[wdmaudiodev] Vista 32 bit RTM and USB 2.0 isoch input
- From: Stephan Kappertz <stephan@xxxxxxxxxx>
- To: "wdmaudiodev@xxxxxxxxxxxxx" <wdmaudiodev@xxxxxxxxxxxxx>
- Date: Tue, 19 Dec 2006 17:58:49 +0100
Hi All,
I'm having trouble with USB 2.0 isoch input streams under Vista 32 bit RTM:
I'm submitting four URBs at streaming startup. Each URB represents 32*8
isoch packets. All URBs have the USBD_START_ISO_TRANSFER_ASAP flag set.
Every time an URB is finished, a new one gets submitted with the
USBD_START_ISO_TRANSFER_ASAP flag. This code worked fine under Win XP.
The time from submitting the USB to stream startup as monitored with an
USB analyzer was always less then 100 ms. I didn't see any hardware
problems like USBD_STATUS_ISO_NOT_ACCESSED_BY_HW or URBs marked with
USBD_STATUS_ISOCH_REQUEST_FAILED.
Now under Vista, at streaming startup I'm _always_ getting back bad
packets with USBD_STATUS_ISOCH_REQUEST_FAILED and/or almost all
IsoPackets marked with USBD_STATUS_ISO_NOT_ACCESSED_BY_HW. Even worse,
I'm getting back the bad packets after up to 2 seconds, causing a large
delay in my streaming startup routine. After submitting new URBs from
the callback for a few times I'm finally getting stable streaming.
This problem doesn't seem to be hardware related. I tried several USB
controllers with the same result. However, if isoch streams were running
before, restarting them usually causes a much smaller delay from stream
startup to stable streaming.
Any idea how to fix this issue?
Thanks,
Stephan
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