JT9-2 Linux script

The executable program by ON7T for the JT slow modes only runs on Windows platforms and crashed when attempting to run it under WINE.  Below is a PHP script that will run on Linux to handle the receive side of things.  External applications needed:

arecord, sox, jt9 (part of wsjtx)

No sound device was specified when invoking arecord, this assumes one is using PulseAudio and selects the appropriate sound device from the PulseAudio volume control application.

<?php 

$f = "decoded.txt"; 
$wav = "jt9-2.wav"; 
$wav_tmp = "jt9-2_tmp.wav"; 
file_put_contents($f, ""); 

while (true){ 

  do { 
    usleep (200); 
  } while ( !((int)date("s") == 0 && ((int)date("i")) % 2 == 0) );

  $timestamp = str_pad(date("Hi"), 4, "0", STR_PAD_LEFT); 
  //$slot = intdiv(date("i") % 4,2); // PHP 7 
  $slot = (int)((date("i") % 4)/2); 
  printf("Time: %sz %d\n",$timestamp,$slot); 
  exec ("arecord -c 1 -r 12000 -f S16_LE -d 105 ".$wav." 2>&1 >/dev/null");
  exec ("sox ".$wav." ".$wav_tmp." speed 2.0 2>&1 >/dev/null");
  exec ("jt9 -9 -d 3 -S 300 ".$wav_tmp." 2>&1 >/dev/null");
  $decodes = file_get_contents($f);
  echo $decodes;
  file_put_contents($f, "");
  unlink($wav);
  unlink($wav_tmp);
}

?>