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ampache/modules/getid3/module.audio.dts.php

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<?php
// +----------------------------------------------------------------------+
// | PHP version 5 |
// +----------------------------------------------------------------------+
// | Copyright (c) 2002-2006 James Heinrich, Allan Hansen |
// +----------------------------------------------------------------------+
// | This source file is subject to version 2 of the GPL license, |
// | that is bundled with this package in the file license.txt and is |
// | available through the world-wide-web at the following url: |
// | http://www.gnu.org/copyleft/gpl.html |
// +----------------------------------------------------------------------+
// | getID3() - http://getid3.sourceforge.net or http://www.getid3.org |
// +----------------------------------------------------------------------+
// | Authors: James Heinrich <infoØgetid3*org> |
// | Allan Hansen <ahØartemis*dk> |
// +----------------------------------------------------------------------+
// | module.audio.dts.php |
// | Module for analyzing DTS audio files |
// | dependencies: NONE |
// +----------------------------------------------------------------------+
//
// $Id: module.audio.dts.php,v 1.2 2006/11/16 13:14:26 ah Exp $
// 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/
class getid3_dts extends getid3_handler
{
public function Analyze() {
$getid3 = $this->getid3;
$getid3->info['dts'] = array ();
$info_dts = &$getid3->info['dts'];
$getid3->info['fileformat'] = 'dts';
fseek($getid3->fp, $getid3->info['avdataoffset'], SEEK_SET);
$header = fread($getid3->fp, 16);
$fhBS = getid3_lib::BigEndian2Bin(substr($header, 4, 12));
$bs_offset = 0;
$info_dts['raw']['frame_type'] = bindec(substr($fhBS, $bs_offset, 1)); $bs_offset += 1;
$info_dts['raw']['deficit_samples'] = bindec(substr($fhBS, $bs_offset, 5)); $bs_offset += 5;
$info_dts['flags']['crc_present'] = (bool) bindec(substr($fhBS, $bs_offset, 1)); $bs_offset += 1;
$info_dts['raw']['pcm_sample_blocks'] = bindec(substr($fhBS, $bs_offset, 7)); $bs_offset += 7;
$info_dts['raw']['frame_byte_size'] = bindec(substr($fhBS, $bs_offset, 14)); $bs_offset += 14;
$info_dts['raw']['channel_arrangement'] = bindec(substr($fhBS, $bs_offset, 6)); $bs_offset += 6;
$info_dts['raw']['sample_frequency'] = bindec(substr($fhBS, $bs_offset, 4)); $bs_offset += 4;
$info_dts['raw']['bitrate'] = bindec(substr($fhBS, $bs_offset, 5)); $bs_offset += 5;
$info_dts['flags']['embedded_downmix'] = (bool) bindec(substr($fhBS, $bs_offset, 1)); $bs_offset += 1;
$info_dts['flags']['dynamicrange'] = (bool) bindec(substr($fhBS, $bs_offset, 1)); $bs_offset += 1;
$info_dts['flags']['timestamp'] = (bool) bindec(substr($fhBS, $bs_offset, 1)); $bs_offset += 1;
$info_dts['flags']['auxdata'] = (bool) bindec(substr($fhBS, $bs_offset, 1)); $bs_offset += 1;
$info_dts['flags']['hdcd'] = (bool) bindec(substr($fhBS, $bs_offset, 1)); $bs_offset += 1;
$info_dts['raw']['extension_audio'] = bindec(substr($fhBS, $bs_offset, 3)); $bs_offset += 3;
$info_dts['flags']['extended_coding'] = (bool) bindec(substr($fhBS, $bs_offset, 1)); $bs_offset += 1;
$info_dts['flags']['audio_sync_insertion'] = (bool) bindec(substr($fhBS, $bs_offset, 1)); $bs_offset += 1;
$info_dts['raw']['lfe_effects'] = bindec(substr($fhBS, $bs_offset, 2)); $bs_offset += 2;
$info_dts['flags']['predictor_history'] = (bool) bindec(substr($fhBS, $bs_offset, 1)); $bs_offset += 1;
if ($info_dts['flags']['crc_present']) {
$info_dts['raw']['crc16'] = bindec(substr($fhBS, $bs_offset, 16)); $bs_offset += 16;
}
$info_dts['flags']['mri_perfect_reconst'] = (bool) bindec(substr($fhBS, $bs_offset, 1)); $bs_offset += 1;
$info_dts['raw']['encoder_soft_version'] = bindec(substr($fhBS, $bs_offset, 4)); $bs_offset += 4;
$info_dts['raw']['copy_history'] = bindec(substr($fhBS, $bs_offset, 2)); $bs_offset += 2;
