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