249 lines
8.8 KiB
PHP
249 lines
8.8 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 http://getid3.sourceforge.net //
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// or http://www.getid3.org //
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/////////////////////////////////////////////////////////////////
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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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class getid3_dts extends getid3_handler
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{
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const syncword = "\x7F\xFE\x80\x01";
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public function Analyze() {
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$info = &$this->getid3->info;
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// Specs taken from "DTS Coherent Acoustics;Core and Extensions, ETSI TS 102 114 V1.2.1 (2002-12)"
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// (http://pda.etsi.org/pda/queryform.asp)
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// With thanks to Gambit <macteam@users.sourceforge.net> http://mac.sourceforge.net/atl/
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$info['fileformat'] = 'dts';
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$this->fseek($info['avdataoffset']);
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$DTSheader = $this->fread(16);
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if (strpos($DTSheader, self::syncword) === 0) {
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$info['dts']['raw']['magic'] = self::syncword;
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$offset = 4;
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} else {
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if (!$this->isDependencyFor('matroska')) {
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unset($info['fileformat']);
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return $this->error('Expecting "'.getid3_lib::PrintHexBytes(self::syncword).'" at offset '.$info['avdataoffset'].', found "'.getid3_lib::PrintHexBytes(substr($DTSheader, 0, 4)).'"');
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}
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$offset = 0;
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}
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$fhBS = getid3_lib::BigEndian2Bin(substr($DTSheader, $offset, 12));
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$bsOffset = 0;
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$info['dts']['raw']['frame_type'] = $this->readBinData($fhBS, $bsOffset, 1);
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$info['dts']['raw']['deficit_samples'] = $this->readBinData($fhBS, $bsOffset, 5);
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$info['dts']['flags']['crc_present'] = (bool) $this->readBinData($fhBS, $bsOffset, 1);
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$info['dts']['raw']['pcm_sample_blocks'] = $this->readBinData($fhBS, $bsOffset, 7);
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$info['dts']['raw']['frame_byte_size'] = $this->readBinData($fhBS, $bsOffset, 14);
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$info['dts']['raw']['channel_arrangement'] = $this->readBinData($fhBS, $bsOffset, 6);
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$info['dts']['raw']['sample_frequency'] = $this->readBinData($fhBS, $bsOffset, 4);
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$info['dts']['raw']['bitrate'] = $this->readBinData($fhBS, $bsOffset, 5);
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$info['dts']['flags']['embedded_downmix'] = (bool) $this->readBinData($fhBS, $bsOffset, 1);
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$info['dts']['flags']['dynamicrange'] = (bool) $this->readBinData($fhBS, $bsOffset, 1);
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$info['dts']['flags']['timestamp'] = (bool) $this->readBinData($fhBS, $bsOffset, 1);
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$info['dts']['flags']['auxdata'] = (bool) $this->readBinData($fhBS, $bsOffset, 1);
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$info['dts']['flags']['hdcd'] = (bool) $this->readBinData($fhBS, $bsOffset, 1);
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$info['dts']['raw']['extension_audio'] = $this->readBinData($fhBS, $bsOffset, 3);
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$info['dts']['flags']['extended_coding'] = (bool) $this->readBinData($fhBS, $bsOffset, 1);
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$info['dts']['flags']['audio_sync_insertion'] = (bool) $this->readBinData($fhBS, $bsOffset, 1);
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$info['dts']['raw']['lfe_effects'] = $this->readBinData($fhBS, $bsOffset, 2);
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$info['dts']['flags']['predictor_history'] = (bool) $this->readBinData($fhBS, $bsOffset, 1);
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if ($info['dts']['flags']['crc_present']) {
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$info['dts']['raw']['crc16'] = $this->readBinData($fhBS, $bsOffset, 16);
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}
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$info['dts']['flags']['mri_perfect_reconst'] = (bool) $this->readBinData($fhBS, $bsOffset, 1);
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$info['dts']['raw']['encoder_soft_version'] = $this->readBinData($fhBS, $bsOffset, 4);
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$info['dts']['raw']['copy_history'] = $this->readBinData($fhBS, $bsOffset, 2);
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$info['dts']['raw']['bits_per_sample'] = $this->readBinData($fhBS, $bsOffset, 2);
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$info['dts']['flags']['surround_es'] = (bool) $this->readBinData($fhBS, $bsOffset, 1);
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$info['dts']['flags']['front_sum_diff'] = (bool) $this->readBinData($fhBS, $bsOffset, 1);
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$info['dts']['flags']['surround_sum_diff'] = (bool) $this->readBinData($fhBS, $bsOffset, 1);
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$info['dts']['raw']['dialog_normalization'] = $this->readBinData($fhBS, $bsOffset, 4);
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$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'])) {
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$info['playtime_seconds'] = ($info['avdataend'] - $info['avdataoffset']) / ($info['dts']['bitrate'] / 8);
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}
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return true;
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}
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private function readBinData($bin, &$offset, $length) {
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$data = substr($bin, $offset, $length);
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$offset += $length;
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return bindec($data);
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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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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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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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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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break;
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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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break;
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case 5:
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case 6:
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return 3;
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break;
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case 7:
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case 8:
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return 4;
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break;
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case 9:
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return 5;
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break;
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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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break;
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case 13:
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return 7;
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break;
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case 14:
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case 15:
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return 8;
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break;
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}
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return false;
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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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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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break;
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case 6:
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return 0 - 16 - $index;
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break;
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}
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return false;
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}
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}
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