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1 <?php 2 ///////////////////////////////////////////////////////////////// 3 /// getID3() by James Heinrich <info@getid3.org> // 4 // available at http://getid3.sourceforge.net // 5 // or http://www.getid3.org // 6 ///////////////////////////////////////////////////////////////// 7 // See readme.txt for more details // 8 ///////////////////////////////////////////////////////////////// 9 // // 10 // module.audio.dts.php // 11 // module for analyzing DTS Audio files // 12 // dependencies: NONE // 13 // // 14 ///////////////////////////////////////////////////////////////// 15 16 17 /** 18 * @tutorial http://wiki.multimedia.cx/index.php?title=DTS 19 */ 20 class getid3_dts extends getid3_handler 21 { 22 /** 23 * Default DTS syncword used in native .cpt or .dts formats 24 */ 25 const syncword = "\x7F\xFE\x80\x01"; 26 27 private $readBinDataOffset = 0; 28 29 /** 30 * Possible syncwords indicating bitstream encoding 31 */ 32 public static $syncwords = array( 33 0 => "\x7F\xFE\x80\x01", // raw big-endian 34 1 => "\xFE\x7F\x01\x80", // raw little-endian 35 2 => "\x1F\xFF\xE8\x00", // 14-bit big-endian 36 3 => "\xFF\x1F\x00\xE8"); // 14-bit little-endian 37 38 public function Analyze() { 39 $info = &$this->getid3->info; 40 $info['fileformat'] = 'dts'; 41 42 $this->fseek($info['avdataoffset']); 43 $DTSheader = $this->fread(20); // we only need 2 words magic + 6 words frame header, but these words may be normal 16-bit words OR 14-bit words with 2 highest bits set to zero, so 8 words can be either 8*16/8 = 16 bytes OR 8*16*(16/14)/8 = 18.3 bytes 44 45 // check syncword 46 $sync = substr($DTSheader, 0, 4); 47 if (($encoding = array_search($sync, self::$syncwords)) !== false) { 48 49 $info['dts']['raw']['magic'] = $sync; 50 $this->readBinDataOffset = 32; 51 52 } elseif ($this->isDependencyFor('matroska')) { 53 54 // Matroska contains DTS without syncword encoded as raw big-endian format 55 $encoding = 0; 56 $this->readBinDataOffset = 0; 57 58 } else { 59 60 unset($info['fileformat']); 61 return $this->error('Expecting "'.implode('| ', array_map('getid3_lib::PrintHexBytes', self::$syncwords)).'" at offset '.$info['avdataoffset'].', found "'.getid3_lib::PrintHexBytes($sync).'"'); 62 63 } 64 65 // decode header 66 $fhBS = ''; 67 for ($word_offset = 0; $word_offset <= strlen($DTSheader); $word_offset += 2) { 68 switch ($encoding) { 69 case 0: // raw big-endian 70 $fhBS .= getid3_lib::BigEndian2Bin( substr($DTSheader, $word_offset, 2) ); 71 break; 72 case 1: // raw little-endian 73 $fhBS .= getid3_lib::BigEndian2Bin(strrev(substr($DTSheader, $word_offset, 2))); 74 break; 75 case 2: // 14-bit big-endian 76 $fhBS .= substr(getid3_lib::BigEndian2Bin( substr($DTSheader, $word_offset, 2) ), 2, 14); 77 break; 78 case 3: // 14-bit little-endian 79 $fhBS .= substr(getid3_lib::BigEndian2Bin(strrev(substr($DTSheader, $word_offset, 2))), 2, 14); 80 break; 81 } 82 } 83 84 $info['dts']['raw']['frame_type'] = $this->readBinData($fhBS, 1); 85 $info['dts']['raw']['deficit_samples'] = $this->readBinData($fhBS, 5); 86 $info['dts']['flags']['crc_present'] = (bool) $this->readBinData($fhBS, 1); 87 $info['dts']['raw']['pcm_sample_blocks'] = $this->readBinData($fhBS, 7); 88 $info['dts']['raw']['frame_byte_size'] = $this->readBinData($fhBS, 14); 89 $info['dts']['raw']['channel_arrangement'] = $this->readBinData($fhBS, 