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"""Video widget for displaying a gstreamer pipe"""
import logging
log = logging.getLogger( 'olpcgames.video' )
import os
import signal
import pygtk
pygtk.require('2.0')
import gtk
import gst
class VideoWidget(gtk.DrawingArea):
"""A custom widget to render GStreamer video."""
def __init__(self, x=160, y=120):
super(VideoWidget, self).__init__()
self._imagesink = None
self.unset_flags(gtk.DOUBLE_BUFFERED)
self.set_size_request(x,y)
def do_expose_event(self, event):
if self._imagesink:
self._imagesink.expose()
return False
else:
return True
def set_sink(self, sink):
assert self.window.xid
self._imagesink = sink
self._imagesink.set_xwindow_id(self.window.xid)
#pipe_desc = 'v4l2src ! video/x-raw-yuv,width=160,height=120 ! ffmpegcolorspace ! xvimagesink'
pipe_desc = 'v4l2src ! ffmpegcolorspace ! video/x-raw-yuv ! xvimagesink'
class Player(object):
def __init__(self, videowidget):
self._playing = False
self._videowidget = videowidget
self._pipeline = gst.parse_launch(pipe_desc)
bus = self._pipeline.get_bus()
bus.enable_sync_message_emission()
bus.add_signal_watch()
bus.connect('sync-message::element', self.on_sync_message)
bus.connect('message', self.on_message)
def play(self):
if self._playing == False:
self._pipeline.set_state(gst.STATE_PLAYING)
self._playing = True
def pause(self):
if self._playing == True:
self._pipeline.set_state(gst.STATE_PAUSED)
self._playing = False
def on_sync_message(self, bus, message):
if message.structure is None:
return
if message.structure.get_name() == 'prepare-xwindow-id':
self._videowidget.set_sink(message.src)
def on_message(self, bus, message):
t = message.type
if t == gst.MESSAGE_ERROR:
err, debug = message.parse_error()
log.debug("Video error: (%s) %s" ,err, debug)
self._playing = False
gtk.main_quit()
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