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/getid3/module.audio.wavpack.php

https://bitbucket.org/holyfield/getid3
PHP | 399 lines | 303 code | 66 blank | 30 comment | 31 complexity | 7670b58d5869641a51857b3e67ef5d23 MD5 | raw file
Possible License(s): GPL-2.0 
    

  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.wavpack.php                                    //
    11. 

  11. // module for analyzing WavPack v4.0+ Audio files              //
    12. 

  12. // dependencies: NONE                                          //
    13. 

  13. //                                                            ///
    14. 

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

  15. 

  16. 

  17. class getid3_wavpack extends getid3_handler
    18. 

  18. {
    19. 

  19. 

  20. 	function Analyze() {
    21. 

  21. 		$info = &$this->getid3->info;
    22. 

  22. 

  23. 		fseek($this->getid3->fp, $info['avdataoffset'], SEEK_SET);
    24. 

  24. 

  25. 		while (true) {
    26. 

  26. 

  27. 			$wavpackheader = fread($this->getid3->fp, 32);
    28. 

  28. 

  29. 			if (ftell($this->getid3->fp) >= $info['avdataend']) {
    30. 

  30. 				break;
    31. 

  31. 			} elseif (feof($this->getid3->fp)) {
    32. 

  32. 				break;
    33. 

  33. 			} elseif (
    34. 

  34. 				isset($info['wavpack']['blockheader']['total_samples']) &&
    35. 

  35. 				isset($info['wavpack']['blockheader']['block_samples']) &&
    36. 

  36. 				($info['wavpack']['blockheader']['total_samples'] > 0) &&
    37. 

  37. 				($info['wavpack']['blockheader']['block_samples'] > 0) &&
    38. 

  38. 				(!isset($info['wavpack']['riff_trailer_size']) || ($info['wavpack']['riff_trailer_size'] <= 0)) &&
    39. 

  39. 				((isset($info['wavpack']['config_flags']['md5_checksum']) && ($info['wavpack']['config_flags']['md5_checksum'] === false)) || !empty($info['md5_data_source']))) {
    40. 

  40. 					break;
    41. 

  41. 			}
    42. 

  42. 

  43. 			$blockheader_offset = ftell($this->getid3->fp) - 32;
    44. 

  44. 			$blockheader_magic  =                              substr($wavpackheader,  0,  4);
    45. 

  45. 			$blockheader_size   = getid3_lib::LittleEndian2Int(substr($wavpackheader,  4,  4));
    46. 

  46. 

  47. 			$magic = 'wvpk';
    48. 

  48. 			if ($blockheader_magic != $magic) {
    49. 

  49. 				$info['error'][] = 'Expecting "'.getid3_lib::PrintHexBytes($magic).'" at offset '.$blockheader_offset.', found "'.getid3_lib::PrintHexBytes($blockheader_magic).'"';
    50. 

  50. 				switch (isset($info['audio']['dataformat']) ? $info['audio']['dataformat'] : '') {
    51. 

  51. 					case 'wavpack':
    52. 

  52. 					case 'wvc':
    53. 

  53. 						break;
    54. 

  54. 					default:
    55. 

  55. 						unset($info['fileformat']);
    56. 

  56. 						unset($info['audio']);
    57. 

  57. 						unset($info['wavpack']);
    58. 

  58. 						break;
    59. 

  59. 				}
    60. 

  60. 				return false;
    61. 

  61. 			}
    62. 

  62. 

  63. 			if (empty($info['wavpack']['blockheader']['block_samples']) ||
    64. 

  64. 				empty($info['wavpack']['blockheader']['total_samples']) ||
    65. 

  65. 				($info['wavpack']['blockheader']['block_samples'] <= 0) ||
    66. 

  66. 				($info['wavpack']['blockheader']['total_samples'] <= 0)) {
    67. 

  67. 				// Also, it is possible that the first block might not have
    68. 

  68. 				// any samples (block_samples == 0) and in this case you should skip blocks
    69. 

  69. 				// until you find one with samples because the other information (like
    70. 

  70. 				// total_samples) are not guaranteed to be correct until (block_samples > 0)
    71. 

  71. 

  72. 				// Finally, I have defined a format for files in which the length is not known
    73. 

  73. 				// (for example when raw files are created using pipes). In these cases
    74. 

  74. 				// total_samples will be -1 and you must seek to the final block to determine
    75. 

