<?php
/////////////////////////////////////////////////////////////////
/// getID3() by James Heinrich <[email protected]> //
// available at http://getid3.sourceforge.net //
// or http://www.getid3.org //
/////////////////////////////////////////////////////////////////
// See readme.txt for more details //
/////////////////////////////////////////////////////////////////
// //
// module.audio.dts.php //
// module for analyzing DTS Audio files //
// dependencies: NONE //
// //
/////////////////////////////////////////////////////////////////
class getid3_dts extends getid3_handler
{
public function Analyze() {
$info = &$this->getid3->info;
// Specs taken from "DTS Coherent Acoustics;Core and Extensions, ETSI TS 102 114 V1.2.1 (2002-12)"
// (http://pda.etsi.org/pda/queryform.asp)
// With thanks to Gambit <[email protected]> http://mac.sourceforge.net/atl/
$info['fileformat'] = 'dts';
fseek($this->getid3->fp, $info['avdataoffset'], SEEK_SET);
$DTSheader = fread($this->getid3->fp, 16);
$info['dts']['raw']['magic'] = substr($DTSheader, 0, 4);
$magic = "\x7F\xFE\x80\x01";
if ($info['dts']['raw']['magic'] != $magic) {
$info['error'][] = 'Expecting "'.getid3_lib::PrintHexBytes($magic).'" at offset '.$info['avdataoffset'].', found "'.getid3_lib::PrintHexBytes($info['dts']['raw']['magic']).'"';
unset($info['fileformat'], $info['dts']);
return false;
}
$fhBS = getid3_lib::BigEndian2Bin(substr($DTSheader, 4, 12));
$bsOffset = 0;
$info['dts']['raw']['frame_type'] = $this->readBinData($fhBS, $bsOffset, 1);
$info['dts']['raw']['deficit_samples'] = $this->readBinData($fhBS, $bsOffset, 5);
$info['dts']['flags']['crc_present'] = (bool) $this->readBinData($fhBS, $bsOffset, 1);
$info['dts']['raw']['pcm_sample_blocks'] = $this->readBinData($fhBS, $bsOffset, 7);
$info['dts']['raw']['frame_byte_size'] = $this->readBinData($fhBS, $bsOffset, 14);
$info['dts']['raw']['channel_arrangement'] = $this->readBinData($fhBS, $bsOffset, 6);
$info['dts']['raw']['sample_frequency'] = $this->readBinData($fhBS, $bsOffset, 4);
$info['dts']['raw']['bitrate'] = $this->readBinData($fhBS, $bsOffset, 5);
$info['dts']['flags']['embedded_downmix'] = (bool) $this->readBinData($fhBS, $bsOffset, 1);
$info['dts']['flags']['dynamicrange'] = (bool) $this->readBinData($fhBS, $bsOffset, 1);
$info['dts']['flags']['timestamp'] = (bool) $this->readBinData($fhBS, $bsOffset, 1);
$info['dts']['flags']['auxdata'] = (bool) $this->readBinData($fhBS, $bsOffset, 1);
$info['dts']['flags']['hdcd'] = (bool) $this->readBinData($fhBS, $bsOffset, 1);
$info['dts']['raw']['extension_audio'] = $this->readBinData($fhBS, $bsOffset, 3);
$info['dts']['flags']['extended_coding'] = (bool) $this->readBinData($fhBS, $bsOffset, 1);
$info['dts']['flags']['audio_sync_insertion'] = (bool) $this->readBinData($fhBS, $bsOffset, 1);
$info['dts']['raw']['lfe_effects'] = $this->readBinData($fhBS, $bsOffset, 2);
$info['dts']['flags']['predictor_history'] = (bool) $this->readBinData($fhBS, $bsOffset, 1);
if ($info['dts']['flags']['crc_present']) {
$info['dts']['raw']['crc16'] = $this->readBinData($fhBS, $bsOffset, 16);
}
$info['dts']['flags']['mri_perfect_reconst'] = (bool) $this->readBinData($fhBS, $bsOffset, 1);
$info['dts']['raw']['encoder_soft_version'] = $this->readBinData($fhBS, $bsOffset, 4);
$info['dts']['raw']['copy_history'] = $this->readBinData($fhBS, $bsOffset, 2);
$info['dts']['raw']['bits_per_sample'] = $this->readBinData($fhBS, $bsOffset, 2);
$info['dts']['flags']['surround_es'] = (bool) $this->readBinData($fhBS, $bsOffset, 1);
$info['dts']['flags']['front_sum_diff'] = (bool) $this->readBinData($fhBS, $bsOffset, 1);
$info['dts']['flags']['surround_sum_diff'] = (bool) $this->readBinData($fhBS, $bsOffset, 1);
$info['dts']['raw']['dialog_normalization'] = $this->readBinData($fhBS, $bsOffset, 4);
$info['dts']['bitrate'] = self::DTSbitrateLookup($info['dts']['raw']['bitrate']);
$info['dts']['bits_per_sample'] = self::DTSbitPerSampleLookup($info['dts']['raw']['bits_per_sample']);
