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diff --git a/services/audiopolicy/engineconfigurable/src/Stream.h b/services/audiopolicy/engineconfigurable/src/Stream.h
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+++ b/services/audiopolicy/engineconfigurable/src/Stream.h
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+/*
+ * Copyright (C) 2015 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.
+ */
+
+#pragma once
+
+#include "Element.h"
+#include "EngineDefinition.h"
+#include <Volume.h>
+#include <RoutingStrategy.h>
+#include <map>
+
+namespace android
+{
+namespace audio_policy
+{
+/**
+ * @tparam routing_strategy: Applicable strategy for this stream.
+ */
+template <>
+class Element<audio_stream_type_t>
+{
+private:
+    typedef std::map<Volume::device_category, VolumeCurvePoints> VolumeProfiles;
+    typedef VolumeProfiles::iterator VolumeProfileIterator;
+    typedef VolumeProfiles::const_iterator VolumeProfileConstIterator;
+
+public:
+    Element(const std::string &name)
+        : mName(name),
+          mApplicableStrategy(STRATEGY_MEDIA),
+          mIndexMin(0),
+          mIndexMax(1)
+    {}
+    ~Element() {}
+
+    /**
+     * Returns identifier of this policy element
+     *
+     * @returns string representing the name of this policy element
+     */
+    const std::string &getName() const { return mName; }
+
+    /**
+    * Set the unique identifier for this policy element.
+    *
+    * @tparam Key type of the unique identifier.
+    * @param[in] identifier to be set.
+    *
+    * @return NO_ERROR if the identifier is valid and set correctly, error code otherwise.
+    */
+    status_t setIdentifier(audio_stream_type_t identifier);
+
+    /**
+     * @return the unique identifier of this policy element.
+     */
+    audio_stream_type_t getIdentifier() const { return mIdentifier; }
+
+    /**
+     * A Policy element may implement getter/setter function for a given property.
+     * Property may be routing_strategy, audio_stream_type_t, audio_usage_t, audio_source_t
+     * or a string.
+     */
+    template <typename Property>
+    Property get() const;
+
+    template <typename Property>
+    status_t set(Property property);
+
+    status_t setVolumeProfile(Volume::device_category category, const VolumeCurvePoints &points);
+
+    float volIndexToDb(Volume::device_category deviceCategory, int indexInUi);
+
+    status_t initVolume(int indexMin, int indexMax);
+
+private:
+    /* Copy facilities are put private to disable copy. */
+    Element(const Element &object);
+    Element &operator=(const Element &object);
+
+    std::string mName; /**< Unique literal Identifier of a policy base element*/
+    audio_stream_type_t mIdentifier; /**< Unique numerical Identifier of a policy base element*/
+
+    routing_strategy mApplicableStrategy; /**< Applicable strategy for this stream. */
+
+    /**
+     * Collection of volume profiles indexed by the stream type.
+     * Volume is the only reason why the stream profile was not removed from policy when introducing
+     * attributes.
+     */
+    VolumeProfiles mVolumeProfiles;
+
+    int mIndexMin;
+
+    int mIndexMax;
+};
+
+typedef Element<audio_stream_type_t> Stream;
+
+} // namespace audio_policy
+} // namespace android
+
+