wp-includes/ID3/module.audio.dts.php

   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 //          also https://github.com/JamesHeinrich/getID3       //
   7 /////////////////////////////////////////////////////////////////
   8 // See readme.txt for more details                             //
   9 /////////////////////////////////////////////////////////////////
  10 //                                                             //
  11 // module.audio.dts.php                                        //
  12 // module for analyzing DTS Audio files                        //
  13 // dependencies: NONE                                          //
  14 //                                                             //
  15 /////////////////////////////////////////////////////////////////
  16
  17
  18 /**
  19 * @tutorial http://wiki.multimedia.cx/index.php?title=DTS
  20 */
  21 class getid3_dts extends getid3_handler
  22 {
  23         /**
  24         * Default DTS syncword used in native .cpt or .dts formats
  25         */
  26     const syncword = "\x7F\xFE\x80\x01";
  27
  28         private $readBinDataOffset = 0;
  29
  30     /**
  31     * Possible syncwords indicating bitstream encoding
  32     */
  33     public static $syncwords = array(
  34         0 => "\x7F\xFE\x80\x01",  // raw big-endian
  35         1 => "\xFE\x7F\x01\x80",  // raw little-endian
  36         2 => "\x1F\xFF\xE8\x00",  // 14-bit big-endian
  37         3 => "\xFF\x1F\x00\xE8"); // 14-bit little-endian
  38
  39         public function Analyze() {
  40                 $info = &$this->getid3->info;
  41                 $info['fileformat'] = 'dts';
  42
  43                 $this->fseek($info['avdataoffset']);
  44                 $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
  45
  46                 // check syncword
  47                 $sync = substr($DTSheader, 0, 4);
  48         if (($encoding = array_search($sync, self::$syncwords)) !== false) {
  49
  50                 $info['dts']['raw']['magic'] = $sync;
  51                         $this->readBinDataOffset = 32;
  52
  53         } elseif ($this->isDependencyFor('matroska')) {
  54
  55                         // Matroska contains DTS without syncword encoded as raw big-endian format
  56                         $encoding = 0;
  57                         $this->readBinDataOffset = 0;
  58
  59         } else {
  60
  61                         unset($info['fileformat']);
  62                         return $this->error('Expecting "'.implode('| ', array_map('getid3_lib::PrintHexBytes', self::$syncwords)).'" at offset '.$info['avdataoffset'].', found "'.getid3_lib::PrintHexBytes($sync).'"');
  63
  64                 }
  65
  66                 // decode header
  67                 $fhBS = '';
  68                 for ($word_offset = 0; $word_offset <= strlen($DTSheader); $word_offset += 2) {
  69                         switch ($encoding) {
  70                                 case 0: // raw big-endian
  71                                         $fhBS .=        getid3_lib::BigEndian2Bin(       substr($DTSheader, $word_offset, 2) );
  72                                         break;
  73                                 case 1: // raw little-endian
  74                                         $fhBS .=        getid3_lib::BigEndian2Bin(strrev(substr($DTSheader, $word_offset, 2)));
  75                                         break;
  76                                 case 2: // 14-bit big-endian
  77                                         $fhBS .= substr(getid3_lib::BigEndian2Bin(       substr($DTSheader, $word_offset, 2) ), 2, 14);
  78                                         break;
  79                                 case 3: // 14-bit little-endian
  80                                         $fhBS .= substr(getid3_lib::BigEndian2Bin(strrev(substr($DTSheader, $word_offset, 2))), 2, 14);
  81                                         break;
  82                         }
  83                 }
  84
  85                 $info['dts']['raw']['frame_type']             =        $this->readBinData($fhBS,  1);
  86                 $info['dts']['raw']['deficit_samples']        =        $this->readBinData($fhBS,  5);
  87                 $info['dts']['flags']['crc_present']          = (bool) $this->readBinData($fhBS,  1);
  88                 $info['dts']['raw']['pcm_sample_blocks']      =        $this->readBinData($fhBS,  7);
  89                 $info['dts']['raw']['frame_byte_size']        =        $this->readBinData($fhBS, 14);
  90                 $info['dts']['raw']['channel_arrangement']    =        $this->readBinData($fhBS,  6);
  91                 $info['dts']['raw']['sample_frequency']       =        $this->readBinData($fhBS,  4);
  92                 $info['dts']['raw']['bitrate']                =        $this->readBinData($fhBS,  5);
  93                 $info['dts']['flags']['embedded_downmix']     = (bool) $this->readBinData($fhBS,  1);
  94                 $info['dts']['flags']['dynamicrange']         = (bool) $this->readBinData($fhBS,  1);
  95                 $info['dts']['flags']['timestamp']            = (bool) $this->readBinData($fhBS,  1);
