path: root/voctocore/experiments/videodisplay.py

#!/usr/bin/python3
from gi.repository import GObject, Gst

class VideomixerWithDisplay(Gst.Bin):
    def __init__(self):
        super().__init__()

        # Create elements
        self.secondsrc = Gst.ElementFactory.make('videotestsrc', None)
        self.mixer = Gst.ElementFactory.make('compositor', None)
        self.ident = Gst.ElementFactory.make('identity', None)
        self.q1 = Gst.ElementFactory.make('queue', None)
        self.q2 = Gst.ElementFactory.make('queue', None)
        self.display = Gst.ElementFactory.make('ximagesink', None)

        # Add elements to Bin
        self.add(self.secondsrc)
        self.add(self.mixer)
        self.add(self.ident)
        self.add(self.display)
        self.add(self.q1)
        self.add(self.q2)

        # Set properties
        self.secondsrc.set_property('pattern', 'ball')
        self.ident.set_property('sync', True)
        self.display.set_property('sync', False)

        # Request Pads
        self.firstpad = self.mixer.get_request_pad('sink_%u')
        self.secondpad = self.mixer.get_request_pad('sink_%u')

        # Set pad-properties
        self.secondpad.set_property('alpha', 0.75)
        self.secondpad.set_property('xpos', 50)
        self.secondpad.set_property('ypos', 50)

        # Link elements
        self.q1.get_static_pad('src').link(self.firstpad)

        self.q2.get_static_pad('src').link(self.secondpad)
        self.secondsrc.link_filtered(self.ident, Gst.Caps.from_string('video/x-raw,width=400,height=400,framerate=25/1,format=RGBx'))
        self.ident.link(self.q2)

        self.mixer.link(self.display)

        # Add Ghost Pads
        self.add_pad(
            Gst.GhostPad.new('sink', self.q1.get_static_pad('sink'))
        )