rlm@3: <?php
rlm@3: // +----------------------------------------------------------------------+
rlm@3: // | PHP version 5                                                        |
rlm@3: // +----------------------------------------------------------------------+
rlm@3: // | Copyright (c) 2002-2006 James Heinrich, Allan Hansen                 |
rlm@3: // +----------------------------------------------------------------------+
rlm@3: // | This source file is subject to version 2 of the GPL license,         |
rlm@3: // | that is bundled with this package in the file license.txt and is     |
rlm@3: // | available through the world-wide-web at the following url:           |
rlm@3: // | http://www.gnu.org/copyleft/gpl.html                                 |
rlm@3: // +----------------------------------------------------------------------+
rlm@3: // | getID3() - http://getid3.sourceforge.net or http://www.getid3.org    |
rlm@3: // +----------------------------------------------------------------------+
rlm@3: // | Authors: James Heinrich <infoØgetid3*org>                            |
rlm@3: // |          Allan Hansen <ahØartemis*dk>                                |
rlm@3: // +----------------------------------------------------------------------+
rlm@3: // | module.audio-video.nsv.php                                           |
rlm@3: // | module for analyzing Nullsoft NSV files                              |
rlm@3: // | dependencies: NONE                                                   |
rlm@3: // +----------------------------------------------------------------------+
rlm@3: //
rlm@3: // $Id: module.audio-video.nsv.php,v 1.3 2006/11/02 10:48:00 ah Exp $
rlm@3: 
rlm@3:         
rlm@3:         
rlm@3: class getid3_nsv extends getid3_handler
rlm@3: {
rlm@3: 
rlm@3:     public function Analyze() {
rlm@3: 
rlm@3:         $getid3 = $this->getid3;
rlm@3: 
rlm@3:         $getid3->info['fileformat']          = 'nsv';
rlm@3:         $getid3->info['audio']['dataformat'] = 'nsv';
rlm@3:         $getid3->info['video']['dataformat'] = 'nsv';
rlm@3:         $getid3->info['audio']['lossless']   = false;
rlm@3:         $getid3->info['video']['lossless']   = false;
rlm@3: 
rlm@3:         fseek($getid3->fp, $getid3->info['avdataoffset'], SEEK_SET);
rlm@3:         $nsv_header = fread($getid3->fp, 4);
rlm@3: 
rlm@3:         switch ($nsv_header) {
rlm@3:             
rlm@3:             case 'NSVs':
rlm@3:                 $this->getNSVsHeader();
rlm@3:                 break;
rlm@3: 
rlm@3:             case 'NSVf':
rlm@3:                 if ($this->getNSVfHeader()) {
rlm@3:                         $this->getNSVsHeader($getid3->info['nsv']['NSVf']['header_length']);
rlm@3:                 }
rlm@3:                 break;
rlm@3: 
rlm@3:             default:
rlm@3:                 throw new getid3_exception('Expecting "NSVs" or "NSVf" at offset '.$getid3->info['avdataoffset'].', found "'.$nsv_header.'"');
rlm@3:                 break;
rlm@3:         }
rlm@3: 
rlm@3:         if (!isset($getid3->info['nsv']['NSVf'])) {
rlm@3:             $getid3->warning('NSVf header not present - cannot calculate playtime or bitrate');
rlm@3:         }
rlm@3: 
rlm@3:         return true;
rlm@3:     }
rlm@3: 
rlm@3: 
rlm@3: 
