[alsa-devel] Question on USB Audio delay calculations

Hi Takashi,

I have a question regarding reporting of the "delay" in the USB audio driver.

While starting the endpoint from "prepare" (snd_usb_endpoint_start) for playback operation, it submits empty URBs but it doesn't take them into account for "delay". When the start comes from user, the new URB won't get submitted until the previous one completes, so shouldn't we increment the delay when we submit the empty URBs before the actual start has come, because it does contribute to "delay".

I can submit the patch, if my understanding is right.

Regards, Rakesh