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diff --git a/include/hardware_legacy/AudioHardwareBase.h b/include/hardware_legacy/AudioHardwareBase.h
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+++ b/include/hardware_legacy/AudioHardwareBase.h
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+/*
+ * Copyright (C) 2007 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_AUDIO_HARDWARE_BASE_H
+#define ANDROID_AUDIO_HARDWARE_BASE_H
+
+#include "hardware_legacy/AudioHardwareInterface.h"
+
+
+namespace android {
+
+// ----------------------------------------------------------------------------
+
+/** 
+ * AudioHardwareBase is a convenient base class used for implementing the 
+ * AudioHardwareInterface interface.
+ */
+class AudioHardwareBase : public AudioHardwareInterface
+{
+public:
+                        AudioHardwareBase();
+    virtual             ~AudioHardwareBase() { }
+
+    /**  
+     * Audio routing methods. Routes defined in include/hardware_legacy/AudioSystem.h. 
+     * Audio routes can be (ROUTE_EARPIECE | ROUTE_SPEAKER | ROUTE_BLUETOOTH 
+     *                    | ROUTE_HEADSET)
+     * 
+     * setRouting sets the routes for a mode. This is called at startup. It is
+     * also called when a new device is connected, such as a wired headset is 
+     * plugged in or a Bluetooth headset is paired.
+     */
+    virtual status_t    setRouting(int mode, uint32_t routes);
+    
+    virtual status_t    getRouting(int mode, uint32_t* routes);
+    
+    /**
+     * setMode is called when the audio mode changes. NORMAL mode is for
+     * standard audio playback, RINGTONE when a ringtone is playing, and IN_CALL
+     * when a call is in progress.
+     */
+    virtual status_t    setMode(int mode);
+    virtual status_t    getMode(int* mode);
+
+    // Temporary interface, do not use
+    // TODO: Replace with a more generic key:value get/set mechanism
+    virtual status_t    setParameter(const char* key, const char* value);
+    
+    virtual  size_t     getInputBufferSize(uint32_t sampleRate, int format, int channelCount);
+    
+    /**This method dumps the state of the audio hardware */
+    virtual status_t dumpState(int fd, const Vector<String16>& args);
+
+protected:
+    int             mMode;
+    uint32_t        mRoutes[AudioSystem::NUM_MODES];
+};
+
+}; // namespace android
+
+#endif // ANDROID_AUDIO_HARDWARE_BASE_H