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pulse-daemon.conf(5) |
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pulse-daemon.conf − PulseAudio daemon configuration file
~/.pulse/daemon.conf
/etc/pulse/daemon.conf
The PulseAudio sound server reads configuration directives from a file ~/.pulse/daemon.conf on startup and when that file doesn’t exist from /etc/pulse/daemon.conf. Please note that the server also reads a configuration script on startup default.pa which also contains runtime configuration directives.
The configuration file is a simple collection of variable declarations. If the configuration file parser encounters either ; or # it ignores the rest of the line until its end.
For the settings that take a boolean argument the values true, yes, on and 1 are equivalent, resp. false, no, off, 0.
daemonize=
Daemonize after startup. Takes a boolean value, defaults to
no. The --daemonize command line option takes
precedence.
fail= Fail to start up if any of the directives in the
configuration
script default.pa fail. Takes a boolean argument,
defaults to yes. The
--fail command line option takes precedence.
allow-module-loading= Allow/disallow module loading
after startup. This
is a security feature that if dsabled makes sure that no
further
modules may be loaded into the PulseAudio server after
startup
completed. It is recommended to disable this when
system-instance is
enabled. Please note that certain features like automatic
hot-plug
support will not work if this option is enabled. Takes a
boolean
argument, defaults to yes. The
--disallow-module-loading command line
option takes precedence.
allow-exit= Allow/disallow exit on user request.
Defaults to yes.
resample-method= The resampling algorithm to use. Use
one of
src-sinc-best-quality, src-sinc-medium-quality,
src-sinc-fastest,
src-zero-order-hold, src-linear, trivial,
speex-float-N, speex-fixed-N,
ffmpeg. See the documentation of libsamplerate and speex
for
explanations of the different src- and speex- methods,
respectively.
The method trivial is the most basic algorithm
implemented. If you’re
tight on CPU consider using this. On the other hand it has
the worst
quality of them all. The Speex resamplers take an integer
quality
setting in the range 0..10 (bad...good). They exist in two
flavours:
fixed and float. The former uses fixed point
numbers, the latter relies
on floating point numbers. On most desktop CPUs the float
point
resampler is a lot faster, and it also offers slightly
better quality.
See the output of dump-resample-methods for a
complete list of all
available resamplers. Defaults to speex-float-3. The
--resample-method
command line option takes precedence. Note that some modules
overwrite
or allow overwriting of the resampler to use.
enable-remixing= If disabled never upmix or downmix
channels to
different channel maps. Instead, do a simple name-based
matching only.
Defaults to yes.
enable-lfe-remixing= if disabeld when upmixing or
downmixing ignore LFE
channels. When this option is dsabled the output LFE channel
will only
get a signal when an input LFE channel is available as well.
If no
input LFE channel is available the output LFE channel will
always be 0.
If no output LFE channel is available the signal on the
input LFE
channel will be ignored. Defaults to no.
use-pid-file= Create a PID file in the runtime directory
($HOME/.pulse/*-runtime/pid). If this is enabled you
may use commands
like --kill or --check. If you are planning to
start more than one
PulseAudio process per user, you better disable this option
since it
effectively disables multiple instances. Takes a boolean
argument,
defaults to yes. The --use-pid-file command
line option takes
precedence.
cpu-limit= If disabled do not install the CPU load
limiter, even on
platforms where it is supported. This option is useful when
debugging/profiling PulseAudio to disable disturbing SIGXCPU
signals.
Takes a boolean argument, defaults to no. The
--no-cpu-limit command
line argument takes precedence.
system-instance= Run the daemon as system-wide instance,
requires root
priviliges. Takes a boolean argument, defaults to no.
The --system
command line argument takes precedence.
local-server-type= Please don’t use this option if
you don’t have to!
This option is currently only useful when you want D-Bus
clients to use
a remote server. This option may be removed in future
versions. If you
only want to run PulseAudio in the system mode, use the
system-instance
option. This option takes one of user, system
or none as the argument.
