328 lines
11 KiB
PHP
328 lines
11 KiB
PHP
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<?php
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/////////////////////////////////////////////////////////////////
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/// getID3() by James Heinrich <info@getid3.org> //
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// available at https://github.com/JamesHeinrich/getID3 //
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// or https://www.getid3.org //
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// or http://getid3.sourceforge.net //
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// see readme.txt for more details //
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/////////////////////////////////////////////////////////////////
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// //
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// module.audio.dts.php //
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// module for analyzing DTS Audio files //
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// dependencies: NONE //
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// //
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/////////////////////////////////////////////////////////////////
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if (!defined('GETID3_INCLUDEPATH')) { // prevent path-exposing attacks that access modules directly on public webservers
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exit;
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}
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/**
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* @tutorial http://wiki.multimedia.cx/index.php?title=DTS
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*/
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class getid3_dts extends getid3_handler
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{
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/**
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* Default DTS syncword used in native .cpt or .dts formats.
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*/
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const syncword = "\x7F\xFE\x80\x01";
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/**
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* @var int
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*/
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private $readBinDataOffset = 0;
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/**
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* Possible syncwords indicating bitstream encoding.
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*/
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public static $syncwords = array(
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0 => "\x7F\xFE\x80\x01", // raw big-endian
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1 => "\xFE\x7F\x01\x80", // raw little-endian
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2 => "\x1F\xFF\xE8\x00", // 14-bit big-endian
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3 => "\xFF\x1F\x00\xE8"); // 14-bit little-endian
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/**
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* @return bool
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*/
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public function Analyze() {
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$info = &$this->getid3->info;
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$info['fileformat'] = 'dts';
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$this->fseek($info['avdataoffset']);
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$DTSheader = $this->fread(20); // we only need 2 words magic + 6 words frame header, but these words may be normal 16-bit words OR 14-bit words with 2 highest bits set to zero, so 8 words can be either 8*16/8 = 16 bytes OR 8*16*(16/14)/8 = 18.3 bytes
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// check syncword
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$sync = substr($DTSheader, 0, 4);
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if (($encoding = array_search($sync, self::$syncwords)) !== false) {
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$info['dts']['raw']['magic'] = $sync;
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$this->readBinDataOffset = 32;
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} elseif ($this->isDependencyFor('matroska')) {
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// Matroska contains DTS without syncword encoded as raw big-endian format
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$encoding = 0;
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$this->readBinDataOffset = 0;
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} else {
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unset($info['fileformat']);
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return $this->error('Expecting "'.implode('| ', array_map('getid3_lib::PrintHexBytes', self::$syncwords)).'" at offset '.$info['avdataoffset'].', found "'.getid3_lib::PrintHexBytes($sync).'"');
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}
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// decode header
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$fhBS = '';
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for ($word_offset = 0; $word_offset <= strlen($DTSheader); $word_offset += 2) {
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switch ($encoding) {
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case 0: // raw big-endian
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$fhBS .= getid3_lib::BigEndian2Bin( substr($DTSheader, $word_offset, 2) );
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break;
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case 1: // raw little-endian
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$fhBS .= getid3_lib::BigEndian2Bin(strrev(substr($DTSheader, $word_offset, 2)));
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break;
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case 2: // 14-bit big-endian
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$fhBS .= substr(getid3_lib::BigEndian2Bin( substr($DTSheader, $word_offset, 2) ), 2, 14);
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break;
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case 3: // 14-bit little-endian
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$fhBS .= substr(getid3_lib::BigEndian2Bin(strrev(substr($DTSheader, $word_offset, 2))), 2, 14);
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break;
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}
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}
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$info['dts']['raw']['frame_type'] = $this->readBinData($fhBS, 1);
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$info['dts']['raw']['deficit_samples'] = $this->readBinData($fhBS, 5);
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$info['dts']['flags']['crc_present'] = (bool) $this->readBinData($fhBS, 1);
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$info['dts']['raw']['pcm_sample_blocks'] = $this->readBinData($fhBS, 7);
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$info['dts']['raw']['frame_byte_size'] = $this->readBinData($fhBS, 14);
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$info['dts']['raw']['channel_arrangement'] = $this->readBinData($fhBS, 6);
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$info['dts']['raw']['sample_frequency'] = $this->readBinData($fhBS, 4);
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$info['dts']['raw']['bitrate'] = $this->readBinData($fhBS, 5);
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$info['dts']['flags']['embedded_downmix'] = (bool) $this->readBinData($fhBS, 1);
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$info['dts']['flags']['dynamicrange'] = (bool) $this->readBinData($fhBS, 1);
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$info['dts']['flags']['timestamp'] = (bool) $this->readBinData($fhBS, 1);
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$info['dts']['flags']['auxdata'] = (bool) $this->readBinData($fhBS, 1);
