NetBSD Problem Report #42016
From jmcneill@pipes.invisible.ca Tue Sep 8 11:41:23 2009
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Date: Tue, 8 Sep 2009 07:42:37 -0400 (EDT)
From: jmcneill@invisible.ca
Reply-To: jmcneill@invisible.ca
To: gnats-bugs@gnats.NetBSD.org
Subject: audio(4) does not handle formats where validbits!=precision
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>Number: 42016
>Category: kern
>Synopsis: audio(4) does not handle formats where validbits!=precision
>Confidential: no
>Severity: serious
>Priority: high
>Responsible: kern-bug-people
>State: open
>Class: sw-bug
>Submitter-Id: net
>Arrival-Date: Tue Sep 08 11:45:00 +0000 2009
>Last-Modified: Tue Nov 07 21:38:47 +0000 2017
>Originator: Jared D. McNeill
>Release: NetBSD 5.99.16
>Organization:
>Environment:
System: NetBSD pipes.invisible.ca 5.99.16 NetBSD 5.99.16 (MONOLITHIC) #54: Tue Sep 8 07:15:49 EDT 2009 jmcneill@ptichka.invisible.ca:/Users/jmcneill/branches/HEAD/src/sys/arch/i386/compile/obj/MONOLITHIC i386
Architecture: i386
Machine: i386
>Description:
From audiosetinfo():
if (SPECIFIED(p->precision)) {
pp.precision = p->precision;
/* we don't have API to specify validbits */
pp.validbits = p->precision;
np++;
}
This means that if hardware supports eg. 20- or 24-bit samples in
32-bit containers, userland has no way to select this.
In theory the hardware driver should be able to set
precision=validbits (so eg. 24-bit samples in 24-bit containers) and
implement its own audio filter for linear24_to_linear32 conversion,
but attempts to make this work have been unsuccessful. Maybe it needs
the following change from OpenBSD:
http://www.openbsd.org/cgi-bin/cvsweb/src/sys/dev/audio.c#rev1.101
A few thoughts;
1. For eg. 24-bit samples, is it more likely that userland will supply
a 24/24 or 24/32 stream?
2. Extending AUDIOSETINFO is not desirable, and OSS compatibility
should also be taken into account.
>How-To-Repeat:
>Fix:
>Release-Note:
>Audit-Trail:
Responsible-Changed-From-To: kern-bug-people->nat
Responsible-Changed-By: nat@NetBSD.org
Responsible-Changed-When: Sat, 04 Nov 2017 07:26:49 +0000
Responsible-Changed-Why:
Take.
From: Tetsuya Isaki <isaki@pastel-flower.jp>
To: gnats-bugs@NetBSD.org, nat@NetBSD.org
Cc: kern-bug-people@netbsd.org,
netbsd-bugs@netbsd.org,
gnats-admin@netbsd.org,
jmcneill@invisible.ca
Subject: Re: kern/42016 (audio(4) does not handle formats where validbits!=precision)
Date: Sat, 04 Nov 2017 16:46:48 +0900
At Sat, 4 Nov 2017 07:26:50 +0000 (UTC),
nat@NetBSD.org wrote:
> Synopsis: audio(4) does not handle formats where validbits!=precision
>
> Responsible-Changed-From-To: kern-bug-people->nat
> Responsible-Changed-By: nat@NetBSD.org
> Responsible-Changed-When: Sat, 04 Nov 2017 07:26:49 +0000
> Responsible-Changed-Why:
> Take.
nat@,
This is not a simple technical problem. I'd like to know about
the direction for this problem before you implement it.
---
Tetsuya Isaki <isaki@pastel-flower.jp / isaki@NetBSD.org>
Responsible-Changed-From-To: nat->kern-bug-people
Responsible-Changed-By: nat@NetBSD.org
Responsible-Changed-When: Tue, 07 Nov 2017 21:38:47 +0000
Responsible-Changed-Why:
This is more envolved than I initially thought.
>Unformatted:
(Contact us)
$NetBSD: query-full-pr,v 1.39 2013/11/01 18:47:49 spz Exp $
$NetBSD: gnats_config.sh,v 1.8 2006/05/07 09:23:38 tsutsui Exp $
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