diff --git a/broadcastradio/1.2/default/VirtualRadio.h b/broadcastradio/1.2/default/VirtualRadio.h
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+++ b/broadcastradio/1.2/default/VirtualRadio.h
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+/*
+ * Copyright (C) 2017 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_HARDWARE_BROADCASTRADIO_V1_2_VIRTUALRADIO_H
+#define ANDROID_HARDWARE_BROADCASTRADIO_V1_2_VIRTUALRADIO_H
+
+#include "VirtualProgram.h"
+
+#include <mutex>
+#include <vector>
+
+namespace android {
+namespace hardware {
+namespace broadcastradio {
+namespace V1_2 {
+namespace implementation {
+
+/**
+ * A radio frequency space mock.
+ *
+ * This represents all broadcast waves in the air for a given radio technology,
+ * not a captured station list in the radio tuner memory.
+ *
+ * It's meant to abstract out radio content from default tuner implementation.
+ */
+class VirtualRadio {
+   public:
+    VirtualRadio(const std::vector<VirtualProgram> initialList);
+
+    std::vector<VirtualProgram> getProgramList();
+    bool getProgram(const V1_1::ProgramSelector& selector, VirtualProgram& program);
+
+   private:
+    std::mutex mMut;
+    std::vector<VirtualProgram> mPrograms;
+};
+
+/**
+ * Get virtual radio space for a given radio class.
+ *
+ * As a space, each virtual radio always exists. For example, DAB frequencies
+ * exists in US, but contains no programs.
+ *
+ * The lifetime of the virtual radio space is virtually infinite, but for the
+ * needs of default implementation, it's bound with the lifetime of default
+ * implementation process.
+ *
+ * Internally, it's a static object, so trying to access the reference during
+ * default implementation library unloading may result in segmentation fault.
+ * It's unlikely for testing purposes.
+ *
+ * @param classId A class of radio technology.
+ * @return A reference to virtual radio space for a given technology.
+ */
+VirtualRadio& getRadio(V1_0::Class classId);
+
+VirtualRadio& getAmRadio();
+VirtualRadio& getFmRadio();
+VirtualRadio& getSatRadio();
+VirtualRadio& getDigitalRadio();
+
+}  // namespace implementation
+}  // namespace V1_2
+}  // namespace broadcastradio
+}  // namespace hardware
+}  // namespace android
+
+#endif  // ANDROID_HARDWARE_BROADCASTRADIO_V1_2_VIRTUALRADIO_H