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$info['dts']['flags']['hdcd'] = (bool) $this->readBinData($fhBS, 1);
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$info['dts']['raw']['extension_audio'] = $this->readBinData($fhBS, 3);
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$info['dts']['flags']['extended_coding'] = (bool) $this->readBinData($fhBS, 1);
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$info['dts']['flags']['audio_sync_insertion'] = (bool) $this->readBinData($fhBS, 1);
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$info['dts']['raw']['lfe_effects'] = $this->readBinData($fhBS, 2);
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$info['dts']['flags']['predictor_history'] = (bool) $this->readBinData($fhBS, 1);
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if ($info['dts']['flags']['crc_present']) {
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$info['dts']['raw']['crc16'] = $this->readBinData($fhBS, 16);
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}
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$info['dts']['flags']['mri_perfect_reconst'] = (bool) $this->readBinData($fhBS, 1);
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$info['dts']['raw']['encoder_soft_version'] = $this->readBinData($fhBS, 4);
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$info['dts']['raw']['copy_history'] = $this->readBinData($fhBS, 2);
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$info['dts']['raw']['bits_per_sample'] = $this->readBinData($fhBS, 2);
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$info['dts']['flags']['surround_es'] = (bool) $this->readBinData($fhBS, 1);
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$info['dts']['flags']['front_sum_diff'] = (bool) $this->readBinData($fhBS, 1);
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$info['dts']['flags']['surround_sum_diff'] = (bool) $this->readBinData($fhBS, 1);
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$info['dts']['raw']['dialog_normalization'] = $this->readBinData($fhBS, 4);
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$info['dts']['bitrate'] = self::bitrateLookup($info['dts']['raw']['bitrate']);
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$info['dts']['bits_per_sample'] = self::bitPerSampleLookup($info['dts']['raw']['bits_per_sample']);
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$info['dts']['sample_rate'] = self::sampleRateLookup($info['dts']['raw']['sample_frequency']);
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$info['dts']['dialog_normalization'] = self::dialogNormalization($info['dts']['raw']['dialog_normalization'], $info['dts']['raw']['encoder_soft_version']);
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$info['dts']['flags']['lossless'] = (($info['dts']['raw']['bitrate'] == 31) ? true : false);
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$info['dts']['bitrate_mode'] = (($info['dts']['raw']['bitrate'] == 30) ? 'vbr' : 'cbr');
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$info['dts']['channels'] = self::numChannelsLookup($info['dts']['raw']['channel_arrangement']);
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$info['dts']['channel_arrangement'] = self::channelArrangementLookup($info['dts']['raw']['channel_arrangement']);
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$info['audio']['dataformat'] = 'dts';
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$info['audio']['lossless'] = $info['dts']['flags']['lossless'];
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$info['audio']['bitrate_mode'] = $info['dts']['bitrate_mode'];
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$info['audio']['bits_per_sample'] = $info['dts']['bits_per_sample'];
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$info['audio']['sample_rate'] = $info['dts']['sample_rate'];
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$info['audio']['channels'] = $info['dts']['channels'];
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$info['audio']['bitrate'] = $info['dts']['bitrate'];
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if (isset($info['avdataend']) && !empty($info['dts']['bitrate']) && is_numeric($info['dts']['bitrate'])) {
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$info['playtime_seconds'] = ($info['avdataend'] - $info['avdataoffset']) / ($info['dts']['bitrate'] / 8);
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if (($encoding == 2) || ($encoding == 3)) {
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// 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
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$info['playtime_seconds'] *= (14 / 16);
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}
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}
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return true;
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}
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/**
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* @param string $bin
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* @param int $length
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*
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* @return int
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*/
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private function readBinData($bin, $length) {
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$data = substr($bin, $this->readBinDataOffset, $length);
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$this->readBinDataOffset += $length;
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return bindec($data);
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}
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/**
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* @param int $index
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*
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* @return int|string|false
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*/
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public static function bitrateLookup($index) {
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static $lookup = array(
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0 => 32000,
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1 => 56000,
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2 => 64000,
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3 => 96000,
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4 => 112000,
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5 => 128000,
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6 => 192000,
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7 => 224000,
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8 => 256000,
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9 => 320000,
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10 => 384000,
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11 => 448000,
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12 => 512000,
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13 => 576000,
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14 => 640000,
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15 => 768000,
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16 => 960000,
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17 => 1024000,
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18 => 1152000,
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19 => 1280000,
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20 => 1344000,
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21 => 1408000,
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22 => 1411200,
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23 => 1472000,
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24 => 1536000,
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25 => 1920000,
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26 => 2048000,
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27 => 3072000,
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28 => 3840000,
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29 => 'open',
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30 => 'variable',
