[alsa-devel] A problem with USB audio devices and the UHCI scheduler

Clemens Ladisch clemens at ladisch.de
Wed Jul 4 15:43:04 CEST 2012

Monty Montgomery wrote:
> The device does use altsets for different sample formats and
> input/output channels, just not altsets for each sample rate (as
> supported/encouraged by the Audio Class...

Supported, but not encouraged:
| A typical use of alternate settings is to provide a way to change
| the bandwidth requirements an active AudioStreaming interface
| imposes on the USB.

> Is it really the case that other Audio Class devices never make use
> of the "multiple sample rates in an altset" feature?

They do, but not when bandwidth matters.


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