gst_base_sink_wait_preroll 2207 libs/gst/base/gstbasesink.c       ret = gst_base_sink_wait_preroll (sink);
gst_base_sink_wait_preroll 2256 libs/gst/base/gstbasesink.c       ret = gst_base_sink_wait_preroll (sink);
gst_base_sink_wait_preroll  197 libs/gst/base/gstbasesink.h GstFlowReturn   gst_base_sink_wait_preroll      (GstBaseSink *sink);