__ == "__main__":
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main()
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