Log call video surface lifetime and preview visibility

tools/chatgui-android/app/src/main/java/com/utun/chat/data/CallVideoEngine.kt

@@ -217,7 +217,12 @@ class CallVideoEngine(private val context: Context, private val id: Long) {
                 lastCaptureAt = now
                 if (previewFrames.subscriptionCount.value > 0 && now - previewAt >= 200_000_000) {
                     previewAt = now
-                    try { previewFrames.value = cameraPreview(image, f.rotation, mirror) }
+                    try {
+                        val preview = cameraPreview(image, f.rotation, mirror)
+                        if (previewFrames.value == null) LogManager.addLog("INFO", "call",
+                            "camera preview visible id=$id size=${preview.width}x${preview.height} rotation=${f.rotation} mirror=$mirror")
+                        previewFrames.value = preview
+                    }
                     catch (e: Exception) { LogManager.addLog("WARN", "call", "camera preview failed: ${e.message}") }
                 }
                 val offset = if (realtime) now - SystemClock.elapsedRealtimeNanos() else sensorOffset ?: (now - image.timestamp).also {

tools/chatgui-android/app/src/main/java/com/utun/chat/data/CallVideoPlayer.kt

@@ -45,6 +45,7 @@ internal class CallVideoPlayer(private val id: Long, private val failure: (Strin
                         if (next.detach != null && output?.surface !== next.detach) continue
                         close(); output?.release?.invoke(); output = next; surface = next.surface
                         pending = null; displayed.value = null; CallVideoNative.requestKey(id)
+                        LogManager.addLog("INFO", "call", "video output attached=${surface != null} call=$id")
                     }
                     val valid = NativeLib.callAudioClock(id, now / 1000, clock) && clock[5] != 0L
                     if (valid && sourceEpoch != clock[1]) {
@@ -55,7 +56,10 @@ internal class CallVideoPlayer(private val id: Long, private val failure: (Strin
                     if (held >= 0 && valid && heldPts <= clock[4]) {
                         val render = heldPts >= clock[4] - 500_000
                         decoder!!.releaseOutputBuffer(held, render); held = -1
-                        if (render) { displayed.value = format; lastRendered = now }
+                        if (render) {
+                            if (displayed.value != format) LogManager.addLog("INFO", "call", "video visible call=$id format=$format")
+                            displayed.value = format; lastRendered = now
+                        }
                         lastProgress = now
                     }
                     if (decoder != null && held < 0) {