rtp_rtcp/source/rtcp_receiver_unittest.cc

/*
 *  Copyright (c) 2012 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.
 */


/*
 * This file includes unit tests for the RTCPReceiver.
 */
#include "testing/gmock/include/gmock/gmock.h"
#include "testing/gtest/include/gtest/gtest.h"

// Note: This file has no directory. Lint warning must be ignored.
#include "webrtc/common_types.h"
#include "webrtc/modules/remote_bitrate_estimator/include/mock/mock_remote_bitrate_observer.h"
#include "webrtc/modules/remote_bitrate_estimator/include/remote_bitrate_estimator.h"
#include "webrtc/modules/rtp_rtcp/source/rtcp_packet.h"
#include "webrtc/modules/rtp_rtcp/source/rtcp_receiver.h"
#include "webrtc/modules/rtp_rtcp/source/rtcp_sender.h"
#include "webrtc/modules/rtp_rtcp/source/rtp_rtcp_impl.h"
#include "webrtc/modules/rtp_rtcp/source/rtp_utility.h"

namespace webrtc {

namespace {  // Anonymous namespace; hide utility functions and classes.

// This test transport verifies that no functions get called.
class TestTransport : public Transport,
                      public NullRtpData {
 public:
  explicit TestTransport()
      : rtcp_receiver_(NULL) {
  }
  void SetRTCPReceiver(RTCPReceiver* rtcp_receiver) {
    rtcp_receiver_ = rtcp_receiver;
  }
  virtual int SendPacket(int /*ch*/, const void* /*data*/, int /*len*/) {
    ADD_FAILURE();  // FAIL() gives a compile error.
    return -1;
  }

  // Injects an RTCP packet into the receiver.
  virtual int SendRTCPPacket(int /* ch */, const void *packet, int packet_len) {
    ADD_FAILURE();
    return 0;
  }

  virtual int OnReceivedPayloadData(const uint8_t* payloadData,
                                    const uint16_t payloadSize,
                                    const WebRtcRTPHeader* rtpHeader) {
    ADD_FAILURE();
    return 0;
  }
  RTCPReceiver* rtcp_receiver_;
};

class RtcpReceiverTest : public ::testing::Test {
 protected:
  static const uint32_t kRemoteBitrateEstimatorMinBitrateBps = 30000;

  RtcpReceiverTest()
      : over_use_detector_options_(),
        system_clock_(1335900000),
        remote_bitrate_observer_(),
        remote_bitrate_estimator_(
            RemoteBitrateEstimatorFactory().Create(
                &remote_bitrate_observer_,
                &system_clock_,
                kMimdControl,
                kRemoteBitrateEstimatorMinBitrateBps)) {
    test_transport_ = new TestTransport();

    RtpRtcp::Configuration configuration;
    configuration.id = 0;
    configuration.audio = false;
    configuration.clock = &system_clock_;
    configuration.outgoing_transport = test_transport_;
    configuration.remote_bitrate_estimator = remote_bitrate_estimator_.get();
    rtp_rtcp_impl_ = new ModuleRtpRtcpImpl(configuration);
    rtcp_receiver_ = new RTCPReceiver(0, &system_clock_, rtp_rtcp_impl_);
    test_transport_->SetRTCPReceiver(rtcp_receiver_);
  }
  ~RtcpReceiverTest() {
    delete rtcp_receiver_;
    delete rtp_rtcp_impl_;
    delete test_transport_;
  }

  // Injects an RTCP packet into the receiver.
  // Returns 0 for OK, non-0 for failure.
  int InjectRtcpPacket(const uint8_t* packet,
                       uint16_t packet_len) {
    RTCPUtility::RTCPParserV2 rtcpParser(packet,
                                         packet_len,
                                         true);  // Allow non-compound RTCP

