ILIAS  release_5-1 Revision 5.0.0-5477-g43f3e3fab5f
module.audio-video.nsv.php
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1<?php
4// available at http://getid3.sourceforge.net //
5// or http://www.getid3.org //
7// See readme.txt for more details //
9// //
10// module.audio.nsv.php //
11// module for analyzing Nullsoft NSV files //
12// dependencies: NONE //
13// ///
15
16
17class getid3_nsv
18{
19
20 function getid3_nsv(&$fd, &$ThisFileInfo) {
21
22 fseek($fd, $ThisFileInfo['avdataoffset'], SEEK_SET);
23 $NSVheader = fread($fd, 4);
24
25 switch ($NSVheader) {
26 case 'NSVs':
27 if ($this->getNSVsHeaderFilepointer($fd, $ThisFileInfo, 0)) {
28 $ThisFileInfo['fileformat'] = 'nsv';
29 $ThisFileInfo['audio']['dataformat'] = 'nsv';
30 $ThisFileInfo['video']['dataformat'] = 'nsv';
31 $ThisFileInfo['audio']['lossless'] = false;
32 $ThisFileInfo['video']['lossless'] = false;
33 }
34 break;
35
36 case 'NSVf':
37 if ($this->getNSVfHeaderFilepointer($fd, $ThisFileInfo, 0)) {
38 $ThisFileInfo['fileformat'] = 'nsv';
39 $ThisFileInfo['audio']['dataformat'] = 'nsv';
40 $ThisFileInfo['video']['dataformat'] = 'nsv';
41 $ThisFileInfo['audio']['lossless'] = false;
42 $ThisFileInfo['video']['lossless'] = false;
43 $this->getNSVsHeaderFilepointer($fd, $ThisFileInfo, $ThisFileInfo['nsv']['NSVf']['header_length']);
44 }
45 break;
46
47 default:
48 $ThisFileInfo['error'][] = 'Expecting "NSVs" or "NSVf" at offset '.$ThisFileInfo['avdataoffset'].', found "'.$NSVheader.'"';
49 return false;
50 break;
51 }
52
53 if (!isset($ThisFileInfo['nsv']['NSVf'])) {
54 $ThisFileInfo['warning'][] = 'NSVf header not present - cannot calculate playtime or bitrate';
55 }
56
57 return true;
58 }
59
60 function getNSVsHeaderFilepointer(&$fd, &$ThisFileInfo, $fileoffset) {
61 fseek($fd, $fileoffset, SEEK_SET);
62 $NSVsheader = fread($fd, 28);
63 $offset = 0;
64
65 $ThisFileInfo['nsv']['NSVs']['identifier'] = substr($NSVsheader, $offset, 4);
66 $offset += 4;
67
68 if ($ThisFileInfo['nsv']['NSVs']['identifier'] != 'NSVs') {
69 $ThisFileInfo['error'][] = 'expected "NSVs" at offset ('.$fileoffset.'), found "'.$ThisFileInfo['nsv']['NSVs']['identifier'].'" instead';
70 unset($ThisFileInfo['nsv']['NSVs']);
71 return false;
72 }
73
74 $ThisFileInfo['nsv']['NSVs']['offset'] = $fileoffset;
75
76 $ThisFileInfo['nsv']['NSVs']['video_codec'] = substr($NSVsheader, $offset, 4);
77 $offset += 4;
78 $ThisFileInfo['nsv']['NSVs']['audio_codec'] = substr($NSVsheader, $offset, 4);
79 $offset += 4;
80 $ThisFileInfo['nsv']['NSVs']['resolution_x'] = getid3_lib::LittleEndian2Int(substr($NSVsheader, $offset, 2));
81 $offset += 2;
82 $ThisFileInfo['nsv']['NSVs']['resolution_y'] = getid3_lib::LittleEndian2Int(substr($NSVsheader, $offset, 2));
83 $offset += 2;
84
85 $ThisFileInfo['nsv']['NSVs']['framerate_index'] = getid3_lib::LittleEndian2Int(substr($NSVsheader, $offset, 1));
86 $offset += 1;
87 //$ThisFileInfo['nsv']['NSVs']['unknown1b'] = getid3_lib::LittleEndian2Int(substr($NSVsheader, $offset, 1));
88 $offset += 1;
89 //$ThisFileInfo['nsv']['NSVs']['unknown1c'] = getid3_lib::LittleEndian2Int(substr($NSVsheader, $offset, 1));
90 $offset += 1;
91 //$ThisFileInfo['nsv']['NSVs']['unknown1d'] = getid3_lib::LittleEndian2Int(substr($NSVsheader, $offset, 1));
92 $offset += 1;
