From 813f69b32fe0af4b671f177bc66890e41ed67646 Mon Sep 17 00:00:00 2001
From: fruchti <fruchti@gvfr.de>
Date: Sat, 30 Dec 2017 17:44:19 +0100
Subject: [PATCH] Initial

---
 transcode.sh | 116 +++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 116 insertions(+)
 create mode 100644 transcode.sh

diff --git a/transcode.sh b/transcode.sh
new file mode 100644
index 0000000..d571a48
--- /dev/null
+++ b/transcode.sh
@@ -0,0 +1,116 @@
+#!/bin/sh
+
+output_owner=fruchti:data
+updateflagfile=/flags/mp3-transcode
+lockfile=/flags/mp3-transcode-lock
+
+if [ ! -f "$updateflagfile" ] && [ ! "$1" = "-f" ] ; then
+    echo "No update needed. Exiting."
+    exit
+fi
+
+if [ -f "$lockfile" ] ; then
+    echo "Another instance is already running. Exiting."
+    echo "If you are certain this is the only instance, you can delete the lock file $lockfile"
+    exit
+else
+    touch "$lockfile"
+fi
+
+tmpdir=/data/tmp
+
+if [ ! -d "$tmpdir" ] ; then
+    mkdir -p "$tmpdir"
+fi
+
+SAVEIFS=$IFS
+IFS=`echo -ne "\n\b"`
+for flac in `find /data/music -name '*.flac' | sort`; do
+    # MP3
+
+    mp3=`echo "$flac" | sed -e 's/^\/data\/music/\/data\/mp3/' -e 's/.flac$/.mp3/'`
+    tmpmp3="$tmpdir/`basename "$mp3"`"
+    mp3dir=`dirname "$mp3"`
+    transcodemp3=false
+
+    if [ ! -d "$mp3dir" ] ; then
+        echo "New Directory: \"$mp3dir\""
+        mkdir -p "$mp3dir"
+    fi
+
+    if [ ! -f "$mp3" ] ; then
+        echo "New MP3: \"$mp3\""
+        transcodemp3=true
+    elif [ "$flac" -nt "$mp3" ] ; then
+        echo "FLAC is newer: \"$mp3\""
+        transcodemp3=true
+    fi
+
+    if [ "$transcodemp3" = true ] ; then
+        echo "Transcoding MP3..."
+        # ffmpeg -i "$flac" -y -b:a 320k -qscale:a 2 -f mp3 "$mp3"
+        ffmpeg -hide_banner -loglevel fatal -i "$flac" -y -b:a 320k -qscale:a 2 -id3v2_version 3 -f mp3 "$tmpmp3" && \
+            mv -f "$tmpmp3" "$mp3" && \
+            chown $output_owner "$mp3"
+        echo -e "Done.\n"
+    fi
+
+    # OGG
+
+    ogg=`echo "$flac" | sed -e 's/^\/data\/music/\/data\/ogg/' -e 's/.flac$/.ogg/'`
+    tmpogg="$tmpdir/`basename "$ogg"`"
+    tmpcover="$tmpdir/cover"
+    tmpmetafile="$tmpdir/metadata"
+    tmpmdimg="$tmpdir/image-with-header"
+    oggdir=`dirname "$ogg"`
+    transcodeogg=false
+
+    if [ ! -d "$oggdir" ] ; then
+        echo "New Directory: \"$oggdir\""
+        mkdir -p "$oggdir"
+    fi
+
+    if [ ! -f "$ogg" ] ; then
+        echo "New OGG: \"$ogg\""
+        transcodeogg=true
+    elif [ "$flac" -nt "$ogg" ] ; then
+        echo "FLAC is newer: \"$ogg\""
+        transcodeogg=true
+    fi
+
+    if [ "$transcodeogg" = true ] ; then
+        echo "Transcoding OGG..."
+
+        ffmpeg -hide_banner -loglevel fatal -i "$flac" -y -map a -qscale:a 6 -id3v2_version 3 -f ogg "$tmpogg" && \
+            mv -f "$tmpogg" "$ogg" && \
+            metaflac --export-picture-to="$tmpcover" "$flac" && \
+            covermimetype="image/png" && \
+            covermimetype="`file -b --mime-type "$tmpcover"`" && \
+            description="" && \
+            vorbiscomment --list --raw "$ogg" > "$tmpmetafile" && \
+            sed -i -e '/^metadata_block_picture/d' "$tmpmetafile" && \
+            echo -n "" > "$tmpmdimg" && \
+            printf "0: %.8x" 3 | xxd -r -g0 >> "$tmpmdimg" && \
+            printf "0: %.8x" $(echo -n "$covermimetype" | wc -c) | xxd -r -g0 >> "$tmpmdimg" && \
+            echo -n "$covermimetype" >> "$tmpmdimg" && \
+            printf "0: %.8x" $(echo -n "$description" | wc -c) | xxd -r -g0 >> "$tmpmdimg" && \
+            echo -n "$description" >> "$tmpmdimg" && \
+            printf "0: %.8x" 0 | xxd -r -g0  >> "$tmpmdimg" && \
+            printf "0: %.8x" 0 | xxd -r -g0  >> "$tmpmdimg" && \
+            printf "0: %.8x" 0 | xxd -r -g0  >> "$tmpmdimg" && \
+            printf "0: %.8x" 0 | xxd -r -g0  >> "$tmpmdimg" && \
+            printf "0: %.8x" $(wc -c "$tmpcover" | cut --delimiter=' ' --fields=1) | xxd -r -g0 >> "$tmpmdimg" && \
+            cat "$tmpcover" >> "$tmpmdimg" && \
+            echo "metadata_block_picture=$(base64 --wrap=0 < "$tmpmdimg")" >> "$tmpmetafile" && \
+            vorbiscomment --write --raw --commentfile "$tmpmetafile" "$ogg" && \
+            chown $output_owner "$ogg"
+
+        echo -e "Done.\n"
+    fi
+done
+
+echo "Done Transcoding."
+IFS=$SAVEIFS
+
+rm -f "$updateflagfile"
+rm -f "$lockfile"