Provided by: squeezelite-pa_1.8-4.1build1_amd64 bug


       squeezelite - Lightweight headless Squeezebox emulator


       squeezelite [options]


       Squeezelite  is  a  small headless Logitech Squeezebox emulator. It is aimed at supporting
       high quality audio including USB DAC based output at multiple sample rates.

       The player is controlled using, and media  is  streamed  from,  a  Logitech  Media  Server
       instance running somewhere on the local network.


       This program supports the following options:

       -?     Show a summary of the available command-line options.

       -s <server>[:<port>]
              Connect  to the specified Logitech Media Server, otherwise uses automatic discovery
              to find server on the local network. This option should only be needed if automatic
              discovery  does  not  work, or the server is not on the local network segment (e.g.
              behind a router).

       -o <output device>
              Specify the audio output device; the default value is default.  Use the  -l  option
              to  list available output devices.  - can be used to output raw samples to standard

       -l     List available audio output devices to stdout and exit. These device names  can  be
              passed  to the -o option in order to select a particular device or configuration to
              use for audio playback.

       -a <params>
              Specify parameters used when opening an audio output device.  For ALSA, the  format
              <b>:<p>:<f>:<m>  is  used where <b> is the buffer time in milliseconds (values less
              than 500) or size in bytes (default 40ms); <p> is the  period  count  (values  less
              than  50)  or size in bytes (default 4 periods); <f> is the sample format (possible
              values: 16, 24, 24_3 or 32); <m> is whether to use mmap (possible values: 0 or  1).
              For  PortAudio,  the  value  is simply the target latency in milliseconds. When the
              output is sent to standard output, the value can be 16, 24 or 32, which denotes the
              sample size in bits.

       -b <stream>:<output>
              Specify internal stream and output buffer sizes in kilobytes.

       -c <codec1>,...
              Restrict  codecs  to  those  specified,  otherwise  load  all available codecs. Use
              squeezelite -h to obtain the list of codecs built into squeezelite.

       -C <timeout>
              Close the output device after <timeout> seconds  of  the  player  being  idle;  the
              default is to always keep the device open as long as the payer is "on".

       -d <category>=<level>
              Set  logging  level.  Categories are: all, slimproto, stream, decode, output or ir.
              Levels can be: info, debug or sdebug.  The option can be repeated to set  different
              log levels for different categories.

       -e <codec1>,...
              Explicitly exclude native support of one or more codecs. See also -c, above.

       -f <logfile>
              Send logging output to a log file instead of standard output or standard error.

       -i [<filename>]
              Enable  LIRC  remote  control  support. If the optional <filename> is not provided,
              ~/.lircrc is used instead.

       -m <mac addr>
              Override the player's MAC address. The format must be colon-delimited  hexadecimal,
              for  example: ab:cd:ef:12:34:56. This is usually automatically detected, and should
              not need to be provided in most circumstances.

       -M <modelname>
              Override the player's hardware model name. The default value is SqueezeLite.

       -n <name>
              Set the player name. This name is used by the Logitech Media Server to refer to the
              player by name. This option is mututally exclusive with -N.

       -N <filename>
              Allow  the  server  to set the player's name. The player name is stored in the file
              pointed to by <filename> so that it can persist between restarts.  This  option  is
              mututally exclusive with -n.

       -p <priority>
              Set  real  time  priority of output thread (1-99; default 45).  Not applicable when
              using PortAudio.

       -P <filename>
              Write the process ID (PID) number to the given <filename>.  This may be useful when
              running squeezelite as a daemon.

       -r <rates>[:<delay>]
              Specify sample rates supported by the output device; this is required if the output
              device is switched off when squeezelite is started. The format is either  a  single
              maximum sample rate, a range of sample rates in the format <min>-<max>, or a comma-
              separated list of available rates. Delay is an optional time to wait when switching
              sample rates between tracks, in milliseconds.

       -u|-R [params]
              Enable upsampling of played audio. The argument is optional; see RESAMPLING (below)
              for more information. The options -u and -R are synonymous.

       -D [delay]
              Output device supports DSD over PCM (DoP). DSD streams will  be  converted  to  DoP
              before output. If this option is not supplied, DSD streams will be converted to PCM
              and resampled, so they can be played on a PCM DAC. Delay is  an  optional  time  to
              wait when switching between PCM and DoP between tracks, in milliseconds.

       -v     Enable  visualiser support. This creates a shared memory segment that contains some
              of the audio being played, so that an external visualiser can read and process this
              to create visualisations.

