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diff --git a/services/camera/libcameraservice/device3/Camera3StreamInterface.h b/services/camera/libcameraservice/device3/Camera3StreamInterface.h
new file mode 100644
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+++ b/services/camera/libcameraservice/device3/Camera3StreamInterface.h
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+/*
+ * Copyright (C) 2013 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_STREAM_INTERFACE_H
+#define ANDROID_SERVERS_CAMERA3_STREAM_INTERFACE_H
+
+#include <utils/RefBase.h>
+#include "Camera3StreamBufferListener.h"
+
+struct camera3_stream_buffer;
+
+namespace android {
+
+namespace camera3 {
+
+class StatusTracker;
+
+/**
+ * An interface for managing a single stream of input and/or output data from
+ * the camera device.
+ */
+class Camera3StreamInterface : public virtual RefBase {
+  public:
+    /**
+     * Get the stream's ID
+     */
+    virtual int      getId() const = 0;
+
+    /**
+     * Get the stream's dimensions and format
+     */
+    virtual uint32_t getWidth() const = 0;
+    virtual uint32_t getHeight() const = 0;
+    virtual int      getFormat() const = 0;
+
+    /**
+     * Start the stream configuration process. Returns a handle to the stream's
+     * information to be passed into the HAL device's configure_streams call.
+     *
+     * Until finishConfiguration() is called, no other methods on the stream may
+     * be called. The usage and max_buffers fields of camera3_stream may be
+     * modified between start/finishConfiguration, but may not be changed after
+     * that. The priv field of camera3_stream may be modified at any time after
+     * startConfiguration.
+     *
+     * Returns NULL in case of error starting configuration.
+     */
+    virtual camera3_stream* startConfiguration() = 0;
+
+    /**
+     * Check if the stream is mid-configuration (start has been called, but not
+     * finish).  Used for lazy completion of configuration.
+     */
+    virtual bool    isConfiguring() const = 0;
+
+    /**
+     * Completes the stream configuration process. During this call, the stream
+     * may call the device's register_stream_buffers() method. The stream
+     * information structure returned by startConfiguration() may no longer be
+     * modified after this call, but can still be read until the destruction of
+     * the stream.
+     *
+     * Returns:
+     *   OK on a successful configuration
+     *   NO_INIT in case of a serious error from the HAL device
+     *   NO_MEMORY in case of an error registering buffers
+     *   INVALID_OPERATION in case connecting to the consumer failed
+     */
+    virtual status_t finishConfiguration(camera3_device *hal3Device) = 0;
+
+    /**
+     * Fill in the camera3_stream_buffer with the next valid buffer for this
+     * stream, to hand over to the HAL.
+     *
+     * This method may only be called once finishConfiguration has been called.
+     * For bidirectional streams, this method applies to the output-side
+     * buffers.
+     *
+     */
+    virtual status_t getBuffer(camera3_stream_buffer *buffer) = 0;
+
+    /**
+     * Return a buffer to the stream after use by the HAL.
+     *
+     * This method may only be called for buffers provided by getBuffer().
+     * For bidirectional streams, this method applies to the output-side buffers
+     */
+    virtual status_t returnBuffer(const camera3_stream_buffer &buffer,
+            nsecs_t timestamp) = 0;
+
+    /**
+     * Fill in the camera3_stream_buffer with the next valid buffer for this
+     * stream, to hand over to the HAL.
+     *
+     * This method may only be called once finishConfiguration has been called.
+     * For bidirectional streams, this method applies to the input-side
+     * buffers.
+     *
+     */
+    virtual status_t getInputBuffer(camera3_stream_buffer *buffer) = 0;
+
+    /**
+     * Return a buffer to the stream after use by the HAL.
+     *
+     * This method may only be called for buffers provided by getBuffer().
+     * For bidirectional streams, this method applies to the input-side buffers
+     */
+    virtual status_t returnInputBuffer(const camera3_stream_buffer &buffer) = 0;
+
+    /**
+     * Whether any of the stream's buffers are currently in use by the HAL,
+     * including buffers that have been returned but not yet had their
+     * release fence signaled.
+     */
+    virtual bool     hasOutstandingBuffers() const = 0;
+
+    enum {
+        TIMEOUT_NEVER = -1
+    };
+
+    /**
+     * Set the state tracker to use for signaling idle transitions.
+     */
+    virtual status_t setStatusTracker(sp<StatusTracker> statusTracker) = 0;
+
+    /**
+     * Disconnect stream from its non-HAL endpoint. After this,
+     * start/finishConfiguration must be called before the stream can be used
+     * again. This cannot be called if the stream has outstanding dequeued
+     * buffers.
+     */
+    virtual status_t disconnect() = 0;
+
+    /**
+     * Debug dump of the stream's state.
+     */
+    virtual void     dump(int fd, const Vector<String16> &args) const = 0;
+
+    virtual void     addBufferListener(
+            wp<Camera3StreamBufferListener> listener) = 0;
+    virtual void     removeBufferListener(
+            const sp<Camera3StreamBufferListener>& listener) = 0;
+};
+
+} // namespace camera3
+
+} // namespace android
+
+#endif