This is essentially a duplicate for the
system-instance option. The
difference is the none option, which is useful when
you want to use a
remote server with D-Bus clients. If both this and
system-instance are
defined, this option takes precedence. Defaults to whatever
the
system-instance is set.
enable-shm= Enable data transfer via POSIX shared
memory. Takes a
boolean argument, defaults to yes. The
--disable-shm command line
argument takes precedence.
shm-size-bytes= Sets the shared memory segment size for
the daemon, in
bytes. If left unspecified or is set to 0 it will default to
some
system-specific default, usually 64 MiB. Please note that
usually there
is no need to change this value, unless you are running an
OS kernel
that does not do memory overcommit.
lock-memory= Locks the entire PulseAudio process into
memory. While
this might increase drop-out safety when used in conjunction
with
real-time scheduling this takes away a lot of memory from
other
processes and might hence considerably slow down your
system. Defaults
to no.
flat-volumes= Enable ’flat’ volumes, i.e.
where possible let the sink
volume equal the maximum of the volumes of the inputs
connected to it.
Takes a boolean argument, defaults to yes.
high-priority=
Renice the daemon after startup to become a
high-priority process. This a good idea if you experience
drop-outs
during playback. However, this is a certain security issue,
since it
works when called SUID root only, or RLIMIT_NICE is used.
root is
dropped immediately after gaining the nice level on startup,
thus it is
presumably safe. See pulseaudio(1) for more
information. Takes a
boolean argument, defaults to yes. The
--high-priority command line
option takes precedence.
realtime-scheduling= Try to acquire SCHED_FIFO
scheduling for the IO
threads. The same security concerns as mentioned above
apply. However,
if PA enters an endless loop, realtime scheduling causes a
system
lockup. Thus, realtime scheduling should only be enabled on
trusted
machines for now. Please not that only the IO threads of
PulseAudio are
made real-time. The controlling thread is left a normally
scheduled
thread. Thus enabling the high-priority option is
orthogonal. See
pulseaudio(1) for more information. Takes a boolean
argument, defaults
to yes. The --realtime command line option
takes precedence.
realtime-priority= The realtime priority to acquire, if
realtime-scheduling is enabled. Note: JACK uses 10 by
default, 9 for
clients. Thus it is recommended to choose the PulseAudio
real-time
priorities lower. Some PulseAudio threads might choose a
priority a
little lower or higher than the specified value. Defaults to
5.
nice-level= The nice level to acquire for the daemon, if
high-priority
is enabled. Note: on some distributions X11 uses -10 by
default.
Defaults to -11.
exit-idle-time=
Terminate the daemon after the last client quit and
this time in seconds passed. Use a negative value to disable
this
feature. Defaults to 20. The --exit-idle-time command
line option takes
precedence.
scache-idle-time= Unload autoloaded sample cache entries
after being
idle for this time in seconds. Defaults to 20. The
--scache-idle-time
command line option takes precedence.
dl-search-path=
The path were to look for dynamic shared objects
(DSOs/plugins). You may specify more than one path separated
by colons.
The default path depends on compile time settings. The
--dl-search-path
command line option takes precedence.
default-script-file= The default configuration script
file to load.
Specify an empty string for not loading a default script
file. The
default behaviour is to load ~/.pulse/default.pa, and
if that file does
not exist fall back to the system wide installed version
/etc/pulse/default.pa. If run in system-wide mode the
file
/etc/pulse/system.pa is used instead. If -n is
passed on the command
line or default-script-file= is disabled the default
configuration
script is ignored.
load-default-script-file= Load the default configuration
script file as
specified in default-script-file=. Defaults to
yes.
log-target=
The default log target. Use either stderr,
syslog or auto.
The latter is equivalent to sylog in case
daemonize is enabled,
otherwise to stderr. Defaults to auto. The
--log-target command line
option takes precedence.
log-level= Log level, one of debug, info,
notice, warning, error. Log
messages with a lower log level than specified here are not
logged.
Defaults to notice. The --log-level command
line option takes
precedence. The -v command line option might alter
this setting.
log-meta= With each logged message log the code location
the message
was generated from. Defaults to no.
log-time= With each logged messages log the relative
time since
startup. Defaults to no.
log-backtrace= When greater than 0, with each logged
message log a code
stack trace up the specified number of stack frames.
