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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 
    

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

    777. 

  777. 

    778. 

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

    779. 

  779.                                 $info['replay_gain']['album']['peak']   = $thisfile_mpeg_audio_lame_rgad['peak_amplitude'];

    780. 

  780.                             }

    781. 

  781.                             $info['replay_gain']['album']['originator'] = $thisfile_mpeg_audio_lame_rgad_album['originator'];

    782. 

  782.                             $info['replay_gain']['album']['adjustment'] = $thisfile_mpeg_audio_lame_rgad_album['gain_db'];

    783. 

  783.                         } else {

    784. 

  784.                             unset($thisfile_mpeg_audio_lame_rgad['album']);

    785. 

  785.                         }

    786. 

  786.                         if (empty($thisfile_mpeg_audio_lame_rgad)) {

    787. 

  787.                             unset($thisfile_mpeg_audio_lame['RGAD']);

    788. 

  788.                         }

    789. 

  789. 

    790. 

  790. 

    791. 

  791.                         // byte $AF  Encoding flags + ATH Type

    792. 

  792.                         $encoding_flags_ath_type = getid3_lib::BigEndian2Int(substr($header_string, $lame_tag_offset_contant + 0xAF, 1));

    793. 

  793.                         $thisfile_mpeg_audio_lame['encoding_flags']['nspsytune']   = (bool) ($encoding_flags_ath_type & 0x10);

    794. 

  794.                         $thisfile_mpeg_audio_lame['encoding_flags']['nssafejoint'] = (bool) ($encoding_flags_ath_type & 0x20);

    795. 

  795.                         $thisfile_mpeg_audio_lame['encoding_flags']['nogap_next']  = (bool) ($encoding_flags_ath_type & 0x40);

    796. 

  796.                         $thisfile_mpeg_audio_lame['encoding_flags']['nogap_prev']  = (bool) ($encoding_flags_ath_type & 0x80);

    797. 

  797.                         $thisfile_mpeg_audio_lame['ath_type']                      =         $encoding_flags_ath_type & 0x0F;

    798. 

  798. 

    799. 

  799.                         // byte $B0  if ABR {specified bitrate} else {minimal bitrate}

    800. 

  800.                         $thisfile_mpeg_audio_lame['raw']['abrbitrate_minbitrate'] = getid3_lib::BigEndian2Int(substr($header_string, $lame_tag_offset_contant + 0xB0, 1));

    801. 

  801.                         if ($thisfile_mpeg_audio_lame_raw['vbr_method'] == 2) { // Average BitRate (ABR)

    802. 

  802.                             $thisfile_mpeg_audio_lame['bitrate_abr'] = $thisfile_mpeg_audio_lame['raw']['abrbitrate_minbitrate'];

    803. 

  803.                         } elseif ($thisfile_mpeg_audio_lame_raw['vbr_method'] == 1) { // Constant BitRate (CBR)

    804. 

  804.                             // ignore

    805. 

  805.                         } elseif ($thisfile_mpeg_audio_lame['raw']['abrbitrate_minbitrate'] > 0) { // Variable BitRate (VBR) - minimum bitrate

    806. 

  806.                             $thisfile_mpeg_audio_lame['bitrate_min'] = $thisfile_mpeg_audio_lame['raw']['abrbitrate_minbitrate'];

    807. 

  807.                         }

    808. 

  808. 

    809. 

  809.                         // bytes $B1-$B3  Encoder delays

    810. 

  810.                         $encoder_delays = getid3_lib::BigEndian2Int(substr($header_string, $lame_tag_offset_contant + 0xB1, 3));

    811. 

  811.                         $thisfile_mpeg_audio_lame['encoder_delay'] = ($encoder_delays & 0xFFF000) >> 12;

    812. 

  812.                         $thisfile_mpeg_audio_lame['end_padding']   =  $encoder_delays & 0x000FFF;

    813. 

  813. 

    814. 

  814.                         // byte $B4  Misc

    815. 

  815.                         $misc_byte = getid3_lib::BigEndian2Int(substr($header_string, $lame_tag_offset_contant + 0xB4, 1));

    816. 

  816.                         $thisfile_mpeg_audio_lame_raw['noise_shaping']       = ($misc_byte & 0x03);

    817. 

  817.                         $thisfile_mpeg_audio_lame_raw['stereo_mode']         = ($misc_byte & 0x1C) >> 2;

    818. 

  818.                         $thisfile_mpeg_audio_lame_raw['not_optimal_quality'] = ($misc_byte & 0x20) >> 5;

    819. 

  819.                         $thisfile_mpeg_audio_lame_raw['source_sample_freq']  = ($misc_byte & 0xC0) >> 6;

    820. 

  820.                         $thisfile_mpeg_audio_lame['noise_shaping']           = $thisfile_mpeg_audio_lame_raw['noise_shaping'];

    821. 

  821.                         $thisfile_mpeg_audio_lame['stereo_mode']             = getid3_mp3::LAMEmiscStereoModeLookup($thisfile_mpeg_audio_lame_raw['stereo_mode']);

    822. 

  822.                         $thisfile_mpeg_audio_lame['not_optimal_quality']     = (bool) $thisfile_mpeg_audio_lame_raw['not_optimal_quality'];

    823. 

  823.                         $thisfile_mpeg_audio_lame['source_sample_freq']      = getid3_mp3::LAMEmiscSourceSampleFrequencyLookup($thisfile_mpeg_audio_lame_raw['source_sample_freq']);

    824. 

  824. 

    825. 

  825.                         // byte $B5  MP3 Gain

    826. 

  826.                         $thisfile_mpeg_audio_lame_raw['mp3_gain']   = getid3_lib::BigEndian2Int(substr($header_string, $lame_tag_offset_contant + 0xB5, 1), false, true);

    827. 

  827.                         $thisfile_mpeg_audio_lame['mp3_gain_db']     = (20 * log10(2) / 4) * $thisfile_mpeg_audio_lame_raw['mp3_gain'];

    828. 

  828.                         $thisfile_mpeg_audio_lame['mp3_gain_factor'] = pow(2, ($thisfile_mpeg_audio_lame['mp3_gain_db'] / 6));

    829. 

  829. 

    830. 

  830.                         // bytes $B6-$B7  Preset and surround info

    831. 

  831.                         $PresetSurroundBytes = getid3_lib::BigEndian2Int(substr($header_string, $lame_tag_offset_contant + 0xB6, 2));

    832. 

  832.                         // Reserved                                                    = ($PresetSurroundBytes & 0xC000);

    833. 

  833.                         $thisfile_mpeg_audio_lame_raw['surround_info'] = ($PresetSurroundBytes & 0x3800);

    834. 

  834.                         $thisfile_mpeg_audio_lame['surround_info']     = getid3_mp3::LAMEsurroundInfoLookup($thisfile_mpeg_audio_lame_raw['surround_info']);

    835. 

  835.                         $thisfile_mpeg_audio_lame['preset_used_id']    = ($PresetSurroundBytes & 0x07FF);

    836. 

  836.                         $thisfile_mpeg_audio_lame['preset_used']       = getid3_mp3::LAMEpresetUsedLookup($thisfile_mpeg_audio_lame);

    837. 

  837.                         if (!empty($thisfile_mpeg_audio_lame['preset_used_id']) && empty($thisfile_mpeg_audio_lame['preset_used'])) {

    838. 

  838.                             $this->getid3->warning('Unknown LAME preset used ('.$thisfile_mpeg_audio_lame['preset_used_id'].') - please report to info@getid3.org');

    839. 

  839.                         }

    840. 

  840.                         if (($thisfile_mpeg_audio_lame['short_version'] == 'LAME3.90.') && !empty($thisfile_mpeg_audio_lame['preset_used_id'])) {

    841. 

  841.                             // this may change if 3.90.4 ever comes out

    842. 

  842.                             $thisfile_mpeg_audio_lame['short_version'] = 'LAME3.90.3';

    843. 

  843.                         }

    844. 

  844. 

    845. 

  845.                         // bytes $B8-$BB  MusicLength

    846. 

  846.                         $thisfile_mpeg_audio_lame['audio_bytes'] = getid3_lib::BigEndian2Int(substr($header_string, $lame_tag_offset_contant + 0xB8, 4));

    847. 

  847.                         $expected_number_of_audio_bytes = (($thisfile_mpeg_audio_lame['audio_bytes'] > 0) ? $thisfile_mpeg_audio_lame['audio_bytes'] : $thisfile_mpeg_audio['VBR_bytes']);

    848. 

  848. 

    849. 

  849.                         // bytes $BC-$BD  MusicCRC

    850. 

  850.                         $thisfile_mpeg_audio_lame['music_crc']    = getid3_lib::BigEndian2Int(substr($header_string, $lame_tag_offset_contant + 0xBC, 2));

    851. 

