gst_file_src_is_seekable  192 plugins/elements/gstfilesrc.c static gboolean gst_file_src_is_seekable (GstBaseSrc * src);
gst_file_src_is_seekable  298 plugins/elements/gstfilesrc.c   gstbasesrc_class->is_seekable = GST_DEBUG_FUNCPTR (gst_file_src_is_seekable);