simple.awk

#! /bin/awk -f

#  Running examples (simple.awk is name of this script):
#
#  ./simple.awk sample.txt
#  ./simple.awk -v debug=1 sample.txt
#  ./simple.awk -v path='~/Media/' sample.txt
#  ./simple.awk -v debug=1 -v path='~/Media/' sample.txt

BEGIN {
        LDEBUG="";
        LPATH="";
    if(length(path)>0){
        LPATH=path;
    }
    if(length(debug)>0){
        LDEBUG=debug;
    }
        extinf="";
}

/^#EXTINF:[0-9]+,.+$/{
  gsub(/[ \t\n\r]+$/,""); # remove trailing non-printable chars from $0
  match($0,/^#EXTINF:([0-9]+),(.+)[[:space:]]*$/,ar);
  extinf = "\"" ar[1] "." ar[2] ".mp3\"";
  if(LPATH)  extinf = LPATH extinf;
  if(LDEBUG) print extinf;
}

/^http:\/\/.+\.mp3[\ \n\r\t]*$/{
  if(extinf){
    gsub(/[ \t\n\r]+$/,""); # remove trailing non-printable chars from $0
    cmd="wget -O "extinf" '"$0"'";
    if(LDEBUG) print cmd;
    else system(cmd);
    extinf="";
  }
}