mirror of
https://gitlab.freedesktop.org/gstreamer/gstreamer.git
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91 lines
2.2 KiB
Python
91 lines
2.2 KiB
Python
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#!/usr/bin/env python3
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'''
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Simple example to demonstrate dynamically adding and removing source elements
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to a playing pipeline.
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'''
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import sys
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import random
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import gi
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gi.require_version('Gst', '1.0')
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gi.require_version('GLib', '2.0')
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gi.require_version('GObject', '2.0')
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from gi.repository import GLib, GObject, Gst
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class ProbeData:
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def __init__(self, pipe, src):
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self.pipe = pipe
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self.src = src
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def bus_call(bus, message, loop):
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t = message.type
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if t == Gst.MessageType.EOS:
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sys.stdout.write("End-of-stream\n")
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loop.quit()
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elif t == Gst.MessageType.ERROR:
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err, debug = message.parse_error()
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sys.stderr.write("Error: %s: %s\n" % (err, debug))
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loop.quit()
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return True
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def dispose_src_cb(src):
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src.set_state(Gst.State.NULL)
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def probe_cb(pad, info, pdata):
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peer = pad.get_peer()
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pad.unlink(peer)
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pdata.pipe.remove(pdata.src)
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# Can't set the state of the src to NULL from its streaming thread
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GLib.idle_add(dispose_src_cb, pdata.src)
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pdata.src = Gst.ElementFactory.make('videotestsrc')
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pdata.src.props.pattern = random.randint(0, 24)
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pdata.pipe.add(pdata.src)
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srcpad = pdata.src.get_static_pad ("src")
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srcpad.link(peer)
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pdata.src.sync_state_with_parent()
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GLib.timeout_add_seconds(1, timeout_cb, pdata)
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return Gst.PadProbeReturn.REMOVE
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def timeout_cb(pdata):
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srcpad = pdata.src.get_static_pad('src')
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srcpad.add_probe(Gst.PadProbeType.IDLE, probe_cb, pdata)
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return GLib.SOURCE_REMOVE
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def main(args):
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GObject.threads_init()
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Gst.init(None)
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pipe = Gst.Pipeline.new('dynamic')
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src = Gst.ElementFactory.make('videotestsrc')
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sink = Gst.ElementFactory.make('autovideosink')
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pipe.add(src, sink)
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src.link(sink)
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pdata = ProbeData(pipe, src)
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loop = GObject.MainLoop()
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GLib.timeout_add_seconds(1, timeout_cb, pdata)
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bus = pipe.get_bus()
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bus.add_signal_watch()
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bus.connect ("message", bus_call, loop)
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# start play back and listen to events
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pipe.set_state(Gst.State.PLAYING)
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try:
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loop.run()
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except:
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pass
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# cleanup
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pipe.set_state(Gst.State.NULL)
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if __name__ == '__main__':
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sys.exit(main(sys.argv))
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