Pcd.php

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<?php
 
namespace GetId3\Module\Graphic;
 
use GetId3\Handler\BaseHandler;
 
//  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 Pcd extends BaseHandler
{
    public $ExtractData = 0;
 
    public 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(GetId3Core::getIncludePath().'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;
 
        }
 
    }
 
    public 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']);
    }
 
}