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143 lines
5.2 KiB
Text
143 lines
5.2 KiB
Text
SCENARIOS
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* Adding a TimelineObject to a TimelineLayer
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--------------------------------------------
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* Create a Timeline
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* Create a Track
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* Add the track to the Timeline (==> ges_timeline_add_track (track);)
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The Timeline adds the Track to itself (i.e. gst_bin_add())
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'track-added' is emitted
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* Create a TimelineLayer
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* Add the TimelineLayer to the Timeline (ges_timeline_add_layer (layer);)
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The Timeline takes a reference on the layer and stores it
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The Timeline tells the TimelineLayer that it now belongs to the given Timeline (weak reference)
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==> ges_timeline_layer_set_timeline ();
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'layer-added' is emitted
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* Create a TimelineObject
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* Add the TimelineObject to the TimelineLayer (ges_timeline_layer_add_object (object);)
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The TimelineLayer takes a reference on the TimelineObject and stores it
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The timelineLayer tells the TimelineObject that it now belongs to the given layer (weak reference)
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==> ges_timeline_object_set_layer ();
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'object-added' is emitted by TimelineLayer
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The Timeline requests a new TrackObject from the new TimelineObject for each Track
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==> ges_timeline_object_create_track_object (track)
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The TimelineObject calls the 'create_track_object' virtual method with the given track
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Example implementation
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Create a GESTrackSource
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(GESTimelineObject is a constructor property of track objects)
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A GESTrackObject CAN NOT EXIST WITHOUT A GESTimelineObject !
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The Timeline adds the newly created TrackObject to the Track
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==> ges_track_add_object (track, trackobject);
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Set the track on the TrackObject
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==> ges_track_object_set_track (track)
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The GESTrackObject can create the NleObject
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Methods
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-------
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[ GESTimeline ]
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* gboolean
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ges_timeline_add_track (GESTimeline * timeline, GESTrack * track);
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* The Timeline adds the track to itself (gst_bin_add ()) # reference implicitely taken
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* The Timeline adds the track to its list of tracked tracks
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* The Timeline sets the Timeline on the track
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=> ges_track_set_timeline (GESTrack * track, GESTimeline * timeline);
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Just sets the timeline field of the track.
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* emits 'track-added'
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* gboolean
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ges_timeline_add_layer (GESTimeline * timeline, GESTimelineLayer * layer);
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* The Timeline takes a reference on the layer and stores it
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* The Timeline tells the Layer that it now belongs to the given Timeline
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=> ges_timeline_layer_set_timeline (GESTimelineLayer * layer, GESTimeline * timeline);
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Just sets the timeline field of the layer.
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* Connect to the layer's 'object-added' signal
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* emits 'layer-added'
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* GESTimeline's
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callback for GESTimelineLayer::object-added (GESTimelineLayer * layer, GESTimelineObject * object);
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* For each GESTrack in the Timeline:
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* The timeline requests a new TrackObject for the new TimelineObject for each Track
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trackobj = ges_timeline_object_create_track_object (timelineobj, track);
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* The timeline adds the newly created TrackObject to the track
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ges_track_add_object (track, trackobj);
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[ GESTimelineLayer ]
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* gboolean
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ges_timeline_layer_add_object (GESTimelineLayer * layer, GESTimelineObject * object);
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* The TimelineLayer takes a reference on the TimelineObject and stores it
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* The TimelineLayer tells the TimelineObject it now belongs to the given Layer
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=> ges_timeline_object_set_layer (GESTimelineObject * object, GESTimelineLayer * layer);
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Just sets the layer field of the timeline object.
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* emits 'object-added'
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[ GESTimelineObject ]
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* GESTrackObject *
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ges_timeline_object_create_track_object (GESTimelineObject * object, GESTrack * track);
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* The TimelineObject calls the 'create_track_object' virtual method
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* The TimelineObject sets the TimelineObject on the new TrackObject
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=> ges_track_object_set_timeline_object (track_object, timeline_object);
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Just sets the timeline-object field of the TrackObject
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* Return the newly created GESTrackObject
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* Virtual-method for GESTimelineObject::create_track_object (GESTimelineObject * object, GESTrack * track);
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* Create a track object of the proper type
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Ex (for a source) :
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return ges_track_source_new();
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* gboolean
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ges_timeline_object_fill_track_object (GESTimelineObject *tlo, GESTrackObject *tro, GstElement *nleobj);
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* up to the implementation :)
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[ GESTrack ]
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* gboolean
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ges_track_add_object (GESTrack * track, GESTrackObject * object);
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* Set the track on the track_object
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ges_track_object_set_track (object, track);
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* Add the NleObject of the TrackObject to the composition
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gst_bin_add (track->composition, object->nleobject);
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[ GESTrackObject ]
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* gboolean
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ges_track_object_set_track (GESTrackObject * object, GESTrack * track);
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* Set the track field of the TrackObject
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* if no NleObject is available yet:
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* Call the 'create_gnl_object' virtual method
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* Virtual-method for GESTrackObject::create_gnl_object
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* Create a NleObject of the proper type
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Ex : nleobject = gst_element_factory_make("nlesource", NULL);
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* Ask the TimelineObject to fill in the NleObject
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=> ges_timeline_object_fill_track_object (GESTimelineObject * tlo, GESTrackObject * tro, GstElement * nleobj);
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