  851. 

    852. 

  852.                         // bytes $BE-$BF  CRC-16 of Info Tag

    853. 

  853.                         $thisfile_mpeg_audio_lame['lame_tag_crc'] = getid3_lib::BigEndian2Int(substr($header_string, $lame_tag_offset_contant + 0xBE, 2));

    854. 

  854. 

    855. 

  855. 

    856. 

  856.                         // LAME CBR

    857. 

  857.                         if ($thisfile_mpeg_audio_lame_raw['vbr_method'] == 1) {

    858. 

  858. 

    859. 

  859.                             $thisfile_mpeg_audio['bitrate_mode'] = 'cbr';

    860. 

  860.                             $thisfile_mpeg_audio['bitrate'] = getid3_mp3::ClosestStandardMP3Bitrate($thisfile_mpeg_audio['bitrate']);

    861. 

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

    862. 

  862. 

    863. 

  863.                         }

    864. 

  864. 

    865. 

  865.                     }

    866. 

  866.                 }

    867. 

  867. 

    868. 

  868.             } else {

    869. 

  869. 

    870. 

  870.                 // not Fraunhofer or Xing VBR methods, most likely CBR (but could be VBR with no header)

    871. 

  871.                 $thisfile_mpeg_audio['bitrate_mode'] = 'cbr';

    872. 

  872.                 if ($recursive_search) {

    873. 

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

    874. 

  874.                     if (getid3_mp3::RecursiveFrameScanning($fd, $info, $offset, $next_frame_test_offset, true)) {

    875. 

  875.                         $recursive_search = false;

    876. 

  876.                         $thisfile_mpeg_audio['bitrate_mode'] = 'cbr';

    877. 

  877.                     }

    878. 

  878.                     if ($thisfile_mpeg_audio['bitrate_mode'] == 'vbr') {

    879. 

  879.                         $this->getid3->warning('VBR file with no VBR header. Bitrate values calculated from actual frame bitrates.');

    880. 

  880.                     }

    881. 

  881.                 }

    882. 

  882. 

    883. 

  883.             }

    884. 

  884. 

    885. 

  885.         }

    886. 

  886. 

    887. 

  887.         if (($expected_number_of_audio_bytes > 0) && ($expected_number_of_audio_bytes != ($info['avdataend'] - $info['avdataoffset']))) {

    888. 

  888.             if ($expected_number_of_audio_bytes > ($info['avdataend'] - $info['avdataoffset'])) {

    889. 

  889.                 if (($expected_number_of_audio_bytes - ($info['avdataend'] - $info['avdataoffset'])) == 1) {

    890. 

  890.                     $this->getid3->warning('Last byte of data truncated (this is a known bug in Meracl ID3 Tag Writer before v1.3.5)');

    891. 

  891.                 } else {

    892. 

  892.                     $this->getid3->warning('Probable truncated file: expecting '.$expected_number_of_audio_bytes.' bytes of audio data, only found '.($info['avdataend'] - $info['avdataoffset']).' (short by '.($expected_number_of_audio_bytes - ($info['avdataend'] - $info['avdataoffset'])).' bytes)');

    893. 

  893.                 }

    894. 

  894.             } else {

    895. 

  895.                 if ((($info['avdataend'] - $info['avdataoffset']) - $expected_number_of_audio_bytes) == 1) {

    896. 

  896.                         $info['avdataend']--;

    897. 

  897.                 } else {

    898. 

  898.                     $this->getid3->warning('Too much data in file: expecting '.$expected_number_of_audio_bytes.' bytes of audio data, found '.($info['avdataend'] - $info['avdataoffset']).' ('.(($info['avdataend'] - $info['avdataoffset']) - $expected_number_of_audio_bytes).' bytes too many)');

    899. 

  899.                 }

    900. 

  900.             }

    901. 

  901.         }

    902. 

  902. 

    903. 

  903.         if (($thisfile_mpeg_audio['bitrate'] == 'free') && empty($info['audio']['bitrate'])) {

    904. 

  904.             if (($offset == $info['avdataoffset']) && empty($thisfile_mpeg_audio['VBR_frames'])) {

    905. 

  905.                 $frame_byte_length = getid3_mp3::FreeFormatFrameLength($fd, $offset, $info, true);

    906. 

  906.                 if ($frame_byte_length > 0) {

    907. 

  907.                     $thisfile_mpeg_audio['framelength'] = $frame_byte_length;

    908. 

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

    909. 

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

    910. 

  910.                         $info['audio']['bitrate'] = ((($frame_byte_length / 4) - intval($thisfile_mpeg_audio['padding'])) * $thisfile_mpeg_audio['sample_rate']) / 12;

    911. 

  911.                     } else {

    912. 

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

    913. 

  913.                         $info['audio']['bitrate'] = (($frame_byte_length - intval($thisfile_mpeg_audio['padding'])) * $thisfile_mpeg_audio['sample_rate']) / 144;

    914. 

  914.                     }

    915. 

  915.                 } else {

    916. 

  916.                     

    917. 

  917.                     // non-fatal error: Error calculating frame length of free-format MP3 without Xing/LAME header.

    918. 

  918.                     return;

    919. 

  919.                 }

    920. 

  920.             }

    921. 

  921.         }

    922. 

  922. 

    923. 

  923.         if (@$thisfile_mpeg_audio['VBR_frames']) {

    924. 

  924.             switch ($thisfile_mpeg_audio['bitrate_mode']) {

    925. 

  925.                 case 'vbr':

    926. 

  926.                 case 'abr':

    927. 

  927.                     if (($thisfile_mpeg_audio['version'] == '1') && ($thisfile_mpeg_audio['layer'] == 1)) {

    928. 

  928.                         $thisfile_mpeg_audio['VBR_bitrate'] = ((@$thisfile_mpeg_audio['VBR_bytes'] / $thisfile_mpeg_audio['VBR_frames']) * 8) * ($info['audio']['sample_rate'] / 384);

    929. 

  929.                     } elseif ((($thisfile_mpeg_audio['version'] == '2') || ($thisfile_mpeg_audio['version'] == '2.5')) && ($thisfile_mpeg_audio['layer'] == 3)) {

    930. 

  930.                         $thisfile_mpeg_audio['VBR_bitrate'] = ((@$thisfile_mpeg_audio['VBR_bytes'] / $thisfile_mpeg_audio['VBR_frames']) * 8) * ($info['audio']['sample_rate'] / 576);

    931. 

  931.                     } else {

    932. 

  932.                         $thisfile_mpeg_audio['VBR_bitrate'] = ((@$thisfile_mpeg_audio['VBR_bytes'] / $thisfile_mpeg_audio['VBR_frames']) * 8) * ($info['audio']['sample_rate'] / 1152);

    933. 

  933.                     }

    934. 

  934.                     if ($thisfile_mpeg_audio['VBR_bitrate'] > 0) {

    935. 

  935.                         $info['audio']['bitrate']         = $thisfile_mpeg_audio['VBR_bitrate'];

    936. 

  936.                         $thisfile_mpeg_audio['bitrate'] = $thisfile_mpeg_audio['VBR_bitrate']; // to avoid confusion

    937. 

  937.                     }

    938. 

  938.                     break;

    939. 

  939.             }

    940. 

  940.         }

    941. 

  941. 

    942. 

  942.         // End variable-bitrate headers

    943. 

  943.         ////////////////////////////////////////////////////////////////////////////////////

    944. 

  944. 

    945. 

  945.         if ($recursive_search) {

    946. 

  946. 

    947. 

  947.             if (!getid3_mp3::RecursiveFrameScanning($fd, $info, $offset, $next_frame_test_offset, $scan_as_cbr)) {

    948. 

  948.                 return false;

    949. 

  949.             }

    950. 

  950. 

    951. 

  951.         }

    952. 

  952. 

    953. 

  953.         return true;

    954. 

  954.     }

    955. 

  955. 

    956. 

  956.     

    957. 

  957.     

    958. 

  958.     public function RecursiveFrameScanning(&$fd, &$info, &$offset, &$next_frame_test_offset, $scan_as_cbr) {

    959. 

  959.         for ($i = 0; $i < getid3_mp3::VALID_CHECK_FRAMES; $i++) {

    960. 

  960.             // check next getid3_mp3::VALID_CHECK_FRAMES frames for validity, to make sure we haven't run across a false synch

    961. 

  961.             if (($next_frame_test_offset + 4) >= $info['avdataend']) {

    962. 

  962.                 // end of file

    963. 

  963.                 return true;

    964. 

  964.             }

    965. 

  965. 

    966. 

  966.             $next_frame_test_array = array ('avdataend' => $info['avdataend'], 'avdataoffset' => $info['avdataoffset']);

    967. 

