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#!/bin/sh
#
# Volume control wrapper to support different systems.
#
# Aaron LI
# Created: 2016-01-07
# Updated: 2016-01-07
#
# ALSA device/driver (Linux)
ALSA_DEV="Master"
# OSS device (FreeBSD/DragonFly)
OSS_DEV="vol"
if [ $# -ne 1 ]; then
echo "Usage:"
echo " `basename $0` < +% | -% | toggle | mute | unmute >"
exit 1
fi
# amixer: Linux ALSA
vol_amixer() {
case "$1" in
toggle)
amixer set ${ALSA_DEV} toggle
;;
mute)
amixer set ${ALSA_DEV} mute
;;
unmute)
amixer set ${ALSA_DEV} unmute
;;
+[1-9]*|-[1-9]*)
sign=`echo "$1" | cut -c1`
value="${1#?}"
amixer set ${ALSA_DEV} "${value}%${sign}" unmute
;;
*)
echo "ERROR: amixer: unknown control command"
exit 11
;;
esac
}
# mixer: FreeBSD/DragonFly OSS
vol_mixer() {
# FIXME: how to toggle/mute/unmute ???
case "$1" in
+[1-9]*|-[1-9]*)
sign=`echo "$1" | cut -c1`
value="${1#?}"
mixer ${OSS_DEV} "${sign}${value}:${sign}${value}"
;;
*)
echo "ERROR: mixer: unknown control command"
exit 21
;;
esac
}
OS=`uname -s`
case "${OS}" in
Linux)
vol_amixer "$1"
;;
FreeBSD|DragonFly)
vol_mixer "$1"
;;
*)
echo "ERROR: currently unsupport operating system"
exit 2
;;
esac
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