Add RemoteEstimatorProxy for capturing receive times

webrtc/modules/remote_bitrate_estimator/remote_estimator_proxy_unittest.cc

Index: webrtc/modules/remote_bitrate_estimator/remote_estimator_proxy_unittest.cc
diff --git a/webrtc/modules/remote_bitrate_estimator/remote_estimator_proxy_unittest.cc b/webrtc/modules/remote_bitrate_estimator/remote_estimator_proxy_unittest.cc
new file mode 100644
index 0000000000000000000000000000000000000000..5ebd921e7a5324d8cb44fe58a5129fe94d8c0098
--- /dev/null
+++ b/webrtc/modules/remote_bitrate_estimator/remote_estimator_proxy_unittest.cc
@@ -0,0 +1,272 @@
+/*
+ *  Copyright (c) 2015 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.
+ */
+
+#include "testing/gmock/include/gmock/gmock.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+#include "webrtc/modules/pacing/include/packet_router.h"
+#include "webrtc/modules/remote_bitrate_estimator/remote_estimator_proxy.h"
+#include "webrtc/modules/rtp_rtcp/source/rtcp_packet/transport_feedback.h"
+#include "webrtc/system_wrappers/interface/clock.h"
+
+using ::testing::_;
+using ::testing::InSequence;
+using ::testing::Invoke;
+
+namespace webrtc {
+
+class MockPacketRouter : public PacketRouter {
+ public:
+  MOCK_METHOD1(SendFeedback, bool(rtcp::TransportFeedback* packet));
+};
+
+class RemoteEstimatorProxyTest : public ::testing::Test {
+ public:
+  RemoteEstimatorProxyTest() : clock_(0), proxy_(&clock_, &router_) {}
+
+ protected:
+  void IncomingPacket(uint16_t seq, int64_t time_ms) {
+    RTPHeader header;
+    header.extension.hasTransportSequenceNumber = true;
+    header.extension.transportSequenceNumber = seq;
+    header.ssrc = kMediaSsrc;
+    proxy_.IncomingPacket(time_ms, kDefaultPacketSize, header, true);
+  }
+
+  void Process() {
+    clock_.AdvanceTimeMilliseconds(
+        RemoteEstimatorProxy::kDefaultProcessIntervalMs);
+    proxy_.Process();
+  }
+
+  SimulatedClock clock_;
+  MockPacketRouter router_;
+  RemoteEstimatorProxy proxy_;
+
+  const size_t kDefaultPacketSize = 100;
+  const uint32_t kMediaSsrc = 456;
+  const uint16_t kBaseSeq = 10;
+  const int64_t kBaseTimeMs = 123;
+  const int64_t kMaxSmallDeltaMs =
+      (rtcp::TransportFeedback::kDeltaScaleFactor * 0xFF) / 1000;
+};
+
+TEST_F(RemoteEstimatorProxyTest, SendsSinglePacketFeedback) {
+  IncomingPacket(kBaseSeq, kBaseTimeMs);
+
+  EXPECT_CALL(router_, SendFeedback(_))
+      .Times(1)
+      .WillOnce(Invoke([this](rtcp::TransportFeedback* packet) {
+        packet->Build();
+        EXPECT_EQ(kBaseSeq, packet->GetBaseSequence());
+        EXPECT_EQ(kMediaSsrc, packet->GetMediaSourceSsrc());
+
+        std::vector<rtcp::TransportFeedback::StatusSymbol> status_vec =
+            packet->GetStatusVector();
+        EXPECT_EQ(1u, status_vec.size());
+        EXPECT_EQ(rtcp::TransportFeedback::StatusSymbol::kReceivedSmallDelta,
+                  status_vec[0]);
+        std::vector<int64_t> delta_vec = packet->GetReceiveDeltasUs();
+        EXPECT_EQ(1u, delta_vec.size());
+        EXPECT_EQ(kBaseTimeMs, (packet->GetBaseTimeUs() + delta_vec[0]) / 1000);
+        return true;
+      }));
+
+  Process();
+}
+
+TEST_F(RemoteEstimatorProxyTest, SendsFeedbackWithVaryingDeltas) {
+  IncomingPacket(kBaseSeq, kBaseTimeMs);
+  IncomingPacket(kBaseSeq + 1, kBaseTimeMs + kMaxSmallDeltaMs);
+  IncomingPacket(kBaseSeq + 2, kBaseTimeMs + (2 * kMaxSmallDeltaMs) + 1);