  967.             if ($this->decodeMPEGaudioHeader($fd, $next_frame_test_offset, $next_frame_test_array, false)) {

    968. 

  968.                 if ($scan_as_cbr) {

    969. 

  969.                     // force CBR mode, used for trying to pick out invalid audio streams with

    970. 

  970.                     // valid(?) VBR headers, or VBR streams with no VBR header

    971. 

  971.                     if (!isset($next_frame_test_array['mpeg']['audio']['bitrate']) || !isset($info['mpeg']['audio']['bitrate']) || ($next_frame_test_array['mpeg']['audio']['bitrate'] != $info['mpeg']['audio']['bitrate'])) {

    972. 

  972.                         return false;

    973. 

  973.                     }

    974. 

  974.                 }

    975. 

  975. 

    976. 

  976. 

    977. 

  977.                 // next frame is OK, get ready to check the one after that

    978. 

  978.                 if (isset($next_frame_test_array['mpeg']['audio']['framelength']) && ($next_frame_test_array['mpeg']['audio']['framelength'] > 0)) {

    979. 

  979.                     $next_frame_test_offset += $next_frame_test_array['mpeg']['audio']['framelength'];

    980. 

  980.                 } else {

    981. 

  981.                     

    982. 

  982.                     // non-fatal error: Frame at offset $offset has an invalid frame length.

    983. 

  983.                     return;

    984. 

  984.                 }

    985. 

  985. 

    986. 

  986.             } else {

    987. 

  987. 

    988. 

  988.                 // non-fatal error: Next frame is not valid.

    989. 

  989.                 return;

    990. 

  990.             }

    991. 

  991.         }

    992. 

  992.         return true;

    993. 

  993.     }

    994. 

  994. 

    995. 

  995.     

    996. 

  996.     

    997. 

  997.     public function FreeFormatFrameLength($fd, $offset, &$info, $deep_scan=false) {

    998. 

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

    999. 

  999.         $mpeg_audio_data = fread($fd, 32768);

    1000. 

  1000. 

    1001. 

  1001.         $sync_pattern1 = substr($mpeg_audio_data, 0, 4);

    1002. 

  1002.         // may be different pattern due to padding

    1003. 

  1003.         $sync_pattern2 = $sync_pattern1{0}.$sync_pattern1{1}.chr(ord($sync_pattern1{2}) | 0x02).$sync_pattern1{3};

    1004. 

  1004.         if ($sync_pattern2 === $sync_pattern1) {

    1005. 

  1005.             $sync_pattern2 = $sync_pattern1{0}.$sync_pattern1{1}.chr(ord($sync_pattern1{2}) & 0xFD).$sync_pattern1{3};

    1006. 

  1006.         }

    1007. 

  1007. 

    1008. 

  1008.         $frame_length = false;

    1009. 

  1009.         $frame_length1 = strpos($mpeg_audio_data, $sync_pattern1, 4);

    1010. 

  1010.         $frame_length2 = strpos($mpeg_audio_data, $sync_pattern2, 4);

    1011. 

  1011.         if ($frame_length1 > 4) {

    1012. 

  1012.             $frame_length = $frame_length1;

    1013. 

  1013.         }

    1014. 

  1014.         if (($frame_length2 > 4) && ($frame_length2 < $frame_length1)) {

    1015. 

  1015.             $frame_length = $frame_length2;

    1016. 

  1016.         }

    1017. 

  1017.         if (!$frame_length) {

    1018. 

  1018. 

    1019. 

  1019.             // LAME 3.88 has a different value for modeextension on the first frame vs the rest

    1020. 

  1020.             $frame_length1 = strpos($mpeg_audio_data, substr($sync_pattern1, 0, 3), 4);

    1021. 

  1021.             $frame_length2 = strpos($mpeg_audio_data, substr($sync_pattern2, 0, 3), 4);

    1022. 

  1022. 

    1023. 

  1023.             if ($frame_length1 > 4) {

    1024. 

  1024.                 $frame_length = $frame_length1;

    1025. 

  1025.             }

    1026. 

  1026.             if (($frame_length2 > 4) && ($frame_length2 < $frame_length1)) {

    1027. 

  1027.                 $frame_length = $frame_length2;

    1028. 

  1028.             }

    1029. 

  1029.             if (!$frame_length) {

    1030. 

  1030.                 throw new getid3_exception('Cannot find next free-format synch pattern ('.getid3_lib::PrintHexBytes($sync_pattern1).' or '.getid3_lib::PrintHexBytes($sync_pattern2).') after offset '.$offset);

    1031. 

  1031.             } else {

    1032. 

  1032.                 $this->getid3->warning('ModeExtension varies between first frame and other frames (known free-format issue in LAME 3.88)');

    1033. 

  1033.                 $info['audio']['codec']   = 'LAME';

    1034. 

  1034.                 $info['audio']['encoder'] = 'LAME3.88';

    1035. 

  1035.                 $sync_pattern1 = substr($sync_pattern1, 0, 3);

    1036. 

  1036.                 $sync_pattern2 = substr($sync_pattern2, 0, 3);

    1037. 

  1037.             }

    1038. 

  1038.         }

    1039. 

  1039. 

    1040. 

  1040.         if ($deep_scan) {

    1041. 

  1041. 

    1042. 

  1042.             $actual_frame_length_values = array ();

    1043. 

  1043.             $next_offset = $offset + $frame_length;

    1044. 

  1044.             while ($next_offset < ($info['avdataend'] - 6)) {

    1045. 

  1045.                 fseek($fd, $next_offset - 1, SEEK_SET);

    1046. 

  1046.                 $NextSyncPattern = fread($fd, 6);

    1047. 

  1047.                 if ((substr($NextSyncPattern, 1, strlen($sync_pattern1)) == $sync_pattern1) || (substr($NextSyncPattern, 1, strlen($sync_pattern2)) == $sync_pattern2)) {

    1048. 

  1048.                     // good - found where expected

    1049. 

  1049.                     $actual_frame_length_values[] = $frame_length;

    1050. 

  1050.                 } elseif ((substr($NextSyncPattern, 0, strlen($sync_pattern1)) == $sync_pattern1) || (substr($NextSyncPattern, 0, strlen($sync_pattern2)) == $sync_pattern2)) {

    1051. 

  1051.                     // ok - found one byte earlier than expected (last frame wasn't padded, first frame was)

    1052. 

  1052.                     $actual_frame_length_values[] = ($frame_length - 1);

    1053. 

  1053.                     $next_offset--;

    1054. 

  1054.                 } elseif ((substr($NextSyncPattern, 2, strlen($sync_pattern1)) == $sync_pattern1) || (substr($NextSyncPattern, 2, strlen($sync_pattern2)) == $sync_pattern2)) {

    1055. 

  1055.                     // ok - found one byte later than expected (last frame was padded, first frame wasn't)

    1056. 

  1056.                     $actual_frame_length_values[] = ($frame_length + 1);

    1057. 

  1057.                     $next_offset++;

    1058. 

  1058.                 } else {

    1059. 

  1059.                     throw new getid3_exception('Did not find expected free-format sync pattern at offset '.$next_offset);

    1060. 

  1060.                 }

    1061. 

  1061.                 $next_offset += $frame_length;

    1062. 

  1062.             }

    1063. 

  1063.             if (count($actual_frame_length_values) > 0) {

    1064. 

  1064.                 $frame_length = intval(round(array_sum($actual_frame_length_values) / count($actual_frame_length_values)));

    1065. 

  1065.             }

    1066. 

  1066.         }

    1067. 

  1067.         return $frame_length;

    1068. 

  1068.     }

    1069. 

  1069. 

    1070. 

  1070.     

    1071. 

  1071. 

    1072. 

  1072.     public function getOnlyMPEGaudioInfo($fd, &$info, $avdata_offset, $bit_rate_histogram=false) {

    1073. 

  1073. 

    1074. 

  1074.         // looks for synch, decodes MPEG audio header

    1075. 

  1075.      

    1076. 

  1076.         fseek($fd, $avdata_offset, SEEK_SET);

    1077. 

  1077.         

    1078. 

  1078.         $sync_seek_buffer_size = min(128 * 1024, $info['avdataend'] - $avdata_offset);

    1079. 

  1079.         $header = fread($fd, $sync_seek_buffer_size);

    1080. 

  1080.         $sync_seek_buffer_size = strlen($header);

    1081. 

  1081.         $synch_seek_offset = 0;

    1082. 

  1082.         

    1083. 

  1083.         static $mpeg_audio_version_lookup;

    1084. 

  1084.         static $mpeg_audio_layer_lookup;

    1085. 

  1085.         static $mpeg_audio_bitrate_lookup;

    1086. 

  1086.         if (empty($mpeg_audio_version_lookup)) {

    1087. 

  1087.             $mpeg_audio_version_lookup = getid3_mp3::MPEGaudioVersionarray();

    1088. 

