Python pipeline.Pipeline類代碼示例

    def testMultiple(self):
        """Test a dual stream encoding with separates sources"""
        settings = RenderSettings(settings=[self.asettings, self.vsettings],
                                  muxer="oggmux")
        sf = RenderSinkFactory(RenderFactory(settings=settings),
                               common.FakeSinkFactory())
        a = RenderAction()
        a.addConsumers(sf)
        a.addProducers(self.vsrc, self.asrc)

        p = Pipeline()
        a.setPipeline(p)

        a.activate()
        self.assertEquals(len(a._links), 2)

        p.play()
        time.sleep(3)
        p.getState()
        p.stop()
        a.deactivate()

        a.unsetPipeline()

        p.release()

    def testPendingLink(self):
        a = Action()
        p = Pipeline()
        src = common.FakeGnlFactory()
        src.addOutputStream(VideoStream(gst.Caps("video/x-raw-yuv"),
                                        pad_name="src"))
        sink = common.FakeSinkFactory()
        sink.addInputStream(MultimediaStream(gst.Caps("any"),
                                             pad_name="sink"))

        # set the link, it will be activated once the pad is added
        a.setLink(src, sink)
        # Let's see if the link is present
        self.assertEquals(a._links, [(src, sink, None, None)])

        p.setAction(a)

        gst.debug("about to activate action")
        a.activate()
        # only the producer and the consumer are created, the other elements are
        # created dinamically
        self.assertEquals(len(list(p._pipeline.elements())), 2)

        p.setState(STATE_PLAYING)
        time.sleep(1)
        # and make sure that all other elements were created (4)
        # FIXME  if it's failing here, run the test a few times trying to raise
        # the time.sleep() above, it may just be racy...
        self.assertEquals(len(list(p._pipeline.elements())), 4)

        a.deactivate()
        p.setState(STATE_NULL)
        self.assertEquals(len(list(p._pipeline.elements())), 0)
        p.release()

    def testSimpleStreams(self):
        """Test a RenderSettings with exact stream settings"""
        # let's force the video to some unusual size
        outs = VideoStream(gst.Caps("video/x-raw-yuv,width=624,height=230,framerate=10/1"))
        fset = StreamEncodeSettings(encoder="theoraenc", input_stream=outs)
        settings = RenderSettings(settings=[fset], muxer="oggmux")
        sf = RenderSinkFactory(RenderFactory(settings=settings),
                               common.FakeSinkFactory())

        a = RenderAction()
        a.addConsumers(sf)
        a.addProducers(self.vsrc)

        p = Pipeline()
        a.setPipeline(p)

        a.activate()
        self.assertEquals(len(a._links), 1)

        p.play()
        time.sleep(3)
        p.getState()
        p.stop()
        a.deactivate()

        p.release()

    def __init__(self, name="", uri=None, **kwargs):
        """
        @param name: the name of the project
        @param uri: the uri of the project
        """
        Loggable.__init__(self)
        self.log("name:%s, uri:%s", name, uri)
        self.name = name
        self.settings = None
        self.description = ""
        self.uri = uri
        self.urichanged = False
        self.format = None
        self.sources = SourceList()
        self.sources.connect("source-added", self._sourceAddedCb)
        self.sources.connect("source-removed", self._sourceRemovedCb)

        self._dirty = False

        self.timeline = Timeline()

        self.factory = TimelineSourceFactory(self.timeline)
        self.pipeline = Pipeline()
        self.view_action = ViewAction()
        self.view_action.addProducers(self.factory)
        self.seeker = Seeker(80)

        self.settings = ExportSettings()
        self._videocaps = self.settings.getVideoCaps()

    def testSettingFactoriesSimple(self):
        """Simple add/remove Factory tests"""
        ac = Action()
        p = Pipeline()

        src = common.FakeSourceFactory()
        sink = common.FakeSinkFactory()

        # you can't set a Sink element as a producer
        self.failUnlessRaises(ActionError, ac.addProducers, sink)
        # you can't set a Source element as a consumer
        self.failUnlessRaises(ActionError, ac.addConsumers, src)