93 //$ThisFileInfo['nsv']['NSVs']['unknown2a'] = getid3_lib::LittleEndian2Int(substr($NSVsheader, $offset, 1));
94 $offset += 1;
95 //$ThisFileInfo['nsv']['NSVs']['unknown2b'] = getid3_lib::LittleEndian2Int(substr($NSVsheader, $offset, 1));
96 $offset += 1;
97 //$ThisFileInfo['nsv']['NSVs']['unknown2c'] = getid3_lib::LittleEndian2Int(substr($NSVsheader, $offset, 1));
98 $offset += 1;
99 //$ThisFileInfo['nsv']['NSVs']['unknown2d'] = getid3_lib::LittleEndian2Int(substr($NSVsheader, $offset, 1));
100 $offset += 1;
101
102 switch ($ThisFileInfo['nsv']['NSVs']['audio_codec']) {
103 case 'PCM ':
104 $ThisFileInfo['nsv']['NSVs']['bits_channel'] = getid3_lib::LittleEndian2Int(substr($NSVsheader, $offset, 1));
105 $offset += 1;
106 $ThisFileInfo['nsv']['NSVs']['channels'] = getid3_lib::LittleEndian2Int(substr($NSVsheader, $offset, 1));
107 $offset += 1;
108 $ThisFileInfo['nsv']['NSVs']['sample_rate'] = getid3_lib::LittleEndian2Int(substr($NSVsheader, $offset, 2));
109 $offset += 2;
110
111 $ThisFileInfo['audio']['sample_rate'] = $ThisFileInfo['nsv']['NSVs']['sample_rate'];
112 break;
113
114 case 'MP3 ':
115 case 'NONE':
116 default:
117 //$ThisFileInfo['nsv']['NSVs']['unknown3'] = getid3_lib::LittleEndian2Int(substr($NSVsheader, $offset, 4));
118 $offset += 4;
119 break;
120 }
121
122 $ThisFileInfo['video']['resolution_x'] = $ThisFileInfo['nsv']['NSVs']['resolution_x'];
123 $ThisFileInfo['video']['resolution_y'] = $ThisFileInfo['nsv']['NSVs']['resolution_y'];
124 $ThisFileInfo['nsv']['NSVs']['frame_rate'] = $this->NSVframerateLookup($ThisFileInfo['nsv']['NSVs']['framerate_index']);
125 $ThisFileInfo['video']['frame_rate'] = $ThisFileInfo['nsv']['NSVs']['frame_rate'];
126 $ThisFileInfo['video']['bits_per_sample'] = 24;
127 $ThisFileInfo['video']['pixel_aspect_ratio'] = (float) 1;
128
129 return true;
130 }
131
132 function getNSVfHeaderFilepointer(&$fd, &$ThisFileInfo, $fileoffset, $getTOCoffsets=false) {
133 fseek($fd, $fileoffset, SEEK_SET);
134 $NSVfheader = fread($fd, 28);
135 $offset = 0;
136
137 $ThisFileInfo['nsv']['NSVf']['identifier'] = substr($NSVfheader, $offset, 4);
138 $offset += 4;
139
140 if ($ThisFileInfo['nsv']['NSVf']['identifier'] != 'NSVf') {
141 $ThisFileInfo['error'][] = 'expected "NSVf" at offset ('.$fileoffset.'), found "'.$ThisFileInfo['nsv']['NSVf']['identifier'].'" instead';
142 unset($ThisFileInfo['nsv']['NSVf']);
143 return false;
144 }
145
146 $ThisFileInfo['nsv']['NSVs']['offset'] = $fileoffset;
147
148 $ThisFileInfo['nsv']['NSVf']['header_length'] = getid3_lib::LittleEndian2Int(substr($NSVfheader, $offset, 4));
149 $offset += 4;
150 $ThisFileInfo['nsv']['NSVf']['file_size'] = getid3_lib::LittleEndian2Int(substr($NSVfheader, $offset, 4));
151 $offset += 4;
152
153 if ($ThisFileInfo['nsv']['NSVf']['file_size'] > $ThisFileInfo['avdataend']) {
154 $ThisFileInfo['warning'][] = 'truncated file - NSVf header indicates '.$ThisFileInfo['nsv']['NSVf']['file_size'].' bytes, file actually '.$ThisFileInfo['avdataend'].' bytes';
155 }
156
157 $ThisFileInfo['nsv']['NSVf']['playtime_ms'] = getid3_lib::LittleEndian2Int(substr($NSVfheader, $offset, 4));
158 $offset += 4;
159 $ThisFileInfo['nsv']['NSVf']['meta_size'] = getid3_lib::LittleEndian2Int(substr($NSVfheader, $offset, 4));
160 $offset += 4;
161 $ThisFileInfo['nsv']['NSVf']['TOC_entries_1'] = getid3_lib::LittleEndian2Int(substr($NSVfheader, $offset, 4));
