Implement host processing time in stats overlay

Limelight/Stream/Connection.h

@@ -17,6 +17,10 @@ typedef struct {
     int totalFrames;
     int receivedFrames;
     int networkDroppedFrames;
+    int totalHostProcessingLatency;
+    int framesWithHostProcessingLatency;
+    int maxHostProcessingLatency;
+    int minHostProcessingLatency;
 } video_stats_t;
 
 @interface Connection : NSOperation <NSStreamDelegate>

Limelight/Stream/Connection.m

@@ -143,6 +143,19 @@ int DrSubmitDecodeUnit(PDECODE_UNIT decodeUnit)
         lastFrameNumber = decodeUnit->frameNumber;
     }
     
+    if (decodeUnit->frameHostProcessingLatency != 0) {
+        if (currentVideoStats.minHostProcessingLatency == 0 || decodeUnit->frameHostProcessingLatency < currentVideoStats.minHostProcessingLatency) {
+            currentVideoStats.minHostProcessingLatency = decodeUnit->frameHostProcessingLatency;
+        }
+        
+        if (decodeUnit->frameHostProcessingLatency > currentVideoStats.maxHostProcessingLatency) {
+            currentVideoStats.maxHostProcessingLatency = decodeUnit->frameHostProcessingLatency;
+        }
+        
+        currentVideoStats.framesWithHostProcessingLatency++;
+        currentVideoStats.totalHostProcessingLatency += decodeUnit->frameHostProcessingLatency;
+    }
+    
     currentVideoStats.receivedFrames++;
     currentVideoStats.totalFrames++;
 

Limelight/Stream/StreamManager.m

@@ -167,14 +167,26 @@
         latencyString = @"N/A";
     }
     
+    NSString* hostProcessingString;
+    if (stats.framesWithHostProcessingLatency != 0) {
+        hostProcessingString = [NSString stringWithFormat:@"\nHost processing latency min/max/avg: %.1f/%.1f/%.1f ms",
+                                stats.minHostProcessingLatency / 10.f,
+                                stats.maxHostProcessingLatency / 10.f,
+                                (float)stats.totalHostProcessingLatency / stats.framesWithHostProcessingLatency / 10.f];
+    }
+    else {
+        hostProcessingString = @"";
+    }
+    
     float interval = stats.endTime - stats.startTime;
-    return [NSString stringWithFormat:@"Video stream: %dx%d %.2f FPS (Codec: %@)\nFrames dropped by your network connection: %.2f%%\nAverage network latency: %@",
+    return [NSString stringWithFormat:@"Video stream: %dx%d %.2f FPS (Codec: %@)\nFrames dropped by your network connection: %.2f%%\nAverage network latency: %@%@",
             _config.width,
             _config.height,
             stats.totalFrames / interval,
             [_connection getActiveCodecName],
             stats.networkDroppedFrames / interval,
-            latencyString];
+            latencyString,
+            hostProcessingString];
 }
 
 @end