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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: 2 years 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->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;
    }

}

?>