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diff --git a/media/libstagefright/wifi-display/sink/LinearRegression.h b/media/libstagefright/wifi-display/sink/LinearRegression.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 LINEAR_REGRESSION_H_
+
+#define LINEAR_REGRESSION_H_
+
+#include <sys/types.h>
+#include <media/stagefright/foundation/ABase.h>
+
+namespace android {
+
+// Helper class to fit a line to a set of points minimizing the sum of
+// squared (orthogonal) distances from line to individual points.
+struct LinearRegression {
+    LinearRegression(size_t historySize);
+    ~LinearRegression();
+
+    void addPoint(float x, float y);
+
+    bool approxLine(float *n1, float *n2, float *b) const;
+
+private:
+    struct Point {
+        float mX, mY;
+    };
+
+    size_t mHistorySize;
+    size_t mCount;
+    Point *mHistory;
+
+    float mSumX, mSumY;
+
+    DISALLOW_EVIL_CONSTRUCTORS(LinearRegression);
+};
+
+}  // namespace android
+
+#endif  // LINEAR_REGRESSION_H_