pulse-daemon.conf(5)          File Formats Manual         pulse-daemon.conf(5)

       pulse-daemon.conf - PulseAudio daemon configuration file





       The PulseAudio sound server reads configuration directives from a
       configuration file on startup. If the per-user file
       ~/.config/pulse/daemon.conf exists, it is used, otherwise the system
       configuration file /etc/pulse/daemon.conf is used. In addition to those
       main files, configuration directives can also be put in files under
       directories ~/.config/pulse/daemon.conf.d/ and
       /etc/pulse/daemon.conf.d/. Those files have to have the .conf file name
       extension, but otherwise the file names can be chosen freely. The files
       under daemon.conf.d are processed in alphabetical order. In case the
       same option is set in multiple files, the last file to set an option
       overrides earlier files. The main daemon.conf file is processed first,
       so options set in files under daemon.conf.d override the main file.

       Please note that the server also reads a configuration script on
       startup. See default.pa(5).

       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 disabled 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,
       soxr-mq, soxr-hq, soxr-vhq. 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. The soxr-family methods are based on libsoxr, a resampler
       library from the SoX sound processing utility. The mq variant has the
       best performance of the three. The hq is more expensive and, according
       to SoX developers, is considered the best choice for audio of up to 16
       bits per sample. The vhq variant has more precision than hq and is more
       suitable for larger samples. The Soxr resamplers generally offer better
       quality at less CPU compared to other resamplers, such as speex. The
       downside is that they can add a significant delay to the output
       (usually up to around 20 ms, in rare cases more). See the output of
       dump-resample-methods for a complete list of all available resamplers.
       Defaults to speex-float-1. The --resample-method command line option
       takes precedence. Note that some modules overwrite or allow overwriting
       of the resampler to use.

       avoid-resampling= If set, try to configure the device to avoid
       resampling. This only works on devices which support reconfiguring
       their rate, and when no other streams are already playing or capturing
       audio. The device will also not be configured to a rate less than the
       default and alternate sample rates.

       enable-remixing= If disabled never upmix or downmix channels to
       different channel maps. Instead, do a simple name-based matching only.
       Defaults to yes.

       remixing-use-all-sink-channels= If enabled, use all sink channels when
       remixing. Otherwise, remix to the minimal set of sink channels needed
       to reproduce all of the source channels. (This has no effect on LFE
       remixing.) Defaults to yes.

       enable-lfe-remixing= If disabled when upmixing or downmixing ignore LFE
       channels. When this option is disabled 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.

       lfe-crossover-freq= The crossover frequency (in Hz) for the LFE filter.
       Set it to 0 to disable the LFE filter. Defaults to 0.

       use-pid-file= Create a PID file in the runtime directory
       ($XDG_RUNTIME_DIR/pulse/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

       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
       privileges. 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 or memfd shared memory.
       Takes a boolean argument, defaults to yes. The --disable-shm command
       line argument takes precedence.

       enable-memfd=. Enable memfd shared memory. Takes a boolean argument,
       defaults to yes.

       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 note 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

              When PulseAudio runs in the per-user mode and detects a login
              session, then any positive value will be reset to 0 so that
              PulseAudio will terminate immediately on logout. A positive
              value therefore has effect only in environments where there's no
              support for login session tracking. A negative value can still
              be used to disable any automatic exit.

              When PulseAudio runs in the system mode, automatic exit is
              always disabled, so this option does nothing.

       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 where 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 ~/.config/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, journal
       (optional), auto, file:PATH or newfile:PATH. On traditional systems
       auto is equivalent to syslog. On systemd-enabled systems, auto is
       equivalent to journal, in case daemonize is enabled, and to stderr
       otherwise. If set to file:PATH, logging is directed to the file
       indicated by PATH. newfile:PATH is otherwise the same as file:PATH, but
       existing files are never overwritten. If the specified file already
       exists, a suffix is added to the file name to avoid overwriting.
       Defaults to auto. The --log-target command line option takes

       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 message 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 priority 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-sample-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 the same value as the default sample rate, 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 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 hardware mixer changes cannot
       be timed accurately and thus this change of volumes can sometimes 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

       pulse-client.conf(5), default.pa(5), pulseaudio(1), pacmd(1)

Manuals                              User                 pulse-daemon.conf(5)