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play.py
Python
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#!/usr/bin/env python
# Little show-case of GStreamer video on-disk buffering
# based on gst-python/examples/play.py
 
import pygtk
pygtk.require('2.0')
 
import sys
import os
 
import gobject
gobject.threads_init()
 
import pygst
pygst.require('0.10')
import gst
import gst.interfaces
import gtk
gtk.gdk.threads_init()
 
class GstPlayer(gobject.GObject):
__gsignals__ = { 'fill-status-changed': (gobject.SIGNAL_RUN_FIRST,
gobject.TYPE_NONE,
(float,)) }
 
def __init__(self, videowidget):
gobject.GObject.__init__(self)
self.playing = False
self.player = gst.element_factory_make("playbin2", "player")
self.videowidget = videowidget
self.on_eos = False
 
bus = self.player.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)
 
# activate media download
self._temp_location = None
self.started_buffering = False
self.fill_timeout_id = 0
self.player.props.flags |= 0x80
self.player.connect("deep-notify::temp-location", self.on_temp_location)
 
@gobject.property
def download_filename(self):
return self._temp_location
 
def on_sync_message(self, bus, message):
if message.structure is None:
return
if message.structure.get_name() == 'prepare-xwindow-id':
# Sync with the X server before giving the X-id to the sink
gtk.gdk.threads_enter()
gtk.gdk.display_get_default().sync()
self.videowidget.set_sink(message.src)
message.src.set_property('force-aspect-ratio', True)
gtk.gdk.threads_leave()
def on_message(self, bus, message):
t = message.type
if t == gst.MESSAGE_ERROR:
err, debug = message.parse_error()
print "Error: %s" % err, debug
if self.on_eos:
self.on_eos()
self.playing = False
elif t == gst.MESSAGE_EOS:
if self.on_eos:
self.on_eos()
self.playing = False
elif t == gst.MESSAGE_BUFFERING:
self.process_buffering_stats(message)
 
def process_buffering_stats(self, message):
if not self.started_buffering:
self.started_buffering = True
if self.fill_timeout_id:
gobject.source_remove(self.fill_timeout_id)
self.fill_timeout_id = gobject.timeout_add(200,
self.buffering_timeout)
 
def buffering_timeout(self):
query = gst.query_new_buffering(gst.FORMAT_PERCENT)
if self.player.query(query):
fmt, start, stop, total = query.parse_buffering_range()
if stop != -1:
fill_status = stop / 10000.
else:
fill_status = 100.
 
self.emit("fill-status-changed", fill_status)
 
if fill_status == 100.:
# notify::download_filename value
self.notify("download_filename")
return False
return True
 
def on_temp_location(self, playbin, queue, prop):
self._temp_location = queue.props.temp_location
 
def set_location(self, location):
self.player.set_property('uri', location)
 
def query_position(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, location):
"""
@param location: time to seek to, in nanoseconds
"""
gst.debug("seeking to %r" % location)
event = gst.event_new_seek(1.0, gst.FORMAT_TIME,
gst.SEEK_FLAG_FLUSH | gst.SEEK_FLAG_ACCURATE,
gst.SEEK_TYPE_SET, location,
gst.SEEK_TYPE_NONE, 0)
 
res = self.player.send_event(event)
if res:
gst.info("setting new stream time to 0")
self.player.set_new_stream_time(0L)
else:
gst.error("seek to %r failed" % location)
 
def pause(self):
gst.info("pausing player")
self.player.set_state(gst.STATE_PAUSED)
self.playing = False
 
def play(self):
gst.info("playing player")
self.player.set_state(gst.STATE_PLAYING)
self.playing = True
def stop(self):
self.player.set_state(gst.STATE_NULL)
gst.info("stopped player")
if self._temp_location:
try:
os.unlink(self._temp_location)
except OSError:
pass
self._temp_location = ''
 
def get_state(self, timeout=1):
return self.player.get_state(timeout=timeout)
 
def is_playing(self):
return self.playing
class VideoWidget(gtk.DrawingArea):
def __init__(self):
gtk.DrawingArea.__init__(self)
self.imagesink = None
self.unset_flags(gtk.DOUBLE_BUFFERED)
 
