[wdmaudiodev] Re: DirectKS not working properly on XP with an USB device
- From: Maciej Cieślak <m.cieslak@xxxxxxxxxxx>
- To: wdmaudiodev@xxxxxxxxxxxxx
- Date: Fri, 25 Jun 2010 19:26:50 +0200
2010/6/25 Tim Roberts <timr@xxxxxxxxx>:
> Maciej Cieślak wrote:
>> I am developing an application that plays audio on an USB device using
>> Kernel Streaming. This program is designed to work with one specific
>> device.
>> When I am using the DirectKS sample (slightly modified to pick the
>> right device) on Vista or 7, everything works properly. However, on XP
>> I experience some serious problems: the packets are returned not in
>> order and irregularly.
>>
>
> We can't diagnose this with the information you have provided. A big
> part depends on how you have coded the application. Buffers are always
> completed in order, but once they get to your application, anything can
> happen, especially with a multithreaded app on a multicore processor.
>
This is a standard DirectKS sample compiled with VS2010 (I have also
checked VS2008).
On Vista/7 after I set the pin state to KSSTATE_RUN the it gives me output:
0.115: Pin state is KSSTATE_STOP
2.695: Setting Pin to KSSTATE_RUN ...
2.698: Packet 0 is available... Submitting packet 0
2.700: Packet 1 is available... Submitting packet 1
2.702: Packet 2 is available... Submitting packet 2
2.704: Packet 3 is available... Submitting packet 3
2.955: Packet 0 is available... Submitting packet 0
3.205: Packet 1 is available... Submitting packet 1
3.455: Packet 2 is available... Submitting packet 2
3.705: Packet 3 is available... Submitting packet 3
etc. and I hear the sine wave.
The same sample on Windows XP outputs this when setting the pin state
to KSSTATE_RUN:
0.079: Pin state is KSSTATE_STOP
2.500: Setting Pin to KSSTATE_RUN ...
2.532: Packet 0 is available... Submitting packet 0
2.532: Packet 1 is available... Submitting packet 1
2.532: Packet 2 is available... Submitting packet 2
2.547: Packet 3 is available... Submitting packet 3
When I press KSSTATE_RUN again, I get:
3.594: Packet 0 is available... Submitting packet 0
3.656: Packet 1 is available... Submitting packet 1
3.656: Packet 2 is available... Submitting packet 2
3.656: Packet 3 is available... Submitting packet 3
3.703: Packet 0 is available... Submitting packet 0
3.797: Packet 1 is available... Submitting packet 1
4.063: Packet 0 is available... Submitting packet 0
4.063: Packet 2 is available... Submitting packet 2
4.063: Packet 3 is available... Submitting packet 3
4.453: Packet 1 is available... Submitting packet 1
4.719: Packet 2 is available... Submitting packet 2
4.844: Packet 0 is available... Submitting packet 0
so the packet events are not called in order (0, 1, 2, 3) and the
sound I hear is not constant, the sine wave is interrupted many times.
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