diff --git a/apps/OboeTester/app/src/main/cpp/FullDuplexAnalyzer.h b/apps/OboeTester/app/src/main/cpp/FullDuplexAnalyzer.h
new file mode 100644
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+++ b/apps/OboeTester/app/src/main/cpp/FullDuplexAnalyzer.h
@@ -0,0 +1,54 @@
+/*
+ * Copyright 2019 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef OBOETESTER_FULL_DUPLEX_ANALYZER_H
+#define OBOETESTER_FULL_DUPLEX_ANALYZER_H
+
+#include <unistd.h>
+#include <sys/types.h>
+
+#include "oboe/Oboe.h"
+#include "FullDuplexStream.h"
+#include "LatencyAnalyzer.h"
+
+class FullDuplexAnalyzer : public FullDuplexStream {
+public:
+    FullDuplexAnalyzer() {}
+
+    /**
+     * Called when data is available on both streams.
+     * Caller should override this method.
+     */
+    oboe::DataCallbackResult onBothStreamsReady(
+            const void *inputData,
+            int   numInputFrames,
+            void *outputData,
+            int   numOutputFrames
+    ) override;
+
+    oboe::Result start() override;
+
+    bool isDone() {
+        return false;
+    }
+
+    virtual LoopbackProcessor *getLoopbackProcessor() = 0;
+
+};
+
+
+#endif //OBOETESTER_FULL_DUPLEX_ANALYZER_H
+