Date: Sat, 31 May 1997 07:44:42 -0400 From: Randall Hopper <rhh@ct.picker.com> To: Chuck Robey <chuckr@glue.umd.edu> Cc: FreeBSD-multimedia@FreeBSD.ORG Subject: Re: Audio devices Message-ID: <19970531074442.47236@ct.picker.com> In-Reply-To: <Pine.BSF.3.91.970530214452.364V-100000@Journey2.mat.net>; from Chuck Robey on Fri, May 30, 1997 at 09:45:42PM -0400 References: <Pine.BSF.3.91.970530214452.364V-100000@Journey2.mat.net>
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Chuck Robey:
|Does anyone know what the absolute reference is for the major and minor
|numbers for the audio devices, like /dev/audio, dsp, dsp0, midi, music, etc?
|
|I am not looking for the numbers, I can go do an ls -l of my /dev for
|that. I'm trying to find the definitive guide for them. If I can get a
Well, this may or may not be acclaimed as the definitive guide
anymore, but I have a PostScript copy of Hannu Savolainen's "Hacker's Guide
to VoxWare 2.4, second draft" that has this table and subsequent text:
Device Minor Multi
mixer 0 yes
sequencer 1 no
midi 2 yes
dsp 3 yes
audio 4 yes
dsp16 5 yes
sndstat 6 no
(unused) 7 no
sequencer2 8 no
Table 0.1: Minor number assignment of the device files
...
The minor number assign ment is given in the table 0.1. The four
least significant bits of the minor number are used to select the
device file type or class. If there is more than one devices in
this class, the upper 4 bits are used to select the device. For
example the class number of the /dev/dsp is 3. Then the minor
number of /dev/dsp is 3 + 16 * 0 = 3 and the /dev/dsp1 is 3 + 16
* 1 = 19.
Seeing as how our Voxware drivers are dated May 6, 1995, and the docs are
dated Feb 21, 1994 and describe features up-and-coming for 3.0, it makes
sense that this is a close match.
BTW, it holds for my card (Sound Blaster 32), except that sequencer2 is
called music0, and there's and extra pss0 on minor 9.
Randall
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