    RTCPHelp::RTCPPacketInformation rtcpPacketInformation;
    EXPECT_EQ(0, rtcp_receiver_->IncomingRTCPPacket(rtcpPacketInformation,
                                                    &rtcpParser));
    rtcp_receiver_->TriggerCallbacksFromRTCPPacket(rtcpPacketInformation);
    // The NACK list is on purpose not copied below as it isn't needed by the
    // test.
    rtcp_packet_info_.rtcpPacketTypeFlags =
        rtcpPacketInformation.rtcpPacketTypeFlags;
    rtcp_packet_info_.remoteSSRC = rtcpPacketInformation.remoteSSRC;
    rtcp_packet_info_.applicationSubType =
        rtcpPacketInformation.applicationSubType;
    rtcp_packet_info_.applicationName = rtcpPacketInformation.applicationName;
    rtcp_packet_info_.report_blocks = rtcpPacketInformation.report_blocks;
    rtcp_packet_info_.rtt = rtcpPacketInformation.rtt;
    rtcp_packet_info_.interArrivalJitter =
        rtcpPacketInformation.interArrivalJitter;
    rtcp_packet_info_.sliPictureId = rtcpPacketInformation.sliPictureId;
    rtcp_packet_info_.rpsiPictureId = rtcpPacketInformation.rpsiPictureId;
    rtcp_packet_info_.receiverEstimatedMaxBitrate =
        rtcpPacketInformation.receiverEstimatedMaxBitrate;
    rtcp_packet_info_.ntp_secs = rtcpPacketInformation.ntp_secs;
    rtcp_packet_info_.ntp_frac = rtcpPacketInformation.ntp_frac;
    rtcp_packet_info_.rtp_timestamp = rtcpPacketInformation.rtp_timestamp;
    rtcp_packet_info_.xr_dlrr_item = rtcpPacketInformation.xr_dlrr_item;
    if (rtcpPacketInformation.VoIPMetric) {
      rtcp_packet_info_.AddVoIPMetric(rtcpPacketInformation.VoIPMetric);
    }
    return 0;
  }

  OverUseDetectorOptions over_use_detector_options_;
  SimulatedClock system_clock_;
  ModuleRtpRtcpImpl* rtp_rtcp_impl_;
  RTCPReceiver* rtcp_receiver_;
  TestTransport* test_transport_;
  RTCPHelp::RTCPPacketInformation rtcp_packet_info_;
  MockRemoteBitrateObserver remote_bitrate_observer_;
  scoped_ptr<RemoteBitrateEstimator> remote_bitrate_estimator_;
};


TEST_F(RtcpReceiverTest, BrokenPacketIsIgnored) {
  const uint8_t bad_packet[] = {0, 0, 0, 0};
  EXPECT_EQ(0, InjectRtcpPacket(bad_packet, sizeof(bad_packet)));
  EXPECT_EQ(0U, rtcp_packet_info_.rtcpPacketTypeFlags);
}

TEST_F(RtcpReceiverTest, InjectSrPacket) {
  const uint32_t kSenderSsrc = 0x10203;
  rtcp::SenderReport sr;
  sr.From(kSenderSsrc);
  rtcp::RawPacket p = sr.Build();
  EXPECT_EQ(0, InjectRtcpPacket(p.buffer(), p.buffer_length()));
  // The parser will note the remote SSRC on a SR from other than his
  // expected peer, but will not flag that he's gotten a packet.
  EXPECT_EQ(kSenderSsrc, rtcp_packet_info_.remoteSSRC);
  EXPECT_EQ(0U,
            kRtcpSr & rtcp_packet_info_.rtcpPacketTypeFlags);
}

TEST_F(RtcpReceiverTest, XrPacketWithZeroReportBlocksIgnored) {
  rtcp::Xr xr;
  xr.From(0x2345);
  rtcp::RawPacket p = xr.Build();
  EXPECT_EQ(0, InjectRtcpPacket(p.buffer(), p.buffer_length()));
  EXPECT_EQ(0U, rtcp_packet_info_.rtcpPacketTypeFlags);
}

TEST_F(RtcpReceiverTest, InjectXrVoipPacket) {
  const uint32_t kSourceSsrc = 0x123456;
  std::set<uint32_t> ssrcs;
  ssrcs.insert(kSourceSsrc);
  rtcp_receiver_->SetSsrcs(kSourceSsrc, ssrcs);

  const uint8_t kLossRate = 123;
  rtcp::VoipMetric voip_metric;
  voip_metric.To(kSourceSsrc);
  voip_metric.LossRate(kLossRate);
  rtcp::Xr xr;
  xr.From(0x2345);
  xr.WithVoipMetric(&voip_metric);
  rtcp::RawPacket p = xr.Build();
  EXPECT_EQ(0, InjectRtcpPacket(p.buffer(), p.buffer_length()));
  ASSERT_TRUE(rtcp_packet_info_.VoIPMetric != NULL);
  EXPECT_EQ(kLossRate, rtcp_packet_info_.VoIPMetric->lossRate);
  EXPECT_EQ(kRtcpXrVoipMetric, rtcp_packet_info_.rtcpPacketTypeFlags);
}

