Analysis.php

<?php

use GetId3\GetId3Core as ID3;
use Symfony\Component\HttpFoundation\File\UploadedFile;

trait Analysis {

	// min, max
	protected $bitrate = 128.0; // kbps

	// max upload size
	protected $maxSize = 17000000; // 17MiB

	// max song length, in seconds
	protected $length = 480.0; // 8 minutes

	// allowed formats
	protected $formats = ["mp3"];


	protected function analyze(UploadedFile $file) {
		$size = $file->getSize();

		$status = ["error" => [], "success" = []];

		$analyzer = new ID3();
		$analyzer->setEncoding("UTF-8");

		$result = $analyzer->analyze($file->getRealPath());

		if ($result["error"]) {
			$status["error"][] = $result["error"];
		} else {

			// song length in seconds (float)
			$length = @$result["playtime_seconds"];

			// exact bitrate, in float format (kbps)
			$bitrate = @$result["audio"]["bitrate"];

			// cbr, vbr, etc
			$mode = @$result["audio"]["bitrate_mode"];

			// sample rate, in Hz (int)
			$sampleRate = @$result["audio"]["sample_rate"];

			// "mp3" or "ogg" etc.
			$format = @$result["fileformat"];

			// UTF-8, etc
			$encoding = @$result["encoding"];


			
			// cover image
			// raw JPEG/PNG/whatever data
			// $coverImage = @$result["comments"]["picture"][0]["data"]; 

			// these are generic, non-tag comments set by ID3 as an implementation-agnostic metadata dump
			$title = @$result["comments"]["title"][1]; // 0 is a truncated version

			$album = @$result["comments"]["album"];
			
			$artist = @$result["comments"]["artist"];

			if (! in_array($format, $this->formats))
				$status["error"][] = "$format is not allowed.";

			if ($bitrate < $this->bitrate[0])
				$status["error"][] = "Bitrate is too low ({$bitrate}kbps)";

			if ($length > $this->length)
				$status["error"][] = "The song is too long (>{$this->length} seconds)";

			if ($size > $this->maxSize)
				$status["error"][] = "Max filesize exceeded (" . $this->maxSize / 1000000 . "MiB)";


			if (! count($status["error"]))
				$status["success"] = [
					"length" => $length,
					"bitrate" => $bitrate,
					"mode" => $mode,
					"format" => $format,
					"mime" => $mime,
					"title" => $title,
					"artist" => $artist,
					"album" => $album,
					"encoding" => $encoding,
				];

		}

		return $status;

	}

	protected function addPending(UploadedFile $file) {
		$status = $this->analyze($file);

		if (count($status["error"])) {
			return $status;
		}

		$new = $status["success"];





	}

}