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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 xosd.
# 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. 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, or leave it off for percentage.
ADJ=3dB
# osd_cat seems a bit picky about what fonts it'll use. If you give a
# nonexistent font, it won't run at all. If you give a font it "doesn't
# like", you'll see the percentage bar, but no "Volume" text.
FONT=12x24
# What color is the OSD bar and text? See /usr/share/X11/rgb.txt.
# COLOR is for when we're unmuted, MUTECOLOR is for muted.
COLOR=orange
MUTECOLOR=red
# Text drop shadow, 0 to disable.
SHADOW=3
# Where does the OSD show up on screen? One of: top middle bottom
POSITION=bottom
# How long does the OSD persist? In seconds, integer only.
DELAY=2
# 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/.$SELF.osd.pid"
# osd() will kill any previously-spawned osd_cat process. Ideally this
# means rapid multiple keypresses won't "step on" each other. In practice
# it seems to work OK, but if you press the key really fast on a slow
# system, or hold it down with your key-repeat rate cranked up (on any
# system), the OSD bar will never get a chance to display.
osd() {
local got="$( 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 text="Volume $db ($volpct%)"
local color="$COLOR"
local oldpid
if [ -n "$muted" ]; then
text="$text [Muted]"
color="$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 $PIDFILE )"
grep -q '^osd_cat' /proc/$oldpid/cmdline 2>/dev/null && \
kill "$oldpid" 2>/dev/null
fi
osd_cat -b percentage \
-d $DELAY \
-P $volpct \
-p $POSITION \
-c $color \
-s $SHADOW \
-f $FONT \
-T "$text" &
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|<nnn>]
<nnn> is a numeric volume, possibly followed by "dB" and/or "+" or "-".
It will be passed to 'amixer $AMIXER_OPTS set $CHANNEL' as-is.
EOF
exit 1
}
check_deps() {
local missing="no"
for dep in osd_cat amixer; do
if ! type -p "$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 "$1" ;;
*) usage ;;
esac
osd
exit 0
# For reference:
#$ amixer get Master
#Simple mixer control 'Master',0
# Capabilities: pvolume pvolume-joined pswitch pswitch-joined
# Playback channels: Mono
# Limits: Playback 0 - 87
# Mono: Playback 31 [36%] [-42.00dB] [on]
|
