Wxpython and GST based webcam viewer

Fork @ https://gist.github.com/6111868f00736fd4575c#

#!/usr/bin/env python
# Wxpython Port of Example 8.1 http://pygstdocs.berlios.de/pygst-tutorial/webcam-viewer.html


import wx
import gst


import gobject
gobject.threads_init()




class WxWebCamTest(wx.Frame):
	def __init__(self, parent, ID, title):


		wx.Frame.__init__(self, parent, ID, title)
		self.SetSize((500, 400))
		self.Bind(wx.EVT_CLOSE,self.destroy)
		vbox = wx.BoxSizer(wx.VERTICAL)
		hbox = wx.BoxSizer(wx.HORIZONTAL)


		self.button = wx.Button(self,label="Start")
		hbox.Add(self.button, 0, wx.ALL|wx.ALIGN_CENTER_VERTICAL, 4)
		self.button.Bind(wx.EVT_BUTTON, self.start_stop)


		vbox.Add(hbox, 0, wx.EXPAND, 0)
		self.movie_window = wx.Panel(self)
		vbox.Add(self.movie_window,1,wx.ALL|wx.EXPAND,4)
		self.SetSizer(vbox)
		self.Layout()
		self.Show()


		self.player = gst.parse_launch ("v4l2src ! autovideosink")
		bus = self.player.get_bus()
		print 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 start_stop(self, event):
		if self.button.GetLabel() == "Start":
			self.button.SetLabel("Stop")
			self.player.set_state(gst.STATE_PLAYING)
		else:
			self.player.set_state(gst.STATE_NULL)
			self.button.SetLabel("Start")


	def on_message(self, bus, message):
		t = message.type
		if t == gst.MESSAGE_EOS:
			self.player.set_state(gst.STATE_NULL)
			self.button.SetLabel("Start")
		elif t == gst.MESSAGE_ERROR:
			self.player.set_state(gst.STATE_NULL)
			self.button.SetLabel("Start")
			print "Error: ", message.parse_error()


	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.movie_window.GetHandle())


	def destroy(self,event):
		#Stop the player pipeline to prevent a X Window System error
		self.player.set_state(gst.STATE_NULL)
		event.Skip()


if __name__=="__main__":
	app = wx.App()
	f = WxWebCamTest(None, -1, "Video Test 1")
	f.Centre()
	f.Show(True)
	app.MainLoop()

By- Narendra Sisodiya