[3318] | 1 | <?php |
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| 2 | // +----------------------------------------------------------------------+ |
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| 3 | // | PHP version 5 | |
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| 4 | // +----------------------------------------------------------------------+ |
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| 5 | // | Copyright (c) 2002-2006 James Heinrich, Allan Hansen | |
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| 6 | // +----------------------------------------------------------------------+ |
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| 7 | // | This source file is subject to version 2 of the GPL license, | |
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| 8 | // | that is bundled with this package in the file license.txt and is | |
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| 9 | // | available through the world-wide-web at the following url: | |
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| 10 | // | http://www.gnu.org/copyleft/gpl.html | |
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| 11 | // +----------------------------------------------------------------------+ |
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| 12 | // | getID3() - http://getid3.sourceforge.net or http://www.getid3.org | |
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| 13 | // +----------------------------------------------------------------------+ |
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| 14 | // | Authors: James Heinrich <infoØgetid3*org> | |
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| 15 | // | Allan Hansen <ahØartemis*dk> | |
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| 16 | // +----------------------------------------------------------------------+ |
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| 17 | // | module.audio-video.nsv.php | |
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| 18 | // | module for analyzing Nullsoft NSV files | |
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| 19 | // | dependencies: NONE | |
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| 20 | // +----------------------------------------------------------------------+ |
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| 21 | // |
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| 22 | // $Id: module.audio-video.nsv.php 3318 2009-05-20 21:54:10Z vdigital $ |
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| 23 | |
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| 24 | |
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| 25 | |
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| 26 | class getid3_nsv extends getid3_handler |
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| 27 | { |
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| 28 | |
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| 29 | public function Analyze() { |
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| 30 | |
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| 31 | $getid3 = $this->getid3; |
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| 32 | |
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| 33 | $getid3->info['fileformat'] = 'nsv'; |
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| 34 | $getid3->info['audio']['dataformat'] = 'nsv'; |
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| 35 | $getid3->info['video']['dataformat'] = 'nsv'; |
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| 36 | $getid3->info['audio']['lossless'] = false; |
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| 37 | $getid3->info['video']['lossless'] = false; |
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| 38 | |
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| 39 | fseek($getid3->fp, $getid3->info['avdataoffset'], SEEK_SET); |
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| 40 | $nsv_header = fread($getid3->fp, 4); |
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| 41 | |
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| 42 | switch ($nsv_header) { |
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| 43 | |
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| 44 | case 'NSVs': |
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| 45 | $this->getNSVsHeader(); |
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| 46 | break; |
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| 47 | |
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| 48 | case 'NSVf': |
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| 49 | if ($this->getNSVfHeader()) { |
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| 50 | $this->getNSVsHeader($getid3->info['nsv']['NSVf']['header_length']); |
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| 51 | } |
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| 52 | break; |
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| 53 | |
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| 54 | default: |
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| 55 | throw new getid3_exception('Expecting "NSVs" or "NSVf" at offset '.$getid3->info['avdataoffset'].', found "'.$nsv_header.'"'); |
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| 56 | break; |
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| 57 | } |
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| 58 | |
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| 59 | if (!isset($getid3->info['nsv']['NSVf'])) { |
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| 60 | $getid3->warning('NSVf header not present - cannot calculate playtime or bitrate'); |
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| 61 | } |
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| 62 | |
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| 63 | return true; |
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| 64 | } |
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| 65 | |
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| 66 | |
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| 67 | |
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| 68 | private function getNSVsHeader($file_offset = 0) { |
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| 69 | |
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| 70 | $getid3 = $this->getid3; |
