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- Remove obsolete and confusing comment about renaming "sound" to "snd".
We will look at renaming stuff for 9.0, but it's far from certain that we will do it this way. - Sort sysctl's alphabetically. I'll add a bunch of new sysctl's once ariff's next mega-patch goes in, and having everything sorted makes my job easier.
This commit is contained in:
Joel Dahl
parent
7ff1b9822d
commit
82474c294c
Notes:
svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=193246
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@ -25,7 +25,7 @@
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.\"
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.\" $FreeBSD$
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.\"
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.Dd June 23, 2007
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.Dd June 1, 2009
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.Dt SOUND 4
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.Os
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.Sh NAME
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@ -51,16 +51,6 @@ hint.pcm.0.drq="1"
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hint.pcm.0.flags="0x0"
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.Ed
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.Sh DESCRIPTION
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.Bf -emphasis
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Note: There exists some ambiguity in the naming at the moment
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.Pq Nm sound , pcm , snd .
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It will be resolved soon by renaming
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.Cd "device sound"
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to
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.Cd "device snd" ,
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and doing associated changes.
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.Ef
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.Pp
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The
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.Nm
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driver provides support for
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@ -170,14 +160,34 @@ tunables are global settings and
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.Va dev.pcm.*
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are device specific.
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.Bl -tag -width ".Va hw.snd.report_soft_formats" -offset indent
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.It Va hw.snd.latency_profile
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Define sets of buffering latency conversion tables for the
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.Va hw.snd.latency
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tunable.
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A value of 0 will use a low and aggressive latency profile which can result
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in possible underruns if the application cannot keep up with a rapid irq
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rate, especially during high workload.
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The default value is 1, which is considered a moderate/safe latency profile.
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.It Va hw.snd.compat_linux_mmap
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Enable to allow PROT_EXEC page mappings.
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All Linux applications using sound and
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.Xr mmap 2
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require this.
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.It Va hw.snd.default_auto
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Enable to automatically assign default sound unit to the most recent
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attached device.
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.It Va hw.snd.default_unit
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Default sound card for systems with multiple sound cards.
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When using
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.Xr devfs 5 ,
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the default device for
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.Pa /dev/dsp .
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Equivalent to a symlink from
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.Pa /dev/dsp
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to
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.Pa /dev/dsp Ns Va ${hw.snd.default_unit} .
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.It Va hw.snd.feeder_rate_max
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Maximum allowable sample rate.
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.It Va hw.snd.feeder_rate_min
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Minimum allowable sample rate.
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.It Va hw.snd.feeder_rate_round
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Sample rate rounding threshold, to avoid large prime division at the
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cost of accuracy.
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All requested sample rates will be rounded to the nearest threshold value.
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Possible values range between 0 (disabled) and 500.
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Default is 25.
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.It Va hw.snd.latency
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Configure the buffering latency.
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Only affects applications that do not explicitly request
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@ -186,26 +196,31 @@ This tunable provides finer granularity than the
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.Va hw.snd.latency_profile
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tunable.
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Possible values range between 0 (lowest latency) and 10 (highest latency).
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.It Va hw.snd.latency_profile
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Define sets of buffering latency conversion tables for the
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.Va hw.snd.latency
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tunable.
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A value of 0 will use a low and aggressive latency profile which can result
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in possible underruns if the application cannot keep up with a rapid irq
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rate, especially during high workload.
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The default value is 1, which is considered a moderate/safe latency profile.
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.It Va hw.snd.maxautovchans
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Global
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.Tn VCHAN
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setting that only affects devices with at least one playback or recording channel available.
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The sound system will dynamically create up this many
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.Tn VCHANs .
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Set to
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.Dq 0
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if no
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.Tn VCHANS
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are desired.
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Maximum value is 256.
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.It Va hw.snd.report_soft_formats
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Controls the internal format conversion if it is
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available transparently to the application software.
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When disabled or not available, the application will
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only be able to select formats the device natively supports.
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.It Va hw.snd.compat_linux_mmap
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Enable to allow PROT_EXEC page mappings.
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All Linux applications using sound and
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.Xr mmap 2
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require this.
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.It Va hw.snd.feeder_rate_round
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Sample rate rounding threshold, to avoid large prime division at the
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cost of accuracy.
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All requested sample rates will be rounded to the nearest threshold value.
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Possible values range between 0 (disabled) and 500.
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Default is 25.
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.It Va hw.snd.feeder_rate_max
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Maximum allowable sample rate.
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.It Va hw.snd.feeder_rate_min
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Minimum allowable sample rate.
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.It Va hw.snd.verbose
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Level of verbosity for the
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.Pa /dev/sndstat
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@ -228,31 +243,6 @@ File names and versions of the currently loaded sound modules.
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.It 4
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Various messages intended for debugging.
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.El
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.It Va hw.snd.maxautovchans
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Global
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.Tn VCHAN
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setting that only affects devices with at least one playback or recording channel available.
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The sound system will dynamically create up this many
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.Tn VCHANs .
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Set to
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.Dq 0
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if no
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.Tn VCHANS
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are desired.
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Maximum value is 256.
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.It Va hw.snd.default_unit
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Default sound card for systems with multiple sound cards.
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When using
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.Xr devfs 5 ,
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the default device for
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.Pa /dev/dsp .
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Equivalent to a symlink from
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.Pa /dev/dsp
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to
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.Pa /dev/dsp Ns Va ${hw.snd.default_unit} .
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.It Va hw.snd.default_auto
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Enable to automatically assign default sound unit to the most recent
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attached device.
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.It Va dev.pcm.%d.[play|rec].vchans
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The current number of
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.Tn VCHANs
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@ -264,18 +254,18 @@ Setting this value to
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will disable
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.Tn VCHANs
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for this device.
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.It Va dev.pcm.%d.[play|rec].vchanrate
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Sample rate speed for
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.Tn VCHAN
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mixing.
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All playback paths will be converted to this sample rate before the mixing
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process begins.
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.It Va dev.pcm.%d.[play|rec].vchanformat
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Format for
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.Tn VCHAN
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mixing.
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All playback paths will be converted to this format before the mixing
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process begins.
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.It Va dev.pcm.%d.[play|rec].vchanrate
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Sample rate speed for
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.Tn VCHAN
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mixing.
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All playback paths will be converted to this sample rate before the mixing
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process begins.
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.It Va dev.pcm.%d.polling
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Experimental polling mode support where the driver operates by querying the
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device state on each tick using a
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