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diff --git a/apps/OboeTester/app/src/main/cpp/TestRoutingCrash.h b/apps/OboeTester/app/src/main/cpp/TestRoutingCrash.h
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+/*
+ * Copyright 2023 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_TEST_ROUTING_CRASH_H
+#define OBOETESTER_TEST_ROUTING_CRASH_H
+
+#include "oboe/Oboe.h"
+#include <thread>
+
+/**
+ * Try to cause a crash by changing routing during a data callback.
+ * We use Use::VoiceCommunication for the stream and
+ * setSpeakerPhoneOn(b) to force a routing change.
+ * This works best when connected to a BT headset.
+ */
+class TestRoutingCrash {
+public:
+
+    int32_t start(bool useInput);
+    int32_t stop();
+
+    int32_t getSleepTimeMicros() {
+        return (int32_t) (averageSleepTimeMicros.load());
+    }
+
+protected:
+
+    std::atomic<double> averageSleepTimeMicros{0};
+
+private:
+
+    class MyDataCallback : public oboe::AudioStreamDataCallback {    public:
+
+        MyDataCallback(TestRoutingCrash *parent): mParent(parent) {}
+
+        oboe::DataCallbackResult onAudioReady(
+                oboe::AudioStream *audioStream,
+                void *audioData,
+                int32_t numFrames) override;
+    private:
+        TestRoutingCrash *mParent;
+        // For sine generator.
+        float mPhase = 0.0f;
+        static constexpr float kPhaseIncrement = 2.0f * (float) M_PI * 440.0f / 48000.0f;
+        float mInputSum = 0.0f; // For saving input data sum to prevent over-optimization.
+    };
+
+    std::shared_ptr<oboe::AudioStream> mStream;
+    std::shared_ptr<MyDataCallback> mDataCallback;
+
+    static constexpr int kChannelCount = 1;
+};
+
+#endif //OBOETESTER_TEST_ROUTING_CRASH_H