CVS commit: [netbsd-9] src

["Martin Husemann" <martin%netbsd.org@localhost>]

Module Name:    src
Committed By:   martin
Date:           Thu Apr 30 15:40:50 UTC 2020

Modified Files:
        src/share/man/man4 [netbsd-9]: audio.4
        src/sys/dev/audio [netbsd-9]: audio.c

Log Message:
Pull up following revision(s) (requested by isaki in ticket #875):

        sys/dev/audio/audio.c: revision 1.59
        share/man/man4/audio.4: revision 1.102
        share/man/man4/audio.4: revision 1.103
        sys/dev/audio/audio.c: revision 1.43

Limit the number of channels that userland apps can set (by AUDIO_SETINFO)
to the number of channels supported by the hardware or less, if the hardware
supports multi channels.
- On monaural or stereo hardware, userland apps can always set 1ch or 2ch.
  The kernel (audio layer) can convert mono-stereo each other.
- On 3ch (2.1ch) hardware, for example, userland apps can set 1, 2, or 3ch,
  but not 4ch or more.

This allows userland apps to know actual number of channels supported by
the hardware in the same way as before.

PR kern/54973.

Reinitialize the sticky parameters whenever the hardware format is changed.

When the number of the hardware channels becomes less than the number of
channels that sticky parameters remember, subsequent open("/dev/sound") will
fail without this treatment.  This is for rev 1.43.

Add description about channel limitation introduced in audio.c 1.43.
PR kern/54973.

Remove trailing whitespace.


To generate a diff of this commit:
cvs rdiff -u -r1.90 -r1.90.2.1 src/share/man/man4/audio.4
cvs rdiff -u -r1.28.2.9 -r1.28.2.10 src/sys/dev/audio/audio.c

Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.