  75. 				// the total number of samples.
    76. 

  76. 

  77. 

  78. 				$info['audio']['dataformat']   = 'wavpack';
    79. 

  79. 				$info['fileformat']            = 'wavpack';
    80. 

  80. 				$info['audio']['lossless']     = true;
    81. 

  81. 				$info['audio']['bitrate_mode'] = 'vbr';
    82. 

  82. 

  83. 				$info['wavpack']['blockheader']['offset'] = $blockheader_offset;
    84. 

  84. 				$info['wavpack']['blockheader']['magic']  = $blockheader_magic;
    85. 

  85. 				$info['wavpack']['blockheader']['size']   = $blockheader_size;
    86. 

  86. 

  87. 				if ($info['wavpack']['blockheader']['size'] >= 0x100000) {
    88. 

  88. 					$info['error'][] = 'Expecting WavPack block size less than "0x100000", found "'.$info['wavpack']['blockheader']['size'].'" at offset '.$info['wavpack']['blockheader']['offset'];
    89. 

  89. 					switch (isset($info['audio']['dataformat']) ? $info['audio']['dataformat'] : '') {
    90. 

  90. 						case 'wavpack':
    91. 

  91. 						case 'wvc':
    92. 

  92. 							break;
    93. 

  93. 						default:
    94. 

  94. 							unset($info['fileformat']);
    95. 

  95. 							unset($info['audio']);
    96. 

  96. 							unset($info['wavpack']);
    97. 

  97. 							break;
    98. 

  98. 					}
    99. 

  99. 					return false;
    100. 

  100. 				}
    101. 

  101. 

  102. 				$info['wavpack']['blockheader']['minor_version'] = ord($wavpackheader{8});
    103. 

  103. 				$info['wavpack']['blockheader']['major_version'] = ord($wavpackheader{9});
    104. 

  104. 

  105. 				if (($info['wavpack']['blockheader']['major_version'] != 4) ||
    106. 

  106. 					(($info['wavpack']['blockheader']['minor_version'] < 4) &&
    107. 

  107. 					($info['wavpack']['blockheader']['minor_version'] > 16))) {
    108. 

  108. 						$info['error'][] = 'Expecting WavPack version between "4.2" and "4.16", found version "'.$info['wavpack']['blockheader']['major_version'].'.'.$info['wavpack']['blockheader']['minor_version'].'" at offset '.$info['wavpack']['blockheader']['offset'];
    109. 

  109. 						switch (isset($info['audio']['dataformat']) ? $info['audio']['dataformat'] : '') {
    110. 

  110. 							case 'wavpack':
    111. 

  111. 							case 'wvc':
    112. 

  112. 								break;
    113. 

  113. 							default:
    114. 

  114. 								unset($info['fileformat']);
    115. 

  115. 								unset($info['audio']);
    116. 

  116. 								unset($info['wavpack']);
    117. 

  117. 								break;
    118. 

  118. 						}
    119. 

  119. 						return false;
    120. 

  120. 				}
    121. 

  121. 

  122. 				$info['wavpack']['blockheader']['track_number']  = ord($wavpackheader{10}); // unused
    123. 

  123. 				$info['wavpack']['blockheader']['index_number']  = ord($wavpackheader{11}); // unused
    124. 

  124. 				$info['wavpack']['blockheader']['total_samples'] = getid3_lib::LittleEndian2Int(substr($wavpackheader, 12,  4));
    125. 

  125. 				$info['wavpack']['blockheader']['block_index']   = getid3_lib::LittleEndian2Int(substr($wavpackheader, 16,  4));
    126. 

  126. 				$info['wavpack']['blockheader']['block_samples'] = getid3_lib::LittleEndian2Int(substr($wavpackheader, 20,  4));
    127. 

  127. 				$info['wavpack']['blockheader']['flags_raw']     = getid3_lib::LittleEndian2Int(substr($wavpackheader, 24,  4));
    128. 

  128. 				$info['wavpack']['blockheader']['crc']           = getid3_lib::LittleEndian2Int(substr($wavpackheader, 28,  4));
    129. 

  129. 

  130. 				$info['wavpack']['blockheader']['flags']['bytes_per_sample']     =    1 + ($info['wavpack']['blockheader']['flags_raw'] & 0x00000003);
    131. 

