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diff --git a/webrtc/video/report_block_stats.h b/webrtc/video/report_block_stats.h
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+++ b/webrtc/video/report_block_stats.h
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+/*
+ *  Copyright (c) 2014 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#ifndef WEBRTC_VIDEO_REPORT_BLOCK_STATS_H_
+#define WEBRTC_VIDEO_REPORT_BLOCK_STATS_H_
+
+#include <map>
+#include <vector>
+
+#include "webrtc/common_types.h"
+#include "webrtc/modules/rtp_rtcp/include/rtp_rtcp_defines.h"
+
+namespace webrtc {
+
+// Helper class for rtcp statistics.
+class ReportBlockStats {
+ public:
+  typedef std::map<uint32_t, RTCPReportBlock> ReportBlockMap;
+  typedef std::vector<RTCPReportBlock> ReportBlockVector;
+  ReportBlockStats();
+  ~ReportBlockStats() {}
+
+  // Updates stats and stores report blocks.
+  // Returns an aggregate of the |report_blocks|.
+  RTCPReportBlock AggregateAndStore(const ReportBlockVector& report_blocks);
+
+  // Updates stats and stores report block.
+  void Store(const RtcpStatistics& rtcp_stats,
+             uint32_t remote_ssrc,
+             uint32_t source_ssrc);
+
+  // Returns the total fraction of lost packets (or -1 if less than two report
+  // blocks have been stored).
+  int FractionLostInPercent() const;
+
+ private:
+  // Updates the total number of packets/lost packets.
+  // Stores the report block.
+  // Returns the number of packets/lost packets since previous report block.
+  void StoreAndAddPacketIncrement(const RTCPReportBlock& report_block,
+                                  uint32_t* num_sequence_numbers,
+                                  uint32_t* num_lost_sequence_numbers);
+
+  // The total number of packets/lost packets.
+  uint32_t num_sequence_numbers_;
+  uint32_t num_lost_sequence_numbers_;
+
+  // Map holding the last stored report block (mapped by the source SSRC).
+  ReportBlockMap prev_report_blocks_;
+};
+
+}  // namespace webrtc
+
+#endif  // WEBRTC_VIDEO_REPORT_BLOCK_STATS_H_
+