[wdmaudiodev] Re: AVStream for audio - change of direction?
- From: Eugene Gavrilov <egavrilov@xxxxxxxxxxxxx>
- To: Matt Gonzalez <wdmaudiodev@xxxxxxxxxxxxx>
- Date: Fri, 30 Jun 2006 01:47:09 +0400
Hi Matt,
> It is possible to create audio subdevices dynamically with AVStream - in
> addition to KsCreateFilterFactor, you may also need to call
> KsFilterFactorySetDeviceClassesState for things to work properly. You
> may also need to create the appropriate WDM interface.
Oops. When I tried to implement dynamic subdevices, I faced an issue
with KsCreateFilterFactory: it did not update the list of devices...
Will try to use KsFilterFactorySetDeviceClassesState now! One more
blank page in AVStream documentation...
> It is a fair amount of pain because there aren't any samples. At the
> end of the day, you end up creating a filter that looks the same as it
> would with PortCls. You also have to add support for things like
> KSPROPERTY_AUDIO_POSITION yourself, instead of PortCls doing it for you.
By the way, why is it necessary to implement
KSPROPERTY_AUDIO_POSITION? Our FW driver seems to work fine without
this call. (In WinMM/DSound modes). Although this might be the reason
for 'ASIO Multimedia driver' to fail...
--
By the way, have you ever got a chance to try DESCRIPTOR_SYNCH_ON_TIME
and RESOURCE_SYNCH_ON_TIME flags? We require them for correct
multidevice synchronization, but this seems to cause unpredictable
results and delays.
Regards,
Eugene Gavrilov
Software Engineer,
CEntrance, Inc.
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