Music On Hold Module

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This module allows playing arbitrary raw audio streams from an external data source. It is typically used to provide entertainment to people waiting on hold or in a queue.

Multiple named sources can be specified, for each only one external process is created and data is distributed internally to all consumers.

Don't forget to check the licensing conditions of the media files or streams used!


File moh.conf:

; List of pipelines that will be used as sources of music (on hold).
; Each pipeline should write to stdout in 16bit signed linear
;  at default rate 8000/s or as specificed in the "rate" parameter.
; From outside (e.g. routing modules) mohs are addressed
;  as moh/default, moh/noise etc.

; use mpg123 to play a bunch of mp3 files (shuffled)
default=while true; do mpg123 -q -m -r 8000 -s -Z sounds/*.mp3; done

; just (loud) random noise from our favorite source
noise=cat /dev/urandom

; a relatively new madplay (>=0.15) is the best choice - low CPU usage,
;  built-in resampling, plays multiple files (shuffled)
madplay=while true; do madplay -q --no-tty-control -m -R 8000 -o raw:- -z sounds/*.mp3; done

; same madplay but with wideband support
wideband=while true; do madplay -q --no-tty-control -m -R ${rate$8000} -o raw:- -z sounds/*.mp3; done

; analog line input
linein=arecord -c 1 -f S16 -r 8000

Sample for using a VLC wrapper script to play an Internet radio channel

streaming=./ ${rate$8000}

The script would be like:

#! /bin/bash

test -z "$1" && exit 1

cvlc --aout file --aout-rate "${2:-8000}" --audiofile-format s16 --audiofile-channels 1 --audiofile-file - --no-audiofile-wav "$1" 2>/dev/null &
trap "kill $vlcpid" SIGPIPE SIGTERM
wait "$vlcpid" 2>/dev/null


For connecting to MOH with javascript use

// connecting to 'linein' (see config above)

See also

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