  1088.             $mpeg_audio_layer_lookup   = getid3_mp3::MPEGaudioLayerarray();

    1089. 

  1089.             $mpeg_audio_bitrate_lookup = getid3_mp3::MPEGaudioBitratearray();

    1090. 

  1090. 

    1091. 

  1091.         }

    1092. 

  1092. 

    1093. 

  1093.         while ($synch_seek_offset < $sync_seek_buffer_size) {

    1094. 

  1094.      

    1095. 

  1095.             if ((($avdata_offset + $synch_seek_offset)  < $info['avdataend']) && !feof($fd)) {

    1096. 

  1096.      

    1097. 

  1097.                 // if a synch's not found within the first 128k bytes, then give up               

    1098. 

  1098.                 if ($synch_seek_offset > $sync_seek_buffer_size) {

    1099. 

  1099.                     throw new getid3_exception('Could not find valid MPEG audio synch within the first '.round($sync_seek_buffer_size / 1024).'kB');

    1100. 

  1100.                 } 

    1101. 

  1101.               

    1102. 

  1102.                 if (feof($fd)) {

    1103. 

  1103.                     throw new getid3_exception('Could not find valid MPEG audio synch before end of file');

    1104. 

  1104.                 }

    1105. 

  1105.             }

    1106. 

  1106.      

    1107. 

  1107.            if (($synch_seek_offset + 1) >= strlen($header)) {

    1108. 

  1108.                 throw new getid3_exception('Could not find valid MPEG synch before end of file');

    1109. 

  1109.            }

    1110. 

  1110.      

    1111. 

  1111.            if (($header{$synch_seek_offset} == "\xFF") && ($header{($synch_seek_offset + 1)} > "\xE0")) { // synch detected 

    1112. 

  1112. 

    1113. 

  1113.                 if (!isset($first_frame_info) && !isset($info['mpeg']['audio'])) {

    1114. 

  1114.                     $first_frame_info = $info;

    1115. 

  1115.                     $first_frame_avdata_offset = $avdata_offset + $synch_seek_offset;

    1116. 

  1116.                     if (!getid3_mp3::decodeMPEGaudioHeader($fd, $avdata_offset + $synch_seek_offset, $first_frame_info, false)) {

    1117. 

  1117.                         // if this is the first valid MPEG-audio frame, save it in case it's a VBR header frame and there's

    1118. 

  1118.                         // garbage between this frame and a valid sequence of MPEG-audio frames, to be restored below

    1119. 

  1119.                         unset($first_frame_info);

    1120. 

  1120.                     }

    1121. 

  1121.                 }

    1122. 

  1122. 

    1123. 

  1123.                 $dummy = $info; // only overwrite real data if valid header found

    1124. 

  1124.                 if (getid3_mp3::decodeMPEGaudioHeader($fd, $avdata_offset + $synch_seek_offset, $dummy, true)) {

    1125. 

  1125.                     $info = $dummy;

    1126. 

  1126.                     $info['avdataoffset'] = $avdata_offset + $synch_seek_offset;

    1127. 

  1127.                     

    1128. 

  1128.                     switch (@$info['fileformat']) {

    1129. 

  1129.                         case '':

    1130. 

  1130.                         case 'mp3':

    1131. 

  1131.                             $info['fileformat']          = 'mp3';

    1132. 

  1132.                             $info['audio']['dataformat'] = 'mp3';

    1133. 

  1133.                             break;

    1134. 

  1134.                     }

    1135. 

  1135.                     if (isset($first_frame_info['mpeg']['audio']['bitrate_mode']) && ($first_frame_info['mpeg']['audio']['bitrate_mode'] == 'vbr')) {

    1136. 

  1136.                         if (!(abs($info['audio']['bitrate'] - $first_frame_info['audio']['bitrate']) <= 1)) {

    1137. 

  1137.                             // If there is garbage data between a valid VBR header frame and a sequence

    1138. 

  1138.                             // of valid MPEG-audio frames the VBR data is no longer discarded.

    1139. 

  1139.                             $info = $first_frame_info;

    1140. 

  1140.                             $info['avdataoffset']        = $first_frame_avdata_offset;

    1141. 

  1141.                             $info['fileformat']          = 'mp3';

    1142. 

  1142.                             $info['audio']['dataformat'] = 'mp3';

    1143. 

  1143.                             $dummy                               = $info;

    1144. 

  1144.                             unset($dummy['mpeg']['audio']);

    1145. 

  1145.                             $GarbageOffsetStart = $first_frame_avdata_offset + $first_frame_info['mpeg']['audio']['framelength'];

    1146. 

  1146.                             $GarbageOffsetEnd   = $avdata_offset + $synch_seek_offset;

    1147. 

  1147.                             if (getid3_mp3::decodeMPEGaudioHeader($fd, $GarbageOffsetEnd, $dummy, true, true)) {

    1148. 

  1148. 

    1149. 

  1149.                                 $info = $dummy;

    1150. 

  1150.                                 $info['avdataoffset'] = $GarbageOffsetEnd;

    1151. 

  1151.                                 $this->getid3->warning('apparently-valid VBR header not used because could not find '.getid3_mp3::VALID_CHECK_FRAMES.' consecutive MPEG-audio frames immediately after VBR header (garbage data for '.($GarbageOffsetEnd - $GarbageOffsetStart).' bytes between '.$GarbageOffsetStart.' and '.$GarbageOffsetEnd.'), but did find valid CBR stream starting at '.$GarbageOffsetEnd);

    1152. 

  1152. 

    1153. 

  1153.                             } else {

    1154. 

  1154. 

    1155. 

  1155.                                 $this->getid3->warning('using data from VBR header even though could not find '.getid3_mp3::VALID_CHECK_FRAMES.' consecutive MPEG-audio frames immediately after VBR header (garbage data for '.($GarbageOffsetEnd - $GarbageOffsetStart).' bytes between '.$GarbageOffsetStart.' and '.$GarbageOffsetEnd.')');

    1156. 

  1156. 

    1157. 

  1157.                             }

    1158. 

  1158.                         }

    1159. 

  1159.                     }

    1160. 

  1160.                     if (isset($info['mpeg']['audio']['bitrate_mode']) && ($info['mpeg']['audio']['bitrate_mode'] == 'vbr') && !isset($info['mpeg']['audio']['VBR_method'])) {

    1161. 

  1161.                         // VBR file with no VBR header

    1162. 

  1162.                         $bit_rate_histogram = true;

    1163. 

  1163.                     }

    1164. 

  1164. 

    1165. 

  1165.                     if ($bit_rate_histogram) {

    1166. 

  1166. 

    1167. 

  1167.                         $info['mpeg']['audio']['stereo_distribution']  = array ('stereo'=>0, 'joint stereo'=>0, 'dual channel'=>0, 'mono'=>0);

    1168. 

  1168.                         $info['mpeg']['audio']['version_distribution'] = array ('1'=>0, '2'=>0, '2.5'=>0);

    1169. 

  1169. 

    1170. 

  1170.                         if ($info['mpeg']['audio']['version'] == '1') {

    1171. 

  1171.                             if ($info['mpeg']['audio']['layer'] == 3) {

    1172. 

  1172.                                 $info['mpeg']['audio']['bitrate_distribution'] = array ('free'=>0, 32000=>0, 40000=>0, 48000=>0, 56000=>0, 64000=>0, 80000=>0, 96000=>0, 112000=>0, 128000=>0, 160000=>0, 192000=>0, 224000=>0, 256000=>0, 320000=>0);

    1173. 

  1173.                             } elseif ($info['mpeg']['audio']['layer'] == 2) {

    1174. 

  1174.                                 $info['mpeg']['audio']['bitrate_distribution'] = array ('free'=>0, 32000=>0, 48000=>0, 56000=>0, 64000=>0, 80000=>0, 96000=>0, 112000=>0, 128000=>0, 160000=>0, 192000=>0, 224000=>0, 256000=>0, 320000=>0, 384000=>0);

    1175. 

  1175.                             } elseif ($info['mpeg']['audio']['layer'] == 1) {

    1176. 

  1176.                                 $info['mpeg']['audio']['bitrate_distribution'] = array ('free'=>0, 32000=>0, 64000=>0, 96000=>0, 128000=>0, 160000=>0, 192000=>0, 224000=>0, 256000=>0, 288000=>0, 320000=>0, 352000=>0, 384000=>0, 416000=>0, 448000=>0);

    1177. 

  1177.                             }

    1178. 

  1178.                         } elseif ($info['mpeg']['audio']['layer'] == 1) {

    1179. 