rlm@3:     private function getNSVsHeader($file_offset = 0) {
rlm@3:         
rlm@3:         $getid3 = $this->getid3;
rlm@3:         
rlm@3:         fseek($getid3->fp, $file_offset, SEEK_SET);
rlm@3:         $nsvs_header = fread($getid3->fp, 28);
rlm@3:         
rlm@3:         $getid3->info['nsv']['NSVs'] = array ();
rlm@3:         $info_nsv_NSVs = &$getid3->info['nsv']['NSVs'];
rlm@3: 
rlm@3:         $info_nsv_NSVs['identifier'] = substr($nsvs_header, 0, 4);
rlm@3:         if ($info_nsv_NSVs['identifier'] != 'NSVs') {
rlm@3:             throw new getid3_exception('expected "NSVs" at offset ('.$file_offset.'), found "'.$info_nsv_NSVs['identifier'].'" instead');
rlm@3:         }
rlm@3:         
rlm@3:         $info_nsv_NSVs['offset'] = $file_offset;
rlm@3:         
rlm@3:         getid3_lib::ReadSequence('LittleEndian2Int', $info_nsv_NSVs, $nsvs_header, 4,
rlm@3:             array (
rlm@3:                 'video_codec'     => -4,    // string
rlm@3:                 'audio_codec'     => -4,    // string
rlm@3:                 'resolution_x'    => 2,
rlm@3:                 'resolution_y'    => 2,
rlm@3:                 'framerate_index' => 1,
rlm@3:             )
rlm@3:         );
rlm@3: 
rlm@3:         if ($info_nsv_NSVs['audio_codec'] == 'PCM ') {
rlm@3:         
rlm@3:             getid3_lib::ReadSequence('LittleEndian2Int', $info_nsv_NSVs, $nsvs_header, 24,
rlm@3:                 array (
rlm@3:                     'bits_channel' => 1,
rlm@3:                     'channels'     => 1,
rlm@3:                     'sample_rate'  => 2
rlm@3:                 )
rlm@3:             );
rlm@3:             $getid3->info['audio']['sample_rate'] = $info_nsv_NSVs['sample_rate'];
rlm@3:             
rlm@3:         }
rlm@3: 
rlm@3:         $getid3->info['video']['resolution_x']       = $info_nsv_NSVs['resolution_x'];
rlm@3:         $getid3->info['video']['resolution_y']       = $info_nsv_NSVs['resolution_y'];
rlm@3:         $info_nsv_NSVs['frame_rate']                 = getid3_nsv::NSVframerateLookup($info_nsv_NSVs['framerate_index']);
rlm@3:         $getid3->info['video']['frame_rate']         = $info_nsv_NSVs['frame_rate'];
rlm@3:         $getid3->info['video']['bits_per_sample']    = 24;
rlm@3:         $getid3->info['video']['pixel_aspect_ratio'] = (float)1;
rlm@3: 
rlm@3:         return true;
rlm@3:     }
rlm@3: 
rlm@3: 
rlm@3: 
rlm@3:     private function getNSVfHeader($file_offset = 0, $get_toc_offsets=false) {
rlm@3:         
rlm@3:         $getid3 = $this->getid3;
rlm@3:         
rlm@3:         fseek($getid3->fp, $file_offset, SEEK_SET);
rlm@3:         $nsvf_header = fread($getid3->fp, 28);
rlm@3:         
rlm@3:         $getid3->info['nsv']['NSVf'] = array ();
rlm@3:         $info_nsv_NSVf = &$getid3->info['nsv']['NSVf'];
rlm@3:         
rlm@3:         $info_nsv_NSVf['identifier'] = substr($nsvf_header, 0, 4);
rlm@3:         if ($info_nsv_NSVf['identifier'] != 'NSVf') {
rlm@3:             throw new getid3_exception('expected "NSVf" at offset ('.$file_offset.'), found "'.$info_nsv_NSVf['identifier'].'" instead');
rlm@3:         }
rlm@3: 
rlm@3:         $getid3->info['nsv']['NSVs']['offset']        = $file_offset;
rlm@3: 
rlm@3:         getid3_lib::ReadSequence('LittleEndian2Int', $info_nsv_NSVf, $nsvf_header, 4,
