G_BEGIN_DECLS
G_GNUC_INTERNAL
-char * gst_buffer_get_flags_string (GstBuffer *buffer);
+gchar * gst_buffer_get_flags_string (GstBuffer *buffer);
+
+G_GNUC_INTERNAL
+gchar * gst_buffer_get_meta_string (GstBuffer * buffer);
+
+G_GNUC_INTERNAL
+GstFlowReturn gst_writev_buffers (GstObject * sink, gint fd, GstPoll * fdset,
+ GstBuffer ** buffers, guint num_buffers,
+ guint8 * mem_nums, guint total_mem_num,
+ guint64 * bytes_written, guint64 skip);
G_END_DECLS