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module.audio.optimfrog.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.optimfrog.php //
11 // module for analyzing OptimFROG audio files //
12 // dependencies: module.audio.riff.php //
13 // ///
15 
16 getid3_lib::IncludeDependency(GETID3_INCLUDEPATH.'module.audio-video.riff.php', __FILE__, true);
17 
18 class getid3_optimfrog
19 {
20 
21  function getid3_optimfrog(&$fd, &$ThisFileInfo) {
22  $ThisFileInfo['fileformat'] = 'ofr';
23  $ThisFileInfo['audio']['dataformat'] = 'ofr';
24  $ThisFileInfo['audio']['bitrate_mode'] = 'vbr';
25  $ThisFileInfo['audio']['lossless'] = true;
26 
27  fseek($fd, $ThisFileInfo['avdataoffset'], SEEK_SET);
28  $OFRheader = fread($fd, 8);
29  if (substr($OFRheader, 0, 5) == '*RIFF') {
30 
31  return $this->ParseOptimFROGheader42($fd, $ThisFileInfo);
32 
33  } elseif (substr($OFRheader, 0, 3) == 'OFR') {
34 
35  return $this->ParseOptimFROGheader45($fd, $ThisFileInfo);
36 
37  }
38 
39  $ThisFileInfo['error'][] = 'Expecting "*RIFF" or "OFR " at offset '.$ThisFileInfo['avdataoffset'].', found "'.$OFRheader.'"';
40  unset($ThisFileInfo['fileformat']);
41  return false;
42  }
43 
44 
45  function ParseOptimFROGheader42(&$fd, &$ThisFileInfo) {
46  // for fileformat of v4.21 and older
47 
48  fseek($fd, $ThisFileInfo['avdataoffset'], SEEK_SET);
49  $OptimFROGheaderData = fread($fd, 45);
50  $ThisFileInfo['avdataoffset'] = 45;
51 
52  $OptimFROGencoderVersion_raw = getid3_lib::LittleEndian2Int(substr($OptimFROGheaderData, 0, 1));
53  $OptimFROGencoderVersion_major = floor($OptimFROGencoderVersion_raw / 10);
54  $OptimFROGencoderVersion_minor = $OptimFROGencoderVersion_raw - ($OptimFROGencoderVersion_major * 10);
55  $RIFFdata = substr($OptimFROGheaderData, 1, 44);
56  $OrignalRIFFheaderSize = getid3_lib::LittleEndian2Int(substr($RIFFdata, 4, 4)) + 8;
57  $OrignalRIFFdataSize = getid3_lib::LittleEndian2Int(substr($RIFFdata, 40, 4)) + 44;
58 
59  if ($OrignalRIFFheaderSize > $OrignalRIFFdataSize) {
60  $ThisFileInfo['avdataend'] -= ($OrignalRIFFheaderSize - $OrignalRIFFdataSize);
61  fseek($fd, $ThisFileInfo['avdataend'], SEEK_SET);
62  $RIFFdata .= fread($fd, $OrignalRIFFheaderSize - $OrignalRIFFdataSize);
63  }
64 
65  // move the data chunk after all other chunks (if any)
66  // so that the RIFF parser doesn't see EOF when trying
67  // to skip over the data chunk
68  $RIFFdata = substr($RIFFdata, 0, 36).substr($RIFFdata, 44).substr($RIFFdata, 36, 8);
69  getid3_riff::ParseRIFFdata($RIFFdata, $ThisFileInfo);
70 
71  $ThisFileInfo['audio']['encoder'] = 'OptimFROG '.$OptimFROGencoderVersion_major.'.'.$OptimFROGencoderVersion_minor;
72  $ThisFileInfo['audio']['channels'] = $ThisFileInfo['riff']['audio'][0]['channels'];
73  $ThisFileInfo['audio']['sample_rate'] = $ThisFileInfo['riff']['audio'][0]['sample_rate'];
74  $ThisFileInfo['audio']['bits_per_sample'] = $ThisFileInfo['riff']['audio'][0]['bits_per_sample'];
75  $ThisFileInfo['playtime_seconds'] = $OrignalRIFFdataSize / ($ThisFileInfo['audio']['channels'] * $ThisFileInfo['audio']['sample_rate'] * ($ThisFileInfo['audio']['bits_per_sample'] / 8));
76  $ThisFileInfo['audio']['bitrate'] = (($ThisFileInfo['avdataend'] - $ThisFileInfo['avdataoffset']) * 8) / $ThisFileInfo['playtime_seconds'];
77 
78  return true;
79  }
80 
81 
