Implement our own quicktime parser

app/Media/QuickTime/Atoms/moov/meta/free.php

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+<?php
+
+namespace App\Media\QuickTime\Atoms\moov\meta;
+
+// Unused space available in file.
+
+use App\Media\QuickTime\Atoms\SubAtom;
+
+class free extends SubAtom
+{
+
+}

app/Media/QuickTime/Atoms/moov/meta/ilst.php

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

app/Media/QuickTime/Atoms/moov/meta/keys.php

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+<?php
+
+namespace App\Media\QuickTime\Atoms\moov\meta;
+
+// The metadata item keys atom holds a list of the metadata keys that may be present in the metadata atom.
+// This list is indexed starting with 1; 0 is a reserved index value. The metadata item keys atom is a full atom with an atom type of "keys".
+
+use App\Media\QuickTime\Atoms\SubAtom;
+
+class keys extends SubAtom
+{
+	public function __construct(int $offset,int $size,string $filename,?string $data)
+	{
+		parent::__construct($offset,$size,$filename);
+
+		$this->keys = collect();
+		$read = unpack($this->unpack(self::atom_record),substr($data,0,$ptr=$this->unpack_size(self::atom_record)));
+
+		for ($i=0; $i<$read['count']; $i++) {
+			$key_size = unpack('Nsize',substr($data,$ptr,4));
+			$keys = unpack(sprintf('a4namespace/a%dname',$key_size['size']-8),substr($data,$ptr+4,4+$key_size['size']-8));
+			$ptr += $key_size['size'];
+			$this->cache = $this->cache->push(sprintf('%s.%s',$keys['namespace'],$keys['name']));
+		}
+	}
+}