6); 90 $info['dts']['raw']['sample_frequency'] = $this->readBinData($fhBS, 4); 91 $info['dts']['raw']['bitrate'] = $this->readBinData($fhBS, 5); 92 $info['dts']['flags']['embedded_downmix'] = (bool) $this->readBinData($fhBS, 1); 93 $info['dts']['flags']['dynamicrange'] = (bool) $this->readBinData($fhBS, 1); 94 $info['dts']['flags']['timestamp'] = (bool) $this->readBinData($fhBS, 1); 95 $info['dts']['flags']['auxdata'] = (bool) $this->readBinData($fhBS, 1); 96 $info['dts']['flags']['hdcd'] = (bool) $this->readBinData($fhBS, 1); 97 $info['dts']['raw']['extension_audio'] = $this->readBinData($fhBS, 3); 98 $info['dts']['flags']['extended_coding'] = (bool) $this->readBinData($fhBS, 1); 99 $info['dts']['flags']['audio_sync_insertion'] = (bool) $this->readBinData($fhBS, 1); 100 $info['dts']['raw']['lfe_effects'] = $this->readBinData($fhBS, 2); 101 $info['dts']['flags']['predictor_history'] = (bool) $this->readBinData($fhBS, 1); 102 if ($info['dts']['flags']['crc_present']) { 103 $info['dts']['raw']['crc16'] = $this->readBinData($fhBS, 16); 104 } 105 $info['dts']['flags']['mri_perfect_reconst'] = (bool) $this->readBinData($fhBS, 1); 106 $info['dts']['raw']['encoder_soft_version'] = $this->readBinData($fhBS, 4); 107 $info['dts']['raw']['copy_history'] = $this->readBinData($fhBS, 2); 108 $info['dts']['raw']['bits_per_sample'] = $this->readBinData($fhBS, 2); 109 $info['dts']['flags']['surround_es'] = (bool) $this->readBinData($fhBS, 1); 110 $info['dts']['flags']['front_sum_diff'] = (bool) $this->readBinData($fhBS, 1); 111 $info['dts']['flags']['surround_sum_diff'] = (bool) $this->readBinData($fhBS, 1); 112 $info['dts']['raw']['dialog_normalization'] = $this->readBinData($fhBS, 4); 113 114 115 $info['dts']['bitrate'] = self::bitrateLookup($info['dts']['raw']['bitrate']); 116 $info['dts']['bits_per_sample'] = self::bitPerSampleLookup($info['dts']['raw']['bits_per_sample']); 117 $info['dts']['sample_rate'] = self::sampleRateLookup($info['dts']['raw']['sample_frequency']); 118 $info['dts']['dialog_normalization'] = self::dialogNormalization($info['dts']['raw']['dialog_normalization'], $info['dts']['raw']['encoder_soft_version']); 119 $info['dts']['flags']['lossless'] = (($info['dts']['raw']['bitrate'] == 31) ? true : false); 120 $info['dts']['bitrate_mode'] = (($info['dts']['raw']['bitrate'] == 30) ? 'vbr' : 'cbr'); 121 $info['dts']['channels'] = self::numChannelsLookup($info['dts']['raw']['channel_arrangement']); 122 $info['dts']['channel_arrangement'] = self::channelArrangementLookup($info['dts']['raw']['channel_arrangement']); 123 124 $info['audio']['dataformat'] = 'dts'; 125 $info['audio']['lossless'] = $info['dts']['flags']['lossless']; 126 $info['audio']['bitrate_mode'] = $info['dts']['bitrate_mode']; 127 $info['audio']['bits_per_sample'] = $info['dts']['bits_per_sample']; 128 $info['audio']['sample_rate'] = $info['dts']['sample_rate']; 129 $info['audio']['channels'] = $info['dts']['channels']; 130 $info['audio']['bitrate'] = $info['dts']['bitrate']; 131 if (isset($info['avdataend']) && !empty($info['dts']['bitrate']) && is_numeric($info['dts']['bitrate'])) { 132 $info['playtime_seconds'] = ($info['avdataend'] - $info['avdataoffset']) / ($info['dts']['bitrate'] / 8); 133 if (($encoding == 2) || ($encoding == 3)) { 134 // 14-bit data packed into 16-bit words, so the playtime is wrong because