  1179.                             $info['mpeg']['audio']['bitrate_distribution'] = array ('free'=>0, 32000=>0, 48000=>0, 56000=>0, 64000=>0, 80000=>0, 96000=>0, 112000=>0, 128000=>0, 144000=>0, 160000=>0, 176000=>0, 192000=>0, 224000=>0, 256000=>0);

    1180. 

  1180.                         } else {

    1181. 

  1181.                             $info['mpeg']['audio']['bitrate_distribution'] = array ('free'=>0, 8000=>0, 16000=>0, 24000=>0, 32000=>0, 40000=>0, 48000=>0, 56000=>0, 64000=>0, 80000=>0, 96000=>0, 112000=>0, 128000=>0, 144000=>0, 160000=>0);

    1182. 

  1182.                         }

    1183. 

  1183. 

    1184. 

  1184.                         $dummy = array ('avdataend' => $info['avdataend'], 'avdataoffset' => $info['avdataoffset']);

    1185. 

  1185.                         $synch_start_offset = $info['avdataoffset'];

    1186. 

  1186. 

    1187. 

  1187.                         $fast_mode = false;

    1188. 

  1188.                         $synch_errors_found = 0;

    1189. 

  1189.                         while ($this->decodeMPEGaudioHeader($fd, $synch_start_offset, $dummy, false, false, $fast_mode)) {

    1190. 

  1190.                             $fast_mode = true;

    1191. 

  1191.                             $thisframebitrate = $mpeg_audio_bitrate_lookup[$mpeg_audio_version_lookup[$dummy['mpeg']['audio']['raw']['version']]][$mpeg_audio_layer_lookup[$dummy['mpeg']['audio']['raw']['layer']]][$dummy['mpeg']['audio']['raw']['bitrate']];

    1192. 

  1192. 

    1193. 

  1193.                             if (empty($dummy['mpeg']['audio']['framelength'])) {

    1194. 

  1194.                                 $synch_errors_found++;

    1195. 

  1195.                             } 

    1196. 

  1196.                             else {

    1197. 

  1197.                                 @$info['mpeg']['audio']['bitrate_distribution'][$thisframebitrate]++;

    1198. 

  1198.                                 @$info['mpeg']['audio']['stereo_distribution'][$dummy['mpeg']['audio']['channelmode']]++;

    1199. 

  1199.                                 @$info['mpeg']['audio']['version_distribution'][$dummy['mpeg']['audio']['version']]++;

    1200. 

  1200. 

    1201. 

  1201.                                 $synch_start_offset += $dummy['mpeg']['audio']['framelength'];

    1202. 

  1202.                             }

    1203. 

  1203.                         }

    1204. 

  1204.                         if ($synch_errors_found > 0) {

    1205. 

  1205.                             $this->getid3->warning('Found '.$synch_errors_found.' synch errors in histogram analysis');

    1206. 

  1206.                         }

    1207. 

  1207. 

    1208. 

  1208.                         $bit_total     = 0;

    1209. 

  1209.                         $frame_counter = 0;

    1210. 

  1210.                         foreach ($info['mpeg']['audio']['bitrate_distribution'] as $bit_rate_value => $bit_rate_count) {

    1211. 

  1211.                             $frame_counter += $bit_rate_count;

    1212. 

  1212.                             if ($bit_rate_value != 'free') {

    1213. 

  1213.                                 $bit_total += ($bit_rate_value * $bit_rate_count);

    1214. 

  1214.                             }

    1215. 

  1215.                         }

    1216. 

  1216.                         if ($frame_counter == 0) {

    1217. 

  1217.                             throw new getid3_exception('Corrupt MP3 file: framecounter == zero');

    1218. 

  1218.                         }

    1219. 

  1219.                         $info['mpeg']['audio']['frame_count'] = $frame_counter;

    1220. 

  1220.                         $info['mpeg']['audio']['bitrate']     = ($bit_total / $frame_counter);

    1221. 

  1221. 

    1222. 

  1222.                         $info['audio']['bitrate'] = $info['mpeg']['audio']['bitrate'];

    1223. 

  1223. 

    1224. 

  1224. 

    1225. 

  1225.                         // Definitively set VBR vs CBR, even if the Xing/LAME/VBRI header says differently

    1226. 

  1226.                         $distinct_bit_rates = 0;

    1227. 

  1227.                         foreach ($info['mpeg']['audio']['bitrate_distribution'] as $bit_rate_value => $bit_rate_count) {

    1228. 

  1228.                             if ($bit_rate_count > 0) {

    1229. 

  1229.                                 $distinct_bit_rates++;

    1230. 

  1230.                             }

    1231. 

  1231.                         }

    1232. 

  1232.                         if ($distinct_bit_rates > 1) {

    1233. 

  1233.                             $info['mpeg']['audio']['bitrate_mode'] = 'vbr';

    1234. 

  1234.                         } else {

    1235. 

  1235.                             $info['mpeg']['audio']['bitrate_mode'] = 'cbr';

    1236. 

  1236.                         }

    1237. 

  1237.                         $info['audio']['bitrate_mode'] = $info['mpeg']['audio']['bitrate_mode'];

    1238. 

  1238. 

    1239. 

  1239.                     }

    1240. 

  1240. 

    1241. 

  1241.                     break; // exit while()

    1242. 

  1242.                 }

    1243. 

  1243.             }

    1244. 

  1244. 

    1245. 

  1245.             $synch_seek_offset++;

    1246. 

  1246.             if (($avdata_offset + $synch_seek_offset) >= $info['avdataend']) {

    1247. 

  1247.                 // end of file/data

    1248. 

  1248. 

    1249. 

  1249.                 if (empty($info['mpeg']['audio'])) {

    1250. 

  1250. 

    1251. 

  1251.                     throw new getid3_exception('could not find valid MPEG synch before end of file');

    1252. 

  1252.                 }

    1253. 

  1253.                 break;

    1254. 

  1254.             }

    1255. 

  1255. 

    1256. 

  1256.         }

    1257. 

  1257.         

    1258. 

  1258.         $info['audio']['channels']        = $info['mpeg']['audio']['channels'];

    1259. 

  1259.         $info['audio']['channelmode']     = $info['mpeg']['audio']['channelmode'];

    1260. 

  1260.         $info['audio']['sample_rate']     = $info['mpeg']['audio']['sample_rate'];

    1261. 

  1261.         return true;

    1262. 

  1262.     }

    1263. 

  1263. 

    1264. 

  1264. 

    1265. 

  1265. 

    1266. 

  1266.     public static function MPEGaudioVersionarray() {

    1267. 

  1267.         

    1268. 

  1268.         static $array = array ('2.5', false, '2', '1');

    1269. 

  1269.         return $array;

    1270. 

  1270.     }

    1271. 

  1271. 

    1272. 

  1272. 

    1273. 

  1273. 

    1274. 

  1274.     public static function MPEGaudioLayerarray() {

    1275. 

  1275.         

    1276. 

  1276.         static $array = array (false, 3, 2, 1);

    1277. 

  1277.         return $array;

    1278. 

  1278.     }

    1279. 

  1279. 

    1280. 

  1280. 

    1281. 

  1281. 

    1282. 

  1282.     public static function MPEGaudioBitratearray() {

    1283. 

  1283.         

    1284. 

  1284.         static $array;

    1285. 

  1285.         if (empty($array)) {

    1286. 

  1286.             $array = array (

    1287. 

  1287.                 '1'  =>  array (1 => array ('free', 32000, 64000, 96000, 128000, 160000, 192000, 224000, 256000, 288000, 320000, 352000, 384000, 416000, 448000),

    1288. 

  1288.                                 2 => array ('free', 32000, 48000, 56000,  64000,  80000,  96000, 112000, 128000, 160000, 192000, 224000, 256000, 320000, 384000),

    1289. 

  1289.                                 3 => array ('free', 32000, 40000, 48000,  56000,  64000,  80000,  96000, 112000, 128000, 160000, 192000, 224000, 256000, 320000)

    1290. 

  1290.                                ),

    1291. 

  1291. 

    1292. 

  1292.                 '2'  =>  array (1 => array ('free', 32000, 48000, 56000,  64000,  80000,  96000, 112000, 128000, 144000, 160000, 176000, 192000, 224000, 256000),

    1293. 

  1293.                                 2 => array ('free',  8000, 16000, 24000,  32000,  40000,  48000,  56000,  64000,  80000,  96000, 112000, 128000, 144000, 160000),

    1294. 

  1294.                                )

    1295. 

  1295.             );

    1296. 

  1296.             $array['2'][3] = $array['2'][2];

    1297. 

  1297.             $array['2.5']  = $array['2'];

    1298. 

  1298.         }

    1299. 

  1299.         return $array;

    1300. 

  1300.     }

    1301. 

  1301. 

    1302. 

  1302. 

    1303. 

  1303. 

    1304. 

  1304.     public static function MPEGaudioFrequencyarray() {

    1305. 

  1305.         

