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/public/library/xinha/plugins/MootoolsFileManager/mootools-filemanager/Backend/Assets/getid3/module.audio.mp3.php

https://bitbucket.org/mayorbrain/precurio-v2
PHP | 1696 lines | 1168 code | 347 blank | 181 comment | 327 complexity | 3d6c9200771812319016ccfa9a9602c9 MD5 | raw file
Possible License(s): MPL-2.0-no-copyleft-exception, LGPL-2.1, BSD-3-Clause, LGPL-2.0, CC-BY-SA-3.0, MIT

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  1. <?php

    2. 

  2. // +----------------------------------------------------------------------+

    3. 

  3. // | PHP version 5                                                        |

    4. 

  4. // +----------------------------------------------------------------------+

    5. 

  5. // | Copyright (c) 2002-2006 James Heinrich, Allan Hansen                 |

    6. 

  6. // +----------------------------------------------------------------------+

    7. 

  7. // | This source file is subject to version 2 of the GPL license,         |

    8. 

  8. // | that is bundled with this package in the file license.txt and is     |

    9. 

  9. // | available through the world-wide-web at the following url:           |

    10. 

  10. // | http://www.gnu.org/copyleft/gpl.html                                 |

    11. 

  11. // +----------------------------------------------------------------------+

    12. 

  12. // | getID3() - http://getid3.sourceforge.net or http://www.getid3.org    |

    13. 

  13. // +----------------------------------------------------------------------+

    14. 

  14. // | Authors: James Heinrich <infoŘgetid3*org>                            |

    15. 

  15. // |          Allan Hansen <ahŘartemis*dk>                                |

    16. 

  16. // +----------------------------------------------------------------------+

    17. 

  17. // | module.audio.mp3.php                                                 |

    18. 

  18. // | Module for analyzing MPEG Audio Layer 1,2,3 files.                   |

    19. 

  19. // | dependencies: none                                                   |

    20. 

  20. // +----------------------------------------------------------------------+

    21. 

  21. //

    22. 

  22. // $Id: module.audio.mp3.php,v 1.10 2006/11/16 22:57:57 ah Exp $

    23. 

  23. 

    24. 

  24. 

    25. 

  25. 

    26. 

  26. class getid3_mp3 extends getid3_handler

    27. 

  27. {

    28. 

  28.     // Number of frames to scan to determine if MPEG-audio sequence is valid.

    29. 

  29.     // Lower this number to 5-20 for faster scanning

    30. 

  30.     // Increase this number to 50+ for most accurate detection of valid VBR/CBR mpeg-audio streams

    31. 

  31.     const VALID_CHECK_FRAMES = 35;

    32. 

  32.     

    33. 

  33. 

    34. 

  34.     public function Analyze() {

    35. 

  35. 

    36. 

  36.         $this->getAllMPEGInfo($this->getid3->fp, $this->getid3->info);

    37. 

  37. 

    38. 

  38.         return true;   

    39. 

  39.     }

    40. 

  40.     

    41. 

  41.     

    42. 

  42.     public function AnalyzeMPEGaudioInfo() {

    43. 

  43.         

    44. 

  44.         $this->getOnlyMPEGaudioInfo($this->getid3->fp, $this->getid3->info, $this->getid3->info['avdataoffset'], false);

    45. 

  45.     }

    46. 

  46. 

    47. 

  47. 

    48. 

  48.     public function getAllMPEGInfo(&$fd, &$info) {

    49. 

  49. 

    50. 

  50.         $this->getOnlyMPEGaudioInfo($fd, $info, 0 + $info['avdataoffset']);

    51. 

  51. 

    52. 

  52.         if (isset($info['mpeg']['audio']['bitrate_mode'])) {

    53. 

  53.             $info['audio']['bitrate_mode'] = strtolower($info['mpeg']['audio']['bitrate_mode']);

    54. 

  54.         }

    55. 

  55. 

    56. 

  56.         if (((isset($info['id3v2']['headerlength']) && ($info['avdataoffset'] > $info['id3v2']['headerlength'])) || (!isset($info['id3v2']) && ($info['avdataoffset'] > 0)))) {

    57. 

  57. 

    58. 

  58.             $synch_offset_warning = 'Unknown data before synch ';

    59. 

  59.             if (isset($info['id3v2']['headerlength'])) {

    60. 

  60.                 $synch_offset_warning .= '(ID3v2 header ends at '.$info['id3v2']['headerlength'].', then '.($info['avdataoffset'] - $info['id3v2']['headerlength']).' bytes garbage, ';

    61. 

  61.             } else {

    62. 

  62.                 $synch_offset_warning .= '(should be at beginning of file, ';

    63. 

  63.             }

    64. 

  64.             $synch_offset_warning .= 'synch detected at '.$info['avdataoffset'].')';

    65. 

  65.             if ($info['audio']['bitrate_mode'] == 'cbr') {

    66. 

  66. 

    67. 

  67.                 if (!empty($info['id3v2']['headerlength']) && (($info['avdataoffset'] - $info['id3v2']['headerlength']) == $info['mpeg']['audio']['framelength'])) {

    68. 

  68. 

    69. 

  69.                     $synch_offset_warning .= '. This is a known problem with some versions of LAME (3.90-3.92) DLL in CBR mode.';

    70. 

  70.                     $info['audio']['codec'] = 'LAME';

    71. 

  71.                     $current_data_lame_version_string = 'LAME3.';

    72. 

  72. 

    73. 

  73.                 } elseif (empty($info['id3v2']['headerlength']) && ($info['avdataoffset'] == $info['mpeg']['audio']['framelength'])) {

    74. 

  74. 

    75. 

  75.                     $synch_offset_warning .= '. This is a known problem with some versions of LAME (3.90 - 3.92) DLL in CBR mode.';

    76. 

  76.                     $info['audio']['codec'] = 'LAME';

    77. 

  77.                     $current_data_lame_version_string = 'LAME3.';

    78. 

  78. 

    79. 

  79.                 }

    80. 

  80. 

    81. 

  81.             }

    82. 

  82.             $this->getid3->warning($synch_offset_warning);

    83. 

  83. 

    84. 

  84.         }

    85. 

  85. 

    86. 

  86.         if (isset($info['mpeg']['audio']['LAME'])) {

    87. 

  87.             $info['audio']['codec'] = 'LAME';

    88. 

  88.             if (!empty($info['mpeg']['audio']['LAME']['long_version'])) {

    89. 

  89.                 $info['audio']['encoder'] = rtrim($info['mpeg']['audio']['LAME']['long_version'], "\x00");

    90. 

  90.             } elseif (!empty($info['mpeg']['audio']['LAME']['short_version'])) {

    91. 

  91.                 $info['audio']['encoder'] = rtrim($info['mpeg']['audio']['LAME']['short_version'], "\x00");

    92. 

  92.             }

    93. 

  93.         }

    94. 

  94. 

    95. 

  95.         $current_data_lame_version_string = (!empty($current_data_lame_version_string) ? $current_data_lame_version_string : @$info['audio']['encoder']);

    96. 

  96.         if (!empty($current_data_lame_version_string) && (substr($current_data_lame_version_string, 0, 6) == 'LAME3.') && !preg_match('[0-9\)]', substr($current_data_lame_version_string, -1))) {

    97. 

  97.             // a version number of LAME that does not end with a number like "LAME3.92"

    98. 

  98.             // or with a closing parenthesis like "LAME3.88 (alpha)"

    99. 

  99.             // or a version of LAME with the LAMEtag-not-filled-in-DLL-mode bug (3.90-3.92)

    100. 

  100. 

    101. 

  101.             // not sure what the actual last frame length will be, but will be less than or equal to 1441

    102. 

  102.             $possibly_longer_lame_version_frame_length = 1441;

    103. 

  103. 

    104. 

  104.             // Not sure what version of LAME this is - look in padding of last frame for longer version string

    105. 

  105.             $possible_lame_version_string_offset = $info['avdataend'] - $possibly_longer_lame_version_frame_length;

    106. 

  106.             fseek($fd, $possible_lame_version_string_offset);

    107. 

  107.             $possibly_longer_lame_version_data = fread($fd, $possibly_longer_lame_version_frame_length);

    108. 

  108.             switch (substr($current_data_lame_version_string, -1)) {

    109. 

  109.                 case 'a':

    110. 

  110.                 case 'b':

    111. 

  111.                     // "LAME3.94a" will have a longer version string of "LAME3.94 (alpha)" for example

    112. 

  112.                     // need to trim off "a" to match longer string

    113. 