TEST_F(RtcpReceiverTest, XrVoipPacketNotToUsIgnored) {
  const uint32_t kSourceSsrc = 0x123456;
  std::set<uint32_t> ssrcs;
  ssrcs.insert(kSourceSsrc);
  rtcp_receiver_->SetSsrcs(kSourceSsrc, ssrcs);

  rtcp::VoipMetric voip_metric;
  voip_metric.To(kSourceSsrc + 1);
  rtcp::Xr xr;
  xr.From(0x2345);
  xr.WithVoipMetric(&voip_metric);
  rtcp::RawPacket p = xr.Build();
  EXPECT_EQ(0, InjectRtcpPacket(p.buffer(), p.buffer_length()));
  EXPECT_EQ(0U, rtcp_packet_info_.rtcpPacketTypeFlags);
}

TEST_F(RtcpReceiverTest, InjectXrReceiverReferenceTimePacket) {
  rtcp::Rrtr rrtr;
  rrtr.WithNtpSec(0x10203);
  rrtr.WithNtpFrac(0x40506);
  rtcp::Xr xr;
  xr.From(0x2345);
  xr.WithRrtr(&rrtr);

  rtcp::RawPacket p = xr.Build();
  EXPECT_EQ(0, InjectRtcpPacket(p.buffer(), p.buffer_length()));
  EXPECT_EQ(kRtcpXrReceiverReferenceTime,
            rtcp_packet_info_.rtcpPacketTypeFlags);
}

TEST_F(RtcpReceiverTest, XrDlrrPacketNotToUsIgnored) {
  const uint32_t kSourceSsrc = 0x123456;
  std::set<uint32_t> ssrcs;
  ssrcs.insert(kSourceSsrc);
  rtcp_receiver_->SetSsrcs(kSourceSsrc, ssrcs);

  rtcp::Dlrr dlrr;
  dlrr.WithDlrrItem(kSourceSsrc + 1, 0x12345, 0x67890);
  rtcp::Xr xr;
  xr.From(0x2345);
  xr.WithDlrr(&dlrr);
  rtcp::RawPacket p = xr.Build();
  EXPECT_EQ(0, InjectRtcpPacket(p.buffer(), p.buffer_length()));
  EXPECT_EQ(0U, rtcp_packet_info_.rtcpPacketTypeFlags);
  EXPECT_FALSE(rtcp_packet_info_.xr_dlrr_item);
}

TEST_F(RtcpReceiverTest, InjectXrDlrrPacketWithSubBlock) {
  const uint32_t kSourceSsrc = 0x123456;
  std::set<uint32_t> ssrcs;
  ssrcs.insert(kSourceSsrc);
  rtcp_receiver_->SetSsrcs(kSourceSsrc, ssrcs);

  rtcp::Dlrr dlrr;
  dlrr.WithDlrrItem(kSourceSsrc, 0x12345, 0x67890);
  rtcp::Xr xr;
  xr.From(0x2345);
  xr.WithDlrr(&dlrr);
  rtcp::RawPacket p = xr.Build();
  EXPECT_EQ(0, InjectRtcpPacket(p.buffer(), p.buffer_length()));
  // The parser should note the DLRR report block item, but not flag the packet
  // since the RTT is not estimated.
  EXPECT_TRUE(rtcp_packet_info_.xr_dlrr_item);
}

TEST_F(RtcpReceiverTest, InjectXrDlrrPacketWithMultipleSubBlocks) {
  const uint32_t kSourceSsrc = 0x123456;
  std::set<uint32_t> ssrcs;
  ssrcs.insert(kSourceSsrc);
  rtcp_receiver_->SetSsrcs(kSourceSsrc, ssrcs);

  rtcp::Dlrr dlrr;
  dlrr.WithDlrrItem(kSourceSsrc + 1, 0x12345, 0x67890);
  dlrr.WithDlrrItem(kSourceSsrc + 2, 0x12345, 0x67890);
  dlrr.WithDlrrItem(kSourceSsrc,     0x12345, 0x67890);
  rtcp::Xr xr;
  xr.From(0x2345);
  xr.WithDlrr(&dlrr);
  rtcp::RawPacket p = xr.Build();
  EXPECT_EQ(0, InjectRtcpPacket(p.buffer(), p.buffer_length()));
  // The parser should note the DLRR report block item, but not flag the packet
  // since the RTT is not estimated.
  EXPECT_TRUE(rtcp_packet_info_.xr_dlrr_item);
}

