Improve USB audio mixer support for USB audio class 1 and 2.

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- make sure volume controls are correctly mapped to "pcm" and "rec" depending
  on how they deliver audio to the USB host.
- make sure there are no duplicate record selections.
- remove internal only mixer class type.
- don't add software volume controls for recording only.
- some minor mixer code cleanup.

Tested by:	Horse Ma <Shichun.Ma@dell.com>
MFC after:	1 week
Sponsored by:	Mellanox Technologies

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This commit is contained in:

Hans Petter Selasky 2020-03-27 10:22:35 +00:00

parent ded22b4527

commit c2bc9ff72a

Notes: svn2git 2020-12-20 02:59:44 +00:00

svn path=/head/; revision=359355

1 changed files with 256 additions and 391 deletions

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sys/dev/sound/usb/uaudio.c

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