Simple drumloopslicer using purely bash, sox and vamp plugin on the console

soxdrumslicer

#!/bin/bash
# Simple drumloopslicer using purely bash, sox and vamp plugin on the console
# @dependancy bc vamp-simple-host

slice(){
  input="$1"
  which bc || { echo "please install 'bc' from your package manager"; exit 1; }
  which vamp-simple-host || { echo "please install 'vamp-examples' from your package manager"; exit 1; }
  hits="$(vamp-simple-host vamp-example-plugins:percussiononsets "$input" 2>/dev/null | grep -E " [0-9].*" | sed 's/ //g;s/://g')";
  declare -a hitArray;
  last=""
  i=0
  IFS='
  ' # set field seperator to newlines
  for hit in $hits; do hitArray[$i]=$hit; ((i++)); done
  for((i=0;i<${#hitArray[@]}-1;i++)); do
    hit=${hitArray[$i]}
    hitnext=${hitArray[$i+1]}
    length="$( echo "$hitnext-$hit" | bc )"; [[ ${length:0:1} == "." ]] && length="0$length"
    echo "processing $input slice #$i"
    sox "$input" "$input.$hit.wav" trim $hit $length fade t 0 0 1500s
  done
}

slice "$1"