TEST_F(RtcpReceiverTest, InjectXrPacketWithMultipleReportBlocks) {
  const uint32_t kSourceSsrc = 0x123456;
  std::set<uint32_t> ssrcs;
  ssrcs.insert(kSourceSsrc);
  rtcp_receiver_->SetSsrcs(kSourceSsrc, ssrcs);

  rtcp::Rrtr rrtr;
  rtcp::Dlrr dlrr;
  dlrr.WithDlrrItem(kSourceSsrc, 0x12345, 0x67890);
  rtcp::VoipMetric metric;
  metric.To(kSourceSsrc);
  rtcp::Xr xr;
  xr.From(0x2345);
  xr.WithRrtr(&rrtr);
  xr.WithDlrr(&dlrr);
  xr.WithVoipMetric(&metric);
  rtcp::RawPacket p = xr.Build();
  EXPECT_EQ(0, InjectRtcpPacket(p.buffer(), p.buffer_length()));
  EXPECT_EQ(static_cast<unsigned int>(kRtcpXrReceiverReferenceTime +
                                      kRtcpXrVoipMetric),
            rtcp_packet_info_.rtcpPacketTypeFlags);
  // The parser should note the DLRR report block item, but not flag the packet
  // since the RTT is not estimated.
  EXPECT_TRUE(rtcp_packet_info_.xr_dlrr_item);
}

TEST_F(RtcpReceiverTest, InjectXrPacketWithUnknownReportBlock) {
  const uint32_t kSourceSsrc = 0x123456;
  std::set<uint32_t> ssrcs;
  ssrcs.insert(kSourceSsrc);
  rtcp_receiver_->SetSsrcs(kSourceSsrc, ssrcs);
  std::vector<uint32_t> remote_ssrcs;
  remote_ssrcs.push_back(kSourceSsrc);

  rtcp::Rrtr rrtr;
  rtcp::Dlrr dlrr;
  dlrr.WithDlrrItem(kSourceSsrc, 0x12345, 0x67890);
  rtcp::VoipMetric metric;
  metric.To(kSourceSsrc);
  rtcp::Xr xr;
  xr.From(0x2345);
  xr.WithRrtr(&rrtr);
  xr.WithDlrr(&dlrr);
  xr.WithVoipMetric(&metric);
  rtcp::RawPacket p = xr.Build();
  // Modify the DLRR block to have an unsupported block type, from 5 to 6.
  uint8_t* buffer = const_cast<uint8_t*>(p.buffer());
  EXPECT_EQ(5, buffer[20]);
  buffer[20] = 6;

  EXPECT_EQ(0, InjectRtcpPacket(p.buffer(), p.buffer_length()));
  EXPECT_EQ(static_cast<unsigned int>(kRtcpXrReceiverReferenceTime +
                                      kRtcpXrVoipMetric),
            rtcp_packet_info_.rtcpPacketTypeFlags);
  EXPECT_FALSE(rtcp_packet_info_.xr_dlrr_item);
}

TEST(RtcpUtilityTest, MidNtp) {
  const uint32_t kNtpSec = 0x12345678;
  const uint32_t kNtpFrac = 0x23456789;
  const uint32_t kNtpMid = 0x56782345;
  EXPECT_EQ(kNtpMid, RTCPUtility::MidNtp(kNtpSec, kNtpFrac));
}

TEST_F(RtcpReceiverTest, TestXrRrRttInitiallyFalse) {
  uint16_t rtt_ms;
  EXPECT_FALSE(rtcp_receiver_->GetAndResetXrRrRtt(&rtt_ms));
}

TEST_F(RtcpReceiverTest, LastReceivedXrReferenceTimeInfoInitiallyFalse) {
  RtcpReceiveTimeInfo info;
  EXPECT_FALSE(rtcp_receiver_->LastReceivedXrReferenceTimeInfo(&info));
}