        # if the action is active, you can't add anything
        ac.state = STATE_ACTIVE
        self.failUnlessRaises(ActionError, ac.addProducers, src)
        self.failUnlessRaises(ActionError, ac.addConsumers, sink)
        ac.state = STATE_NOT_ACTIVE

        # Set a producer and consumer on the action
        ac.addProducers(src)
        ac.addConsumers(sink)

        self.assertEquals(ac.producers, [src])
        self.assertEquals(ac.consumers, [sink])

        self.failUnlessRaises(ActionError, ac.removeProducers, sink)
        self.failUnlessRaises(ActionError, ac.removeConsumers, src)
        self.assertEquals(ac.producers, [src])
        self.assertEquals(ac.consumers, [sink])

        # you can't remove anything from an active action
        ac.state = STATE_ACTIVE
        self.failUnlessRaises(ActionError, ac.removeProducers, src)
        self.failUnlessRaises(ActionError, ac.removeConsumers, sink)
        ac.state = STATE_NOT_ACTIVE

        # finally, attempt correct removal
        ac.removeProducers(src)
        self.assertEquals(ac.producers, [])
        self.assertEquals(ac.consumers, [sink])

        ac.removeConsumers(sink)
        self.assertEquals(ac.producers, [])
        self.assertEquals(ac.consumers, [])

        p.release()

 def setUp(self):
     TestCase.setUp(self)
     gst.debug("start")
     self.pipeline = Pipeline()
     self.monitor = SignalMonitor(self.pipeline, 'action-added',
                                  'action-removed', 'factory-added',
                                  'factory-removed', 'state-changed')
     self.assertEquals(self.monitor.action_added_count, 0)
     self.assertEquals(self.monitor.action_added_collect, [])

    def testAddRemoveActionAdvanced(self):
        """ Advanced add/remove of Actions """
        ac1 = BogusAction()
        ac2 = BogusAction()
        p2 = Pipeline()

        res = self.pipeline.addAction(ac1)
        self.assertEquals(self.pipeline.actions, [ac1])

        # we can't add an action to two pipelines at the same time
        self.failUnlessRaises(PipelineError, p2.addAction, ac1)

        self.pipeline.removeAction(ac1)
        self.assertEquals(self.pipeline.actions, [])

        res = self.pipeline.setAction(ac1)
        self.assertEquals(res, ac1)
        self.assertEquals(self.pipeline.actions, [ac1])
        # calling setAction while a similar action is already set should
        # return the existing action and not change anything else
        res = self.pipeline.setAction(ac2)
        self.assertEquals(res, ac1)
        self.assertEquals(self.pipeline.actions, [ac1])

        # we can't remove active actions while in PAUSED/PLAYING
        self.pipeline.setState(STATE_PAUSED)
        ac1.state = STATE_ACTIVE
        self.assertEquals(self.pipeline.getState(), STATE_PAUSED)
        self.failUnlessRaises(PipelineError, self.pipeline.removeAction, ac1)

        # but we can remove deactivated actions while in PAUSED/PLAYING
        self.pipeline.setState(STATE_PAUSED)
        ac1.state = STATE_NOT_ACTIVE
        self.assertEquals(self.pipeline.getState(), STATE_PAUSED)
        self.pipeline.removeAction(ac1)

        # we can add actions while in PAUSED/PLAYING
        res = self.pipeline.addAction(ac2)
        self.assertEquals(res, ac2)
        self.assertEquals(self.pipeline.actions, [ac2])

        self.pipeline.removeAction(ac2)
        p2.release()

    def testPipelineSimple(self):
        """ Test setPipeline and unsetPipeline """
        ac = Action()
        p = Pipeline()
        p2 = Pipeline()

        # set a Pipeline
        ac.setPipeline(p)
        self.assertEquals(ac.pipeline, p)

        # Setting a different Pipeline should fail...
        self.failUnlessRaises(ActionError, ac.setPipeline, p2)

        # ... but setting the same Pipeline again should silently succeed
        ac.setPipeline(p)

        # remove the Pipeline
        ac.unsetPipeline()
        self.assertEquals(ac.pipeline, None)

        # and now setting the other Pipeline should succeed
        ac.setPipeline(p2)
        self.assertEquals(ac.pipeline, p2)

