diff --git a/services/oboeservice/AAudioServiceEndpointShared.h b/services/oboeservice/AAudioServiceEndpointShared.h
new file mode 100644
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+++ b/services/oboeservice/AAudioServiceEndpointShared.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 AAUDIO_SERVICE_ENDPOINT_SHARED_H
+#define AAUDIO_SERVICE_ENDPOINT_SHARED_H
+
+#include <atomic>
+#include <mutex>
+
+#include "AAudioServiceEndpoint.h"
+#include "client/AudioStreamInternal.h"
+#include "client/AudioStreamInternalPlay.h"
+#include "AAudioServiceStreamShared.h"
+#include "AAudioServiceStreamMMAP.h"
+#include "AAudioService.h"
+
+namespace aaudio {
+
+/**
+ * This Service class corresponds to a Client stream that shares an MMAP device through a mixer
+ * or an input distributor.
+ */
+class AAudioServiceEndpointShared : public AAudioServiceEndpoint {
+
+public:
+
+    std::string dump() const override;
+
+    aaudio_result_t open(const aaudio::AAudioStreamRequest &request) override;
+
+    aaudio_result_t close() override;
+
+    aaudio_result_t startStream(android::sp<AAudioServiceStreamBase> stream,
+                                audio_port_handle_t *clientHandle) override;
+
+    aaudio_result_t stopStream(android::sp<AAudioServiceStreamBase> stream,
+                               audio_port_handle_t clientHandle) override;
+
+    aaudio_result_t getFreeRunningPosition(int64_t *positionFrames, int64_t *timeNanos) override;
+
+    aaudio_result_t getTimestamp(int64_t *positionFrames, int64_t *timeNanos) override;
+
+    virtual void            *callbackLoop() = 0;
+
+    AudioStreamInternal *getStreamInternal() const {
+        return mStreamInternal;
+    };
+
+protected:
+
+    aaudio_result_t          startSharingThread_l();
+
+    aaudio_result_t          stopSharingThread();
+
+    // pointer to object statically allocated in subclasses
+    AudioStreamInternal     *mStreamInternal = nullptr;
+
+    std::atomic<bool>        mCallbackEnabled{false};
+
+    std::atomic<int>         mRunningStreamCount{0};
+};
+
+}
+
+#endif //AAUDIO_SERVICE_ENDPOINT_SHARED_H