From 3a59f2e0567cd560d5197638f35bc3b544896a70 Mon Sep 17 00:00:00 2001
From: James Heinrich <info@getid3.org>
Date: Thu, 8 Aug 2024 13:50:21 -0400
Subject: [PATCH] #450 Ogg wrong duration

https://github.com/JamesHeinrich/getID3/issues/450
---
 getid3/getid3.php           | 2 +-
 getid3/module.audio.ogg.php | 6 ++++++
 2 files changed, 7 insertions(+), 1 deletion(-)

diff --git a/getid3/getid3.php b/getid3/getid3.php
index 6a17cb04..94fb322f 100644
--- a/getid3/getid3.php
+++ b/getid3/getid3.php
@@ -387,7 +387,7 @@ class getID3
 	 */
 	protected $startup_warning = '';
 
-	const VERSION           = '1.9.23-202408061058';
+	const VERSION           = '1.9.23-202408081349';
 	const FREAD_BUFFER_SIZE = 32768;
 
 	const ATTACHMENTS_NONE   = false;
diff --git a/getid3/module.audio.ogg.php b/getid3/module.audio.ogg.php
index ebd2b946..06452cbc 100644
--- a/getid3/module.audio.ogg.php
+++ b/getid3/module.audio.ogg.php
@@ -350,6 +350,12 @@ public function Analyze() {
 			$this->fseek(max($info['avdataend'] - $this->getid3->fread_buffer_size(), 0));
 			$LastChunkOfOgg = strrev($this->fread($this->getid3->fread_buffer_size()));
 			if ($LastOggSpostion = strpos($LastChunkOfOgg, 'SggO')) {
+				if (substr($LastChunkOfOgg, 13, 8) === "\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF") {
+					// https://github.com/JamesHeinrich/getID3/issues/450
+					// "Sometimes, Opus encoders (WhatsApp voice registrations and others) add a special last header with a granule duration of 0xFFFFFFFFFFFFFF.
+					// This value indicates "this is the end," but must be ignored; otherwise, it makes calculations wrong."
+					$LastOggSpostion = strpos($LastChunkOfOgg, 'SggO', $LastOggSpostion + 1);
+				}
 				$this->fseek($info['avdataend'] - ($LastOggSpostion + strlen('SggO')));
 				$info['avdataend'] = $this->ftell();
 				$info['ogg']['pageheader']['eos'] = $this->ParseOggPageHeader();