        # remove the Pipeline again
        ac.unsetPipeline()
        self.assertEquals(ac.pipeline, None)

        # internally set the state to ACTIVE
        ac.state = STATE_ACTIVE
        # now setting any Pipeline should fail !
        self.failUnlessRaises(ActionError, ac.setPipeline, p)

        # internally set the state to NOT_ACTIVE
        ac.state = STATE_NOT_ACTIVE
        self.assertEquals(ac.isActive(), False)

        # Set a pipeline
        ac.setPipeline(p)
        self.assertEquals(ac.pipeline, p)

        # interally set the state to ACTIVE
        ac.state = STATE_ACTIVE
        # we shouldn't be able to unset a pipeline from an active Action
        self.failUnlessRaises(ActionError, ac.unsetPipeline)

        # cleanup
        ac.state = STATE_NOT_ACTIVE
        ac.unsetPipeline()

        p.release()
        p2.release()

    def setUp(self):
        self.mainloop = GObject.MainLoop()

        samples = os.path.join(os.path.dirname(__file__), "samples")
        self.facs = []
        self.facs.append([PictureFileSourceFactory('file://' + os.path.join(samples, "flat_colour1_640x480.png")), VideoStream(Gst.Caps("video/x-raw-rgb,bpp=(int)24,depth=(int)24,endianness=(int)4321,red_mask=(int)16711680,green_mask=(int)65280,blue_mask=(int)255"))])
        self.facs.append([PictureFileSourceFactory('file://' + os.path.join(samples, "flat_colour2_640x480.png")), VideoStream(Gst.Caps("video/x-raw-rgb,bpp=(int)24,depth=(int)24,endianness=(int)4321,red_mask=(int)16711680,green_mask=(int)65280,blue_mask=(int)255"))])
        self.facs.append([PictureFileSourceFactory('file://' + os.path.join(samples, "flat_colour3_320x180.png")), VideoStream(Gst.Caps("video/x-raw-rgb,bpp=(int)24,depth=(int)24,endianness=(int)4321,red_mask=(int)16711680,green_mask=(int)65280,blue_mask=(int)255"))])
        # one video with a different resolution
        self.facs.append([VideoTestSourceFactory(), VideoStream(Gst.Caps('video/x-raw-yuv,width=(int)640,height=(int)480,format=(fourcc)I420'))])

        # configure durations and add output streams to factories
        for fac in self.facs:
            factory = fac[0]
            stream = fac[1]
            factory.duration = self.clip_duration
            factory.addOutputStream(stream)
        self.track_objects = []
        self.track = Track(self.facs[0][1])
        self.timeline = Timeline()
        self.timeline.addTrack(self.track)

        vsettings = StreamEncodeSettings(renderer="theoraenc")
        rsettings = RenderSettings(settings=[vsettings],
                                   muxer="oggmux")
        self.fakesink = common.FakeSinkFactory()
        rendersink = RenderSinkFactory(RenderFactory(settings=rsettings),
                                       self.fakesink)
        self.render = RenderAction()
        self.pipeline = Pipeline()
        self.pipeline.connect("eos", self._renderEOSCb)
        self.pipeline.connect("error", self._renderErrorCb)
        self.pipeline.addAction(self.render)
        self.render.addConsumers(rendersink)
        timeline_factory = TimelineSourceFactory(self.timeline)
        self.render.addProducers(timeline_factory)

class TestStillImage(TestCase):
    clip_duration = 3 * Gst.SECOND

    def setUp(self):
        self.mainloop = GObject.MainLoop()