TEST_F(RtcpReceiverTest, GetLastReceivedXrReferenceTimeInfo) {
  const uint32_t kSenderSsrc = 0x123456;
  const uint32_t kNtpSec = 0x10203;
  const uint32_t kNtpFrac = 0x40506;
  const uint32_t kNtpMid = RTCPUtility::MidNtp(kNtpSec, kNtpFrac);

  rtcp::Rrtr rrtr;
  rrtr.WithNtpSec(kNtpSec);
  rrtr.WithNtpFrac(kNtpFrac);
  rtcp::Xr xr;
  xr.From(kSenderSsrc);
  xr.WithRrtr(&rrtr);
  rtcp::RawPacket p = xr.Build();
  EXPECT_EQ(0, InjectRtcpPacket(p.buffer(), p.buffer_length()));
  EXPECT_EQ(kRtcpXrReceiverReferenceTime,
      rtcp_packet_info_.rtcpPacketTypeFlags);

  RtcpReceiveTimeInfo info;
  EXPECT_TRUE(rtcp_receiver_->LastReceivedXrReferenceTimeInfo(&info));
  EXPECT_EQ(kSenderSsrc, info.sourceSSRC);
  EXPECT_EQ(kNtpMid, info.lastRR);
  EXPECT_EQ(0U, info.delaySinceLastRR);

  system_clock_.AdvanceTimeMilliseconds(1000);
  EXPECT_TRUE(rtcp_receiver_->LastReceivedXrReferenceTimeInfo(&info));
  EXPECT_EQ(65536U, info.delaySinceLastRR);
}

TEST_F(RtcpReceiverTest, ReceiveReportTimeout) {
  const uint32_t kSenderSsrc = 0x10203;
  const uint32_t kSourceSsrc = 0x40506;
  const int64_t kRtcpIntervalMs = 1000;

  std::set<uint32_t> ssrcs;
  ssrcs.insert(kSourceSsrc);
  rtcp_receiver_->SetSsrcs(kSourceSsrc, ssrcs);

  const uint16_t kSequenceNumber = 1234;
  system_clock_.AdvanceTimeMilliseconds(3 * kRtcpIntervalMs);

  // No RR received, shouldn't trigger a timeout.
  EXPECT_FALSE(rtcp_receiver_->RtcpRrTimeout(kRtcpIntervalMs));
  EXPECT_FALSE(rtcp_receiver_->RtcpRrSequenceNumberTimeout(kRtcpIntervalMs));

  // Add a RR and advance the clock just enough to not trigger a timeout.
  rtcp::ReportBlock rb1;
  rb1.To(kSourceSsrc);
  rb1.WithExtHighestSeqNum(kSequenceNumber);
  rtcp::ReceiverReport rr1;
  rr1.From(kSenderSsrc);
  rr1.WithReportBlock(&rb1);
  rtcp::RawPacket p1 = rr1.Build();
  EXPECT_EQ(0, InjectRtcpPacket(p1.buffer(), p1.buffer_length()));
  system_clock_.AdvanceTimeMilliseconds(3 * kRtcpIntervalMs - 1);
  EXPECT_FALSE(rtcp_receiver_->RtcpRrTimeout(kRtcpIntervalMs));
  EXPECT_FALSE(rtcp_receiver_->RtcpRrSequenceNumberTimeout(kRtcpIntervalMs));

  // Add a RR with the same extended max as the previous RR to trigger a
  // sequence number timeout, but not a RR timeout.
  EXPECT_EQ(0, InjectRtcpPacket(p1.buffer(), p1.buffer_length()));
  system_clock_.AdvanceTimeMilliseconds(2);
  EXPECT_FALSE(rtcp_receiver_->RtcpRrTimeout(kRtcpIntervalMs));
  EXPECT_TRUE(rtcp_receiver_->RtcpRrSequenceNumberTimeout(kRtcpIntervalMs));

  // Advance clock enough to trigger an RR timeout too.
  system_clock_.AdvanceTimeMilliseconds(3 * kRtcpIntervalMs);
  EXPECT_TRUE(rtcp_receiver_->RtcpRrTimeout(kRtcpIntervalMs));

  // We should only get one timeout even though we still haven't received a new
  // RR.
  EXPECT_FALSE(rtcp_receiver_->RtcpRrTimeout(kRtcpIntervalMs));
  EXPECT_FALSE(rtcp_receiver_->RtcpRrSequenceNumberTimeout(kRtcpIntervalMs));

  // Add a new RR with increase sequence number to reset timers.
  rtcp::ReportBlock rb2;
  rb2.To(kSourceSsrc);
  rb2.WithExtHighestSeqNum(kSequenceNumber + 1);
  rtcp::ReceiverReport rr2;
  rr2.From(kSenderSsrc);
  rr2.WithReportBlock(&rb2);
  rtcp::RawPacket p2 = rr2.Build();
  EXPECT_EQ(0, InjectRtcpPacket(p2.buffer(), p2.buffer_length()));
  EXPECT_FALSE(rtcp_receiver_->RtcpRrTimeout(kRtcpIntervalMs));
  EXPECT_FALSE(rtcp_receiver_->RtcpRrSequenceNumberTimeout(kRtcpIntervalMs));

