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diff --git a/services/audiopolicy/engineconfigurable/src/InputSource.h b/services/audiopolicy/engineconfigurable/src/InputSource.h
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+++ b/services/audiopolicy/engineconfigurable/src/InputSource.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"
+
+namespace android
+{
+namespace audio_policy
+{
+
+/**
+ * Specialization of policy base class element for audio_source_t
+ * @tparam audio_source_t Policy Base Element identified by the audio_source_t definition.
+ */
+template <>
+class Element<audio_source_t>
+{
+public:
+    Element(const std::string &name)
+        : mName(name),
+          mApplicableDevices(AUDIO_DEVICE_NONE)
+    {}
+    ~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_source_t identifier);
+
+    /**
+     * @return the unique identifier of this policy element.
+     */
+    audio_source_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);
+
+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_source_t mIdentifier; /**< Unique numerical Identifier of a policy base element*/
+
+    audio_devices_t mApplicableDevices; /**< Applicable input device for this input source. */
+};
+
+typedef Element<audio_source_t> InputSource;
+
+} // namespace audio_policy
+} // namespace android
+