diff --git a/services/mediatranscoding/SimulatedTranscoder.h b/services/mediatranscoding/SimulatedTranscoder.h
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+++ b/services/mediatranscoding/SimulatedTranscoder.h
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+/*
+ * Copyright (C) 2020 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 ANDROID_MEDIA_SIMULATED_TRANSCODER_H
+#define ANDROID_MEDIA_SIMULATED_TRANSCODER_H
+
+#include <android-base/thread_annotations.h>
+#include <media/TranscoderInterface.h>
+
+#include <list>
+#include <mutex>
+
+namespace android {
+
+/**
+ * SimulatedTranscoder is currently used to instantiate MediaTranscodingService
+ * on service side for testing, so that we could actually test the IPC calls of
+ * MediaTranscodingService to expose issues that's observable only over IPC.
+ *
+ * SimulatedTranscoder simulates job execution by reporting finish after kJobDurationUs.
+ * Job lifecycle events are reported via progress updates with special progress
+ * numbers (equal to the Event's type).
+ */
+class SimulatedTranscoder : public TranscoderInterface {
+public:
+    struct Event {
+        enum Type { NoEvent, Start, Pause, Resume, Finished, Failed } type;
+        int64_t clientId;
+        int32_t jobId;
+    };
+
+    static constexpr int64_t kJobDurationUs = 1000000;
+
+    SimulatedTranscoder();
+
+    // TranscoderInterface
+    void setCallback(const std::shared_ptr<TranscoderCallbackInterface>& cb) override;
+    void start(int64_t clientId, int32_t jobId) override;
+    void pause(int64_t clientId, int32_t jobId) override;
+    void resume(int64_t clientId, int32_t jobId) override;
+    // ~TranscoderInterface
+
+private:
+    std::weak_ptr<TranscoderCallbackInterface> mCallback;
+    std::mutex mLock;
+    std::condition_variable mCondition;
+    std::list<Event> mQueue GUARDED_BY(mLock);
+
+    static const char* toString(Event::Type type);
+    void queueEvent(Event::Type type, int64_t clientId, int32_t jobId);
+    void threadLoop();
+};
+
+}  // namespace android
+
+#endif  // ANDROID_MEDIA_SIMULATED_TRANSCODER_H