    1306. 

  1306.         static $array = array (

    1307. 

  1307.                 '1'   => array (44100, 48000, 32000),

    1308. 

  1308.                 '2'   => array (22050, 24000, 16000),

    1309. 

  1309.                 '2.5' => array (11025, 12000,  8000)

    1310. 

  1310.         );

    1311. 

  1311.         return $array;

    1312. 

  1312.     }

    1313. 

  1313. 

    1314. 

  1314. 

    1315. 

  1315. 

    1316. 

  1316.     public static function MPEGaudioChannelModearray() {

    1317. 

  1317.         

    1318. 

  1318.         static $array = array ('stereo', 'joint stereo', 'dual channel', 'mono');

    1319. 

  1319.         return $array;

    1320. 

  1320.     }

    1321. 

  1321. 

    1322. 

  1322. 

    1323. 

  1323. 

    1324. 

  1324.     public static function MPEGaudioModeExtensionarray() {

    1325. 

  1325.         

    1326. 

  1326.         static $array = array (

    1327. 

  1327.                 1 => array ('4-31', '8-31', '12-31', '16-31'),

    1328. 

  1328.                 2 => array ('4-31', '8-31', '12-31', '16-31'),

    1329. 

  1329.                 3 => array ('', 'IS', 'MS', 'IS+MS')

    1330. 

  1330.         );

    1331. 

  1331.         return $array;

    1332. 

  1332.     }

    1333. 

  1333. 

    1334. 

  1334. 

    1335. 

  1335. 

    1336. 

  1336.     public static function MPEGaudioEmphasisarray() {

    1337. 

  1337.         

    1338. 

  1338.         static $array = array ('none', '50/15ms', false, 'CCIT J.17');

    1339. 

  1339.         return $array;

    1340. 

  1340.     }

    1341. 

  1341. 

    1342. 

  1342. 

    1343. 

  1343. 

    1344. 

  1344.     public static function MPEGaudioHeaderBytesValid($head4, $allow_bitrate_15=false) {

    1345. 

  1345.         

    1346. 

  1346.         return getid3_mp3::MPEGaudioHeaderValid(getid3_mp3::MPEGaudioHeaderDecode($head4), false, $allow_bitrate_15);

    1347. 

  1347.     }

    1348. 

  1348. 

    1349. 

  1349. 

    1350. 

  1350. 

    1351. 

  1351.     public static function MPEGaudioHeaderValid($raw_array, $echo_errors=false, $allow_bitrate_15=false) {

    1352. 

  1352.         

    1353. 

  1353.         if (($raw_array['synch'] & 0x0FFE) != 0x0FFE) {

    1354. 

  1354.             return false;

    1355. 

  1355.         }

    1356. 

  1356. 

    1357. 

  1357.         static $mpeg_audio_version_lookup;

    1358. 

  1358.         static $mpeg_audio_layer_lookup;

    1359. 

  1359.         static $mpeg_audio_bitrate_lookup;

    1360. 

  1360.         static $mpeg_audio_frequency_lookup;

    1361. 

  1361.         static $mpeg_audio_channel_mode_lookup;

    1362. 

  1362.         static $mpeg_audio_mode_extension_lookup;

    1363. 

  1363.         static $mpeg_audio_emphasis_lookup;

    1364. 

  1364.         if (empty($mpeg_audio_version_lookup)) {

    1365. 

  1365.             $mpeg_audio_version_lookup        = getid3_mp3::MPEGaudioVersionarray();

    1366. 

  1366.             $mpeg_audio_layer_lookup          = getid3_mp3::MPEGaudioLayerarray();

    1367. 

  1367.             $mpeg_audio_bitrate_lookup        = getid3_mp3::MPEGaudioBitratearray();

    1368. 

  1368.             $mpeg_audio_frequency_lookup      = getid3_mp3::MPEGaudioFrequencyarray();

    1369. 

  1369.             $mpeg_audio_channel_mode_lookup   = getid3_mp3::MPEGaudioChannelModearray();

    1370. 

  1370.             $mpeg_audio_mode_extension_lookup = getid3_mp3::MPEGaudioModeExtensionarray();

    1371. 

  1371.             $mpeg_audio_emphasis_lookup       = getid3_mp3::MPEGaudioEmphasisarray();

    1372. 

  1372.         }

    1373. 

  1373. 

    1374. 

  1374.         if (isset($mpeg_audio_version_lookup[$raw_array['version']])) {

    1375. 

  1375.             $decodedVersion = $mpeg_audio_version_lookup[$raw_array['version']];

    1376. 

  1376.         } else {

    1377. 

  1377.             echo ($echo_errors ? "\n".'invalid Version ('.$raw_array['version'].')' : '');

    1378. 

  1378.             return false;

    1379. 

  1379.         }

    1380. 

  1380.         if (isset($mpeg_audio_layer_lookup[$raw_array['layer']])) {

    1381. 

  1381.             $decodedLayer = $mpeg_audio_layer_lookup[$raw_array['layer']];

    1382. 

  1382.         } else {

    1383. 

  1383.             echo ($echo_errors ? "\n".'invalid Layer ('.$raw_array['layer'].')' : '');

    1384. 

  1384.             return false;

    1385. 

  1385.         }

    1386. 

  1386.         if (!isset($mpeg_audio_bitrate_lookup[$decodedVersion][$decodedLayer][$raw_array['bitrate']])) {

    1387. 

  1387.             echo ($echo_errors ? "\n".'invalid Bitrate ('.$raw_array['bitrate'].')' : '');

    1388. 

  1388.             if ($raw_array['bitrate'] == 15) {

    1389. 

  1389.                 // known issue in LAME 3.90 - 3.93.1 where free-format has bitrate ID of 15 instead of 0

    1390. 

  1390.                 // let it go through here otherwise file will not be identified

    1391. 

  1391.                 if (!$allow_bitrate_15) {

    1392. 

  1392.                     return false;

    1393. 

  1393.                 }

    1394. 

  1394.             } else {

    1395. 

  1395.                 return false;

    1396. 

  1396.             }

    1397. 

  1397.         }

    1398. 

  1398.         if (!isset($mpeg_audio_frequency_lookup[$decodedVersion][$raw_array['sample_rate']])) {

    1399. 

  1399.             echo ($echo_errors ? "\n".'invalid Frequency ('.$raw_array['sample_rate'].')' : '');

    1400. 

  1400.             return false;

    1401. 

  1401.         }

    1402. 

  1402.         if (!isset($mpeg_audio_channel_mode_lookup[$raw_array['channelmode']])) {

    1403. 

  1403.             echo ($echo_errors ? "\n".'invalid ChannelMode ('.$raw_array['channelmode'].')' : '');

    1404. 

  1404.             return false;

    1405. 

  1405.         }

    1406. 

  1406.         if (!isset($mpeg_audio_mode_extension_lookup[$decodedLayer][$raw_array['modeextension']])) {

    1407. 

  1407.             echo ($echo_errors ? "\n".'invalid Mode Extension ('.$raw_array['modeextension'].')' : '');

    1408. 

  1408.             return false;

    1409. 

  1409.         }

    1410. 

  1410.         if (!isset($mpeg_audio_emphasis_lookup[$raw_array['emphasis']])) {

    1411. 

  1411.             echo ($echo_errors ? "\n".'invalid Emphasis ('.$raw_array['emphasis'].')' : '');

    1412. 

  1412.             return false;

    1413. 

  1413.         }

    1414. 

  1414.         // These are just either set or not set, you can't mess that up :)

    1415. 

  1415.         // $raw_array['protection'];

    1416. 

  1416.         // $raw_array['padding'];

    1417. 

  1417.         // $raw_array['private'];

    1418. 

  1418.         // $raw_array['copyright'];

    1419. 

  1419.         // $raw_array['original'];

    1420. 

  1420. 

    1421. 

  1421.         return true;

    1422. 

  1422.     }

    1423. 

  1423. 

    1424. 

  1424. 

    1425. 

  1425. 

    1426. 

  1426.     public static function MPEGaudioHeaderDecode($header_four_bytes) {

    1427. 

  1427.         // AAAA AAAA  AAAB BCCD  EEEE FFGH  IIJJ KLMM

    1428. 

  1428.         // A - Frame sync (all bits set)

    1429. 

  1429.         // B - MPEG Audio version ID

    1430. 

  1430.         // C - Layer description

    1431. 

  1431.         // D - Protection bit

    1432. 

  1432.         // E - Bitrate index

    1433. 

  1433.         // F - Sampling rate frequency index

    1434. 

  1434.         // G - Padding bit

    1435. 

  1435.         // H - Private bit

    1436. 

  1436.         // I - Channel Mode

    1437. 

  1437.         // J - Mode extension (Only if Joint stereo)

    1438. 

  1438.         // K - Copyright

    1439. 

