photo/app/Media/QuickTime/Atoms/moov/trak/tkhd.php

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2024-09-16 12:10:19 +00:00
<?php
namespace App\Media\QuickTime\Atoms\moov\trak;
// An atom that specifies the characteristics of a single track within a movie
use Illuminate\Support\Arr;
use App\Media\QuickTime\Atoms\SubAtom;
class tkhd extends SubAtom
{
protected const unpack = [
'version'=>['c',1],
'flags'=>['a3',3],
'create'=>['N',4],
'modified'=>['N',4],
'trakid'=>['N',4], // The value 0 cannot be used
'reserved1'=>['a4',4],
'duration'=>['N',4],
'reserved2'=>['a8',8],
'layer'=>['n',2],
'altgroup'=>['n',2],
'volume'=>['a2',2], // 16 bit fixed point
'reserved3'=>['a2',2],
'matrix'=>['a36',36],
'twidth'=>['a4',4], // 32 bit fixed point
'theight'=>['a4',4], // 32 bit fixed point
];
public function __construct(int $offset,int $size,string $filename,?string $data)
{
parent::__construct($offset,$size,$filename,$data);
$this->cache = $this->cache();
// For debugging
if (FALSE)
$this->debug = hex_dump($data ?: $this->data());
}
public function __get($key): mixed
{
switch ($key) {
case 'height':
return fixed_point_int_to_float(Arr::get($this->cache(),'theight'));
case 'width':
return fixed_point_int_to_float(Arr::get($this->cache(),'twidth'));
default:
return parent::__get($key);
}
}
}