[wdmaudiodev] Re: Direct KS question
- From: "Olivier Roblin" <oroblin@xxxxxxxxxxxx>
- To: <wdmaudiodev@xxxxxxxxxxxxx>
- Date: Thu, 10 Jun 2004 09:45:27 +0200
I've already noticed something like this...But, as I didn't really need it,
I decided not using this SRate anymore...but I'm still interested in the
solution.
Olivier Roblin
> -----Message d'origine-----
> De : wdmaudiodev-bounce@xxxxxxxxxxxxx
> [mailto:wdmaudiodev-bounce@xxxxxxxxxxxxx]De la part de Andrew Sherbrooke
> Envoyé : jeudi 10 juin 2004 01:13
> À : wdmaudiodev@xxxxxxxxxxxxx
> Objet : [wdmaudiodev] Direct KS question
>
>
> Hi all,
>
> I have a Direct KS user process which speaks to USBAudio.sys. It uses
> rings of buffers for input and output, submitting them via
> DeviceIoControl, using IOCTL_KS_WRITE_STREAM and IOCTL_KS_READ_STREAM. It
> then waits for one of the associated events to become signaled by calling
> WaitForMultipleObjects().
>
> Everything works great until we set it up to use 96 kHz stereo input
> (we're not using output at that rate, because of bandwidth limitations, so
> it's just waiting on the input buffers). However the
> WaitForMultipleObjects() call returns immediately, causing our process to
> basically spin in a tight loop, never getting valid data. Occasionally it
> will work fine, but most of the time it behaves as described. Output at 96
> kHz works. Both directions together work at 44.1 and 48. It appears that
> input even works alone at 88.2 (although I haven't tested this
> exhaustively), and again, infrequently, it works at 96 kHz. Has anyone
> seen anything like this? Are there known problems with USBAudio.sys at
> these higher rates, perhaps (Windows XP Pro, current release)? Thanks very
> much!
>
> Sincerely,
>
> Andrew Sherbrooke
>
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