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diff --git a/services/camera/libcameraservice/device3/Camera3DummyStream.h b/services/camera/libcameraservice/device3/Camera3DummyStream.h
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+++ b/services/camera/libcameraservice/device3/Camera3DummyStream.h
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+/*
+ * Copyright (C) 2014 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_SERVERS_CAMERA3_DUMMY_STREAM_H
+#define ANDROID_SERVERS_CAMERA3_DUMMY_STREAM_H
+
+#include <utils/RefBase.h>
+#include <gui/Surface.h>
+
+#include "Camera3Stream.h"
+#include "Camera3IOStreamBase.h"
+#include "Camera3OutputStreamInterface.h"
+
+namespace android {
+namespace camera3 {
+
+/**
+ * A dummy output stream class, to be used as a placeholder when no valid
+ * streams are configured by the client.
+ * This is necessary because camera HAL v3.2 or older disallow configuring
+ * 0 output streams, while the public camera2 API allows for it.
+ */
+class Camera3DummyStream :
+        public Camera3IOStreamBase,
+        public Camera3OutputStreamInterface {
+
+  public:
+    /**
+     * Set up a dummy stream; doesn't actually connect to anything, and uses
+     * a default dummy format and size.
+     */
+    Camera3DummyStream(int id);
+
+    virtual ~Camera3DummyStream();
+
+    /**
+     * Camera3Stream interface
+     */
+
+    virtual void     dump(int fd, const Vector<String16> &args) const;
+
+    status_t         setTransform(int transform);
+
+  protected:
+
+    /**
+     * Note that we release the lock briefly in this function
+     */
+    virtual status_t returnBufferCheckedLocked(
+            const camera3_stream_buffer &buffer,
+            nsecs_t timestamp,
+            bool output,
+            /*out*/
+            sp<Fence> *releaseFenceOut);
+
+    virtual status_t disconnectLocked();
+
+  private:
+
+    // Default dummy parameters; 320x240 is a required size for all devices,
+    // otherwise act like a SurfaceView would.
+    static const int DUMMY_WIDTH = 320;
+    static const int DUMMY_HEIGHT = 240;
+    static const int DUMMY_FORMAT = HAL_PIXEL_FORMAT_IMPLEMENTATION_DEFINED;
+    static const uint32_t DUMMY_USAGE = GRALLOC_USAGE_HW_COMPOSER;
+
+    /**
+     * Internal Camera3Stream interface
+     */
+    virtual status_t getBufferLocked(camera3_stream_buffer *buffer);
+    virtual status_t returnBufferLocked(
+            const camera3_stream_buffer &buffer,
+            nsecs_t timestamp);
+
+    virtual status_t configureQueueLocked();
+
+    virtual status_t getEndpointUsage(uint32_t *usage);
+
+}; // class Camera3DummyStream
+
+} // namespace camera3
+
+} // namespace android
+
+#endif