82  function ParseOptimFROGheader45(&$fd, &$ThisFileInfo) {
83  // for fileformat of v4.50a and higher
84 
85  $RIFFdata = '';
86  fseek($fd, $ThisFileInfo['avdataoffset'], SEEK_SET);
87  while (!feof($fd) && (ftell($fd) < $ThisFileInfo['avdataend'])) {
88  $BlockOffset = ftell($fd);
89  $BlockData = fread($fd, 8);
90  $offset = 8;
91  $BlockName = substr($BlockData, 0, 4);
92  $BlockSize = getid3_lib::LittleEndian2Int(substr($BlockData, 4, 4));
93 
94  if ($BlockName == 'OFRX') {
95  $BlockName = 'OFR ';
96  }
97  if (!isset($ThisFileInfo['ofr'][$BlockName])) {
98  $ThisFileInfo['ofr'][$BlockName] = array();
99  }
100  $thisfile_ofr_thisblock = &$ThisFileInfo['ofr'][$BlockName];
101 
102  switch ($BlockName) {
103  case 'OFR ':
104 
105  // shortcut
106  $thisfile_ofr_thisblock['offset'] = $BlockOffset;
107  $thisfile_ofr_thisblock['size'] = $BlockSize;
108 
109  $ThisFileInfo['audio']['encoder'] = 'OptimFROG 4.50 alpha';
110  switch ($BlockSize) {
111  case 12:
112  case 15:
113  // good
114  break;
115 
116  default:
117  $ThisFileInfo['warning'][] = '"'.$BlockName.'" contains more data than expected (expected 12 or 15 bytes, found '.$BlockSize.' bytes)';
118  break;
119  }
120  $BlockData .= fread($fd, $BlockSize);
121 
122  $thisfile_ofr_thisblock['total_samples'] = getid3_lib::LittleEndian2Int(substr($BlockData, $offset, 6));
123  $offset += 6;
124  $thisfile_ofr_thisblock['raw']['sample_type'] = getid3_lib::LittleEndian2Int(substr($BlockData, $offset, 1));
125  $thisfile_ofr_thisblock['sample_type'] = $this->OptimFROGsampleTypeLookup($thisfile_ofr_thisblock['raw']['sample_type']);
126  $offset += 1;
127  $thisfile_ofr_thisblock['channel_config'] = getid3_lib::LittleEndian2Int(substr($BlockData, $offset, 1));
128  $thisfile_ofr_thisblock['channels'] = $thisfile_ofr_thisblock['channel_config'];
129  $offset += 1;
130  $thisfile_ofr_thisblock['sample_rate'] = getid3_lib::LittleEndian2Int(substr($BlockData, $offset, 4));
131  $offset += 4;
132 
133  if ($BlockSize > 12) {
134 
135  // OFR 4.504b or higher
136  $thisfile_ofr_thisblock['channels'] = $this->OptimFROGchannelConfigNumChannelsLookup($thisfile_ofr_thisblock['channel_config']);
137  $thisfile_ofr_thisblock['raw']['encoder_id'] = getid3_lib::LittleEndian2Int(substr($BlockData, $offset, 2));
138  $thisfile_ofr_thisblock['encoder'] = $this->OptimFROGencoderNameLookup($thisfile_ofr_thisblock['raw']['encoder_id']);
139  $offset += 2;
140  $thisfile_ofr_thisblock['raw']['compression'] = getid3_lib::LittleEndian2Int(substr($BlockData, $offset, 1));
141  $thisfile_ofr_thisblock['compression'] = $this->OptimFROGcompressionLookup($thisfile_ofr_thisblock['raw']['compression']);
142  $thisfile_ofr_thisblock['speedup'] = $this->OptimFROGspeedupLookup($thisfile_ofr_thisblock['raw']['compression']);
143  $offset += 1;
144 
145  $ThisFileInfo['audio']['encoder'] = 'OptimFROG '.$thisfile_ofr_thisblock['encoder'];
146  $ThisFileInfo['audio']['encoder_options'] = '--mode '.$thisfile_ofr_thisblock['compression'];
147 
148  if ((($thisfile_ofr_thisblock['raw']['encoder_id'] & 0xF0) >> 4) == 7) { // v4.507
149  if (strtolower(getid3_lib::fileextension($ThisFileInfo['filename'])) == 'ofs') {
150  // OptimFROG DualStream format is lossy, but as of v4.507 there is no way to tell the difference
151  // between lossless and lossy other than the file extension.