  113.                     $current_data_lame_version_string = substr($current_data_lame_version_string, 0, -1);

    114. 

  114.                     break;

    115. 

  115.             }

    116. 

  116.             if (($possibly_longer_lame_version_string = strstr($possibly_longer_lame_version_data, $current_data_lame_version_string)) !== false) {

    117. 

  117.                 if (substr($possibly_longer_lame_version_string, 0, strlen($current_data_lame_version_string)) == $current_data_lame_version_string) {

    118. 

  118.                     $possibly_longer_lame_version_new_string = substr($possibly_longer_lame_version_string, 0, strspn($possibly_longer_lame_version_string, 'LAME0123456789., (abcdefghijklmnopqrstuvwxyzJFSOND)')); //"LAME3.90.3"  "LAME3.87 (beta 1, Sep 27 2000)" "LAME3.88 (beta)"

    119. 

  119.                     if (strlen($possibly_longer_lame_version_new_string) > strlen(@$info['audio']['encoder'])) {

    120. 

  120.                         $info['audio']['encoder'] = $possibly_longer_lame_version_new_string;

    121. 

  121.                     }

    122. 

  122.                 }

    123. 

  123.             }

    124. 

  124.         }

    125. 

  125.         if (!empty($info['audio']['encoder'])) {

    126. 

  126.             $info['audio']['encoder'] = rtrim($info['audio']['encoder'], "\x00 ");

    127. 

  127.         }

    128. 

  128. 

    129. 

  129.         switch (@$info['mpeg']['audio']['layer']) {

    130. 

  130.             case 1:

    131. 

  131.             case 2:

    132. 

  132.                 $info['audio']['dataformat'] = 'mp'.$info['mpeg']['audio']['layer'];

    133. 

  133.                 break;

    134. 

  134.         }

    135. 

  135.         if (@$info['fileformat'] == 'mp3') {

    136. 

  136.             switch ($info['audio']['dataformat']) {

    137. 

  137.                 case 'mp1':

    138. 

  138.                 case 'mp2':

    139. 

  139.                 case 'mp3':

    140. 

  140.                     $info['fileformat'] = $info['audio']['dataformat'];

    141. 

  141.                     break;

    142. 

  142. 

    143. 

  143.                 default:

    144. 

  144.                     $this->getid3->warning('Expecting [audio][dataformat] to be mp1/mp2/mp3 when fileformat == mp3, [audio][dataformat] actually "'.$info['audio']['dataformat'].'"');

    145. 

  145.                     break;

    146. 

  146.             }

    147. 

  147.         }

    148. 

  148.         

    149. 

  149.         $info['mime_type']         = 'audio/mpeg';

    150. 

  150.         $info['audio']['lossless'] = false;

    151. 

  151. 

    152. 

  152.         // Calculate playtime

    153. 

  153.         if (!isset($info['playtime_seconds']) && isset($info['audio']['bitrate']) && ($info['audio']['bitrate'] > 0)) {

    154. 

  154.             $info['playtime_seconds'] = ($info['avdataend'] - $info['avdataoffset']) * 8 / $info['audio']['bitrate'];

    155. 

  155.         }

    156. 

  156. 

    157. 

  157.         $info['audio']['encoder_options'] = getid3_mp3::GuessEncoderOptions($info);

    158. 

  158. 

    159. 

  159.         return true;

    160. 

  160.     }

    161. 

  161. 

    162. 

  162. 

    163. 

  163. 

    164. 

  164.     public static function GuessEncoderOptions(&$info) {

    165. 

  165.         // shortcuts

    166. 

  166.         if (!empty($info['mpeg']['audio'])) {

    167. 

  167.             $thisfile_mpeg_audio = &$info['mpeg']['audio'];

    168. 

  168.             if (!empty($thisfile_mpeg_audio['LAME'])) {

    169. 

  169.                 $thisfile_mpeg_audio_lame = &$thisfile_mpeg_audio['LAME'];

    170. 

  170.             }

    171. 

  171.         }

    172. 

  172. 

    173. 

  173.         $encoder_options = '';

    174. 

  174.         static $named_preset_bitrates = array (16, 24, 40, 56, 112, 128, 160, 192, 256);

    175. 

  175. 

    176. 

  176.         if ((@$thisfile_mpeg_audio['VBR_method'] == 'Fraunhofer') && !empty($thisfile_mpeg_audio['VBR_quality'])) {

    177. 

  177. 

    178. 

  178.             $encoder_options = 'VBR q'.$thisfile_mpeg_audio['VBR_quality'];

    179. 

  179. 

    180. 

  180.         } elseif (!empty($thisfile_mpeg_audio_lame['preset_used']) && (!in_array($thisfile_mpeg_audio_lame['preset_used_id'], $named_preset_bitrates))) {

    181. 

  181. 

    182. 

  182.             $encoder_options = $thisfile_mpeg_audio_lame['preset_used'];

    183. 

  183. 

    184. 

  184.         } elseif (!empty($thisfile_mpeg_audio_lame['vbr_quality'])) {

    185. 

  185. 

    186. 

  186.             static $known_encoder_values = array ();

    187. 

  187.             if (empty($known_encoder_values)) {

    188. 

  188. 

    189. 

  189.                 //$known_encoder_values[abrbitrate_minbitrate][vbr_quality][raw_vbr_method][raw_noise_shaping][raw_stereo_mode][ath_type][lowpass_frequency] = 'preset name';

    190. 

  190.                 $known_encoder_values[0xFF][58][1][1][3][2][20500] = '--alt-preset insane';        // 3.90,   3.90.1, 3.92

    191. 

  191.                 $known_encoder_values[0xFF][58][1][1][3][2][20600] = '--alt-preset insane';        // 3.90.2, 3.90.3, 3.91

    192. 

  192.                 $known_encoder_values[0xFF][57][1][1][3][4][20500] = '--alt-preset insane';        // 3.94,   3.95

    193. 

  193.                 $known_encoder_values['**'][78][3][2][3][2][19500] = '--alt-preset extreme';       // 3.90,   3.90.1, 3.92

    194. 

  194.                 $known_encoder_values['**'][78][3][2][3][2][19600] = '--alt-preset extreme';       // 3.90.2, 3.91

    195. 

  195.                 $known_encoder_values['**'][78][3][1][3][2][19600] = '--alt-preset extreme';       // 3.90.3

    196. 

  196.                 $known_encoder_values['**'][78][4][2][3][2][19500] = '--alt-preset fast extreme';  // 3.90,   3.90.1, 3.92

    197. 

  197.                 $known_encoder_values['**'][78][4][2][3][2][19600] = '--alt-preset fast extreme';  // 3.90.2, 3.90.3, 3.91

    198. 

  198.                 $known_encoder_values['**'][78][3][2][3][4][19000] = '--alt-preset standard';      // 3.90,   3.90.1, 3.90.2, 3.91, 3.92

    199. 

  199.                 $known_encoder_values['**'][78][3][1][3][4][19000] = '--alt-preset standard';      // 3.90.3

    200. 

  200.                 $known_encoder_values['**'][78][4][2][3][4][19000] = '--alt-preset fast standard'; // 3.90,   3.90.1, 3.90.2, 3.91, 3.92

    201. 

  201.                 $known_encoder_values['**'][78][4][1][3][4][19000] = '--alt-preset fast standard'; // 3.90.3

    202. 

  202.                 $known_encoder_values['**'][88][4][1][3][3][19500] = '--r3mix';                    // 3.90,   3.90.1, 3.92

    203. 

  203.                 $known_encoder_values['**'][88][4][1][3][3][19600] = '--r3mix';                    // 3.90.2, 3.90.3, 3.91

    204. 

  204.                 $known_encoder_values['**'][67][4][1][3][4][18000] = '--r3mix';                    // 3.94,   3.95

    205. 

  205.                 $known_encoder_values['**'][68][3][2][3][4][18000] = '--alt-preset medium';        // 3.90.3

    206. 

  206.                 $known_encoder_values['**'][68][4][2][3][4][18000] = '--alt-preset fast medium';   // 3.90.3

    207. 

  207. 

    208. 

  208.                 $known_encoder_values[0xFF][99][1][1][1][2][0]     = '--preset studio';            // 3.90,   3.90.1, 3.90.2, 3.91, 3.92

    209. 

  209.                 $known_encoder_values[0xFF][58][2][1][3][2][20600] = '--preset studio';            // 3.90.3, 3.93.1

    210. 

  210.                 $known_encoder_values[0xFF][58][2][1][3][2][20500] = '--preset studio';            // 3.93

    211. 

