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/getid3/module.audio.mp3.php

https://bitbucket.org/holyfield/wpgetid
PHP | 2011 lines | 1431 code | 284 blank | 296 comment | 399 complexity | f6ce3db00d2abb944602deee9130d95a MD5 | raw file

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  1. <?php
    2. 

  2. /////////////////////////////////////////////////////////////////
    3. 

  3. /// getID3() by James Heinrich <info@getid3.org>               //
    4. 

  4. //  available at http://getid3.sourceforge.net                 //
    5. 

  5. //            or http://www.getid3.org                         //
    6. 

  6. /////////////////////////////////////////////////////////////////
    7. 

  7. // See readme.txt for more details                             //
    8. 

  8. /////////////////////////////////////////////////////////////////
    9. 

  9. //                                                             //
    10. 

  10. // module.audio.mp3.php                                        //
    11. 

  11. // module for analyzing MP3 files                              //
    12. 

  12. // dependencies: NONE                                          //
    13. 

  13. //                                                            ///
    14. 

  14. /////////////////////////////////////////////////////////////////
    15. 

  15. 

  16. 

  17. // number of frames to scan to determine if MPEG-audio sequence is valid
    18. 

  18. // Lower this number to 5-20 for faster scanning
    19. 

  19. // Increase this number to 50+ for most accurate detection of valid VBR/CBR
    20. 

  20. // mpeg-audio streams
    21. 

  21. define('GETID3_MP3_VALID_CHECK_FRAMES', 35);
    22. 

  22. 

  23. 

  24. class getid3_mp3 extends getid3_handler
    25. 

  25. {
    26. 

  26. 

  27. 	var $allow_bruteforce = false; // forces getID3() to scan the file byte-by-byte and log all the valid audio frame headers - extremely slow, unrecommended, but may provide data from otherwise-unusuable files
    28. 

  28. 

  29. 	function Analyze() {
    30. 

  30. 		$info = &$this->getid3->info;
    31. 

  31. 

  32. 		$initialOffset = $info['avdataoffset'];
    33. 

  33. 

  34. 		if (!$this->getOnlyMPEGaudioInfo($info['avdataoffset'])) {
    35. 

  35. 			if ($this->allow_bruteforce) {
    36. 

  36. 				$info['error'][] = 'Rescanning file in BruteForce mode';
    37. 

  37. 				$this->getOnlyMPEGaudioInfoBruteForce($this->getid3->fp, $info);
    38. 

  38. 			}
    39. 

  39. 		}
    40. 

  40. 

  41. 

  42. 		if (isset($info['mpeg']['audio']['bitrate_mode'])) {
    43. 

  43. 			$info['audio']['bitrate_mode'] = strtolower($info['mpeg']['audio']['bitrate_mode']);
    44. 

  44. 		}
    45. 

  45. 

  46. 		if (((isset($info['id3v2']['headerlength']) && ($info['avdataoffset'] > $info['id3v2']['headerlength'])) || (!isset($info['id3v2']) && ($info['avdataoffset'] > 0) && ($info['avdataoffset'] != $initialOffset)))) {
    47. 

  47. 

  48. 			$synchoffsetwarning = 'Unknown data before synch ';
    49. 

  49. 			if (isset($info['id3v2']['headerlength'])) {
    50. 

  50. 				$synchoffsetwarning .= '(ID3v2 header ends at '.$info['id3v2']['headerlength'].', then '.($info['avdataoffset'] - $info['id3v2']['headerlength']).' bytes garbage, ';
    51. 

  51. 			} elseif ($initialOffset > 0) {
    52. 

  52. 				$synchoffsetwarning .= '(should be at '.$initialOffset.', ';
    53. 

  53. 			} else {
    54. 

  54. 				$synchoffsetwarning .= '(should be at beginning of file, ';
    55. 

  55. 			}
    56. 

  56. 			$synchoffsetwarning .= 'synch detected at '.$info['avdataoffset'].')';
    57. 

  57. 			if (isset($info['audio']['bitrate_mode']) && ($info['audio']['bitrate_mode'] == 'cbr')) {
    58. 

  58. 

  59. 				if (!empty($info['id3v2']['headerlength']) && (($info['avdataoffset'] - $info['id3v2']['headerlength']) == $info['mpeg']['audio']['framelength'])) {
    60. 

  60. 

  61. 					$synchoffsetwarning .= '. This is a known problem with some versions of LAME (3.90-3.92) DLL in CBR mode.';
    62. 

  62. 					$info['audio']['codec'] = 'LAME';
    63. 

  63. 					$CurrentDataLAMEversionString = 'LAME3.';
    64. 

  64. 

  65. 				} elseif (empty($info['id3v2']['headerlength']) && ($info['avdataoffset'] == $info['mpeg']['audio']['framelength'])) {
    66. 

  66. 

  67. 					$synchoffsetwarning .= '. This is a known problem with some versions of LAME (3.90 - 3.92) DLL in CBR mode.';
    68. 

  68. 					$info['audio']['codec'] = 'LAME';
    69. 

  69. 					$CurrentDataLAMEversionString = 'LAME3.';
    70. 

  70. 

  71. 				}
    72. 

  72. 

  73. 			}
    74. 

  74. 			$info['warning'][] = $synchoffsetwarning;
    75. 

  75. 

  76. 		}
    77. 

  77. 

  78. 		if (isset($info['mpeg']['audio']['LAME'])) {
    79. 

  79. 			$info['audio']['codec'] = 'LAME';
    80. 

  80. 			if (!empty($info['mpeg']['audio']['LAME']['long_version'])) {
    81. 

  81. 				$info['audio']['encoder'] = rtrim($info['mpeg']['audio']['LAME']['long_version'], "\x00");
    82. 

  82. 			} elseif (!empty($info['mpeg']['audio']['LAME']['short_version'])) {
    83. 

  83. 				$info['audio']['encoder'] = rtrim($info['mpeg']['audio']['LAME']['short_version'], "\x00");
    84. 

  84. 			}
    85. 

  85. 		}
    86. 

  86. 

  87. 		$CurrentDataLAMEversionString = (!empty($CurrentDataLAMEversionString) ? $CurrentDataLAMEversionString : (isset($info['audio']['encoder']) ? $info['audio']['encoder'] : ''));
    88. 

  88. 		if (!empty($CurrentDataLAMEversionString) && (substr($CurrentDataLAMEversionString, 0, 6) == 'LAME3.') && !preg_match('[0-9\)]', substr($CurrentDataLAMEversionString, -1))) {
    89. 

  89. 			// a version number of LAME that does not end with a number like "LAME3.92"
    90. 

  90. 			// or with a closing parenthesis like "LAME3.88 (alpha)"
    91. 

  91. 			// or a version of LAME with the LAMEtag-not-filled-in-DLL-mode bug (3.90-3.92)
    92. 

  92. 

  93. 			// not sure what the actual last frame length will be, but will be less than or equal to 1441
    94. 

  94. 			$PossiblyLongerLAMEversion_FrameLength = 1441;
    95. 

  95. 

  96. 			// Not sure what version of LAME this is - look in padding of last frame for longer version string
    97. 

  97. 			$PossibleLAMEversionStringOffset = $info['avdataend'] - $PossiblyLongerLAMEversion_FrameLength;
    98. 

  98. 			fseek($this->getid3->fp, $PossibleLAMEversionStringOffset);
    99. 

  99. 			$PossiblyLongerLAMEversion_Data = fread($this->getid3->fp, $PossiblyLongerLAMEversion_FrameLength);
    100. 

  100. 			switch (substr($CurrentDataLAMEversionString, -1)) {
    101. 

  101. 				case 'a':
    102. 

  102. 				case 'b':
    103. 

  103. 					// "LAME3.94a" will have a longer version string of "LAME3.94 (alpha)" for example
    104. 

  104. 					// need to trim off "a" to match longer string
    105. 

  105. 					$CurrentDataLAMEversionString = substr($CurrentDataLAMEversionString, 0, -1);
    106. 

  106. 					break;
    107. 

  107. 			}
    108. 

  108. 			if (($PossiblyLongerLAMEversion_String = strstr($PossiblyLongerLAMEversion_Data, $CurrentDataLAMEversionString)) !== false) {
    109. 

  109. 				if (substr($PossiblyLongerLAMEversion_String, 0, strlen($CurrentDataLAMEversionString)) == $CurrentDataLAMEversionString) {
    110. 

  110. 					$PossiblyLongerLAMEversion_NewString = substr($PossiblyLongerLAMEversion_String, 0, strspn($PossiblyLongerLAMEversion_String, 'LAME0123456789., (abcdefghijklmnopqrstuvwxyzJFSOND)')); //"LAME3.90.3"  "LAME3.87 (beta 1, Sep 27 2000)" "LAME3.88 (beta)"
    111. 

  111. 					if (empty($info['audio']['encoder']) || (strlen($PossiblyLongerLAMEversion_NewString) > strlen($info['audio']['encoder']))) {
    112. 

