From a97535e17ce6200322ed6e6f036675f0fc4096c7 Mon Sep 17 00:00:00 2001
From: feyris-tan <4116042+feyris-tan@users.noreply.github.com>
Date: Sat, 14 Mar 2026 22:44:43 +0100
Subject: [PATCH] Added a method to detect on whether a ProgramMappingStream is
 an RCS2 stream.

---
 .../Mpeg2/Psi/Model/ProgramMappingStream.cs   | 44 +++++++++++++++++++
 1 file changed, 44 insertions(+)

diff --git a/skyscraper8/Mpeg2/Psi/Model/ProgramMappingStream.cs b/skyscraper8/Mpeg2/Psi/Model/ProgramMappingStream.cs
index fcac3c8..465840b 100644
--- a/skyscraper8/Mpeg2/Psi/Model/ProgramMappingStream.cs
+++ b/skyscraper8/Mpeg2/Psi/Model/ProgramMappingStream.cs
@@ -236,5 +236,49 @@ namespace skyscraper5.Mpeg2.Psi.Model
             return ((byte)StreamType) >= 0x80;
         }
 
+        public bool LooksLikeRcs2Stream()
+        {
+			if (NumDescriptors != 1)
+				return false;
+			if (UnknownUserDefines == null)
+				return false;
+			if (UnknownUserDefines.Count != 1)
+				return false;
+
+			UserDefinedDescriptor descriptorCandidate = UnknownUserDefines[0];
+			if (descriptorCandidate.DescriptorTag != 0xa7)
+				return false;
+
+			foreach(byte b in descriptorCandidate.Data)
+			{
+				switch(b)
+				{
+					case 0x40:
+					case 0x41:
+					case 0x4d:
+					case 0x70:
+					case 0xa0:
+					case 0xa1:
+					case 0xa2:
+					case 0xa3:
+					case 0xa4:
+					case 0xa5:
+					case 0xa6:
+					case 0xaa:
+                    case 0xab:
+                    case 0xac:
+                    case 0xad:
+                    case 0xae:
+                    case 0xaf:
+                    case 0xb0:
+                    case 0xb1:
+                    case 0xb2:
+						continue;
+                    default:
+                        return false;
+				}
+			}
+            return true;
+        }
     }
 }