  131. 				$info['wavpack']['blockheader']['flags']['mono']                 = (bool) ($info['wavpack']['blockheader']['flags_raw'] & 0x00000004);
    132. 

  132. 				$info['wavpack']['blockheader']['flags']['hybrid']               = (bool) ($info['wavpack']['blockheader']['flags_raw'] & 0x00000008);
    133. 

  133. 				$info['wavpack']['blockheader']['flags']['joint_stereo']         = (bool) ($info['wavpack']['blockheader']['flags_raw'] & 0x00000010);
    134. 

  134. 				$info['wavpack']['blockheader']['flags']['cross_decorrelation']  = (bool) ($info['wavpack']['blockheader']['flags_raw'] & 0x00000020);
    135. 

  135. 				$info['wavpack']['blockheader']['flags']['hybrid_noiseshape']    = (bool) ($info['wavpack']['blockheader']['flags_raw'] & 0x00000040);
    136. 

  136. 				$info['wavpack']['blockheader']['flags']['ieee_32bit_float']     = (bool) ($info['wavpack']['blockheader']['flags_raw'] & 0x00000080);
    137. 

  137. 				$info['wavpack']['blockheader']['flags']['int_32bit']            = (bool) ($info['wavpack']['blockheader']['flags_raw'] & 0x00000100);
    138. 

  138. 				$info['wavpack']['blockheader']['flags']['hybrid_bitrate_noise'] = (bool) ($info['wavpack']['blockheader']['flags_raw'] & 0x00000200);
    139. 

  139. 				$info['wavpack']['blockheader']['flags']['hybrid_balance_noise'] = (bool) ($info['wavpack']['blockheader']['flags_raw'] & 0x00000400);
    140. 

  140. 				$info['wavpack']['blockheader']['flags']['multichannel_initial'] = (bool) ($info['wavpack']['blockheader']['flags_raw'] & 0x00000800);
    141. 

  141. 				$info['wavpack']['blockheader']['flags']['multichannel_final']   = (bool) ($info['wavpack']['blockheader']['flags_raw'] & 0x00001000);
    142. 

  142. 

  143. 				$info['audio']['lossless'] = !$info['wavpack']['blockheader']['flags']['hybrid'];
    144. 

  144. 			}
    145. 

  145. 

  146. 			while (!feof($this->getid3->fp) && (ftell($this->getid3->fp) < ($blockheader_offset + $blockheader_size + 8))) {
    147. 

  147. 

  148. 				$metablock = array('offset'=>ftell($this->getid3->fp));
    149. 

  149. 				$metablockheader = fread($this->getid3->fp, 2);
    150. 

  150. 				if (feof($this->getid3->fp)) {
    151. 

  151. 					break;
    152. 

  152. 				}
    153. 

  153. 				$metablock['id'] = ord($metablockheader{0});
    154. 

  154. 				$metablock['function_id'] = ($metablock['id'] & 0x3F);
    155. 

  155. 				$metablock['function_name'] = $this->WavPackMetablockNameLookup($metablock['function_id']);
    156. 

  156. 

  157. 				// The 0x20 bit in the id of the meta subblocks (which is defined as
    158. 

  158. 				// ID_OPTIONAL_DATA) is a permanent part of the id. The idea is that
    159. 

  159. 				// if a decoder encounters an id that it does not know about, it uses
    160. 

  160. 				// that "ID_OPTIONAL_DATA" flag to determine what to do. If it is set
    161. 

  161. 				// then the decoder simply ignores the metadata, but if it is zero
    162. 

  162. 				// then the decoder should quit because it means that an understanding
    163. 

  163. 				// of the metadata is required to correctly decode the audio.
    164. 

  164. 				$metablock['non_decoder'] = (bool) ($metablock['id'] & 0x20);
    165. 

  165. 

  166. 				$metablock['padded_data'] = (bool) ($metablock['id'] & 0x40);
    167. 

  167. 				$metablock['large_block'] = (bool) ($metablock['id'] & 0x80);
    168. 

  168. 				if ($metablock['large_block']) {
    169. 

  169. 					$metablockheader .= fread($this->getid3->fp, 2);
    170. 

  170. 				}
    171. 

  171. 				$metablock['size'] = getid3_lib::LittleEndian2Int(substr($metablockheader, 1)) * 2; // size is stored in words
    172. 

  172. 				$metablock['data'] = null;
    173. 

  173. 

