| 1 | #! /bin/bash |
| 2 | |
| 3 | set -e |
| 4 | : ${JBDIR=/mnt/jb} |
| 5 | |
| 6 | zero_start=0 trim_end=0 offset=0 |
| 7 | while getopts flF:L:o:b:a: opt; do |
| 8 | case "$opt" in |
| 9 | f) zero_start=$((588 * 5 - 1)) ;; |
| 10 | l) trim_end=$((588 * 5)) ;; |
| 11 | F) zero_start=$OPTARG ;; |
| 12 | L) trim_end=$OPTARG ;; |
| 13 | o) offset=$OPTARG ;; |
| 14 | b) before=$OPTARG ;; |
| 15 | a) after=$OPTARG ;; |
| 16 | *) exit 1 ;; |
| 17 | esac |
| 18 | done |
| 19 | |
| 20 | shift $((OPTIND - 1)) |
| 21 | case $# in |
| 22 | 1) ;; |
| 23 | *) echo >&2 "missing file argument" ;; |
| 24 | esac |
| 25 | file=$1 |
| 26 | |
| 27 | len=$(metaflac --show-total-samples "$file") |
| 28 | |
| 29 | if ((offset < 0)); then |
| 30 | start=0 |
| 31 | stop=$((stop + offset)) |
| 32 | elif ((offset >= 0)); then |
| 33 | start=$offset |
| 34 | stop=$len |
| 35 | fi |
| 36 | |
| 37 | { |
| 38 | if ((offset < 0)); then |
| 39 | if [ "${before+set}" ]; then |
| 40 | n=$(metaflac --show-total-samples "$before") |
| 41 | flac -d -s -o- --force-raw-format --sign=signed --endian=little \ |
| 42 | --skip=$((n + offset)) --until=$n \ |
| 43 | "$before" |
| 44 | else |
| 45 | $JBDIR/bin/cat-prefix $((4 * -offset)) </dev/zero |
| 46 | fi |
| 47 | fi |
| 48 | |
| 49 | flac -d -s -o- --force-raw-format --sign=signed --endian=little \ |
| 50 | --skip=$start --until=$stop \ |
| 51 | "$file" |
| 52 | |
| 53 | if ((offset > 0)); then |
| 54 | if [ "${after+set}" ]; then |
| 55 | flac -d -s -o- --force-raw-format --sign=signed --endian=little \ |
| 56 | --skip=0 --until=$offset \ |
| 57 | "$after" |
| 58 | else |
| 59 | $JBDIR/bin/cat-prefix $((4 * offset)) </dev/zero |
| 60 | fi |
| 61 | fi |
| 62 | } | { |
| 63 | if ((zero_start > 0)); then |
| 64 | $JBDIR/bin/cat-prefix $((4 * zero_start)) </dev/zero |
| 65 | $JBDIR/bin/cat-prefix $((4 * zero_start)) >/dev/null |
| 66 | len=$((len - zero_start)) |
| 67 | fi |
| 68 | if ((trim_end > 0)); then |
| 69 | $JBDIR/bin/cat-prefix $((4 * (len - trim_end))) |
| 70 | $JBDIR/bin/cat-prefix $((4 * trim_end)) </dev/zero |
| 71 | cat >/dev/null |
| 72 | else |
| 73 | cat |
| 74 | fi |
| 75 | } |