152  $ThisFileInfo['audio']['dataformat'] = 'ofs';
153  $ThisFileInfo['audio']['lossless'] = true;
154  }
155  }
156 
157  }
158 
159  $ThisFileInfo['audio']['channels'] = $thisfile_ofr_thisblock['channels'];
160  $ThisFileInfo['audio']['sample_rate'] = $thisfile_ofr_thisblock['sample_rate'];
161  $ThisFileInfo['audio']['bits_per_sample'] = $this->OptimFROGbitsPerSampleTypeLookup($thisfile_ofr_thisblock['raw']['sample_type']);
162  break;
163 
164 
165  case 'COMP':
166  // unlike other block types, there CAN be multiple COMP blocks
167 
168  $COMPdata['offset'] = $BlockOffset;
169  $COMPdata['size'] = $BlockSize;
170 
171  if ($ThisFileInfo['avdataoffset'] == 0) {
172  $ThisFileInfo['avdataoffset'] = $BlockOffset;
173  }
174 
175  // Only interested in first 14 bytes (only first 12 needed for v4.50 alpha), not actual audio data
176  $BlockData .= fread($fd, 14);
177  fseek($fd, $BlockSize - 14, SEEK_CUR);
178 
179  $COMPdata['crc_32'] = getid3_lib::LittleEndian2Int(substr($BlockData, $offset, 4));
180  $offset += 4;
181  $COMPdata['sample_count'] = getid3_lib::LittleEndian2Int(substr($BlockData, $offset, 4));
182  $offset += 4;
183  $COMPdata['raw']['sample_type'] = getid3_lib::LittleEndian2Int(substr($BlockData, $offset, 1));
184  $COMPdata['sample_type'] = $this->OptimFROGsampleTypeLookup($COMPdata['raw']['sample_type']);
185  $offset += 1;
186  $COMPdata['raw']['channel_configuration'] = getid3_lib::LittleEndian2Int(substr($BlockData, $offset, 1));
187  $COMPdata['channel_configuration'] = $this->OptimFROGchannelConfigurationLookup($COMPdata['raw']['channel_configuration']);
188  $offset += 1;
189  $COMPdata['raw']['algorithm_id'] = getid3_lib::LittleEndian2Int(substr($BlockData, $offset, 2));
190  //$COMPdata['algorithm'] = OptimFROGalgorithmNameLookup($COMPdata['raw']['algorithm_id']);
191  $offset += 2;
192 
193  if ($ThisFileInfo['ofr']['OFR ']['size'] > 12) {
194 
195  // OFR 4.504b or higher
196  $COMPdata['raw']['encoder_id'] = getid3_lib::LittleEndian2Int(substr($BlockData, $offset, 2));
197  $COMPdata['encoder'] = $this->OptimFROGencoderNameLookup($COMPdata['raw']['encoder_id']);
198  $offset += 2;
199 
200  }
201 
202  if ($COMPdata['crc_32'] == 0x454E4F4E) {
203  // ASCII value of 'NONE' - placeholder value in v4.50a
204  $COMPdata['crc_32'] = false;
205  }
206 
207  $thisfile_ofr_thisblock[] = $COMPdata;
208  break;
209 
210  case 'HEAD':
211  $thisfile_ofr_thisblock['offset'] = $BlockOffset;
212  $thisfile_ofr_thisblock['size'] = $BlockSize;
213 
214  $RIFFdata .= fread($fd, $BlockSize);
215  break;
216 
217  case 'TAIL':
218  $thisfile_ofr_thisblock['offset'] = $BlockOffset;
219  $thisfile_ofr_thisblock['size'] = $BlockSize;
220 
221  if ($BlockSize > 0) {
222  $RIFFdata .= fread($fd, $BlockSize);
223  }
224  break;
225 
226  case 'RECV':
227  // block contains no useful meta data - simply note and skip
228 
229  $thisfile_ofr_thisblock['offset'] = $BlockOffset;
230  $thisfile_ofr_thisblock['size'] = $BlockSize;
231 
232  fseek($fd, $BlockSize, SEEK_CUR);
233  break;
234 
235 
236  case 'APET':