  1439.         // L - Original

    1440. 

  1440.         // M - Emphasis

    1441. 

  1441. 

    1442. 

  1442.         if (strlen($header_four_bytes) != 4) {

    1443. 

  1443.             return false;

    1444. 

  1444.         }

    1445. 

  1445. 

    1446. 

  1446.         $mpeg_raw_header['synch']         = (getid3_lib::BigEndian2Int(substr($header_four_bytes, 0, 2)) & 0xFFE0) >> 4;

    1447. 

  1447.         $mpeg_raw_header['version']       = (ord($header_four_bytes{1}) & 0x18) >> 3; //    BB

    1448. 

  1448.         $mpeg_raw_header['layer']         = (ord($header_four_bytes{1}) & 0x06) >> 1; //      CC

    1449. 

  1449.         $mpeg_raw_header['protection']    = (ord($header_four_bytes{1}) & 0x01);      //        D

    1450. 

  1450.         $mpeg_raw_header['bitrate']       = (ord($header_four_bytes{2}) & 0xF0) >> 4; // EEEE

    1451. 

  1451.         $mpeg_raw_header['sample_rate']   = (ord($header_four_bytes{2}) & 0x0C) >> 2; //     FF

    1452. 

  1452.         $mpeg_raw_header['padding']       = (ord($header_four_bytes{2}) & 0x02) >> 1; //       G

    1453. 

  1453.         $mpeg_raw_header['private']       = (ord($header_four_bytes{2}) & 0x01);      //        H

    1454. 

  1454.         $mpeg_raw_header['channelmode']   = (ord($header_four_bytes{3}) & 0xC0) >> 6; // II

    1455. 

  1455.         $mpeg_raw_header['modeextension'] = (ord($header_four_bytes{3}) & 0x30) >> 4; //   JJ

    1456. 

  1456.         $mpeg_raw_header['copyright']     = (ord($header_four_bytes{3}) & 0x08) >> 3; //     K

    1457. 

  1457.         $mpeg_raw_header['original']      = (ord($header_four_bytes{3}) & 0x04) >> 2; //      L

    1458. 

  1458.         $mpeg_raw_header['emphasis']      = (ord($header_four_bytes{3}) & 0x03);      //       MM

    1459. 

  1459. 

    1460. 

  1460.         return $mpeg_raw_header;

    1461. 

  1461.     }

    1462. 

  1462. 

    1463. 

  1463. 

    1464. 

  1464. 

    1465. 

  1465.     public static function MPEGaudioFrameLength(&$bit_rate, &$version, &$layer, $padding, &$sample_rate) {

    1466. 

  1466.         

    1467. 

  1467.         if (!isset($cache[$bit_rate][$version][$layer][$padding][$sample_rate])) {

    1468. 

  1468.             $cache[$bit_rate][$version][$layer][$padding][$sample_rate] = false;

    1469. 

  1469.             if ($bit_rate != 'free') {

    1470. 

  1470. 

    1471. 

  1471.                 if ($version == '1') {

    1472. 

  1472. 

    1473. 

  1473.                     if ($layer == '1') {

    1474. 

  1474. 

    1475. 

  1475.                         // For Layer I slot is 32 bits long

    1476. 

  1476.                         $frame_length_coefficient = 48;

    1477. 

  1477.                         $slot_length = 4;

    1478. 

  1478. 

    1479. 

  1479.                     } else { // Layer 2 / 3

    1480. 

  1480. 

    1481. 

  1481.                         // for Layer 2 and Layer 3 slot is 8 bits long.

    1482. 

  1482.                         $frame_length_coefficient = 144;

    1483. 

  1483.                         $slot_length = 1;

    1484. 

  1484. 

    1485. 

  1485.                     }

    1486. 

  1486. 

    1487. 

  1487.                 } else { // MPEG-2 / MPEG-2.5

    1488. 

  1488. 

    1489. 

  1489.                     if ($layer == '1') {

    1490. 

  1490. 

    1491. 

  1491.                         // For Layer I slot is 32 bits long

    1492. 

  1492.                         $frame_length_coefficient = 24;

    1493. 

  1493.                         $slot_length = 4;

    1494. 

  1494. 

    1495. 

  1495.                     } elseif ($layer == '2') {

    1496. 

  1496. 

    1497. 

  1497.                         // for Layer 2 and Layer 3 slot is 8 bits long.

    1498. 

  1498.                         $frame_length_coefficient = 144;

    1499. 

  1499.                         $slot_length = 1;

    1500. 

  1500. 

    1501. 

  1501.                     } else { // layer 3

    1502. 

  1502. 

    1503. 

  1503.                         // for Layer 2 and Layer 3 slot is 8 bits long.

    1504. 

  1504.                         $frame_length_coefficient = 72;

    1505. 

  1505.                         $slot_length = 1;

    1506. 

  1506. 

    1507. 

  1507.                     }

    1508. 

  1508. 

    1509. 

  1509.                 }

    1510. 

  1510. 

    1511. 

  1511.                 // FrameLengthInBytes = ((Coefficient * BitRate) / SampleRate) + Padding

    1512. 

  1512.                 if ($sample_rate > 0) {

    1513. 

  1513.                     $new_frame_length  = ($frame_length_coefficient * $bit_rate) / $sample_rate;

    1514. 

  1514.                     $new_frame_length  = floor($new_frame_length / $slot_length) * $slot_length; // round to next-lower multiple of SlotLength (1 byte for Layer 2/3, 4 bytes for Layer I)

    1515. 

  1515.                     if ($padding) {

    1516. 

  1516.                         $new_frame_length += $slot_length;

    1517. 

  1517.                     }

    1518. 

  1518.                     $cache[$bit_rate][$version][$layer][$padding][$sample_rate] = (int) $new_frame_length;

    1519. 

  1519.                 }

    1520. 

  1520.             }

    1521. 

  1521.         }

    1522. 

  1522.         return $cache[$bit_rate][$version][$layer][$padding][$sample_rate];

    1523. 

  1523.     }

    1524. 

  1524. 

    1525. 

  1525. 

    1526. 

  1526. 

    1527. 

  1527.     public static function ClosestStandardMP3Bitrate($bit_rate) {

    1528. 

  1528.         

    1529. 

  1529.         static $standard_bit_rates = array (320000, 256000, 224000, 192000, 160000, 128000, 112000, 96000, 80000, 64000, 56000, 48000, 40000, 32000, 24000, 16000, 8000);

    1530. 

  1530.         static $bit_rate_table = array (0=>'-');

    1531. 

  1531.         $round_bit_rate = intval(round($bit_rate, -3));

    1532. 

  1532.         if (!isset($bit_rate_table[$round_bit_rate])) {

    1533. 

  1533.             if ($round_bit_rate > 320000) {

    1534. 

  1534.                 $bit_rate_table[$round_bit_rate] = round($bit_rate, -4);

    1535. 

  1535.             } else {

    1536. 

  1536.                 $last_bit_rate = 320000;

    1537. 

  1537.                 foreach ($standard_bit_rates as $standard_bit_rate) {

    1538. 

  1538.                     $bit_rate_table[$round_bit_rate] = $standard_bit_rate;

    1539. 

  1539.                     if ($round_bit_rate >= $standard_bit_rate - (($last_bit_rate - $standard_bit_rate) / 2)) {

    1540. 

  1540.                         break;

    1541. 

  1541.                     }

    1542. 

  1542.                     $last_bit_rate = $standard_bit_rate;

    1543. 

  1543.                 }

    1544. 

  1544.             }

    1545. 

  1545.         }

    1546. 

  1546.         return $bit_rate_table[$round_bit_rate];

    1547. 

  1547.     }

    1548. 

  1548. 

    1549. 

  1549. 

    1550. 

  1550. 

    1551. 

  1551.     public static function XingVBRidOffset($version, $channel_mode) {

    1552. 

  1552.         

    1553. 

  1553.         static $lookup = array (

    1554. 

  1554.                 '1'   => array ('mono'          => 0x15, // 4 + 17 = 21

    1555. 

  1555.                                 'stereo'        => 0x24, // 4 + 32 = 36

    1556. 

  1556.                                 'joint stereo'  => 0x24,

    1557. 

  1557.                                 'dual channel'  => 0x24

    1558. 

  1558.                                ),

    1559. 

  1559. 

    1560. 

  1560.                 '2'   => array ('mono'          => 0x0D, // 4 +  9 = 13

    1561. 

  1561.                                 'stereo'        => 0x15, // 4 + 17 = 21

    1562. 

  1562.                                 'joint stereo'  => 0x15,

    1563. 

  1563.                                 'dual channel'  => 0x15

    1564. 

  1564.                                ),

    1565. 

  1565. 

    1566. 

  1566.                 '2.5' => array ('mono'          => 0x15,

    1567. 