        samples = os.path.join(os.path.dirname(__file__), "samples")
        self.facs = []
        self.facs.append([PictureFileSourceFactory('file://' + os.path.join(samples, "flat_colour1_640x480.png")), VideoStream(Gst.Caps("video/x-raw-rgb,bpp=(int)24,depth=(int)24,endianness=(int)4321,red_mask=(int)16711680,green_mask=(int)65280,blue_mask=(int)255"))])
        self.facs.append([PictureFileSourceFactory('file://' + os.path.join(samples, "flat_colour2_640x480.png")), VideoStream(Gst.Caps("video/x-raw-rgb,bpp=(int)24,depth=(int)24,endianness=(int)4321,red_mask=(int)16711680,green_mask=(int)65280,blue_mask=(int)255"))])
        self.facs.append([PictureFileSourceFactory('file://' + os.path.join(samples, "flat_colour3_320x180.png")), VideoStream(Gst.Caps("video/x-raw-rgb,bpp=(int)24,depth=(int)24,endianness=(int)4321,red_mask=(int)16711680,green_mask=(int)65280,blue_mask=(int)255"))])
        # one video with a different resolution
        self.facs.append([VideoTestSourceFactory(), VideoStream(Gst.Caps('video/x-raw-yuv,width=(int)640,height=(int)480,format=(fourcc)I420'))])

        # configure durations and add output streams to factories
        for fac in self.facs:
            factory = fac[0]
            stream = fac[1]
            factory.duration = self.clip_duration
            factory.addOutputStream(stream)
        self.track_objects = []
        self.track = Track(self.facs[0][1])
        self.timeline = Timeline()
        self.timeline.addTrack(self.track)

        vsettings = StreamEncodeSettings(renderer="theoraenc")
        rsettings = RenderSettings(settings=[vsettings],
                                   muxer="oggmux")
        self.fakesink = common.FakeSinkFactory()
        rendersink = RenderSinkFactory(RenderFactory(settings=rsettings),
                                       self.fakesink)
        self.render = RenderAction()
        self.pipeline = Pipeline()
        self.pipeline.connect("eos", self._renderEOSCb)
        self.pipeline.connect("error", self._renderErrorCb)
        self.pipeline.addAction(self.render)
        self.render.addConsumers(rendersink)
        timeline_factory = TimelineSourceFactory(self.timeline)
        self.render.addProducers(timeline_factory)

    def tearDown(self):
        self.mainloop.quit()

    def configureStreams(self, inputs, offsets):
        count = 0
        for i in inputs:
            factory = self.facs[i][0]
            stream = self.facs[i][1]
            track_object = SourceTrackObject(factory, stream)
            self.track_objects.append(track_object)
            track_object.start = offsets[count]
            self.track.addTrackObject(track_object)
            count += 1

    def startRender(self):
        self.render.activate()
        self.data_written = 0
        self.fakesink.bins[0].props.signal_handoffs = True
        self.fakesink.bins[0].connect("handoff", self._fakesinkHandoffCb)
        self.pipeline.play()
        self.mainloop.run()

    def _fakesinkHandoffCb(self, fakesink, buf, pad):
        self.data_written += buf.size

    def _renderEOSCb(self, obj):
        self.mainloop.quit()
        # check the render was successful
        self.assertTrue(self.data_written > 0)

    def _renderErrorCb(self, obj, error, details):
        print "Error: %s\nDetails: %s" % (str(error), str(details))
        self.fail("Pipeline rendering error")

    def cleanUp(self):
        self.render.deactivate()
        self.track.removeAllTrackObjects()
        self.track_objects = []

    def testRendering(self):
        # use one of the still image streams
        self.configureStreams(range(1), [0])
        self.startRender()
        self.cleanUp()

        # use two images with the same resolution and concatenate them
        self.configureStreams(range(2), [0, self.clip_duration])
        self.startRender()
        self.cleanUp()

        # concatenate images with different resolutions
        self.configureStreams(range(3), [0, self.clip_duration, 2 * self.clip_duration])
        self.startRender()
        self.cleanUp()

        # mix images with different resolutions by overlapping
        self.configureStreams(range(3), [0, self.clip_duration // 2, self.clip_duration])
        self.startRender()
        self.cleanUp()

#.........這裏部分代碼省略.........

