Created
April 18, 2020 05:52
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Simple example to demonstrate dynamically adding and removing source elements to a playing pipeline.
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#!/usr/bin/env python3 | |
''' https://github.com/GStreamer/gst-python/blob/master/examples/dynamic_src.py | |
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) | |
pipe.add(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)) |
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