  174. 				if ($metablock['size'] > 0) {
    175. 

  175. 

  176. 					switch ($metablock['function_id']) {
    177. 

  177. 						case 0x21: // ID_RIFF_HEADER
    178. 

  178. 						case 0x22: // ID_RIFF_TRAILER
    179. 

  179. 						case 0x23: // ID_REPLAY_GAIN
    180. 

  180. 						case 0x24: // ID_CUESHEET
    181. 

  181. 						case 0x25: // ID_CONFIG_BLOCK
    182. 

  182. 						case 0x26: // ID_MD5_CHECKSUM
    183. 

  183. 							$metablock['data'] = fread($this->getid3->fp, $metablock['size']);
    184. 

  184. 

  185. 							if ($metablock['padded_data']) {
    186. 

  186. 								// padded to the nearest even byte
    187. 

  187. 								$metablock['size']--;
    188. 

  188. 								$metablock['data'] = substr($metablock['data'], 0, -1);
    189. 

  189. 							}
    190. 

  190. 							break;
    191. 

  191. 

  192. 						case 0x00: // ID_DUMMY
    193. 

  193. 						case 0x01: // ID_ENCODER_INFO
    194. 

  194. 						case 0x02: // ID_DECORR_TERMS
    195. 

  195. 						case 0x03: // ID_DECORR_WEIGHTS
    196. 

  196. 						case 0x04: // ID_DECORR_SAMPLES
    197. 

  197. 						case 0x05: // ID_ENTROPY_VARS
    198. 

  198. 						case 0x06: // ID_HYBRID_PROFILE
    199. 

  199. 						case 0x07: // ID_SHAPING_WEIGHTS
    200. 

  200. 						case 0x08: // ID_FLOAT_INFO
    201. 

  201. 						case 0x09: // ID_INT32_INFO
    202. 

  202. 						case 0x0A: // ID_WV_BITSTREAM
    203. 

  203. 						case 0x0B: // ID_WVC_BITSTREAM
    204. 

  204. 						case 0x0C: // ID_WVX_BITSTREAM
    205. 

  205. 						case 0x0D: // ID_CHANNEL_INFO
    206. 

  206. 							fseek($this->getid3->fp, $metablock['offset'] + ($metablock['large_block'] ? 4 : 2) + $metablock['size'], SEEK_SET);
    207. 

  207. 							break;
    208. 

  208. 

  209. 						default:
    210. 

  210. 							$info['warning'][] = 'Unexpected metablock type "0x'.str_pad(dechex($metablock['function_id']), 2, '0', STR_PAD_LEFT).'" at offset '.$metablock['offset'];
    211. 

  211. 							fseek($this->getid3->fp, $metablock['offset'] + ($metablock['large_block'] ? 4 : 2) + $metablock['size'], SEEK_SET);
    212. 

  212. 							break;
    213. 

  213. 					}
    214. 

  214. 

  215. 					switch ($metablock['function_id']) {
    216. 

  216. 						case 0x21: // ID_RIFF_HEADER
    217. 

  217. 							getid3_lib::IncludeDependency(GETID3_INCLUDEPATH.'module.audio-video.riff.php', __FILE__, true);
    218. 

  218. 							$original_wav_filesize = getid3_lib::LittleEndian2Int(substr($metablock['data'], 4, 4));
    219. 

  219. 

  220. 							$getid3_temp = new getID3();
    221. 

  221. 							$getid3_temp->openfile($this->getid3->filename);
    222. 

  222. 							$getid3_riff = new getid3_riff($getid3_temp);
    223. 

  223. 							$getid3_riff->ParseRIFFdata($metablock['data']);
    224. 

  224. 							$metablock['riff']            = $getid3_temp->info['riff'];
    225. 

  225. 							$info['audio']['sample_rate'] = $getid3_temp->info['riff']['raw']['fmt ']['nSamplesPerSec'];
    226. 

  226. 							unset($getid3_riff, $getid3_temp);
    227. 

  227. 

  228. 							$metablock['riff']['original_filesize'] = $original_wav_filesize;
    229. 

  229. 							$info['wavpack']['riff_trailer_size'] = $original_wav_filesize - $metablock['riff']['WAVE']['data'][0]['size'] - $metablock['riff']['header_size'];
    230. 

  230. 							$info['playtime_seconds'] = $info['wavpack']['blockheader']['total_samples'] / $info['audio']['sample_rate'];
    231. 