$info_dts['raw']['bits_per_sample'] = bindec(substr($fhBS, $bs_offset, 2)); $bs_offset += 2;
$info_dts['flags']['surround_es'] = (bool) bindec(substr($fhBS, $bs_offset, 1)); $bs_offset += 1;
$info_dts['flags']['front_sum_diff'] = (bool) bindec(substr($fhBS, $bs_offset, 1)); $bs_offset += 1;
$info_dts['flags']['surround_sum_diff'] = (bool) bindec(substr($fhBS, $bs_offset, 1)); $bs_offset += 1;
$info_dts['raw']['dialog_normalization'] = bindec(substr($fhBS, $bs_offset, 4)); $bs_offset += 4;
$info_dts['bitrate'] = $this->DTSbitrateLookup($info_dts['raw']['bitrate']);
$info_dts['bits_per_sample'] = $this->DTSbitPerSampleLookup($info_dts['raw']['bits_per_sample']);
$info_dts['sample_rate'] = $this->DTSsampleRateLookup($info_dts['raw']['sample_frequency']);
$info_dts['dialog_normalization'] = $this->DTSdialogNormalization($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'] = $this->DTSnumChannelsLookup($info_dts['raw']['channel_arrangement']);
$info_dts['channel_arrangement'] = $this->DTSchannelArrangementLookup($info_dts['raw']['channel_arrangement']);
$getid3->info['audio']['dataformat'] = 'dts';
$getid3->info['audio']['lossless'] = $info_dts['flags']['lossless'];
$getid3->info['audio']['bitrate_mode'] = $info_dts['bitrate_mode'];
$getid3->info['audio']['bits_per_sample'] = $info_dts['bits_per_sample'];
$getid3->info['audio']['sample_rate'] = $info_dts['sample_rate'];
$getid3->info['audio']['channels'] = $info_dts['channels'];
$getid3->info['audio']['bitrate'] = $info_dts['bitrate'];
$getid3->info['playtime_seconds'] = ($getid3->info['avdataend'] - $getid3->info['avdataoffset']) / ($info_dts['bitrate'] / 8);
return true;
}
public static function DTSbitrateLookup($index) {
static $lookup = array (
0 => 32000,
1 => 56000,
2 => 64000,
3 => 96000,
4 => 112000,
5 => 128000,
6 => 192000,
7 => 224000,
8 => 256000,
9 => 320000,
10 => 384000,
11 => 448000,
12 => 512000,
13 => 576000,
14 => 640000,
15 => 768000,
16 => 960000,
17 => 1024000,
18 => 1152000,
19 => 1280000,
20 => 1344000,
21 => 1408000,
22 => 1411200,
23 => 1472000,
24 => 1536000,
25 => 1920000,
26 => 2048000,
27 => 3072000,
28 => 3840000,
29 => 'open',
30 => 'variable',
31 => 'lossless'
);
return @$lookup[$index];
}
public static function DTSsampleRateLookup($index) {
static $lookup = array (
0 => 'invalid',
1 => 8000,
2 => 16000,
3 => 32000,
4 => 'invalid',
5 => 'invalid',
6 => 11025,
7 => 22050,
8 => 44100,
9 => 'invalid',
10 => 'invalid',
11 => 12000,
12 => 24000,
13 => 48000,
14 => 'invalid',
15 => 'invalid'
);
return @$lookup[$index];
}
public static function DTSbitPerSampleLookup($index) {
static $lookup = array (
0 => 16,
1 => 20,
2 => 24,
3 => 24,
);
return @$lookup[$index];
}
public static function DTSnumChannelsLookup($index) {
switch ($index) {
case 0:
return 1;
case 1:
case 2:
case 3:
case 4:
return 2;
case 5:
case 6:
return 3;
case 7:
case 8:
return 4;
case 9:
return 5;
case 10:
case 11:
case 12:
return 6;
case 13:
return 7;
case 14:
case 15:
return 8;
}
return false;
}
public static function DTSchannelArrangementLookup($index) {
static $lookup = array (
0 => 'A',
1 => 'A + B (dual mono)',
2 => 'L + R (stereo)',
3 => '(L+R) + (L-R) (sum-difference)',
4 => 'LT + RT (left and right total)',
5 => 'C + L + R',
6 => 'L + R + S',
7 => 'C + L + R + S',
8 => 'L + R + SL + SR',
9 => 'C + L + R + SL + SR',
10 => 'CL + CR + L + R + SL + SR',
11 => 'C + L + R+ LR + RR + OV',
12 => 'CF + CR + LF + RF + LR + RR',
13 => 'CL + C + CR + L + R + SL + SR',
14 => 'CL + CR + L + R + SL1 + SL2 + SR1 + SR2',
15 => 'CL + C+ CR + L + R + SL + S + SR',
);
return (@$lookup[$index] ? @$lookup[$index] : 'user-defined');
}
public static function DTSdialogNormalization($index, $version) {
switch ($version) {
case 7:
return 0 - $index;
case 6:
return 0 - 16 - $index;
}
return false;
}
}
?>
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