  112. 						$info['audio']['encoder'] = $PossiblyLongerLAMEversion_NewString;
    113. 

  113. 					}
    114. 

  114. 				}
    115. 

  115. 			}
    116. 

  116. 		}
    117. 

  117. 		if (!empty($info['audio']['encoder'])) {
    118. 

  118. 			$info['audio']['encoder'] = rtrim($info['audio']['encoder'], "\x00 ");
    119. 

  119. 		}
    120. 

  120. 

  121. 		switch (isset($info['mpeg']['audio']['layer']) ? $info['mpeg']['audio']['layer'] : '') {
    122. 

  122. 			case 1:
    123. 

  123. 			case 2:
    124. 

  124. 				$info['audio']['dataformat'] = 'mp'.$info['mpeg']['audio']['layer'];
    125. 

  125. 				break;
    126. 

  126. 		}
    127. 

  127. 		if (isset($info['fileformat']) && ($info['fileformat'] == 'mp3')) {
    128. 

  128. 			switch ($info['audio']['dataformat']) {
    129. 

  129. 				case 'mp1':
    130. 

  130. 				case 'mp2':
    131. 

  131. 				case 'mp3':
    132. 

  132. 					$info['fileformat'] = $info['audio']['dataformat'];
    133. 

  133. 					break;
    134. 

  134. 

  135. 				default:
    136. 

  136. 					$info['warning'][] = 'Expecting [audio][dataformat] to be mp1/mp2/mp3 when fileformat == mp3, [audio][dataformat] actually "'.$info['audio']['dataformat'].'"';
    137. 

  137. 					break;
    138. 

  138. 			}
    139. 

  139. 		}
    140. 

  140. 

  141. 		if (empty($info['fileformat'])) {
    142. 

  142. 			unset($info['fileformat']);
    143. 

  143. 			unset($info['audio']['bitrate_mode']);
    144. 

  144. 			unset($info['avdataoffset']);
    145. 

  145. 			unset($info['avdataend']);
    146. 

  146. 			return false;
    147. 

  147. 		}
    148. 

  148. 

  149. 		$info['mime_type']         = 'audio/mpeg';
    150. 

  150. 		$info['audio']['lossless'] = false;
    151. 

  151. 

  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. 		$info['audio']['encoder_options'] = $this->GuessEncoderOptions();
    158. 

  158. 

  159. 		return true;
    160. 

  160. 	}
    161. 

  161. 

  162. 

  163. 	function GuessEncoderOptions() {
    164. 

  164. 		// shortcuts
    165. 

  165. 		$info = &$this->getid3->info;
    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. 		$encoder_options = '';
    174. 

  174. 		static $NamedPresetBitrates = array(16, 24, 40, 56, 112, 128, 160, 192, 256);
    175. 

  175. 

  176. 		if (isset($thisfile_mpeg_audio['VBR_method']) && ($thisfile_mpeg_audio['VBR_method'] == 'Fraunhofer') && !empty($thisfile_mpeg_audio['VBR_quality'])) {
    177. 

  177. 

  178. 			$encoder_options = 'VBR q'.$thisfile_mpeg_audio['VBR_quality'];
    179. 

  179. 

  180. 		} elseif (!empty($thisfile_mpeg_audio_lame['preset_used']) && (!in_array($thisfile_mpeg_audio_lame['preset_used_id'], $NamedPresetBitrates))) {
    181. 

  181. 

  182. 			$encoder_options = $thisfile_mpeg_audio_lame['preset_used'];
    183. 

  183. 

  184. 		} elseif (!empty($thisfile_mpeg_audio_lame['vbr_quality'])) {
    185. 

  185. 

  186. 			static $KnownEncoderValues = array();
    187. 

  187. 			if (empty($KnownEncoderValues)) {
    188. 

  188. 

  189. 				//$KnownEncoderValues[abrbitrate_minbitrate][vbr_quality][raw_vbr_method][raw_noise_shaping][raw_stereo_mode][ath_type][lowpass_frequency] = 'preset name';
    190. 

  190. 				$KnownEncoderValues[0xFF][58][1][1][3][2][20500] = '--alt-preset insane';        // 3.90,   3.90.1, 3.92
    191. 

  191. 				$KnownEncoderValues[0xFF][58][1][1][3][2][20600] = '--alt-preset insane';        // 3.90.2, 3.90.3, 3.91
    192. 

  192. 				$KnownEncoderValues[0xFF][57][1][1][3][4][20500] = '--alt-preset insane';        // 3.94,   3.95
    193. 

  193. 				$KnownEncoderValues['**'][78][3][2][3][2][19500] = '--alt-preset extreme';       // 3.90,   3.90.1, 3.92
    194. 

  194. 				$KnownEncoderValues['**'][78][3][2][3][2][19600] = '--alt-preset extreme';       // 3.90.2, 3.91
    195. 

  195. 				$KnownEncoderValues['**'][78][3][1][3][2][19600] = '--alt-preset extreme';       // 3.90.3
    196. 

  196. 				$KnownEncoderValues['**'][78][4][2][3][2][19500] = '--alt-preset fast extreme';  // 3.90,   3.90.1, 3.92
    197. 

  197. 				$KnownEncoderValues['**'][78][4][2][3][2][19600] = '--alt-preset fast extreme';  // 3.90.2, 3.90.3, 3.91
    198. 

  198. 				$KnownEncoderValues['**'][78][3][2][3][4][19000] = '--alt-preset standard';      // 3.90,   3.90.1, 3.90.2, 3.91, 3.92
    199. 

  199. 				$KnownEncoderValues['**'][78][3][1][3][4][19000] = '--alt-preset standard';      // 3.90.3
    200. 

  200. 				$KnownEncoderValues['**'][78][4][2][3][4][19000] = '--alt-preset fast standard'; // 3.90,   3.90.1, 3.90.2, 3.91, 3.92
    201. 

  201. 				$KnownEncoderValues['**'][78][4][1][3][4][19000] = '--alt-preset fast standard'; // 3.90.3
    202. 

  202. 				$KnownEncoderValues['**'][88][4][1][3][3][19500] = '--r3mix';                    // 3.90,   3.90.1, 3.92
    203. 

  203. 				$KnownEncoderValues['**'][88][4][1][3][3][19600] = '--r3mix';                    // 3.90.2, 3.90.3, 3.91
    204. 

  204. 				$KnownEncoderValues['**'][67][4][1][3][4][18000] = '--r3mix';                    // 3.94,   3.95
    205. 

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

  206. 				$KnownEncoderValues['**'][68][4][2][3][4][18000] = '--alt-preset fast medium';   // 3.90.3
    207. 

  207. 

  208. 				$KnownEncoderValues[0xFF][99][1][1][1][2][0]     = '--preset studio';            // 3.90,   3.90.1, 3.90.2, 3.91, 3.92
    209. 

  209. 				$KnownEncoderValues[0xFF][58][2][1][3][2][20600] = '--preset studio';            // 3.90.3, 3.93.1
    210. 

  210. 				$KnownEncoderValues[0xFF][58][2][1][3][2][20500] = '--preset studio';            // 3.93
    211. 

  211. 				$KnownEncoderValues[0xFF][57][2][1][3][4][20500] = '--preset studio';            // 3.94,   3.95
    212. 

  212. 				$KnownEncoderValues[0xC0][88][1][1][1][2][0]     = '--preset cd';                // 3.90,   3.90.1, 3.90.2,   3.91, 3.92
    213. 

  213. 				$KnownEncoderValues[0xC0][58][2][2][3][2][19600] = '--preset cd';                // 3.90.3, 3.93.1
    214. 

  214. 				$KnownEncoderValues[0xC0][58][2][2][3][2][19500] = '--preset cd';                // 3.93
    215. 

  215. 				$KnownEncoderValues[0xC0][57][2][1][3][4][19500] = '--preset cd';                // 3.94,   3.95
    216. 

  216. 				$KnownEncoderValues[0xA0][78][1][1][3][2][18000] = '--preset hifi';              // 3.90,   3.90.1, 3.90.2,   3.91, 3.92
    217. 

  217. 				$KnownEncoderValues[0xA0][58][2][2][3][2][18000] = '--preset hifi';              // 3.90.3, 3.93,   3.93.1
    218. 

  218. 				$KnownEncoderValues[0xA0][57][2][1][3][4][18000] = '--preset hifi';              // 3.94,   3.95
    219. 

  219. 				$KnownEncoderValues[0x80][67][1][1][3][2][18000] = '--preset tape';              // 3.90,   3.90.1, 3.90.2,   3.91, 3.92
    220. 

  220. 				$KnownEncoderValues[0x80][67][1][1][3][2][15000] = '--preset radio';             // 3.90,   3.90.1, 3.90.2,   3.91, 3.92
    221. 

  221. 				$KnownEncoderValues[0x70][67][1][1][3][2][15000] = '--preset fm';                // 3.90,   3.90.1, 3.90.2,   3.91, 3.92
    222. 