  211.                 $known_encoder_values[0xFF][57][2][1][3][4][20500] = '--preset studio';            // 3.94,   3.95

    212. 

  212.                 $known_encoder_values[0xC0][88][1][1][1][2][0]     = '--preset cd';                // 3.90,   3.90.1, 3.90.2,   3.91, 3.92

    213. 

  213.                 $known_encoder_values[0xC0][58][2][2][3][2][19600] = '--preset cd';                // 3.90.3, 3.93.1

    214. 

  214.                 $known_encoder_values[0xC0][58][2][2][3][2][19500] = '--preset cd';                // 3.93

    215. 

  215.                 $known_encoder_values[0xC0][57][2][1][3][4][19500] = '--preset cd';                // 3.94,   3.95

    216. 

  216.                 $known_encoder_values[0xA0][78][1][1][3][2][18000] = '--preset hifi';              // 3.90,   3.90.1, 3.90.2,   3.91, 3.92

    217. 

  217.                 $known_encoder_values[0xA0][58][2][2][3][2][18000] = '--preset hifi';              // 3.90.3, 3.93,   3.93.1

    218. 

  218.                 $known_encoder_values[0xA0][57][2][1][3][4][18000] = '--preset hifi';              // 3.94,   3.95

    219. 

  219.                 $known_encoder_values[0x80][67][1][1][3][2][18000] = '--preset tape';              // 3.90,   3.90.1, 3.90.2,   3.91, 3.92

    220. 

  220.                 $known_encoder_values[0x80][67][1][1][3][2][15000] = '--preset radio';             // 3.90,   3.90.1, 3.90.2,   3.91, 3.92

    221. 

  221.                 $known_encoder_values[0x70][67][1][1][3][2][15000] = '--preset fm';                // 3.90,   3.90.1, 3.90.2,   3.91, 3.92

    222. 

  222.                 $known_encoder_values[0x70][58][2][2][3][2][16000] = '--preset tape/radio/fm';     // 3.90.3, 3.93,   3.93.1

    223. 

  223.                 $known_encoder_values[0x70][57][2][1][3][4][16000] = '--preset tape/radio/fm';     // 3.94,   3.95

    224. 

  224.                 $known_encoder_values[0x38][58][2][2][0][2][10000] = '--preset voice';             // 3.90.3, 3.93,   3.93.1

    225. 

  225.                 $known_encoder_values[0x38][57][2][1][0][4][15000] = '--preset voice';             // 3.94,   3.95

    226. 

  226.                 $known_encoder_values[0x38][57][2][1][0][4][16000] = '--preset voice';             // 3.94a14

    227. 

  227.                 $known_encoder_values[0x28][65][1][1][0][2][7500]  = '--preset mw-us';             // 3.90,   3.90.1, 3.92

    228. 

  228.                 $known_encoder_values[0x28][65][1][1][0][2][7600]  = '--preset mw-us';             // 3.90.2, 3.91

    229. 

  229.                 $known_encoder_values[0x28][58][2][2][0][2][7000]  = '--preset mw-us';             // 3.90.3, 3.93,   3.93.1

    230. 

  230.                 $known_encoder_values[0x28][57][2][1][0][4][10500] = '--preset mw-us';             // 3.94,   3.95

    231. 

  231.                 $known_encoder_values[0x28][57][2][1][0][4][11200] = '--preset mw-us';             // 3.94a14

    232. 

  232.                 $known_encoder_values[0x28][57][2][1][0][4][8800]  = '--preset mw-us';             // 3.94a15

    233. 

  233.                 $known_encoder_values[0x18][58][2][2][0][2][4000]  = '--preset phon+/lw/mw-eu/sw'; // 3.90.3, 3.93.1

    234. 

  234.                 $known_encoder_values[0x18][58][2][2][0][2][3900]  = '--preset phon+/lw/mw-eu/sw'; // 3.93

    235. 

  235.                 $known_encoder_values[0x18][57][2][1][0][4][5900]  = '--preset phon+/lw/mw-eu/sw'; // 3.94,   3.95

    236. 

  236.                 $known_encoder_values[0x18][57][2][1][0][4][6200]  = '--preset phon+/lw/mw-eu/sw'; // 3.94a14

    237. 

  237.                 $known_encoder_values[0x18][57][2][1][0][4][3200]  = '--preset phon+/lw/mw-eu/sw'; // 3.94a15

    238. 

  238.                 $known_encoder_values[0x10][58][2][2][0][2][3800]  = '--preset phone';             // 3.90.3, 3.93.1

    239. 

  239.                 $known_encoder_values[0x10][58][2][2][0][2][3700]  = '--preset phone';             // 3.93

    240. 

  240.                 $known_encoder_values[0x10][57][2][1][0][4][5600]  = '--preset phone';             // 3.94,   3.95

    241. 

  241.             }

    242. 

  242. 

    243. 

  243.             if (isset($known_encoder_values[$thisfile_mpeg_audio_lame['raw']['abrbitrate_minbitrate']][$thisfile_mpeg_audio_lame['vbr_quality']][$thisfile_mpeg_audio_lame['raw']['vbr_method']][$thisfile_mpeg_audio_lame['raw']['noise_shaping']][$thisfile_mpeg_audio_lame['raw']['stereo_mode']][$thisfile_mpeg_audio_lame['ath_type']][$thisfile_mpeg_audio_lame['lowpass_frequency']])) {

    244. 

  244. 

    245. 

  245.                 $encoder_options = $known_encoder_values[$thisfile_mpeg_audio_lame['raw']['abrbitrate_minbitrate']][$thisfile_mpeg_audio_lame['vbr_quality']][$thisfile_mpeg_audio_lame['raw']['vbr_method']][$thisfile_mpeg_audio_lame['raw']['noise_shaping']][$thisfile_mpeg_audio_lame['raw']['stereo_mode']][$thisfile_mpeg_audio_lame['ath_type']][$thisfile_mpeg_audio_lame['lowpass_frequency']];

    246. 

  246. 

    247. 

  247.             } elseif (isset($known_encoder_values['**'][$thisfile_mpeg_audio_lame['vbr_quality']][$thisfile_mpeg_audio_lame['raw']['vbr_method']][$thisfile_mpeg_audio_lame['raw']['noise_shaping']][$thisfile_mpeg_audio_lame['raw']['stereo_mode']][$thisfile_mpeg_audio_lame['ath_type']][$thisfile_mpeg_audio_lame['lowpass_frequency']])) {

    248. 

  248. 

    249. 

  249.                 $encoder_options = $known_encoder_values['**'][$thisfile_mpeg_audio_lame['vbr_quality']][$thisfile_mpeg_audio_lame['raw']['vbr_method']][$thisfile_mpeg_audio_lame['raw']['noise_shaping']][$thisfile_mpeg_audio_lame['raw']['stereo_mode']][$thisfile_mpeg_audio_lame['ath_type']][$thisfile_mpeg_audio_lame['lowpass_frequency']];

    250. 

  250. 

    251. 

  251.             } elseif ($info['audio']['bitrate_mode'] == 'vbr') {

    252. 

  252. 

    253. 

  253.                 // http://gabriel.mp3-tech.org/mp3infotag.html

    254. 

  254.                 // int    Quality = (100 - 10 * gfp->VBR_q - gfp->quality)h

    255. 

  255. 

    256. 

  256. 

    257. 

  257.                 $lame_v_value = 10 - ceil($thisfile_mpeg_audio_lame['vbr_quality'] / 10);

    258. 

  258.                 $lame_q_value = 100 - $thisfile_mpeg_audio_lame['vbr_quality'] - ($lame_v_value * 10);

    259. 

  259.                 $encoder_options = '-V'.$lame_v_value.' -q'.$lame_q_value;

    260. 

  260. 

    261. 

  261.             } elseif ($info['audio']['bitrate_mode'] == 'cbr') {

    262. 

  262. 

    263. 

  263.                 $encoder_options = strtoupper($info['audio']['bitrate_mode']).ceil($info['audio']['bitrate'] / 1000);

    264. 

  264. 

    265. 

  265.             } else {

    266. 

  266. 

    267. 

  267.                 $encoder_options = strtoupper($info['audio']['bitrate_mode']);

    268. 

  268. 

    269. 

  269.             }

    270. 

  270. 

    271. 

  271.         } elseif (!empty($thisfile_mpeg_audio_lame['bitrate_abr'])) {

    272. 

  272. 

    273. 

  273.             $encoder_options = 'ABR'.$thisfile_mpeg_audio_lame['bitrate_abr'];

    274. 

  274. 

    275. 

