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File: includes/getid3/module.audio.dts.php

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  Classes of Karl Holz  >  WaldScan  >  includes/getid3/module.audio.dts.php  >  Download  
File: includes/getid3/module.audio.dts.php
Role: Auxiliary script
Content type: text/plain
Description: getID3 dependency
Class: WaldScan
Scan directories for files with certain extensions
Author: By
Last change:
Date: 1 year ago
Size: 9,150 bytes
 

Contents

Class file image Download
<?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 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 <macteam@users.sourceforge.net> http://mac.sourceforge.net/atl/

        
$info['fileformat'] = 'dts';

        
fseek($this->getid3->fp$info['avdataoffset'], SEEK_SET);
        
$DTSheader fread($this->getid3->fp16);
        
$info['dts']['raw']['magic'] = substr($DTSheader04);

        
$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$bsOffset14);
        
$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$bsOffset16);
        }
        
$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 
$index;
                break;
            case 
6:
                return 
16 $index;
                break;
        }
        return 
false;
    }

}

?>