Keep queued video frames during in-place bitrate changes

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

@@ -232,26 +232,27 @@ class CallVideoEngine(private val context: Context, private val id: Long) {
                 val pts = (image.timestamp + offset) / 1000
                 // Camera2 уже ограничена 30 fps. Порог 33333 мкс отбрасывал каждый второй кадр при дрожании часов.
                 if (pts <= lastPts) return@setOnImageAvailableListener
-                val key = needKey || lastKey < 0 || pts - lastKey >= 1_000_000
+                val key = needKey || confirmingRequest != 0L || lastKey < 0 || pts - lastKey >= 1_000_000
                 if (key && pendingRequest != 0L) {
                     val requestId = pendingRequest; pendingRequest = 0
                     val old = checkNotNull(encoder); val oldRate = old.bitrate; val name = old.name
                     confirmingPts = pts
                     if (old.setBitrate(pendingRate)) {
-                        confirmingRequest = requestId; needKey = true
+                        // References сохранены: уже закодированные P-кадры остаются пригодны до нового KEY.
+                        confirmingRequest = requestId
                     } else {
-                      old.close(); encoder = null
-                      try {
-                        encoder = CallVideoCodec(f, pendingRate, name)
-                        encoder!!.prepare(); check(encoder!!.format == f) { "Bitrate change altered encoder format" }
-                        confirmingRequest = requestId; needKey = true
-                        report("Applying ${pendingRate / 1000} kbit/s on IDR")
-                      } catch (e: Exception) {
-                        LogManager.addLog("WARN", "call", "video bitrate replacement failed: ${e.message}; restoring $oldRate")
-                        encoder?.close(); encoder = CallVideoCodec(f, oldRate, name)
-                        encoder!!.prepare(); check(encoder!!.format == f)
-                        confirmingRequest = requestId; needKey = true
-                      }
+                        old.close(); encoder = null
+                        try {
+                            encoder = CallVideoCodec(f, pendingRate, name)
+                            encoder!!.prepare(); check(encoder!!.format == f) { "Bitrate change altered encoder format" }
+                            confirmingRequest = requestId; needKey = true
+                            report("Applying ${pendingRate / 1000} kbit/s on IDR")
+                        } catch (e: Exception) {
+                            LogManager.addLog("WARN", "call", "video bitrate replacement failed: ${e.message}; restoring $oldRate")
+                            encoder?.close(); encoder = CallVideoCodec(f, oldRate, name)
+                            encoder!!.prepare(); check(encoder!!.format == f)
+                            confirmingRequest = requestId; needKey = true
+                        }
                     }
                 }
                 if (encoder?.submit(image, pts, key) == true) lastPts = pts