       -L     List  available  volume  controls for the output device. Only applicable when using
              ALSA output.

       -U <control>
              Unmute the given ALSA <control> at daemon startup and set it to  full  volume.  Use
              software volume adjustment for playback. This option is mutually exclusive with the
              -V option. Only applicable when using ALSA output.

       -V <control>
              Use the given ALSA <control> for volume adjustment during playback.  This  prevents
              the  use  of  software  volume  control within squeezelite. This option is mutually
              exclusive with the -V option. If neither -U nor -V options are  provided,  no  ALSA
              controls are adjusted while running squeezelite and software volume control is used
              instead. Only applicable when using ALSA output.

       -z     Cause squeezelite to run as a daemon. That is, it detaches itself from the terminal
              and runs in the background.

       -t     Display version and license information.


       Audio  can  be  resampled or upsampled before being sent to the output device. This can be
       enabled simply by passing the -u option to squeezelite, but further configuration  can  be
       given as an argument to the option.

       Resampling  is  performed  using  the  SoX  Resampler  library; the documentation for that
       library and  the  SoX  rate  effect  many  be  helpful  when  configuring  upsampling  for

       The              format             of             the             argument             is

       This  part  of  the  argument  string  is  made  up of a number of single-character flags:
       [v|h|m|l|q][L|I|M][s][E|X]. The default value is hL.

       v, h, m, l or q
              are mutually exclusive and correspond to very high,  high,  medium,  low  or  quick

       L, I or M
              correspond to linear, intermediate or minimum phase.

       s      changes resampling bandwidth from the default 95% (based on the 3dB point) to 99%.

       E      exception  -  avoids  resampling  if the output device supports the playback sample
              rate natively.

       X      resamples to  the  maximum  sample  rate  for  the  output  device  ("asynchronous"

              -u vLs would use very high quality setting, linear phase filter and steep cut-off.
              -u hM would specify high quality, with the minimum phase filter.
              -u  hMX  would  specify  high  quality,  with  the  minimum  phase filter and async
              upsampling to max device rate.

       The second optional argument to -u allows the user  to  specify  the  following  arguments
       (taken from the soxr.h header file), in hex:

       #define SOXR_ROLLOFF_SMALL     0u  /* <= 0.01 dB */
       #define SOXR_ROLLOFF_MEDIUM    1u  /* <= 0.35 dB */
       #define SOXR_ROLLOFF_NONE      2u  /* For Chebyshev bandwidth. */

       #define SOXR_MAINTAIN_3DB_PT   4u  /* Reserved for internal use. */
       #define SOXR_HI_PREC_CLOCK     8u  /* Increase 'irrational' ratio accuracy. */
       #define SOXR_DOUBLE_PRECISION 16u  /* Use D.P. calcs even if precision <= 20. */
       #define SOXR_VR               32u  /* Experimental, variable-rate resampling. */

              -u :2 would specify SOXR_ROLLOFF_NONE.

              NB:  In  the  example  above the first option, <quality>, has not been specified so
              would default to hL. Therefore, specifying -u :2 is equivalent to having  specified
              -u hL:2.

       Internally,  data is passed to the SoX resample process as 32 bit integers and output from
       the SoX resample process as  32  bit  integers.  Why  does  this  matter?   There  is  the
       possibility  that  integer samples, once resampled may be clipped (i.e. exceed the maximum
       value). By default, if you do not specify an attenuation value, it will default to -1db. A
       value  of  0  on  the  command line, i.e. -u ::0 will disable the default -1db attenuation
       being applied.

       NB: Clipped samples will be logged. Keep an eye on the log file.

              -u ::6 specifies to apply -6db (ie. halve  the  volume)  prior  to  the  resampling

       The internal 'bit' precision used in the re-sampling calculations (ie. quality).

       NB: HQ = 20, VHQ = 28.

              -u :::28 specifies 28-bit precision.

       A  percentage  value between 0 and 100, where 100 is the Nyquist frequency. The default if
       not explicitly set is 91.3.

              -u ::::98 specifies passband ends at 98 percent of the Nyquist frequency.

       A percentage value between 0 and 100, where 100 is the Nyquist frequency. The  default  if
       not explicitly set is 100.

              -u :::::100 specifies that the stopband starts at the Nyquist frequency.

       A value between 0-100, where 0 is equivalent to the recipe M flag for minimum phase, 25 is
       equivalent to the recipe I flag for intermediate phase and 50 is equivalent to the  recipe
       L flag for linear phase.

              -u ::::::50 specifies linear phase.

       sox(1) - for further information about resampling