  222. 				$KnownEncoderValues[0x70][58][2][2][3][2][16000] = '--preset tape/radio/fm';     // 3.90.3, 3.93,   3.93.1
    223. 

  223. 				$KnownEncoderValues[0x70][57][2][1][3][4][16000] = '--preset tape/radio/fm';     // 3.94,   3.95
    224. 

  224. 				$KnownEncoderValues[0x38][58][2][2][0][2][10000] = '--preset voice';             // 3.90.3, 3.93,   3.93.1
    225. 

  225. 				$KnownEncoderValues[0x38][57][2][1][0][4][15000] = '--preset voice';             // 3.94,   3.95
    226. 

  226. 				$KnownEncoderValues[0x38][57][2][1][0][4][16000] = '--preset voice';             // 3.94a14
    227. 

  227. 				$KnownEncoderValues[0x28][65][1][1][0][2][7500]  = '--preset mw-us';             // 3.90,   3.90.1, 3.92
    228. 

  228. 				$KnownEncoderValues[0x28][65][1][1][0][2][7600]  = '--preset mw-us';             // 3.90.2, 3.91
    229. 

  229. 				$KnownEncoderValues[0x28][58][2][2][0][2][7000]  = '--preset mw-us';             // 3.90.3, 3.93,   3.93.1
    230. 

  230. 				$KnownEncoderValues[0x28][57][2][1][0][4][10500] = '--preset mw-us';             // 3.94,   3.95
    231. 

  231. 				$KnownEncoderValues[0x28][57][2][1][0][4][11200] = '--preset mw-us';             // 3.94a14
    232. 

  232. 				$KnownEncoderValues[0x28][57][2][1][0][4][8800]  = '--preset mw-us';             // 3.94a15
    233. 

  233. 				$KnownEncoderValues[0x18][58][2][2][0][2][4000]  = '--preset phon+/lw/mw-eu/sw'; // 3.90.3, 3.93.1
    234. 

  234. 				$KnownEncoderValues[0x18][58][2][2][0][2][3900]  = '--preset phon+/lw/mw-eu/sw'; // 3.93
    235. 

  235. 				$KnownEncoderValues[0x18][57][2][1][0][4][5900]  = '--preset phon+/lw/mw-eu/sw'; // 3.94,   3.95
    236. 

  236. 				$KnownEncoderValues[0x18][57][2][1][0][4][6200]  = '--preset phon+/lw/mw-eu/sw'; // 3.94a14
    237. 

  237. 				$KnownEncoderValues[0x18][57][2][1][0][4][3200]  = '--preset phon+/lw/mw-eu/sw'; // 3.94a15
    238. 

  238. 				$KnownEncoderValues[0x10][58][2][2][0][2][3800]  = '--preset phone';             // 3.90.3, 3.93.1
    239. 

  239. 				$KnownEncoderValues[0x10][58][2][2][0][2][3700]  = '--preset phone';             // 3.93
    240. 

  240. 				$KnownEncoderValues[0x10][57][2][1][0][4][5600]  = '--preset phone';             // 3.94,   3.95
    241. 

  241. 			}
    242. 

  242. 

  243. 			if (isset($KnownEncoderValues[$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. 				$encoder_options = $KnownEncoderValues[$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. 			} elseif (isset($KnownEncoderValues['**'][$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. 				$encoder_options = $KnownEncoderValues['**'][$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. 			} elseif ($info['audio']['bitrate_mode'] == 'vbr') {
    252. 

  252. 

  253. 				// http://gabriel.mp3-tech.org/mp3infotag.html
    254. 

  254. 				// int    Quality = (100 - 10 * gfp->VBR_q - gfp->quality)h
    255. 

  255. 

  256. 

  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. 			} elseif ($info['audio']['bitrate_mode'] == 'cbr') {
    262. 

  262. 

  263. 				$encoder_options = strtoupper($info['audio']['bitrate_mode']).ceil($info['audio']['bitrate'] / 1000);
    264. 

  264. 

  265. 			} else {
    266. 

  266. 

  267. 				$encoder_options = strtoupper($info['audio']['bitrate_mode']);
    268. 

  268. 

  269. 			}
    270. 

  270. 

  271. 		} elseif (!empty($thisfile_mpeg_audio_lame['bitrate_abr'])) {
    272. 

  272. 

  273. 			$encoder_options = 'ABR'.$thisfile_mpeg_audio_lame['bitrate_abr'];
    274. 

  274. 

  275. 		} elseif (!empty($info['audio']['bitrate'])) {
    276. 

  276. 

  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. 		}
    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. 		if (!empty($thisfile_mpeg_audio_lame['encoding_flags']['nogap_prev']) || !empty($thisfile_mpeg_audio_lame['encoding_flags']['nogap_next'])) {
    289. 

  289. 			$encoder_options .= ' --nogap';
    290. 

  290. 		}
    291. 

  291. 

  292. 		if (!empty($thisfile_mpeg_audio_lame['lowpass_frequency'])) {
    293. 

  293. 			$ExplodedOptions = explode(' ', $encoder_options, 4);
    294. 

  294. 			if ($ExplodedOptions[0] == '--r3mix') {
    295. 

  295. 				$ExplodedOptions[1] = 'r3mix';
    296. 

  296. 			}
    297. 

  297. 			switch ($ExplodedOptions[0]) {
    298. 

  298. 				case '--preset':
    299. 

  299. 				case '--alt-preset':
    300. 

  300. 				case '--r3mix':
    301. 

  301. 					if ($ExplodedOptions[1] == 'fast') {
    302. 

  302. 						$ExplodedOptions[1] .= ' '.$ExplodedOptions[2];
    303. 

  303. 					}
    304. 

  304. 					switch ($ExplodedOptions[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 $ExpectedLowpass = 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($ExpectedLowpass[$ExplodedOptions[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. 						default:
    337. 

  337. 							break;
    338. 

  338. 					}
    339. 

  339. 					break;
    340. 

  340. 			}
    341. 

  341. 		}
    342. 

  342. 

  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. 						$ExplodedOptions = explode(' ', $encoder_options, 4);
    357. 

  357. 						switch ($ExplodedOptions[0]) {
    358. 

  358. 							case '--preset':
    359. 

  359. 							case '--alt-preset':
    360. 

  360. 								switch ($ExplodedOptions[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. 									default:
    371. 

  371. 										static $ExpectedResampledRate = 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($ExpectedResampledRate[$ExplodedOptions[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. 							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. 		return $encoder_options;
    404. 

  404. 	}
    405. 

  405. 

  406. 

  407. 	function decodeMPEGaudioHeader($offset, &$info, $recursivesearch=true, $ScanAsCBR=false, $FastMPEGheaderScan=false) {
    408. 

  408. 		static $MPEGaudioVersionLookup;
    409. 

  409. 		static $MPEGaudioLayerLookup;
    410. 

  410. 		static $MPEGaudioBitrateLookup;
    411. 

  411. 		static $MPEGaudioFrequencyLookup;
    412. 

  412. 		static $MPEGaudioChannelModeLookup;
    413. 

  413. 		static $MPEGaudioModeExtensionLookup;
    414. 

  414. 		static $MPEGaudioEmphasisLookup;
    415. 

  415. 		if (empty($MPEGaudioVersionLookup)) {
    416. 

  416. 			$MPEGaudioVersionLookup       = getid3_mp3::MPEGaudioVersionArray();
    417. 

  417. 			$MPEGaudioLayerLookup         = getid3_mp3::MPEGaudioLayerArray();
    418. 

  418. 			$MPEGaudioBitrateLookup       = getid3_mp3::MPEGaudioBitrateArray();
    419. 

  419. 			$MPEGaudioFrequencyLookup     = getid3_mp3::MPEGaudioFrequencyArray();
    420. 

  420. 			$MPEGaudioChannelModeLookup   = getid3_mp3::MPEGaudioChannelModeArray();
    421. 

  421. 			$MPEGaudioModeExtensionLookup = getid3_mp3::MPEGaudioModeExtensionArray();
    422. 

  422. 			$MPEGaudioEmphasisLookup      = getid3_mp3::MPEGaudioEmphasisArray();
    423. 

  423. 		}
    424. 

  424. 

  425. 		if (fseek($this->getid3->fp, $offset, SEEK_SET) != 0) {
    426. 

  426. 			$info['error'][] = 'decodeMPEGaudioHeader() failed to seek to next offset at '.$offset;
    427. 

  427. 			return false;
    428. 

  428. 		}
    429. 

  429. 		//$headerstring = fread($this->getid3->fp, 1441); // worst-case max length = 32kHz @ 320kbps layer 3 = 1441 bytes/frame
    430. 

  430. 		$headerstring = fread($this->getid3->fp, 226); // LAME header at offset 36 + 190 bytes of Xing/LAME data
    431. 

  431. 

  432. 		// MP3 audio frame structure:
    433. 