only (14/16) of the bytes in the data portion of the file are used at the specified bitrate 135 $info['playtime_seconds'] *= (14 / 16); 136 } 137 } 138 return true; 139 } 140 141 private function readBinData($bin, $length) { 142 $data = substr($bin, $this->readBinDataOffset, $length); 143 $this->readBinDataOffset += $length; 144 145 return bindec($data); 146 } 147 148 public static function bitrateLookup($index) { 149 static $lookup = array( 150 0 => 32000, 151 1 => 56000, 152 2 => 64000, 153 3 => 96000, 154 4 => 112000, 155 5 => 128000, 156 6 => 192000, 157 7 => 224000, 158 8 => 256000, 159 9 => 320000, 160 10 => 384000, 161 11 => 448000, 162 12 => 512000, 163 13 => 576000, 164 14 => 640000, 165 15 => 768000, 166 16 => 960000, 167 17 => 1024000, 168 18 => 1152000, 169 19 => 1280000, 170 20 => 1344000, 171 21 => 1408000, 172 22 => 1411200, 173 23 => 1472000, 174 24 => 1536000, 175 25 => 1920000, 176 26 => 2048000, 177 27 => 3072000, 178 28 => 3840000, 179 29 => 'open', 180 30 => 'variable', 181 31 => 'lossless', 182 ); 183 return (isset($lookup[$index]) ? $lookup[$index] : false); 184 } 185 186 public static function sampleRateLookup($index) { 187 static $lookup = array( 188 0 => 'invalid', 189 1 => 8000, 190 2 => 16000, 191 3 => 32000, 192 4 => 'invalid', 193 5 => 'invalid', 194 6 => 11025, 195 7 => 22050, 196 8 => 44100, 197 9 => 'invalid', 198 10 => 'invalid', 199 11 => 12000, 200 12 => 24000, 201 13 => 48000, 202 14 => 'invalid', 203 15 => 'invalid', 204 ); 205 return (isset($lookup[$index]) ? $lookup[$index] : false); 206 } 207 208 public static function bitPerSampleLookup($index) { 209 static $lookup = array( 210 0 => 16, 211 1 => 20, 212 2 => 24, 213 3 => 24, 214 ); 215 return (isset($lookup[$index]) ? $lookup[$index] : false); 216 } 217 218 public static function numChannelsLookup($index) { 219 switch ($index) { 220 case 0: 221 return 1; 222 break; 223 case 1: 224 case 2: 225 case 3: 226 case 4: 227 return 2; 228 break; 229 case 5: 230 case 6: 231 return 3; 232 break; 233 case 7: 234 case 8: 235 return 4; 236 break; 237 case 9: 238 return 5; 239 break; 240 case 10: 241 case 11: 242 case 12: 243 return 6; 244 break; 245 case 13: 246 return 7; 247 break; 248 case 14: 249 case 15: 250 return 8; 251 break; 252 } 253 return false; 254 } 255 256 public static function channelArrangementLookup($index) { 257 static $lookup = array( 258 0 => 'A', 259 1 => 'A + B (dual mono)', 260 2 => 'L + R (stereo)', 261 3 => '(L+R) + (L-R) (sum-difference)', 262 4 => 'LT + RT (left and right total)', 263 5 => 'C + L + R', 264 6 => 'L + R + S', 265 7 => 'C + L + R + S', 266 8 => 'L + R + SL + SR', 267 9 => 'C + L + R + SL + SR', 268 10 => 'CL + CR + L + R + SL + SR', 269 11 => 'C + L + R+ LR + RR + OV', 270 12 => 'CF + CR + LF + RF + LR + RR', 271 13 => 'CL + C + CR + L + R + SL + SR', 272 14 => 'CL + CR + L + R + SL1 + SL2 + SR1 + SR2', 273 15 => 'CL + C+ CR + L + R + SL + S + SR', 274 ); 275 return (isset($lookup[$index]) ? $lookup[$index] : 'user-defined'); 276 } 277 278 public static function dialogNormalization($index, $version) { 279 switch ($version) { 280 case 7: 281 return 0 - $index; 282 break; 283 case 6: 284 return 0 - 16 - $index; 285 break; 286 } 287 return false; 288 } 289 290 }
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| Generated: Tue Mar 25 01:41:18 2014 | WordPress honlapkészítés: online1.hu |