237  // APEtag v2
238 
239  $thisfile_ofr_thisblock['offset'] = $BlockOffset;
240  $thisfile_ofr_thisblock['size'] = $BlockSize;
241  $ThisFileInfo['warning'][] = 'APEtag processing inside OptimFROG not supported in this version ('.GETID3_VERSION.') of getID3()';
242 
243  fseek($fd, $BlockSize, SEEK_CUR);
244  break;
245 
246 
247  case 'MD5 ':
248  // APEtag v2
249 
250  $thisfile_ofr_thisblock['offset'] = $BlockOffset;
251  $thisfile_ofr_thisblock['size'] = $BlockSize;
252 
253  if ($BlockSize == 16) {
254 
255  $thisfile_ofr_thisblock['md5_binary'] = fread($fd, $BlockSize);
256  $thisfile_ofr_thisblock['md5_string'] = getid3_lib::PrintHexBytes($thisfile_ofr_thisblock['md5_binary'], true, false, false);
257  $ThisFileInfo['md5_data_source'] = $thisfile_ofr_thisblock['md5_string'];
258 
259  } else {
260 
261  $ThisFileInfo['warning'][] = 'Expecting block size of 16 in "MD5 " chunk, found '.$BlockSize.' instead';
262  fseek($fd, $BlockSize, SEEK_CUR);
263 
264  }
265  break;
266 
267 
268  default:
269  $thisfile_ofr_thisblock['offset'] = $BlockOffset;
270  $thisfile_ofr_thisblock['size'] = $BlockSize;
271 
272  $ThisFileInfo['warning'][] = 'Unhandled OptimFROG block type "'.$BlockName.'" at offset '.$thisfile_ofr_thisblock['offset'];
273  fseek($fd, $BlockSize, SEEK_CUR);
274  break;
275  }
276  }
277  if (isset($ThisFileInfo['ofr']['TAIL']['offset'])) {
278  $ThisFileInfo['avdataend'] = $ThisFileInfo['ofr']['TAIL']['offset'];
279  }
280 
281  $ThisFileInfo['playtime_seconds'] = (float) $ThisFileInfo['ofr']['OFR ']['total_samples'] / ($ThisFileInfo['audio']['channels'] * $ThisFileInfo['audio']['sample_rate']);
282  $ThisFileInfo['audio']['bitrate'] = (($ThisFileInfo['avdataend'] - $ThisFileInfo['avdataoffset']) * 8) / $ThisFileInfo['playtime_seconds'];
283 
284  // move the data chunk after all other chunks (if any)
285  // so that the RIFF parser doesn't see EOF when trying
286  // to skip over the data chunk
287  $RIFFdata = substr($RIFFdata, 0, 36).substr($RIFFdata, 44).substr($RIFFdata, 36, 8);
288  getid3_riff::ParseRIFFdata($RIFFdata, $ThisFileInfo);
289 
290  return true;
291  }
292 
293 
294  function OptimFROGsampleTypeLookup($SampleType) {
295  static $OptimFROGsampleTypeLookup = array(
296  0 => 'unsigned int (8-bit)',
297  1 => 'signed int (8-bit)',
298  2 => 'unsigned int (16-bit)',
299  3 => 'signed int (16-bit)',
300  4 => 'unsigned int (24-bit)',
301  5 => 'signed int (24-bit)',
302  6 => 'unsigned int (32-bit)',
303  7 => 'signed int (32-bit)',
304  8 => 'float 0.24 (32-bit)',
305  9 => 'float 16.8 (32-bit)',
306  10 => 'float 24.0 (32-bit)'
307  );
308  return (isset($OptimFROGsampleTypeLookup[$SampleType]) ? $OptimFROGsampleTypeLookup[$SampleType] : false);
309  }
310 
311  function OptimFROGbitsPerSampleTypeLookup($SampleType) {
312  static $OptimFROGbitsPerSampleTypeLookup = array(
313  0 => 8,
314  1 => 8,
315  2 => 16,
316  3 => 16,
317  4 => 24,
318  5 => 24,
319  6 => 32,
320  7 => 32,
321  8 => 32,
322  9 => 32,
323  10 => 32
324  );
