[alsa-devel] Buffer size for ALSA USB PCM audio

[Clemens Ladisch]

Pavel Hofman wrote:
> On 27.8.2013 09:19, Clemens Ladisch wrote:
>> The driver cannot control how many samples actually end up in a capture
>> packet,...
>
> Does this reasoning apply to asynchronous playback too?

No.

> I understand the driver has some control, but has to satisfy the endpoint
> feedback requests.

When the driver wants to submit a playback URB, it knows how many
samples it is copying into the packets.  (There is a delay between the
device reporting its desired rate and the driver actually using it.)


Regards,
Clemens