class TestPipeline(TestCase):

    def setUp(self):
        TestCase.setUp(self)
        gst.debug("start")
        self.pipeline = Pipeline()
        self.monitor = SignalMonitor(self.pipeline, 'action-added',
                                     'action-removed', 'factory-added',
                                     'factory-removed', 'state-changed')
        self.assertEquals(self.monitor.action_added_count, 0)
        self.assertEquals(self.monitor.action_added_collect, [])

    def tearDown(self):
        self.pipeline.setState(STATE_NULL)
        self.pipeline.release()
        self.monitor.disconnectFromObj(self.pipeline)
        del self.pipeline
        del self.monitor
        TestCase.tearDown(self)

    def testAddRemoveActionSimple(self):
        """ Simple add/remove of Actions """
        ac1 = BogusAction()

        # add the action to the pipeline
        res = self.pipeline.addAction(ac1)
        # the returned value should be the given action
        self.assertEquals(res, ac1)
        # it should now be in the list of actions...
        self.failUnlessEqual(self.pipeline.actions, [ac1])
        # ... and the action should be set to that pipeline
        self.failUnlessEqual(ac1.pipeline, self.pipeline)
        # the 'action-added' signal should be triggered once
        self.assertEquals(self.monitor.action_added_count, 1)
        # And it contained our action
        self.assertEquals(self.monitor.action_added_collect, [(ac1, )])

        # if we try to add that action again, it should be silently ignored
        res = self.pipeline.addAction(ac1)
        self.assertEquals(res, ac1)
        # the list of actions shouldn't have changed
        self.failUnlessEqual(self.pipeline.actions, [ac1])
        # it shouldn't have changed the pipeline set on action
        self.failUnlessEqual(ac1.pipeline, self.pipeline)
        # the 'action-added' signal should NOT have been triggered again
        self.assertEquals(self.monitor.action_added_count, 1)

        # And now to remove it
        self.pipeline.removeAction(ac1)
        # the 'action-removed' signal should have been triggered once..
        self.assertEquals(self.monitor.action_removed_count, 1)
        # .. with the action as an argument
        self.assertEquals(self.monitor.action_removed_collect, [(ac1, )])
        # And there should be no actions left on the pipeline
        self.assertEquals(self.pipeline.actions, [])

    def testAddRemoveActionAdvanced(self):
        """ Advanced add/remove of Actions """
        ac1 = BogusAction()
        ac2 = BogusAction()
        p2 = Pipeline()

        res = self.pipeline.addAction(ac1)
        self.assertEquals(self.pipeline.actions, [ac1])

        # we can't add an action to two pipelines at the same time
        self.failUnlessRaises(PipelineError, p2.addAction, ac1)

        self.pipeline.removeAction(ac1)
        self.assertEquals(self.pipeline.actions, [])

        res = self.pipeline.setAction(ac1)
        self.assertEquals(res, ac1)
        self.assertEquals(self.pipeline.actions, [ac1])
        # calling setAction while a similar action is already set should
        # return the existing action and not change anything else
        res = self.pipeline.setAction(ac2)
        self.assertEquals(res, ac1)
        self.assertEquals(self.pipeline.actions, [ac1])

        # we can't remove active actions while in PAUSED/PLAYING
        self.pipeline.setState(STATE_PAUSED)
        ac1.state = STATE_ACTIVE
        self.assertEquals(self.pipeline.getState(), STATE_PAUSED)
        self.failUnlessRaises(PipelineError, self.pipeline.removeAction, ac1)

        # but we can remove deactivated actions while in PAUSED/PLAYING
        self.pipeline.setState(STATE_PAUSED)
        ac1.state = STATE_NOT_ACTIVE
        self.assertEquals(self.pipeline.getState(), STATE_PAUSED)
        self.pipeline.removeAction(ac1)

        # we can add actions while in PAUSED/PLAYING
        res = self.pipeline.addAction(ac2)
        self.assertEquals(res, ac2)
        self.assertEquals(self.pipeline.actions, [ac2])

        self.pipeline.removeAction(ac2)
        p2.release()

#.........這裏部分代碼省略.........

class Project(Signallable, Loggable):
    """The base class for PiTiVi projects

    @ivar name: The name of the project
    @type name: C{str}
    @ivar description: A description of the project
    @type description: C{str}
    @ivar sources: The sources used by this project
    @type sources: L{SourceList}
    @ivar timeline: The timeline
    @type timeline: L{Timeline}
    @ivar pipeline: The timeline's pipeline
    @type pipeline: L{Pipeline}
    @ivar factory: The timeline factory
    @type factory: L{TimelineSourceFactory}
    @ivar format: The format under which the project is currently stored.
    @type format: L{FormatterClass}
    @ivar loaded: Whether the project is fully loaded or not.
    @type loaded: C{bool}

