PHP method to convert wav files into image files and display them on the page_PHP tutorial

How to convert wav files into image files in php and display them on the page

This article describes the example of how php converts wav files into image files and displays them on the page method. Share it with everyone for your reference. The specific analysis is as follows:

Requirement: Convert wav files to png files and display them.

　Wav_To_Png.php：

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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'); ?>

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<🎜>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'); ?>

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