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| 71 | |
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| 72 | fseek($getid3->fp, $file_offset, SEEK_SET); |
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| 73 | $nsvs_header = fread($getid3->fp, 28); |
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| 74 | |
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| 75 | $getid3->info['nsv']['NSVs'] = array (); |
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| 76 | $info_nsv_NSVs = &$getid3->info['nsv']['NSVs']; |
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| 77 | |
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| 78 | $info_nsv_NSVs['identifier'] = substr($nsvs_header, 0, 4); |
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| 79 | if ($info_nsv_NSVs['identifier'] != 'NSVs') { |
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| 80 | throw new getid3_exception('expected "NSVs" at offset ('.$file_offset.'), found "'.$info_nsv_NSVs['identifier'].'" instead'); |
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| 81 | } |
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| 82 | |
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| 83 | $info_nsv_NSVs['offset'] = $file_offset; |
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| 84 | |
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| 85 | getid3_lib::ReadSequence('LittleEndian2Int', $info_nsv_NSVs, $nsvs_header, 4, |
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| 86 | array ( |
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| 87 | 'video_codec' => -4, // string |
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| 88 | 'audio_codec' => -4, // string |
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| 89 | 'resolution_x' => 2, |
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| 90 | 'resolution_y' => 2, |
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| 91 | 'framerate_index' => 1, |
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| 92 | ) |
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| 93 | ); |
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| 94 | |
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| 95 | if ($info_nsv_NSVs['audio_codec'] == 'PCM ') { |
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| 96 | |
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| 97 | getid3_lib::ReadSequence('LittleEndian2Int', $info_nsv_NSVs, $nsvs_header, 24, |
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| 98 | array ( |
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| 99 | 'bits_channel' => 1, |
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| 100 | 'channels' => 1, |
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| 101 | 'sample_rate' => 2 |
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| 102 | ) |
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| 103 | ); |
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| 104 | $getid3->info['audio']['sample_rate'] = $info_nsv_NSVs['sample_rate']; |
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| 105 | |
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| 106 | } |
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| 107 | |
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| 108 | $getid3->info['video']['resolution_x'] = $info_nsv_NSVs['resolution_x']; |
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| 109 | $getid3->info['video']['resolution_y'] = $info_nsv_NSVs['resolution_y']; |
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| 110 | $info_nsv_NSVs['frame_rate'] = getid3_nsv::NSVframerateLookup($info_nsv_NSVs['framerate_index']); |
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| 111 | $getid3->info['video']['frame_rate'] = $info_nsv_NSVs['frame_rate']; |
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| 112 | $getid3->info['video']['bits_per_sample'] = 24; |
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| 113 | $getid3->info['video']['pixel_aspect_ratio'] = (float)1; |
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| 114 | |
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| 115 | return true; |
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| 116 | } |
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| 117 | |
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| 118 | |
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| 119 | |
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| 120 | private function getNSVfHeader($file_offset = 0, $get_toc_offsets=false) { |
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| 121 | |
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| 122 | $getid3 = $this->getid3; |
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| 123 | |
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| 124 | fseek($getid3->fp, $file_offset, SEEK_SET); |
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| 125 | $nsvf_header = fread($getid3->fp, 28); |
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| 126 | |
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| 127 | $getid3->info['nsv']['NSVf'] = array (); |
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| 128 | $info_nsv_NSVf = &$getid3->info['nsv']['NSVf']; |
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| 129 | |
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| 130 | $info_nsv_NSVf['identifier'] = substr($nsvf_header, 0, 4); |
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| 131 | if ($info_nsv_NSVf['identifier'] != 'NSVf') { |
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| 132 | throw new getid3_exception('expected "NSVf" at offset ('.$file_offset.'), found "'.$info_nsv_NSVf['identifier'].'" instead'); |
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| 133 | } |
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| 134 | |
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| 135 | $getid3->info['nsv']['NSVs']['offset'] = $file_offset; |
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| 136 | |
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| 137 | getid3_lib::ReadSequence('LittleEndian2Int', $info_nsv_NSVf, $nsvf_header, 4, |
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| 138 | array ( |
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| 139 | 'header_length' => 4, |
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| 140 | 'file_size' => 4, |
