[multimedia] Add mp3car.sh

Utility to convert audio files to low-quality MP3s.

bin/mp3car

@@ -0,0 +1 @@
+../multimedia/mp3car.sh

multimedia/README

@@ -101,3 +101,19 @@ Invocation du script :
 
 On spécifie ensuite un ou plusieurs fichier sur lequel ou lesquels
 effectuer l'action.
+
+
+# mp3car.sh #
+
+mp3car.sh uses the pacpl (Perl Audio Converter) multi-purpose audio
+converter to convert audio files in any format to low-quality MP3s
+suitable for listening in a car. The goal is to maximise the number of
+albums that can be contained in a CD-ROM (or USB stick). The default
+encoding parameters are variable bitrate (VBR) from 32 to 128 kbps, in
+joint stereo.
+
+Usage: just call the script with one or more files or directories, and
+they will be converted recursively and put in the target directory
+(~/tmp/mp3car/ by default, edit the script to change that).
+
+You must have installed pacpl and lame for this script to work.

multimedia/mp3car.sh

@@ -0,0 +1,36 @@
+#!/bin/sh
+#
+# mp3car.sh, Copyright © 2014 Matteo Cypriani
+#
+# This program is free software. It comes without any warranty, to
+# the extent permitted by applicable law. You can redistribute it
+# and/or modify it under the terms of the Do What The Fuck You Want
+# To Public License, Version 2, as published by Sam Hocevar. See
+# http://sam.zoy.org/wtfpl/COPYING for more details.
+#
+# This script uses pacpl (Perl Audio Converter) to convert any audio
+# files to low-quality MP3, suitable for listening in a car (default
+# parameters are VBR 32-128 kbps, joint stereo).
+#
+# Dependencies: pacpl, lame
+
+if [ $# -lt 1 ] ; then
+  echo "Usage: $0 <input> [input [...]]"
+  exit 1
+fi
+
+BASEOUTDIR="$HOME/tmp/mp3car"
+LAMEOPTIONS="-v -b 32 -B 128"
+
+for INPUT in "$@" ; do
+  echo
+  echo "*** CONVERTING \"$INPUT\" ***"
+  OUTDIR="$BASEOUTDIR/$(basename "$INPUT")"
+  echo "Destination directory: \"$OUTDIR\""
+  echo
+  mkdir -p "$OUTDIR"
+  pacpl \
+    --to mp3 --encoder lame --defopts 0 --eopts "$LAMEOPTIONS" \
+    --recursive --preserve --outdir "$OUTDIR" \
+    "$INPUT"
+done