gst-plugins-rs/video/gtk4/examples/gtksink.py

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import gi
import sys
gi.require_version('GLib', '2.0')
from gi.repository import GLib
gi.require_version('Gtk', '4.0')
from gi.repository import Gtk
gi.require_version('Gst', '1.0')
from gi.repository import Gst
def on_activate(app):
pipeline = Gst.Pipeline.new()
overlay = Gst.ElementFactory.make('clockoverlay', None)
overlay.set_property('font-desc', 'Monospace 42')
gtksink = Gst.ElementFactory.make('gtk4paintablesink', None)
paintable = gtksink.get_property('paintable')
if paintable.props.gl_context:
print('Using GL')
src = Gst.ElementFactory.make('gltestsrc', None)
sink = Gst.ElementFactory.make('glsinkbin', None)
sink.set_property('sink', gtksink)
else:
print('Not using GL')
src = Gst.ElementFactory.make('videotestsrc', None)
sink = Gst.Bin.new()
convert = Gst.ElementFactory.make('videoconvert', None)
sink.add(convert)
sink.add(gtksink)
convert.link(gtksink)
sink.add_pad(Gst.GhostPad.new('sink', convert.get_static_pad('sink')))
pipeline.add(src)
pipeline.add(overlay)
pipeline.add(sink)
src.link_filtered(overlay, Gst.Caps.from_string('video/x-raw(ANY), width=640, height=480'))
overlay.link(sink)
window = Gtk.ApplicationWindow(application=app)
window.set_default_size(640, 480)
vbox = Gtk.Box(orientation=Gtk.Orientation.VERTICAL)
picture = Gtk.Picture.new()
picture.set_paintable(paintable)
vbox.append(picture)
label = Gtk.Label.new('Position: 00:00:00')
vbox.append(label)
window.set_child(vbox)
window.present()
app.add_window(window)
def on_timeout():
(res, position) = pipeline.query_position(Gst.Format.TIME)
if not res or position == -1:
label.set_text('Position: 00:00:00')
else:
seconds = int(position / 1000000000)
minutes = int(seconds / 60)
hours = int(minutes / 60)
seconds = seconds % 60
minutes = minutes % 60
label.set_text(f'Position: {hours:02}:{minutes:02}:{seconds:02}')
return True
GLib.timeout_add(500, on_timeout)
pipeline.set_state(Gst.State.PLAYING)
def on_bus_msg(_, msg):
match msg.type:
case Gst.MessageType.EOS:
app.quit()
case Gst.MessageType.ERROR:
(err, _) = msg.parse_error()
print(f'Error from {msg.src.path_string()}: {err}')
app.quit()
return True
bus = pipeline.get_bus()
bus.add_watch(GLib.PRIORITY_DEFAULT, on_bus_msg)
def on_close(_):
window.close()
pipeline.set_state(Gst.State.NULL)
app.connect('shutdown', on_close)
if __name__ == '__main__':
Gst.init(None)
app = Gtk.Application()
app.connect('activate', on_activate)
res = app.run(None)
sys.exit(res)