  433. 		// $aa $aa $aa $aa [$bb $bb] $cc...
    434. 

  434. 		// where $aa..$aa is the four-byte mpeg-audio header (below)
    435. 

  435. 		// $bb $bb is the optional 2-byte CRC
    436. 

  436. 		// and $cc... is the audio data
    437. 

  437. 

  438. 		$head4 = substr($headerstring, 0, 4);
    439. 

  439. 

  440. 		static $MPEGaudioHeaderDecodeCache = array();
    441. 

  441. 		if (isset($MPEGaudioHeaderDecodeCache[$head4])) {
    442. 

  442. 			$MPEGheaderRawArray = $MPEGaudioHeaderDecodeCache[$head4];
    443. 

  443. 		} else {
    444. 

  444. 			$MPEGheaderRawArray = getid3_mp3::MPEGaudioHeaderDecode($head4);
    445. 

  445. 			$MPEGaudioHeaderDecodeCache[$head4] = $MPEGheaderRawArray;
    446. 

  446. 		}
    447. 

  447. 

  448. 		static $MPEGaudioHeaderValidCache = array();
    449. 

  449. 		if (!isset($MPEGaudioHeaderValidCache[$head4])) { // Not in cache
    450. 

  450. 			//$MPEGaudioHeaderValidCache[$head4] = getid3_mp3::MPEGaudioHeaderValid($MPEGheaderRawArray, false, true);  // allow badly-formatted freeformat (from LAME 3.90 - 3.93.1)
    451. 

  451. 			$MPEGaudioHeaderValidCache[$head4] = getid3_mp3::MPEGaudioHeaderValid($MPEGheaderRawArray, false, false);
    452. 

  452. 		}
    453. 

  453. 

  454. 		// shortcut
    455. 

  455. 		if (!isset($info['mpeg']['audio'])) {
    456. 

  456. 			$info['mpeg']['audio'] = array();
    457. 

  457. 		}
    458. 

  458. 		$thisfile_mpeg_audio = &$info['mpeg']['audio'];
    459. 

  459. 

  460. 

  461. 		if ($MPEGaudioHeaderValidCache[$head4]) {
    462. 

  462. 			$thisfile_mpeg_audio['raw'] = $MPEGheaderRawArray;
    463. 

  463. 		} else {
    464. 

  464. 			$info['error'][] = 'Invalid MPEG audio header ('.getid3_lib::PrintHexBytes($head4).') at offset '.$offset;
    465. 

  465. 			return false;
    466. 

  466. 		}
    467. 

  467. 

  468. 		if (!$FastMPEGheaderScan) {
    469. 

  469. 			$thisfile_mpeg_audio['version']       = $MPEGaudioVersionLookup[$thisfile_mpeg_audio['raw']['version']];
    470. 

  470. 			$thisfile_mpeg_audio['layer']         = $MPEGaudioLayerLookup[$thisfile_mpeg_audio['raw']['layer']];
    471. 

  471. 

  472. 			$thisfile_mpeg_audio['channelmode']   = $MPEGaudioChannelModeLookup[$thisfile_mpeg_audio['raw']['channelmode']];
    473. 

  473. 			$thisfile_mpeg_audio['channels']      = (($thisfile_mpeg_audio['channelmode'] == 'mono') ? 1 : 2);
    474. 

  474. 			$thisfile_mpeg_audio['sample_rate']   = $MPEGaudioFrequencyLookup[$thisfile_mpeg_audio['version']][$thisfile_mpeg_audio['raw']['sample_rate']];
    475. 

  475. 			$thisfile_mpeg_audio['protection']    = !$thisfile_mpeg_audio['raw']['protection'];
    476. 

  476. 			$thisfile_mpeg_audio['private']       = (bool) $thisfile_mpeg_audio['raw']['private'];
    477. 

  477. 			$thisfile_mpeg_audio['modeextension'] = $MPEGaudioModeExtensionLookup[$thisfile_mpeg_audio['layer']][$thisfile_mpeg_audio['raw']['modeextension']];
    478. 

  478. 			$thisfile_mpeg_audio['copyright']     = (bool) $thisfile_mpeg_audio['raw']['copyright'];
    479. 

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

  480. 			$thisfile_mpeg_audio['emphasis']      = $MPEGaudioEmphasisLookup[$thisfile_mpeg_audio['raw']['emphasis']];
    481. 

  481. 

  482. 			$info['audio']['channels']    = $thisfile_mpeg_audio['channels'];
    483. 

  483. 			$info['audio']['sample_rate'] = $thisfile_mpeg_audio['sample_rate'];
    484. 

  484. 

  485. 			if ($thisfile_mpeg_audio['protection']) {
    486. 

  486. 				$thisfile_mpeg_audio['crc'] = getid3_lib::BigEndian2Int(substr($headerstring, 4, 2));
    487. 

  487. 			}
    488. 

  488. 		}
    489. 

  489. 

  490. 		if ($thisfile_mpeg_audio['raw']['bitrate'] == 15) {
    491. 

  491. 			// http://www.hydrogenaudio.org/?act=ST&f=16&t=9682&st=0
    492. 

  492. 			$info['warning'][] = 'Invalid bitrate index (15), this is a known bug in free-format MP3s encoded by LAME v3.90 - 3.93.1';
    493. 

  493. 			$thisfile_mpeg_audio['raw']['bitrate'] = 0;
    494. 

  494. 		}
    495. 

  495. 		$thisfile_mpeg_audio['padding'] = (bool) $thisfile_mpeg_audio['raw']['padding'];
    496. 

  496. 		$thisfile_mpeg_audio['bitrate'] = $MPEGaudioBitrateLookup[$thisfile_mpeg_audio['version']][$thisfile_mpeg_audio['layer']][$thisfile_mpeg_audio['raw']['bitrate']];
    497. 

  497. 

  498. 		if (($thisfile_mpeg_audio['bitrate'] == 'free') && ($offset == $info['avdataoffset'])) {
    499. 

  499. 			// only skip multiple frame check if free-format bitstream found at beginning of file
    500. 

  500. 			// otherwise is quite possibly simply corrupted data
    501. 

  501. 			$recursivesearch = false;
    502. 

  502. 		}
    503. 

  503. 

  504. 		// For Layer 2 there are some combinations of bitrate and mode which are not allowed.
    505. 

  505. 		if (!$FastMPEGheaderScan && ($thisfile_mpeg_audio['layer'] == '2')) {
    506. 

  506. 

  507. 			$info['audio']['dataformat'] = 'mp2';
    508. 

  508. 			switch ($thisfile_mpeg_audio['channelmode']) {
    509. 

  509. 

  510. 				case 'mono':
    511. 

  511. 					if (($thisfile_mpeg_audio['bitrate'] == 'free') || ($thisfile_mpeg_audio['bitrate'] <= 192000)) {
    512. 

  512. 						// these are ok
    513. 

  513. 					} else {
    514. 

  514. 						$info['error'][] = $thisfile_mpeg_audio['bitrate'].'kbps not allowed in Layer 2, '.$thisfile_mpeg_audio['channelmode'].'.';
    515. 

  515. 						return false;
    516. 

  516. 					}
    517. 

  517. 					break;
    518. 

  518. 

  519. 				case 'stereo':
    520. 

  520. 				case 'joint stereo':
    521. 

  521. 				case 'dual channel':
    522. 

  522. 					if (($thisfile_mpeg_audio['bitrate'] == 'free') || ($thisfile_mpeg_audio['bitrate'] == 64000) || ($thisfile_mpeg_audio['bitrate'] >= 96000)) {
    523. 

  523. 						// these are ok
    524. 

  524. 					} else {
    525. 

  525. 						$info['error'][] = intval(round($thisfile_mpeg_audio['bitrate'] / 1000)).'kbps not allowed in Layer 2, '.$thisfile_mpeg_audio['channelmode'].'.';
    526. 

  526. 						return false;
    527. 

  527. 					}
    528. 

  528. 					break;
    529. 

  529. 

  530. 			}
    531. 

  531. 

  532. 		}
    533. 

  533. 

  534. 

  535. 		if ($info['audio']['sample_rate'] > 0) {
    536. 

  536. 			$thisfile_mpeg_audio['framelength'] = getid3_mp3::MPEGaudioFrameLength($thisfile_mpeg_audio['bitrate'], $thisfile_mpeg_audio['version'], $thisfile_mpeg_audio['layer'], (int) $thisfile_mpeg_audio['padding'], $info['audio']['sample_rate']);
    537. 

  537. 		}
    538. 

  538. 

  539. 		$nextframetestoffset = $offset + 1;
    540. 

  540. 		if ($thisfile_mpeg_audio['bitrate'] != 'free') {
    541. 

  541. 

  542. 			$info['audio']['bitrate'] = $thisfile_mpeg_audio['bitrate'];
    543. 

  543. 

  544. 			if (isset($thisfile_mpeg_audio['framelength'])) {
    545. 

