ebu-scan

#!/bin/bash
# Script to scan audio files and return true peak and various loudness values
# Copyright © 2021 chmaha


# Usage: ebu-scan <input files>.                          

# Check availability of dependencies
function checkAvail()
{
	which "$1" >/dev/null 2>&1
	ret=$?
	if [ $ret -ne 0 ]
	then
		echo "tool \"$1\" not found." >&2
		exit 1
	fi
}

for tool in ffmpeg ; \
	do checkAvail "$tool"; done

#Check for audio files and enumerate
NUMARG=0
for file in "$@"; do
if [ "${file##*.}" == wav ] || [ "${file##*.}" == aif ] || [ "${file##*.}" == aiff ] || [ "${file##*.}" == flac ] || [ "${file##*.}" == ogg ] || [ "${file##*.}" == opus ] || [ "${file##*.}" == mp3 ] || [ "${file##*.}" == wv ];
then
	((NUMARG=NUMARG+1))
fi
done

TEMPDIR=$(mktemp -d)

if [ $# -eq 0 ]
then
	echo "Usage: ebu-scan [-a] <input files>"
	echo "Options:"
	echo " -a	Treat files as an album"
	exit
elif [ "$1" = "-a" ] && [ $# -eq 1 ]
then
	echo "Please add some audio files"
	exit	 
elif [ $NUMARG -eq 0 ]
then
	echo "No compatible audio files present. ebu-scan accepts wav, aiff, flac, mp3, ogg, opus and wavpack."
	exit
elif [ "$1" = "-a" ]
then
	shift
	echo "Treating audio files as album..."
	sleep 1
	for file in "$@" ; do 
	if [ "${file##*.}" == wav ] || [ "${file##*.}" == aif ] || [ "${file##*.}" == aiff ] || [ "${file##*.}" == flac ] || [ "${file##*.}" == ogg ] || [ "${file##*.}" == opus ] || [ "${file##*.}" == mp3 ] || [ "${file##*.}" == wv ];
	then	
		echo -e "file " "'"$(realpath "$file")"'" >> $TEMPDIR/audiofiles.txt
	fi
	done
	ffmpeg -f concat -safe 0 -i $TEMPDIR/audiofiles.txt -af ebur128=peak=true -ar 4410 -f null - > $TEMPDIR/album.txt 2>&1 &
else
	:
fi

# Find real directory name
path=$(realpath "$1")
dirname="${path%/*}"

# Create header for analysis file
echo "File|True Peak|Integrated|Short-term|Momentary|LRA" > "$TEMPDIR/tempanalysis"
echo "|(dBTP)|(LUFS)|(LUFS)|(LUFS)|(LU)" >> "$TEMPDIR/tempanalysis"
touch "$TEMPDIR/skipped.txt"

# Count number of files
NUM=1
SKIPPED=0

# Delete existing analysis.txt if it exists
if [ -f "$dirname/loudness_analysis.txt" ]
then
	rm "$dirname/loudness_analysis.txt"
fi

for file in "$@"; do
# Separate name of file 
FILENAME=${file##*/}

if [ "${file##*.}" == wav ] || [ "${file##*.}" == aif ] || [ "${file##*.}" == aiff ] || [ "${file##*.}" == flac ] || [ "${file##*.}" == ogg ] || [ "${file##*.}" == opus ] || [ "${file##*.}" == mp3 ] || [ "${file##*.}" == wv ];
then
	# Loudness, peak and gain analysis
	ffmpeg -i "$file" -af ebur128=peak=true -ar 4410 -f null - > "$TEMPDIR/la.txt" 2>&1
	INT=$(awk '/I:   / {print $2}' "$TEMPDIR/la.txt") 
	PEAK=$(awk '/Peak:/ {print $2}' "$TEMPDIR/la.txt") 
	SHORT=$(awk -F 'S:|I:' '{print $2}' "$TEMPDIR/la.txt" | sort -rg | head -n 1) 
	MOM=$(awk -F 'M:|S:' '{print $2}' "$TEMPDIR/la.txt" | sort -rg | head -n 1)
	LRA=$(awk '/LRA:     / {print $2}' "$TEMPDIR/la.txt")
	echo "$FILENAME|$PEAK|$INT|$SHORT|$MOM|$LRA" >> "$TEMPDIR/tempanalysis"
	echo -ne 'Analyzing...'$NUM'/'$NUMARG'\r'  
	((NUM=NUM+1))

elif [ -f "$file" ]
then
	((SKIPPED=SKIPPED+1))
	echo "$file" >> "$TEMPDIR/skipped.txt"
else
:
fi
done

wait

if [ -f "$TEMPDIR/album.txt" ]
then
	AINT=$(awk '/I:   / {print $2}' "$TEMPDIR/album.txt") 
	APEAK=$(awk '/Peak:/ {print $2}' "$TEMPDIR/album.txt") 
	ASHORT=$(awk -F 'S:|I:' '{print $2}' "$TEMPDIR/album.txt" | sort -rg | head -n 1) 
	AMOM=$(awk -F 'M:|S:' '{print $2}' "$TEMPDIR/album.txt" | sort -rg | head -n 1)
	ALRA=$(awk '/LRA:     / {print $2}' "$TEMPDIR/album.txt")
	echo >> "$TEMPDIR/tempanalysis"
	echo "Album|$APEAK|$AINT|$ASHORT|$AMOM|$ALRA" >> "$TEMPDIR/tempanalysis"
fi

	#Format analysis data and print	
	echo
	echo	
	cat $TEMPDIR/tempanalysis | column -L -t -s "|" "$TEMPDIR/tempanalysis" | tee "$dirname/loudness_analysis.txt"
	echo
	echo "Skipped files: $SKIPPED"
	cat "$TEMPDIR/skipped.txt"
	printf "\n" >> "$dirname/loudness_analysis.txt"	
	date >> "$dirname/loudness_analysis.txt"

rm -r "$TEMPDIR"