osx - LowLatencyWriteIsochPipeAsync transfer completed early? -


i submit isochronous usb transfer on osx using lowlatencywriteisochpipeasync() frame ...844. current bus frame ...829 transfer should begin 15 frames (15 ms) in future. length of transfer 64 frames (64 ms) expect completion callback called no earlier 64+15 = 79 ms when submitted.

in fact, completion callback called 55 ms after submitted! that's not long enough transfer complete if started immediately. going on?


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