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Development Team/Almanac/GStreamer (view source)
Revision as of 17:10, 2 October 2008
, 17:10, 2 October 2008→How can I play back video files in my activity?
=== How can I play back video files in my activity? ===
=== How can I play back video files in my activity? ===
Sugar, by default, can play back audio (encoded in Vorbis) and video (encoded in Theora) files in ogg containers.
Sugar, by default, can play back audio (encoded in Vorbis) and video (encoded in Theora) files in ogg containers.
The following file will be helpful for embedding video or audio files into your activity. After the code posting is a code snippet showing how to use this.
<pre>
import gtk
import pygtk
pygtk.require('2.0')
import sys
import pygst
pygst.require('0.10')
import gst
import gst.interfaces
import gobject
import time
gobject.threads_init()
class Gplay:
def __init__(self):
self.window = None
self.playing = False
self.player = gst.element_factory_make("playbin", "playbin")
xis = gst.element_factory_make("xvimagesink", "xvimagesink")
self.player.set_property("video-sink", xis)
bus = self.player.get_bus()
bus.enable_sync_message_emission()
bus.add_signal_watch()
self.SYNC_ID = bus.connect('sync-message::element', self._onSyncMessageCb)
def _onSyncMessageCb(self, bus, message):
if message.structure is None:
return True
if message.structure.get_name() == 'prepare-xwindow-id':
self.window.set_sink(message.src)
message.src.set_property('force-aspect-ratio', True)
return True
def setFile(self, path):
uri = "file://" + str( path )
if (self.player.get_property('uri') == uri):
self.seek(gst.SECOND*0)
return
self.player.set_state(gst.STATE_READY)
self.player.set_property('uri', uri)
ext = uri[len(uri)-3:]
if (ext == "jpg"):
self.pause()
else:
self.play()
def queryPosition(self):
#"Returns a (position, duration) tuple"
try:
position, format = self.player.query_position(gst.FORMAT_TIME)
except:
position = gst.CLOCK_TIME_NONE
try:
duration, format = self.player.query_duration(gst.FORMAT_TIME)
except:
duration = gst.CLOCK_TIME_NONE
return (position, duration)
def seek(self, time):
event = gst.event_new_seek(1.0, gst.FORMAT_TIME, gst.SEEK_FLAG_FLUSH | gst.SEEK_FLAG_ACCURATE, gst.SEEK_TYPE_SET, time, gst.SEEK_TYPE_NONE, 0)
res = self.player.send_event(event)
if res:
self.player.set_new_stream_time(0L)
def pause(self):
self.playing = False
self.player.set_state(gst.STATE_PAUSED)
def play(self):
self.playing = True
self.player.set_state(gst.STATE_PLAYING)
def stop(self):
self.playing = False
self.player.set_state(gst.STATE_NULL)
self.nextMovie()
def get_state(self, timeout=1):
return self.player.get_state(timeout=timeout)
def is_playing(self):
return self.playing
class PlayVideoWindow(gtk.Window):
def __init__(self):
gtk.Window.__init__(self)
self.imagesink = None
self.unset_flags(gtk.DOUBLE_BUFFERED)
self.set_flags(gtk.APP_PAINTABLE)
def set_sink(self, sink):
if (self.imagesink != None):
assert self.window.xid
self.imagesink = None
del self.imagesink
self.imagesink = sink
self.imagesink.set_xwindow_id(self.window.xid)
</pre>
And here is a code snippet showing how you would use this file to embed media playback in your activity:
<pre>
#this is our video playback window
self.gplay = Gplay( )
self.gplayWin = PlayVideoWindow( )
self.gplay.window = self.gplayWin
self.gplayWin.set_type_hint( gtk.gdk.WINDOW_TYPE_HINT_DIALOG )
self.gplayWin.set_decorated( False )
self.gplayWin.set_transient_for( self ) #activity subclass
self.gplayWin.move( 100, 100 )
self.gplayWin.resize( 300, 400 )
self.gplayWin.show_all( )
</pre>