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Read wav header and calculate duration

/ Published in: PHP
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Use unpack() to decode header information. Return duration in format mm:ss

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  1. function wavDur($file) {
  2.   $fp = fopen($file, 'r');
  3.   if (fread($fp,4) == "RIFF") {
  4.     fseek($fp, 20);
  5.     $rawheader = fread($fp, 16);
  6.     $header = unpack('vtype/vchannels/Vsamplerate/Vbytespersec/valignment/vbits',$rawheader);
  7.     $pos = ftell($fp);
  8.     while (fread($fp,4) != "data" && !feof($fp)) {
  9.       $pos++;
  10.       fseek($fp,$pos);
  11.     }
  12.     $rawheader = fread($fp, 4);
  13.     $data = unpack('Vdatasize',$rawheader);
  14.     $sec = $data[datasize]/$header[bytespersec];
  15.     $minutes = intval(($sec / 60) % 60);
  16.     $seconds = intval($sec % 60);
  17.     return str_pad($minutes,2,"0", STR_PAD_LEFT).":".str_pad($seconds,2,"0", STR_PAD_LEFT);
  18.   }
  19. }

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