  545. 				$nextframetestoffset = $offset + $thisfile_mpeg_audio['framelength'];
    546. 

  546. 			} else {
    547. 

  547. 				$info['error'][] = 'Frame at offset('.$offset.') is has an invalid frame length.';
    548. 

  548. 				return false;
    549. 

  549. 			}
    550. 

  550. 

  551. 		}
    552. 

  552. 

  553. 		$ExpectedNumberOfAudioBytes = 0;
    554. 

  554. 

  555. 		////////////////////////////////////////////////////////////////////////////////////
    556. 

  556. 		// Variable-bitrate headers
    557. 

  557. 

  558. 		if (substr($headerstring, 4 + 32, 4) == 'VBRI') {
    559. 

  559. 			// Fraunhofer VBR header is hardcoded 'VBRI' at offset 0x24 (36)
    560. 

  560. 			// specs taken from http://minnie.tuhs.org/pipermail/mp3encoder/2001-January/001800.html
    561. 

  561. 

  562. 			$thisfile_mpeg_audio['bitrate_mode'] = 'vbr';
    563. 

  563. 			$thisfile_mpeg_audio['VBR_method']   = 'Fraunhofer';
    564. 

  564. 			$info['audio']['codec']                = 'Fraunhofer';
    565. 

  565. 

  566. 			$SideInfoData = substr($headerstring, 4 + 2, 32);
    567. 

  567. 

  568. 			$FraunhoferVBROffset = 36;
    569. 

  569. 

  570. 			$thisfile_mpeg_audio['VBR_encoder_version']     = getid3_lib::BigEndian2Int(substr($headerstring, $FraunhoferVBROffset +  4, 2)); // VbriVersion
    571. 

  571. 			$thisfile_mpeg_audio['VBR_encoder_delay']       = getid3_lib::BigEndian2Int(substr($headerstring, $FraunhoferVBROffset +  6, 2)); // VbriDelay
    572. 

  572. 			$thisfile_mpeg_audio['VBR_quality']             = getid3_lib::BigEndian2Int(substr($headerstring, $FraunhoferVBROffset +  8, 2)); // VbriQuality
    573. 

  573. 			$thisfile_mpeg_audio['VBR_bytes']               = getid3_lib::BigEndian2Int(substr($headerstring, $FraunhoferVBROffset + 10, 4)); // VbriStreamBytes
    574. 

  574. 			$thisfile_mpeg_audio['VBR_frames']              = getid3_lib::BigEndian2Int(substr($headerstring, $FraunhoferVBROffset + 14, 4)); // VbriStreamFrames
    575. 

  575. 			$thisfile_mpeg_audio['VBR_seek_offsets']        = getid3_lib::BigEndian2Int(substr($headerstring, $FraunhoferVBROffset + 18, 2)); // VbriTableSize
    576. 

  576. 			$thisfile_mpeg_audio['VBR_seek_scale']          = getid3_lib::BigEndian2Int(substr($headerstring, $FraunhoferVBROffset + 20, 2)); // VbriTableScale
    577. 

  577. 			$thisfile_mpeg_audio['VBR_entry_bytes']         = getid3_lib::BigEndian2Int(substr($headerstring, $FraunhoferVBROffset + 22, 2)); // VbriEntryBytes
    578. 

  578. 			$thisfile_mpeg_audio['VBR_entry_frames']        = getid3_lib::BigEndian2Int(substr($headerstring, $FraunhoferVBROffset + 24, 2)); // VbriEntryFrames
    579. 

  579. 

  580. 			$ExpectedNumberOfAudioBytes = $thisfile_mpeg_audio['VBR_bytes'];
    581. 

  581. 

  582. 			$previousbyteoffset = $offset;
    583. 

  583. 			for ($i = 0; $i < $thisfile_mpeg_audio['VBR_seek_offsets']; $i++) {
    584. 

  584. 				$Fraunhofer_OffsetN = getid3_lib::BigEndian2Int(substr($headerstring, $FraunhoferVBROffset, $thisfile_mpeg_audio['VBR_entry_bytes']));
    585. 

  585. 				$FraunhoferVBROffset += $thisfile_mpeg_audio['VBR_entry_bytes'];
    586. 

  586. 				$thisfile_mpeg_audio['VBR_offsets_relative'][$i] = ($Fraunhofer_OffsetN * $thisfile_mpeg_audio['VBR_seek_scale']);
    587. 

  587. 				$thisfile_mpeg_audio['VBR_offsets_absolute'][$i] = ($Fraunhofer_OffsetN * $thisfile_mpeg_audio['VBR_seek_scale']) + $previousbyteoffset;
    588. 

  588. 				$previousbyteoffset += $Fraunhofer_OffsetN;
    589. 

  589. 			}
    590. 

  590. 

  591. 

  592. 		} else {
    593. 

  593. 

  594. 			// Xing VBR header is hardcoded 'Xing' at a offset 0x0D (13), 0x15 (21) or 0x24 (36)
    595. 

  595. 			// depending on MPEG layer and number of channels
    596. 

  596. 

  597. 			$VBRidOffset = getid3_mp3::XingVBRidOffset($thisfile_mpeg_audio['version'], $thisfile_mpeg_audio['channelmode']);
    598. 

  598. 			$SideInfoData = substr($headerstring, 4 + 2, $VBRidOffset - 4);
    599. 

  599. 

  600. 			if ((substr($headerstring, $VBRidOffset, strlen('Xing')) == 'Xing') || (substr($headerstring, $VBRidOffset, strlen('Info')) == 'Info')) {
    601. 

  601. 				// 'Xing' is traditional Xing VBR frame
    602. 

  602. 				// 'Info' is LAME-encoded CBR (This was done to avoid CBR files to be recognized as traditional Xing VBR files by some decoders.)
    603. 

  603. 				// 'Info' *can* legally be used to specify a VBR file as well, however.
    604. 

  604. 

  605. 				// http://www.multiweb.cz/twoinches/MP3inside.htm
    606. 

  606. 				//00..03 = "Xing" or "Info"
    607. 

  607. 				//04..07 = Flags:
    608. 

  608. 				//  0x01  Frames Flag     set if value for number of frames in file is stored
    609. 

  609. 				//  0x02  Bytes Flag      set if value for filesize in bytes is stored
    610. 

  610. 				//  0x04  TOC Flag        set if values for TOC are stored
    611. 

  611. 				//  0x08  VBR Scale Flag  set if values for VBR scale is stored
    612. 

  612. 				//08..11  Frames: Number of frames in file (including the first Xing/Info one)
    613. 

  613. 				//12..15  Bytes:  File length in Bytes
    614. 

  614. 				//16..115  TOC (Table of Contents):
    615. 

  615. 				//  Contains of 100 indexes (one Byte length) for easier lookup in file. Approximately solves problem with moving inside file.
    616. 

  616. 				//  Each Byte has a value according this formula:
    617. 

  617. 				//  (TOC[i] / 256) * fileLenInBytes
    618. 

  618. 				//  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:
    619. 

  619. 				//  TOC[(60/240)*100] = TOC[25]
    620. 

  620. 				//  and corresponding Byte in file is then approximately at:
    621. 

  621. 				//  (TOC[25]/256) * 5000000
    622. 

  622. 				//116..119  VBR Scale
    623. 

  623. 

  624. 

  625. 				// should be safe to leave this at 'vbr' and let it be overriden to 'cbr' if a CBR preset/mode is used by LAME
    626. 

  626. //				if (substr($headerstring, $VBRidOffset, strlen('Info')) == 'Xing') {
    627. 

  627. 					$thisfile_mpeg_audio['bitrate_mode'] = 'vbr';
    628. 

  628. 					$thisfile_mpeg_audio['VBR_method']   = 'Xing';
    629. 

  629. //				} else {
    630. 

  630. //					$ScanAsCBR = true;
    631. 

  631. //					$thisfile_mpeg_audio['bitrate_mode'] = 'cbr';
    632. 

  632. //				}
    633. 

  633. 

  634. 				$thisfile_mpeg_audio['xing_flags_raw'] = getid3_lib::BigEndian2Int(substr($headerstring, $VBRidOffset + 4, 4));
    635. 

  635. 

  636. 				$thisfile_mpeg_audio['xing_flags']['frames']    = (bool) ($thisfile_mpeg_audio['xing_flags_raw'] & 0x00000001);
    637. 

  637. 				$thisfile_mpeg_audio['xing_flags']['bytes']     = (bool) ($thisfile_mpeg_audio['xing_flags_raw'] & 0x00000002);
    638. 

  638. 				$thisfile_mpeg_audio['xing_flags']['toc']       = (bool) ($thisfile_mpeg_audio['xing_flags_raw'] & 0x00000004);
    639. 

  639. 				$thisfile_mpeg_audio['xing_flags']['vbr_scale'] = (bool) ($thisfile_mpeg_audio['xing_flags_raw'] & 0x00000008);
    640. 

  640. 