  231. 

  232. 							// Safe RIFF header in case there's a RIFF footer later
    233. 

  233. 							$metablockRIFFheader = $metablock['data'];
    234. 

  234. 							break;
    235. 

  235. 

  236. 

  237. 						case 0x22: // ID_RIFF_TRAILER
    238. 

  238. 							$metablockRIFFfooter = $metablockRIFFheader.$metablock['data'];
    239. 

  239. 							getid3_lib::IncludeDependency(GETID3_INCLUDEPATH.'module.audio-video.riff.php', __FILE__, true);
    240. 

  240. 

  241. 							$startoffset = $metablock['offset'] + ($metablock['large_block'] ? 4 : 2);
    242. 

  242. 							$getid3_temp = new getID3();
    243. 

  243. 							$getid3_temp->openfile($this->getid3->filename);
    244. 

  244. 							$getid3_temp->info['avdataend']  = $info['avdataend'];
    245. 

  245. 							$getid3_temp->info['fileformat'] = 'riff';
    246. 

  246. 							$getid3_riff = new getid3_riff($getid3_temp);
    247. 

  247. 							$metablock['riff'] = $getid3_riff->ParseRIFF($startoffset, $startoffset + $metablock['size']);
    248. 

  248. 

  249. 							if (!empty($metablock['riff']['INFO'])) {
    250. 

  250. 								$getid3_riff->RIFFcommentsParse($metablock['riff']['INFO'], $metablock['comments']);
    251. 

  251. 								$info['tags']['riff'] = $metablock['comments'];
    252. 

  252. 							}
    253. 

  253. 							unset($getid3_temp, $getid3_riff);
    254. 

  254. 							break;
    255. 

  255. 

  256. 

  257. 						case 0x23: // ID_REPLAY_GAIN
    258. 

  258. 							$info['warning'][] = 'WavPack "Replay Gain" contents not yet handled by getID3() in metablock at offset '.$metablock['offset'];
    259. 

  259. 							break;
    260. 

  260. 

  261. 

  262. 						case 0x24: // ID_CUESHEET
    263. 

  263. 							$info['warning'][] = 'WavPack "Cuesheet" contents not yet handled by getID3() in metablock at offset '.$metablock['offset'];
    264. 

  264. 							break;
    265. 

  265. 

  266. 

  267. 						case 0x25: // ID_CONFIG_BLOCK
    268. 

  268. 							$metablock['flags_raw'] = getid3_lib::LittleEndian2Int(substr($metablock['data'], 0, 3));
    269. 

  269. 

  270. 							$metablock['flags']['adobe_mode']     = (bool) ($metablock['flags_raw'] & 0x000001); // "adobe" mode for 32-bit floats
    271. 

  271. 							$metablock['flags']['fast_flag']      = (bool) ($metablock['flags_raw'] & 0x000002); // fast mode
    272. 

  272. 							$metablock['flags']['very_fast_flag'] = (bool) ($metablock['flags_raw'] & 0x000004); // double fast
    273. 

  273. 							$metablock['flags']['high_flag']      = (bool) ($metablock['flags_raw'] & 0x000008); // high quality mode
    274. 

  274. 							$metablock['flags']['very_high_flag'] = (bool) ($metablock['flags_raw'] & 0x000010); // double high (not used yet)
    275. 

  275. 							$metablock['flags']['bitrate_kbps']   = (bool) ($metablock['flags_raw'] & 0x000020); // bitrate is kbps, not bits / sample
    276. 

  276. 							$metablock['flags']['auto_shaping']   = (bool) ($metablock['flags_raw'] & 0x000040); // automatic noise shaping
    277. 

  277. 							$metablock['flags']['shape_override'] = (bool) ($metablock['flags_raw'] & 0x000080); // shaping mode specified
    278. 

  278. 							$metablock['flags']['joint_override'] = (bool) ($metablock['flags_raw'] & 0x000100); // joint-stereo mode specified
    279. 

  279. 							$metablock['flags']['copy_time']      = (bool) ($metablock['flags_raw'] & 0x000200); // copy file-time from source
    280. 

  280. 							$metablock['flags']['create_exe']     = (bool) ($metablock['flags_raw'] & 0x000400); // create executable
    281. 

