svn commit: r202160 - head/share/man/man4

[Alexander Motin]

Author: mav
Date: Tue Jan 12 17:50:26 2010
New Revision: 202160
URL: http://svn.freebsd.org/changeset/base/202160

Log:
  Update, reflecting added multichannel playback support.

Modified:
  head/share/man/man4/snd_hda.4

Modified: head/share/man/man4/snd_hda.4
==============================================================================
--- head/share/man/man4/snd_hda.4	Tue Jan 12 17:38:23 2010	(r202159)
+++ head/share/man/man4/snd_hda.4	Tue Jan 12 17:50:26 2010	(r202160)
@@ -25,7 +25,7 @@
 .\"
 .\" $FreeBSD$
 .\"
-.Dd November 13, 2009
+.Dd January 12, 2010
 .Dt SND_HDA 4
 .Os
 .Sh NAME
@@ -125,12 +125,14 @@ such as
 .Dq Li nofixedrate ,
 will do the opposite and takes precedence.
 Options can be separated by whitespace and commas.
+.Pp
 .Dq Li GPIO Ns s
 are a codec's General Purpose I/O pins which system integrators sometimes
 use to control external muters, amplifiers and so on.
 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
 system.
+.Pp
 The
 .Dq Li ivref Ns Ar X
 and
@@ -178,6 +180,11 @@ A unique, per-association number used to
 particular association.
 Sequence numbers can be specified as numeric values from 0 to 15.
 .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.
 Output pins with this number and device type
 .Dq Ar Headphones
@@ -639,6 +646,3 @@ to control external amplifiers. In some 
 GPIO bits may be needed to make sound work on specific device.
 .Pp
 HDMI and DisplayPort audio may also require support from video driver.
-.Pp
-Due to OSS limitation multichannel (not multidevice) playback is not
-supported.