volume-pulseaudio

#!/usr/bin/env bash
# Displays the default device, volume, and mute status for i3blocks

AUDIO_HIGH_SYMBOL=$'🔊\uFE0E '

AUDIO_MED_THRESH=50
AUDIO_MED_SYMBOL=$'🔉\uFE0E '

AUDIO_LOW_THRESH=0
AUDIO_LOW_SYMBOL=$'🔈\uFE0E '

AUDIO_MUTED_SYMBOL=$'🔇\uFE0E '

AUDIO_INTERVAL=5

LONG_FORMAT=4
SHORT_FORMAT=2
USE_PERCENT=1
USE_ALSA_NAME=0
USE_DESCRIPTION=0

SUBSCRIBE=0

while getopts F:Sf:padH:M:L:X:T:t:C:c:i:m:s:h opt; do
    case "$opt" in
        S) SUBSCRIBE=1 ;;
        F) LONG_FORMAT="$OPTARG" ;;
        f) SHORT_FORMAT="$OPTARG" ;;
        p) USE_PERCENT=0 ;;
        a) USE_ALSA_NAME=1 ;;
        d) USE_DESCRIPTION=1 ;;
        H) AUDIO_HIGH_SYMBOL="$OPTARG" ;;
        M) AUDIO_MED_SYMBOL="$OPTARG" ;;
        L) AUDIO_LOW_SYMBOL="$OPTARG" ;;
        X) AUDIO_MUTED_SYMBOL="$OPTARG" ;;
        T) AUDIO_MED_THRESH="$OPTARG" ;;
        t) AUDIO_LOW_THRESH="$OPTARG" ;;
        i) AUDIO_INTERVAL="$OPTARG" ;;
        m) MIXER="$OPTARG" ;;
        s) SCONTROL="$OPTARG" ;;
        h) printf \
"Usage: volume-pulseaudio [-S] [-F format] [-f format] [-p] [-a|-d] [-H symb] [-M symb]
        [-L symb] [-X symb] [-T thresh] [-t thresh] [-C color] [-c color] [-i inter]
        [-m mixer] [-s scontrol] [-h]
Options:
-F, -f\tOutput format (-F long format, -f short format) to use, amongst:
\t0\t symb vol [index:name]\t (default long)
\t1\t symb vol [name]
\t2\t symb vol [index]\t (default short)
\t3\t symb vol
-S\tSubscribe to volume events (requires persistent block, always uses long format)
-p\tOmit the percent sign (%%) in volume
-a\tUse ALSA name if possible
-d\tUse device description instead of name if possible
-H\tSymbol to use when audio level is high. Default: '$AUDIO_HIGH_SYMBOL'
-M\tSymbol to use when audio level is medium. Default: '$AUDIO_MED_SYMBOL'
-L\tSymbol to use when audio level is low. Default: '$AUDIO_LOW_SYMBOL'
-X\tSymbol to use when audio is muted. Default: '$AUDIO_MUTED_SYMBOL'
-T\tThreshold for medium audio level. Default: $AUDIO_MED_THRESH
-t\tThreshold for low audio level. Default: $AUDIO_LOW_THRESH
-i\tInterval size of volume increase/decrease. Default: $AUDIO_INTERVAL
-m\tUse the given mixer.
-s\tUse the given scontrol.
-h\tShow this help text
" && exit 0;;
    esac
done

if [[ -z "$MIXER" ]] ; then
    MIXER="default"
    if amixer -D pulse info >/dev/null 2>&1 ; then
        MIXER="pulse"
    fi
fi

if [[ -z "$SCONTROL" ]] ; then
    SCONTROL=$(amixer -D "$MIXER" scontrols | sed -n "s/Simple mixer control '\([^']*\)',0/\1/p" | head -n1)
fi

