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diff --git a/media/libstagefright/wifi-display/source/Serializer.h b/media/libstagefright/wifi-display/source/Serializer.h
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+++ b/media/libstagefright/wifi-display/source/Serializer.h
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+/*
+ * Copyright 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 SERIALIZER_H_
+
+#define SERIALIZER_H_
+
+#include <media/stagefright/foundation/AHandler.h>
+#include <utils/Vector.h>
+
+namespace android {
+
+struct AMessage;
+struct MediaSource;
+
+// After adding a number of MediaSource objects and starting the Serializer,
+// it'll emit their access units in order of increasing timestamps.
+struct Serializer : public AHandler {
+    enum {
+        kWhatEOS,
+        kWhatAccessUnit
+    };
+
+    // In throttled operation, data is emitted at a pace corresponding
+    // to the incoming media timestamps.
+    Serializer(bool throttle, const sp<AMessage> &notify);
+
+    ssize_t addSource(const sp<MediaSource> &source);
+
+    status_t start();
+    status_t stop();
+
+protected:
+    virtual void onMessageReceived(const sp<AMessage> &what);
+    virtual ~Serializer();
+
+private:
+    enum {
+        kWhatAddSource,
+        kWhatStart,
+        kWhatStop,
+        kWhatPoll
+    };
+
+    struct Track;
+
+    bool mThrottle;
+    sp<AMessage> mNotify;
+    Vector<sp<Track> > mTracks;
+
+    int32_t mPollGeneration;
+
+    int64_t mStartTimeUs;
+
+    status_t postSynchronouslyAndReturnError(const sp<AMessage> &msg);
+
+    ssize_t onAddSource(const sp<AMessage> &msg);
+    status_t onStart();
+    status_t onStop();
+    int64_t onPoll();
+
+    void schedulePoll(int64_t delayUs = 0ll);
+    void cancelPoll();
+
+    DISALLOW_EVIL_CONSTRUCTORS(Serializer);
+};
+
+}  // namespace android
+
+#endif  // SERIALIZER_H_
+