cairooverlay

#!/usr/bin/python

import pygst
pygst.require("0.10")
import gst
import pygtk
import gtk
import gtk.glade
import cairo

class Main:
    def __init__(self):

        # Create gui bits and bobs

        self.wTree = gtk.glade.XML("gui.glade", "mainwindow")

        signals = {
            "on_play_clicked" : self.OnPlay,
            "on_stop_clicked" : self.OnStop,
            "on_quit_clicked" : self.OnQuit,
        }

        self.wTree.signal_autoconnect(signals)

        # Create GStreamer bits and bobs
        self.pipeline = gst.Pipeline("mypipeline")

        self.videotestsrc = gst.element_factory_make("videotestsrc", "source")
        self.pipeline.add(self.videotestsrc)

        self.adaptor1 = gst.element_factory_make("ffmpegcolorspace", "adaptor1");
        self.pipeline.add(self.adaptor1)

        self.cairooverlay = gst.element_factory_make("cairooverlay")
        self.cairooverlay.connect("draw", self.OnDraw)
        self.pipeline.add(self.cairooverlay)

        self.adaptor2 = gst.element_factory_make("ffmpegcolorspace", "adaptor2");
        self.pipeline.add(self.adaptor2)

        self.sink = gst.element_factory_make("autovideosink")
        self.pipeline.add(self.sink)

        self.videotestsrc.link(self.adaptor1)
        self.adaptor1.link(self.cairooverlay)
        self.cairooverlay.link(self.adaptor2)
        self.adaptor2.link(self.sink)

        self.window = self.wTree.get_widget("mainwindow")
        self.window.show_all()

    def OnPlay(self, widget):
        print "play"
        self.pipeline.set_state(gst.STATE_PLAYING)

    def OnStop(self, widget):
        print "stop"
        self.pipeline.set_state(gst.STATE_READY)

    def OnQuit(self, widget):
        gtk.main_quit()

    def OnDraw(this, overlay, cr, timestamp, duration): # one argument ommited

        # draw text
        #cr.select_font_face('Sans')
        #cr.set_font_size(60) # em-square height is 90 pixels
        #cr.move_to(10, 90) # move to point (x, y) = (10, 90)
        #cr.set_source_rgb(1.00, 0.83, 0.00) # yellow
        cr.show_text('Hello World')

        # finish up
        cr.stroke() # commit to surface

start=Main()
gtk.main()