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~robol/gits/ » RaiTV : Blob 51b82f / RaiTV / VideoWidget.py
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  1. #
  2. # -*- coding: utf-8 -*-
  3. #
  4. # Implementazione del Widget per gestire il video
  5. #
  6.  
  7. import pygtk, gtk, gst, cairo, threading, time
  8.  
  9. class GstPlayer(threading.Thread):
  10.  
  11.     def __init__(self, xid, video):
  12.         threading.Thread.__init__(self)
  13.         self.xid = xid
  14.         self.video = video
  15.  
  16.         self.exit_required = False
  17.         self.loading = False
  18.  
  19.     def set_sink(self, sink):
  20.         assert self.xid
  21.         self.imagesink = sink
  22.         self.imagesink.set_xwindow_id(self.xid)
  23.  
  24.     def on_sync_message(self, bus, message):
  25.  
  26.         if message.structure is None:
  27.             return
  28.         if message.structure.get_name() == 'prepare-xwindow-id':
  29.             gtk.gdk.threads_enter()
  30.  
  31.             self.set_sink(message.src)
  32.             message.src.set_property("force-aspect-ratio", True)
  33.             gtk.gdk.threads_leave()
  34.  
  35.     def on_message(self, bus, message):
  36.         if message.type == gst.MESSAGE_ERROR:
  37.             err, debug = message.parse_error()
  38.             print err, debug
  39.  
  40.     def is_loading(self):
  41.         return self.loading
  42.  
  43.     def run(self):
  44.         self.player = gst.element_factory_make("playbin", "player")
  45.  
  46.         self.player.set_property
  47.         bus = self.player.get_bus()
  48.         bus.enable_sync_message_emission()
  49.         bus.add_signal_watch()
  50.         bus.connect("sync-message::element", self.on_sync_message)
  51.         bus.connect("message", self.on_message)
  52.  
  53.         self.loading = True
  54.         self.player.set_property("uri", self.video)
  55.  
  56.         self.player.set_state(gst.STATE_PLAYING)
  57.         self.loading = False
  58.         while not self.exit_required:
  59.             pass
  60.  
  61.         self.player.set_state(gst.STATE_NULL)
  62.  
  63.     def exit(self):
  64.         self.exit_required = True
  65.  
  66.     def pause(self):
  67.         self.player.set_state(gst.STATE_PAUSED)
  68.  
  69.     def play(self):
  70.         self.player.set_state(gst.STATE_PLAYING)
  71.  
  72.  
  73. class VideoWidget(gtk.DrawingArea):
  74.  
  75.     def __init__(self):
  76.  
  77.         ## Creo la drawing area e la coloro
  78.         ## di nero
  79.         gtk.DrawingArea.__init__(self)
  80.  
  81.         self.set_size_request(240,240)
  82.         self.unset_flags(gtk.DOUBLE_BUFFERED)
  83.  
  84.         ## Connetto l'expose-event
  85.         self.connect("expose-event", self.colorize)
  86.  
  87.         self.playing = False
  88.         self.player = None
  89.  
  90.  
  91.     def colorize(self, widget, event):
  92.         """Quando la finestra viene creata la coloriamo di
  93.         nero. Poi sarà tutto lavoro per gstreamer"""
  94.  
  95.         ## Ci permettiamo di disegnare sopra il filmato
  96.         ## se e solo se non c'è un filmato che sta andando! :)
  97.  
  98.         if not self.playing:
  99.             cr = self.window.cairo_create()
  100.             ## Non facciamo lavoro extra e coloriamo solo ciò
  101.             ## che è stato scoperto
  102.             cr.rectangle(event.area.x, event.area.y,
  103.                          event.area.width, event.area.height)
  104.  
  105.             cr.clip()
  106.  
  107.             width, height = self.window.get_size()
  108.  
  109.             cr.set_source_rgb(0,0,0)
  110.             cr.rectangle(0,0,width,height)
  111.             cr.fill()
  112.  
  113.             cr.set_source_rgb(0.5,0,0)
  114.             st = "RaiTV :)"
  115.             cr.set_font_size(height/20)
  116.             cr.select_font_face("Comic Sans MS")
  117.             xbearing , ybearing, twidth, theight, xadvance, yadvance = cr.text_extents(st)
  118.  
  119.             cr.move_to(width/2 - twidth/2, 1.6*height/3 - theight/5)
  120.             cr.show_text(st)
  121.  
  122.             cr.set_line_width(3)
  123.             cr.move_to(width/2 - twidth/2 - 5 , 1.6* height/3)
  124.             cr.rel_line_to(twidth + 10,0)
  125.             cr.stroke()
  126.  
  127.  
  128.     def load_video(self, uri):
  129.         """Start video playing with the specified URI"""
  130.         ## Stoppiamo ogni video
  131.         if self.playing:
  132.             self.stop()
  133.  
  134.         print " => Buono, video stoppati"
  135.  
  136.         self.player = GstPlayer(self.window.xid, uri)
  137.         print " => Player creato"
  138.         self.player.start()
  139.         print " => Player avviato"
  140.         self.playing = True
  141.  
  142.         ## Aspettiamo 5 secondi
  143.  
  144.  
  145.  
  146.     def pause(self):
  147.         self.player.pause()
  148.  
  149.     def stop(self):
  150.         self.playing = False
  151.         if self.player is not None:
  152.             self.player.exit()
  153.             self.player.join(timeout=2)
  154.             if self.player.isAlive():
  155.                 print " => Ops, l'ho ucciso brutalmente"
  156.                 del self.player
  157.  
  158.  
  159.     def play(self):
  160.         self.playing = True
  161.         self.player.play()
  162.  
  163.  
  164.     def reset(self):
  165.         pass
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