Use bayesian estimate of acked bitrate.

webrtc/modules/congestion_controller/delay_based_bwe_unittest_helper.cc

 /*
  *  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.
  */
 #include "webrtc/modules/congestion_controller/delay_based_bwe_unittest_helper.h"
@@ skipping 135 matching lines @@
   it = std::min_element(streams_.begin(), streams_.end(), RtpStream::Compare);
   return std::max((*it)->next_rtp_time(), time_now_us);
 }
 }  // namespace test
 
 DelayBasedBweTest::DelayBasedBweTest()
     : clock_(100000000),
       bitrate_estimator_(&clock_),
       stream_generator_(new test::StreamGenerator(1e6,  // Capacity.
                                                   clock_.TimeInMicroseconds())),
-      arrival_time_offset_ms_(0) {}
+      arrival_time_offset_ms_(0),
+      first_update_(true) {}
 
 DelayBasedBweTest::~DelayBasedBweTest() {}
 
 void DelayBasedBweTest::AddDefaultStream() {
   stream_generator_->AddStream(new test::RtpStream(30, 3e5));
 }
 
 const uint32_t DelayBasedBweTest::kDefaultSsrc = 0;
 
 void DelayBasedBweTest::IncomingFeedback(int64_t arrival_time_ms,
@@ skipping 45 matching lines @@
   for (auto& packet : packets) {
     RTC_CHECK_GE(packet.arrival_time_ms + arrival_time_offset_ms_, 0);
     packet.arrival_time_ms += arrival_time_offset_ms_;
   }
   DelayBasedBwe::Result result =
       bitrate_estimator_.IncomingPacketFeedbackVector(packets);
   const uint32_t kDummySsrc = 0;
   if (result.updated) {
     bitrate_observer_.OnReceiveBitrateChanged({kDummySsrc},
                                               result.target_bitrate_bps);
-    if (result.target_bitrate_bps < bitrate_bps)
+    if (!first_update_ && result.target_bitrate_bps < bitrate_bps)
       overuse = true;
+    first_update_ = false;
   }
 
   clock_.AdvanceTimeMicroseconds(next_time_us - clock_.TimeInMicroseconds());
   return overuse;
 }
 
 // Run the bandwidth estimator with a stream of |number_of_frames| frames, or
 // until it reaches |target_bitrate|.
 // Can for instance be used to run the estimator for some time to get it
 // into a steady state.
@@ skipping 123 matching lines @@
     bool overuse = GenerateAndProcessFrame(kDefaultSsrc, bitrate_bps);
     if (overuse) {
       EXPECT_GT(bitrate_observer_.latest_bitrate(), bitrate_bps);
       bitrate_bps = bitrate_observer_.latest_bitrate();
       bitrate_observer_.Reset();
     } else if (bitrate_observer_.updated()) {
       bitrate_bps = bitrate_observer_.latest_bitrate();
       bitrate_observer_.Reset();
     }
     ++iterations;
-    // ASSERT_LE(iterations, expected_iterations);
   }
   ASSERT_EQ(expected_iterations, iterations);
 }
 
 void DelayBasedBweTest::CapacityDropTestHelper(
     int number_of_streams,
     bool wrap_time_stamp,
     uint32_t expected_bitrate_drop_delta,
     int64_t receiver_clock_offset_change_ms) {
   const int kFramerate = 30;
@@ skipping 103 matching lines @@
     clock_.AdvanceTimeMilliseconds(kFrameIntervalMs);
     send_time_ms += kFrameIntervalMs;
   }
   uint32_t bitrate_before = 0;
   std::vector<uint32_t> ssrcs;
   bitrate_estimator_.LatestEstimate(&ssrcs, &bitrate_before);
 
   clock_.AdvanceTimeMilliseconds(silence_time_s * 1000);
   send_time_ms += silence_time_s * 1000;
 
-  for (size_t i = 0; i < 21; ++i) {
+  for (size_t i = 0; i < 22; ++i) {
     IncomingFeedback(clock_.TimeInMilliseconds(), send_time_ms,
                      sequence_number++, 1000);
     clock_.AdvanceTimeMilliseconds(2 * kFrameIntervalMs);
     send_time_ms += kFrameIntervalMs;
   }
   uint32_t bitrate_after = 0;
   bitrate_estimator_.LatestEstimate(&ssrcs, &bitrate_after);
   EXPECT_LT(bitrate_after, bitrate_before);
 }
 }  // namespace webrtc