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

   1 #! /bin/bash
   2
   3 set -e
   4
   5 ###--------------------------------------------------------------------------
   6 ### Table of contents representation.
   7 ###
   8 ### We need a simple table of contents representation.  A toc file consists
   9 ### of a number of records, one per line; each record is a number of
  10 ### blank-delimited fields.  Fields don't contain whitespace, so no quoting
  11 ### is needed.  The first field of each record is a type which explains how
  12 ### to decode the rest.
  13 ###
  14 ### `T' START   Audio track starts at START frames.
  15 ###
  16 ### `D' START   Data track, starts at START frames.
  17 ###
  18 ### `E' END     Leadout at END frames.
  19
  20 ###--------------------------------------------------------------------------
  21 ### Command line options.
  22
  23 hidden=0
  24 data=none
  25 while getopts "d:h:" opt; do
  26   case "$opt" in
  27     h) hidden=$OPTARG ;;
  28     d) data=$OPTARG ;;
  29     *) exit 1 ;;
  30   esac
  31 done
  32 shift $((OPTIND - 1))
  33
  34 case "$#" in
  35   1) ;;
  36   *) echo >&2 "Usage: $0 [-d DATA] [-h HIDDEN] DIR|CD-DEVICE"; exit 1 ;;
  37 esac
  38 source=$1
  39
  40 ###--------------------------------------------------------------------------
  41 ### Work out what to do.
  42
  43 if [ -d "$source" ]; then
  44
  45   ## Intuit what's going on from a directory full of FLAC files.
  46   cd "$source"
  47   for i in [0-9][0-9][-.\ ]*.flac; do
  48     metaflac --show-total-samples "$i"
  49   done | {
  50     tn=1 tot=$hidden
  51     while read samples; do
  52       frames=$((samples/588))
  53       echo "T $tot"
  54       tot=$((tot + frames))
  55     done
  56     case "$data" in
  57       none)
  58         ;;
  59       *)
  60         tot=$((tot + 11400))
  61         echo "D $tot"
  62         tot=$((tot + data))
  63         ;;
  64     esac
  65     echo "E $tot"
  66   }
  67
  68 elif [ -b "$source" ]; then
  69
  70   ## Read a table of contents from a CD.
  71   wodim dev="$source" -toc | sed '
  72         /^track:/ !d
  73         s/^track:\(.*\) lba: *\([0-9][0-9]*\) (.*mode: *\([-0-9][0-9]*\) *$/\1 \3 \2/
  74   ' | while read track mode offset; do
  75     case "$track,$mode" in
  76       lout,-1) echo "E $offset" ;;
  77       *,0 | *,-1) echo "T $offset" ;;
  78       *,1 | *,2) echo "D $offset" ;;
  79     esac
  80   done
  81
  82 else
  83   echo >&2 "$0: don't know how to read a toc from $source"
  84 fi