162 $offset += 4;
163 $ThisFileInfo['nsv']['NSVf']['TOC_entries_2'] = getid3_lib::LittleEndian2Int(substr($NSVfheader, $offset, 4));
164 $offset += 4;
165
166 if ($ThisFileInfo['nsv']['NSVf']['playtime_ms'] == 0) {
167 $ThisFileInfo['error'][] = 'Corrupt NSV file: NSVf.playtime_ms == zero';
168 return false;
169 }
170
171 $NSVfheader .= fread($fd, $ThisFileInfo['nsv']['NSVf']['meta_size'] + (4 * $ThisFileInfo['nsv']['NSVf']['TOC_entries_1']) + (4 * $ThisFileInfo['nsv']['NSVf']['TOC_entries_2']));
172 $NSVfheaderlength = strlen($NSVfheader);
173 $ThisFileInfo['nsv']['NSVf']['metadata'] = substr($NSVfheader, $offset, $ThisFileInfo['nsv']['NSVf']['meta_size']);
174 $offset += $ThisFileInfo['nsv']['NSVf']['meta_size'];
175
176 if ($getTOCoffsets) {
177 $TOCcounter = 0;
178 while ($TOCcounter < $ThisFileInfo['nsv']['NSVf']['TOC_entries_1']) {
179 if ($TOCcounter < $ThisFileInfo['nsv']['NSVf']['TOC_entries_1']) {
180 $ThisFileInfo['nsv']['NSVf']['TOC_1'][$TOCcounter] = getid3_lib::LittleEndian2Int(substr($NSVfheader, $offset, 4));
181 $offset += 4;
182 $TOCcounter++;
183 }
184 }
185 }
186
187 if (trim($ThisFileInfo['nsv']['NSVf']['metadata']) != '') {
188 $ThisFileInfo['nsv']['NSVf']['metadata'] = str_replace('`', "\x01", $ThisFileInfo['nsv']['NSVf']['metadata']);
189 $CommentPairArray = explode("\x01".' ', $ThisFileInfo['nsv']['NSVf']['metadata']);
190 foreach ($CommentPairArray as $CommentPair) {
191 if (strstr($CommentPair, '='."\x01")) {
192 list($key, $value) = explode('='."\x01", $CommentPair, 2);
193 $ThisFileInfo['nsv']['comments'][strtolower($key)][] = trim(str_replace("\x01", '', $value));
194 }
195 }
196 }
197
198 $ThisFileInfo['playtime_seconds'] = $ThisFileInfo['nsv']['NSVf']['playtime_ms'] / 1000;
199 $ThisFileInfo['bitrate'] = ($ThisFileInfo['nsv']['NSVf']['file_size'] * 8) / $ThisFileInfo['playtime_seconds'];
200
201 return true;
202 }
203
204
205 function NSVframerateLookup($framerateindex) {
206 if ($framerateindex <= 127) {
207 return (float) $framerateindex;
208 }
209
210 static $NSVframerateLookup = array();
211 if (empty($NSVframerateLookup)) {
212 $NSVframerateLookup[129] = (float) 29.970;
213 $NSVframerateLookup[131] = (float) 23.976;
214 $NSVframerateLookup[133] = (float) 14.985;
215 $NSVframerateLookup[197] = (float) 59.940;
216 $NSVframerateLookup[199] = (float) 47.952;
217 }
218 return (isset($NSVframerateLookup[$framerateindex]) ? $NSVframerateLookup[$framerateindex] : false);
219 }
220
221}
222
223
224?>
getid3_handler\fseek
fseek($bytes, $whence=SEEK_SET)
Definition: getid3.php:1697
getid3_handler\fread
fread($bytes)
Definition: getid3.php:1685
getid3_lib\LittleEndian2Int
LittleEndian2Int($byteword, $signed=false)
Definition: getid3.lib.php:266
getid3_nsv
getID3() by James Heinrich info@getid3.org //
Definition: module.audio-video.nsv.php:18
getid3_nsv\getid3_nsv
getid3_nsv(&$fd, &$ThisFileInfo)
Definition: module.audio-video.nsv.php:20
getid3_nsv\getNSVfHeaderFilepointer
getNSVfHeaderFilepointer(&$fd, &$ThisFileInfo, $fileoffset, $getTOCoffsets=false)
Definition: module.audio-video.nsv.php:132
getid3_nsv\getNSVsHeaderFilepointer
getNSVsHeaderFilepointer(&$fd, &$ThisFileInfo, $fileoffset)
Definition: module.audio-video.nsv.php:60
getid3_nsv\NSVframerateLookup
NSVframerateLookup($framerateindex)
Definition: module.audio-video.nsv.php:205