CAPABILITY=$(amixer -D $MIXER get $SCONTROL | sed -n "s/  Capabilities:.*cvolume.*/Capture/p")


function move_sinks_to_new_default {
    DEFAULT_SINK=$1
    pacmd list-sink-inputs | grep index: | grep -o '[0-9]\+' | while read SINK
    do
        pacmd move-sink-input $SINK $DEFAULT_SINK
    done
}

function set_default_playback_device_next {
    inc=${1:-1}
    num_devices=$(pacmd list-sinks | grep -c index:)
    sink_arr=($(pacmd list-sinks | grep index: | grep -o '[0-9]\+'))
    default_sink_index=$(( $(pacmd list-sinks | grep index: | grep -no '*' | grep -o '^[0-9]\+') - 1 ))
    default_sink_index=$(( ($default_sink_index + $num_devices + $inc) % $num_devices ))
    default_sink=${sink_arr[$default_sink_index]}
    pacmd set-default-sink $default_sink
    move_sinks_to_new_default $default_sink
}

case "$BLOCK_BUTTON" in
    1) set_default_playback_device_next ;;
    2) amixer -q -D $MIXER sset $SCONTROL $CAPABILITY toggle ;;
    3) set_default_playback_device_next -1 ;;
    4) amixer -q -D $MIXER sset $SCONTROL $CAPABILITY $AUDIO_INTERVAL%+ ;;
    5) amixer -q -D $MIXER sset $SCONTROL $CAPABILITY $AUDIO_INTERVAL%- ;;
esac

function print_format {
    PERCENT="%"
    [[ $USE_PERCENT == 0 ]] && PERCENT=""

    if [[ $MUTED =~ "no" ]]; then
        BLOCK="<active>$SYMBOL$VOL$PERCENT</active>"
    else
        BLOCK="$SYMBOL$VOL$PERCENT"
    fi

    case "$1" in
        1) echo "$BLOCK [$NAME]" ;;
        2) echo "$BLOCK [$INDEX]";;
        3) echo "$BLOCK" ;;
        *) echo "$BLOCK [$INDEX:$NAME]" ;;
    esac
}

function print_block {
    for name in INDEX NAME VOL MUTED; do
        read $name
    done < <(pacmd list-sinks | grep "index:\|name:\|volume: front\|muted:" | grep -A3 '*')
    INDEX=$(echo "$INDEX" | grep -o '[0-9]\+')
    VOL=$(echo "$VOL" | grep -o "[0-9]*%" | head -1 )
    VOL="${VOL%?}"

    NAME=$(echo "$NAME" | sed \
's/.*<.*\.\(.*\)>.*/\1/; t;'\
's/.*<\(.*\)>.*/\1/; t;'\
's/.*/unknown/')

    if [[ $USE_ALSA_NAME == 1 ]] ; then
        ALSA_NAME=$(pacmd list-sinks |\
awk '/^\s*\*/{f=1}/^\s*index:/{f=0}f' |\
grep "alsa.name\|alsa.mixer_name" |\
head -n1 |\
sed 's/.*= "\(.*\)".*/\1/')
        NAME=${ALSA_NAME:-$NAME}
    elif [[ $USE_DESCRIPTION == 1 ]] ; then
        DESCRIPTION=$(pacmd list-sinks |\
awk '/^\s*\*/{f=1}/^\s*index:/{f=0}f' |\
grep "device.description" |\
head -n1 |\
sed 's/.*= "\(.*\)".*/\1/')
        NAME=${DESCRIPTION:-$NAME}
    fi

    if [[ $MUTED =~ "no" ]] ; then
        SYMBOL=$AUDIO_HIGH_SYMBOL
        [[ $VOL -le $AUDIO_MED_THRESH ]] && SYMBOL=$AUDIO_MED_SYMBOL
        [[ $VOL -le $AUDIO_LOW_THRESH ]] && SYMBOL=$AUDIO_LOW_SYMBOL
    else
        SYMBOL=$AUDIO_MUTED_SYMBOL
    fi

    if [[ $SUBSCRIBE == 1 ]] ; then
        print_format "$LONG_FORMAT"
    else
        print_format "$LONG_FORMAT"
        print_format "$SHORT_FORMAT"
    fi
}

print_block
if [[ $SUBSCRIBE == 1 ]] ; then
    while read -r EVENT; do
        print_block
    done < <(pactl subscribe | stdbuf -oL grep change)
fi