  275.         } elseif (!empty($info['audio']['bitrate'])) {

    276. 

  276. 

    277. 

  277.             if ($info['audio']['bitrate_mode'] == 'cbr') {

    278. 

  278.                 $encoder_options = strtoupper($info['audio']['bitrate_mode']).ceil($info['audio']['bitrate'] / 1000);

    279. 

  279.             } else {

    280. 

  280.                 $encoder_options = strtoupper($info['audio']['bitrate_mode']);

    281. 

  281.             }

    282. 

  282. 

    283. 

  283.         }

    284. 

  284.         if (!empty($thisfile_mpeg_audio_lame['bitrate_min'])) {

    285. 

  285.             $encoder_options .= ' -b'.$thisfile_mpeg_audio_lame['bitrate_min'];

    286. 

  286.         }

    287. 

  287. 

    288. 

  288.         if (@$thisfile_mpeg_audio_lame['encoding_flags']['nogap_prev'] || @$thisfile_mpeg_audio_lame['encoding_flags']['nogap_next']) {

    289. 

  289.             $encoder_options .= ' --nogap';

    290. 

  290.         }

    291. 

  291. 

    292. 

  292.         if (!empty($thisfile_mpeg_audio_lame['lowpass_frequency'])) {

    293. 

  293.             $exploded_options = explode(' ', $encoder_options, 4);

    294. 

  294.             if ($exploded_options[0] == '--r3mix') {

    295. 

  295.                 $exploded_options[1] = 'r3mix';

    296. 

  296.             }

    297. 

  297.             switch ($exploded_options[0]) {

    298. 

  298.                 case '--preset':

    299. 

  299.                 case '--alt-preset':

    300. 

  300.                 case '--r3mix':

    301. 

  301.                     if ($exploded_options[1] == 'fast') {

    302. 

  302.                         $exploded_options[1] .= ' '.$exploded_options[2];

    303. 

  303.                     }

    304. 

  304.                     switch ($exploded_options[1]) {

    305. 

  305.                         case 'portable':

    306. 

  306.                         case 'medium':

    307. 

  307.                         case 'standard':

    308. 

  308.                         case 'extreme':

    309. 

  309.                         case 'insane':

    310. 

  310.                         case 'fast portable':

    311. 

  311.                         case 'fast medium':

    312. 

  312.                         case 'fast standard':

    313. 

  313.                         case 'fast extreme':

    314. 

  314.                         case 'fast insane':

    315. 

  315.                         case 'r3mix':

    316. 

  316.                             static $expected_lowpass = array (

    317. 

  317.                                     'insane|20500'        => 20500,

    318. 

  318.                                     'insane|20600'        => 20600,  // 3.90.2, 3.90.3, 3.91

    319. 

  319.                                     'medium|18000'        => 18000,

    320. 

  320.                                     'fast medium|18000'   => 18000,

    321. 

  321.                                     'extreme|19500'       => 19500,  // 3.90,   3.90.1, 3.92, 3.95

    322. 

  322.                                     'extreme|19600'       => 19600,  // 3.90.2, 3.90.3, 3.91, 3.93.1

    323. 

  323.                                     'fast extreme|19500'  => 19500,  // 3.90,   3.90.1, 3.92, 3.95

    324. 

  324.                                     'fast extreme|19600'  => 19600,  // 3.90.2, 3.90.3, 3.91, 3.93.1

    325. 

  325.                                     'standard|19000'      => 19000,

    326. 

  326.                                     'fast standard|19000' => 19000,

    327. 

  327.                                     'r3mix|19500'         => 19500,  // 3.90,   3.90.1, 3.92

    328. 

  328.                                     'r3mix|19600'         => 19600,  // 3.90.2, 3.90.3, 3.91

    329. 

  329.                                     'r3mix|18000'         => 18000,  // 3.94,   3.95

    330. 

  330.                                 );

    331. 

  331.                             if (!isset($expected_lowpass[$exploded_options[1].'|'.$thisfile_mpeg_audio_lame['lowpass_frequency']]) && ($thisfile_mpeg_audio_lame['lowpass_frequency'] < 22050) && (round($thisfile_mpeg_audio_lame['lowpass_frequency'] / 1000) < round($thisfile_mpeg_audio['sample_rate'] / 2000))) {

    332. 

  332.                                 $encoder_options .= ' --lowpass '.$thisfile_mpeg_audio_lame['lowpass_frequency'];

    333. 

  333.                             }

    334. 

  334.                             break;

    335. 

  335. 

    336. 

  336.                         default:

    337. 

  337.                             break;

    338. 

  338.                     }

    339. 

  339.                     break;

    340. 

  340.             }

    341. 

  341.         }

    342. 

  342. 

    343. 

  343.         if (isset($thisfile_mpeg_audio_lame['raw']['source_sample_freq'])) {

    344. 

  344.             if (($thisfile_mpeg_audio['sample_rate'] == 44100) && ($thisfile_mpeg_audio_lame['raw']['source_sample_freq'] != 1)) {

    345. 

  345.                 $encoder_options .= ' --resample 44100';

    346. 

  346.             } elseif (($thisfile_mpeg_audio['sample_rate'] == 48000) && ($thisfile_mpeg_audio_lame['raw']['source_sample_freq'] != 2)) {

    347. 

  347.                 $encoder_options .= ' --resample 48000';

    348. 

  348.             } elseif ($thisfile_mpeg_audio['sample_rate'] < 44100) {

    349. 

  349.                 switch ($thisfile_mpeg_audio_lame['raw']['source_sample_freq']) {

    350. 

  350.                     case 0: // <= 32000

    351. 

  351.                         // may or may not be same as source frequency - ignore

    352. 

  352.                         break;

    353. 

  353.                     case 1: // 44100

    354. 

  354.                     case 2: // 48000

    355. 

  355.                     case 3: // 48000+

    356. 

  356.                         $exploded_options = explode(' ', $encoder_options, 4);

    357. 

  357.                         switch ($exploded_options[0]) {

    358. 

  358.                             case '--preset':

    359. 

  359.                             case '--alt-preset':

    360. 

  360.                                 switch ($exploded_options[1]) {

    361. 

  361.                                     case 'fast':

    362. 

  362.                                     case 'portable':

    363. 

  363.                                     case 'medium':

    364. 

  364.                                     case 'standard':

    365. 

  365.                                     case 'extreme':

    366. 

  366.                                     case 'insane':

    367. 

  367.                                         $encoder_options .= ' --resample '.$thisfile_mpeg_audio['sample_rate'];

    368. 

  368.                                         break;

    369. 

  369. 

    370. 

  370.                                     default:

    371. 

  371.                                         static $expected_resampled_rate = array (

    372. 

  372.                                                 'phon+/lw/mw-eu/sw|16000' => 16000,

    373. 

  373.                                                 'mw-us|24000'             => 24000, // 3.95

    374. 

  374.                                                 'mw-us|32000'             => 32000, // 3.93

    375. 

  375.                                                 'mw-us|16000'             => 16000, // 3.92

    376. 

  376.                                                 'phone|16000'             => 16000,

    377. 

  377.                                                 'phone|11025'             => 11025, // 3.94a15

    378. 

  378.                                                 'radio|32000'             => 32000, // 3.94a15

    379. 

  379.                                                 'fm/radio|32000'          => 32000, // 3.92

    380. 

  380.                                                 'fm|32000'                => 32000, // 3.90

    381. 

  381.                                                 'voice|32000'             => 32000);

    382. 

  382.                                         if (!isset($expected_resampled_rate[$exploded_options[1].'|'.$thisfile_mpeg_audio['sample_rate']])) {

    383. 

  383.                                             $encoder_options .= ' --resample '.$thisfile_mpeg_audio['sample_rate'];

    384. 

  384.                                         }

    385. 

  385.                                         break;

    386. 

  386.                                 }

    387. 

  387.                                 break;

    388. 

  388. 

    389. 

  389.                             case '--r3mix':

    390. 

  390.                             default:

    391. 

  391.                                 $encoder_options .= ' --resample '.$thisfile_mpeg_audio['sample_rate'];

    392. 

  392.                                 break;

    393. 

  393.                         }

    394. 

  394.                         break;

    395. 

  395.                 }

    396. 

  396.             }

    397. 

  397.         }

    398. 

  398.         if (empty($encoder_options) && !empty($info['audio']['bitrate']) && !empty($info['audio']['bitrate_mode'])) {

    399. 

  399.             //$encoder_options = strtoupper($info['audio']['bitrate_mode']).ceil($info['audio']['bitrate'] / 1000);

    400. 

