wavto16

   1 #!/usr/bin/env bash
   2
   3 #=======================================================================
   4 # wavto16
   5 # File ID: e755fe92-820c-11e2-814c-0016d364066c
   6 #
   7 # Convert media files to 16 bit little endian .wav
   8 #
   9 # Author: Øyvind A. Holm <sunny@sunbase.org>
  10 # License: GNU General Public License version 2 or later.
  11 #=======================================================================
  12
  13 progname=wavto16
  14 VERSION=0.2.0
  15
  16 ARGS="$(getopt -o "\
  17 c:\
  18 h\
  19 q\
  20 v\
  21 " -l "\
  22 channels:,\
  23 help,\
  24 quiet,\
  25 verbose,\
  26 version,\
  27 " -n "$progname" -- "$@")"
  28 test "$?" = "0" || exit 1
  29 eval set -- "$ARGS"
  30
  31 opt_channels=''
  32 opt_help=0
  33 opt_quiet=0
  34 opt_verbose=0
  35 while :; do
  36     case "$1" in
  37         -c|--channels) opt_channels=$2; shift 2 ;;
  38         -h|--help) opt_help=1; shift ;;
  39         -q|--quiet) opt_quiet=$(($opt_quiet + 1)); shift ;;
  40         -v|--verbose) opt_verbose=$(($opt_verbose + 1)); shift ;;
  41         --version) echo $progname $VERSION; exit 0 ;;
  42         --) shift; break ;;
  43         *) echo $progname: Internal error >&2; exit 1 ;;
  44     esac
  45 done
  46 opt_verbose=$(($opt_verbose - $opt_quiet))
  47
  48 if test "$opt_help" = "1"; then
  49     test $opt_verbose -gt 0 && { echo; echo $progname $VERSION; }
  50     cat <<END
  51
  52 Convert media files to 16 bit little endian .wav . Works on all kinds of
  53 media files that Mplayer/Mplayer2 supports.
  54
  55 Usage: $progname [options] file [files [...]]
  56
  57 Options:
  58
  59   -c NUM, --channels NUM
  60     Use NUM channels in the resulting .wav file.
  61   -h, --help
  62     Show this help.
  63   -q, --quiet
  64     Be more quiet. Can be repeated to increase silence.
  65   -v, --verbose
  66     Increase level of verbosity. Can be repeated.
  67   --version
  68     Print version information.
  69
  70 END
  71     exit 0
  72 fi
  73
  74 if test -z "$1"; then
  75     echo $progname: No files specified >&2
  76     exit 1
  77 fi
  78
  79 if test -n "$opt_channels"; then
  80     echo "$opt_channels" | grep -qE '^[1-8]$' || {
  81         echo -n $progname: Argument to -c/--channels must be an integer >&2
  82         echo " between 1 and 8" >&2
  83         exit 1
  84     }
  85     chan_str=",channels=$opt_channels"
  86 else
  87     chan_str=''
  88 fi
  89
  90 for f in "$@"; do
  91     wavfile="$f"
  92     tmpfile="$f.tmp.wav"
  93     cp -p "$wavfile" "$wavfile.bck"
  94     mplayer -novideo -af format=s16le$chan_str \
  95       -ao "pcm:file=$tmpfile" "$wavfile"
  96     mv "$tmpfile" "$wavfile"
  97 done