+
+  EXPECT_CALL(router_, SendFeedback(_))
+      .Times(1)
+      .WillOnce(Invoke([this](rtcp::TransportFeedback* packet) {
+        packet->Build();
+        EXPECT_EQ(kBaseSeq, packet->GetBaseSequence());
+        EXPECT_EQ(kMediaSsrc, packet->GetMediaSourceSsrc());
+
+        std::vector<rtcp::TransportFeedback::StatusSymbol> status_vec =
+            packet->GetStatusVector();
+        EXPECT_EQ(3u, status_vec.size());
+        EXPECT_EQ(rtcp::TransportFeedback::StatusSymbol::kReceivedSmallDelta,
+                  status_vec[0]);
+        EXPECT_EQ(rtcp::TransportFeedback::StatusSymbol::kReceivedSmallDelta,
+                  status_vec[1]);
+        EXPECT_EQ(rtcp::TransportFeedback::StatusSymbol::kReceivedLargeDelta,
+                  status_vec[2]);
+
+        std::vector<int64_t> delta_vec = packet->GetReceiveDeltasUs();
+        EXPECT_EQ(3u, delta_vec.size());
+        EXPECT_EQ(kBaseTimeMs, (packet->GetBaseTimeUs() + delta_vec[0]) / 1000);
+        EXPECT_EQ(kMaxSmallDeltaMs, delta_vec[1] / 1000);
+        EXPECT_EQ(kMaxSmallDeltaMs + 1, delta_vec[2] / 1000);
+        return true;
+      }));
+
+  Process();
+}
+
+TEST_F(RemoteEstimatorProxyTest, SendsFragmentedFeedback) {
+  const int64_t kTooLargeDelta =
+      rtcp::TransportFeedback::kDeltaScaleFactor * (1 << 16);
+
+  IncomingPacket(kBaseSeq, kBaseTimeMs);
+  IncomingPacket(kBaseSeq + 1, kBaseTimeMs + kTooLargeDelta);
+
+  InSequence s;
+  EXPECT_CALL(router_, SendFeedback(_))
+      .Times(1)
+      .WillOnce(Invoke([kTooLargeDelta, this](rtcp::TransportFeedback* packet) {
+        packet->Build();
+        EXPECT_EQ(kBaseSeq, packet->GetBaseSequence());
+        EXPECT_EQ(kMediaSsrc, packet->GetMediaSourceSsrc());
+
+        std::vector<rtcp::TransportFeedback::StatusSymbol> status_vec =
+            packet->GetStatusVector();
+        EXPECT_EQ(1u, status_vec.size());
+        EXPECT_EQ(rtcp::TransportFeedback::StatusSymbol::kReceivedSmallDelta,
+                  status_vec[0]);
+        std::vector<int64_t> delta_vec = packet->GetReceiveDeltasUs();
+        EXPECT_EQ(1u, delta_vec.size());
+        EXPECT_EQ(kBaseTimeMs, (packet->GetBaseTimeUs() + delta_vec[0]) / 1000);
+        return true;
+      }))
+      .RetiresOnSaturation();
+
+  EXPECT_CALL(router_, SendFeedback(_))
+      .Times(1)
+      .WillOnce(Invoke([kTooLargeDelta, this](rtcp::TransportFeedback* packet) {
+        packet->Build();
+        EXPECT_EQ(kBaseSeq + 1, packet->GetBaseSequence());
+        EXPECT_EQ(kMediaSsrc, packet->GetMediaSourceSsrc());
+
+        std::vector<rtcp::TransportFeedback::StatusSymbol> status_vec =
+            packet->GetStatusVector();
+        EXPECT_EQ(1u, status_vec.size());
+        EXPECT_EQ(rtcp::TransportFeedback::StatusSymbol::kReceivedSmallDelta,
+                  status_vec[0]);
+        std::vector<int64_t> delta_vec = packet->GetReceiveDeltasUs();
+        EXPECT_EQ(1u, delta_vec.size());
+        EXPECT_EQ(kBaseTimeMs + kTooLargeDelta,
+                  (packet->GetBaseTimeUs() + delta_vec[0]) / 1000);
+        return true;
+      }))
+      .RetiresOnSaturation();
+
+  Process();
+}
+
+TEST_F(RemoteEstimatorProxyTest, ResendsTimestampsOnReordering) {
+  IncomingPacket(kBaseSeq, kBaseTimeMs);
+  IncomingPacket(kBaseSeq + 2, kBaseTimeMs + 2);
+
+  EXPECT_CALL(router_, SendFeedback(_))
+      .Times(1)