  281. 							$metablock['flags']['create_wvc']     = (bool) ($metablock['flags_raw'] & 0x000800); // create correction file
    282. 

  282. 							$metablock['flags']['optimize_wvc']   = (bool) ($metablock['flags_raw'] & 0x001000); // maximize bybrid compression
    283. 

  283. 							$metablock['flags']['quality_mode']   = (bool) ($metablock['flags_raw'] & 0x002000); // psychoacoustic quality mode
    284. 

  284. 							$metablock['flags']['raw_flag']       = (bool) ($metablock['flags_raw'] & 0x004000); // raw mode (not implemented yet)
    285. 

  285. 							$metablock['flags']['calc_noise']     = (bool) ($metablock['flags_raw'] & 0x008000); // calc noise in hybrid mode
    286. 

  286. 							$metablock['flags']['lossy_mode']     = (bool) ($metablock['flags_raw'] & 0x010000); // obsolete (for information)
    287. 

  287. 							$metablock['flags']['extra_mode']     = (bool) ($metablock['flags_raw'] & 0x020000); // extra processing mode
    288. 

  288. 							$metablock['flags']['skip_wvx']       = (bool) ($metablock['flags_raw'] & 0x040000); // no wvx stream w/ floats & big ints
    289. 

  289. 							$metablock['flags']['md5_checksum']   = (bool) ($metablock['flags_raw'] & 0x080000); // compute & store MD5 signature
    290. 

  290. 							$metablock['flags']['quiet_mode']     = (bool) ($metablock['flags_raw'] & 0x100000); // don't report progress %
    291. 

  291. 

  292. 							$info['wavpack']['config_flags'] = $metablock['flags'];
    293. 

  293. 

  294. 

  295. 							$info['audio']['encoder_options'] = '';
    296. 

  296. 							if ($info['wavpack']['blockheader']['flags']['hybrid']) {
    297. 

  297. 								$info['audio']['encoder_options'] .= ' -b???';
    298. 

  298. 							}
    299. 

  299. 							$info['audio']['encoder_options'] .= ($metablock['flags']['adobe_mode']     ? ' -a' : '');
    300. 

  300. 							$info['audio']['encoder_options'] .= ($metablock['flags']['optimize_wvc']   ? ' -cc' : '');
    301. 

  301. 							$info['audio']['encoder_options'] .= ($metablock['flags']['create_exe']     ? ' -e' : '');
    302. 

  302. 							$info['audio']['encoder_options'] .= ($metablock['flags']['fast_flag']      ? ' -f' : '');
    303. 

  303. 							$info['audio']['encoder_options'] .= ($metablock['flags']['joint_override'] ? ' -j?' : '');
    304. 

  304. 							$info['audio']['encoder_options'] .= ($metablock['flags']['high_flag']      ? ' -h' : '');
    305. 

  305. 							$info['audio']['encoder_options'] .= ($metablock['flags']['md5_checksum']   ? ' -m' : '');
    306. 

  306. 							$info['audio']['encoder_options'] .= ($metablock['flags']['calc_noise']     ? ' -n' : '');
    307. 

  307. 							$info['audio']['encoder_options'] .= ($metablock['flags']['shape_override'] ? ' -s?' : '');
    308. 

  308. 							$info['audio']['encoder_options'] .= ($metablock['flags']['extra_mode']     ? ' -x?' : '');
    309. 

  309. 							if (!empty($info['audio']['encoder_options'])) {
    310. 

  310. 								$info['audio']['encoder_options'] = trim($info['audio']['encoder_options']);
    311. 

  311. 							} elseif (isset($info['audio']['encoder_options'])) {
    312. 

  312. 								unset($info['audio']['encoder_options']);
    313. 

  313. 							}
    314. 

  314. 							break;
    315. 

  315. 

  316. 

  317. 						case 0x26: // ID_MD5_CHECKSUM
    318. 

  318. 							if (strlen($metablock['data']) == 16) {
    319. 

  319. 								$info['md5_data_source'] = strtolower(getid3_lib::PrintHexBytes($metablock['data'], true, false, false));
    320. 

  320. 							} else {
    321. 

  321. 								$info['warning'][] = 'Expecting 16 bytes of WavPack "MD5 Checksum" in metablock at offset '.$metablock['offset'].', but found '.strlen($metablock['data']).' bytes';
    322. 

  322. 							}
    323. 

  323. 							break;
    324. 

  324. 

