From bdd255a940a786314ebd151cd650b64fde679b3c Mon Sep 17 00:00:00 2001
From: Horst Beham <horst.beham@schmitzer.at>
Date: Thu, 23 Sep 2021 15:24:21 +0200
Subject: [PATCH] Panasonic: fixed byte-order detection for symbol rate and
 satellite orbital position

---
 source/ChanSort.Loader.Panasonic/DbChannel.cs | 42 ++++++++++++-------
 1 file changed, 26 insertions(+), 16 deletions(-)

diff --git a/source/ChanSort.Loader.Panasonic/DbChannel.cs b/source/ChanSort.Loader.Panasonic/DbChannel.cs
index 9f0b329..f1b6c9e 100644
--- a/source/ChanSort.Loader.Panasonic/DbChannel.cs
+++ b/source/ChanSort.Loader.Panasonic/DbChannel.cs
@@ -98,23 +98,33 @@ namespace ChanSort.Loader.Panasonic
         this.FreqInMhz = freq/10;
 // ReSharper restore PossibleLossOfFraction
 
-        if (deliveryLength == 17) // files of this version also include an additional "cicam_identifier" column
+        if (deliveryLength >= 12)
         {
-          // 50 94 14 01 90 99 21 00 22 31 92 01 00 00 00 00 00
-          this.SymbolRate = (delivery[6] >> 4) * 10000 + (delivery[6] & 0x0F) * 1000 +
-                            (delivery[5] >> 4) * 100 + (delivery[5] & 0x0F) * 10;
-          this.SatPosition = ((decimal)((delivery[11] >> 4) * 1000 + (delivery[11] & 0x0F) * 100 + 
-                                        (delivery[10] >> 4) * 10 + (delivery[10] & 0x0F)) / 10).ToString("n1"); // 92 01 => 19.2
-          this.Satellite = this.SatPosition;
-        }
-        else if (deliveryLength == 15)
-        {
-          // 01 14 92 99 00 21 99 90 02 31 01 92 00 00 00
-          this.SymbolRate = (delivery[5] >> 4) * 10000 + (delivery[5] & 0x0F) * 1000 +
-                            (delivery[6] >> 4) * 100 + (delivery[6] & 0x0F) * 10;
-          this.SatPosition = ((decimal)((delivery[10] >> 4) * 1000 + (delivery[10] & 0x0F) * 100 + (delivery[11] >> 4) * 10 +
-                                        (delivery[11] & 0x0F)) / 10).ToString("n1"); // 01 92 => 19.2
-          this.Satellite = this.SatPosition;
+          // byte 5 and 6 contain hex-encoded decimal digits for symbol rate divided by 10. bytes 10 and 11 are the sat orbital position
+          // however there are some files that swap the bytes with no clear indication what format is used by the TV.
+          // we use a heuristic approach whether byte 0 or byte 3 is 0x01
+
+          if (delivery[3] == 0x01)
+          {
+            // 50 94 14 01 90 99 21 00 22 31 92 01 00 00 00 00 00 
+            // 04 54 10 01 10 50 27 00 04 09 30 01 00 00 00
+
+            this.SymbolRate = (delivery[6] >> 4) * 10000 + (delivery[6] & 0x0F) * 1000 +
+                              (delivery[5] >> 4) * 100 + (delivery[5] & 0x0F) * 10;
+            this.SatPosition = ((decimal)((delivery[11] >> 4) * 1000 + (delivery[11] & 0x0F) * 100 + // 99 21 => 21990, 50 27 => 27500
+                                          (delivery[10] >> 4) * 10 + (delivery[10] & 0x0F)) / 10).ToString("n1"); // 92 01 => 19.2
+            this.Satellite = this.SatPosition;
+          }
+          else
+          {
+            // 01 14 92 99 00 21 99 90 02 31 01 92 00 00 00
+
+            this.SymbolRate = (delivery[5] >> 4) * 10000 + (delivery[5] & 0x0F) * 1000 + // 21 99 => 21990
+                              (delivery[6] >> 4) * 100 + (delivery[6] & 0x0F) * 10;
+            this.SatPosition = ((decimal)((delivery[10] >> 4) * 1000 + (delivery[10] & 0x0F) * 100 + (delivery[11] >> 4) * 10 +
+                                          (delivery[11] & 0x0F)) / 10).ToString("n1"); // 01 92 => 19.2
+            this.Satellite = this.SatPosition;
+          }
         }
         else
         {