diff --git a/media/libmedia/IAudioTrack.cpp b/media/libmedia/IAudioTrack.cpp
new file mode 100644
index 0000000..abc202d
--- /dev/null
+++ b/media/libmedia/IAudioTrack.cpp
@@ -0,0 +1,140 @@
+/* //device/extlibs/pv/android/IAudioTrack.cpp
+**
+** Copyright 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.
+*/
+
+#include <stdint.h>
+#include <sys/types.h>
+
+#include <utils/Parcel.h>
+
+#include <media/IAudioTrack.h>
+
+namespace android {
+
+enum {
+    GET_CBLK = IBinder::FIRST_CALL_TRANSACTION,
+    START,
+    STOP,
+    FLUSH,
+    MUTE,
+    PAUSE
+};
+
+class BpAudioTrack : public BpInterface<IAudioTrack>
+{
+public:
+    BpAudioTrack(const sp<IBinder>& impl)
+        : BpInterface<IAudioTrack>(impl)
+    {
+    }
+    
+    virtual status_t start()
+    {
+        Parcel data, reply;
+        data.writeInterfaceToken(IAudioTrack::getInterfaceDescriptor());
+        remote()->transact(START, data, &reply);
+        return reply.readInt32();
+    }
+    
+    virtual void stop()
+    {
+        Parcel data, reply;
+        data.writeInterfaceToken(IAudioTrack::getInterfaceDescriptor());
+        remote()->transact(STOP, data, &reply);
+    }
+    
+    virtual void flush()
+    {
+        Parcel data, reply;
+        data.writeInterfaceToken(IAudioTrack::getInterfaceDescriptor());
+        remote()->transact(FLUSH, data, &reply);
+    }
+
+    virtual void mute(bool e)
+    {
+        Parcel data, reply;
+        data.writeInterfaceToken(IAudioTrack::getInterfaceDescriptor());
+        data.writeInt32(e);
+        remote()->transact(MUTE, data, &reply);
+    }
+    
+    virtual void pause()
+    {
+        Parcel data, reply;
+        data.writeInterfaceToken(IAudioTrack::getInterfaceDescriptor());
+        remote()->transact(PAUSE, data, &reply);
+    }
+    
+    virtual sp<IMemory> getCblk() const
+    {
+        Parcel data, reply;
+        data.writeInterfaceToken(IAudioTrack::getInterfaceDescriptor());
+        remote()->transact(GET_CBLK, data, &reply);
+        return interface_cast<IMemory>(reply.readStrongBinder());
+    }    
+};
+
+IMPLEMENT_META_INTERFACE(AudioTrack, "android.media.IAudioTrack");
+
+// ----------------------------------------------------------------------
+
+#define CHECK_INTERFACE(interface, data, reply) \
+        do { if (!data.enforceInterface(interface::getInterfaceDescriptor())) { \
+            LOGW("Call incorrectly routed to " #interface); \
+            return PERMISSION_DENIED; \
+        } } while (0)
+
+status_t BnAudioTrack::onTransact(
+    uint32_t code, const Parcel& data, Parcel* reply, uint32_t flags)
+{
+    switch(code) {
+       case GET_CBLK: {
+            CHECK_INTERFACE(IAudioTrack, data, reply);
+            reply->writeStrongBinder(getCblk()->asBinder());
+            return NO_ERROR;
+        } break;
+        case START: {
+            CHECK_INTERFACE(IAudioTrack, data, reply);
+            reply->writeInt32(start());
+            return NO_ERROR;
+        } break;
+        case STOP: {
+            CHECK_INTERFACE(IAudioTrack, data, reply);
+            stop();
+            return NO_ERROR;
+        } break;
+        case FLUSH: {
+            CHECK_INTERFACE(IAudioTrack, data, reply);
+            flush();
+            return NO_ERROR;
+        } break;
+        case MUTE: {
+            CHECK_INTERFACE(IAudioTrack, data, reply);
+            mute( data.readInt32() );
+            return NO_ERROR;
+        } break;
+        case PAUSE: {
+            CHECK_INTERFACE(IAudioTrack, data, reply);
+            pause();
+            return NO_ERROR;
+        }
+        default:
+            return BBinder::onTransact(code, data, reply, flags);
+    }
+}
+
+}; // namespace android
+