diff options
Diffstat (limited to 'share')
| -rw-r--r-- | share/man/man4/pcm.4 | 22 |
1 files changed, 18 insertions, 4 deletions
diff --git a/share/man/man4/pcm.4 b/share/man/man4/pcm.4 index 1bfdc8a..a3228b3 100644 --- a/share/man/man4/pcm.4 +++ b/share/man/man4/pcm.4 @@ -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. |