  400.             $encoder_options = strtoupper($info['audio']['bitrate_mode']);

    401. 

  401.         }

    402. 

  402. 

    403. 

  403.         return $encoder_options;

    404. 

  404.     }

    405. 

  405. 

    406. 

  406. 

    407. 

  407.     

    408. 

  408.     public function decodeMPEGaudioHeader($fd, $offset, &$info, $recursive_search=true, $scan_as_cbr=false, $fast_mpeg_header_scan=false) {

    409. 

  409. 

    410. 

  410.         static $mpeg_audio_version_lookup;

    411. 

  411.         static $mpeg_audio_layer_lookup;

    412. 

  412.         static $mpeg_audio_bitrate_lookup;

    413. 

  413.         static $mpeg_audio_frequency_lookup;

    414. 

  414.         static $mpeg_audio_channel_mode_lookup;

    415. 

  415.         static $mpeg_audio_mode_extension_lookup;

    416. 

  416.         static $mpeg_audio_emphasis_lookup;

    417. 

  417.         if (empty($mpeg_audio_version_lookup)) {

    418. 

  418.             $mpeg_audio_version_lookup        = getid3_mp3::MPEGaudioVersionarray();

    419. 

  419.             $mpeg_audio_layer_lookup          = getid3_mp3::MPEGaudioLayerarray();

    420. 

  420.             $mpeg_audio_bitrate_lookup        = getid3_mp3::MPEGaudioBitratearray();

    421. 

  421.             $mpeg_audio_frequency_lookup      = getid3_mp3::MPEGaudioFrequencyarray();

    422. 

  422.             $mpeg_audio_channel_mode_lookup   = getid3_mp3::MPEGaudioChannelModearray();

    423. 

  423.             $mpeg_audio_mode_extension_lookup = getid3_mp3::MPEGaudioModeExtensionarray();

    424. 

  424.             $mpeg_audio_emphasis_lookup       = getid3_mp3::MPEGaudioEmphasisarray();

    425. 

  425.         }

    426. 

  426. 

    427. 

  427.         if ($offset >= $info['avdataend']) {

    428. 

  428. 

    429. 

  429.             // non-fatal error: 'end of file encounter looking for MPEG synch'

    430. 

  430.             return;

    431. 

  431.             

    432. 

  432.         }

    433. 

  433.         fseek($fd, $offset, SEEK_SET);

    434. 

  434.         $header_string = fread($fd, 226); // LAME header at offset 36 + 190 bytes of Xing/LAME data

    435. 

  435. 

    436. 

  436.         // MP3 audio frame structure:

    437. 

  437.         // $aa $aa $aa $aa [$bb $bb] $cc...

    438. 

  438.         // where $aa..$aa is the four-byte mpeg-audio header (below)

    439. 

  439.         // $bb $bb is the optional 2-byte CRC

    440. 

  440.         // and $cc... is the audio data

    441. 

  441. 

    442. 

  442.         $head4 = substr($header_string, 0, 4);

    443. 

  443. 

    444. 

  444.         if (isset($mpeg_audio_header_decode_cache[$head4])) {

    445. 

  445.             $mpeg_header_raw_array= $mpeg_audio_header_decode_cache[$head4];

    446. 

  446.         } else {

    447. 

  447.             $mpeg_header_raw_array = getid3_mp3::MPEGaudioHeaderDecode($head4);

    448. 

  448.             $mpeg_audio_header_decode_cache[$head4] = $mpeg_header_raw_array;

    449. 

  449.         }

    450. 

  450. 

    451. 

  451.         // Not in cache

    452. 

  452.         if (!isset($mpeg_audio_header_valid_cache[$head4])) {

    453. 

  453.             $mpeg_audio_header_valid_cache[$head4] = getid3_mp3::MPEGaudioHeaderValid($mpeg_header_raw_array, false, false);

    454. 

  454.         }

    455. 

  455. 

    456. 

  456.         // shortcut

    457. 

  457.         if (!isset($info['mpeg']['audio'])) {

    458. 

  458.             $info['mpeg']['audio'] = array ();

    459. 

  459.         }

    460. 

  460.         $thisfile_mpeg_audio = &$info['mpeg']['audio'];

    461. 

  461. 

    462. 

  462. 

    463. 

  463.         if ($mpeg_audio_header_valid_cache[$head4]) {

    464. 

  464.             $thisfile_mpeg_audio['raw'] = $mpeg_header_raw_array;

    465. 

  465.         } else {

    466. 

  466.             

    467. 

  467.             // non-fatal error: Invalid MPEG audio header at offset $offset

    468. 

  468.             return;

    469. 

  469.         }

    470. 

  470. 

    471. 

  471.         if (!$fast_mpeg_header_scan) {

    472. 

  472. 

    473. 

  473.             $thisfile_mpeg_audio['version']       = $mpeg_audio_version_lookup[$thisfile_mpeg_audio['raw']['version']];

    474. 

  474.             $thisfile_mpeg_audio['layer']         = $mpeg_audio_layer_lookup[$thisfile_mpeg_audio['raw']['layer']];

    475. 

  475. 

    476. 

  476.             $thisfile_mpeg_audio['channelmode']   = $mpeg_audio_channel_mode_lookup[$thisfile_mpeg_audio['raw']['channelmode']];

    477. 

  477.             $thisfile_mpeg_audio['channels']      = (($thisfile_mpeg_audio['channelmode'] == 'mono') ? 1 : 2);

    478. 

  478.             $thisfile_mpeg_audio['sample_rate']   = $mpeg_audio_frequency_lookup[$thisfile_mpeg_audio['version']][$thisfile_mpeg_audio['raw']['sample_rate']];

    479. 

  479.             $thisfile_mpeg_audio['protection']    = !$thisfile_mpeg_audio['raw']['protection'];

    480. 

  480.             $thisfile_mpeg_audio['private']       = (bool) $thisfile_mpeg_audio['raw']['private'];

    481. 

  481.             $thisfile_mpeg_audio['modeextension'] = $mpeg_audio_mode_extension_lookup[$thisfile_mpeg_audio['layer']][$thisfile_mpeg_audio['raw']['modeextension']];

    482. 

  482.             $thisfile_mpeg_audio['copyright']     = (bool) $thisfile_mpeg_audio['raw']['copyright'];

    483. 

  483.             $thisfile_mpeg_audio['original']      = (bool) $thisfile_mpeg_audio['raw']['original'];

    484. 

  484.             $thisfile_mpeg_audio['emphasis']      = $mpeg_audio_emphasis_lookup[$thisfile_mpeg_audio['raw']['emphasis']];

    485. 

  485. 

    486. 

  486.             $info['audio']['channels']    = $thisfile_mpeg_audio['channels'];

    487. 

  487.             $info['audio']['sample_rate'] = $thisfile_mpeg_audio['sample_rate'];

    488. 

  488. 

    489. 

  489.             if ($thisfile_mpeg_audio['protection']) {

    490. 

  490.                 $thisfile_mpeg_audio['crc'] = getid3_lib::BigEndian2Int(substr($header_string, 4, 2));

    491. 

  491.             }

    492. 

  492. 

    493. 

  493.         }

    494. 

  494. 

    495. 

  495.         if ($thisfile_mpeg_audio['raw']['bitrate'] == 15) {

    496. 

  496.             // http://www.hydrogenaudio.org/?act=ST&f=16&t=9682&st=0

    497. 

  497.             $this->getid3->warning('Invalid bitrate index (15), this is a known bug in free-format MP3s encoded by LAME v3.90 - 3.93.1');

    498. 

  498.             $thisfile_mpeg_audio['raw']['bitrate'] = 0;

    499. 

  499.         }

    500. 

  500.         $thisfile_mpeg_audio['padding'] = (bool) $thisfile_mpeg_audio['raw']['padding'];

    501. 

  501.         $thisfile_mpeg_audio['bitrate'] = $mpeg_audio_bitrate_lookup[$thisfile_mpeg_audio['version']][$thisfile_mpeg_audio['layer']][$thisfile_mpeg_audio['raw']['bitrate']];

    502. 

  502. 

    503. 

  503.         if (($thisfile_mpeg_audio['bitrate'] == 'free') && ($offset == $info['avdataoffset'])) {

    504. 

  504.             // only skip multiple frame check if free-format bitstream found at beginning of file

    505. 

  505.             // otherwise is quite possibly simply corrupted data

    506. 

  506.             $recursive_search = false;

    507. 

  507.         }

    508. 

  508. 

    509. 

