gst_base_sink_do_preroll 2372 libs/gst/base/gstbasesink.c   ret = gst_base_sink_do_preroll (basesink, obj);
gst_base_sink_do_preroll  196 libs/gst/base/gstbasesink.h GstFlowReturn   gst_base_sink_do_preroll        (GstBaseSink *sink, GstMiniObject *obj);