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diff --git a/media/libstagefright/wifi-display/SNTPClient.h b/media/libstagefright/wifi-display/SNTPClient.h
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+++ b/media/libstagefright/wifi-display/SNTPClient.h
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+/*
+ * Copyright 2013, 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 SNTP_CLIENT_H_
+
+#define SNTP_CLIENT_H_
+
+#include <media/stagefright/foundation/ABase.h>
+#include <utils/Errors.h>
+
+namespace android {
+
+// Implementation of the SNTP (Simple Network Time Protocol)
+struct SNTPClient {
+    SNTPClient();
+
+    status_t requestTime(const char *host);
+
+    // given a time obtained from ALooper::GetNowUs()
+    // return the number of us elapsed since Jan 1 1970 00:00:00 (UTC).
+    int64_t adjustTimeUs(int64_t timeUs) const;
+
+private:
+    enum {
+        kNTPPort = 123,
+        kNTPPacketSize = 48,
+        kNTPModeClient = 3,
+        kNTPVersion = 3,
+        kNTPTransmitTimeOffset = 40,
+        kNTPOriginateTimeOffset = 24,
+        kNTPReceiveTimeOffset = 32,
+    };
+
+    uint64_t mTimeReferenceNTP;
+    int64_t mTimeReferenceUs;
+    int64_t mRoundTripTimeNTP;
+
+    static void writeTimeStamp(uint8_t *dst, uint64_t ntpTime);
+    static uint64_t readTimeStamp(const uint8_t *dst);
+
+    static uint64_t getNowNTP();
+    static uint64_t makeNTP(uint64_t deltaUs);
+
+    DISALLOW_EVIL_CONSTRUCTORS(SNTPClient);
+};
+
+}  // namespace android
+
+#endif  // SNTP_CLIENT_H_