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diff --git a/amber/camera/libhdrplusclient/include/HdrPlusClientListener.h b/amber/camera/libhdrplusclient/include/HdrPlusClientListener.h
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+++ b/amber/camera/libhdrplusclient/include/HdrPlusClientListener.h
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+/*
+ * Copyright 2016 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 HDR_PLUS_CLIENT_LISTENER_H
+#define HDR_PLUS_CLIENT_LISTENER_H
+
+#include "hardware/camera3.h"
+#include "HdrPlusTypes.h"
+
+namespace android {
+
+
+class HdrPlusClient;
+
+/*
+ * HdrPlusClientListener defines callbacks that will be invoked by HdrPlusClient for events like
+ * returning capture results.
+ */
+class HdrPlusClientListener {
+public:
+    virtual ~HdrPlusClientListener() {};
+
+    /*
+     * Invoked when an HDR+ client is opened successfully via
+     * EaselManagerClient::openHdrPlusClientAsync.
+     */
+    virtual void onOpened(std::unique_ptr<HdrPlusClient> client) = 0;
+
+    /*
+     * Invoked when opening an HDR+ client failed via EaselManagerClient::openHdrPlusClientAsync.
+     *
+     * err is
+     *  -EEXIST:    if an HDR+ client is already opened.
+     *  -ENODEV:    if opening an HDR+ failed due to a serious error.
+     */
+    virtual void onOpenFailed(status_t err) = 0;
+
+    /*
+     * Invoked when HDR+ client is in a fatal error state. After receiving this error, calls to HDR+
+     * client will not succeed and HDR+ client should be closed.
+     */
+    virtual void onFatalError() = 0;
+
+    /*
+     * Invoked when a CaptureResult, containing a subset or all output buffers for a CaptureRequest,
+     * is received. This may be invoked multiple times for one CaptureRequest but each CaptureResult
+     * will contain distinct output buffers that have not been received yet.
+     */
+    virtual void onCaptureResult(pbcamera::CaptureResult *result,
+            const camera_metadata_t &resultMetadata) = 0;
+
+    /*
+     * Invoked when a failed CaptureResult, containing a subset or all output buffers for a
+     * CaptureRequest, is received. Output buffers in a failed capture result may contain garbage
+     * data. This may be invoked multiple times for one CaptureRequest but each CaptureResult
+     * will contain distinct output buffers that have not been received yet.
+     */
+    virtual void onFailedCaptureResult(pbcamera::CaptureResult *failedResult) = 0;
+
+    /*
+     * Invoked when HDR+ processing has started for a request. requestId is the ID of the request.
+     * apSensorTimestampNs is the AP sensor timestamp of the base frame, in nanoseconds.
+     */
+    virtual void onShutter(uint32_t requestId, int64_t apSensorTimestampNs) = 0;
+
+    /*
+     * Invoked when Easel is ready to take another HDR+ request.
+     */
+    virtual void onNextCaptureReady(uint32_t requestId) = 0;
+
+    /*
+     * Invoked when the postview for a request is ready.
+     */
+    virtual void onPostview(uint32_t requestId, std::unique_ptr<std::vector<uint8_t>> postview,
+            uint32_t width, uint32_t height, uint32_t stride, int32_t format) = 0;
+};
+
+} // namespace android
+
+#endif // HDR_PLUS_CLIENT_LISTENER_H