Add synthetic v210 feed source

AppConfig.cpp

@@ -686,6 +686,13 @@ std::optional<FeedKind> parseFeedKind(std::string_view text)
         return FeedKind::SmpteBars;
     }
 
+    if (text == "v210" ||
+        text == "synthetic-v210" ||
+        text == "v210test")
+    {
+        return FeedKind::SyntheticV210;
+    }
+
     if (text == "mxlsdk")
     {
         return FeedKind::MxlSdk;
@@ -724,6 +731,9 @@ std::string_view feedKindName(FeedKind kind)
         case FeedKind::SmpteBars:
             return "smpte";
 
+        case FeedKind::SyntheticV210:
+            return "v210";
+
         case FeedKind::MxlSdk:
             return "mxlsdk";
 
@@ -754,7 +764,7 @@ void printUsage(const char* executableName)
         << "  --flow <idx> <uuid>   Set MXL flow UUID for feed slot\n"
         << "  --version             Print version\n"
         << "  --help                Print this help\n"
-        << "Feed kinds: nosignal, none, fake, mxl, smpte, mxlsdk\n"
+        << "Feed kinds: nosignal, none, fake, mxl, smpte, v210, mxlsdk\n"
         << "Default: 2x2 grid, all slots nosignal"
         << std::endl;
 }