[Bug 281390] sound: OSS have no AFMT_FLOAT support

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=281390

            Bug ID: 281390
           Summary: sound: OSS have no AFMT_FLOAT support
           Product: Base System
           Version: Unspecified
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: kern
          Assignee: bugs@FreeBSD.org
          Reporter: rozhuk.im@gmail.com

Past issues:
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=157050
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=184380

In the wild some software from ports that have OSS support just define
AFMT_FLOAT inside own code.

AFMT_FLOAT used in wine:
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=264973
Currently as workaround wine builds with ALSA.


I suggest to add some in kernel conversion from AFMT_FLOAT to some thing that
aleady support by "PCM subsystem mixing through its feeder subsystem" or update
feeder subsystem to support AFMT_FLOAT.

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