On 2020-03-31 14:35, Alexander Leidinger via freebsd-usb wrote:
Quoting Hans Petter Selasky <hsela...@freebsd.org> (from Mon, 30 Mar
2020 16:50:33 +0000 (UTC)):
Author: hselasky
Date: Mon Mar 30 16:50:32 2020
New Revision: 359446
URL: https://svnweb.freebsd.org/changeset/base/359446
Log:
Add support for multiple playback and recording devices per physical
USB audio
device. This requires some structural refactoring inside the driver,
mostly
about converting existing audio channel structures into arrays.
The main audio mixer is provided by the first PCM instance.
The non-first audio instances may only have a software mixer for PCM
playback.
Have you thought about providing different pcm devices per physical USB
audio device for the functionality of dev.pcm.X.Y.vchanformat /
vchanrate? Incompatible configs between those devices could be prevented
at runtime via setting all the incompatible devices per physical device
to return EBUSY or such while one of the group is open / in use.
/dev/sndstat could also contain some kind of status to this effect and
to which group of pcm devices pcmX belongs.
Hi,
There will be two pcm devices, belonging to the same uaudioX device
having each their independent sysctl tree. So you get:
/dev/dsp0
/dev/mixer0
/dev/dsp1
/dev/mixer1
mixer1 only controls dsp1, and mixer0 only controls dsp0, while it may
be the same physical USB audio device.
Was this your question?
--HPS
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