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