alsavol.sh

gistfile1.txt

#!/bin/bash

# Change alsa volume levels and display notifications using libnotify
#
# author: Tasos Latsas <tlatsas2000 _at_ gmail _dot_ com>

# A more polished version of the original script found in ubuntu forums:
# http://ubuntuforums.org/showpost.php?p=7241817&postcount=2

show_help () {
cat << EOF
usage: $(basename "$0") [OPTIONS] [up | down | toggle]

Increase/decrease/mute using alsa mixer and display notifications


[OPTIONS]
  -h    Show this message
  -c    Comma delimited list of mixer channels (default: Master)
  -s    Step to increase/decrease volume (default: 5)
  -d    Display notifications using libnotify (default: off)
  -q    Quiet, do not print volume level after volume change (default: off)

[up|down|toggle]
Alsa mixer actions
  up     : Increase volume (amixer set 'channel' 'step'+)
  down   : Decrease volume (amixer set 'channel' 'step'-)
  toggle : Mute/Unmute volume (amixer set 'channel' toggle)

EOF
}

get_vol() {
    # return volume levels 0 - 100
    # parameter $1 - alsa channel
    local _vol=$(${_amixer} sget ${1} | grep -o -m 1 '[[:digit:]]*%' | tr -d '%')
    echo ${_vol}
}

get_status() {
    # return the status of the channel
    # parameter $1 - alsa channel
    # return values:
    #   0 - not muted
    #   1 - muted
    status=$(${_amixer} sget ${1} | awk '/[0-9]*%/ { print $NF }' | uniq )
    [[ "${status}" == "[off]" ]] && return 1
    return 0
}

# default values
_display_notification=0
_step=5
_channels=("Master")
_quiet=0
# string/char to display if channel is muted
_chmute='?'

# notification values
_time=1000
_text="Volume Control"


while getopts ":hdqc:s:" options; do
  case ${options} in
    h)
      show_help
      exit 0
      ;;
    d)
      _display_notification=1
      ;;
    c)
      _channels=${OPTARG}
      ;;
    s)
      _step=${OPTARG}
      ;;
    q)
      _quiet=1
      ;;
    \?)
      echo "Invalid option: -${OPTARG}" >&2
      exit 1
      ;;
    :)
      echo "Option -${OPTARG} requires an argument." >&2
      exit 1
      ;;
  esac
done

# check for amixer and notify-send binaries
_amixer=$(which amixer) || exit 1
if [[ $_display_notification -eq 1 ]]; then
    _notify=$(which notify-send) || exit 1
fi

case ${@:$OPTIND} in
    "")
        _command=''
        ;;
    "up")
        _command="${_step}+"
        ;;
    "down")
        _command="${_step}-"
        ;;
    "toggle")
        _command="toggle"
        ;;
    *)
        echo "Unknown command - use up, down, toggle"
        echo "try -h for help"
        exit 1
        ;;
esac


IFS=$','
for channel in $_channels; do
    if [[ ! -z $_command ]]; then
            $_amixer -c 0 set "$channel" $_command > /dev/null
    fi

    if [[ $_quiet -eq 0 ]]; then
        # get channel volume
        _vol=$(get_vol ${channel})

        # if mutted add mute char
        get_status ${channel}
        if [[ $? -eq 1 ]]; then
            _vol="${_vol}${_chmute}"
        else
            _vol="${_vol}%"
        fi
        echo ${_vol}
    fi

    [[ $_display_notification -eq 0 ]] && continue

    # get channel status
    get_status ${channel}
    if [[ $? -eq 1 ]]; then
        _vol="Muted"
        _icon="audio-volume-muted"
    else
        _vol=$(get_vol ${channel})
        if [[ $_vol -eq 0 ]]; then
            _icon="audio-volume-off"
        elif [[ $_vol -lt 33 ]]; then
            _icon="audio-volume-low"
        elif [[ $_vol -lt 66 ]]; then
            _icon="audio-volume-medium"
        else
            _icon="audio-volume-high"
        fi
        _vol="${_vol}%"
    fi

    ${_notify} "${_text}" "${_vol}" -i ${_icon} -t ${_time}

    unset IFS
done
exit 0