This patch is motivated by Obduction, which creates a Media Foundation source
and leaves it open arbitrarily long before actually reading samples from it.
Without this patch, we unnecessarily waste CPU, and may reduce graphical
performance by taking CPU time that would otherwise be used on
performance-critical threads.
Signed-off-by: Zebediah Figura <zfigura@codeweavers.com>
Signed-off-by: Alexandre Julliard <julliard@winehq.org>