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diff --git a/services/audioflinger/FastMixer.h b/services/audioflinger/FastMixer.h
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+++ b/services/audioflinger/FastMixer.h
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+/*
+ * Copyright (C) 2012 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_FAST_MIXER_H
+#define ANDROID_AUDIO_FAST_MIXER_H
+
+#include <utils/Thread.h>
+extern "C" {
+#include "../private/bionic_futex.h"
+}
+#include "StateQueue.h"
+#include "FastMixerState.h"
+
+namespace android {
+
+typedef StateQueue<FastMixerState> FastMixerStateQueue;
+
+class FastMixer : public Thread {
+
+public:
+            FastMixer() : Thread(false /*canCallJava*/) { }
+    virtual ~FastMixer() { }
+
+            FastMixerStateQueue* sq() { return &mSQ; }
+
+private:
+    virtual bool                threadLoop();
+            FastMixerStateQueue mSQ;
+
+};  // class FastMixer
+
+// The FastMixerDumpState keeps a cache of FastMixer statistics that can be logged by dumpsys.
+// Since used non-atomically, only POD types are permitted, and the contents can't be trusted.
+// It has a different lifetime than the FastMixer, and so it can't be a member of FastMixer.
+struct FastMixerDumpState {
+    FastMixerDumpState();
+    /*virtual*/ ~FastMixerDumpState();
+
+    void dump(int fd);
+
+    FastMixerState::Command mCommand;   // current command
+    uint32_t mWriteSequence;    // incremented before and after each write()
+    uint32_t mFramesWritten;    // total number of frames written successfully
+    uint32_t mNumTracks;        // total number of active fast tracks
+    uint32_t mWriteErrors;      // total number of write() errors
+    uint32_t mUnderruns;        // total number of underruns
+    uint32_t mOverruns;         // total number of overruns
+#ifdef FAST_MIXER_STATISTICS
+    // cycle times in seconds
+    float    mMean;
+    float    mMinimum;
+    float    mMaximum;
+    float    mStddev;
+#endif
+};
+
+}   // namespace android
+
+#endif  // ANDROID_AUDIO_FAST_MIXER_H