mirror of
https://github.com/janunger/rheinwerk-video-training.git
synced 2024-12-22 20:53:42 +01:00
292 lines
10 KiB
PHP
292 lines
10 KiB
PHP
|
<?php
|
||
|
|
/////////////////////////////////////////////////////////////////
|
||
|
|
/// getID3() by James Heinrich <info@getid3.org> //
|
||
|
|
// available at http://getid3.sourceforge.net //
|
||
|
|
// or http://www.getid3.org //
|
||
|
|
// also https://github.com/JamesHeinrich/getID3 //
|
||
|
|
/////////////////////////////////////////////////////////////////
|
||
|
|
// See readme.txt for more details //
|
||
|
|
/////////////////////////////////////////////////////////////////
|
||
|
|
// //
|
||
|
|
// module.audio.dts.php //
|
||
|
|
// module for analyzing DTS Audio files //
|
||
|
|
// dependencies: NONE //
|
||
|
|
// //
|
||
|
|
/////////////////////////////////////////////////////////////////
|
||
|
|
|
||
|
|
|
||
|
|
/**
|
||
|
|
* @tutorial http://wiki.multimedia.cx/index.php?title=DTS
|
||
|
|
*/
|
||
|
|
class getid3_dts extends getid3_handler
|
||
|
|
{
|
||
|
|
/**
|
||
|
|
* Default DTS syncword used in native .cpt or .dts formats
|
||
|
|
*/
|
||
|
|
const syncword = "\x7F\xFE\x80\x01";
|
||
|
|
|
||
|
|
private $readBinDataOffset = 0;
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Possible syncwords indicating bitstream encoding
|
||
|
|
*/
|
||
|
|
public static $syncwords = array(
|
||
|
|
0 => "\x7F\xFE\x80\x01", // raw big-endian
|
||
|
|
1 => "\xFE\x7F\x01\x80", // raw little-endian
|
||
|
|
2 => "\x1F\xFF\xE8\x00", // 14-bit big-endian
|
||
|
|
3 => "\xFF\x1F\x00\xE8"); // 14-bit little-endian
|
||
|
|
|
||
|
|
public function Analyze() {
|
||
|
|
$info = &$this->getid3->info;
|
||
|
|
$info['fileformat'] = 'dts';
|
||
|
|
|
||
|
|
$this->fseek($info['avdataoffset']);
|
||
|
|
$DTSheader = $this->fread(20); // we only need 2 words magic + 6 words frame header, but these words may be normal 16-bit words OR 14-bit words with 2 highest bits set to zero, so 8 words can be either 8*16/8 = 16 bytes OR 8*16*(16/14)/8 = 18.3 bytes
|
||
|
|
|
||
|
|
// check syncword
|
||
|
|
$sync = substr($DTSheader, 0, 4);
|
||
|
|
if (($encoding = array_search($sync, self::$syncwords)) !== false) {
|
||
|
|
|
||
|
|
$info['dts']['raw']['magic'] = $sync;
|
||
|
|
$this->readBinDataOffset = 32;
|
||
|
|
|
||
|
|
} elseif ($this->isDependencyFor('matroska')) {
|
||
|
|
|
||
|
|
// Matroska contains DTS without syncword encoded as raw big-endian format
|
||
|
|
$encoding = 0;
|
||
|
|
$this->readBinDataOffset = 0;
|
||
|
|
|
||
|
|
} else {
|
||
|
|
|
||
|
|
unset($info['fileformat']);
|
||
|
|
return $this->error('Expecting "'.implode('| ', array_map('getid3_lib::PrintHexBytes', self::$syncwords)).'" at offset '.$info['avdataoffset'].', found "'.getid3_lib::PrintHexBytes($sync).'"');
|
||
|
|
|
||
|
|
}
|
||
|
|
|
||
|
|
// decode header
|
||
|
|
$fhBS = '';
|
||
|
|
for ($word_offset = 0; $word_offset <= strlen($DTSheader); $word_offset += 2) {
|
||
|
|
switch ($encoding) {
|
||
|
|
case 0: // raw big-endian
|
||
|
|
$fhBS .= getid3_lib::BigEndian2Bin( substr($DTSheader, $word_offset, 2) );
|
||
|
|
break;
|
||
|
|
case 1: // raw little-endian
|
||
|
|
$fhBS .= getid3_lib::BigEndian2Bin(strrev(substr($DTSheader, $word_offset, 2)));
|
||
|
|
break;
|
||
|
|
case 2: // 14-bit big-endian
|
||
|
|
$fhBS .= substr(getid3_lib::BigEndian2Bin( substr($DTSheader, $word_offset, 2) ), 2, 14);
|
||
|
|
break;
|
||
|
|
case 3: // 14-bit little-endian
|
||
|
|