  96                 $info['dts']['flags']['auxdata']              = (bool) $this->readBinData($fhBS,  1);
  97                 $info['dts']['flags']['hdcd']                 = (bool) $this->readBinData($fhBS,  1);
  98                 $info['dts']['raw']['extension_audio']        =        $this->readBinData($fhBS,  3);
  99                 $info['dts']['flags']['extended_coding']      = (bool) $this->readBinData($fhBS,  1);
 100                 $info['dts']['flags']['audio_sync_insertion'] = (bool) $this->readBinData($fhBS,  1);
 101                 $info['dts']['raw']['lfe_effects']            =        $this->readBinData($fhBS,  2);
 102                 $info['dts']['flags']['predictor_history']    = (bool) $this->readBinData($fhBS,  1);
 103                 if ($info['dts']['flags']['crc_present']) {
 104                         $info['dts']['raw']['crc16']              =        $this->readBinData($fhBS, 16);
 105                 }
 106                 $info['dts']['flags']['mri_perfect_reconst']  = (bool) $this->readBinData($fhBS,  1);
 107                 $info['dts']['raw']['encoder_soft_version']   =        $this->readBinData($fhBS,  4);
 108                 $info['dts']['raw']['copy_history']           =        $this->readBinData($fhBS,  2);
 109                 $info['dts']['raw']['bits_per_sample']        =        $this->readBinData($fhBS,  2);
 110                 $info['dts']['flags']['surround_es']          = (bool) $this->readBinData($fhBS,  1);
 111                 $info['dts']['flags']['front_sum_diff']       = (bool) $this->readBinData($fhBS,  1);
 112                 $info['dts']['flags']['surround_sum_diff']    = (bool) $this->readBinData($fhBS,  1);
 113                 $info['dts']['raw']['dialog_normalization']   =        $this->readBinData($fhBS,  4);
 114
 115
 116                 $info['dts']['bitrate']              = self::bitrateLookup($info['dts']['raw']['bitrate']);
 117                 $info['dts']['bits_per_sample']      = self::bitPerSampleLookup($info['dts']['raw']['bits_per_sample']);
 118                 $info['dts']['sample_rate']          = self::sampleRateLookup($info['dts']['raw']['sample_frequency']);
 119                 $info['dts']['dialog_normalization'] = self::dialogNormalization($info['dts']['raw']['dialog_normalization'], $info['dts']['raw']['encoder_soft_version']);
 120                 $info['dts']['flags']['lossless']    = (($info['dts']['raw']['bitrate'] == 31) ? true  : false);
 121                 $info['dts']['bitrate_mode']         = (($info['dts']['raw']['bitrate'] == 30) ? 'vbr' : 'cbr');
 122                 $info['dts']['channels']             = self::numChannelsLookup($info['dts']['raw']['channel_arrangement']);
 123                 $info['dts']['channel_arrangement']  = self::channelArrangementLookup($info['dts']['raw']['channel_arrangement']);
 124
 125                 $info['audio']['dataformat']          = 'dts';
 126                 $info['audio']['lossless']            = $info['dts']['flags']['lossless'];
 127                 $info['audio']['bitrate_mode']        = $info['dts']['bitrate_mode'];
 128                 $info['audio']['bits_per_sample']     = $info['dts']['bits_per_sample'];
 129                 $info['audio']['sample_rate']         = $info['dts']['sample_rate'];
 130                 $info['audio']['channels']            = $info['dts']['channels'];
 131                 $info['audio']['bitrate']             = $info['dts']['bitrate'];
 132                 if (isset($info['avdataend']) && !empty($info['dts']['bitrate']) && is_numeric($info['dts']['bitrate'])) {
 133                         $info['playtime_seconds']         = ($info['avdataend'] - $info['avdataoffset']) / ($info['dts']['bitrate'] / 8);
 134                         if (($encoding == 2) || ($encoding == 3)) {
 135                                 // 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
 136                                 $info['playtime_seconds'] *= (14 / 16);
 137                         }
 138                 }
 139                 return true;
 140         }
 141
 142         private function readBinData($bin, $length) {
 143                 $data = substr($bin, $this->readBinDataOffset, $length);
 144                 $this->readBinDataOffset += $length;
 145
 146                 return bindec($data);
 147         }
 148
 149         public static function bitrateLookup($index) {
 150                 static $lookup = array(
 151                         0  => 32000,
 152                         1  => 56000,
 153                         2  => 64000,
 154                         3  => 96000,
 155                         4  => 112000,
 156                         5  => 128000,
 157                         6  => 192000,
 158                         7  => 224000,
 159                         8  => 256000,
 160                         9  => 320000,
 161                         10 => 384000,
 162                         11 => 448000,
 163                         12 => 512000,
 164                         13 => 576000,
 165                         14 => 640000,
 166                         15 => 768000,
 167                         16 => 960000,
 168                         17 => 1024000,
 169                         18 => 1152000,