  // Verify we can get a timeout again once we've received new RR.
  system_clock_.AdvanceTimeMilliseconds(2 * kRtcpIntervalMs);
  EXPECT_EQ(0, InjectRtcpPacket(p2.buffer(), p2.buffer_length()));
  system_clock_.AdvanceTimeMilliseconds(kRtcpIntervalMs + 1);
  EXPECT_FALSE(rtcp_receiver_->RtcpRrTimeout(kRtcpIntervalMs));
  EXPECT_TRUE(rtcp_receiver_->RtcpRrSequenceNumberTimeout(kRtcpIntervalMs));
  system_clock_.AdvanceTimeMilliseconds(2 * kRtcpIntervalMs);
  EXPECT_TRUE(rtcp_receiver_->RtcpRrTimeout(kRtcpIntervalMs));
}

TEST_F(RtcpReceiverTest, TmmbrReceivedWithNoIncomingPacket) {
  // This call is expected to fail because no data has arrived.
  EXPECT_EQ(-1, rtcp_receiver_->TMMBRReceived(0, 0, NULL));
}

TEST_F(RtcpReceiverTest, TwoReportBlocks) {
  const uint32_t kSenderSsrc = 0x10203;
  const uint32_t kSourceSsrcs[] = {0x40506, 0x50607};
  const uint16_t kSequenceNumbers[] = {10, 12423};
  const int kNumSsrcs = sizeof(kSourceSsrcs) / sizeof(kSourceSsrcs[0]);

  std::set<uint32_t> ssrcs(kSourceSsrcs, kSourceSsrcs + kNumSsrcs);
  rtcp_receiver_->SetSsrcs(kSourceSsrcs[0], ssrcs);

  rtcp::ReportBlock rb1;
  rb1.To(kSourceSsrcs[0]);
  rb1.WithExtHighestSeqNum(kSequenceNumbers[0]);
  rb1.WithFractionLost(10);
  rb1.WithCumulativeLost(5);

  rtcp::ReportBlock rb2;
  rb2.To(kSourceSsrcs[1]);
  rb2.WithExtHighestSeqNum(kSequenceNumbers[1]);

  rtcp::ReceiverReport rr1;
  rr1.From(kSenderSsrc);
  rr1.WithReportBlock(&rb1);
  rr1.WithReportBlock(&rb2);

  rtcp::RawPacket p1 = rr1.Build();
  EXPECT_EQ(0, InjectRtcpPacket(p1.buffer(), p1.buffer_length()));
  ASSERT_EQ(2u, rtcp_packet_info_.report_blocks.size());
  EXPECT_EQ(10, rtcp_packet_info_.report_blocks.front().fractionLost);
  EXPECT_EQ(0, rtcp_packet_info_.report_blocks.back().fractionLost);

  rtcp::ReportBlock rb3;
  rb3.To(kSourceSsrcs[0]);
  rb3.WithExtHighestSeqNum(kSequenceNumbers[0]);

  rtcp::ReportBlock rb4;
  rb4.To(kSourceSsrcs[1]);
  rb4.WithExtHighestSeqNum(kSequenceNumbers[1]);
  rb4.WithFractionLost(20);
  rb4.WithCumulativeLost(10);

  rtcp::ReceiverReport rr2;
  rr2.From(kSenderSsrc);
  rr2.WithReportBlock(&rb3);
  rr2.WithReportBlock(&rb4);

  rtcp::RawPacket p2 = rr2.Build();
  EXPECT_EQ(0, InjectRtcpPacket(p2.buffer(), p2.buffer_length()));
  ASSERT_EQ(2u, rtcp_packet_info_.report_blocks.size());
  EXPECT_EQ(0, rtcp_packet_info_.report_blocks.front().fractionLost);
  EXPECT_EQ(20, rtcp_packet_info_.report_blocks.back().fractionLost);
}

