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|
#!/bin/sh
# vol - Adjust volume, with on-screen display.
# (c) 2020 B. Watson <urchlay@slackware.uk>
# Released under the WTFPL, see http://www.wtfpl.net/txt/copying/
# Requires aosd_cat (on Slackware, libaosd from SBo).
# Intended for use with xbindkeys, like so:
#$ cat ~/.xbindkeysrc
#"vol up &"
# Control+Alt + Prior
#
#"vol down &"
# Control+Alt + Next
#
#"vol mute &"
# Control+Alt + Pause
# "Next" and "Prior" are PageDown and PageUp. Replace with "Up" and "Down"
# to use arrow keys. If you have multimedia keys, you can probably use
# them (try XF86AudioRaiseVolume, XF86AudioLowerVolume, and
# XF86AudioMute). See xbindkeys(1).
# Can also be used from the command line. Run with no args for help.
# --------------------
# Configurable options
# --------------------
# Should be "Master" for most (all?) cards. Use "amixer scontrols" to
# get a list.
CHANNEL=Master
# Each up/down adjustment is by this much. Use the dB suffix if you
# prefer decibels, % percentage, no suffix for raw units (on one of my
# sound cards, the raw unit range is 0 to 87; on another, 0-127).
ADJ=1%
# Pango font string, see:
# https://docs.gtk.org/Pango/type_func.FontDescription.from_string.html
# The size is in points; 30px would be pixels.
FONT="Mono Normal 30"
# What color is the OSD bar and text? See /usr/share/X11/rgb.txt,
# or use hex escapes (with #).
# COLOR is for when we're unmuted, MUTECOLOR is for muted.
COLOR='#00ff00'
MUTECOLOR='#ff0000'
# How long does the OSD persist? In milliseconds.
DELAY=2000
# amixer options. Could use -c, -D here. Don't use -q.
# default is "-M", see amixer(1).
AMIXER_OPTS="-M"
# ------------------------------------------
# End of configurable options, rest is code.
# ------------------------------------------
SELF="$( basename $0 )"
PIDFILE="$HOME/.$SELF.osd.pid"
BLOCKS="██████████████████████████████████████████████████"
BLANKS="──────────────────────────────────────────────────"
PARTIAL="▌"
# progress() prints a UTF-8 progress bar with 50 characters.
# takes a percentage, 0 to 100
progress() {
local text="$1"
local count="$2"
local solidblocks
local partial
local trailing
solidblocks="$(( $count / 2 ))"
partial="$(( $count % 2 ))"
trailing="$(( 50 - ( $solidblocks + $partial) ))"
echo -n "$text${BLOCKS:0:$solidblocks}"
[ "$partial" = "1" ] && echo -n $PARTIAL
echo -n "${BLANKS:0:$trailing}"
}
# osd() will kill any previously-spawned aosd_cat process. Ideally this
# means rapid multiple keypresses won't "step on" each other. In practice
# it seems to work OK, but if you press the key really fast on a slow
# system, or hold it down with your key-repeat rate cranked up (on any
# system), the OSD bar will never get a chance to display.
osd() {
local got="$( amixer $AMIXER_OPTS get $CHANNEL | tail -1 )"
local muted="$( echo "$got" | grep '\[off\]$' )"
local volpct="$( echo "$got" | cut -d'[' -f2 | cut -d% -f1 )"
local db="$( echo "$got" | cut -d'[' -f3 | cut -d']' -f1 )"
local color="$COLOR"
local text="$( printf "%8s" $db) $( printf "%-3s" $volpct% ) "
local oldpid
if [ -n "$muted" ]; then
color="$MUTECOLOR"
fi
# the silliness with grepping in /proc is meant to avoid stale PID
# files whose PIDs have been recycled.
if [ -e $PIDFILE ]; then
oldpid="$( cat $PIDFILE )"
grep -q '^aosd_cat' /proc/$oldpid/cmdline 2>/dev/null && \
kill -9 "$oldpid" 2>/dev/null
rm -f $PIDFILE
fi
# TODO: make these variables in the config section rather than
# hardcoding them.
progress "$text" "$volpct" | \
aosd_cat \
--fore-color $color \
--back-color '#808080' \
--font "$FONT" \
--output 1 \
--x-offset 159 \
--y-offset 0 \
--position 7 \
--transparency 1 \
--back-opacity 128 \
--padding 7 \
--alignment 0 \
--fade-in 0 \
--fade-out 0 \
--fade-full $DELAY &
echo "$!" > $PIDFILE
}
amixer_set() {
amixer -q $AMIXER_OPTS set $CHANNEL $1
}
vol() {
amixer_set ${ADJ}${1}
}
mute() {
amixer_set toggle
}
usage() {
cat <<EOF
$SELF [up|down|mute|<nn>]
<nn> is a numeric volume, possibly followed by "dB" or "%", and/or
"+" or "-". It will be passed to 'amixer $AMIXER_OPTS set $CHANNEL' as-is.
EOF
exit 1
}
check_deps() {
local missing="no"
for dep in aosd_cat amixer; do
if ! type -p "$dep" > /dev/null; then
echo "$SELF: missing required executable '$dep'" 1>&2
missing="yes"
fi
done
if [ "$missing" = "yes" ]; then
echo "$SELF: please install the missing executable(s)" 1>&2
exit 1
fi
}
###main()
check_deps
case "$1" in
up) vol + ;;
down) vol - ;;
mute) mute ;;
[0-9]*) amixer_set "$1" ;;
*) usage ;;
esac
osd
exit 0
|
