On 31. 08. 23 19:06, Curtis Malainey wrote:
Curtis Malainey | Chrome OS Audio Senior Software Engineer |
cujomalainey@xxxxxxxxxx | Sound Open Firmware Lead
On Sat, Aug 26, 2023 at 4:31 AM Jaroslav Kysela <perex@xxxxxxxx> wrote:
On 24. 08. 23 23:33, cujomalainey@xxxxxxxxxxxx wrote:
From: Curtis Malainey <cujomalainey@xxxxxxxxxxxx>
Provide a UCM value to mark devices which are needed to be opened only
for HW purposes but should not be consumed for userspace.
It would be probably better to describe this in the standard ALSA PCM API than
UCM. If the device is special, applications without UCM should be also allowed
to identify them.
Jaroslav
Would something like an additional device class and a format subclass
be acceptable?
The device class extension sounds good.
I don't know details for the format extension - does app require to set
hw_params ? If yes, is the goal to prevent standard applications to set the
hw_params ? If no, the format bitmask may be set to zero, thus hw_params will
always fail.
Jaroslav
--
Jaroslav Kysela <perex@xxxxxxxx>
Linux Sound Maintainer; ALSA Project; Red Hat, Inc.
