mdw@git.distorted.org.uk Git - autoys/blob - flaccrip/offset-album

   1 #! /bin/bash
   2
   3 set -e
   4 : ${JBDIR=/mnt/jb}
   5
   6 case $# in
   7   3) ;;
   8   *) echo >&2 "Usage: $0 OFFSET SOURCEDIR TARGETDIR"; exit 1 ;;
   9 esac
  10
  11 offset=$1 sourcedir=$2 targetdir=$3
  12 mkdir "$targetdir"
  13 tmp="$targetdir"/_tmp; mkdir "$tmp"
  14 trap 'rm -rf "$targetdir"' EXIT INT TERM
  15
  16 lens=""
  17 for i in "$sourcedir"/*.flac; do
  18   base=${i##*/}
  19   metaflac --export-tags-to="$tmp/${base%.flac}.tags" "$i"
  20   len=$(metaflac --show-total-samples "$i")
  21   lens="${lens:+$lens }$len"
  22 done
  23
  24 {
  25   if ((offset < 0)); then
  26     $JBDIR/bin/cat-prefix $((4 * -offset)) </dev/zero
  27   fi
  28   for i in "$sourcedir"/*.flac; do
  29     flac -d -s -o- --force-raw-format --sign=signed --endian=little "$i"
  30   done
  31   if ((offset > 0)); then
  32     $JBDIR/bin/cat-prefix $((4 * offset)) </dev/zero
  33   fi
  34 } | {
  35   if ((offset > 0)); then
  36     $JBDIR/bin/cat-prefix $((4 * offset)) >/dev/null
  37   fi
  38   set -- $lens
  39   for i in "$sourcedir"/*.flac; do
  40     base=${i##*/}
  41     len=$1; shift
  42     $JBDIR/bin/cat-prefix $((4 * len)) >"$tmp"/"${base%.flac}.pcm"
  43     flac --force-raw-format --sign=signed --endian=little --channels=2 \
  44       --bps=16 --sample-rate=44100 --best -o "$targetdir"/"$base" \
  45       "$tmp"/"${base%.flac}.pcm"
  46     metaflac --remove-all-tags \
  47       --import-tags-from="$tmp"/"${base%.flac}.tags" \
  48       "$targetdir"/"$base"
  49   done
  50   if ((offset < 0)); then
  51     $JBDIR/bin/cat-prefix $((4 * -offset)) >/dev/null
  52   fi
  53 }
  54
  55 for i in "$sourcedir"/* "$sourcedir"/.[!.]*; do
  56   if [ ! -e "$i" ]; then continue; fi
  57   case "$i" in
  58     *.flac) ;;
  59     *) cp -r "$i" "$targetdir"/ ;;
  60   esac
  61 done
  62
  63 rm -rf "$tmp"
  64 trap '' EXIT INT TERM