squeezelite - Man Page

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 Lyrion Music 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 Lyrion Music 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 output.

-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>:<d> 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). <d> open ALSA output device twice. (possible values: 0 or 1).
For Linux PortAudio, the value <l> is simply the target latency in milliseconds.
For MacOS, <l>:<r> <l> is target latency in milliseconds. <r> open device in Pro Mode or Play Nice (respective values: 0 or 1).
For Windows, <l>:<e> <l> is target latency in milliseconds. <e> use exclusive mode for WASAPI (possible values: 0 or 1).
When the output is sent to standard output, the value can be 16, 24 or 32, which denotes the sample size in bits. Little Endian only.

-b <stream>:<output>

Specify internal stream and output buffer sizes in kilobytes. Default is 2048:3445.

-c <codec1>,...

Restrict codecs to those specified, otherwise load all available codecs. Use squeezelite -? 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.

-G <GPIO Chip>:<GPIO#>:<H/L>

Specify the kernel gpio chip number. Specify the GPIO Line# to use for Amp Power Relay and if the output should be Active High or Low. This cannot be used with the -S option.

-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 Lyrion Music 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.

-O <mixer device>

Specify mixer device, defaults to <output device>.

-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.

-S <power script>

Absolute path to script to launch on power commands from LMS. This cannot be used with the -G option.

-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.

-W

Read wave and aiff format from header, ignoring server parameters.

-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 -U 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.

-X

Use linear volume adjustments instead of in terms of dB (only for hardware volume control).

-z

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

-Z <rate>

Report rate to server in helo as the maximum sample rate we can support.

-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 squeezelite.

The format of the argument is <recipe>:<flags>:<attenuation>:<precision>:<passband_end>:<stopband_start>:<phase_response>

#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. */

http://wiki.slimdevices.com/index.php/Squeezelite

https://lyrion.org/

sox(1)

for further information about resampling.

squeezelite.service(7).