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diff --git a/services/camera/libcameraservice/device3/Camera3ZslStream.h b/services/camera/libcameraservice/device3/Camera3ZslStream.h
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+++ b/services/camera/libcameraservice/device3/Camera3ZslStream.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_ZSL_STREAM_H
+#define ANDROID_SERVERS_CAMERA3_ZSL_STREAM_H
+
+#include <utils/RefBase.h>
+#include <gui/Surface.h>
+#include <gui/RingBufferConsumer.h>
+
+#include "Camera3OutputStream.h"
+
+namespace android {
+
+namespace camera3 {
+
+/**
+ * A class for managing a single opaque ZSL stream to/from the camera device.
+ * This acts as a bidirectional stream at the HAL layer, caching and discarding
+ * most output buffers, and when directed, pushes a buffer back to the HAL for
+ * processing.
+ */
+class Camera3ZslStream :
+        public Camera3OutputStream {
+  public:
+    /**
+     * Set up a ZSL stream of a given resolution. Depth is the number of buffers
+     * cached within the stream that can be retrieved for input.
+     */
+    Camera3ZslStream(int id, uint32_t width, uint32_t height, int depth);
+    ~Camera3ZslStream();
+
+    virtual void     dump(int fd, const Vector<String16> &args) const;
+
+    enum { NO_BUFFER_AVAILABLE = BufferQueue::NO_BUFFER_AVAILABLE };
+
+    /**
+     * Locate a buffer matching this timestamp in the RingBufferConsumer,
+     * and mark it to be queued at the next getInputBufferLocked invocation.
+     *
+     * Errors: Returns NO_BUFFER_AVAILABLE if we could not find a match.
+     *
+     */
+    status_t enqueueInputBufferByTimestamp(nsecs_t timestamp,
+                                           nsecs_t* actualTimestamp);
+
+    /**
+     * Clears the buffers that can be used by enqueueInputBufferByTimestamp
+     */
+    status_t clearInputRingBuffer();
+
+  protected:
+
+    /**
+     * Camera3OutputStreamInterface implementation
+     */
+    status_t setTransform(int transform);
+
+  private:
+
+    int mDepth;
+    // Input buffers pending to be queued into HAL
+    List<sp<RingBufferConsumer::PinnedBufferItem> > mInputBufferQueue;
+    sp<RingBufferConsumer>                          mProducer;
+
+    // Input buffers in flight to HAL
+    Vector<sp<RingBufferConsumer::PinnedBufferItem> > mBuffersInFlight;
+
+    /**
+     * Camera3Stream interface
+     */
+
+    // getInputBuffer/returnInputBuffer operate the input stream side of the
+    // ZslStream.
+    virtual status_t getInputBufferLocked(camera3_stream_buffer *buffer);
+    virtual status_t returnInputBufferLocked(
+            const camera3_stream_buffer &buffer);
+
+    // Actual body to return either input or output buffers
+    virtual status_t returnBufferCheckedLocked(
+            const camera3_stream_buffer &buffer,
+            nsecs_t timestamp,
+            bool output,
+            /*out*/
+            sp<Fence> *releaseFenceOut);
+}; // class Camera3ZslStream
+
+}; // namespace camera3
+
+}; // namespace android
+
+#endif