For various use-cases a passthrough stream should have priority over all
other streams and get exclusive access to the sink regardless of whether
any other streams are playing.
An example use-case is ensuring XBMC can successfully start video
playback (with passthrough) even if an external notification sound
happened to be playing at the same time.
While the code makes sense, I am wondering if this is the right
solution. This would typically need to be handled by a policy framework
instead of making hard-coded decisions? what if you get a ringtone, do
you really want to keep playing your video? At the very least there
should be a whitelist set of stream types that have higher precedence
than pass-through and that don't get routed to the null sink (could be
passed as options to the module)
-Pierre
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