ILIAS  eassessment Revision 61809
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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 
17 class 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 ?>