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Updated: Wednesday, February 10, 2021

pulse-daemon.conf (5)


pulse-daemon.conf - PulseAudio daemon configuration file







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 con-
       figuration file on startup. If the per-user  file  ~/.config/pulse/dae-
       mon.conf  exists,  it  is used, otherwise the system configuration file
       /etc/pulse/daemon.conf is used. In addition to those main  files,  con-
       figuration  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 pro-
       cessed  in alphabetical order. In case the same option is set in multi-
       ple 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  mod-
       ules  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 prece-

       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 imple-
       mented. 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 (usu-
       ally 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.

       enable-remixing= If disabled never upmix or downmix channels to differ-
       ent  channel  maps.  Instead,  do  a  simple  name-based matching only.
       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 chan-
       nel 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_RUN-
       TIME_DIR/pulse/pid).  If  this  is  enabled  you  may use commands like
       --kill or --check. If you are planning to start more than one  PulseAu-
       dio  process  per  user, you better disable this option since it effec-
       tively 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  debug-
       ging/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 com-
       mand 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 no.

       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  sys-
       tem-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-prior-
       ity  process. This a good idea if you experience drop-outs during play-
       back. However, this is a certain security issue, since  it  works  when
       called  SUID root only, or RLIMIT_NICE is used. root is dropped immedi-
       ately 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  prece-

       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-sched-
       uling 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  fea-
       ture.  Defaults  to  20. The --exit-idle-time command line option takes

       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 oth-
       erwise.  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 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 prece-
       dence. 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 for-
       mats 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 subdi-
       vided 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  imple-
       mentation  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  sup-
       port 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://pulseau-

       See attributes(7) for descriptions of the following attributes:

       |Availability   | library/audio/pulseaudio |
       |Stability      | Pass-through volatile    |
       pulse-client.conf(5), default.pa(5), pulseaudio(1), pacmd(1)

       This     software     was    built    from    source    available    at
       https://github.com/oracle/solaris-userland.   The  original   community
       source  was  downloaded  from  http://freedesktop.org/software/pulseau-

       Further information about this software can be found on the open source
       community website at http://freedesktop.org/software/pulseaudio.

Manuals                              User                 pulse-daemon.conf(5)