  325. 

  326. 						case 0x00: // ID_DUMMY
    327. 

  327. 						case 0x01: // ID_ENCODER_INFO
    328. 

  328. 						case 0x02: // ID_DECORR_TERMS
    329. 

  329. 						case 0x03: // ID_DECORR_WEIGHTS
    330. 

  330. 						case 0x04: // ID_DECORR_SAMPLES
    331. 

  331. 						case 0x05: // ID_ENTROPY_VARS
    332. 

  332. 						case 0x06: // ID_HYBRID_PROFILE
    333. 

  333. 						case 0x07: // ID_SHAPING_WEIGHTS
    334. 

  334. 						case 0x08: // ID_FLOAT_INFO
    335. 

  335. 						case 0x09: // ID_INT32_INFO
    336. 

  336. 						case 0x0A: // ID_WV_BITSTREAM
    337. 

  337. 						case 0x0B: // ID_WVC_BITSTREAM
    338. 

  338. 						case 0x0C: // ID_WVX_BITSTREAM
    339. 

  339. 						case 0x0D: // ID_CHANNEL_INFO
    340. 

  340. 							unset($metablock);
    341. 

  341. 							break;
    342. 

  342. 					}
    343. 

  343. 

  344. 				}
    345. 

  345. 				if (!empty($metablock)) {
    346. 

  346. 					$info['wavpack']['metablocks'][] = $metablock;
    347. 

  347. 				}
    348. 

  348. 

  349. 			}
    350. 

  350. 

  351. 		}
    352. 

  352. 

  353. 		$info['audio']['encoder']         = 'WavPack v'.$info['wavpack']['blockheader']['major_version'].'.'.str_pad($info['wavpack']['blockheader']['minor_version'], 2, '0', STR_PAD_LEFT);
    354. 

  354. 		$info['audio']['bits_per_sample'] = $info['wavpack']['blockheader']['flags']['bytes_per_sample'] * 8;
    355. 

  355. 		$info['audio']['channels']        = ($info['wavpack']['blockheader']['flags']['mono'] ? 1 : 2);
    356. 

  356. 

  357. 		if (!empty($info['playtime_seconds'])) {
    358. 

  358. 

  359. 			$info['audio']['bitrate']     = (($info['avdataend'] - $info['avdataoffset']) * 8) / $info['playtime_seconds'];
    360. 

  360. 

  361. 		} else {
    362. 

  362. 

  363. 			$info['audio']['dataformat']  = 'wvc';
    364. 

  364. 

  365. 		}
    366. 

  366. 

  367. 		return true;
    368. 

  368. 	}
    369. 

  369. 

  370. 

  371. 	function WavPackMetablockNameLookup(&$id) {
    372. 

  372. 		static $WavPackMetablockNameLookup = array(
    373. 

  373. 			0x00 => 'Dummy',
    374. 

  374. 			0x01 => 'Encoder Info',
    375. 

  375. 			0x02 => 'Decorrelation Terms',
    376. 

  376. 			0x03 => 'Decorrelation Weights',
    377. 

  377. 			0x04 => 'Decorrelation Samples',
    378. 

  378. 			0x05 => 'Entropy Variables',
    379. 

  379. 			0x06 => 'Hybrid Profile',
    380. 

  380. 			0x07 => 'Shaping Weights',
    381. 

  381. 			0x08 => 'Float Info',
    382. 

  382. 			0x09 => 'Int32 Info',
    383. 

  383. 			0x0A => 'WV Bitstream',
    384. 

  384. 			0x0B => 'WVC Bitstream',
    385. 

  385. 			0x0C => 'WVX Bitstream',
    386. 

  386. 			0x0D => 'Channel Info',
    387. 

  387. 			0x21 => 'RIFF header',
    388. 

  388. 			0x22 => 'RIFF trailer',
    389. 

  389. 			0x23 => 'Replay Gain',
    390. 

  390. 			0x24 => 'Cuesheet',
    391. 

  391. 			0x25 => 'Config Block',
    392. 

  392. 			0x26 => 'MD5 Checksum',
    393. 

  393. 		);
    394. 

  394. 		return (isset($WavPackMetablockNameLookup[$id]) ? $WavPackMetablockNameLookup[$id] : '');
    395. 

  395. 	}
    396. 

  396. 

  397. }
    398. 

  398. 

  399. 

  400.