piano.sh: added

src/dot_local/bin/executable_piano.sh

@@ -0,0 +1,70 @@
+#!/bin/sh
+# Script to set up the digital piano synth without a GUI.
+#
+# Requires an instrument sample pack, which can be obtained from:
+# - https://freepats.zenvoid.org/Piano/acoustic-grand-piano.html
+# - https://linuxsampler.org/instruments.html
+# This script also requires manual PipeWire configuration using, for example, qpwgraph,
+# to hook the MIDI input to LinuxSampler, and then LinuxSampler to your audio output.
+# Once configured, save your PipeWire patchbay as "~/.config/piano_patch.qpwgraph".
+#
+# Depends on: linuxsampler, netcat, pipewire-jack, qpwgraph
+#
+# Examples:
+#
+# 	piano.sh ~/samples/maestro_concert_grand.gig
+# 	piano.sh ~/samples/salamander.sfz
+#
+# The file extension is used to recognize the file format, so it is necessary that it is correct.
+
+set -e
+
+die() {
+	echo "$@" > /dev/stderr
+	exit 1
+}
+
+if [ -z "$PIANO_PATCH" ]; then
+	PIANO_PATCH="$HOME"/.config/piano_patch.qpwgraph
+fi
+PIANO_PATCH=$(realpath "$PIANO_PATCH")
+
+INSTRUMENT="$1"
+INSTRUMENT=$(realpath "$INSTRUMENT")
+
+if [ -z "$INSTRUMENT" ]; then
+	die "No instrument sample pack provided. See script source for more information."
+fi
+
+case "$INSTRUMENT" in
+	*.gig) FORMAT="gig" ;;
+	*.sfz) FORMAT="sfz" ;;
+	*.sf2) FORMAT="sf2" ;;
+	*) die "Unknown format for instrument: $INSTRUMENT" ;;
+esac
+
+pw-jack linuxsampler &
+
+cat << EOF | nc localhost 8888
+
+SET ECHO 1
+
+CREATE AUDIO_OUTPUT_DEVICE JACK
+CREATE MIDI_INPUT_DEVICE ALSA
+ADD CHANNEL
+LOAD ENGINE $FORMAT 0
+SET CHANNEL AUDIO_OUTPUT_DEVICE 0 0
+SET CHANNEL MIDI_INPUT_DEVICE 0 0
+LOAD INSTRUMENT '$INSTRUMENT' 0 0
+GET CHANNEL INFO 0
+QUIT
+
+EOF
+
+echo "Quit qpwgraph to gracefully stop piano.sh." > /dev/stderr
+qpwgraph "$PIANO_PATCH"
+echo "piano.sh stopping..." > /dev/stderr
+
+# these processes love to linger around
+killall -q ls-main
+killall -q linuxsampler