34 lines
946 B
PHP
34 lines
946 B
PHP
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<?php
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namespace App\Media\QuickTime\Atoms;
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// File type compatibility—identifies the file type and differentiates it from similar file types,
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// such as MPEG-4 files and JPEG-2000 files.
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// The file type atom has an atom type value of 'ftyp' and contains the following fields:
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// Size, Type, Major brand, Minor version, Compatible brands.
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use Illuminate\Support\Arr;
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use App\Media\QuickTime\Atom;
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class ftyp extends Atom
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{
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protected const unpack = [
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'major'=>['a4',1],
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'minor'=>['a4',4],
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'compat'=>['a4',4],
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];
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public function __construct(int $offset,int $size,string $filename,?string $data) {
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if ($size > 12)
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throw new \Exception('FTYP atom larger than 12 bytes, we wont be able to handled that');
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parent::__construct($offset,$size,$filename);
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$this->cache['data'] = unpack($this->unpack(),$data);
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if (Arr::get($this->cache,'data.compat') !== 'qt ')
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throw new \Exception('This is not a QT format file');
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}
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}
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