 170                         19 => 1280000,
 171                         20 => 1344000,
 172                         21 => 1408000,
 173                         22 => 1411200,
 174                         23 => 1472000,
 175                         24 => 1536000,
 176                         25 => 1920000,
 177                         26 => 2048000,
 178                         27 => 3072000,
 179                         28 => 3840000,
 180                         29 => 'open',
 181                         30 => 'variable',
 182                         31 => 'lossless',
 183                 );
 184                 return (isset($lookup[$index]) ? $lookup[$index] : false);
 185         }
 186
 187         public static function sampleRateLookup($index) {
 188                 static $lookup = array(
 189                         0  => 'invalid',
 190                         1  => 8000,
 191                         2  => 16000,
 192                         3  => 32000,
 193                         4  => 'invalid',
 194                         5  => 'invalid',
 195                         6  => 11025,
 196                         7  => 22050,
 197                         8  => 44100,
 198                         9  => 'invalid',
 199                         10 => 'invalid',
 200                         11 => 12000,
 201                         12 => 24000,
 202                         13 => 48000,
 203                         14 => 'invalid',
 204                         15 => 'invalid',
 205                 );
 206                 return (isset($lookup[$index]) ? $lookup[$index] : false);
 207         }
 208
 209         public static function bitPerSampleLookup($index) {
 210                 static $lookup = array(
 211                         0  => 16,
 212                         1  => 20,
 213                         2  => 24,
 214                         3  => 24,
 215                 );
 216                 return (isset($lookup[$index]) ? $lookup[$index] : false);
 217         }
 218
 219         public static function numChannelsLookup($index) {
 220                 switch ($index) {
 221                         case 0:
 222                                 return 1;
 223                                 break;
 224                         case 1:
 225                         case 2:
 226                         case 3:
 227                         case 4:
 228                                 return 2;
 229                                 break;
 230                         case 5:
 231                         case 6:
 232                                 return 3;
 233                                 break;
 234                         case 7:
 235                         case 8:
 236                                 return 4;
 237                                 break;
 238                         case 9:
 239                                 return 5;
 240                                 break;
 241                         case 10:
 242                         case 11:
 243                         case 12:
 244                                 return 6;
 245                                 break;
 246                         case 13:
 247                                 return 7;
 248                                 break;
 249                         case 14:
 250                         case 15:
 251                                 return 8;
 252                                 break;
 253                 }
 254                 return false;
 255         }
 256
 257         public static function channelArrangementLookup($index) {
 258                 static $lookup = array(
 259                         0  => 'A',
 260                         1  => 'A + B (dual mono)',
 261                         2  => 'L + R (stereo)',
 262                         3  => '(L+R) + (L-R) (sum-difference)',
 263                         4  => 'LT + RT (left and right total)',
 264                         5  => 'C + L + R',
 265                         6  => 'L + R + S',
 266                         7  => 'C + L + R + S',
 267                         8  => 'L + R + SL + SR',
 268                         9  => 'C + L + R + SL + SR',
 269                         10 => 'CL + CR + L + R + SL + SR',
 270                         11 => 'C + L + R+ LR + RR + OV',
 271                         12 => 'CF + CR + LF + RF + LR + RR',
 272                         13 => 'CL + C + CR + L + R + SL + SR',
 273                         14 => 'CL + CR + L + R + SL1 + SL2 + SR1 + SR2',
 274                         15 => 'CL + C+ CR + L + R + SL + S + SR',
 275                 );
 276                 return (isset($lookup[$index]) ? $lookup[$index] : 'user-defined');
 277         }
 278
 279         public static function dialogNormalization($index, $version) {
 280                 switch ($version) {
 281                         case 7:
 282                                 return 0 - $index;
 283                                 break;
 284                         case 6:
 285                                 return 0 - 16 - $index;
 286                                 break;
 287                 }
 288                 return false;
 289         }
 290
 291 }