  509.         // For Layer 2 there are some combinations of bitrate and mode which are not allowed.

    510. 

  510.         if (!$fast_mpeg_header_scan && ($thisfile_mpeg_audio['layer'] == '2')) {

    511. 

  511. 

    512. 

  512.             $info['audio']['dataformat'] = 'mp2';

    513. 

  513.             switch ($thisfile_mpeg_audio['channelmode']) {

    514. 

  514. 

    515. 

  515.                 case 'mono':

    516. 

  516.                     if (($thisfile_mpeg_audio['bitrate'] == 'free') || ($thisfile_mpeg_audio['bitrate'] <= 192000)) {

    517. 

  517.                         // these are ok

    518. 

  518.                     } else {

    519. 

  519.                         

    520. 

  520.                         // non-fatal error: bitrate not allowed in Layer 2/mono

    521. 

  521.                         return;

    522. 

  522.                     }

    523. 

  523.                     break;

    524. 

  524. 

    525. 

  525.                 case 'stereo':

    526. 

  526.                 case 'joint stereo':

    527. 

  527.                 case 'dual channel':

    528. 

  528.                     if (($thisfile_mpeg_audio['bitrate'] == 'free') || ($thisfile_mpeg_audio['bitrate'] == 64000) || ($thisfile_mpeg_audio['bitrate'] >= 96000)) {

    529. 

  529.                         // these are ok

    530. 

  530.                     } else {

    531. 

  531.                         

    532. 

  532.                         // non-fatal error: bitrate not allowed in Layer 2/stereo/joint stereo/dual channel

    533. 

  533.                         return;

    534. 

  534.                     }

    535. 

  535.                     break;

    536. 

  536. 

    537. 

  537.             }

    538. 

  538. 

    539. 

  539.         }

    540. 

  540. 

    541. 

  541. 

    542. 

  542.         if ($info['audio']['sample_rate'] > 0) {

    543. 

  543.             $thisfile_mpeg_audio['framelength'] = getid3_mp3::MPEGaudioFrameLength($thisfile_mpeg_audio['bitrate'], $thisfile_mpeg_audio['version'], $thisfile_mpeg_audio['layer'], (int) $thisfile_mpeg_audio['padding'], $info['audio']['sample_rate']);

    544. 

  544.         }

    545. 

  545. 

    546. 

  546.         $next_frame_test_offset = $offset + 1;

    547. 

  547.         if ($thisfile_mpeg_audio['bitrate'] != 'free') {

    548. 

  548. 

    549. 

  549.             $info['audio']['bitrate'] = $thisfile_mpeg_audio['bitrate'];

    550. 

  550. 

    551. 

  551.             if (isset($thisfile_mpeg_audio['framelength'])) {

    552. 

  552.                 $next_frame_test_offset = $offset + $thisfile_mpeg_audio['framelength'];

    553. 

  553.             } else {

    554. 

  554. 

    555. 

  555.                 // non-fatal error: Frame at offset('.$offset.') is has an invalid frame length.

    556. 

  556.                 return;

    557. 

  557.             }

    558. 

  558. 

    559. 

  559.         }

    560. 

  560. 

    561. 

  561.         $expected_number_of_audio_bytes = 0;

    562. 

  562. 

    563. 

  563.         ////////////////////////////////////////////////////////////////////////////////////

    564. 

  564.         // Variable-bitrate headers

    565. 

  565. 

    566. 

  566.         if (substr($header_string, 4 + 32, 4) == 'VBRI') {

    567. 

  567.             // Fraunhofer VBR header is hardcoded 'VBRI' at offset 0x24 (36)

    568. 

  568.             // specs taken from http://minnie.tuhs.org/pipermail/mp3encoder/2001-January/001800.html

    569. 

  569. 

    570. 

  570.             $thisfile_mpeg_audio['bitrate_mode'] = 'vbr';

    571. 

  571.             $thisfile_mpeg_audio['VBR_method']   = 'Fraunhofer';

    572. 

  572.             $info['audio']['codec']                = 'Fraunhofer';

    573. 

  573. 

    574. 

  574.             $side_info_data = substr($header_string, 4 + 2, 32);

    575. 

  575. 

    576. 

  576.             $fraunhofer_vbr_offset = 36;

    577. 

  577. 

    578. 

  578.             $thisfile_mpeg_audio['VBR_encoder_version']     = getid3_lib::BigEndian2Int(substr($header_string, $fraunhofer_vbr_offset +  4, 2)); // VbriVersion

    579. 

  579.             $thisfile_mpeg_audio['VBR_encoder_delay']       = getid3_lib::BigEndian2Int(substr($header_string, $fraunhofer_vbr_offset +  6, 2)); // VbriDelay

    580. 

  580.             $thisfile_mpeg_audio['VBR_quality']             = getid3_lib::BigEndian2Int(substr($header_string, $fraunhofer_vbr_offset +  8, 2)); // VbriQuality

    581. 

  581.             $thisfile_mpeg_audio['VBR_bytes']               = getid3_lib::BigEndian2Int(substr($header_string, $fraunhofer_vbr_offset + 10, 4)); // VbriStreamBytes

    582. 

  582.             $thisfile_mpeg_audio['VBR_frames']              = getid3_lib::BigEndian2Int(substr($header_string, $fraunhofer_vbr_offset + 14, 4)); // VbriStreamFrames

    583. 

  583.             $thisfile_mpeg_audio['VBR_seek_offsets']        = getid3_lib::BigEndian2Int(substr($header_string, $fraunhofer_vbr_offset + 18, 2)); // VbriTableSize

    584. 

  584.             $thisfile_mpeg_audio['VBR_seek_scale']          = getid3_lib::BigEndian2Int(substr($header_string, $fraunhofer_vbr_offset + 20, 2)); // VbriTableScale

    585. 

  585.             $thisfile_mpeg_audio['VBR_entry_bytes']         = getid3_lib::BigEndian2Int(substr($header_string, $fraunhofer_vbr_offset + 22, 2)); // VbriEntryBytes

    586. 

  586.             $thisfile_mpeg_audio['VBR_entry_frames']        = getid3_lib::BigEndian2Int(substr($header_string, $fraunhofer_vbr_offset + 24, 2)); // VbriEntryFrames

    587. 

  587. 

    588. 

  588.             $expected_number_of_audio_bytes = $thisfile_mpeg_audio['VBR_bytes'];

    589. 

  589. 

    590. 

  590.             $previous_byte_offset = $offset;

    591. 

  591.             for ($i = 0; $i < $thisfile_mpeg_audio['VBR_seek_offsets']; $i++) {

    592. 

  592.                 $fraunhofer_offset_n = getid3_lib::BigEndian2Int(substr($header_string, $fraunhofer_vbr_offset, $thisfile_mpeg_audio['VBR_entry_bytes']));

    593. 

  593.                 $fraunhofer_vbr_offset += $thisfile_mpeg_audio['VBR_entry_bytes'];

    594. 

  594.                 $thisfile_mpeg_audio['VBR_offsets_relative'][$i] = ($fraunhofer_offset_n * $thisfile_mpeg_audio['VBR_seek_scale']);

    595. 

  595.                 $thisfile_mpeg_audio['VBR_offsets_absolute'][$i] = ($fraunhofer_offset_n * $thisfile_mpeg_audio['VBR_seek_scale']) + $previous_byte_offset;

    596. 

  596.                 $previous_byte_offset += $fraunhofer_offset_n;

    597. 

  597.             }

    598. 

  598. 

    599. 

  599. 

    600. 

  600.         } else {

    601. 

  601. 

    602. 

  602.             // Xing VBR header is hardcoded 'Xing' at a offset 0x0D (13), 0x15 (21) or 0x24 (36)

    603. 

  603.             // depending on MPEG layer and number of channels

    604. 

  604. 

    605. 

  605.             $vbr_id_offset = getid3_mp3::XingVBRidOffset($thisfile_mpeg_audio['version'], $thisfile_mpeg_audio['channelmode']);

    606. 

  606.             $side_info_data = substr($header_string, 4 + 2, $vbr_id_offset - 4);

    607. 

  607. 

    608. 

  608.             if ((substr($header_string, $vbr_id_offset, strlen('Xing')) == 'Xing') || (substr($header_string, $vbr_id_offset, strlen('Info')) == 'Info')) {

    609. 

  609.                 // 'Xing' is traditional Xing VBR frame

    610. 

  610.                 // 'Info' is LAME-encoded CBR (This was done to avoid CBR files to be recognized as traditional Xing VBR files by some decoders.)

    611. 

  611.                 // 'Info' *can* legally be used to specify a VBR file as well, however.