rlm@3:             array (
rlm@3:                 'header_length' => 4,
rlm@3:                 'file_size'     => 4,
rlm@3:                 'playtime_ms'   => 4,
rlm@3:                 'meta_size'     => 4,
rlm@3:                 'TOC_entries_1' => 4,
rlm@3:                 'TOC_entries_2' => 4
rlm@3:             )
rlm@3:         );
rlm@3:                 
rlm@3:         if ($info_nsv_NSVf['playtime_ms'] == 0) {
rlm@3:             throw new getid3_exception('Corrupt NSV file: NSVf.playtime_ms == zero');
rlm@3:         }
rlm@3:         
rlm@3:         if ($info_nsv_NSVf['file_size'] > $getid3->info['avdataend']) {
rlm@3:             $getid3->warning('truncated file - NSVf header indicates '.$info_nsv_NSVf['file_size'].' bytes, file actually '.$getid3->info['avdataend'].' bytes');
rlm@3:         }
rlm@3: 
rlm@3:         $nsvf_header .= fread($getid3->fp, $info_nsv_NSVf['meta_size'] + (4 * $info_nsv_NSVf['TOC_entries_1']) + (4 * $info_nsv_NSVf['TOC_entries_2']));
rlm@3:         $nsvf_headerlength = strlen($nsvf_header);
rlm@3:         $info_nsv_NSVf['metadata'] = substr($nsvf_header, 28, $info_nsv_NSVf['meta_size']);
rlm@3: 
rlm@3:         $offset = 28 + $info_nsv_NSVf['meta_size'];
rlm@3:         if ($get_toc_offsets) {
rlm@3:             $toc_counter = 0;
rlm@3:             while ($toc_counter < $info_nsv_NSVf['TOC_entries_1']) {
rlm@3:                 if ($toc_counter < $info_nsv_NSVf['TOC_entries_1']) {
rlm@3:                     $info_nsv_NSVf['TOC_1'][$toc_counter] = getid3_lib::LittleEndian2Int(substr($nsvf_header, $offset, 4));
rlm@3:                     $offset += 4;
rlm@3:                     $toc_counter++;
rlm@3:                 }
rlm@3:             }
rlm@3:         }
rlm@3: 
rlm@3:         if (trim($info_nsv_NSVf['metadata']) != '') {
rlm@3:             $info_nsv_NSVf['metadata'] = str_replace('`', "\x01", $info_nsv_NSVf['metadata']);
rlm@3:             $comment_pair_array = explode("\x01".' ', $info_nsv_NSVf['metadata']);
rlm@3:             foreach ($comment_pair_array as $comment_pair) {
rlm@3:                 if (strstr($comment_pair, '='."\x01")) {
rlm@3:                     list($key, $value) = explode('='."\x01", $comment_pair, 2);
rlm@3:                     $getid3->info['nsv']['comments'][strtolower($key)][] = trim(str_replace("\x01", '', $value));
rlm@3:                 }
rlm@3:             }
rlm@3:         }
rlm@3: 
rlm@3:         $getid3->info['playtime_seconds'] = $info_nsv_NSVf['playtime_ms'] / 1000;
rlm@3:         $getid3->info['bitrate']          = ($info_nsv_NSVf['file_size'] * 8) / $getid3->info['playtime_seconds'];
rlm@3: 
rlm@3:         return true;
rlm@3:     }
rlm@3: 
rlm@3: 
rlm@3: 
rlm@3:     public static function NSVframerateLookup($frame_rate_index) {
rlm@3:         
rlm@3:         if ($frame_rate_index <= 127) {
rlm@3:             return (float)$frame_rate_index;
rlm@3:         }
rlm@3: 
rlm@3:         static $lookup = array (
rlm@3:             129 => 29.970,
rlm@3:             131 => 23.976,
rlm@3:             133 => 14.985,
rlm@3:             197 => 59.940,
rlm@3:             199 => 47.952
rlm@3:         );
rlm@3:         return (isset($lookup[$frame_rate_index]) ? $lookup[$frame_rate_index] : false);
rlm@3:     }
rlm@3: 
rlm@3: }
rlm@3: 
rlm@3: 
rlm@3: ?>