Created
July 22, 2010 19:12
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<?php | |
class wave { | |
var $fp, $filesize; | |
var $data, $blocktotal, $blockfmt, $blocksize; | |
function __construct($file) { | |
if(!$this->fp = @fopen($file, 'rb')) { | |
return false; | |
} | |
$this->filesize = filesize($file); | |
} | |
function wavechunk() { | |
rewind($this->fp); | |
$riff_fmt = 'a4ID/VSize/a4Type'; | |
$riff_cnk = @unpack($riff_fmt, fread($this->fp, 12)); | |
if($riff_cnk['ID'] != 'RIFF' || $riff_cnk['Type'] != 'WAVE') { | |
return -1; | |
} | |
$format_header_fmt = 'a4ID/VSize'; | |
$format_header_cnk = @unpack($format_header_fmt, fread($this->fp, 8)); | |
if($format_header_cnk['ID'] != 'fmt ' || !in_array($format_header_cnk['Size'], array(16, 18))) { | |
return -2; | |
} | |
$format_fmt = 'vFormatTag/vChannels/VSamplesPerSec/VAvgBytesPerSec/vBlockAlign/vBitsPerSample'.($format_header_cnk['Size'] == 18 ? '/vExtra' : ''); | |
$format_cnk = @unpack($format_fmt, fread($this->fp, $format_header_cnk['Size'])); | |
if($format_cnk['FormatTag'] != 1) { | |
return -3; | |
} | |
if(!in_array($format_cnk['Channels'], array(1, 2))) { | |
return -4; | |
} | |
$fact_fmt = 'a4ID/VSize/Vdata'; | |
$fact_cnk = @unpack($fact_fmt, fread($this->fp, 12)); | |
if($fact_cnk['ID'] != 'fact') { | |
fseek($this->fp, ftell($this->fp) - 12); | |
} | |
$data_fmt = 'a4ID/VSize'; | |
$data_cnk = @unpack($data_fmt, fread($this->fp, 8)); | |
if($data_cnk['ID'] != 'data') { | |
return -5; | |
} | |
if($data_cnk['Size'] % $format_cnk['BlockAlign'] != 0) { | |
return -6; | |
} | |
$this->data = fread($this->fp, $data_cnk['Size']); | |
$this->blockfmt = $format_cnk['Channels'] == 1 ? 'sLeft' : 'sLeft/sRight'; | |
$this->blocktotal = $data_cnk['Size'] / 4; | |
$this->blocksize = $format_cnk['BlockAlign']; | |
$return = array | |
( | |
'Channels' => $format_cnk['Channels'], | |
'SamplesPerSec' => $format_cnk['SamplesPerSec'], | |
'AvgBytesPerSec' => $format_cnk['AvgBytesPerSec'], | |
'BlockAlign' => $format_cnk['BlockAlign'], | |
'BitsPerSample' => $format_cnk['BitsPerSample'], | |
'Extra' => $format_cnk['Extra'], | |
'seconds' => ($data_cnk['Size'] / $format_cnk['AvgBytesPerSec']) | |
); | |
return $return; | |
} | |
function waveimage($channel = 'Left', $width = 1000, $height = 300, $bgcolor = array(255, 255, 255), $cenlinecolor = array(180, 180, 180), $imgcolor = array(0, 0, 0)) { | |
if(!$this->data) { | |
if(!is_array($this->wavechunk())) { | |
return false; | |
} | |
} | |
$width = max(10, $width); | |
$height = max(10, $height); | |
$border = 1; | |
$center = ($height - $border * 2) / 2; | |
$num_merge = max(1, round($this->blocktotal / $width)); | |
$width = min($width, ceil($this->blocktotal / $num_merge)); | |
$max = $min = 0; | |
$x = 1; | |
$pixels = array(); | |
$wavetotal = 0; | |
for($i = 0; $i < $this->blocktotal; $i++) { | |
$blocks[] = @unpack($this->blockfmt, substr($this->data, $i * 4, $this->blocksize)); | |
} | |
if(!isset($blocks[0][$channel])) { | |
return false; | |
} | |
for($i = 0; $i < $this->blocktotal; ) { | |
for($j = 0; $j < $num_merge; $j++) { | |
if(isset($blocks[$i + $j])) { | |
$wavetotal += $blocks[$i + $j][$channel]; | |
} | |
} | |
$y = round($wavetotal / ($j + 1)); | |
$pixels[] = array($x, $y); | |
$max = max($max, $y); | |
$min = min($min, $y); | |
$x++; | |
$i += $num_merge; | |
$wavetotal = 0; | |
} | |
$maxblock = max(abs($max), abs($min)); | |
$zoom = $maxblock / $center; | |
$im = imagecreate($width, $height); | |
$background = imagecolorallocate($im, $bgcolor[0], $bgcolor[1], $bgcolor[2]); | |
if($cenlinecolor) { | |
$cenline = imagecolorallocate($im, $cenlinecolor[0], $cenlinecolor[1], $cenlinecolor[2]); | |
imageline($im, 1, $center, $width, $center, $cenline); | |
} | |
$color = imagecolorallocate($im, $imgcolor[0], $imgcolor[1], $imgcolor[2]); | |
$y_old = 0; | |
foreach($pixels as $pixel) { | |
$y = $center - round($pixel[1] / $zoom); | |
imagesetpixel($im, $pixel[0], $y, $color); | |
if($pixel[0] > 1) { | |
imageline($im, $pixel[0] - 1, $y_old, $pixel[0], $y, $color); | |
} | |
$y_old = $y; | |
} | |
return $im; | |
} | |
} | |
?> |
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