[wdmaudiodev] Re: Fixed - Capture audio from USB Audio Device on XP (SP2)
- From: "Edwin van den Oosterkamp" <edwin@xxxxxxxxx>
- To: <wdmaudiodev@xxxxxxxxxxxxx>
- Date: Tue, 21 Feb 2006 16:30:57 -0000
Hello All,
Many thanks to the people who replied to my query - my kernel-streaming problem
with USB Audio on XP has been fixed. This was mainly thanks to this question
from Jerry Evans:
> When capturing do you first set the pin state to KSSTATE_PAUSE and then
> KSSTATE_RUN?
That question made me decide to play around with different pausing and running
schemes.
The working solution is:
- I create the capturing pin with a WAVEFORMATEX structure (48kHz, 2 channels,
16bits).
- The pin state is set to KSSTATE_PAUSE.
- I prepare a couple of KSSTREAM_HEADER and OVERLAPPED structs.
- The (auto reset) events are created and filled in in the OVERLAPPED structs.
- The pin state is set to KSSTATE_RUN.
- The KSSTREAM_HEADERs are handed over to the pin together with a matching
OVERLAPPED.
The only difference with the problem version is the setting of the paused state.
Best regards,
Ing. Edwin van den Oosterkamp
R&D, MDO UK
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