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)
 
class PlayerWindow(gtk.Window):
UPDATE_INTERVAL = 500
def __init__(self):
gtk.Window.__init__(self)
self.set_default_size(410, 325)
 
self.create_ui()
 
self.player = GstPlayer(self.videowidget)
self.player.connect("fill-status-changed", self._fill_status_changed)
 
def on_eos():
self.player.seek(0L)
self.play_toggled()
self.player.on_eos = lambda *x: on_eos()
self.update_id = -1
self.changed_id = -1
self.seek_timeout_id = -1
 
self.p_position = gst.CLOCK_TIME_NONE
self.p_duration = gst.CLOCK_TIME_NONE
 
def on_delete_event():
self.player.stop()
gtk.main_quit()
self.connect('delete-event', lambda *x: on_delete_event())
 
def load_file(self, location):
self.player.set_location(location)
def create_ui(self):
vbox = gtk.VBox()
self.add(vbox)
 
self.videowidget = VideoWidget()
vbox.pack_start(self.videowidget)
hbox = gtk.HBox()
vbox.pack_start(hbox, fill=False, expand=False)
self.pause_image = gtk.image_new_from_stock(gtk.STOCK_MEDIA_PAUSE,
gtk.ICON_SIZE_BUTTON)
self.pause_image.show()
self.play_image = gtk.image_new_from_stock(gtk.STOCK_MEDIA_PLAY,
gtk.ICON_SIZE_BUTTON)
self.play_image.show()
self.button = button = gtk.Button()
button.add(self.play_image)
button.set_property('can-default', True)
button.set_focus_on_click(False)
button.show()
hbox.pack_start(button, False)
button.set_property('has-default', True)
button.connect('clicked', lambda *args: self.play_toggled())
self.adjustment = gtk.Adjustment(0.0, 0.00, 100.0, 0.1, 1.0, 1.0)
hscale = gtk.HScale(self.adjustment)
hscale.set_digits(2)
hscale.set_update_policy(gtk.UPDATE_CONTINUOUS)
hscale.connect('button-press-event', self.scale_button_press_cb)
hscale.connect('button-release-event', self.scale_button_release_cb)
hscale.connect('format-value', self.scale_format_value_cb)
hbox.pack_start(hscale)
self.hscale = hscale
 
self.videowidget.connect_after('realize',
lambda *x: self.play_toggled())
 
def play_toggled(self):
self.button.remove(self.button.child)
if self.player.is_playing():
self.player.pause()
self.button.add(self.play_image)
else:
self.player.play()
if self.update_id == -1:
self.update_id = gobject.timeout_add(self.UPDATE_INTERVAL,
self.update_scale_cb)
self.button.add(self.pause_image)
 
def scale_format_value_cb(self, scale, value):
if self.p_duration == -1:
real = 0
else:
real = value * self.p_duration / 100
seconds = real / gst.SECOND
 
return "%02d:%02d" % (seconds / 60, seconds % 60)
 
def scale_button_press_cb(self, widget, event):
# see seek.c:start_seek
gst.debug('starting seek')
self.button.set_sensitive(False)
self.was_playing = self.player.is_playing()
if self.was_playing:
self.player.pause()
 
# don't timeout-update position during seek
if self.update_id != -1:
gobject.source_remove(self.update_id)
self.update_id = -1
 
# make sure we get changed notifies
if self.changed_id == -1:
self.changed_id = self.hscale.connect('value-changed',
self.scale_value_changed_cb)
def scale_value_changed_cb(self, scale):
# see seek.c:seek_cb
real = long(scale.get_value() * self.p_duration / 100) # in ns
gst.debug('value changed, perform seek to %r' % real)
self.player.seek(real)
# allow for a preroll
self.player.get_state(timeout=50*gst.MSECOND) # 50 ms
 
def scale_button_release_cb(self, widget, event):
# see seek.cstop_seek
widget.disconnect(self.changed_id)
self.changed_id = -1
 
self.button.set_sensitive(True)
if self.seek_timeout_id != -1:
gobject.source_remove(self.seek_timeout_id)
self.seek_timeout_id = -1
else:
gst.debug('released slider, setting back to playing')
if self.was_playing:
self.player.play()
 
if self.update_id != -1:
self.error('Had a previous update timeout id')
else:
self.update_id = gobject.timeout_add(self.UPDATE_INTERVAL,
self.update_scale_cb)
 
def update_scale_cb(self):
self.p_position, self.p_duration = self.player.query_position()
if self.p_position != gst.CLOCK_TIME_NONE:
value = self.p_position * 100.0 / self.p_duration
self.adjustment.set_value(value)
 
return True
 
def _fill_status_changed(self, player, fill_value):
self.hscale.set_fill_level(fill_value)
self.hscale.set_show_fill_level(True)
 
def main(args):
def usage():
sys.stderr.write("usage: %s URI-OF-MEDIA-FILE\n" % args[0])
sys.exit(1)
 
# Need to register our derived widget types for implicit event
# handlers to get called.
gobject.type_register(PlayerWindow)
gobject.type_register(VideoWidget)
 
w = PlayerWindow()
 
if len(args) != 2:
usage()
 
if not gst.uri_is_valid(args[1]):
sys.stderr.write("Error: Invalid URI: %s\n" % args[1])
sys.exit(1)
 
w.load_file(args[1])
w.show_all()
 
gtk.main()
 
if __name__ == '__main__':
sys.exit(main(sys.argv))

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