TEST_F(RtcpReceiverTest, TmmbrPacketAccepted) {
  const uint32_t kMediaFlowSsrc = 0x2040608;
  const uint32_t kSenderSsrc = 0x10203;
  std::set<uint32_t> ssrcs;
  ssrcs.insert(kMediaFlowSsrc);  // Matches "media source" above.
  rtcp_receiver_->SetSsrcs(kMediaFlowSsrc, ssrcs);

  rtcp::Tmmbr tmmbr;
  tmmbr.From(kSenderSsrc);
  tmmbr.To(kMediaFlowSsrc);
  tmmbr.WithBitrateKbps(30);

  rtcp::SenderReport sr;
  sr.From(kSenderSsrc);
  sr.Append(&tmmbr);
  rtcp::RawPacket p = sr.Build();
  EXPECT_EQ(0, InjectRtcpPacket(p.buffer(), p.buffer_length()));

  EXPECT_EQ(1, rtcp_receiver_->TMMBRReceived(0, 0, NULL));
  TMMBRSet candidate_set;
  candidate_set.VerifyAndAllocateSet(1);
  EXPECT_EQ(1, rtcp_receiver_->TMMBRReceived(1, 0, &candidate_set));
  EXPECT_LT(0U, candidate_set.Tmmbr(0));
  EXPECT_EQ(kSenderSsrc, candidate_set.Ssrc(0));
}

TEST_F(RtcpReceiverTest, TmmbrPacketNotForUsIgnored) {
  const uint32_t kMediaFlowSsrc = 0x2040608;
  const uint32_t kSenderSsrc = 0x10203;

  rtcp::Tmmbr tmmbr;
  tmmbr.From(kSenderSsrc);
  tmmbr.To(kMediaFlowSsrc + 1);  // This SSRC is not what we are sending.
  tmmbr.WithBitrateKbps(30);

  rtcp::SenderReport sr;
  sr.From(kSenderSsrc);
  sr.Append(&tmmbr);
  rtcp::RawPacket p = sr.Build();

  std::set<uint32_t> ssrcs;
  ssrcs.insert(kMediaFlowSsrc);
  rtcp_receiver_->SetSsrcs(kMediaFlowSsrc, ssrcs);
  EXPECT_EQ(0, InjectRtcpPacket(p.buffer(), p.buffer_length()));
  EXPECT_EQ(0, rtcp_receiver_->TMMBRReceived(0, 0, NULL));
}

TEST_F(RtcpReceiverTest, TmmbrPacketZeroRateIgnored) {
  const uint32_t kMediaFlowSsrc = 0x2040608;
  const uint32_t kSenderSsrc = 0x10203;
  std::set<uint32_t> ssrcs;
  ssrcs.insert(kMediaFlowSsrc);  // Matches "media source" above.
  rtcp_receiver_->SetSsrcs(kMediaFlowSsrc, ssrcs);

  rtcp::Tmmbr tmmbr;
  tmmbr.From(kSenderSsrc);
  tmmbr.To(kMediaFlowSsrc);
  tmmbr.WithBitrateKbps(0);

  rtcp::SenderReport sr;
  sr.From(kSenderSsrc);
  sr.Append(&tmmbr);
  rtcp::RawPacket p = sr.Build();

  EXPECT_EQ(0, InjectRtcpPacket(p.buffer(), p.buffer_length()));
  EXPECT_EQ(0, rtcp_receiver_->TMMBRReceived(0, 0, NULL));
}

TEST_F(RtcpReceiverTest, TmmbrThreeConstraintsTimeOut) {
  const uint32_t kMediaFlowSsrc = 0x2040608;
  const uint32_t kSenderSsrc = 0x10203;
  std::set<uint32_t> ssrcs;
  ssrcs.insert(kMediaFlowSsrc);  // Matches "media source" above.
  rtcp_receiver_->SetSsrcs(kMediaFlowSsrc, ssrcs);

  // Inject 3 packets "from" kSenderSsrc, kSenderSsrc+1, kSenderSsrc+2.
  // The times of arrival are starttime + 0, starttime + 5 and starttime + 10.
  for (uint32_t ssrc = kSenderSsrc; ssrc < kSenderSsrc + 3; ++ssrc) {
    rtcp::Tmmbr tmmbr;
    tmmbr.From(ssrc);
    tmmbr.To(kMediaFlowSsrc);
    tmmbr.WithBitrateKbps(30);

