Oh yes, of course, I think that post was on the ntdev mailing list. Sorry. But these are some problems I have encountered: - inverted callbacks. The callbacks for my isoch descriptors are sometimes being called in the wrong order. - problems at high speed. I can't really testify with that one but we've had problems streaming isoch at around 100Mbps. We've fixed that and the only significant thing that was changed was the circular buffers. Not only did I experience those problems but I was told that Microsoft has admitted there was something broken in the circular buffers and simply recommended not to use them. Mathieu Routhier -----Original Message----- From: BlazeAudio Developer [mailto:developer@xxxxxxxxxxxxxx] Sent: Friday, March 28, 2003 8:11 PM To: wdmaudiodev@xxxxxxxxxxxxx Subject: [wdmaudiodev] Re: Why windows Me is different from Win98 & Wi ndows 2K/XP Mathieu, I cannot locate that post from Bill McKenzie. I have been using them quite successfully, for quite some time now. What is the nature of the problem? Thanks. Devendra. At 05:42 AM 3/27/2003, Mathieu Routhier wrote: Watch out!! The circular buffers in the 1394 drivers are broken, as Bill McKenzie pointed out in a fairly recent post. I can confirm that there is really a problem with them, even in XP SP1. Actually, you will notice that the flag is not documented anymore in the DDK... Mathieu Routhier -----Original Message----- From: BlazeAudio Developer [mailto:developer@xxxxxxxxxxxxxx[1]] Sent: Wednesday, March 26, 2003 6:12 PM To: wdmaudiodev@xxxxxxxxxxxxx; wdmaudiodev@xxxxxxxxxxxxx Subject: [wdmaudiodev] Re: Why windows Me is different from Win98 &Windows 2K/XP Perhaps DJ can provide more detailed information, but I'm suspecting that the USB Audio Driver is writing the data in the buffers *after* it submits the buffers to the USBD. Or could it be possible that the USBD now supports "cyclic" isoch. buffers (like the 1394.sys does) allowing a client to send a request once, and then keep on refilling the same buffers? Thanks. Devendra. At 05:32 PM 3/24/2003, Srinivasa Deevi wrote: Hi all I have to modify the USB data that is coming from microsoft USB audio driver and convert to different format before sending to our device. The concept works fine in Windows 98 and Windows 2K, XP with out any problem . In case of windows Me , when the Transfer buffer of URB request contains Zeros always . If I don't touch the data buffer in URB then I can see some data coming out of Iso pipe . And I don't see any problem when I am sending the data up through Iso IN pipe. The problem occurs only on Iso OUT pipe . Thinking that it could be related to "realtime " mixing capabilities of WinMe, I checked for all the IOCTLs that are coming for USB audio . But I could never find any request that is related to "real time" as shown below. " This indeed is happening because of the "realtime" negotiation that happens between kmixer and usbaudio. To circumvent this behavior, you should fail the property KSPROPERTY_RTAUDIO_GETPOSITIONFUNCTION in the property set KSPROPSETID_RtAudio. #define STATIC_KSPROPSETID_RtAudio\ 0xa855a48c, 0x2f78, 0x4729, 0x90, 0x51, 0x19, 0x68, 0x74, 0x6b, 0x9e, 0xef DEFINE_GUIDSTRUCT("A855A48C-2F78-4729-9051-1968746B9EEF", KSPROPSETID_RtAudio); #define KSPROPSETID_RtAudio DEFINE_GUIDNAMED(KSPROPSETID_RtAudio) typedef enum { KSPROPERTY_RTAUDIO_GETPOSITIONFUNCTION } KSPROPERTY_RTAUDIO; This is a private interface between kmixer and usbaudio, there is no guarantees that this won't change in the future. Please only override this functionality in extreme cases. Without this interface, the performance of usbaudio is severely impacted." Am I missing something here or where should I check exactly check or modify the real time settings for Windows me . thanks in advance sri. __________________________________________________ Do you Yahoo!? Yahoo! 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