[wdmaudiodev] Re: Update for Capture Problem on WavePCI
- From: "Jeff Pages" <jeff@xxxxxxxxxxxxxxxx>
- To: <wdmaudiodev@xxxxxxxxxxxxx>
- Date: Wed, 28 May 2003 16:40:03 +1000
I've just hooked up the XP debugger, and when a recording ends Windows sets
the stream state to KSSTATE_ACQUIRE then revokes all of the outstanding
mappings in multiple calls to RevokeMappings. After that it then sets the
state to KSSTATE_STOP, so by then there aren't any mappings left to release
anyway.
Maybe you need to look more carefully at your RevokeMappings handler and
make sure it is doing the right thing.
Jeff
> Well, KSSTATE_STOP happens, usually my situation is that one of my pending
> descriptors has data, and a couple more are unused. I thought the PortCls
> driver would basically revoke them...but, it does not seem to. So, in
fact,
> I do call ReleaseMapping for all the descriptors remaining. I have tried
> several variations of this...releasing, not releasing, releasing only the
> current descriptor...but, all the options yield the same results.
>
> The problem only goes away if I use the IPreFetchOffset funtion under XP
and
> without KMixer doing sample rate conversion.
>
> Otherwise, here are some examples of what happens:
>
> At 8k any recording less than 4 seconds yields no data.
> 5 seconds yields about 4 seconds of data.
> 6 seconds yields abour 4 seconds of data.
> 10 seconds yields about 8 seconds of data
> 60 seconds yields about 57 seconds of data.
>
> I am really out of ideas...I have tried everything I can thiink of.
>
> Thank you
>
> reflecting on your email, I am not sure if I have tried releasing all the
> descriptors even the ones that have no data. I have tried waiting a little
> longer and filling the remain descriptors with data, but then I get too
much
> data.
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