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diff --git a/qahw_api/inc/qahw_effect_visualizer.h b/qahw_api/inc/qahw_effect_visualizer.h
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+/*
+ * Copyright (c) 2017, The Linux Foundation. All rights reserved.
+ * Not a Contribution.
+ *
+ * Copyright (C) 2011 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 QAHW_EFFECT_VISUALIZER_H_
+#define QAHW_EFFECT_VISUALIZER_H_
+
+#include <qahw_effect_api.h>
+
+#if __cplusplus
+extern "C" {
+#endif
+
+#define QAHW_EFFECT_VISUALIZER_LIBRARY "libqcomvisualizer.so"
+
+static const qahw_effect_uuid_t SL_IID_VISUALIZATION_ =
+    { 0xe46b26a0, 0xdddd, 0x11db, 0x8afd, { 0x00, 0x02, 0xa5, 0xd5, 0xc5, 0x1b } };
+const qahw_effect_uuid_t * const SL_IID_VISUALIZATION = &SL_IID_VISUALIZATION_;
+
+static const qahw_effect_uuid_t SL_IID_VISUALIZATION_UUID_ =
+    { 0x7a8044a0, 0x1a71, 0x11e3, 0xa184, { 0x00, 0x02, 0xa5, 0xd5, 0xc5, 0x1b } };
+const qahw_effect_uuid_t * const SL_IID_VISUALIZATION_UUID = &SL_IID_VISUALIZATION_UUID_;
+
+#define VISUALIZER_CAPTURE_SIZE_MAX 1024  // maximum capture size in samples
+#define VISUALIZER_CAPTURE_SIZE_MIN 128   // minimum capture size in samples
+
+// to keep in sync with frameworks/base/media/java/android/media/audiofx/Visualizer.java
+#define VISUALIZER_SCALING_MODE_NORMALIZED 0
+#define VISUALIZER_SCALING_MODE_AS_PLAYED  1
+
+#define MEASUREMENT_MODE_NONE      0x0
+#define MEASUREMENT_MODE_PEAK_RMS  0x1
+
+#define MEASUREMENT_IDX_PEAK 0
+#define MEASUREMENT_IDX_RMS  1
+
+/* enumerated parameters for Visualizer effect */
+typedef enum
+{
+    VISUALIZER_PARAM_CAPTURE_SIZE, // Sets the number PCM samples in the capture.
+    VISUALIZER_PARAM_SCALING_MODE, // Sets the way the captured data is scaled
+    VISUALIZER_PARAM_LATENCY,      // Informs the visualizer about the downstream latency
+    VISUALIZER_PARAM_MEASUREMENT_MODE, // Sets which measurements are to be made
+} qahw_visualizer_params;
+
+/* commands */
+typedef enum
+{
+    VISUALIZER_CMD_CAPTURE = QAHW_EFFECT_CMD_FIRST_PROPRIETARY, // Gets the latest PCM capture.
+    VISUALIZER_CMD_MEASURE, // Gets the current measurements
+} qahw_visualizer_cmds;
+
+// VISUALIZER_CMD_CAPTURE retrieves the latest PCM snapshot captured by the visualizer engine.
+// It returns the number of samples specified by VISUALIZER_PARAM_CAPTURE_SIZE
+// in 8 bit unsigned format (0 = 0x80)
+
+// VISUALIZER_CMD_MEASURE retrieves the lastest measurements as int32_t saved in the
+// MEASUREMENT_IDX_* array index order.
+
+#if __cplusplus
+}  // extern "C"
+#endif
+
+#endif /*QAHW_EFFECT_VISUALIZER_H_*/