import sys, os
import pygtk, gtk, gobject
import pygst
pygst.require("0.10")
import gst

def playIntro():
    GTK_Main()
    gtk.gdk.threads_init()
    gtk.main()

class GTK_Main:
    
    def __init__(self):
        
        self.window = gtk.Window(gtk.WINDOW_TOPLEVEL)
        
        self.window.set_default_size(1200, 900)
        
        self.window.show_all()
        self.window.fullscreen()
        self.window.realize()
        
        self.window.connect("destroy", gtk.main_quit, "WM destroy")
        self.window.connect("key_press_event", self.OnKeyPress)
        self.window.connect("event_after", self.OnEventAfter)
        
        self.player = gst.Pipeline("player")
        source = gst.element_factory_make("filesrc", "file-source")
        demuxer = gst.element_factory_make("oggdemux", "demuxer")
        demuxer.connect("pad-added", self.demuxer_callback)
        self.video_decoder = gst.element_factory_make("theoradec", "video-decoder")
        self.audio_decoder = gst.element_factory_make("vorbisdec", "audio-decoder")
        audioconv = gst.element_factory_make("audioconvert", "converter")
        audiosink = gst.element_factory_make("autoaudiosink", "audio-output")
        videosink = gst.element_factory_make("autovideosink", "video-output")
        self.queuea = gst.element_factory_make("queue", "queuea")
        self.queuev = gst.element_factory_make("queue", "queuev")
        colorspace = gst.element_factory_make("ffmpegcolorspace", "colorspace")
        
        self.player.add(source, demuxer, self.video_decoder, self.audio_decoder, audioconv,
            audiosink, videosink, self.queuea, self.queuev, colorspace)
        gst.element_link_many(source, demuxer)

        gst.element_link_many(self.queuev, self.video_decoder, colorspace, videosink)
        gst.element_link_many(self.queuea, self.audio_decoder, audioconv, audiosink)

        bus = self.player.get_bus()
        bus.add_signal_watch()
        bus.enable_sync_message_emission()
        bus.connect("message", self.on_message)
        bus.connect("sync-message::element", self.on_sync_message)

    def play(self):
        #filepath = "/home/olpc/gstests/auvid.ogv"
        curdir = os.path.abspath(os.path.curdir)
        filepath = os.path.join(curdir, "resources")
        filepath = os.path.join(filepath, "intro.ogv")
        if os.path.isfile(filepath):
            self.player.get_by_name("file-source").set_property("location", filepath)
        self.player.set_state(gst.STATE_PLAYING)
    

    def stop(self):
        self.player.set_state(gst.STATE_NULL)
        #gtk.main_quit()
        self.window.destroy()
    def on_stop(self, w):
        self.stop()
                        
    def on_message(self, bus, message):
        t = message.type
        if t == gst.MESSAGE_EOS:
            self.stop()
        elif t == gst.MESSAGE_ERROR:
            err, debug = message.parse_error()
            print "Error: %s" % err, debug
            self.stop()
    
    def on_sync_message(self, bus, message):
        if message.structure is None:
            return
        message_name = message.structure.get_name()
        if message_name == "prepare-xwindow-id":
            imagesink = message.src
            imagesink.set_property("force-aspect-ratio", True)
            imagesink.set_xwindow_id(self.window.window.xid)
    
    def demuxer_callback(self, demuxer, pad):
        caps = pad.get_caps()
    
        if str(caps) == "video/x-theora":
            qv_pad = self.queuev.get_pad("sink")
            pad.link(qv_pad)
        elif str(caps) == "audio/x-vorbis":
            qa_pad = self.queuea.get_pad("sink")
            pad.link(qa_pad)

    def OnEventAfter(self, widget, event):
        if event.type.value_name == "GDK_FOCUS_CHANGE":
            self.play()

    def OnKeyPress(self, widget, event):
        self.stop()