    Signals:
     - C{loaded} : The project is now fully loaded.
    """

    __signals__ = {
        "settings-changed" : ['old', 'new'],
        "project-changed" : [],
        }

    def __init__(self, name="", uri=None, **kwargs):
        """
        @param name: the name of the project
        @param uri: the uri of the project
        """
        Loggable.__init__(self)
        self.log("name:%s, uri:%s", name, uri)
        self.name = name
        self.settings = None
        self.description = ""
        self.uri = uri
        self.urichanged = False
        self.format = None
        self.sources = SourceList()
        self.sources.connect("source-added", self._sourceAddedCb)
        self.sources.connect("source-removed", self._sourceRemovedCb)

        self._dirty = False

        self.timeline = Timeline()

        self.factory = TimelineSourceFactory(self.timeline)
        self.pipeline = Pipeline()
        self.view_action = ViewAction()
        self.view_action.addProducers(self.factory)
        self.seeker = Seeker(80)

        self.settings = ExportSettings()
        self._videocaps = self.settings.getVideoCaps()

    def release(self):
        self.pipeline.release()
        self.pipeline = None

    #{ Settings methods

    def getSettings(self):
        """
        return the currently configured settings.
        """
        self.debug("self.settings %s", self.settings)
        return self.settings

    def setSettings(self, settings):
        """
        Sets the given settings as the project's settings.
        @param settings: The new settings for the project.
        @type settings: ExportSettings
        """
        assert settings
        self.log("Setting %s as the project's settings", settings)
        oldsettings = self.settings
        self.settings = settings
        self._projectSettingsChanged()
        self.emit('settings-changed', oldsettings, settings)

    #}

    #{ Save and Load features

    def setModificationState(self, state):
        self._dirty = state
        if state:
            self.emit('project-changed')

    def hasUnsavedModifications(self):
        return self._dirty

    def _projectSettingsChanged(self):
        settings = self.getSettings()
        self._videocaps = settings.getVideoCaps()
#.........這裏部分代碼省略.........

    def testPipelineAction(self):
        """Testing pipeline state interaction"""
        p = Pipeline()
        a = Action()
        src = VideoTestSourceFactory()
        sink = common.FakeSinkFactory()
        sink.addInputStream(MultimediaStream(gst.Caps("any"), pad_name="sink"))

        # set the Action on the Pipeline
        p.setAction(a)
        self.assertEquals(p.actions, [a])

        # set the Producer and Consumer
        a.addProducers(src)
        a.addConsumers(sink)

        a.setLink(src, sink)

        # activate the Action
        a.activate()

        self.failUnlessEqual(src.current_bins, 1)
        self.failUnlessEqual(sink.current_bins, 1)

        # call get*ForFactoryStream(..., automake=False). They will raise
        # exceptions if the action didn't create the elements.
        bin = p.getBinForFactoryStream(src, automake=False)
        p.releaseBinForFactoryStream(src)

        tee = p.getTeeForFactoryStream(src, automake=False)
        p.releaseTeeForFactoryStream(src)

        bin = p.getBinForFactoryStream(sink, automake=False)

        queue = p.getQueueForFactoryStream(sink, automake=False)

        self.failUnlessEqual(queue.get_pad('src').get_peer().get_parent(), bin)

        p.releaseBinForFactoryStream(sink)
        p.releaseQueueForFactoryStream(sink)

        # switch to PLAYING
        p.setState(STATE_PLAYING)

        # wait half a second

        # switch to READY
        p.setState(STATE_READY)

        # deactivate action
        a.deactivate()

        # since we're the last Action to be release, the tees
        # and queues should have gone
        self.failUnlessEqual(src.current_bins, 0)
        self.failUnlessEqual(sink.current_bins, 0)

