[wdmaudiodev] Looped capture buffers with WaveCyclic/WavePci drivers
- From: Eugene Muzychenko <emuzychenko@xxxxxxxxx>
- To: wdmaudiodev@xxxxxxxxxxxxx
- Date: Fri, 30 Jan 2009 19:17:50 +0600
Hello!
I want to implement audio capture in a looped mode
(KSINTERFACE_STANDARD_LOOPED_STREAMING). For render pins, looped mode
works fine. But when I send IOCTL_KS_READ_STREAM with
KSSTREAM_HEADER_OPTIONSF_LOOPEDDATA flag, I always get
ERROR_INVALID_PARAMETER. Tracing IRP processing, I see PortCls returns
STATUS_INVALID_PARAMETER.
MSDN Library does not distinguish between render and capture pins in
KSSTREAM_HEADER_OPTIONSF_LOOPEDDATA description. This flag works fine
with render pins but does not work with capture pins for some reason.
Are some special conditions required to use a looped capture buffer or
PortCls does not support it at all? If second, why PortCls exposes
KSINTERFACE_STANDARD_LOOPED_STREAMING interface together with the
KSINTERFACE_STANDARD_STREAMING for all capture pins?
Regards,
Eugene
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