41 lines
1.1 KiB
PHP
41 lines
1.1 KiB
PHP
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<?php
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namespace App\Media\QuickTime\Atoms\moov\meta;
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// Item LiST container atom
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use App\Media\QuickTime\Atoms\SubAtom;
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class ilst extends SubAtom
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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);
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$ptr = 0;
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while ($ptr < strlen($data)) {
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$key_size = unpack('Nsize',substr($data,$ptr,4));
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// Sometimes atoms are terminated with a 0
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if ($key_size['size'] === 0) {
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$ptr += 4;
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continue;
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}
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$a = unpack(sprintf('a4name/a%ddata',$key_size['size']-8),substr($data,$ptr+4,4+$key_size['size']-8));
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$ptr += $key_size['size'];
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// If we didnt get the right amount of data, something is wrong.
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if (strlen($a['data']) < $key_size['size']-8)
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break;
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$b = unpack(sprintf('Nsize/a4name/a%ddata',strlen($a['data'])-8),$a['data']);
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if ($b['name'] !== 'data')
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throw new \Exception('Parsing of ILST got data that wasnt expected');
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$c = unpack(sprintf('a4language/a4unknown/a%ddata',strlen($b['data'])-8),$b['data']);
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// heirachy, name, size, offset
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$this->cache = $this->cache->push($c['data']);
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}
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}
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}
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