photo/app/Media/QuickTime/Atoms/moov/mvhd.php

56 lines
1.3 KiB
PHP

<?php
namespace App\Media\QuickTime\Atoms\moov;
// Specifies the characteristics of an entire QuickTime movie.
use Carbon\Carbon;
use Illuminate\Support\Arr;
use App\Media\QuickTime\Atoms\SubAtom;
class mvhd extends SubAtom
{
protected const unpack = [
'version'=>['c',1],
'flags'=>['a3',3],
'create'=>['N',4],
'modified'=>['N',4],
'time_scale'=>['N',4],
'duration'=>['N',4],
'prate'=>['a4',4],
'pvolume'=>['a2',2],
'matrix'=>['a36',36],
'prevtime'=>['N',4],
'prevdur'=>['N',4],
'postertime'=>['N',4],
'selecttime'=>['N',4],
'selectdur'=>['N',4],
'curtime'=>['N',4],
'nexttrack'=>['N',4],
];
public function __get($key): mixed
{
switch ($key) {
case 'creation_date':
// We need to convert from MAC time 1904-01-01 to epoch
return Carbon::createFromTimestamp(Arr::get($this->cache(),'create')-2082844800);
case 'duration':
return ($x=$this->time_scale) ? round(Arr::get($this->cache(),'duration')/$x,3) : NULL;
case 'preferred_rate':
return fixed_point_int_to_float(Arr::get($this->cache(),'prate'));
case 'preferred_volume':
return fixed_point_int_to_float(Arr::get($this->cache(),'pvolume'));
case 'time_scale':
return round(Arr::get($this->cache(),$key));
default:
return parent::__get($key);
}
}
}