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#!/bin/bash
# SPDX-License-Identifier: GPL-3.0-or-later
# Normalize notify sound files to a uniform RMS loudness so every notification
# plays at the same perceived level. Re-encodes each file in place (ogg -> ogg).
# Run once after adding or changing a sound in the notify set.
#
# Each file is measured with ffmpeg's volumedetect, then shifted by a constant
# gain so its mean (RMS) volume lands on TARGET_DB. Peaks sit near 0 dB already,
# so the spread was all in the RMS; leveling the RMS makes them match by ear.
#
# Usage:
# normalize-notify-sounds.sh [SOUND_DIR]
#
# Environment:
# TARGET_DB Target mean (RMS) loudness in dB. Default -31 (gentle + even).
# Lower is quieter. The notify script's NOTIFY_VOLUME knob tunes
# the master level at playback time without re-encoding.
set -euo pipefail
SOUND_DIR="${1:-$HOME/.local/share/sounds/notify}"
TARGET_DB="${TARGET_DB:--31}"
command -v ffmpeg >/dev/null || { echo "ffmpeg not found" >&2; exit 1; }
command -v ffprobe >/dev/null || { echo "ffprobe not found" >&2; exit 1; }
shopt -s nullglob
files=("$SOUND_DIR"/*.ogg)
(( ${#files[@]} )) || { echo "No .ogg files in $SOUND_DIR" >&2; exit 1; }
# Clean up the in-flight temp file on any exit (a failed encode under set -e
# aborts mid-loop, so the trap is what stops the temp from leaking).
tmp=""
cleanup() { [ -n "${tmp:-}" ] && rm -f "$tmp"; return 0; }
trap cleanup EXIT
for f in "${files[@]}"; do
mean=$(ffmpeg -hide_banner -nostats -i "$f" -af volumedetect -f null /dev/null 2>&1 \
| grep -oP 'mean_volume: \K[-0-9.]+' || true)
if [ -z "$mean" ]; then
echo "skip (could not measure): $f" >&2
continue
fi
gain=$(awk -v t="$TARGET_DB" -v m="$mean" 'BEGIN { printf "%.1f", t - m }')
# Resolve the real target (SOUND_DIR is often the stow-symlinked ~/.local
# copy) and stage the temp beside it, so the mv is atomic on the same
# filesystem and replacing the real file leaves the stow symlink pointing
# at it. A truncate-in-place (cat > "$f") would have corrupted the tracked
# file if the encode produced a short or empty output.
target=$(readlink -f "$f")
tmp=$(mktemp --suffix=.ogg --tmpdir="$(dirname "$target")")
ffmpeg -hide_banner -loglevel error -y -i "$f" \
-af "volume=${gain}dB" -c:a libvorbis -q:a 6 "$tmp"
if [ ! -s "$tmp" ]; then
echo "skip (empty re-encode): $f" >&2
rm -f "$tmp"; tmp=""
continue
fi
mv -f "$tmp" "$target"
tmp=""
printf "%-14s mean %7s dB gain %+6s dB -> target %s dB\n" \
"$(basename "$f")" "$mean" "$gain" "$TARGET_DB"
done
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