module.graphic.pcd.php

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<?php
//  available at http://getid3.sourceforge.net                 //
//            or http://www.getid3.org                         //
//          also https://github.com/JamesHeinrich/getID3       //
// 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
{
        public $ExtractData = 0;

        public function Analyze() {
                $info = &$this->getid3->info;

                $info['fileformat']          = 'pcd';
                $info['video']['dataformat'] = 'pcd';
                $info['video']['lossless']   = false;


                $this->fseek($info['avdataoffset'] + 72);

                $PCDflags = $this->fread(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) {

                        $this->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];

                        $this->fseek($info['avdataoffset'] + $PCD_dataOffset);

                        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 = $this->fread($PCD_width);
                                $PCD_data_Y2 = $this->fread($PCD_width);
                                $PCD_data_Cb = $this->fread(intval(round($PCD_width / 2)));
                                $PCD_data_Cr = $this->fread(intval(round($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;

                }

        }

        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']);
        }

}