Andrew, No specific reason I can point to would add to the latency of the capture when simultaneously rendering. My best guess is overhead due to the use of use of multiple endpoints at one time but that is just a guess. I will need to experiment to verify this. DJ Sisolak Microsoft Corp. This posting is provided "AS IS" with no warranties, and confers no rights. -----Original Message----- From: wdmaudiodev-bounce@xxxxxxxxxxxxx [mailto:wdmaudiodev-bounce@xxxxxxxxxxxxx] On Behalf Of Andrew Sherbrooke Sent: Wednesday, June 25, 2003 10:56 AM To: wdmaudiodev@xxxxxxxxxxxxx Subject: [wdmaudiodev] Re: Capture latency with USB card Hi DJ, >In the USB Audio driver as it exists in XP you can expect at least a >latency of 10 ms by design plus whatever time it takes to do the data >copy to the submitted buffers. The explanation makes sense to me; thanks. Is there any reason why one might expect the numbers to be higher when render and capture are combined? It seemed tighter when I just hooked up one direction, but there may have been factors beside usbaudio.sys... Sincerely, Andrew Sherbrooke Art & Logic Lead Engineer, Audio/Media Development asher@xxxxxxxxxxxx www.artlogic.com (425) 844-8607 ****************** WDMAUDIODEV addresses: Post message: mailto:wdmaudiodev@xxxxxxxxxxxxx Subscribe: mailto:wdmaudiodev-request@xxxxxxxxxxxxx?subject=subscribe Unsubscribe: mailto:wdmaudiodev-request@xxxxxxxxxxxxx?subject=unsubscribe Moderator: mailto:wdmaudiodev-moderators@xxxxxxxxxxxxx URL to WDMAUDIODEV page: http://www.wdmaudiodev.de/ ****************** WDMAUDIODEV addresses: Post message: mailto:wdmaudiodev@xxxxxxxxxxxxx Subscribe: mailto:wdmaudiodev-request@xxxxxxxxxxxxx?subject=subscribe Unsubscribe: mailto:wdmaudiodev-request@xxxxxxxxxxxxx?subject=unsubscribe Moderator: mailto:wdmaudiodev-moderators@xxxxxxxxxxxxx URL to WDMAUDIODEV page: http://www.wdmaudiodev.de/
