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Update, reflecting added multichannel playback support.

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This commit is contained in:
Alexander Motin 2010-01-12 17:50:26 +00:00
parent 0ae739d6b2
commit 329fe20011
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=202160
1 changed files with 8 additions and 4 deletions
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12
share/man/man4/snd_hda.4
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@ -25,7 +25,7 @@
.\" .\"
.\" $FreeBSD$ .\" $FreeBSD$
.\" .\"
.Dd November 13, 2009 .Dd January 12, 2010
.Dt SND_HDA 4 .Dt SND_HDA 4
.Os .Os
.Sh NAME .Sh NAME
@ -125,12 +125,14 @@ such as
.Dq Li nofixedrate , .Dq Li nofixedrate ,
will do the opposite and takes precedence. will do the opposite and takes precedence.
Options can be separated by whitespace and commas. Options can be separated by whitespace and commas.
.Pp
.Dq Li GPIO Ns s .Dq Li GPIO Ns s
are a codec's General Purpose I/O pins which system integrators sometimes are a codec's General Purpose I/O pins which system integrators sometimes
use to control external muters, amplifiers and so on. use to control external muters, amplifiers and so on.
If you have no sound, or sound volume is not adequate, you may have to If you have no sound, or sound volume is not adequate, you may have to
experiment a bit with the GPIO setup to find the optimal setup for your experiment a bit with the GPIO setup to find the optimal setup for your
system. system.
.Pp
The The
.Dq Li ivref Ns Ar X .Dq Li ivref Ns Ar X
and and
@ -178,6 +180,11 @@ A unique, per-association number used to order pins inside the
particular association. particular association.
Sequence numbers can be specified as numeric values from 0 to 15. Sequence numbers can be specified as numeric values from 0 to 15.
.Pp .Pp
For output assotiations sequence numbers encode speaker pairs positions:
0 - Front, 1 - Center/LFE, 2 - Back, 3 - Front Wide Center, 4 - Side.
Standard combinations are: (0) - Stereo; (0, 2), (0, 4) - Quadro;
(0, 1, 2), (0, 1, 4) - 5.1; (0, 1, 2, 4) - 7.1.
.Pp
The sequence number 15 has a special meaning for output associations. The sequence number 15 has a special meaning for output associations.
Output pins with this number and device type Output pins with this number and device type
.Dq Ar Headphones .Dq Ar Headphones
@ -639,6 +646,3 @@ to control external amplifiers. In some cases setting proper combination of
GPIO bits may be needed to make sound work on specific device. GPIO bits may be needed to make sound work on specific device.
.Pp .Pp
HDMI and DisplayPort audio may also require support from video driver. HDMI and DisplayPort audio may also require support from video driver.
.Pp
Due to OSS limitation multichannel (not multidevice) playback is not
supported.