        # remove the action from the pipeline
        p.removeAction(a)

        # the gst.Pipeline should be empty !
        self.assertEquals(list(p._pipeline.elements()), [])

        p.release()

    def testDynamicLink(self):
        a = DynamicAction()
        p = Pipeline()
        src = common.FakeGnlFactory()
        src.addOutputStream(VideoStream(gst.Caps("video/x-raw-yuv"),
                                        pad_name="src"))

        # the link will be added dynamically
        self.assertEquals(a._links, [])

        p.setAction(a)
        a.addProducers(src)

        self.assertEquals(len(list(p._pipeline.elements())), 0)

        a.activate()
        # theoretically... there shouldn't only be the source, since
        # the pad for the source hasn't been created yet (and therefore not
        # requiring a consumer
        self.assertEquals(len(list(p._pipeline.elements())), 1)

        p.setState(STATE_PLAYING)
        time.sleep(1)
        p.getState()

        # and make sure that all other elements were created (4)
        self.assertEquals(len(list(p._pipeline.elements())), 4)

        p.setState(STATE_READY)
        time.sleep(1)
        a.deactivate()

        self.assertEquals(len(list(p._pipeline.elements())), 0)
        p.setState(STATE_NULL)

        p.release()

class Project(Signallable, Loggable):
    """The base class for PiTiVi projects

    @ivar name: The name of the project
    @type name: C{str}
    @ivar description: A description of the project
    @type description: C{str}
    @ivar sources: The sources used by this project
    @type sources: L{SourceList}
    @ivar timeline: The timeline
    @type timeline: L{Timeline}
    @ivar pipeline: The timeline's pipeline
    @type pipeline: L{Pipeline}
    @ivar factory: The timeline factory
    @type factory: L{TimelineSourceFactory}
    @ivar format: The format under which the project is currently stored.
    @type format: L{FormatterClass}
    @ivar loaded: Whether the project is fully loaded or not.
    @type loaded: C{bool}

    Signals:
     - C{loaded} : The project is now fully loaded.
    """

    __signals__ = {
        "settings-changed" : ['old', 'new'],
        }

    def __init__(self, name="", uri=None, **kwargs):
        """
        name : the name of the project
        uri : the uri of the project
        """
        Loggable.__init__(self)
        self.log("name:%s, uri:%s", name, uri)
        self.name = name
        self.settings = None
        self.description = ""
        self.uri = uri
        self.urichanged = False
        self.format = None
        self.sources = SourceList()
        self.sources.connect("source-added", self._sourceAddedCb)
        self.sources.connect("source-removed", self._sourceRemovedCb)

        self._dirty = False

        self.timeline = Timeline()

        self.factory = TimelineSourceFactory(self.timeline)
        self.pipeline = Pipeline()
        self.view_action = ViewAction()
        self.view_action.addProducers(self.factory)
        self.seeker = Seeker(80)

        self.getCapsFromSettings()

    def getCapsFromSettings(self):
        settings = self.getSettings()
        #formatstr = "video/x-raw-rgb,width=(int)%d,height=(int)%d;"\
        #    "video/x-raw-yuv,width=(int)%d,height=(int)%d"
        #capstr = formatstr % (
        #    settings.videowidth,
        #    settings.videoheight,
        #    settings.videowidth,
        #    settings.videoheight)
        #self._videocaps = gst.Caps(capstr)
        self._videocaps = settings.getVideoCaps()

    def release(self):
        self.pipeline.release()
        self.pipeline = None

    #{ Settings methods

    def getSettings(self):
        """
        return the currently configured settings.
        If no setting have been explicitely set, some smart settings will be
        chosen.
        """
        self.debug("self.settings %s", self.settings)
        return self.settings or self.getAutoSettings()

    def setSettings(self, settings):
        """
        Sets the given settings as the project's settings.
        If settings is None, the current settings will be unset
        """
        self.log("Setting %s as the project's settings", settings)
        oldsettings = self.settings
        self.settings = settings
        self._projectSettingsChanged()
        self.emit('settings-changed', oldsettings, settings)

    def unsetSettings(self, unused_settings):
        """ Remove the currently configured settings."""
        self.setSettings(None)

    def getAutoSettings(self):
#.........這裏部分代碼省略.........