[rtp_rtcp] ReportBlockInformation cleaned and moved out of the rtcp_receiver_help.

webrtc/modules/rtp_rtcp/source/report_block_information.h

+/*
+ *  Copyright (c) 2016 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_MODULES_RTP_RTCP_SOURCE_REPORT_BLOCK_INFORMATION_H_
+#define WEBRTC_MODULES_RTP_RTCP_SOURCE_REPORT_BLOCK_INFORMATION_H_
+
+#include "webrtc/base/basictypes.h"
+#include "webrtc/modules/rtp_rtcp/include/rtp_rtcp_defines.h"
+#include "webrtc/system_wrappers/include/ntp_time.h"
+
+namespace webrtc {
+namespace RTCPUtility {
+struct RTCPPacketReportBlockItem;
+}  // namespace RTCPUtility
+
+namespace rtcp {
+class ReportBlock;
+
+// Keeps last received report block and some additional statistic information.
+class ReportBlockInformation {
+ public:
+  ReportBlockInformation();
+  ReportBlockInformation(const ReportBlockInformation&) = default;
+  ~ReportBlockInformation() {}
+
+  ReportBlockInformation& operator=(const ReportBlockInformation&) = default;
+  // TODO(danilchap): Remove this version of the
+  // function when RTCP parsing would switch from RTCPUtility.
+  void AddBlock(const RTCPUtility::RTCPPacketReportBlockItem& block,
+                uint32_t remote_ssrc,
+                NtpTime now);
+  void AddBlock(const rtcp::ReportBlock& block,
+                uint32_t remote_ssrc,
+                NtpTime now);
+
+  const RTCPReportBlock& LastBlock() const;
+  bool HasRtt() const;
+  int64_t LastRttMs() const;
+  int64_t MinRttMs() const;
+  int64_t MaxRttMs() const;
+  int64_t AvgRttMs() const;
+
+ private:
+  // TODO(danilchap): Incorporate this function into AddBlock when only one
+  // version would be left.
+  void AddRtt(NtpTime now);
+  // Number of blocks received where rtt could be calculated.
+  size_t number_rtt_;
+  // rtt is stored in 1/2^16 seconds (compact ntp representation).
+  uint32_t last_rtt_;
+  uint32_t min_rtt_;
+  uint32_t max_rtt_;
+  uint64_t sum_rtt_;
+  RTCPReportBlock last_received_block_;
+};
+}  // namespace rtcp
+}  // namespace webrtc
+#endif  // WEBRTC_MODULES_RTP_RTCP_SOURCE_REPORT_BLOCK_INFORMATION_H_