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31 => 'lossless',
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);
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return (isset($lookup[$index]) ? $lookup[$index] : false);
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}
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/**
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* @param int $index
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*
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* @return int|string|false
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*/
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public static function sampleRateLookup($index) {
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static $lookup = array(
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0 => 'invalid',
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1 => 8000,
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2 => 16000,
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3 => 32000,
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4 => 'invalid',
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5 => 'invalid',
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6 => 11025,
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7 => 22050,
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8 => 44100,
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9 => 'invalid',
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10 => 'invalid',
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11 => 12000,
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12 => 24000,
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13 => 48000,
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14 => 'invalid',
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15 => 'invalid',
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);
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return (isset($lookup[$index]) ? $lookup[$index] : false);
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}
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/**
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* @param int $index
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*
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* @return int|false
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*/
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public static function bitPerSampleLookup($index) {
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static $lookup = array(
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0 => 16,
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1 => 20,
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2 => 24,
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3 => 24,
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);
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return (isset($lookup[$index]) ? $lookup[$index] : false);
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}
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/**
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* @param int $index
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*
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* @return int|false
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*/
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public static function numChannelsLookup($index) {
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switch ($index) {
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case 0:
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return 1;
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case 1:
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case 2:
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case 3:
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case 4:
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return 2;
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case 5:
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case 6:
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return 3;
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case 7:
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case 8:
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return 4;
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case 9:
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return 5;
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case 10:
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case 11:
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case 12:
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return 6;
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case 13:
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return 7;
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case 14:
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case 15:
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return 8;
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}
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return false;
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}
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/**
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* @param int $index
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*
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* @return string
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*/
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public static function channelArrangementLookup($index) {
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static $lookup = array(
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0 => 'A',
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1 => 'A + B (dual mono)',
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2 => 'L + R (stereo)',
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3 => '(L+R) + (L-R) (sum-difference)',
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4 => 'LT + RT (left and right total)',
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5 => 'C + L + R',
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6 => 'L + R + S',
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7 => 'C + L + R + S',
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8 => 'L + R + SL + SR',
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9 => 'C + L + R + SL + SR',
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10 => 'CL + CR + L + R + SL + SR',
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11 => 'C + L + R+ LR + RR + OV',
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12 => 'CF + CR + LF + RF + LR + RR',
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13 => 'CL + C + CR + L + R + SL + SR',
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14 => 'CL + CR + L + R + SL1 + SL2 + SR1 + SR2',
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15 => 'CL + C+ CR + L + R + SL + S + SR',
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);
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return (isset($lookup[$index]) ? $lookup[$index] : 'user-defined');
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}
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/**
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* @param int $index
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* @param int $version
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*
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* @return int|false
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*/
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public static function dialogNormalization($index, $version) {
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switch ($version) {
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case 7:
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return 0 - $index;
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case 6:
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return 0 - 16 - $index;
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}
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return false;
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}
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}
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