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<?php
/////////////////////////////////////////////////////////////////
/// getID3() by James Heinrich <info@getid3.org> //
// 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
{
function getid3_dts(&$fd, &$ThisFileInfo) {
// 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 <macteam@users.sourceforge.net> http://mac.sourceforge.net/atl/
$ThisFileInfo['fileformat'] = 'dts';
fseek($fd, $ThisFileInfo['avdataoffset'], SEEK_SET);
$DTSheader = fread($fd, 16);
$ThisFileInfo['dts']['raw']['magic'] = getid3_lib::BigEndian2Int(substr($DTSheader, 0, 4));
if ($ThisFileInfo['dts']['raw']['magic'] != 0x7FFE8001) {
$ThisFileInfo['error'][] = 'Expecting "0x7FFE8001" at offset '.$ThisFileInfo['avdataoffset'].', found "0x'.str_pad(strtoupper(dechex($ThisFileInfo['dts']['raw']['magic'])), 8, '0', STR_PAD_LEFT).'"';
unset($ThisFileInfo['fileformat']);
unset($ThisFileInfo['dts']);
return false;
}
$fhBS = getid3_lib::BigEndian2Bin(substr($DTSheader, 4, 12));
$bsOffset = 0;
$ThisFileInfo['dts']['raw']['frame_type'] = bindec(substr($fhBS, $bsOffset, 1)); $bsOffset += 1;
$ThisFileInfo['dts']['raw']['deficit_samples'] = bindec(substr($fhBS, $bsOffset, 5)); $bsOffset += 5;
$ThisFileInfo['dts']['flags']['crc_present'] = (bool) bindec(substr($fhBS, $bsOffset, 1)); $bsOffset += 1;
$ThisFileInfo['dts']['raw']['pcm_sample_blocks'] = bindec(substr($fhBS, $bsOffset, 7)); $bsOffset += 7;
$ThisFileInfo['dts']['raw']['frame_byte_size'] = bindec(substr($fhBS, $bsOffset, 14)); $bsOffset += 14;
$ThisFileInfo['dts']['raw']['channel_arrangement'] = bindec(substr($fhBS, $bsOffset, 6)); $bsOffset += 6;
$ThisFileInfo['dts']['raw']['sample_frequency'] = bindec(substr($fhBS, $bsOffset, 4)); $bsOffset += 4;
$ThisFileInfo['dts']['raw']['bitrate'] = bindec(substr($fhBS, $bsOffset, 5)); $bsOffset += 5;
$ThisFileInfo['dts']['flags']['embedded_downmix'] = (bool) bindec(substr($fhBS, $bsOffset, 1)); $bsOffset += 1;
$ThisFileInfo['dts']['flags']['dynamicrange'] = (bool) bindec(substr($fhBS, $bsOffset, 1)); $bsOffset += 1;
$ThisFileInfo['dts']['flags']['timestamp'] = (bool) bindec(substr($fhBS, $bsOffset, 1)); $bsOffset += 1;
$ThisFileInfo['dts']['flags']['auxdata'] = (bool) bindec(substr($fhBS, $bsOffset, 1)); $bsOffset += 1;
$ThisFileInfo['dts']['flags']['hdcd'] = (bool) bindec(substr($fhBS, $bsOffset, 1)); $bsOffset += 1;
$ThisFileInfo['dts']['raw']['extension_audio'] = bindec(substr($fhBS, $bsOffset, 3)); $bsOffset += 3;
$ThisFileInfo['dts']['flags']['extended_coding'] = (bool) bindec(substr($fhBS, $bsOffset, 1)); $bsOffset += 1;
$ThisFileInfo['dts']['flags']['audio_sync_insertion'] = (bool) bindec(substr($fhBS, $bsOffset, 1)); $bsOffset += 1;
$ThisFileInfo['dts']['raw']['lfe_effects'] = bindec(substr($fhBS, $bsOffset, 2)); $bsOffset += 2;
$ThisFileInfo['dts']['flags']['predictor_history'] = (bool) bindec(substr($fhBS, $bsOffset, 1)); $bsOffset += 1;
if ($ThisFileInfo['dts']['flags']['crc_present']) {
$ThisFileInfo['dts']['raw']['crc16'] = bindec(substr($fhBS, $bsOffset, 16)); $bsOffset += 16;
}
$ThisFileInfo['dts']['flags']['mri_perfect_reconst'] = (bool) bindec(substr($fhBS, $bsOffset, 1)); $bsOffset += 1;
$ThisFileInfo['dts']['raw']['encoder_soft_version'] = bindec(substr($fhBS, $bsOffset, 4)); $bsOffset += 4;
$ThisFileInfo['dts']['raw']['copy_history'] = bindec(substr($fhBS, $bsOffset, 2)); $bsOffset += 2;
$ThisFileInfo['dts']['raw']['bits_per_sample'] = bindec(substr($fhBS, $bsOffset, 2)); $bsOffset += 2;
$ThisFileInfo['dts']['flags']['surround_es'] = (bool) bindec(substr($fhBS, $bsOffset, 1)); $bsOffset += 1;
$ThisFileInfo['dts']['flags']['front_sum_diff'] = (bool) bindec(substr($fhBS, $bsOffset, 1)); $bsOffset += 1;
$ThisFileInfo['dts']['flags']['surround_sum_diff'] = (bool) bindec(substr($fhBS, $bsOffset, 1)); $bsOffset += 1;
$ThisFileInfo['dts']['raw']['dialog_normalization'] = bindec(substr($fhBS, $bsOffset, 4)); $bsOffset += 4;
