mirror of
https://gitlab.freedesktop.org/gstreamer/gstreamer.git
synced 2024-11-14 13:21:28 +00:00
90 lines
2.2 KiB
Python
90 lines
2.2 KiB
Python
#!/usr/bin/env python3
|
|
|
|
'''
|
|
Simple example to demonstrate dynamically adding and removing source elements
|
|
to a playing pipeline.
|
|
'''
|
|
|
|
import sys
|
|
import random
|
|
|
|
import gi
|
|
gi.require_version('Gst', '1.0')
|
|
gi.require_version('GLib', '2.0')
|
|
gi.require_version('GObject', '2.0')
|
|
from gi.repository import GLib, GObject, Gst
|
|
|
|
class ProbeData:
|
|
def __init__(self, pipe, src):
|
|
self.pipe = pipe
|
|
self.src = src
|
|
|
|
def bus_call(bus, message, loop):
|
|
t = message.type
|
|
if t == Gst.MessageType.EOS:
|
|
sys.stdout.write("End-of-stream\n")
|
|
loop.quit()
|
|
elif t == Gst.MessageType.ERROR:
|
|
err, debug = message.parse_error()
|
|
sys.stderr.write("Error: %s: %s\n" % (err, debug))
|
|
loop.quit()
|
|
return True
|
|
|
|
def dispose_src_cb(src):
|
|
src.set_state(Gst.State.NULL)
|
|
|
|
def probe_cb(pad, info, pdata):
|
|
peer = pad.get_peer()
|
|
pad.unlink(peer)
|
|
pdata.pipe.remove(pdata.src)
|
|
# Can't set the state of the src to NULL from its streaming thread
|
|
GLib.idle_add(dispose_src_cb, pdata.src)
|
|
|
|
pdata.src = Gst.ElementFactory.make('videotestsrc')
|
|
pdata.src.props.pattern = random.randint(0, 24)
|
|
pdata.pipe.add(pdata.src)
|
|
srcpad = pdata.src.get_static_pad ("src")
|
|
srcpad.link(peer)
|
|
pdata.src.sync_state_with_parent()
|
|
|
|
GLib.timeout_add_seconds(1, timeout_cb, pdata)
|
|
|
|
return Gst.PadProbeReturn.REMOVE
|
|
|
|
def timeout_cb(pdata):
|
|
srcpad = pdata.src.get_static_pad('src')
|
|
srcpad.add_probe(Gst.PadProbeType.IDLE, probe_cb, pdata)
|
|
return GLib.SOURCE_REMOVE
|
|
|
|
def main(args):
|
|
GObject.threads_init()
|
|
Gst.init(None)
|
|
|
|
pipe = Gst.Pipeline.new('dynamic')
|
|
src = Gst.ElementFactory.make('videotestsrc')
|
|
sink = Gst.ElementFactory.make('autovideosink')
|
|
pipe.add(src, sink)
|
|
src.link(sink)
|
|
|
|
pdata = ProbeData(pipe, src)
|
|
|
|
loop = GObject.MainLoop()
|
|
|
|
GLib.timeout_add_seconds(1, timeout_cb, pdata)
|
|
|
|
bus = pipe.get_bus()
|
|
bus.add_signal_watch()
|
|
bus.connect ("message", bus_call, loop)
|
|
|
|
# start play back and listen to events
|
|
pipe.set_state(Gst.State.PLAYING)
|
|
try:
|
|
loop.run()
|
|
except:
|
|
pass
|
|
|
|
# cleanup
|
|
pipe.set_state(Gst.State.NULL)
|
|
|
|
if __name__ == '__main__':
|
|
sys.exit(main(sys.argv))
|