Hi Rob,
This BSD code does WaveRT, no idea if it handles polled mode. http://code.google.com/p/cmediadrivers/
ATB
Jerry
On 25/03/2011 18:04, Robert Bielik wrote:
Dear
all,
With a weird sequence of events, my soundcard went from WaveRT
with notifications to WaveRT no-notifications (with a Vista
update, great job...). Being as it is,
I need now to implement the poll-mode of WaveRT, however I have a
hard time getting the poll thread to be stable (I assume), even
though
the entire buffer is 4096 bytes (= 1024 frames or 23.2 ms).
Thread is running in MMCSS PA_AVRT_PRIORITY_CRITICAL level and I
just output a 440Hz sine wave, but get a lot of pops/clicks, tried
with
two sync methods, WaitForSingleObject with 5 ms timeout and
timeSetEvent notifying an event at 5 ms periodicity.
The position to write from is calculated as positionRegister +
hwLatency + (10 ms worth of write ahead), and care is taken at
buffer
boundaries.
Any ideas? Perhaps some reference implementation somewhere ? :)
(obviously the audiosrv manages to do it...)
TIA
/Rob
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