$fhBS .= substr(getid3_lib::BigEndian2Bin(strrev(substr($DTSheader, $word_offset, 2))), 2, 14);
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
$info['dts']['raw']['frame_type'] = $this->readBinData($fhBS, 1);
|
||
|
|
$info['dts']['raw']['deficit_samples'] = $this->readBinData($fhBS, 5);
|
||
|
|
$info['dts']['flags']['crc_present'] = (bool) $this->readBinData($fhBS, 1);
|
||
|
|
$info['dts']['raw']['pcm_sample_blocks'] = $this->readBinData($fhBS, 7);
|
||
|
|
$info['dts']['raw']['frame_byte_size'] = $this->readBinData($fhBS, 14);
|
||
|
|
$info['dts']['raw']['channel_arrangement'] = $this->readBinData($fhBS, 6);
|
||
|
|
$info['dts']['raw']['sample_frequency'] = $this->readBinData($fhBS, 4);
|
||
|
|
$info['dts']['raw']['bitrate'] = $this->readBinData($fhBS, 5);
|
||
|
|
$info['dts']['flags']['embedded_downmix'] = (bool) $this->readBinData($fhBS, 1);
|
||
|
|
$info['dts']['flags']['dynamicrange'] = (bool) $this->readBinData($fhBS, 1);
|
||
|
|
$info['dts']['flags']['timestamp'] = (bool) $this->readBinData($fhBS, 1);
|
||
|
|
$info['dts']['flags']['auxdata'] = (bool) $this->readBinData($fhBS, 1);
|
||
|
|
$info['dts']['flags']['hdcd'] = (bool) $this->readBinData($fhBS, 1);
|
||
|
|
$info['dts']['raw']['extension_audio'] = $this->readBinData($fhBS, 3);
|
||
|
|
$info['dts']['flags']['extended_coding'] = (bool) $this->readBinData($fhBS, 1);
|
||
|
|
$info['dts']['flags']['audio_sync_insertion'] = (bool) $this->readBinData($fhBS, 1);
|
||
|
|
$info['dts']['raw']['lfe_effects'] = $this->readBinData($fhBS, 2);
|
||
|
|
$info['dts']['flags']['predictor_history'] = (bool) $this->readBinData($fhBS, 1);
|
||
|
|
if ($info['dts']['flags']['crc_present']) {
|
||
|
|
$info['dts']['raw']['crc16'] = $this->readBinData($fhBS, 16);
|
||
|
|
}
|
||
|
|
$info['dts']['flags']['mri_perfect_reconst'] = (bool) $this->readBinData($fhBS, 1);
|
||
|
|
$info['dts']['raw']['encoder_soft_version'] = $this->readBinData($fhBS, 4);
|
||
|
|
$info['dts']['raw']['copy_history'] = $this->readBinData($fhBS, 2);
|
||
|
|
$info['dts']['raw']['bits_per_sample'] = $this->readBinData($fhBS, 2);
|
||
|
|
$info['dts']['flags']['surround_es'] = (bool) $this->readBinData($fhBS, 1);
|
||
|
|
$info['dts']['flags']['front_sum_diff'] = (bool) $this->readBinData($fhBS, 1);
|
||
|
|
$info['dts']['flags']['surround_sum_diff'] = (bool) $this->readBinData($fhBS, 1);
|
||
|
|
$info['dts']['raw']['dialog_normalization'] = $this->readBinData($fhBS, 4);
|
||
|
|
|
||
|
|
|
||
|
|
$info['dts']['bitrate'] = self::bitrateLookup($info['dts']['raw']['bitrate']);
|
||
|
|
$info['dts']['bits_per_sample'] = self::bitPerSampleLookup($info['dts']['raw']['bits_per_sample']);
|
||
|
|
$info['dts']['sample_rate'] = self::sampleRateLookup($info['dts']['raw']['sample_frequency']);
|
||
|
|
$info['dts']['dialog_normalization'] = self::dialogNormalization($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');
|
||
|
|
$info['dts']['channels'] = self::numChannelsLookup($info['dts']['raw']['channel_arrangement']);
|
||
|
|
$info['dts']['channel_arrangement'] = self::channelArrangementLookup($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']) && !empty($info['dts']['bitrate']) && is_numeric($info['dts']['bitrate'])) {
|
||
|
|
$info['playtime_seconds'] = ($info['avdataend'] - $info['avdataoffset']) / ($info['dts']['bitrate'] / 8);
|
||
|
|
if (($encoding == 2) || ($encoding == 3)) {
|
||
|
|
// 14-bit data packed into 16-bit words, so the playtime is wrong because only (14/16) of the bytes in the data portion of the file are used at the specified bitrate
