[alsa-devel] [PATCH 1/2] ALSA: usb-audio: ignore delay calculation for capture stream

[Pierre-Louis Bossart]

>>> It doesn't make sense to calculate the delay for capture streams in
>>> the current implementation.  It's always zero, so we should skip the
>>> computation in snd_usb_pcm_pointer() in the case of capture.
>>
>> Shouldn't we add support for delay on the capture path instead? We could
>> use the same frame counter to report the delay and resync when the urb
>> is retired.
>
> Sure, it must be possible like that way.
> Wouldn't you like to volunteer? ;)

Sounds like a good skunkworks for the end of the year...If we have both 
HDA and USB behaving correctly on delays, this would raise the bar for 
everyone.