  641. 				if ($thisfile_mpeg_audio['xing_flags']['frames']) {
    642. 

  642. 					$thisfile_mpeg_audio['VBR_frames'] = getid3_lib::BigEndian2Int(substr($headerstring, $VBRidOffset +  8, 4));
    643. 

  643. 					//$thisfile_mpeg_audio['VBR_frames']--; // don't count header Xing/Info frame
    644. 

  644. 				}
    645. 

  645. 				if ($thisfile_mpeg_audio['xing_flags']['bytes']) {
    646. 

  646. 					$thisfile_mpeg_audio['VBR_bytes']  = getid3_lib::BigEndian2Int(substr($headerstring, $VBRidOffset + 12, 4));
    647. 

  647. 				}
    648. 

  648. 

  649. 				//if (($thisfile_mpeg_audio['bitrate'] == 'free') && !empty($thisfile_mpeg_audio['VBR_frames']) && !empty($thisfile_mpeg_audio['VBR_bytes'])) {
    650. 

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

  651. 

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

  653. 

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

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

  656. 						//$info['audio']['bitrate'] = ((($framelengthfloat / 4) - intval($thisfile_mpeg_audio['padding'])) * $thisfile_mpeg_audio['sample_rate']) / 12;
    657. 

  657. 						$info['audio']['bitrate'] = ($framelengthfloat / 4) * $thisfile_mpeg_audio['sample_rate'] * (2 / $info['audio']['channels']) / 12;
    658. 

  658. 					} else {
    659. 

  659. 						// Bitrate = ((FrameLengthInBytes - Padding) * SampleRate) / 144
    660. 

  660. 						//$info['audio']['bitrate'] = (($framelengthfloat - intval($thisfile_mpeg_audio['padding'])) * $thisfile_mpeg_audio['sample_rate']) / 144;
    661. 

  661. 						$info['audio']['bitrate'] = $framelengthfloat * $thisfile_mpeg_audio['sample_rate'] * (2 / $info['audio']['channels']) / 144;
    662. 

  662. 					}
    663. 

  663. 					$thisfile_mpeg_audio['framelength'] = floor($framelengthfloat);
    664. 

  664. 				}
    665. 

  665. 

  666. 				if ($thisfile_mpeg_audio['xing_flags']['toc']) {
    667. 

  667. 					$LAMEtocData = substr($headerstring, $VBRidOffset + 16, 100);
    668. 

  668. 					for ($i = 0; $i < 100; $i++) {
    669. 

  669. 						$thisfile_mpeg_audio['toc'][$i] = ord($LAMEtocData{$i});
    670. 

  670. 					}
    671. 

  671. 				}
    672. 

  672. 				if ($thisfile_mpeg_audio['xing_flags']['vbr_scale']) {
    673. 

  673. 					$thisfile_mpeg_audio['VBR_scale'] = getid3_lib::BigEndian2Int(substr($headerstring, $VBRidOffset + 116, 4));
    674. 

  674. 				}
    675. 

  675. 

  676. 

  677. 				// http://gabriel.mp3-tech.org/mp3infotag.html
    678. 

  678. 				if (substr($headerstring, $VBRidOffset + 120, 4) == 'LAME') {
    679. 

  679. 

  680. 					// shortcut
    681. 

  681. 					$thisfile_mpeg_audio['LAME'] = array();
    682. 

  682. 					$thisfile_mpeg_audio_lame    = &$thisfile_mpeg_audio['LAME'];
    683. 

  683. 

  684. 

  685. 					$thisfile_mpeg_audio_lame['long_version']  = substr($headerstring, $VBRidOffset + 120, 20);
    686. 

  686. 					$thisfile_mpeg_audio_lame['short_version'] = substr($thisfile_mpeg_audio_lame['long_version'], 0, 9);
    687. 

  687. 

  688. 					if ($thisfile_mpeg_audio_lame['short_version'] >= 'LAME3.90') {
    689. 

  689. 

  690. 						// extra 11 chars are not part of version string when LAMEtag present
    691. 

  691. 						unset($thisfile_mpeg_audio_lame['long_version']);
    692. 

  692. 

  693. 						// It the LAME tag was only introduced in LAME v3.90
    694. 

  694. 						// http://www.hydrogenaudio.org/?act=ST&f=15&t=9933
    695. 

  695. 

  696. 						// Offsets of various bytes in http://gabriel.mp3-tech.org/mp3infotag.html
    697. 

  697. 						// are assuming a 'Xing' identifier offset of 0x24, which is the case for
    698. 

  698. 						// MPEG-1 non-mono, but not for other combinations
    699. 

  699. 						$LAMEtagOffsetContant = $VBRidOffset - 0x24;
    700. 

  700. 

  701. 						// shortcuts
    702. 

  702. 						$thisfile_mpeg_audio_lame['RGAD']    = array('track'=>array(), 'album'=>array());
    703. 

  703. 						$thisfile_mpeg_audio_lame_RGAD       = &$thisfile_mpeg_audio_lame['RGAD'];
    704. 

  704. 						$thisfile_mpeg_audio_lame_RGAD_track = &$thisfile_mpeg_audio_lame_RGAD['track'];
    705. 

  705. 						$thisfile_mpeg_audio_lame_RGAD_album = &$thisfile_mpeg_audio_lame_RGAD['album'];
    706. 

  706. 						$thisfile_mpeg_audio_lame['raw'] = array();
    707. 

  707. 						$thisfile_mpeg_audio_lame_raw    = &$thisfile_mpeg_audio_lame['raw'];
    708. 

  708. 

  709. 						// byte $9B  VBR Quality
    710. 

  710. 						// This field is there to indicate a quality level, although the scale was not precised in the original Xing specifications.
    711. 

  711. 						// Actually overwrites original Xing bytes
    712. 

  712. 						unset($thisfile_mpeg_audio['VBR_scale']);
    713. 

  713. 						$thisfile_mpeg_audio_lame['vbr_quality'] = getid3_lib::BigEndian2Int(substr($headerstring, $LAMEtagOffsetContant + 0x9B, 1));
    714. 

  714. 

  715. 						// bytes $9C-$A4  Encoder short VersionString
    716. 

  716. 						$thisfile_mpeg_audio_lame['short_version'] = substr($headerstring, $LAMEtagOffsetContant + 0x9C, 9);
    717. 

  717. 

  718. 						// byte $A5  Info Tag revision + VBR method
    719. 

  719. 						$LAMEtagRevisionVBRmethod = getid3_lib::BigEndian2Int(substr($headerstring, $LAMEtagOffsetContant + 0xA5, 1));
    720. 

  720. 

  721. 						$thisfile_mpeg_audio_lame['tag_revision']   = ($LAMEtagRevisionVBRmethod & 0xF0) >> 4;
    722. 

  722. 						$thisfile_mpeg_audio_lame_raw['vbr_method'] =  $LAMEtagRevisionVBRmethod & 0x0F;
    723. 

  723. 						$thisfile_mpeg_audio_lame['vbr_method']     = getid3_mp3::LAMEvbrMethodLookup($thisfile_mpeg_audio_lame_raw['vbr_method']);
    724. 

  724. 						$thisfile_mpeg_audio['bitrate_mode']        = substr($thisfile_mpeg_audio_lame['vbr_method'], 0, 3); // usually either 'cbr' or 'vbr', but truncates 'vbr-old / vbr-rh' to 'vbr'
    725. 

  725. 

  726. 						// byte $A6  Lowpass filter value
    727. 

  727. 						$thisfile_mpeg_audio_lame['lowpass_frequency'] = getid3_lib::BigEndian2Int(substr($headerstring, $LAMEtagOffsetContant + 0xA6, 1)) * 100;
    728. 

  728. 

  729. 						// bytes $A7-$AE  Replay Gain
    730. 

  730. 						// http://privatewww.essex.ac.uk/~djmrob/replaygain/rg_data_format.html
    731. 

  731. 						// bytes $A7-$AA : 32 bit floating point "Peak signal amplitude"
    732. 

  732. 						if ($thisfile_mpeg_audio_lame['short_version'] >= 'LAME3.94b') {
    733. 

  733. 							// LAME 3.94a16 and later - 9.23 fixed point
    734. 

  734. 							// ie 0x0059E2EE / (2^23) = 5890798 / 8388608 = 0.7022378444671630859375
    735. 

  735. 							$thisfile_mpeg_audio_lame_RGAD['peak_amplitude'] = (float) ((getid3_lib::BigEndian2Int(substr($headerstring, $LAMEtagOffsetContant + 0xA7, 4))) / 8388608);
    736. 

  736. 						} else {
    737. 

  737. 							// LAME 3.94a15 and earlier - 32-bit floating point
    738. 

  738. 							// Actually 3.94a16 will fall in here too and be WRONG, but is hard to detect 3.94a16 vs 3.94a15
    739. 

