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PR/54973 CVS commit: src/sys/dev/audio

The following reply was made to PR kern/54973; it has been noted by GNATS.

From: "Tetsuya Isaki" <>
Subject: PR/54973 CVS commit: src/sys/dev/audio
Date: Sat, 22 Feb 2020 05:51:39 +0000

 Module Name:	src
 Committed By:	isaki
 Date:		Sat Feb 22 05:51:39 UTC 2020
 Modified Files:
 	src/sys/dev/audio: audio.c
 Log Message:
 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.
 To generate a diff of this commit:
 cvs rdiff -u -r1.42 -r1.43 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.

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