apply_replaygain

#!/bin/bash

# Applies replaygain info to all compatible files in the specified directory

if [[ $# -lt 1 ]]; then
    echo "Usage: $0 [directory]"
    exit
fi

cd "$1"

find . -type f | sort | while read f; do
    # Convert filename to lowercase to match extension
    filenameLower="${f,,}"

    case "$filenameLower" in
        *.flac)
            metaflac --list "$f" | grep -q REPLAYGAIN

            # No replaygain data found
            if [[ $? -eq 1 ]]; then
                echo "-> Applying replaygain to FLAC file $f"
                metaflac --add-replay-gain "$f"

                if [[ $? -eq 1 ]]; then
                    echo "Failed, trying to resample FLAC file $f"
                    /home/tails/bin/resample_flac  "$f"
                fi
            fi
            ;;

        *.ogg)
            vorbiscomment -l "$f"| grep -q REPLAYGAIN_TRACK

            # No replaygain data found
            if [[ $? -eq 1 ]]; then
                echo "-> Applying replaygain to OGG file $f"
                vorbisgain "$f"
            fi
            ;;

        *.mp3 | *.m4a )
            aacgain -s c "$f" | grep -q "Recommended"

            # No replaygain data found
            if [[ $? -eq 1 ]]; then
                echo "-> Applying replaygain to MP3/M4A file $f"
                aacgain -k "$f"
            fi
            ;;
   esac
done