  739. 							$thisfile_mpeg_audio_lame_RGAD['peak_amplitude'] = getid3_lib::LittleEndian2Float(substr($headerstring, $LAMEtagOffsetContant + 0xA7, 4));
    740. 

  740. 						}
    741. 

  741. 						if ($thisfile_mpeg_audio_lame_RGAD['peak_amplitude'] == 0) {
    742. 

  742. 							unset($thisfile_mpeg_audio_lame_RGAD['peak_amplitude']);
    743. 

  743. 						} else {
    744. 

  744. 							$thisfile_mpeg_audio_lame_RGAD['peak_db'] = getid3_lib::RGADamplitude2dB($thisfile_mpeg_audio_lame_RGAD['peak_amplitude']);
    745. 

  745. 						}
    746. 

  746. 

  747. 						$thisfile_mpeg_audio_lame_raw['RGAD_track']      =   getid3_lib::BigEndian2Int(substr($headerstring, $LAMEtagOffsetContant + 0xAB, 2));
    748. 

  748. 						$thisfile_mpeg_audio_lame_raw['RGAD_album']      =   getid3_lib::BigEndian2Int(substr($headerstring, $LAMEtagOffsetContant + 0xAD, 2));
    749. 

  749. 

  750. 

  751. 						if ($thisfile_mpeg_audio_lame_raw['RGAD_track'] != 0) {
    752. 

  752. 

  753. 							$thisfile_mpeg_audio_lame_RGAD_track['raw']['name']        = ($thisfile_mpeg_audio_lame_raw['RGAD_track'] & 0xE000) >> 13;
    754. 

  754. 							$thisfile_mpeg_audio_lame_RGAD_track['raw']['originator']  = ($thisfile_mpeg_audio_lame_raw['RGAD_track'] & 0x1C00) >> 10;
    755. 

  755. 							$thisfile_mpeg_audio_lame_RGAD_track['raw']['sign_bit']    = ($thisfile_mpeg_audio_lame_raw['RGAD_track'] & 0x0200) >> 9;
    756. 

  756. 							$thisfile_mpeg_audio_lame_RGAD_track['raw']['gain_adjust'] =  $thisfile_mpeg_audio_lame_raw['RGAD_track'] & 0x01FF;
    757. 

  757. 							$thisfile_mpeg_audio_lame_RGAD_track['name']       = getid3_lib::RGADnameLookup($thisfile_mpeg_audio_lame_RGAD_track['raw']['name']);
    758. 

  758. 							$thisfile_mpeg_audio_lame_RGAD_track['originator'] = getid3_lib::RGADoriginatorLookup($thisfile_mpeg_audio_lame_RGAD_track['raw']['originator']);
    759. 

  759. 							$thisfile_mpeg_audio_lame_RGAD_track['gain_db']    = getid3_lib::RGADadjustmentLookup($thisfile_mpeg_audio_lame_RGAD_track['raw']['gain_adjust'], $thisfile_mpeg_audio_lame_RGAD_track['raw']['sign_bit']);
    760. 

  760. 

  761. 							if (!empty($thisfile_mpeg_audio_lame_RGAD['peak_amplitude'])) {
    762. 

  762. 								$info['replay_gain']['track']['peak']   = $thisfile_mpeg_audio_lame_RGAD['peak_amplitude'];
    763. 

  763. 							}
    764. 

  764. 							$info['replay_gain']['track']['originator'] = $thisfile_mpeg_audio_lame_RGAD_track['originator'];
    765. 

  765. 							$info['replay_gain']['track']['adjustment'] = $thisfile_mpeg_audio_lame_RGAD_track['gain_db'];
    766. 

  766. 						} else {
    767. 

  767. 							unset($thisfile_mpeg_audio_lame_RGAD['track']);
    768. 

  768. 						}
    769. 

  769. 						if ($thisfile_mpeg_audio_lame_raw['RGAD_album'] != 0) {
    770. 

  770. 

  771. 							$thisfile_mpeg_audio_lame_RGAD_album['raw']['name']        = ($thisfile_mpeg_audio_lame_raw['RGAD_album'] & 0xE000) >> 13;
    772. 

  772. 							$thisfile_mpeg_audio_lame_RGAD_album['raw']['originator']  = ($thisfile_mpeg_audio_lame_raw['RGAD_album'] & 0x1C00) >> 10;
    773. 

  773. 							$thisfile_mpeg_audio_lame_RGAD_album['raw']['sign_bit']    = ($thisfile_mpeg_audio_lame_raw['RGAD_album'] & 0x0200) >> 9;
    774. 

  774. 							$thisfile_mpeg_audio_lame_RGAD_album['raw']['gain_adjust'] = $thisfile_mpeg_audio_lame_raw['RGAD_album'] & 0x01FF;
    775. 

  775. 							$thisfile_mpeg_audio_lame_RGAD_album['name']       = getid3_lib::RGADnameLookup($thisfile_mpeg_audio_lame_RGAD_album['raw']['name']);
    776. 

  776. 							$thisfile_mpeg_audio_lame_RGAD_album['originator'] = getid3_lib::RGADoriginatorLookup($thisfile_mpeg_audio_lame_RGAD_album['raw']['originator']);
    777. 

  777. 							$thisfile_mpeg_audio_lame_RGAD_album['gain_db']    = getid3_lib::RGADadjustmentLookup($thisfile_mpeg_audio_lame_RGAD_album['raw']['gain_adjust'], $thisfile_mpeg_audio_lame_RGAD_album['raw']['sign_bit']);
    778. 

  778. 

  779. 							if (!empty($thisfile_mpeg_audio_lame_RGAD['peak_amplitude'])) {
    780. 

  780. 								$info['replay_gain']['album']['peak']   = $thisfile_mpeg_audio_lame_RGAD['peak_amplitude'];
    781. 

  781. 							}
    782. 

  782. 							$info['replay_gain']['album']['originator'] = $thisfile_mpeg_audio_lame_RGAD_album['originator'];
    783. 

  783. 							$info['replay_gain']['album']['adjustment'] = $thisfile_mpeg_audio_lame_RGAD_album['gain_db'];
    784. 

  784. 						} else {
    785. 

  785. 							unset($thisfile_mpeg_audio_lame_RGAD['album']);
    786. 

  786. 						}
    787. 

  787. 						if (empty($thisfile_mpeg_audio_lame_RGAD)) {
    788. 

  788. 							unset($thisfile_mpeg_audio_lame['RGAD']);
    789. 

  789. 						}
    790. 

  790. 

  791. 

  792. 						// byte $AF  Encoding flags + ATH Type
    793. 

  793. 						$EncodingFlagsATHtype = getid3_lib::BigEndian2Int(substr($headerstring, $LAMEtagOffsetContant + 0xAF, 1));
    794. 

  794. 						$thisfile_mpeg_audio_lame['encoding_flags']['nspsytune']   = (bool) ($EncodingFlagsATHtype & 0x10);
    795. 

  795. 						$thisfile_mpeg_audio_lame['encoding_flags']['nssafejoint'] = (bool) ($EncodingFlagsATHtype & 0x20);
    796. 

  796. 						$thisfile_mpeg_audio_lame['encoding_flags']['nogap_next']  = (bool) ($EncodingFlagsATHtype & 0x40);
    797. 

  797. 						$thisfile_mpeg_audio_lame['encoding_flags']['nogap_prev']  = (bool) ($EncodingFlagsATHtype & 0x80);
    798. 

  798. 						$thisfile_mpeg_audio_lame['ath_type']                      =         $EncodingFlagsATHtype & 0x0F;
    799. 

  799. 

  800. 						// byte $B0  if ABR {specified bitrate} else {minimal bitrate}
    801. 

  801. 						$thisfile_mpeg_audio_lame['raw']['abrbitrate_minbitrate'] = getid3_lib::BigEndian2Int(substr($headerstring, $LAMEtagOffsetContant + 0xB0, 1));
    802. 

  802. 						if ($thisfile_mpeg_audio_lame_raw['vbr_method'] == 2) { // Average BitRate (ABR)
    803. 

  803. 							$thisfile_mpeg_audio_lame['bitrate_abr'] = $thisfile_mpeg_audio_lame['raw']['abrbitrate_minbitrate'];
    804. 

  804. 						} elseif ($thisfile_mpeg_audio_lame_raw['vbr_method'] == 1) { // Constant BitRate (CBR)
    805. 

  805. 							// ignore
    806. 

  806. 						} elseif ($thisfile_mpeg_audio_lame['raw']['abrbitrate_minbitrate'] > 0) { // Variable BitRate (VBR) - minimum bitrate
    807. 

  807. 							$thisfile_mpeg_audio_lame['bitrate_min'] = $thisfile_mpeg_audio_lame['raw']['abrbitrate_minbitrate'];
    808. 

  808. 						}
    809. 

  809. 

  810. 						// bytes $B1-$B3  Encoder delays
    811. 

  811. 						$EncoderDelays = getid3_lib::BigEndian2Int(substr($headerstring, $LAMEtagOffsetContant + 0xB1, 3));
    812. 

