deal with sample precisions that are not a power of 2.

discussed with and ok ratchov; manpage tweak from naddy, thanks

1 files changed, 13 insertions, 2 deletions

diff --git a/share/man/man4/audio.4 b/share/man/man4/audio.4
index 5862446b7fa..0a3fbeb4b7a 100644
--- a/share/man/man4/audio.4
+++ b/share/man/man4/audio.4
@@ -1,4 +1,4 @@
-.\"	$OpenBSD: audio.4,v 1.57 2008/10/27 07:53:24 jmc Exp $
+.\"	$OpenBSD: audio.4,v 1.58 2009/01/16 23:07:33 jakemsr Exp $
 .\"	$NetBSD: audio.4,v 1.20 1998/05/28 17:27:15 augustss Exp $
 .\"
 .\" Copyright (c) 1996 The NetBSD Foundation, Inc.
@@ -28,7 +28,7 @@
 .\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 .\" POSSIBILITY OF SUCH DAMAGE.
 .\"
-.Dd $Mdocdate: October 27 2008 $
+.Dd $Mdocdate: January 16 2009 $
 .Dt AUDIO 4
 .Os
 .Sh NAME
@@ -441,6 +441,17 @@ unsigned linear encoding with big endian byte order
 .El
 .Pp
 The
+.Va precision
+parameter describes the number of bits of audio data per sample.
+For ample formats such as 8, 16 and 32-bit, where the number of audio data
+bits is a power of 2,
+.Va precision
+is also exactly the size of each sample.
+For other sample formats the sample size is the smallest power of
+2 bits that the data can fit into.
+For example the sample size of 20 and 24-bit formats is 32 bits.
+.Pp
+The
 .Va gain ,
 .Va port ,
 and