+ case CHANGE_ALL:
+ create_cache();
+ case CHANGE_EDL:
+ create_render_engine();
+ break;
+ case CHANGE_PARAMS: {
+ renderengine_lock->lock("PlaybackEngine::perform_change");
+ EDL *edl = render_engine ? render_engine->get_edl() : 0;
+ if( edl ) edl->add_user();
+ renderengine_lock->unlock();
+ if( !edl ) break;
+ edl->synchronize_params(command->get_edl());
+ edl->remove_user();
+ }
+ case CHANGE_NONE: