Jump to content
php.lv forumi
Sign in to follow this  
ziedinjsh

waveform veidotājs

Recommended Posts

Sveiki! Man ir neliela ķibele. Ir kods kurš augšupielādējot izveidot mp3 faila waveform bildi. Funkcija strādā, bildi izveidot un parāda, bet ir lieta tādā, ka viņa nesaglabājās! Cik pa google vandījos tad tas esot jādara šādi imagepng($bilde, $vieta_kur_saglabāt); bet tas nestrādā!

 

Kods:

<?php
  function waveform($id, $file){
  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", 1);
  
  define("DEFAULT_WIDTH", 600);
  define("DEFAULT_HEIGHT", 50);
  define("DEFAULT_FOREGROUND", "#666666");
  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))
    );
  }   
  

  
    /**
     * PROCESS THE FILE
     */
  
    // temporary file name
    $tmpname = substr(md5(time()), 0, 10);
    
    // copy from temp upload directory to current
    copy($file, "{$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];
    
      $handle = fopen($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");
	chmod('../../mp3/',0777);
  
    // 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, '../../mp3/');
    }
    imagedestroy($img);

  }

P.S. Paldies jau iepriekš

Share this post


Link to post
Share on other sites

Paldies, varat slēgt ciet! Atrisināju imagepng($bilde, $vieta_kur_saglabā.$bildes_nosaukums.'.png');

Share this post


Link to post
Share on other sites
Guest
This topic is now closed to further replies.
Sign in to follow this  

×
×
  • Create New...