|
||
|
|
$info['playtime_seconds'] *= (14 / 16);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
return true;
|
||
|
|
}
|
||
|
|
|
||
|
|
private function readBinData($bin, $length) {
|
||
|
|
$data = substr($bin, $this->readBinDataOffset, $length);
|
||
|
|
$this->readBinDataOffset += $length;
|
||
|
|
|
||
|
|
return bindec($data);
|
||
|
|
}
|
||
|
|
|
||
|
|
public static function bitrateLookup($index) {
|
||
|
|
static $lookup = array(
|
||
|
|
0 => 32000,
|
||
|
|
1 => 56000,
|
||
|
|
2 => 64000,
|
||
|
|
3 => 96000,
|
||
|
|
4 => 112000,
|
||
|
|
5 => 128000,
|
||
|
|
6 => 192000,
|
||
|
|
7 => 224000,
|
||
|
|
8 => 256000,
|
||
|
|
9 => 320000,
|
||
|
|
10 => 384000,
|
||
|
|
11 => 448000,
|
||
|
|
12 => 512000,
|
||
|
|
13 => 576000,
|
||
|
|
14 => 640000,
|
||
|
|
15 => 768000,
|
||
|
|
16 => 960000,
|
||
|
|
17 => 1024000,
|
||
|
|
18 => 1152000,
|
||
|
|
19 => 1280000,
|
||
|
|
20 => 1344000,
|
||
|
|
21 => 1408000,
|
||
|
|
22 => 1411200,
|
||
|
|
23 => 1472000,
|
||
|
|
24 => 1536000,
|
||
|
|
25 => 1920000,
|
||
|
|
26 => 2048000,
|
||
|
|
27 => 3072000,
|
||
|
|
28 => 3840000,
|
||
|
|
29 => 'open',
|
||
|
|
30 => 'variable',
|
||
|
|
31 => 'lossless',
|
||
|
|
);
|
||
|
|
return (isset($lookup[$index]) ? $lookup[$index] : false);
|
||
|
|
}
|
||
|
|
|
||
|
|
public static function sampleRateLookup($index) {
|
||
|
|
static $lookup = array(
|
||
|
|
0 => 'invalid',
|
||
|
|
1 => 8000,
|
||
|
|
2 => 16000,
|
||
|
|
3 => 32000,
|
||
|
|
4 => 'invalid',
|
||
|
|
5 => 'invalid',
|
||
|
|
6 => 11025,
|
||
|
|
7 => 22050,
|
||
|
|
8 => 44100,
|
||
|
|
9 => 'invalid',
|
||
|
|
10 => 'invalid',
|
||
|
|
11 => 12000,
|
||
|
|
12 => 24000,
|
||
|
|
13 => 48000,
|
||
|
|
14 => 'invalid',
|
||
|
|
15 => 'invalid',
|
||
|
|
);
|
||
|
|
return (isset($lookup[$index]) ? $lookup[$index] : false);
|
||
|
|
}
|
||
|
|
|
||
|
|
public static function bitPerSampleLookup($index) {
|
||
|
|
static $lookup = array(
|
||
|
|
0 => 16,
|
||
|
|
1 => 20,
|
||
|
|
2 => 24,
|
||
|
|
3 => 24,
|
||
|
|
);
|
||
|
|
return (isset($lookup[$index]) ? $lookup[$index] : false);
|
||
|
|
}
|
||
|
|
|
||
|
|
public static function numChannelsLookup($index) {
|
||
|
|
switch ($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;
|
||
|
|
}
|
||
|
|
|
||
|
|
public static function channelArrangementLookup($index) {
|
||
|
|
static $lookup = array(
|
||
|
|
0 => 'A',
|
||
|
|
1 => 'A + B (dual mono)',
|
||
|
|
2 => 'L + R (stereo)',
|
||
|
|
3 => '(L+R) + (L-R) (sum-difference)',
|
||
|
|
4 => 'LT + RT (left and right total)',
|
||
|
|
5 => 'C + L + R',
|
||
|
|
6 => 'L + R + S',
|
||
|
|
7 => 'C + L + R + S',
|
||
|
|
8 => 'L + R + SL + SR',
|
||
|
|
9 => 'C + L + R + SL + SR',
|
||
|
|
10 => 'CL + CR + L + R + SL + SR',
|
||
|
|
11 => 'C + L + R+ LR + RR + OV',
|
||
|
|
12 => 'CF + CR + LF + RF + LR + RR',
|
||
|
|
13 => 'CL + C + CR + L + R + SL + SR',
|
||
|
|
14 => 'CL + CR + L + R + SL1 + SL2 + SR1 + SR2',
|
||
|
|
15 => 'CL + C+ CR + L + R + SL + S + SR',
|
||
|
|
);
|
||
|
|
return (isset($lookup[$index]) ? $lookup[$index] : 'user-defined');
|
||
|
|
}
|
||
|
|
|
||
|
|
public static function dialogNormalization($index, $version) {
|
||
|
|
switch ($version) {
|
||
|
|
case 7:
|
||
|
|
return 0 - $index;
|
||
|
|
break;
|
||
|
|
case 6:
|
||
|
|
return 0 - 16 - $index;
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
return false;
|
||
|
|
}
|
||
|
|
|
||
|
|
}
|