$info['dts']['sample_rate'] = self::DTSsampleRateLookup($info['dts']['raw']['sample_frequency']);
$info['dts']['dialog_normalization'] = self::DTSdialogNormalization($info['dts']['raw']['dialog_normalization'], $info['dts']['raw']['encoder_soft_version']);
$info['dts']['flags']['lossless'] = (($info['dts']['raw']['bitrate'] == 31) ? true : false);
$info['dts']['bitrate_mode'] = (($info['dts']['raw']['bitrate'] == 30) ? 'vbr' : 'cbr');
$info['dts']['channels'] = self::DTSnumChannelsLookup($info['dts']['raw']['channel_arrangement']);
$info['dts']['channel_arrangement'] = self::DTSchannelArrangementLookup($info['dts']['raw']['channel_arrangement']);
$info['audio']['dataformat'] = 'dts';
$info['audio']['lossless'] = $info['dts']['flags']['lossless'];
$info['audio']['bitrate_mode'] = $info['dts']['bitrate_mode'];
$info['audio']['bits_per_sample'] = $info['dts']['bits_per_sample'];
$info['audio']['sample_rate'] = $info['dts']['sample_rate'];
$info['audio']['channels'] = $info['dts']['channels'];
$info['audio']['bitrate'] = $info['dts']['bitrate'];
if (isset($info['avdataend'])) {
$info['playtime_seconds'] = ($info['avdataend'] - $info['avdataoffset']) / ($info['dts']['bitrate'] / 8);
}
return true;
}
private function readBinData($bin, &$offset, $length) {
$data = substr($bin, $offset, $length);
$offset += $length;
return bindec($data);
}
private static function DTSbitrateLookup($index) {
$DTSbitrateLookup = array(
0 => 32000,
1 => 56000,
2 => 64000,
3 => 96000,
4 => 112000,
5 => 128000,
6 => 192000,
7 => 224000,
8 => 256000,
9 => 320000,
10 => 384000,
11 => 448000,
12 => 512000,
13 => 576000,
14 => 640000,
15 => 768000,
16 => 960000,
17 => 1024000,
18 => 1152000,
19 => 1280000,
20 => 1344000,
21 => 1408000,
22 => 1411200,
23 => 1472000,
24 => 1536000,
25 => 1920000,
26 => 2048000,
27 => 3072000,
28 => 3840000,
29 => 'open',
30 => 'variable',
31 => 'lossless'
);
return (isset($DTSbitrateLookup[$index]) ? $DTSbitrateLookup[$index] : false);
}
private static function DTSsampleRateLookup($index) {
$DTSsampleRateLookup = array(
0 => 'invalid',
1 => 8000,
2 => 16000,
3 => 32000,
4 => 'invalid',
5 => 'invalid',
6 => 11025,
7 => 22050,
8 => 44100,
9 => 'invalid',
10 => 'invalid',
11 => 12000,
12 => 24000,
13 => 48000,
14 => 'invalid',
15 => 'invalid'
);
return (isset($DTSsampleRateLookup[$index]) ? $DTSsampleRateLookup[$index] : false);
}
private static function DTSbitPerSampleLookup($index) {
$DTSbitPerSampleLookup = array(
0 => 16,
1 => 20,
2 => 24,
3 => 24,
);
return (isset($DTSbitPerSampleLookup[$index]) ? $DTSbitPerSampleLookup[$index] : false);
}
private static function DTSnumChannelsLookup($index) {
switch ($index) {
case 0:
return 1;
break;
case 1:
case 2:
case 3:
case 4:
return 2;
break;
case 5:
case 6:
return 3;
break;
case 7:
case 8:
return 4;
break;
case 9:
return 5;
break;
case 10:
case 11:
case 12:
return 6;
break;
case 13:
return 7;
break;
case 14:
case 15:
return 8;
break;
}
return false;
}
private static function DTSchannelArrangementLookup($index) {
$DTSchannelArrangementLookup = array(
0 => 'A',
1 => 'A + B (dual mono)',
2 => 'L + R (stereo)',
3 => '(L+R) + (L-R) (sum-difference)',
4 => 'LT + RT (left and right total)',
5 => 'C + L + R',
6 => 'L + R + S',
7 => 'C + L + R + S',
8 => 'L + R + SL + SR',
9 => 'C + L + R + SL + SR',
10 => 'CL + CR + L + R + SL + SR',
11 => 'C + L + R+ LR + RR + OV',
12 => 'CF + CR + LF + RF + LR + RR',
13 => 'CL + C + CR + L + R + SL + SR',
14 => 'CL + CR + L + R + SL1 + SL2 + SR1 + SR2',
15 => 'CL + C+ CR + L + R + SL + S + SR',
);
return (isset($DTSchannelArrangementLookup[$index]) ? $DTSchannelArrangementLookup[$index] : 'user-defined');
}
private static function DTSdialogNormalization($index, $version) {
switch ($version) {
case 7:
return 0 - $index;
break;
case 6:
return 0 - 16 - $index;
break;
}
return false;
}
}
?>
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