    rtcp::SenderReport sr;
    sr.From(ssrc);
    sr.Append(&tmmbr);
    rtcp::RawPacket p = sr.Build();
    EXPECT_EQ(0, InjectRtcpPacket(p.buffer(), p.buffer_length()));
    // 5 seconds between each packet.
    system_clock_.AdvanceTimeMilliseconds(5000);
  }
  // It is now starttime + 15.
  EXPECT_EQ(3, rtcp_receiver_->TMMBRReceived(0, 0, NULL));
  TMMBRSet candidate_set;
  candidate_set.VerifyAndAllocateSet(3);
  EXPECT_EQ(3, rtcp_receiver_->TMMBRReceived(3, 0, &candidate_set));
  EXPECT_LT(0U, candidate_set.Tmmbr(0));
  // We expect the timeout to be 25 seconds. Advance the clock by 12
  // seconds, timing out the first packet.
  system_clock_.AdvanceTimeMilliseconds(12000);
  // Odd behaviour: Just counting them does not trigger the timeout.
  EXPECT_EQ(3, rtcp_receiver_->TMMBRReceived(0, 0, NULL));
  EXPECT_EQ(2, rtcp_receiver_->TMMBRReceived(3, 0, &candidate_set));
  EXPECT_EQ(kSenderSsrc + 1, candidate_set.Ssrc(0));
}

TEST_F(RtcpReceiverTest, Callbacks) {
  class RtcpCallbackImpl : public RtcpStatisticsCallback {
   public:
    RtcpCallbackImpl() : RtcpStatisticsCallback(), ssrc_(0) {}
    virtual ~RtcpCallbackImpl() {}

    virtual void StatisticsUpdated(const RtcpStatistics& statistics,
                                   uint32_t ssrc) {
      stats_ = statistics;
      ssrc_ = ssrc;
    }

    bool Matches(uint32_t ssrc, uint32_t extended_max, uint8_t fraction_loss,
                 uint32_t cumulative_loss, uint32_t jitter) {
      return ssrc_ == ssrc &&
          stats_.fraction_lost == fraction_loss &&
          stats_.cumulative_lost == cumulative_loss &&
          stats_.extended_max_sequence_number == extended_max &&
          stats_.jitter == jitter;
    }

    RtcpStatistics stats_;
    uint32_t ssrc_;
  } callback;

  rtcp_receiver_->RegisterRtcpStatisticsCallback(&callback);

  const uint32_t kSenderSsrc = 0x10203;
  const uint32_t kSourceSsrc = 0x123456;
  const uint8_t kFractionLoss = 3;
  const uint32_t kCumulativeLoss = 7;
  const uint32_t kJitter = 9;
  const uint16_t kSequenceNumber = 1234;

  std::set<uint32_t> ssrcs;
  ssrcs.insert(kSourceSsrc);
  rtcp_receiver_->SetSsrcs(kSourceSsrc, ssrcs);

  // First packet, all numbers should just propagate.
  rtcp::ReportBlock rb1;
  rb1.To(kSourceSsrc);
  rb1.WithExtHighestSeqNum(kSequenceNumber);
  rb1.WithFractionLost(kFractionLoss);
  rb1.WithCumulativeLost(kCumulativeLoss);
  rb1.WithJitter(kJitter);

  rtcp::ReceiverReport rr1;
  rr1.From(kSenderSsrc);
  rr1.WithReportBlock(&rb1);
  rtcp::RawPacket p1 = rr1.Build();
  EXPECT_EQ(0, InjectRtcpPacket(p1.buffer(), p1.buffer_length()));
  EXPECT_TRUE(callback.Matches(kSourceSsrc, kSequenceNumber, kFractionLoss,
                               kCumulativeLoss, kJitter));

  rtcp_receiver_->RegisterRtcpStatisticsCallback(NULL);

  // Add arbitrary numbers, callback should not be called (retain old values).
  rtcp::ReportBlock rb2;
  rb2.To(kSourceSsrc);
  rb2.WithExtHighestSeqNum(kSequenceNumber + 1);
  rb2.WithFractionLost(42);
  rb2.WithCumulativeLost(137);
  rb2.WithJitter(4711);

  rtcp::ReceiverReport rr2;
  rr2.From(kSenderSsrc);
  rr2.WithReportBlock(&rb2);
  rtcp::RawPacket p2 = rr2.Build();
  EXPECT_EQ(0, InjectRtcpPacket(p2.buffer(), p2.buffer_length()));
  EXPECT_TRUE(callback.Matches(kSourceSsrc, kSequenceNumber, kFractionLoss,
                               kCumulativeLoss, kJitter));
}

}  // Anonymous namespace

}  // namespace webrtc