* The default implementation will copy the flags, timestamps and
* offsets of the buffer.
* @transform_meta: Optional. Transform the metadata on the input buffer to the
- * output buffer. By default this method is %NULL and no
- * metadata is copied. subclasses can implement this method and
- * return %TRUE if the metadata is to be copied.
+ * output buffer. By default this method copies all meta without
+ * tags. subclasses can implement this method and return %TRUE if
+ * the metadata is to be copied.
* @before_transform: Optional.
* This method is called right before the base class will
* start processing. Dynamic properties or other delayed