Modifies a pointer to a GstBuffer to point to a different GstBuffer. The
modification is done atomically (so this is useful for ensuring thread safety
in some cases), and the reference counts are updated appropriately (the old
buffer is unreffed, the new is reffed).
Either nbuf or the GstBuffer pointed to by obuf may be NULL.
Modifies a pointer to a GstBuffer to point to a different GstBuffer. The modification is done atomically (so this is useful for ensuring thread safety in some cases), and the reference counts are updated appropriately (the old buffer is unreffed, the new is reffed). Either nbuf or the GstBuffer pointed to by obuf may be NULL.