Hello,
I have got one question concerning your issu: What does
IOCTL_KS_READ_STREAM return? Does the IOCTL fail? What windows error
code do you get with GetLastError if the IOCTL returns the buffer
immediately? 0x57 == Invalid Parameter?
Uwe Kirst
Olivier Roblin wrote:
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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