gstreamer/bindings/python/examples/simple.py

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# GStreamer
#
# Copyright (C) 2013 Thibault Saunier <tsaunier@gnome.org
#
# This library is free software; you can redistribute it and/or
# modify it under the terms of the GNU Library General Public
# License as published by the Free Software Foundation; either
# version 2 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
# Library General Public License for more details.
#
# You should have received a copy of the GNU Library General Public
# License along with this library; if not, write to the
# Free Software Foundation, Inc., 51 Franklin Street, Suite 500,
# Boston, MA 02110-1335, USA.
import os
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from gi.repository import Gst, GES, GLib
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class Simple:
def __init__(self, uri):
timeline = GES.Timeline.new_audio_video()
self.project = timeline.get_asset()
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self.project.connect("asset-added", self._asset_added_cb)
self.project.connect("error-loading-asset", self._error_loading_asset_cb)
self.project.create_asset(uri, GES.UriClip)
self.layer = timeline.append_layer()
self._create_pipeline(timeline)
self.loop = GLib.MainLoop()
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def _create_pipeline(self, timeline):
self.pipeline = GES.Pipeline()
self.pipeline.set_timeline(timeline)
bus = self.pipeline.get_bus()
bus.add_signal_watch()
bus.connect("message", self.bus_message_cb)
def bus_message_cb(self, unused_bus, message):
if message.type == Gst.MessageType.EOS:
print "eos"
self.loop.quit()
elif message.type == Gst.MessageType.ERROR:
error = message.parse_error()
print "error %s" % error[1]
self.loop.quit()
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def start(self):
self.loop.run()
def _asset_added_cb(self, project, asset):
self.layer.add_asset(asset, 0, 0, Gst.SECOND * 5, GES.TrackType.UNKNOWN)
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self.pipeline.set_state(Gst.State.PLAYING)
def _error_loading_asset_cb(self, project, error, asset_id, type):
print "Could not load asset %s: %s" % (asset_id, error)
self.loop.quit()
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if __name__ == "__main__":
if len(os.sys.argv) != 2:
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print "You must specify a file URI"
exit(-1)
Gst.init(None)
GES.init()
simple = Simple(os.sys.argv[1])
simple.start()