    612. 

  612. 

    613. 

  613.                 // http://www.multiweb.cz/twoinches/MP3inside.htm

    614. 

  614.                 //00..03 = "Xing" or "Info"

    615. 

  615.                 //04..07 = Flags:

    616. 

  616.                 //  0x01  Frames Flag     set if value for number of frames in file is stored

    617. 

  617.                 //  0x02  Bytes Flag      set if value for filesize in bytes is stored

    618. 

  618.                 //  0x04  TOC Flag        set if values for TOC are stored

    619. 

  619.                 //  0x08  VBR Scale Flag  set if values for VBR scale is stored

    620. 

  620.                 //08..11  Frames: Number of frames in file (including the first Xing/Info one)

    621. 

  621.                 //12..15  Bytes:  File length in Bytes

    622. 

  622.                 //16..115  TOC (Table of Contents):

    623. 

  623.                 //  Contains of 100 indexes (one Byte length) for easier lookup in file. Approximately solves problem with moving inside file.

    624. 

  624.                 //  Each Byte has a value according this formula:

    625. 

  625.                 //  (TOC[i] / 256) * fileLenInBytes

    626. 

  626.                 //  So if song lasts eg. 240 sec. and you want to jump to 60. sec. (and file is 5 000 000 Bytes length) you can use:

    627. 

  627.                 //  TOC[(60/240)*100] = TOC[25]

    628. 

  628.                 //  and corresponding Byte in file is then approximately at:

    629. 

  629.                 //  (TOC[25]/256) * 5000000

    630. 

  630.                 //116..119  VBR Scale

    631. 

  631. 

    632. 

  632. 

    633. 

  633.                 // should be safe to leave this at 'vbr' and let it be overriden to 'cbr' if a CBR preset/mode is used by LAME

    634. 

  634.                 $thisfile_mpeg_audio['bitrate_mode'] = 'vbr';

    635. 

  635.                 $thisfile_mpeg_audio['VBR_method']   = 'Xing';

    636. 

  636. 

    637. 

  637.                 $thisfile_mpeg_audio['xing_flags_raw'] = getid3_lib::BigEndian2Int(substr($header_string, $vbr_id_offset + 4, 4));

    638. 

  638. 

    639. 

  639.                 $thisfile_mpeg_audio['xing_flags']['frames']    = (bool) ($thisfile_mpeg_audio['xing_flags_raw'] & 0x00000001);

    640. 

  640.                 $thisfile_mpeg_audio['xing_flags']['bytes']     = (bool) ($thisfile_mpeg_audio['xing_flags_raw'] & 0x00000002);

    641. 

  641.                 $thisfile_mpeg_audio['xing_flags']['toc']       = (bool) ($thisfile_mpeg_audio['xing_flags_raw'] & 0x00000004);

    642. 

  642.                 $thisfile_mpeg_audio['xing_flags']['vbr_scale'] = (bool) ($thisfile_mpeg_audio['xing_flags_raw'] & 0x00000008);

    643. 

  643. 

    644. 

  644.                 if ($thisfile_mpeg_audio['xing_flags']['frames']) {

    645. 

  645.                     $thisfile_mpeg_audio['VBR_frames'] = getid3_lib::BigEndian2Int(substr($header_string, $vbr_id_offset +  8, 4));

    646. 

  646.                 }

    647. 

  647.                 if ($thisfile_mpeg_audio['xing_flags']['bytes']) {

    648. 

  648.                     $thisfile_mpeg_audio['VBR_bytes']  = getid3_lib::BigEndian2Int(substr($header_string, $vbr_id_offset + 12, 4));

    649. 

  649.                 }

    650. 

  650. 

    651. 

  651.                 if (!empty($thisfile_mpeg_audio['VBR_frames']) && !empty($thisfile_mpeg_audio['VBR_bytes'])) {

    652. 

  652. 

    653. 

  653.                     $frame_lengthfloat = $thisfile_mpeg_audio['VBR_bytes'] / $thisfile_mpeg_audio['VBR_frames'];

    654. 

  654. 

    655. 

  655.                     if ($thisfile_mpeg_audio['layer'] == '1') {

    656. 

  656.                         // BitRate = (((FrameLengthInBytes / 4) - Padding) * SampleRate) / 12

    657. 

  657.                         $info['audio']['bitrate'] = ($frame_lengthfloat / 4) * $thisfile_mpeg_audio['sample_rate'] * (2 / $info['audio']['channels']) / 12;

    658. 

  658.                     } else {

    659. 

  659.                         // Bitrate = ((FrameLengthInBytes - Padding) * SampleRate) / 144

    660. 

  660.                         $info['audio']['bitrate'] = $frame_lengthfloat * $thisfile_mpeg_audio['sample_rate'] * (2 / $info['audio']['channels']) / 144;

    661. 

  661.                     }

    662. 

  662.                     $thisfile_mpeg_audio['framelength'] = floor($frame_lengthfloat);

    663. 

  663.                 }

    664. 

  664. 

    665. 

  665.                 if ($thisfile_mpeg_audio['xing_flags']['toc']) {

    666. 

  666.                     $lame_toc_data = substr($header_string, $vbr_id_offset + 16, 100);

    667. 

  667.                     for ($i = 0; $i < 100; $i++) {

    668. 

  668.                         $thisfile_mpeg_audio['toc'][$i] = ord($lame_toc_data{$i});

    669. 

  669.                     }

    670. 

  670.                 }

    671. 

  671.                 if ($thisfile_mpeg_audio['xing_flags']['vbr_scale']) {

    672. 

  672.                     $thisfile_mpeg_audio['VBR_scale'] = getid3_lib::BigEndian2Int(substr($header_string, $vbr_id_offset + 116, 4));

    673. 

  673.                 }

    674. 

  674. 

    675. 

  675. 

    676. 

  676.                 // http://gabriel.mp3-tech.org/mp3infotag.html

    677. 

  677.                 if (substr($header_string, $vbr_id_offset + 120, 4) == 'LAME') {

    678. 

  678. 

    679. 

  679.                     // shortcut

    680. 

  680.                     $thisfile_mpeg_audio['LAME'] = array ();

    681. 

  681.                     $thisfile_mpeg_audio_lame    = &$thisfile_mpeg_audio['LAME'];

    682. 

  682. 

    683. 

  683. 

    684. 

  684.                     $thisfile_mpeg_audio_lame['long_version']  = substr($header_string, $vbr_id_offset + 120, 20);

    685. 

  685.                     $thisfile_mpeg_audio_lame['short_version'] = substr($thisfile_mpeg_audio_lame['long_version'], 0, 9);

    686. 

  686. 

    687. 

  687.                     if ($thisfile_mpeg_audio_lame['short_version'] >= 'LAME3.90') {

    688. 

  688. 

    689. 

  689.                         // extra 11 chars are not part of version string when LAMEtag present

    690. 

  690.                         unset($thisfile_mpeg_audio_lame['long_version']);

    691. 

  691. 

    692. 

  692.                         // It the LAME tag was only introduced in LAME v3.90

    693. 

  693.                         // http://www.hydrogenaudio.org/?act=ST&f=15&t=9933

    694. 

  694. 

    695. 

  695.                         // Offsets of various bytes in http://gabriel.mp3-tech.org/mp3infotag.html

    696. 

  696.                         // are assuming a 'Xing' identifier offset of 0x24, which is the case for

    697. 

  697.                         // MPEG-1 non-mono, but not for other combinations

    698. 

  698.                         $lame_tag_offset_contant = $vbr_id_offset - 0x24;

    699. 

  699. 

    700. 

  700.                         // shortcuts

    701. 

  701.                         $thisfile_mpeg_audio_lame['RGAD']    = array ('track'=>array(), 'album'=>array());

    702. 

  702.                         $thisfile_mpeg_audio_lame_rgad       = &$thisfile_mpeg_audio_lame['RGAD'];

    703. 

  703.                         $thisfile_mpeg_audio_lame_rgad_track = &$thisfile_mpeg_audio_lame_rgad['track'];

    704. 

  704.                         $thisfile_mpeg_audio_lame_rgad_album = &$thisfile_mpeg_audio_lame_rgad['album'];

    705. 

  705.                         $thisfile_mpeg_audio_lame['raw']     = array ();

    706. 

  706.                         $thisfile_mpeg_audio_lame_raw        = &$thisfile_mpeg_audio_lame['raw'];

    707. 

  707. 

    708. 

  708.                         // byte $9B  VBR Quality

    709. 