  812. 						$thisfile_mpeg_audio_lame['encoder_delay'] = ($EncoderDelays & 0xFFF000) >> 12;
    813. 

  813. 						$thisfile_mpeg_audio_lame['end_padding']   =  $EncoderDelays & 0x000FFF;
    814. 

  814. 

  815. 						// byte $B4  Misc
    816. 

  816. 						$MiscByte = getid3_lib::BigEndian2Int(substr($headerstring, $LAMEtagOffsetContant + 0xB4, 1));
    817. 

  817. 						$thisfile_mpeg_audio_lame_raw['noise_shaping']       = ($MiscByte & 0x03);
    818. 

  818. 						$thisfile_mpeg_audio_lame_raw['stereo_mode']         = ($MiscByte & 0x1C) >> 2;
    819. 

  819. 						$thisfile_mpeg_audio_lame_raw['not_optimal_quality'] = ($MiscByte & 0x20) >> 5;
    820. 

  820. 						$thisfile_mpeg_audio_lame_raw['source_sample_freq']  = ($MiscByte & 0xC0) >> 6;
    821. 

  821. 						$thisfile_mpeg_audio_lame['noise_shaping']       = $thisfile_mpeg_audio_lame_raw['noise_shaping'];
    822. 

  822. 						$thisfile_mpeg_audio_lame['stereo_mode']         = getid3_mp3::LAMEmiscStereoModeLookup($thisfile_mpeg_audio_lame_raw['stereo_mode']);
    823. 

  823. 						$thisfile_mpeg_audio_lame['not_optimal_quality'] = (bool) $thisfile_mpeg_audio_lame_raw['not_optimal_quality'];
    824. 

  824. 						$thisfile_mpeg_audio_lame['source_sample_freq']  = getid3_mp3::LAMEmiscSourceSampleFrequencyLookup($thisfile_mpeg_audio_lame_raw['source_sample_freq']);
    825. 

  825. 

  826. 						// byte $B5  MP3 Gain
    827. 

  827. 						$thisfile_mpeg_audio_lame_raw['mp3_gain'] = getid3_lib::BigEndian2Int(substr($headerstring, $LAMEtagOffsetContant + 0xB5, 1), false, true);
    828. 

  828. 						$thisfile_mpeg_audio_lame['mp3_gain_db']     = (getid3_lib::RGADamplitude2dB(2) / 4) * $thisfile_mpeg_audio_lame_raw['mp3_gain'];
    829. 

  829. 						$thisfile_mpeg_audio_lame['mp3_gain_factor'] = pow(2, ($thisfile_mpeg_audio_lame['mp3_gain_db'] / 6));
    830. 

  830. 

  831. 						// bytes $B6-$B7  Preset and surround info
    832. 

  832. 						$PresetSurroundBytes = getid3_lib::BigEndian2Int(substr($headerstring, $LAMEtagOffsetContant + 0xB6, 2));
    833. 

  833. 						// Reserved                                                    = ($PresetSurroundBytes & 0xC000);
    834. 

  834. 						$thisfile_mpeg_audio_lame_raw['surround_info'] = ($PresetSurroundBytes & 0x3800);
    835. 

  835. 						$thisfile_mpeg_audio_lame['surround_info']     = getid3_mp3::LAMEsurroundInfoLookup($thisfile_mpeg_audio_lame_raw['surround_info']);
    836. 

  836. 						$thisfile_mpeg_audio_lame['preset_used_id']    = ($PresetSurroundBytes & 0x07FF);
    837. 

  837. 						$thisfile_mpeg_audio_lame['preset_used']       = getid3_mp3::LAMEpresetUsedLookup($thisfile_mpeg_audio_lame);
    838. 

  838. 						if (!empty($thisfile_mpeg_audio_lame['preset_used_id']) && empty($thisfile_mpeg_audio_lame['preset_used'])) {
    839. 

  839. 							$info['warning'][] = 'Unknown LAME preset used ('.$thisfile_mpeg_audio_lame['preset_used_id'].') - please report to info@getid3.org';
    840. 

  840. 						}
    841. 

  841. 						if (($thisfile_mpeg_audio_lame['short_version'] == 'LAME3.90.') && !empty($thisfile_mpeg_audio_lame['preset_used_id'])) {
    842. 

  842. 							// this may change if 3.90.4 ever comes out
    843. 

  843. 							$thisfile_mpeg_audio_lame['short_version'] = 'LAME3.90.3';
    844. 

  844. 						}
    845. 

  845. 

  846. 						// bytes $B8-$BB  MusicLength
    847. 

  847. 						$thisfile_mpeg_audio_lame['audio_bytes'] = getid3_lib::BigEndian2Int(substr($headerstring, $LAMEtagOffsetContant + 0xB8, 4));
    848. 

  848. 						$ExpectedNumberOfAudioBytes = (($thisfile_mpeg_audio_lame['audio_bytes'] > 0) ? $thisfile_mpeg_audio_lame['audio_bytes'] : $thisfile_mpeg_audio['VBR_bytes']);
    849. 

  849. 

  850. 						// bytes $BC-$BD  MusicCRC
    851. 

  851. 						$thisfile_mpeg_audio_lame['music_crc']    = getid3_lib::BigEndian2Int(substr($headerstring, $LAMEtagOffsetContant + 0xBC, 2));
    852. 

  852. 

  853. 						// bytes $BE-$BF  CRC-16 of Info Tag
    854. 

  854. 						$thisfile_mpeg_audio_lame['lame_tag_crc'] = getid3_lib::BigEndian2Int(substr($headerstring, $LAMEtagOffsetContant + 0xBE, 2));
    855. 

  855. 

  856. 

  857. 						// LAME CBR
    858. 

  858. 						if ($thisfile_mpeg_audio_lame_raw['vbr_method'] == 1) {
    859. 

  859. 

  860. 							$thisfile_mpeg_audio['bitrate_mode'] = 'cbr';
    861. 

  861. 							$thisfile_mpeg_audio['bitrate'] = getid3_mp3::ClosestStandardMP3Bitrate($thisfile_mpeg_audio['bitrate']);
    862. 

  862. 							$info['audio']['bitrate'] = $thisfile_mpeg_audio['bitrate'];
    863. 

  863. 							//if (empty($thisfile_mpeg_audio['bitrate']) || (!empty($thisfile_mpeg_audio_lame['bitrate_min']) && ($thisfile_mpeg_audio_lame['bitrate_min'] != 255))) {
    864. 

  864. 							//	$thisfile_mpeg_audio['bitrate'] = $thisfile_mpeg_audio_lame['bitrate_min'];
    865. 

  865. 							//}
    866. 

  866. 

  867. 						}
    868. 

  868. 

  869. 					}
    870. 

  870. 				}
    871. 

  871. 

  872. 			} else {
    873. 

  873. 

  874. 				// not Fraunhofer or Xing VBR methods, most likely CBR (but could be VBR with no header)
    875. 

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

  876. 				if ($recursivesearch) {
    877. 

  877. 					$thisfile_mpeg_audio['bitrate_mode'] = 'vbr';
    878. 

  878. 					if ($this->RecursiveFrameScanning($offset, $nextframetestoffset, true)) {
    879. 

  879. 						$recursivesearch = false;
    880. 

  880. 						$thisfile_mpeg_audio['bitrate_mode'] = 'cbr';
    881. 

  881. 					}
    882. 

  882. 					if ($thisfile_mpeg_audio['bitrate_mode'] == 'vbr') {
    883. 

  883. 						$info['warning'][] = 'VBR file with no VBR header. Bitrate values calculated from actual frame bitrates.';
    884. 

  884. 					}
    885. 

  885. 				}
    886. 

  886. 

  887. 			}
    888. 

  888. 

  889. 		}
    890. 

  890. 

  891. 		if (($ExpectedNumberOfAudioBytes > 0) && ($ExpectedNumberOfAudioBytes != ($info['avdataend'] - $info['avdataoffset']))) {
    892. 

  892. 			if ($ExpectedNumberOfAudioBytes > ($info['avdataend'] - $info['avdataoffset'])) {
    893. 

  893. 				if (isset($info['fileformat']) && ($info['fileformat'] == 'riff')) {
    894. 

  894. 					// ignore, audio data is broken into chunks so will always be data "missing"
    895. 

  895. 				} elseif (($ExpectedNumberOfAudioBytes - ($info['avdataend'] - $info['avdataoffset'])) == 1) {
    896. 

  896. 					$info['warning'][] = 'Last byte of data truncated (this is a known bug in Meracl ID3 Tag Writer before v1.3.5)';
    897. 

  897. 				} else {
    898. 

  898. 					$info['warning'][] = 'Probable truncated file: expecting '.$ExpectedNumberOfAudioBytes.' bytes of audio data, only found '.($info['avdataend'] - $info['avdataoffset']).' (short by '.($ExpectedNumberOfAudioBytes - ($info['avdat…
    899.

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