325  return (isset($OptimFROGbitsPerSampleTypeLookup[$SampleType]) ? $OptimFROGbitsPerSampleTypeLookup[$SampleType] : false);
326  }
327 
328  function OptimFROGchannelConfigurationLookup($ChannelConfiguration) {
329  static $OptimFROGchannelConfigurationLookup = array(
330  0 => 'mono',
331  1 => 'stereo'
332  );
333  return (isset($OptimFROGchannelConfigurationLookup[$ChannelConfiguration]) ? $OptimFROGchannelConfigurationLookup[$ChannelConfiguration] : false);
334  }
335 
336  function OptimFROGchannelConfigNumChannelsLookup($ChannelConfiguration) {
337  static $OptimFROGchannelConfigNumChannelsLookup = array(
338  0 => 1,
339  1 => 2
340  );
341  return (isset($OptimFROGchannelConfigNumChannelsLookup[$ChannelConfiguration]) ? $OptimFROGchannelConfigNumChannelsLookup[$ChannelConfiguration] : false);
342  }
343 
344 
345 
346  // function OptimFROGalgorithmNameLookup($AlgorithID) {
347  // static $OptimFROGalgorithmNameLookup = array();
348  // return (isset($OptimFROGalgorithmNameLookup[$AlgorithID]) ? $OptimFROGalgorithmNameLookup[$AlgorithID] : false);
349  // }
350 
351 
352  function OptimFROGencoderNameLookup($EncoderID) {
353  // version = (encoderID >> 4) + 4500
354  // system = encoderID & 0xF
355 
356  $EncoderVersion = number_format(((($EncoderID & 0xF0) >> 4) + 4500) / 1000, 3);
357  $EncoderSystemID = ($EncoderID & 0x0F);
358 
359  static $OptimFROGencoderSystemLookup = array(
360  0x00 => 'Windows console',
361  0x01 => 'Linux console',
362  0x0F => 'unknown'
363  );
364  return $EncoderVersion.' ('.(isset($OptimFROGencoderSystemLookup[$EncoderSystemID]) ? $OptimFROGencoderSystemLookup[$EncoderSystemID] : 'undefined encoder type (0x'.dechex($EncoderSystemID).')').')';
365  }
366 
367  function OptimFROGcompressionLookup($CompressionID) {
368  // mode = compression >> 3
369  // speedup = compression & 0x07
370 
371  $CompressionModeID = ($CompressionID & 0xF8) >> 3;
372  //$CompressionSpeedupID = ($CompressionID & 0x07);
373 
374  static $OptimFROGencoderModeLookup = array(
375  0x00 => 'fast',
376  0x01 => 'normal',
377  0x02 => 'high',
378  0x03 => 'extra', // extranew (some versions)
379  0x04 => 'best', // bestnew (some versions)
380  0x05 => 'ultra',
381  0x06 => 'insane',
382  0x07 => 'highnew',
383  0x08 => 'extranew',
384  0x09 => 'bestnew'
385  );
386  return (isset($OptimFROGencoderModeLookup[$CompressionModeID]) ? $OptimFROGencoderModeLookup[$CompressionModeID] : 'undefined mode (0x'.str_pad(dechex($CompressionModeID), 2, '0', STR_PAD_LEFT).')');
387  }
388 
389  function OptimFROGspeedupLookup($CompressionID) {
390  // mode = compression >> 3
391  // speedup = compression & 0x07
392 
393  //$CompressionModeID = ($CompressionID & 0xF8) >> 3;
394  $CompressionSpeedupID = ($CompressionID & 0x07);
395 
396  static $OptimFROGencoderSpeedupLookup = array(
397  0x00 => '1x',
398  0x01 => '2x',
399  0x02 => '4x'
400  );
401 
402  return (isset($OptimFROGencoderSpeedupLookup[$CompressionSpeedupID]) ? $OptimFROGencoderSpeedupLookup[$CompressionSpeedupID] : 'undefined mode (0x'.dechex($CompressionSpeedupID));
403  }
404 
405 }
406 
407 
408 ?>