Generieren von mp3-Wellenform mit php

Ich brauchen, um zu bauen, eine web-Skript konvertiert eine mp3-Datei in einem Wellenform-Bild, und ich stieß auf dieser website.

Habe ich hochgeladen, die PHP-Datei und .dll und .exe-Datei aus LAMM auf meiner Webseite (gehostet von host monster).

Aber wenn ich versuche das hochladen der MP3-Datei auf der website, es erzeugt lediglich ein Schwarzes Bild statt der waveform-Bild.

Ich habe wenig Kenntnisse von PHP, so dass ich nicht genau weiß, was falsch ist, aber ich vermute, es hat zu tun mit dem hochladen ein Teil des Programms.

Könnte mir jemand sagen, was falsch ist und wie kann ich darüber hinwegkommen?

Im folgenden wird der php-code ist auch verfügbar in diesem repository auf GitHub).

  <?php

  ini_set("max_execution_time", "30000");

  //how much detail we want. Larger number means less detail
  //(basically, how many bytes/frames to skip processing)
  //the lower the number means longer processing time
  define("DETAIL", 5);

  define("DEFAULT_WIDTH", 500);
  define("DEFAULT_HEIGHT", 100);
  define("DEFAULT_FOREGROUND", "#FF0000");
  define("DEFAULT_BACKGROUND", "#FFFFFF");

  /**
   * GENERAL FUNCTIONS
   */
  function findValues($byte1, $byte2){
    $byte1 = hexdec(bin2hex($byte1));                        
    $byte2 = hexdec(bin2hex($byte2));                        
    return ($byte1 + ($byte2*256));
  }

  /**
   * Great function slightly modified as posted by Minux at
   * http://forums.clantemplates.com/showthread.php?t=133805
   */
  function html2rgb($input) {
    $input=($input[0]=="#")?substr($input, 1,6):substr($input, 0,6);
    return array(
     hexdec(substr($input, 0, 2)),
     hexdec(substr($input, 2, 2)),
     hexdec(substr($input, 4, 2))
    );
  }   

  if (isset($_FILES["mp3"])) {

/**
 * PROCESS THE FILE
 */

//temporary file name
$tmpname = substr(md5(time()), 0, 10);

//copy from temp upload directory to current
copy($_FILES["mp3"]["tmp_name"], "{$tmpname}_o.mp3");

    //support for stereo waveform?
$stereo = isset($_POST["stereo"]) && $_POST["stereo"] == "on" ? true : false;

    //array of wavs that need to be processed
$wavs_to_process = array();

/**
 * convert mp3 to wav using lame decoder
 * First, resample the original mp3 using as mono (-m m), 16 bit (-b 16), and 8 KHz (--resample 8)
 * Secondly, convert that resampled mp3 into a wav
 * We don't necessarily need high quality audio to produce a waveform, doing this process reduces the WAV
 * to it's simplest form and makes processing significantly faster
 */
if ($stereo) {
        //scale right channel down (a scale of 0 does not work)
  exec("lame {$tmpname}_o.mp3 --scale-r 0.1 -m m -S -f -b 16 --resample 8 {$tmpname}.mp3 && lame -S --decode {$tmpname}.mp3 {$tmpname}_l.wav");
        //same as above, left channel
  exec("lame {$tmpname}_o.mp3 --scale-l 0.1 -m m -S -f -b 16 --resample 8 {$tmpname}.mp3 && lame -S --decode {$tmpname}.mp3 {$tmpname}_r.wav");
  $wavs_to_process[] = "{$tmpname}_l.wav";
  $wavs_to_process[] = "{$tmpname}_r.wav";
} else {
  exec("lame {$tmpname}_o.mp3 -m m -S -f -b 16 --resample 8 {$tmpname}.mp3 && lame -S --decode {$tmpname}.mp3 {$tmpname}.wav");
  $wavs_to_process[] = "{$tmpname}.wav";
}

//delete temporary files
unlink("{$tmpname}_o.mp3");
unlink("{$tmpname}.mp3");

//get user vars from form
$width = isset($_POST["width"]) ? (int) $_POST["width"] : DEFAULT_WIDTH;
$height = isset($_POST["height"]) ? (int) $_POST["height"] : DEFAULT_HEIGHT;
$foreground = isset($_POST["foreground"]) ? $_POST["foreground"] : DEFAULT_FOREGROUND;
$background = isset($_POST["background"]) ? $_POST["background"] : DEFAULT_BACKGROUND;
$draw_flat = isset($_POST["flat"]) && $_POST["flat"] == "on" ? true : false;

$img = false;

//generate foreground color
list($r, $g, $b) = html2rgb($foreground);

//process each wav individually
for($wav = 1; $wav <= sizeof($wavs_to_process); $wav++) {

  $filename = $wavs_to_process[$wav - 1];

