timestamps for usb audio device
timestamps for usb audio device
- Subject: timestamps for usb audio device
- From: Jeff Schindler <email@hidden>
- Date: Wed, 12 May 2010 13:33:36 -0400
We have a driver for a USB audio device which is experiencing some glitchy audio (clicks/pops). The most likely candidate appears to be our timestamp generation - we are generating the timestamps using machine time. We do our data copying on input on a CoreAudio timer, which is when we detect the ring buffer wrap and take the timestamp. HALLab does detect some bad timestamps, but those detections don't necessarily correlate with the glitches we are detecting (both audibly and via a scope). First off, should the reported bad timestamps in HALLab (red lines) correspond to audible glitches and will HALLab necessarily report all bad timestamps generated? Secondly, is the most likely culprit of our glitchy audio timestamp related and, if so, what things might we try to correct it? Thanks for any help. _______________________________________________
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