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diff --git a/LoopbackApp/app/src/main/cpp/lb2/sound_system_aaudio.h b/LoopbackApp/app/src/main/cpp/lb2/sound_system_aaudio.h
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+/*
+ * Copyright (C) 2017 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 LB2_SOUND_SYSTEM_AAUDIO_H_
+#define LB2_SOUND_SYSTEM_AAUDIO_H_
+
+#include <memory>
+
+#include "lb2/sound_system.h"
+#include "lb2/test_context.h"
+
+// Implementation of a sound system via AAudio API.
+class SoundSystemAAudio : public SoundSystem {
+  public:
+    // Default constructor--for probing.
+    SoundSystemAAudio();
+    // Constructor with a test context--for testing.
+    explicit SoundSystemAAudio(const TestContext *testCtx);
+    SoundSystemAAudio(const SoundSystemAAudio&) = delete;
+    SoundSystemAAudio& operator=(const SoundSystemAAudio&) = delete;
+    virtual ~SoundSystemAAudio();
+
+    bool probeDefaultSettings(PerformanceMode performanceMode, int *samplingRate,
+            int *playerBufferFrameCount, int *recorderBufferFrameCount) override;
+    bool init(WriteCallback callback) override;
+    bool drainInput() override;
+    ssize_t readAudio(AudioBufferView<sample_t> buffer) override;
+    void shutdown() override;
+
+  private:
+    struct Impl;  // AAudio-specific details.
+
+    const TestContext* mTestCtx;
+    const std::unique_ptr<Impl> mImpl;
+};
+
+#endif  // LB2_SOUND_SYSTEM_AAUDIO_H_