Defaults to 0.
See
getrlimit(2) for more information. Set to -1 if
PulseAudio shall not touch the resource limit. Not all
resource limits are available on all operating systems.
rlimit-as Defaults to -1.
rlimit-rss Defaults to -1.
rlimit-core Defaults to -1.
rlimit-data Defaults to -1.
rlimit-fsize Defaults to -1.
rlimit-nofile Defaults to 256.
rlimit-stack Defaults to -1.
rlimit-nproc Defaults to -1.
rlimit-locks Defaults to -1.
rlimit-sigpending Defaults to -1.
rlimit-msgqueue Defaults to -1.
rlimit-memlock Defaults to 16 KiB. Please note that the
JACK client
libraries may require more locked memory.
rlimit-nice Defaults to 31. Please make sure that the
default nice
level as configured with nice-level fits in this
resource limit, if
high-priority is enabled.
rlimit-rtprio Defaults to 9. Please make sure that the
default
real-time priority level as configured with
realtime-priority= fits in
this resource limit, if realtime-scheduling is
enabled. The JACK client
libraries require a real-time prority of 9 by default.
rlimit-rttime Defaults to 1000000.
Most drivers
try to open the audio device with these settings and then
fall back to lower settings. The default settings are CD
quality: 16bit native endian, 2 channels, 44100 Hz sampling.
default-sample-format= The default sampling format.
Specify one of u8,
s16le, s16be, s24le, s24be,
s24-32le, s24-32be, s32le, s32be
float32le,
float32be, ulaw, alaw. Depending on the
endianness of the CPU the
formats s16ne, s16re, s24ne,
s24re, s24-32ne, s24-32re,
s32ne, s32re,
float32ne, float32re (for native, resp. reverse
endian) are available
as aliases.
default-sample-rate= The default sample frequency.
default-sample-channels The default number of channels.
default-channel-map The default channel map.
alternate-sample-rate The alternate sample frequency.
Sinks and sources
will use either the default-rate-rate value or this
alternate value,
typically 44.1 or 48kHz. Switching between default and
alternate values
is enabled only when the sinks/sources are suspended. This
option is
ignored in passthrough mode where the stream rate will be
used. If set
to zero, this feature is disabled.
Some hardware
drivers require the hardware playback buffer to be
subdivided into several fragments. It is possible to change
these buffer metrics for machines with high scheduling
latencies. Not all possible values that may be configured
here are available in all hardware. The driver will to find
the nearest setting supported. Modern drivers that support
timer-based scheduling ignore these options.
default-fragments= The default number of fragments.
Defaults to 4.
default-fragment-size-msec=The duration of a single
fragment. Defaults
to 25ms (i.e. the total buffer is thus 100ms long).
With the flat
volume feature enabled, the sink HW volume is set to the
same level as the highest volume input stream. Any other
streams (with lower volumes) have the appropriate adjustment
applied in SW to bring them to the correct overall level.
Sadly hadware mixer changes cannot be timed accurately and
thus this change of volumes can somtimes cause the resulting
output sound to be momentarily too loud or too soft. So to
ensure SW and HW volumes are applied concurrently without
any glitches, their application needs to be synchronized.
The sink implementation needs to support deferred volumes.
The following parameters can be used to refine the process.
enable-deferred-volume= Enable deferred volume for the
sinks that
support it. This feature is enabled by default.
deferred-volume-safety-margin-usec= The amount of time
(in usec) by
which the HW volume increases are delayed and HW volume
decreases are
advanced. Defaults to 8000 usec.
deferred-volume-extra-delay-usec= The amount of time (in
usec) by which
HW volume changes are delayed. Negative values are also
allowed.
Defaults to 0.
The PulseAudio Developers <pulseaudio-discuss (at) lists (dot) freedesktop (dot) org>; PulseAudio is available from http://pulseaudio.org/
pulse-client.conf(5), default.pa(5), pulseaudio(1), pacmd(1)
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pulse-daemon.conf(5) | |