  /**
   * Below as posted by "zvoneM" on
   * http://forums.devshed.com/php-development-5/reading-16-bit-wav-file-318740.html
   * as findValues() defined above
   * Translated from Croation to English - July 11, 2011
   */
  $handle = fopen($filename, "r");
  //wav file header retrieval
  $heading[] = fread($handle, 4);
  $heading[] = bin2hex(fread($handle, 4));
  $heading[] = fread($handle, 4);
  $heading[] = fread($handle, 4);
  $heading[] = bin2hex(fread($handle, 4));
  $heading[] = bin2hex(fread($handle, 2));
  $heading[] = bin2hex(fread($handle, 2));
  $heading[] = bin2hex(fread($handle, 4));
  $heading[] = bin2hex(fread($handle, 4));
  $heading[] = bin2hex(fread($handle, 2));
  $heading[] = bin2hex(fread($handle, 2));
  $heading[] = fread($handle, 4);
  $heading[] = bin2hex(fread($handle, 4));

  //wav bitrate 
  $peek = hexdec(substr($heading[10], 0, 2));
  $byte = $peek / 8;

  //checking whether a mono or stereo wav
  $channel = hexdec(substr($heading[6], 0, 2));

  $ratio = ($channel == 2 ? 40 : 80);

  //start putting together the initial canvas
  //$data_size = (size_of_file - header_bytes_read) /skipped_bytes + 1
  $data_size = floor((filesize($filename) - 44) / ($ratio + $byte) + 1);
  $data_point = 0;

  //now that we have the data_size for a single channel (they both will be the same)
  //we can initialize our image canvas
  if (!$img) {
    //create original image width based on amount of detail
            //each waveform to be processed with be $height high, but will be condensed
            //and resized later (if specified)
    $img = imagecreatetruecolor($data_size / DETAIL, $height * sizeof($wavs_to_process));

    //fill background of image
    if ($background == "") {
      //transparent background specified
      imagesavealpha($img, true);
      $transparentColor = imagecolorallocatealpha($img, 0, 0, 0, 127);
      imagefill($img, 0, 0, $transparentColor);
    } else {
      list($br, $bg, $bb) = html2rgb($background);
      imagefilledrectangle($img, 0, 0, (int) ($data_size / DETAIL), $height * sizeof($wavs_to_process), imagecolorallocate($img, $br, $bg, $bb));
    }
  }

  while(!feof($handle) && $data_point < $data_size){
    if ($data_point++ % DETAIL == 0) {
      $bytes = array();

      //get number of bytes depending on bitrate
      for ($i = 0; $i < $byte; $i++)
        $bytes[$i] = fgetc($handle);

      switch($byte){
        //get value for 8-bit wav
        case 1:
          $data = findValues($bytes[0], $bytes[1]);
          break;
        //get value for 16-bit wav
        case 2:
          if(ord($bytes[1]) & 128)
            $temp = 0;
          else
            $temp = 128;
          $temp = chr((ord($bytes[1]) & 127) + $temp);
          $data = floor(findValues($bytes[0], $temp) / 256);
          break;
      }

      //skip bytes for memory optimization
      fseek($handle, $ratio, SEEK_CUR);

      //draw this data point
      //relative value based on height of image being generated
      //data values can range between 0 and 255
      $v = (int) ($data / 255 * $height);

      //don't print flat values on the canvas if not necessary
      if (!($v / $height == 0.5 && !$draw_flat))
        //draw the line on the image using the $v value and centering it vertically on the canvas
        imageline(
          $img,
          //x1
          (int) ($data_point / DETAIL),
          //y1: height of the image minus $v as a percentage of the height for the wave amplitude
          $height * $wav - $v,
          //x2
          (int) ($data_point / DETAIL),
          //y2: same as y1, but from the bottom of the image
          $height * $wav - ($height - $v),
          imagecolorallocate($img, $r, $g, $b)
        );         

    } else {
      //skip this one due to lack of detail
      fseek($handle, $ratio + $byte, SEEK_CUR);
    }
  }

  //close and cleanup
  fclose($handle);

  //delete the processed wav file
  unlink($filename);

}

header("Content-Type: image/png");

//want it resized?
if ($width) {
  //resample the image to the proportions defined in the form
  $rimg = imagecreatetruecolor($width, $height);
  //save alpha from original image
  imagesavealpha($rimg, true);
  imagealphablending($rimg, false);
  //copy to resized
  imagecopyresampled($rimg, $img, 0, 0, 0, 0, $width, $height, imagesx($img), imagesy($img));
  imagepng($rimg);
  imagedestroy($rimg);
} else {
  imagepng($img);
}

imagedestroy($img);

  } else {

?>

  <form method="post" action="<?php print $_SERVER["REQUEST_URI"]; ?>"     enctype="multipart/form-data">

  <p>MP3 File:<br />
    <input type="file" name="mp3" /></p>

  <p>Image Width:<br />
    <input type="text" name="width" value="<?php print DEFAULT_WIDTH; ?>" /></p>

  <p>Image Height:<br />
    <input type="text" name="height" value="<?php print DEFAULT_HEIGHT; ?>" /></p>

  <p>Foreground Color: <small>(HEX/HTML color code)</small><br />
    <input type="text" name="foreground" value="<?php print DEFAULT_FOREGROUND; ?>" /></p>

  <p>Background Color: (Leave blank for transparent background) <small>(HEX/HTML color code)</small><br />
    <input type="text" name="background" value="<?php print DEFAULT_BACKGROUND; ?>" /></p>

  <p>Draw flat-line? <input type="checkbox" name="flat" /></p>

  <p>Stereo waveform? <input type="checkbox" name="stereo" /></p>

  <p><input type="submit" value="Generate Waveform" /></p>

  </form>

<?php

  }