Drain accepted MediaCodec inputs before bitrate fallback replacement

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

@@ -24,6 +24,7 @@ internal class CallVideoCodec(requested: CallVideoFormat, bitrate: Int, val name
     private var partialFlags = 0
     private var preparing = false
     private var lastOutput = -1L
+    private var lastInput = -1L
     var pendingFrames = 0
         private set
 
@@ -72,7 +73,7 @@ internal class CallVideoCodec(requested: CallVideoFormat, bitrate: Int, val name
             }
         }
         input.close(); codec.queueInputBuffer(index, 0, format.width * format.height * 3 / 2, pts, 0)
-        pendingFrames++; return true
+        lastInput = pts; pendingFrames++; return true
     }
 
     /** Вызывается перед очередным IDR; подтверждение ядру — только после проверки этого IDR. */
@@ -132,6 +133,23 @@ internal class CallVideoCodec(requested: CallVideoFormat, bitrate: Int, val name
         }
         return packets
     }
+    /** Забрать все принятые входы перед заменой: EOS не требует новых кадров камеры. */
+    fun finish(): List<Packet> {
+        val packets = mutableListOf<Packet>(); val started = System.nanoTime(); var eos = false
+        while (pendingFrames > 0 && System.nanoTime() - started < 2_000_000_000) {
+            if (!eos) {
+                val input = codec.dequeueInputBuffer(0)
+                if (input >= 0) {
+                    codec.queueInputBuffer(input, 0, 0, lastInput + 1, MediaCodec.BUFFER_FLAG_END_OF_STREAM); eos = true
+                }
+            }
+            packets += drain()
+            if (pendingFrames > 0) Thread.sleep(1)
+        }
+        check(pendingFrames == 0) { "Encoder drain timeout name=$name pending=$pendingFrames" }
+        LogManager.addLog("DEBUG", "call", "video encoder drained name=$name frames=${packets.size} us=${(System.nanoTime() - started) / 1000}")
+        return packets
+    }
     override fun close() {
         try { codec.stop() } catch (e: Exception) { LogManager.addLog("WARN", "call", "encoder stop: ${e.message}") }
         codec.release()

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

@@ -133,7 +133,7 @@ class CallVideoEngine(private val context: Context, private val id: Long) {
     private fun fail(message: String) {
         LogManager.addLog("ERROR", "call", "video call=$id $message")
         wanted = wanted.copy(enabled = false); mutable.value = mutable.value.copy(settings = wanted, status = message)
-        closeCamera(); encoder?.close(); encoder = null; active = null
+        closeCamera(); encoder?.close(); encoder = null; pendingFrames.clear(); active = null
         if (confirmingRequest != 0L) CallVideoNative.applied(id, format?.generation ?: 0, confirmingRequest, 0)
         confirmingRequest = 0
     }
@@ -249,6 +249,7 @@ class CallVideoEngine(private val context: Context, private val id: Long) {
                         // References сохранены: уже закодированные P-кадры остаются пригодны до нового KEY.
                         confirmingRequest = requestId
                     } else {
+                        drain(finish = true)
                         old.close(); encoder = null
                         try {
                             encoder = CallVideoCodec(f, pendingRate, name)
@@ -345,9 +346,9 @@ class CallVideoEngine(private val context: Context, private val id: Long) {
             }, handler)
         } catch (e: Exception) { complete(); rejected("Camera session: ${e.message}") }
     }
-    private fun drain() {
+    private fun drain(finish: Boolean = false) {
         val codec = encoder ?: return; val f = format ?: return
-        for (p in codec.drain()) {
+        for (p in if (finish) codec.finish() else codec.drain()) {
             encodedBytes += p.bytes.size; encodedFrames++
             if (confirmingRequest != 0L && p.key && p.pts >= confirmingPts) {
                 CallVideoNative.applied(id, f.generation, confirmingRequest, codec.bitrate); confirmingRequest = 0
@@ -385,7 +386,7 @@ class CallVideoEngine(private val context: Context, private val id: Long) {
         if (stopped) return
         stopped = true; player.stop(); CallVideoNative.close(id)
         handler.post {
-            closeCamera(); encoder?.close(); encoder = null
+            closeCamera(); encoder?.close(); encoder = null; pendingFrames.clear()
             preview.close(); previewTarget?.release(); previewTarget = null
             if (camera == null && !opening) thread.quitSafely()
             else handler.postDelayed({ thread.quitSafely() }, 3000)