[pulseaudio-discuss] alsa sink latency - how to account for startup delay

[Raymond Yau]

>
> when a sink is started, there is some delay before the first sample is
really played.
> This delay is a constant part of the sink latency that will be always
present, so the
> minimum sink latency cannot go below that start delay.
> Would it be acceptable to adjust the latency range for the device after
each unsuspend
> to reflect that?
> USB devices (those I have access to) for example have a startup delay in
the range of
> 10ms, but have a latency range that starts at 0.5ms which does not make a
lot of sense
> in my opinion.
> The startup delay is not constant, so the minimum possible latency would
vary.
>
> On the source side the startup delay is not relevant since it does not
delay the signal.
>

https://git.kernel.org/cgit/linux/kernel/git/tiwai/sound.git/commit/sound/usb?id=976b6c064a957445eb0573b270f2d0282630e9b9

https://git.kernel.org/cgit/linux/kernel/git/tiwai/sound.git/commit/sound/usb?id=adc8d31326c32a2a1e145ab80accbc3c6570b117

As pulseaudio alsa i/0 thrread based on avail to update alsa buffer, those
submitted urbs cannot be rewinded, it is just similar to FIFO of hda
controller
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