  709.                         // This field is there to indicate a quality level, although the scale was not precised in the original Xing specifications.

    710. 

  710.                         // Actually overwrites original Xing bytes

    711. 

  711.                         unset($thisfile_mpeg_audio['VBR_scale']);

    712. 

  712.                         $thisfile_mpeg_audio_lame['vbr_quality'] = getid3_lib::BigEndian2Int(substr($header_string, $lame_tag_offset_contant + 0x9B, 1));

    713. 

  713. 

    714. 

  714.                         // bytes $9C-$A4  Encoder short VersionString

    715. 

  715.                         $thisfile_mpeg_audio_lame['short_version'] = substr($header_string, $lame_tag_offset_contant + 0x9C, 9);

    716. 

  716. 

    717. 

  717.                         // byte $A5  Info Tag revision + VBR method

    718. 

  718.                         $lame_tagRevisionVBRmethod = getid3_lib::BigEndian2Int(substr($header_string, $lame_tag_offset_contant + 0xA5, 1));

    719. 

  719. 

    720. 

  720.                         $thisfile_mpeg_audio_lame['tag_revision']      = ($lame_tagRevisionVBRmethod & 0xF0) >> 4;

    721. 

  721.                         $thisfile_mpeg_audio_lame_raw['vbr_method'] =  $lame_tagRevisionVBRmethod & 0x0F;

    722. 

  722.                         $thisfile_mpeg_audio_lame['vbr_method']        = getid3_mp3::LAMEvbrMethodLookup($thisfile_mpeg_audio_lame_raw['vbr_method']);

    723. 

  723.                         $thisfile_mpeg_audio['bitrate_mode']           = substr($thisfile_mpeg_audio_lame['vbr_method'], 0, 3); // usually either 'cbr' or 'vbr', but truncates 'vbr-old / vbr-rh' to 'vbr'

    724. 

  724. 

    725. 

  725.                         // byte $A6  Lowpass filter value

    726. 

  726.                         $thisfile_mpeg_audio_lame['lowpass_frequency'] = getid3_lib::BigEndian2Int(substr($header_string, $lame_tag_offset_contant + 0xA6, 1)) * 100;

    727. 

  727. 

    728. 

  728.                         // bytes $A7-$AE  Replay Gain

    729. 

  729.                         // http://privatewww.essex.ac.uk/~djmrob/replaygain/rg_data_format.html

    730. 

  730.                         // bytes $A7-$AA : 32 bit floating point "Peak signal amplitude"

    731. 

  731.                         if ($thisfile_mpeg_audio_lame['short_version'] >= 'LAME3.94b') {

    732. 

  732.                             // LAME 3.94a16 and later - 9.23 fixed point

    733. 

  733.                             // ie 0x0059E2EE / (2^23) = 5890798 / 8388608 = 0.7022378444671630859375

    734. 

  734.                             $thisfile_mpeg_audio_lame_rgad['peak_amplitude'] = (float) ((getid3_lib::BigEndian2Int(substr($header_string, $lame_tag_offset_contant + 0xA7, 4))) / 8388608);

    735. 

  735.                         } else {

    736. 

  736.                             // LAME 3.94a15 and earlier - 32-bit floating point

    737. 

  737.                             // Actually 3.94a16 will fall in here too and be WRONG, but is hard to detect 3.94a16 vs 3.94a15

    738. 

  738.                             $thisfile_mpeg_audio_lame_rgad['peak_amplitude'] = getid3_lib::LittleEndian2Float(substr($header_string, $lame_tag_offset_contant + 0xA7, 4));

    739. 

  739.                         }

    740. 

  740.                         if ($thisfile_mpeg_audio_lame_rgad['peak_amplitude'] == 0) {

    741. 

  741.                             unset($thisfile_mpeg_audio_lame_rgad['peak_amplitude']);

    742. 

  742.                         } else {

    743. 

  743.                             $thisfile_mpeg_audio_lame_rgad['peak_db'] = 20 * log10($thisfile_mpeg_audio_lame_rgad['peak_amplitude']);

    744. 

  744.                         }

    745. 

  745. 

    746. 

  746.                         $thisfile_mpeg_audio_lame_raw['RGAD_track']      =   getid3_lib::BigEndian2Int(substr($header_string, $lame_tag_offset_contant + 0xAB, 2));

    747. 

  747.                         $thisfile_mpeg_audio_lame_raw['RGAD_album']      =   getid3_lib::BigEndian2Int(substr($header_string, $lame_tag_offset_contant + 0xAD, 2));

    748. 

  748. 

    749. 

  749. 

    750. 

  750.                         if ($thisfile_mpeg_audio_lame_raw['RGAD_track'] != 0) {

    751. 

  751. 

    752. 

  752.                             $thisfile_mpeg_audio_lame_rgad_track['raw']['name']        = ($thisfile_mpeg_audio_lame_raw['RGAD_track'] & 0xE000) >> 13;

    753. 

  753.                             $thisfile_mpeg_audio_lame_rgad_track['raw']['originator']  = ($thisfile_mpeg_audio_lame_raw['RGAD_track'] & 0x1C00) >> 10;

    754. 

  754.                             $thisfile_mpeg_audio_lame_rgad_track['raw']['sign_bit']    = ($thisfile_mpeg_audio_lame_raw['RGAD_track'] & 0x0200) >> 9;

    755. 

  755.                             $thisfile_mpeg_audio_lame_rgad_track['raw']['gain_adjust'] =  $thisfile_mpeg_audio_lame_raw['RGAD_track'] & 0x01FF;

    756. 

  756.                             $thisfile_mpeg_audio_lame_rgad_track['name']       = getid3_lib_replaygain::NameLookup($thisfile_mpeg_audio_lame_rgad_track['raw']['name']);

    757. 

  757.                             $thisfile_mpeg_audio_lame_rgad_track['originator'] = getid3_lib_replaygain::OriginatorLookup($thisfile_mpeg_audio_lame_rgad_track['raw']['originator']);

    758. 

  758.                             $thisfile_mpeg_audio_lame_rgad_track['gain_db']    = getid3_lib_replaygain::AdjustmentLookup($thisfile_mpeg_audio_lame_rgad_track['raw']['gain_adjust'], $thisfile_mpeg_audio_lame_rgad_track['raw']['sign_bit']);

    759. 

  759. 

    760. 

  760.                             if (!empty($thisfile_mpeg_audio_lame_rgad['peak_amplitude'])) {

    761. 

  761.                                 $info['replay_gain']['track']['peak']   = $thisfile_mpeg_audio_lame_rgad['peak_amplitude'];

    762. 

  762.                             }

    763. 

  763.                             $info['replay_gain']['track']['originator'] = $thisfile_mpeg_audio_lame_rgad_track['originator'];

    764. 

  764.                             $info['replay_gain']['track']['adjustment'] = $thisfile_mpeg_audio_lame_rgad_track['gain_db'];

    765. 

  765.                         } else {

    766. 

  766.                             unset($thisfile_mpeg_audio_lame_rgad['track']);

    767. 

  767.                         }

    768. 

  768.                         if ($thisfile_mpeg_audio_lame_raw['RGAD_album'] != 0) {

    769. 

  769. 

    770. 

  770.                             $thisfile_mpeg_audio_lame_rgad_album['raw']['name']        = ($thisfile_mpeg_audio_lame_raw['RGAD_album'] & 0xE000) >> 13;

    771. 

  771.                             $thisfile_mpeg_audio_lame_rgad_album['raw']['originator']  = ($thisfile_mpeg_audio_lame_raw['RGAD_album'] & 0x1C00) >> 10;

    772. 

  772.                             $thisfile_mpeg_audio_lame_rgad_album['raw']['sign_bit']    = ($thisfile_mpeg_audio_lame_raw['RGAD_album'] & 0x0200) >> 9;

    773. 

  773.                             $thisfile_mpeg_audio_lame_rgad_album['raw']['gain_adjust'] =  $thisfile_mpeg_audio_lame_raw['RGAD_album'] & 0x01FF;

    774. 

  774.                             $thisfile_mpeg_audio_lame_rgad_album['name']       = getid3_lib_replaygain::NameLookup($thisfile_mpeg_audio_lame_rgad_album['raw']['name']);

    775. 

  775.                             $thisfile_mpeg_audio_lame_rgad_album['originator'] = getid3_lib_replaygain::OriginatorLookup($thisfile_mpeg_audio_lame_rgad_album['raw']['originator']);

    776. 

  776.                             $thisfile_mpeg_audio_lame_rgad_album['gain_db']    = getid3_lib_replaygain::Ad…
    777.

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