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Ricardo Biehl Pasquali c848ea519f corrected (over/under)run definition in pcm.h 
overrun is in capture and underrun is in playback.
Look:

'+' has data / '-' hasn't data

overrun (capture):

 You should have
 read until here
                v
        |+++++++|++     <- buffer over(run/flow)

underrun (playback):

 You should have
 written until here
                   v
           |+++++++|--  <- buffer under(run/flow)
2016-12-28 14:42:18 -02:00
..
tinyalsa
corrected (over/under)run definition in pcm.h
2016-12-28 14:42:18 -02:00