?>
</td>
<td>
<?php
echo T_('This tests whether you have the simplexml extension enabled. This is not strictly necessary, but may result in a better experience.');
?>
</td>
</tr>
<tr>
<td valign="top"><?php
echo T_('PHP GD extension');
?>
</td>
<td valign="top">
<?php
echo debug_wresult(check_php_gd());
?>
</td>
<td>
<?php
echo T_('This tests whether you have the GD extension enabled. This is not strictly necessary, but may result in a better experience.');
?>
</td>
</tr>
<tr>
<td valign="top"><?php
echo T_('PHP safe mode disabled');
?>
</td>
<td valign="top">
<?php
function check_php_requirements()
{
$result = array();
$result[] = check_php_version();
$result[] = check_php_memory_limit();
$result[] = check_php_post_max_size();
$result[] = check_php_upload_max_filesize();
$result[] = check_php_max_execution_time();
$result[] = check_php_max_input_time();
$result[] = check_php_timezone();
$result[] = check_php_databases();
$result[] = check_php_bc();
$result[] = check_php_mbstring();
$result[] = check_php_sockets();
$result[] = check_php_session();
$result[] = check_php_gd();
$result[] = check_php_gd_png();
$result[] = check_php_xml();
$result[] = check_php_ctype();
return $result;
}
/**
* Create waveform from song file.
* @param string $filename
* @return binary|string|null
*/
protected static function create_waveform($filename)
{
if (!file_exists($filename)) {
debug_event('waveform', 'File ' . $filename . ' doesn\'t exists', 1);
return null;
}
if (!check_php_gd()) {
debug_event('waveform', 'GD extension must be loaded', 1);
return null;
}
$detail = 5;
$width = 400;
$height = 32;
$foreground = AmpConfig::get('waveform_color') ?: '#FF0000';
$background = '';
$draw_flat = true;
// generate foreground color
list($r, $g, $b) = self::html2rgb($foreground);
$handle = fopen($filename, "r");
// wav file header retrieval
$heading = array();
$heading[] = fread($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
$data_size = floor((Core::get_filesize($filename) - 44) / ($ratio + $byte) + 1);
$data_point = 0;
// 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, $height);
// fill background of image
if ($background == "") {
// transparent background specified
imagesavealpha($img, true);
$transparentColor = imagecolorallocatealpha($img, 0, 0, 0, 127);
imagefill($img, 0, 0, $transparentColor);
} else {
list($br, $bg, $bb) = self::html2rgb($background);
imagefilledrectangle($img, 0, 0, (int) ($data_size / $detail), $height, imagecolorallocate($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:
$data = self::findValues($bytes[0], $bytes[1]);
break;
// get value for 16-bit wav
// get value for 16-bit wav
case 2:
if (ord($bytes[1]) & 128) {
$temp = 0;
} else {
$temp = 128;
}
$temp = chr((ord($bytes[1]) & 127) + $temp);
$data = floor(self::findValues($bytes[0], $temp) / 256);
break;
default:
$data = 0;
break;
}
// skip bytes for memory optimization
fseek($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, (int) ($data_point / $detail), $height - $v, (int) ($data_point / $detail), $height - ($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);
ob_start();
// 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);
}
imagedestroy($img);
$imgdata = ob_get_contents();
ob_clean();
return $imgdata;
}
