Implement our own quicktime parser

app/Media/QuickTime/Atoms/moov/mvhd.php

@@ -0,0 +1,56 @@
+<?php
+
+namespace App\Media\QuickTime\Atoms\moov;
+
+// Specifies the characteristics of an entire QuickTime movie.
+
+use Carbon\Carbon;
+use Illuminate\Support\Arr;
+
+use App\Media\QuickTime\Atoms\SubAtom;
+
+class mvhd extends SubAtom
+{
+	protected const unpack = [
+		'version'=>['c',1],
+		'flags'=>['a3',3],
+		'create'=>['N',4],
+		'modified'=>['N',4],
+		'time_scale'=>['N',4],
+		'duration'=>['N',4],
+		'prate'=>['a4',4],
+		'pvolume'=>['a2',2],
+		'matrix'=>['a36',36],
+		'prevtime'=>['N',4],
+		'prevdur'=>['N',4],
+		'postertime'=>['N',4],
+		'selecttime'=>['N',4],
+		'selectdur'=>['N',4],
+		'curtime'=>['N',4],
+		'nexttrack'=>['N',4],
+	];
+
+	public function __get($key): mixed
+	{
+		switch ($key) {
+			case 'creation_date':
+				// We need to convert from MAC time 1904-01-01 to epoch
+				return Carbon::createFromTimestamp(Arr::get($this->cache(),'create')-2082844800);
+
+			case 'duration':
+				return ($x=$this->time_scale) ? round(Arr::get($this->cache(),'duration')/$x,3) : NULL;
+
+			case 'preferred_rate':
+				return fixed_point_int_to_float(Arr::get($this->cache(),'prate'));
+
+			case 'preferred_volume':
+				return fixed_point_int_to_float(Arr::get($this->cache(),'pvolume'));
+
+			case 'time_scale':
+				return round(Arr::get($this->cache(),$key));
+
+			default:
+				return parent::__get($key);
+		}
+	}
+}