waveOutWrite() queue before fill question

[Ross Bencina]

Hello all,

On the topic of windows multimedia audio i/o...

I have been experimenting with filling my waveOut buffers AFTER I have 
requeued them to the driver (with waveOutWrite) as this seems to allow  
me to use double buffers (as opposed to 3 or more) while using a large 
percentage of the buffer time slice (90%+). My earlier experiments only 
yielded a 50% usable slice - ie the buffers needed to be delivered 
approximately half a buffer duration before they were required to 
provide glitch free output.

These test were performed using 2048 byte buffers on a PII 266, win95 
and a wavecenter card that gives Systems Monitor stats on buffer 
underruns and other useful stuff.

Other than the fact that it's not recommended, can anyone comment on 
whether there is any time when this strategey wouldn't work? NT or 
certain drivers for example?

Note that I always have the whole buffer filled before I expect it to 
start playing.

Ross B.

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