+      .WillOnce(Invoke([this](rtcp::TransportFeedback* packet) {
+        packet->Build();
+        EXPECT_EQ(kBaseSeq, packet->GetBaseSequence());
+        EXPECT_EQ(kMediaSsrc, packet->GetMediaSourceSsrc());
+
+        std::vector<int64_t> delta_vec = packet->GetReceiveDeltasUs();
+        EXPECT_EQ(2u, delta_vec.size());
+        EXPECT_EQ(kBaseTimeMs, (packet->GetBaseTimeUs() + delta_vec[0]) / 1000);
+        EXPECT_EQ(2, delta_vec[1] / 1000);
+        return true;
+      }));
+
+  Process();
+
+  IncomingPacket(kBaseSeq + 1, kBaseTimeMs + 1);
+
+  EXPECT_CALL(router_, SendFeedback(_))
+      .Times(1)
+      .WillOnce(Invoke([this](rtcp::TransportFeedback* packet) {
+        packet->Build();
+        EXPECT_EQ(kBaseSeq + 1, packet->GetBaseSequence());
+        EXPECT_EQ(kMediaSsrc, packet->GetMediaSourceSsrc());
+
+        std::vector<int64_t> delta_vec = packet->GetReceiveDeltasUs();
+        EXPECT_EQ(2u, delta_vec.size());
+        EXPECT_EQ(kBaseTimeMs + 1,
+                  (packet->GetBaseTimeUs() + delta_vec[0]) / 1000);
+        EXPECT_EQ(1, delta_vec[1] / 1000);
+        return true;
+      }));
+
+  Process();
+}
+
+TEST_F(RemoteEstimatorProxyTest, RemovesTimestampsOutOfScope) {
+  const int64_t kTimeoutTimeMs =
+      kBaseTimeMs + RemoteEstimatorProxy::kBackWindowMs;
+
+  IncomingPacket(kBaseSeq + 2, kBaseTimeMs);
+
+  EXPECT_CALL(router_, SendFeedback(_))
+      .Times(1)
+      .WillOnce(Invoke([kTimeoutTimeMs, this](rtcp::TransportFeedback* packet) {
+        packet->Build();
+        EXPECT_EQ(kBaseSeq + 2, packet->GetBaseSequence());
+
+        std::vector<int64_t> delta_vec = packet->GetReceiveDeltasUs();
+        EXPECT_EQ(1u, delta_vec.size());
+        EXPECT_EQ(kBaseTimeMs, (packet->GetBaseTimeUs() + delta_vec[0]) / 1000);
+        return true;
+      }));
+
+  Process();
+
+  IncomingPacket(kBaseSeq + 3, kTimeoutTimeMs);  // kBaseSeq + 2 times out here.
+
+  EXPECT_CALL(router_, SendFeedback(_))
+      .Times(1)
+      .WillOnce(Invoke([kTimeoutTimeMs, this](rtcp::TransportFeedback* packet) {
+        packet->Build();
+        EXPECT_EQ(kBaseSeq + 3, packet->GetBaseSequence());
+
+        std::vector<int64_t> delta_vec = packet->GetReceiveDeltasUs();
+        EXPECT_EQ(1u, delta_vec.size());
+        EXPECT_EQ(kTimeoutTimeMs,
+                  (packet->GetBaseTimeUs() + delta_vec[0]) / 1000);
+        return true;
+      }));
+
+  Process();
+
+  // New group, with sequence starting below the first so that they may be
+  // retransmitted.
+  IncomingPacket(kBaseSeq, kBaseTimeMs - 1);
+  IncomingPacket(kBaseSeq + 1, kTimeoutTimeMs - 1);
+
+  EXPECT_CALL(router_, SendFeedback(_))
+      .Times(1)
+      .WillOnce(Invoke([kTimeoutTimeMs, this](rtcp::TransportFeedback* packet) {
+        packet->Build();
+        EXPECT_EQ(kBaseSeq, packet->GetBaseSequence());
+
+        // Four status entries (kBaseSeq + 3 missing).
+        EXPECT_EQ(4u, packet->GetStatusVector().size());
+
+        // Only three actual timestamps.
+        std::vector<int64_t> delta_vec = packet->GetReceiveDeltasUs();
+        EXPECT_EQ(3u, delta_vec.size());
+        EXPECT_EQ(kBaseTimeMs - 1,
+                  (packet->GetBaseTimeUs() + delta_vec[0]) / 1000);
+        EXPECT_EQ(kTimeoutTimeMs - kBaseTimeMs, delta_vec[1] / 1000);
+        EXPECT_EQ(1, delta_vec[2] / 1000);
+        return true;
+      }));
+
+  Process();
+}
+
+}  // namespace webrtc