[Bug 252761] multichannel USB audio device reports only 2 channels via SNDCTL_AUDIOINFO

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=252761

--- Comment #10 from commit-hook@FreeBSD.org ---
A commit in branch main references this bug:

URL:
https://cgit.FreeBSD.org/src/commit/?id=e07f9178502b7cbc0769fc10e99ad0d013f437fd

commit e07f9178502b7cbc0769fc10e99ad0d013f437fd
Author:     Christos Margiolis <christos@FreeBSD.org>
AuthorDate: 2024-05-23 00:57:04 +0000
Commit:     Christos Margiolis <christos@FreeBSD.org>
CommitDate: 2024-05-23 00:57:04 +0000

    sound: Separate implementations for SNDCTL_AUDIOINFO[_EX] and
SNDCTL_ENGINEINFO

    FreeBSD's implementation of SNDCTL_AUDIOINFO[_EX] and SNDCTL_ENGINEINFO
    does not exactly work as intended. The problem is essentially that both
    IOCTLs return the same information, while in fact the information
    returned currently by dsp_oss_audioinfo() is what _only_
    SNDCTL_ENGINEINFO is meant to return.

    This behavior is also noted in the OSS manual [1] (see bold paragraph in
    "Audio engines and device files" section), but since e8c0d15a64fa
    ("sound: Get rid of snd_clone and use DEVFS_CDEVPRIV(9)") we can
    actually fix this, because we now expose only a single device for each
    soundcard, and create the engines (channels) internally.
    SNDCTL_ENGINEINFO will now report info about all channels in a given
    device, and SNDCTL_AUDIOINFO[_EX] will only report information about
    /dev/dspX.

    To make this work, we also have to modify the SNDCTL_SYSINFO IOCTL to
    report the number of audio devices and audio engines correctly.

    While here, modernize the minimum and maximum channel counting in both
    SNDCTL_AUDIOINFO[_EX] and SNDCTL_ENGINEINFO. Currently these IOCTLs will
    report only up to 2 channels, which is no longer the case.

    [1] http://manuals.opensound.com/developer/SNDCTL_AUDIOINFO.html

    PR:             246231, 252761
    Sponsored by:   The FreeBSD Foundation
    MFC after:      1 day
    Reviewed by:    dev_submerge.ch
    Differential Revision:  https://reviews.freebsd.org/D45164

 sys/dev/sound/pcm/dsp.c   | 179 +++++++++++++++++++++++++++++++++++++++++-----
 sys/dev/sound/pcm/dsp.h   |   3 +-
 sys/dev/sound/pcm/mixer.c |   8 ++-
 sys/dev/sound/pcm/sound.c |   8 +--
 4 files changed, 173 insertions(+), 25 deletions(-)

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