diff --git a/include/media/AudioSystem.h b/include/media/AudioSystem.h
new file mode 100644
index 0000000..77c90ba
--- /dev/null
+++ b/include/media/AudioSystem.h
@@ -0,0 +1,177 @@
+/*
+ * Copyright (C) 2008 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_AUDIOSYSTEM_H_
+#define ANDROID_AUDIOSYSTEM_H_
+
+#include <utils/RefBase.h>
+#include <utils/threads.h>
+#include <media/IAudioFlinger.h>
+
+namespace android {
+
+typedef void (*audio_error_callback)(status_t err);
+
+class AudioSystem
+{
+public:
+
+    enum stream_type {
+        DEFAULT         =-1,
+        VOICE_CALL      = 0,
+        SYSTEM          = 1,
+        RING            = 2,
+        MUSIC           = 3,
+        ALARM           = 4,
+        NOTIFICATION    = 5,
+        BLUETOOTH_SCO   = 6,
+        NUM_STREAM_TYPES
+    };
+
+    enum audio_output_type {
+        AUDIO_OUTPUT_DEFAULT      =-1,
+        AUDIO_OUTPUT_HARDWARE     = 0,
+        AUDIO_OUTPUT_A2DP         = 1,
+        NUM_AUDIO_OUTPUT_TYPES
+    };
+
+    enum audio_format {
+        FORMAT_DEFAULT = 0,
+        PCM_16_BIT,
+        PCM_8_BIT,
+        INVALID_FORMAT
+    };
+
+    enum audio_mode {
+        MODE_INVALID = -2,
+        MODE_CURRENT = -1,
+        MODE_NORMAL = 0,
+        MODE_RINGTONE,
+        MODE_IN_CALL,
+        NUM_MODES  // not a valid entry, denotes end-of-list
+    };
+
+    enum audio_routes {
+        ROUTE_EARPIECE       = (1 << 0),
+        ROUTE_SPEAKER        = (1 << 1),
+        ROUTE_BLUETOOTH_SCO  = (1 << 2),
+        ROUTE_HEADSET        = (1 << 3),
+        ROUTE_BLUETOOTH_A2DP = (1 << 4),
+        ROUTE_ALL            = -1UL,
+    };
+
+    enum audio_in_acoustics {
+        AGC_ENABLE    = 0x0001,
+        AGC_DISABLE   = 0,
+        NS_ENABLE     = 0x0002,
+        NS_DISABLE    = 0,
+        TX_IIR_ENABLE = 0x0004,
+        TX_DISABLE    = 0
+    };
+
+    /* These are static methods to control the system-wide AudioFlinger
+     * only privileged processes can have access to them
+     */
+
+    // routing helper functions
+    static status_t speakerphone(bool state);
+    static status_t isSpeakerphoneOn(bool* state);
+    static status_t bluetoothSco(bool state);
+    static status_t isBluetoothScoOn(bool* state);
+    static status_t muteMicrophone(bool state);
+    static status_t isMicrophoneMuted(bool *state);
+
+    static status_t setMasterVolume(float value);
+    static status_t setMasterMute(bool mute);
+    static status_t getMasterVolume(float* volume);
+    static status_t getMasterMute(bool* mute);
+
+    static status_t setStreamVolume(int stream, float value);
+    static status_t setStreamMute(int stream, bool mute);
+    static status_t getStreamVolume(int stream, float* volume);
+    static status_t getStreamMute(int stream, bool* mute);
+
+    static status_t setMode(int mode);
+    static status_t getMode(int* mode);
+
+    static status_t setRouting(int mode, uint32_t routes, uint32_t mask);
+    static status_t getRouting(int mode, uint32_t* routes);
+
+    static status_t isMusicActive(bool *state);
+
+    // Temporary interface, do not use
+    // TODO: Replace with a more generic key:value get/set mechanism
+    static status_t setParameter(const char* key, const char* value);
+    
+    static void setErrorCallback(audio_error_callback cb);
+
+    // helper function to obtain AudioFlinger service handle
+    static const sp<IAudioFlinger>& get_audio_flinger();
+
+    static float linearToLog(int volume);
+    static int logToLinear(float volume);
+
+    static status_t getOutputSamplingRate(int* samplingRate, int stream = DEFAULT);
+    static status_t getOutputFrameCount(int* frameCount, int stream = DEFAULT);
+    static status_t getOutputLatency(uint32_t* latency, int stream = DEFAULT);
+
+    static bool routedToA2dpOutput(int streamType);
+    
+    static status_t getInputBufferSize(uint32_t sampleRate, int format, int channelCount, 
+        size_t* buffSize);
+
+    // ----------------------------------------------------------------------------
+
+private:
+
+    class AudioFlingerClient: public IBinder::DeathRecipient, public BnAudioFlingerClient
+    {
+    public:
+        AudioFlingerClient() {      
+        }
+        
+        // DeathRecipient
+        virtual void binderDied(const wp<IBinder>& who);
+        
+        // IAudioFlingerClient
+        virtual void a2dpEnabledChanged(bool enabled);
+        
+    };
+    static int getOutput(int streamType);
+
+    static sp<AudioFlingerClient> gAudioFlingerClient;
+
+    friend class AudioFlingerClient;
+
+    static Mutex gLock;
+    static sp<IAudioFlinger> gAudioFlinger;
+    static audio_error_callback gAudioErrorCallback;
+    static int gOutSamplingRate[NUM_AUDIO_OUTPUT_TYPES];
+    static int gOutFrameCount[NUM_AUDIO_OUTPUT_TYPES];
+    static uint32_t gOutLatency[NUM_AUDIO_OUTPUT_TYPES];
+    static bool gA2dpEnabled;
+    
+    static size_t gInBuffSize;
+    // previous parameters for recording buffer size queries
+    static uint32_t gPrevInSamplingRate;
+    static int gPrevInFormat;
+    static int gPrevInChannelCount;
+
+};
+
+};  // namespace android
+
+#endif  /*ANDROID_AUDIOSYSTEM_H_*/