mediagoblin/tests/media_tools.py

   1 # GNU MediaGoblin -- federated, autonomous media hosting
   2 # Copyright (C) 2013 MediaGoblin contributors.  See AUTHORS.
   3 #
   4 # This program is free software: you can redistribute it and/or modify
   5 # it under the terms of the GNU Affero General Public License as published by
   6 # the Free Software Foundation, either version 3 of the License, or
   7 # (at your option) any later version.
   8 #
   9 # This program is distributed in the hope that it will be useful,
  10 # but WITHOUT ANY WARRANTY; without even the implied warranty of
  11 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12 # GNU Affero General Public License for more details.
  13 #
  14 # You should have received a copy of the GNU Affero General Public License
  15 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
  16
  17 from contextlib import contextmanager
  18 import tempfile
  19
  20 import gi
  21 gi.require_version('Gst', '1.0')
  22 from gi.repository import Gst
  23 Gst.init(None)
  24
  25 @contextmanager
  26 def create_av(make_video=False, make_audio=False):
  27     'creates audio/video in `path`, throws AssertionError on any error'
  28     media = tempfile.NamedTemporaryFile(suffix='.ogg')
  29     pipeline = Gst.Pipeline()
  30     mux = Gst.ElementFactory.make('oggmux', 'mux')
  31     pipeline.add(mux)
  32     if make_video:
  33         video_src = Gst.ElementFactory.make('videotestsrc', 'video_src')
  34         video_src.set_property('num-buffers', 20)
  35         video_enc = Gst.ElementFactory.make('theoraenc', 'video_enc')
  36         pipeline.add(video_src)
  37         pipeline.add(video_enc)
  38         assert video_src.link(video_enc)
  39         assert video_enc.link(mux)
  40     if make_audio:
  41         audio_src = Gst.ElementFactory.make('audiotestsrc', 'audio_src')
  42         audio_src.set_property('num-buffers', 20)
  43         audio_enc = Gst.ElementFactory.make('vorbisenc', 'audio_enc')
  44         pipeline.add(audio_src)
  45         pipeline.add(audio_enc)
  46         assert audio_src.link(audio_enc)
  47         assert audio_enc.link(mux)
  48     sink = Gst.ElementFactory.make('filesink', 'sink')
  49     sink.set_property('location', media.name)
  50     pipeline.add(sink)
  51     mux.link(sink)
  52     pipeline.set_state(Gst.State.PLAYING)
  53     state = pipeline.get_state(Gst.SECOND)
  54     assert state[0] == Gst.StateChangeReturn.SUCCESS
  55     bus = pipeline.get_bus()
  56     message = bus.timed_pop_filtered(
  57             Gst.SECOND,  # one second should be more than enough for 50-buf vid
  58             Gst.MessageType.ERROR | Gst.MessageType.EOS)
  59     assert message.type == Gst.MessageType.EOS
  60     pipeline.set_state(Gst.State.NULL)
  61     yield media.name