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Adjust the description of hw.snd.feeder_rate_polyphase_max and

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hw.snd.compat_linux_mmap a bit.

Submitted by:	ariff
Approved by:	re (blanket)
This commit is contained in:
joel 2009-07-09 16:59:29 +00:00
parent eabdd627e2
commit a0e34d5479
1 changed files with 18 additions and 4 deletions
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22
share/man/man4/pcm.4
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@ -25,7 +25,7 @@
.\"
.\" $FreeBSD$
.\"
.Dd July 7, 2009
.Dd July 9, 2009
.Dt SOUND 4
.Os
.Sh NAME
@ -210,10 +210,22 @@ are global settings and
are device specific.
.Bl -tag -width indent
.It Va hw.snd.compat_linux_mmap
Enable to allow PROT_EXEC page mappings.
All Linux applications using sound and
Linux
.Xr mmap 2
require this.
compability.
The following values are supported (default is 0):
.Bl -tag -width 2n
.It -1
Force disabling/denying PROT_EXEC
.Xr mmap 2
requests.
.It 0
Auto detect proc/ABI type, allow
.Xr mmap 2
for Linux applications, and deny for everything else.
.It 1
Always allow PROT_EXEC page mappings.
.El
.It Va hw.snd.default_auto
Enable to automatically assign default sound unit to the most recent
attached device.
@ -240,6 +252,8 @@ Minimum allowable sample rate.
.It Va hw.snd.feeder_rate_polyphase_max
Adjust to set the maximum number of allowed polyphase entries during the
process of building resampling filters.
Disabling polyphase resampling has the benefit of reducing memory usage, at
the expense of slower and lower quality conversion.
Only applicable when the SINC interpolator is used.
Default value is 183040.
Set to 0 to disable polyphase resampling.