Implement performance overlay.

app/src/main/java/com/limelight/binding/video/VideoStats.java

@@ -0,0 +1,70 @@
+package com.limelight.binding.video;
+
+class VideoStats {
+
+    long decoderTimeMs;
+    long totalTimeMs;
+    int totalFrames;
+    int totalFramesReceived;
+    int totalFramesRendered;
+    int frameLossEvents;
+    int framesLost;
+    long measurementStartTimestamp;
+
+    void add(VideoStats other) {
+        this.decoderTimeMs += other.decoderTimeMs;
+        this.totalTimeMs += other.totalTimeMs;
+        this.totalFrames += other.totalFrames;
+        this.totalFramesReceived += other.totalFramesReceived;
+        this.totalFramesRendered += other.totalFramesRendered;
+        this.frameLossEvents += other.frameLossEvents;
+        this.framesLost += other.framesLost;
+
+        if (this.measurementStartTimestamp == 0) {
+            this.measurementStartTimestamp = other.measurementStartTimestamp;
+        }
+
+        assert other.measurementStartTimestamp <= this.measurementStartTimestamp;
+    }
+
+    void copy(VideoStats other) {
+        this.decoderTimeMs = other.decoderTimeMs;
+        this.totalTimeMs = other.totalTimeMs;
+        this.totalFrames = other.totalFrames;
+        this.totalFramesReceived = other.totalFramesReceived;
+        this.totalFramesRendered = other.totalFramesRendered;
+        this.frameLossEvents = other.frameLossEvents;
+        this.framesLost = other.framesLost;
+        this.measurementStartTimestamp = other.measurementStartTimestamp;
+    }
+
+    void clear() {
+        this.decoderTimeMs = 0;
+        this.totalTimeMs = 0;
+        this.totalFrames = 0;
+        this.totalFramesReceived = 0;
+        this.totalFramesRendered = 0;
+        this.frameLossEvents = 0;
+        this.framesLost = 0;
+        this.measurementStartTimestamp = 0;
+    }
+
+    VideoStatsFps getFps() {
+        float elapsed = (System.currentTimeMillis() - this.measurementStartTimestamp) / (float) 1000;
+
+        VideoStatsFps fps = new VideoStatsFps();
+        if (elapsed > 0) {
+            fps.totalFps = this.totalFrames / elapsed;
+            fps.receivedFps = this.totalFramesReceived / elapsed;
+            fps.renderedFps = this.totalFramesRendered / elapsed;
+        }
+        return fps;
+    }
+}
+
+class VideoStatsFps {
+
+    float totalFps;
+    float receivedFps;
+    float renderedFps;
+}