  1567.                                 'stereo'        => 0x15,

    1568. 

  1568.                                 'joint stereo'  => 0x15,

    1569. 

  1569.                                 'dual channel'  => 0x15

    1570. 

  1570.                                )

    1571. 

  1571.         );

    1572. 

  1572.         

    1573. 

  1573.         return $lookup[$version][$channel_mode];

    1574. 

  1574.     }

    1575. 

  1575. 

    1576. 

  1576. 

    1577. 

  1577. 

    1578. 

  1578.     public static function LAMEvbrMethodLookup($vbr_method_id) {

    1579. 

  1579.         

    1580. 

  1580.         static $lookup = array (

    1581. 

  1581.             0x00 => 'unknown',

    1582. 

  1582.             0x01 => 'cbr',

    1583. 

  1583.             0x02 => 'abr',

    1584. 

  1584.             0x03 => 'vbr-old / vbr-rh',

    1585. 

  1585.             0x04 => 'vbr-new / vbr-mtrh',

    1586. 

  1586.             0x05 => 'vbr-mt',

    1587. 

  1587.             0x06 => 'Full VBR Method 4',

    1588. 

  1588.             0x08 => 'constant bitrate 2 pass',

    1589. 

  1589.             0x09 => 'abr 2 pass',

    1590. 

  1590.             0x0F => 'reserved'

    1591. 

  1591.         );

    1592. 

  1592.         return (isset($lookup[$vbr_method_id]) ? $lookup[$vbr_method_id] : '');

    1593. 

  1593.     }

    1594. 

  1594. 

    1595. 

  1595. 

    1596. 

  1596. 

    1597. 

  1597.     public static function LAMEmiscStereoModeLookup($stereo_mode_id) {

    1598. 

  1598.     

    1599. 

  1599.         static $lookup = array (

    1600. 

  1600.             0 => 'mono',

    1601. 

  1601.             1 => 'stereo',

    1602. 

  1602.             2 => 'dual mono',

    1603. 

  1603.             3 => 'joint stereo',

    1604. 

  1604.             4 => 'forced stereo',

    1605. 

  1605.             5 => 'auto',

    1606. 

  1606.             6 => 'intensity stereo',

    1607. 

  1607.             7 => 'other'

    1608. 

  1608.         );

    1609. 

  1609.         return (isset($lookup[$stereo_mode_id]) ? $lookup[$stereo_mode_id] : '');

    1610. 

  1610.     }

    1611. 

  1611. 

    1612. 

  1612. 

    1613. 

  1613. 

    1614. 

  1614.     public static function LAMEmiscSourceSampleFrequencyLookup($source_sample_frequency_id) {

    1615. 

  1615.         

    1616. 

  1616.         static $lookup = array (

    1617. 

  1617.             0 => '<= 32 kHz',

    1618. 

  1618.             1 => '44.1 kHz',

    1619. 

  1619.             2 => '48 kHz',

    1620. 

  1620.             3 => '> 48kHz'

    1621. 

  1621.         );

    1622. 

  1622.         return (isset($lookup[$source_sample_frequency_id]) ? $lookup[$source_sample_frequency_id] : '');

    1623. 

  1623.     }

    1624. 

  1624. 

    1625. 

  1625. 

    1626. 

  1626. 

    1627. 

  1627.     public static function LAMEsurroundInfoLookup($surround_info_id) {

    1628. 

  1628.         

    1629. 

  1629.         static $lookup = array (

    1630. 

  1630.             0 => 'no surround info',

    1631. 

  1631.             1 => 'DPL encoding',

    1632. 

  1632.             2 => 'DPL2 encoding',

    1633. 

  1633.             3 => 'Ambisonic encoding'

    1634. 

  1634.         );

    1635. 

  1635.         return (isset($lookup[$surround_info_id]) ? $lookup[$surround_info_id] : 'reserved');

    1636. 

  1636.     }

    1637. 

  1637. 

    1638. 

  1638. 

    1639. 

  1639. 

    1640. 

  1640.     public static function LAMEpresetUsedLookup($lame_tag) {

    1641. 

  1641.         

    1642. 

  1642.         if ($lame_tag['preset_used_id'] == 0) {

    1643. 

  1643.             // no preset used (LAME >=3.93)

    1644. 

  1644.             // no preset recorded (LAME <3.93)

    1645. 

  1645.             return '';

    1646. 

  1646.         }

    1647. 

  1647.         

    1648. 

  1648.         $lame_preset_used_lookup = array ();

    1649. 

  1649.         

    1650. 

  1650.         for ($i = 8; $i <= 320; $i++) {

    1651. 

  1651.             switch ($lame_tag['vbr_method']) {

    1652. 

  1652.                 case 'cbr':

    1653. 

  1653.                     $lame_preset_used_lookup[$i] = '--alt-preset '.$lame_tag['vbr_method'].' '.$i;

    1654. 

  1654.                     break;

    1655. 

  1655.                 case 'abr':

    1656. 

  1656.                 default: // other VBR modes shouldn't be here(?)

    1657. 

  1657.                     $lame_preset_used_lookup[$i] = '--alt-preset '.$i;

    1658. 

  1658.                     break;

    1659. 

  1659.             }

    1660. 

  1660.         }

    1661. 

  1661. 

    1662. 

  1662.         // named old-style presets (studio, phone, voice, etc) are handled in GuessEncoderOptions()

    1663. 

  1663. 

    1664. 

  1664.         // named alt-presets

    1665. 

  1665.         $lame_preset_used_lookup[1000] = '--r3mix';

    1666. 

  1666.         $lame_preset_used_lookup[1001] = '--alt-preset standard';

    1667. 

  1667.         $lame_preset_used_lookup[1002] = '--alt-preset extreme';

    1668. 

  1668.         $lame_preset_used_lookup[1003] = '--alt-preset insane';

    1669. 

  1669.         $lame_preset_used_lookup[1004] = '--alt-preset fast standard';

    1670. 

  1670.         $lame_preset_used_lookup[1005] = '--alt-preset fast extreme';

    1671. 

  1671.         $lame_preset_used_lookup[1006] = '--alt-preset medium';

    1672. 

  1672.         $lame_preset_used_lookup[1007] = '--alt-preset fast medium';

    1673. 

  1673. 

    1674. 

  1674.         // LAME 3.94 additions/changes

    1675. 

  1675.         $lame_preset_used_lookup[1010] = '--preset portable';                                                            // 3.94a15 Oct 21 2003

    1676. 

  1676.         $lame_preset_used_lookup[1015] = '--preset radio';                                                               // 3.94a15 Oct 21 2003

    1677. 

  1677. 

    1678. 

  1678.         $lame_preset_used_lookup[320]  = '--preset insane';                                                              // 3.94a15 Nov 12 2003

    1679. 

  1679.         $lame_preset_used_lookup[410]  = '-V9';

    1680. 

  1680.         $lame_preset_used_lookup[420]  = '-V8';

    1681. 

  1681.         $lame_preset_used_lookup[430]  = '--preset radio';                                                               // 3.94a15 Nov 12 2003

    1682. 

  1682.         $lame_preset_used_lookup[440]  = '-V6';

    1683. 

  1683.         $lame_preset_used_lookup[450]  = '--preset '.(($lame_tag['raw']['vbr_method'] == 4) ? 'fast ' : '').'portable';  // 3.94a15 Nov 12 2003

    1684. 

  1684.         $lame_preset_used_lookup[460]  = '--preset '.(($lame_tag['raw']['vbr_method'] == 4) ? 'fast ' : '').'medium';    // 3.94a15 Nov 12 2003

    1685. 

  1685.         $lame_preset_used_lookup[470]  = '--r3mix';                                                                      // 3.94b1  Dec 18 2003

    1686. 

  1686.         $lame_preset_used_lookup[480]  = '--preset '.(($lame_tag['raw']['vbr_method'] == 4) ? 'fast ' : '').'standard';  // 3.94a15 Nov 12 2003

    1687. 

  1687.         $lame_preset_used_lookup[490]  = '-V1';

    1688. 

  1688.         $lame_preset_used_lookup[500]  = '--preset '.(($lame_tag['raw']['vbr_method'] == 4) ? 'fast ' : '').'extreme';   // 3.94a15 Nov 12 2003

    1689. 

  1689.         

    1690. 

  1690.         return (isset($lame_preset_used_lookup[$lame_tag['preset_used_id']]) ? $lame_preset_used_lookup[$lame_tag['preset_used_id']] : 'new/unknown preset: '.$lame_tag['preset_used_id'].' - report to info@getid3.org');

    1691. 

  1691.     }

    1692. 

  1692. 	

    1693. 

  1693. 	

    1694. 

  1694. }

    1695. 

  1695. 

    1696. 

  1696. ?>
    1697.