period time in async handler

[Tim Pushor <timp@crossthread.com>]

Hi Friends,

I have a need to have an audio player kick off things at various points 
of time through playback of an audio file. I'm trying to hack aplay as a 
proof of concept.

If I understand correctly, the asynchronous handler seems to do what I 
want. I hacked in a handler to aplay and it works, but not quite like 
how I expected.

I counted the number of times that the handler got called, and thought 
that if I multiplied that by the period time that I'd end up with the 
total audio length but that doesn't seem to be the case. I was under the 
assumption that the handler was called once per period.

I must not understand the relationship of the asynchronous handler and 
period_time. Does this make sense? Am I going about this all wrong?

Thanks,
Tim