I’m developing a WDM audio driver under portcls.sys. At first, I asked
this in wdmaudiodev but there are almost no active members in that forum 
My driver sometimes receives a new stream requests with
format descriptor seems to be erratic. In both cases, it’s a fully
valid WAVEFORMATEXTENSIBLE structure with KSDATAFORMAT_SUBTYPE_PCM. In
one case, the Format.wFormatTag is zero. In other case,
Samples.wValidBitsPerSample is zero. All other members seems to be
correct.
In both cases, requests come from the sysaudio (from a system
process).
Must I accept these requests and get missing values from other
descriptor fields or I can reject them?
Regards,
Eugene
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