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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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Release: 2016-06-06 20:05:07
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这篇文章主要介绍了php实现将wav文件转换成图像文件并在页面中显示的方法,涉及php中unpack、fopen、fread等方法及图形操作的相关技巧,需要的朋友可以参考下

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:

$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 $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:

php实现将wav文件转换成图像文件并在页面中显示的方法

希望本文所述对大家的php程序设计有所帮助。

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