From ca48193cd6b7ad43f16486d9cd928648fea39015 Mon Sep 17 00:00:00 2001
From: David Craven <david@craven.ch>
Date: Sun, 9 Jul 2023 17:44:03 +0200
Subject: [PATCH] matroska: demux: Strip signal byte from encrypted blocks

Removes the signal byte when the frame is unencrypted to
be consistent with when the frame is encrypted.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/5014>
---
 .../gst-plugins-good/gst/matroska/matroska-read-common.c        | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/subprojects/gst-plugins-good/gst/matroska/matroska-read-common.c b/subprojects/gst-plugins-good/gst/matroska/matroska-read-common.c
index 0e9d0b6b14..0149b174c9 100644
--- a/subprojects/gst-plugins-good/gst/matroska/matroska-read-common.c
+++ b/subprojects/gst-plugins-good/gst/matroska/matroska-read-common.c
@@ -448,6 +448,8 @@ gst_matroska_parse_protection_meta (gpointer * data_out, gsize * size_out,
 
   /* Unencrypted buffer */
   if (!(signal_byte & GST_MATROSKA_BLOCK_ENCRYPTED)) {
+    *size_out = gst_byte_reader_get_remaining (&reader);
+    gst_byte_reader_get_data (&reader, *size_out, (const guint8 **) data_out);
     return TRUE;
   }