<?php
/////////////////////////////////////////////////////////////////
/// getID3() by James Heinrich <info@getid3.org> //
// available at http://getid3.sourceforge.net //
// or http://www.getid3.org //
/////////////////////////////////////////////////////////////////
// See readme.txt for more details //
/////////////////////////////////////////////////////////////////
// //
// module.graphic.pcd.php //
// module for analyzing PhotoCD (PCD) Image files //
// dependencies: NONE //
// ///
/////////////////////////////////////////////////////////////////
class getid3_pcd extends getid3_handler
{
var $ExtractData = 0;
function Analyze() {
$info = &$this->getid3->info;
$info['fileformat'] = 'pcd';
$info['video']['dataformat'] = 'pcd';
$info['video']['lossless'] = false;
fseek($this->getid3->fp, $info['avdataoffset'] + 72, SEEK_SET);
$PCDflags = fread($this->getid3->fp, 1);
$PCDisVertical = ((ord($PCDflags) & 0x01) ? true : false);
if ($PCDisVertical) {
$info['video']['resolution_x'] = 3072;
$info['video']['resolution_y'] = 2048;
} else {
$info['video']['resolution_x'] = 2048;
$info['video']['resolution_y'] = 3072;
}
if ($this->ExtractData > 3) {
$info['error'][] = 'Cannot extract PSD image data for detail levels above BASE (level-3) because encrypted with Kodak-proprietary compression/encryption.';
} elseif ($this->ExtractData > 0) {
$PCD_levels[1] = array( 192, 128, 0x02000); // BASE/16
$PCD_levels[2] = array( 384, 256, 0x0B800); // BASE/4
$PCD_levels[3] = array( 768, 512, 0x30000); // BASE
//$PCD_levels[4] = array(1536, 1024, ??); // BASE*4 - encrypted with Kodak-proprietary compression/encryption
//$PCD_levels[5] = array(3072, 2048, ??); // BASE*16 - encrypted with Kodak-proprietary compression/encryption
//$PCD_levels[6] = array(6144, 4096, ??); // BASE*64 - encrypted with Kodak-proprietary compression/encryption; PhotoCD-Pro only
list($PCD_width, $PCD_height, $PCD_dataOffset) = $PCD_levels[3];
fseek($this->getid3->fp, $info['avdataoffset'] + $PCD_dataOffset, SEEK_SET);
for ($y = 0; $y < $PCD_height; $y += 2) {
// The image-data of these subtypes start at the respective offsets of 02000h, 0b800h and 30000h.
// To decode the YcbYr to the more usual RGB-code, three lines of data have to be read, each
// consisting of ‘w’ bytes, where ‘w’ is the width of the image-subtype. The first ‘w’ bytes and
// the first half of the third ‘w’ bytes contain data for the first RGB-line, the second ‘w’ bytes
// and the second half of the third ‘w’ bytes contain data for a second RGB-line.
$PCD_data_Y1 = fread($this->getid3->fp, $PCD_width);
$PCD_data_Y2 = fread($this->getid3->fp, $PCD_width);
$PCD_data_Cb = fread($this->getid3->fp, intval(round($PCD_width / 2)));
$PCD_data_Cr = fread($this->getid3->fp, intval(round($PCD_width / 2)));
for ($x = 0; $x < $PCD_width; $x++) {
if ($PCDisVertical) {
$info['pcd']['data'][$PCD_width - $x][$y] = $this->YCbCr2RGB(ord($PCD_data_Y1{$x}), ord($PCD_data_Cb{floor($x / 2)}), ord($PCD_data_Cr{floor($x / 2)}));
$info['pcd']['data'][$PCD_width - $x][$y + 1] = $this->YCbCr2RGB(ord($PCD_data_Y2{$x}), ord($PCD_data_Cb{floor($x / 2)}), ord($PCD_data_Cr{floor($x / 2)}));
} else {
$info['pcd']['data'][$y][$x] = $this->YCbCr2RGB(ord($PCD_data_Y1{$x}), ord($PCD_data_Cb{floor($x / 2)}), ord($PCD_data_Cr{floor($x / 2)}));
$info['pcd']['data'][$y + 1][$x] = $this->YCbCr2RGB(ord($PCD_data_Y2{$x}), ord($PCD_data_Cb{floor($x / 2)}), ord($PCD_data_Cr{floor($x / 2)}));
}
}
}
// Example for plotting extracted data
//getid3_lib::IncludeDependency(GETID3_INCLUDEPATH.'module.audio.ac3.php', __FILE__, true);
//if ($PCDisVertical) {
// $BMPinfo['resolution_x'] = $PCD_height;
// $BMPinfo['resolution_y'] = $PCD_width;
//} else {
// $BMPinfo['resolution_x'] = $PCD_width;
// $BMPinfo['resolution_y'] = $PCD_height;
//}
//$BMPinfo['bmp']['data'] = $info['pcd']['data'];
//getid3_bmp::PlotBMP($BMPinfo);
//exit;
}
}
function YCbCr2RGB($Y, $Cb, $Cr) {
static $YCbCr_constants = array();
if (empty($YCbCr_constants)) {
$YCbCr_constants['red']['Y'] = 0.0054980 * 256;
$YCbCr_constants['red']['Cb'] = 0.0000000 * 256;
$YCbCr_constants['red']['Cr'] = 0.0051681 * 256;
$YCbCr_constants['green']['Y'] = 0.0054980 * 256;
$YCbCr_constants['green']['Cb'] = -0.0015446 * 256;
$YCbCr_constants['green']['Cr'] = -0.0026325 * 256;
$YCbCr_constants['blue']['Y'] = 0.0054980 * 256;
$YCbCr_constants['blue']['Cb'] = 0.0079533 * 256;
$YCbCr_constants['blue']['Cr'] = 0.0000000 * 256;
}
$RGBcolor = array('red'=>0, 'green'=>0, 'blue'=>0);
foreach ($RGBcolor as $rgbname => $dummy) {
$RGBcolor[$rgbname] = max(0,
min(255,
intval(
round(
($YCbCr_constants[$rgbname]['Y'] * $Y) +
($YCbCr_constants[$rgbname]['Cb'] * ($Cb - 156)) +
($YCbCr_constants[$rgbname]['Cr'] * ($Cr - 137))
)
)
)
);
}
return (($RGBcolor['red'] * 65536) + ($RGBcolor['green'] * 256) + $RGBcolor['blue']);
}
}
?>
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