$ThisFileInfo['dts']['bitrate'] = $this->DTSbitrateLookup($ThisFileInfo['dts']['raw']['bitrate']);
$ThisFileInfo['dts']['bits_per_sample'] = $this->DTSbitPerSampleLookup($ThisFileInfo['dts']['raw']['bits_per_sample']);
$ThisFileInfo['dts']['sample_rate'] = $this->DTSsampleRateLookup($ThisFileInfo['dts']['raw']['sample_frequency']);
$ThisFileInfo['dts']['dialog_normalization'] = $this->DTSdialogNormalization($ThisFileInfo['dts']['raw']['dialog_normalization'], $ThisFileInfo['dts']['raw']['encoder_soft_version']);
$ThisFileInfo['dts']['flags']['lossless'] = (($ThisFileInfo['dts']['raw']['bitrate'] == 31) ? true : false);
$ThisFileInfo['dts']['bitrate_mode'] = (($ThisFileInfo['dts']['raw']['bitrate'] == 30) ? 'vbr' : 'cbr');
$ThisFileInfo['dts']['channels'] = $this->DTSnumChannelsLookup($ThisFileInfo['dts']['raw']['channel_arrangement']);
$ThisFileInfo['dts']['channel_arrangement'] = $this->DTSchannelArrangementLookup($ThisFileInfo['dts']['raw']['channel_arrangement']);
$ThisFileInfo['audio']['dataformat'] = 'dts';
$ThisFileInfo['audio']['lossless'] = $ThisFileInfo['dts']['flags']['lossless'];
$ThisFileInfo['audio']['bitrate_mode'] = $ThisFileInfo['dts']['bitrate_mode'];
$ThisFileInfo['audio']['bits_per_sample'] = $ThisFileInfo['dts']['bits_per_sample'];
$ThisFileInfo['audio']['sample_rate'] = $ThisFileInfo['dts']['sample_rate'];
$ThisFileInfo['audio']['channels'] = $ThisFileInfo['dts']['channels'];
$ThisFileInfo['audio']['bitrate'] = $ThisFileInfo['dts']['bitrate'];
if (isset($ThisFileInfo['avdataend'])) {
$ThisFileInfo['playtime_seconds'] = ($ThisFileInfo['avdataend'] - $ThisFileInfo['avdataoffset']) / ($ThisFileInfo['dts']['bitrate'] / 8);
}
return true;
}
function DTSbitrateLookup($index) {
$DTSbitrateLookup = array(
0 => 32000,
1 => 56000,
2 => 64000,
3 => 96000,
4 => 112000,
5 => 128000,
6 => 192000,
7 => 224000,
8 => 256000,
9 => 320000,
10 => 384000,
11 => 448000,
12 => 512000,
13 => 576000,
14 => 640000,
15 => 768000,
16 => 960000,
17 => 1024000,
18 => 1152000,
19 => 1280000,
20 => 1344000,
21 => 1408000,
22 => 1411200,
23 => 1472000,
24 => 1536000,
25 => 1920000,
26 => 2048000,
27 => 3072000,
28 => 3840000,
29 => 'open',
30 => 'variable',
31 => 'lossless'
);
return @$DTSbitrateLookup[$index];
}
function DTSsampleRateLookup($index) {
$DTSsampleRateLookup = array(
0 => 'invalid',
1 => 8000,
2 => 16000,
3 => 32000,
4 => 'invalid',
5 => 'invalid',
6 => 11025,
7 => 22050,
8 => 44100,
9 => 'invalid',
10 => 'invalid',
11 => 12000,
12 => 24000,
13 => 48000,
14 => 'invalid',
15 => 'invalid'
);
return @$DTSsampleRateLookup[$index];
}
function DTSbitPerSampleLookup($index) {
$DTSbitPerSampleLookup = array(
0 => 16,
1 => 20,
2 => 24,
3 => 24,
);
return @$DTSbitPerSampleLookup[$index];
}
function DTSnumChannelsLookup($index) {
switch ($index) {
case 0:
return 1;
break;
case 1:
case 2:
case 3:
case 4:
return 2;
break;
case 5:
case 6:
return 3;
break;
case 7:
case 8:
return 4;
break;
case 9:
return 5;
break;
case 10:
case 11:
case 12:
return 6;
break;
case 13:
return 7;
break;
case 14:
case 15:
return 8;
break;
}
return false;
}
function DTSchannelArrangementLookup($index) {
$DTSchannelArrangementLookup = array(
0 => 'A',
1 => 'A + B (dual mono)',
2 => 'L + R (stereo)',
3 => '(L+R) + (L-R) (sum-difference)',
4 => 'LT + RT (left and right total)',
5 => 'C + L + R',
6 => 'L + R + S',
7 => 'C + L + R + S',
8 => 'L + R + SL + SR',
9 => 'C + L + R + SL + SR',
10 => 'CL + CR + L + R + SL + SR',
11 => 'C + L + R+ LR + RR + OV',
12 => 'CF + CR + LF + RF + LR + RR',
13 => 'CL + C + CR + L + R + SL + SR',
14 => 'CL + CR + L + R + SL1 + SL2 + SR1 + SR2',
15 => 'CL + C+ CR + L + R + SL + S + SR',
);
return (@$DTSchannelArrangementLookup[$index] ? @$DTSchannelArrangementLookup[$index] : 'user-defined');
}
function DTSdialogNormalization($index, $version) {
switch ($version) {
case 7:
return 0 - $index;
break;
case 6:
return 0 - 16 - $index;
break;
}
return false;
}
}
?>
|
