dropped-frame tracke

cmd/mxl-player/main.go

@@ -467,7 +467,7 @@ func main() {
 		displayedVideoStride uint32 = placeholderStride
 
 		fps          float64
-		lastIndex    uint64
+		dropTracker  videoDropTracker
 		dropped      uint64
 		droppedTotal uint64
 		frameCount   uint64
@@ -530,6 +530,8 @@ func main() {
 			resized = false
 		}
 		var shownIndex uint64
+		var shownGeneration uint64
+		var shownSource playback.FeedConfig
 		hasFrame := false
 
 		frameCtx, frameCancel := context.WithTimeout(ctx, 100*time.Millisecond)
@@ -555,6 +557,8 @@ func main() {
 			}
 
 			shownIndex = pendingFrame.Frame.Index
+			shownGeneration = pendingFrame.Generation
+			shownSource = pendingFrame.Source
 			displayedVideoWidth = pendingFrame.Frame.Width
 			displayedVideoHeight = pendingFrame.Frame.Height
 			displayedVideoStride = pendingFrame.Frame.Stride
@@ -565,15 +569,14 @@ func main() {
 			panic(frameErr)
 		}
 
+		snapshot, hasSnapshot := player.Controller.Snapshot()
+
 		// stats
 		if hasFrame {
-			if lastIndex != 0 && shownIndex > lastIndex {
-				if g := shownIndex - lastIndex - 1; g > 0 {
-					dropped += g
-					droppedTotal += g
-				}
+			if gap := dropTracker.Observe(shownGeneration, shownSource, shownIndex); gap > 0 {
+				dropped += gap
+				droppedTotal += gap
 			}
-			lastIndex = shownIndex
 			frameCount++
 			if now := time.Now(); now.Sub(lastReport) >= time.Second {
 				dt := now.Sub(lastReport).Seconds()
@@ -588,7 +591,6 @@ func main() {
 		// end of stats
 		if r != nil {
 			gui.BeginFrame(time.Since(lastFrame), int32(r.Extent().Width), int32(r.Extent().Height))
-			snapshot, hasSnapshot := player.Controller.Snapshot()
 			if showStats {
 				cimgui.SetNextWindowPos(cimgui.Vec2{X: 0, Y: 0})
 				cimgui.SetNextWindowSize(cimgui.Vec2{X: 460, Y: 510})