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| 141 | 'playtime_ms' => 4, |
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| 142 | 'meta_size' => 4, |
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| 143 | 'TOC_entries_1' => 4, |
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| 144 | 'TOC_entries_2' => 4 |
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| 145 | ) |
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| 146 | ); |
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| 147 | |
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| 148 | if ($info_nsv_NSVf['playtime_ms'] == 0) { |
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| 149 | throw new getid3_exception('Corrupt NSV file: NSVf.playtime_ms == zero'); |
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| 150 | } |
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| 151 | |
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| 152 | if ($info_nsv_NSVf['file_size'] > $getid3->info['avdataend']) { |
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| 153 | $getid3->warning('truncated file - NSVf header indicates '.$info_nsv_NSVf['file_size'].' bytes, file actually '.$getid3->info['avdataend'].' bytes'); |
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| 154 | } |
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| 155 | |
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| 156 | $nsvf_header .= fread($getid3->fp, $info_nsv_NSVf['meta_size'] + (4 * $info_nsv_NSVf['TOC_entries_1']) + (4 * $info_nsv_NSVf['TOC_entries_2'])); |
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| 157 | $nsvf_headerlength = strlen($nsvf_header); |
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| 158 | $info_nsv_NSVf['metadata'] = substr($nsvf_header, 28, $info_nsv_NSVf['meta_size']); |
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| 159 | |
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| 160 | $offset = 28 + $info_nsv_NSVf['meta_size']; |
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| 161 | if ($get_toc_offsets) { |
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| 162 | $toc_counter = 0; |
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| 163 | while ($toc_counter < $info_nsv_NSVf['TOC_entries_1']) { |
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| 164 | if ($toc_counter < $info_nsv_NSVf['TOC_entries_1']) { |
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| 165 | $info_nsv_NSVf['TOC_1'][$toc_counter] = getid3_lib::LittleEndian2Int(substr($nsvf_header, $offset, 4)); |
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| 166 | $offset += 4; |
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| 167 | $toc_counter++; |
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| 168 | } |
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| 169 | } |
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| 170 | } |
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| 171 | |
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| 172 | if (trim($info_nsv_NSVf['metadata']) != '') { |
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| 173 | $info_nsv_NSVf['metadata'] = str_replace('`', "\x01", $info_nsv_NSVf['metadata']); |
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| 174 | $comment_pair_array = explode("\x01".' ', $info_nsv_NSVf['metadata']); |
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| 175 | foreach ($comment_pair_array as $comment_pair) { |
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| 176 | if (strstr($comment_pair, '='."\x01")) { |
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| 177 | list($key, $value) = explode('='."\x01", $comment_pair, 2); |
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| 178 | $getid3->info['nsv']['comments'][strtolower($key)][] = trim(str_replace("\x01", '', $value)); |
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| 179 | } |
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| 180 | } |
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| 181 | } |
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| 182 | |
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| 183 | $getid3->info['playtime_seconds'] = $info_nsv_NSVf['playtime_ms'] / 1000; |
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| 184 | $getid3->info['bitrate'] = ($info_nsv_NSVf['file_size'] * 8) / $getid3->info['playtime_seconds']; |
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| 185 | |
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| 186 | return true; |
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| 187 | } |
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| 188 | |
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| 189 | |
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| 190 | |
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| 191 | public static function NSVframerateLookup($frame_rate_index) { |
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| 192 | |
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| 193 | if ($frame_rate_index <= 127) { |
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| 194 | return (float)$frame_rate_index; |
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| 195 | } |
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| 196 | |
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| 197 | static $lookup = array ( |
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| 198 | 129 => 29.970, |
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| 199 | 131 => 23.976, |
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| 200 | 133 => 14.985, |
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| 201 | 197 => 59.940, |
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| 202 | 199 => 47.952 |
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| 203 | ); |
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| 204 | return (isset($lookup[$frame_rate_index]) ? $lookup[$frame_rate_index] : false); |
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| 205 | } |
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| 206 | |
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| 207 | } |
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| 208 | |
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| 209 | |
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| 210 | ?> |
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