From 321f286a6d3471417158a2833aa5ea20e751a207 Mon Sep 17 00:00:00 2001
From: Volker Fischer <corrados@users.noreply.github.com>
Date: Mon, 6 Apr 2020 17:17:49 +0200
Subject: [PATCH] re-introduce PROTMESSID_OPUS_SUPPORTED message to support
 older client versions

---
 src/channel.cpp  |  1 +
 src/protocol.cpp | 12 ++++++++++++
 src/protocol.h   |  3 ++-
 3 files changed, 15 insertions(+), 1 deletion(-)

diff --git a/src/channel.cpp b/src/channel.cpp
index 05ac3550..75829284 100755
--- a/src/channel.cpp
+++ b/src/channel.cpp
@@ -350,6 +350,7 @@ void CChannel::OnNetTranspPropsReceived ( CNetworkTransportProps NetworkTranspor
         if ( ( NetworkTransportProps.eAudioCodingType != CT_OPUS ) &&
              ( NetworkTransportProps.eAudioCodingType != CT_OPUS64 ) )
         {
+            Protocol.CreateOpusSupportedMes();
             return;
         }
 
diff --git a/src/protocol.cpp b/src/protocol.cpp
index 7120274d..de15bb84 100755
--- a/src/protocol.cpp
+++ b/src/protocol.cpp
@@ -154,6 +154,12 @@ MESSAGES (with connection)
     +---------------------+
 
 
+// #### COMPATIBILITY OLD VERSION, TO BE REMOVED ####
+- PROTMESSID_OPUS_SUPPORTED: Informs that OPUS codec is supported
+
+    note: does not have any data -> n = 0
+
+
 CONNECTION LESS MESSAGES
 ------------------------
 
@@ -1222,6 +1228,12 @@ bool CProtocol::EvaluateLicenceRequiredMes ( const CVector<uint8_t>& vecData )
     return false; // no error
 }
 
+void CProtocol::CreateOpusSupportedMes()
+{
+    CreateAndSendMessage ( PROTMESSID_OPUS_SUPPORTED,
+                           CVector<uint8_t> ( 0 ) );
+}
+
 
 // Connection less messages ----------------------------------------------------
 void CProtocol::CreateCLPingMes ( const CHostAddress& InetAddr, const int iMs )
diff --git a/src/protocol.h b/src/protocol.h
index 59ed83ac..617092c0 100755
--- a/src/protocol.h
+++ b/src/protocol.h
@@ -52,7 +52,7 @@
 #define PROTMESSID_REQ_CHANNEL_INFOS          23 // request channel infos for fader tag
 #define PROTMESSID_CONN_CLIENTS_LIST          24 // channel infos for connected clients
 #define PROTMESSID_CHANNEL_INFOS              25 // set channel infos
-#define PROTMESSID_OPUS_SUPPORTED             26 // OLD (not used anymore)
+#define PROTMESSID_OPUS_SUPPORTED             26 // tells that OPUS codec is supported
 #define PROTMESSID_LICENCE_REQUIRED           27 // licence required
 
 // message IDs of connection less messages (CLM)
@@ -101,6 +101,7 @@ public:
     void CreateNetwTranspPropsMes ( const CNetworkTransportProps& NetTrProps );
     void CreateReqNetwTranspPropsMes();
     void CreateLicenceRequiredMes ( const ELicenceType eLicenceType );
+    void CreateOpusSupportedMes();
 
     void CreateCLPingMes               ( const CHostAddress& InetAddr, const int iMs );
     void CreateCLPingWithNumClientsMes ( const CHostAddress& InetAddr,