Add a special error code for early termination

src/ControlStream.c

@@ -570,8 +570,15 @@ static void controlReceiveThreadFunc(void* context) {
 
                 // SERVER_TERMINATED_INTENDED
                 if (terminationReason == 0x0100) {
-                    // Pass error code 0 to notify the client that this was not an error
-                    terminationErrorCode = ML_ERROR_GRACEFUL_TERMINATION;
+                    if (lastSeenFrame != 0) {
+                        // Pass error code 0 to notify the client that this was not an error
+                        terminationErrorCode = ML_ERROR_GRACEFUL_TERMINATION;
+                    }
+                    else {
+                        // We never saw a frame, so this is probably an error that caused
+                        // NvStreamer to terminate prior to sending any frames.
+                        terminationErrorCode = ML_ERROR_UNEXPECTED_EARLY_TERMINATION;
+                    }
                 }
                 else {
                     // Otherwise pass the reason unmodified

src/Limelight.h

@@ -369,6 +369,12 @@ typedef void(*ConnListenerConnectionTerminated)(int errorCode);
 // an extremely unstable connection or a bitrate that is far too high.
 #define ML_ERROR_NO_VIDEO_FRAME -101
 
+// This error is passed to ConnListenerConnectionTerminated() if the stream ends
+// very soon after starting due to a graceful termination from the host. Usually
+// this seems to happen if DRM protected content is on-screen, or another issue
+// that prevents the encoder from being able to capture video successfully.
+#define ML_ERROR_UNEXPECTED_EARLY_TERMINATION -102
+
 // This callback is invoked to log debug message
 typedef void(*ConnListenerLogMessage)(const char* format, ...);