avfvideosrc: Report latency when doing screen capture
There is no device
when doing screen capture, but there is always an
input
, so use that to decide when we can reply to a latency query.
Without this, the latency query just fails.
There is no device
when doing screen capture, but there is always an
input
, so use that to decide when we can reply to a latency query.
Without this, the latency query just fails.