php实现将wav文件转换成图像文件并在页面中显示的方法

本文实例讲述了php实现将wav文件转换成图像文件并在页面中显示的方法。分享给大家供大家参考。具体分析如下:

需求:将wav文件转换成png文件并且显示出来。

Wav_To_Png.php:

  <?php   function wav_graph($file, $f=0, $w=0)   {    global $DATA_DIR;    if(!is_file($file))     return 0;    $fp = fopen($DATA_DIR.$file, 'r');    $raw = fread($fp, 36);    $str = '';    $header = unpack('A4Riff/VSize/A4Wav/A4Head/VHeadSize/vPCM/vChannels/VSampleRate/VByteRate/vBlockAlign/vSampleBits', $raw);    foreach($header as $k=>$v)     $str .= $k.': '. $v.' ';    fseek($fp, 36 + $header['HeadSize'] - 16);    $raw = fread($fp, 8);    $data = unpack('A4Data/VDataSize', $raw);    foreach($data as $k=>$v)     $str .= $k.': '. $v.' ';    $b = $header['SampleBits'];    $c = $header['Channels'];    $l = $b * $c / 8; // sample frame length in bytes    $s = $data['DataSize'] / $l; // total number of samples    $r = $header['SampleRate'];    if($f)     $h = pow(2, $b) / $f;    else     { $h = 200; $f = pow(2, $b - 1) / $h; }    if($w == 0)     $w = round($r / 1000); // default to show 1k sample frames per minute    header("Content-type: image/png");    $im = imagecreate($s / $w, $h * $c * 2);    imagecolorallocate($im, 0xff, 0xff, 0xff); // white bg    $color = imagecolorallocate($im, 0, 0, 255); // black    imagestring($im, 5, 5, 5, $str, $color);    $x=0; $y = array(); $yn = array();    for($i = 0; $i < $c; $i++) $y[$i] = $h * $i + $h;    $n = $l * $w;    while(1)    {     if($s == 0)       break;     if($s < $n)       $n = $s;     $samples = fread($fp, 1000 * $n);     if($samples === FALSE)      break;     $packed = unpack("s*", $samples);     foreach($packed as $k=>$v)     {      $cnt = ($k-1) % ($w * $l) ;      if( $cnt > $c - 1)        continue;      $yn[$cnt] = $h * $cnt + $h - $v / $f;      imageline($im, $x, $y[$cnt], $x+1, $yn[$cnt], $color);      $y[$cnt] = $yn[$cnt];      $x++;     }     $s -= $n;    }    imagepng($im);    imagedestroy($im);   }   wav_graph('GetWave.wav');  ?>

效果图如下:

希望本文所述对大家的php程序设计有所帮助。

php实现将wav文件转换成图像文件并在页面中显示的方法

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