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# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU Lesser General Public
# License as published by the Free Software Foundation; either
# version 2.1 of the License, or (at your option) any later version.
#
# This library is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
# Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public
# License along with this library; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
# USA
# Copyright (C) 2013 Manuel Kaufmann <humitos@gmail.com>
import logging
from gi.repository import Gst
from gi.repository import GObject
# Needed for window.get_xid(), xvimagesink.set_window_handle(),
# respectively:
from gi.repository import GdkX11, GstVideo
# Avoid "Fatal Python error: GC object already tracked"
# http://stackoverflow.com/questions/7496629/
# gstreamer-appsrc-causes-random-crashes
# GObject.threads_init()
# Initialize GStreamer
Gst.init(None)
class GstPlayer(GObject.GObject):
__gsignals__ = {
'error': (GObject.SignalFlags.RUN_FIRST, None, [str, str]),
'eos': (GObject.SignalFlags.RUN_FIRST, None, []),
'play': (GObject.SignalFlags.RUN_FIRST, None, []),
}
def __init__(self):
GObject.GObject.__init__(self)
self.playing = False
self.error = False
# Create GStreamer pipeline
self.pipeline = Gst.Pipeline()
# Create bus to get events from GStreamer pipeline
self.bus = self.pipeline.get_bus()
self.bus.add_signal_watch()
self.bus.connect('message::eos', self.__on_eos_message)
self.bus.connect('message::error', self.__on_error_message)
# This is needed to make the video output in our DrawingArea
self.bus.enable_sync_message_emission()
self.bus.connect('sync-message::element', self.__on_sync_message)
# Create GStreamer elements
self.player = Gst.ElementFactory.make('playbin', None)
self.pipeline.add(self.player)
def init_view_area(self, videowidget):
videowidget.realize()
self.videowidget = videowidget
self.videowidget_xid = videowidget.get_window().get_xid()
def __on_error_message(self, bus, msg):
self.stop()
self.playing = False
self.error = True
err, debug = msg.parse_error()
self.emit('error', err, debug)
def __on_eos_message(self, bus, msg):
logging.debug('SIGNAL: eos')
self.playing = False
self.emit('eos')
def __on_sync_message(self, bus, msg):
if msg.get_structure().get_name() == 'prepare-window-handle':
msg.src.set_window_handle(self.videowidget_xid)
def set_uri(self, uri):
self.pipeline.set_state(Gst.State.READY)
# gstreamer needs the 'file://' prefix
uri = 'file://' + uri
logging.debug('URI: %s', uri)
self.player.set_property('uri', uri)
def query_position(self):
"Returns a (position, duration) tuple"
p_success, position = self.player.query_position(Gst.Format.TIME)
d_success, duration = self.player.query_duration(Gst.Format.TIME)
return (p_success and d_success, position, duration)
def seek(self, location):
"""
@param location: time to seek to, in nanoseconds
"""
logging.debug('Seek: %s ns', location)
self.pipeline.seek_simple(Gst.Format.TIME,
Gst.SeekFlags.FLUSH | Gst.SeekFlags.KEY_UNIT,
location)
def pause(self):
logging.debug("pausing player")
self.pipeline.set_state(Gst.State.PAUSED)
self.playing = False
def play(self):
logging.debug("playing player")
self.pipeline.set_state(Gst.State.PLAYING)
self.playing = True
self.error = False
self.emit('play')
def stop(self):
self.playing = False
self.pipeline.set_state(Gst.State.NULL)
logging.debug("stopped player")
def get_state(self, timeout=1):
return self.player.get_state(timeout=timeout)
def is_playing(self):
return self.playing
def playing_video(self):
return self.player.props.n_video > 0
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