Remove GetFeedbackInterval in sender side BWE.

webrtc/modules/congestion_controller/delay_based_bwe.cc

Index: webrtc/modules/congestion_controller/delay_based_bwe.cc
diff --git a/webrtc/modules/congestion_controller/delay_based_bwe.cc b/webrtc/modules/congestion_controller/delay_based_bwe.cc
index 7a20b3eedb4fea1556931d8935c5218591a71a8d..7adf97349010dd3ccbb25ba7913d6e0fc5279920 100644
--- a/webrtc/modules/congestion_controller/delay_based_bwe.cc
+++ b/webrtc/modules/congestion_controller/delay_based_bwe.cc
@@ -131,15 +131,21 @@ DelayBasedBwe::BitrateEstimator::BitrateEstimator()
       bitrate_estimate_(-1.0f),
       bitrate_estimate_var_(50.0f),
       old_estimator_(kBitrateWindowMs, 8000),
-      in_experiment_(BitrateEstimateExperimentIsEnabled()) {}
+      in_experiment_(BitrateEstimateExperimentIsEnabled()),
+      last_result_was_valid_(false) {}
 
 void DelayBasedBwe::BitrateEstimator::Update(int64_t now_ms, int bytes) {
   if (!in_experiment_) {
     old_estimator_.Update(bytes, now_ms);
     rtc::Optional<uint32_t> rate = old_estimator_.Rate(now_ms);
     bitrate_estimate_ = -1.0f;
-    if (rate)
+    if (rate) {
       bitrate_estimate_ = *rate / 1000.0f;
+      last_result_was_valid_ = true;
+    } else if (last_result_was_valid_) {
+      old_estimator_.Reset();
+      last_result_was_valid_ = false;
+    }
     return;
   }
   int rate_window_ms = kRateWindowMs;
@@ -215,7 +221,6 @@ DelayBasedBwe::DelayBasedBwe(Clock* clock)
       trendline_estimator_(),
       detector_(),
       receiver_incoming_bitrate_(),
-      last_update_ms_(-1),
       last_seen_packet_ms_(-1),
       uma_recorded_(false),
       trendline_window_size_(kDefaultTrendlineWindowSize),
@@ -246,17 +251,15 @@ DelayBasedBwe::Result DelayBasedBwe::IncomingPacketFeedbackVector(
                               BweNames::kBweNamesMax);
     uma_recorded_ = true;
   }
-  Result aggregated_result;
+  bool overusing = false;
   for (const auto& packet_info : packet_feedback_vector) {
-    Result result = IncomingPacketInfo(packet_info);
-    if (result.updated)
-      aggregated_result = result;
+    IncomingPacketInfo(packet_info);
+    overusing |= detector_.State() == kBwOverusing;
   }
-  return aggregated_result;
+  return MaybeUpdateEstimate(overusing);
 }
 
-DelayBasedBwe::Result DelayBasedBwe::IncomingPacketInfo(
-    const PacketInfo& info) {
+void DelayBasedBwe::IncomingPacketInfo(const PacketInfo& info) {
   int64_t now_ms = clock_->TimeInMilliseconds();
 
   receiver_incoming_bitrate_.Update(info.arrival_time_ms, info.payload_size);
@@ -313,53 +316,48 @@ DelayBasedBwe::Result DelayBasedBwe::IncomingPacketInfo(
     }
   }
 
-  int probing_bps = 0;
   if (info.probe_cluster_id != PacketInfo::kNotAProbe) {
-    probing_bps = probe_bitrate_estimator_.HandleProbeAndEstimateBitrate(info);
+    probe_bitrate_estimator_.HandleProbeAndEstimateBitrate(info);
   }
+}
+
+DelayBasedBwe::Result DelayBasedBwe::MaybeUpdateEstimate(bool overusing) {
+  Result result;
   rtc::Optional<uint32_t> acked_bitrate_bps =
       receiver_incoming_bitrate_.bitrate_bps();
+  int64_t now_ms = clock_->TimeInMilliseconds();
+  rtc::Optional<int> porbe_bitrate_bps =

[stefan-webrtc, 2017/03/28 08:38:28]

probe_bitrate_bps

[michaelt, 2017/03/28 09:59:13]

Done.

+      probe_bitrate_estimator_.FetchLastEstimatedBitrateBps();
   // Currently overusing the bandwidth.
-  if (detector_.State() == kBwOverusing) {
+  if (overusing) {
     if (acked_bitrate_bps &&
         rate_control_.TimeToReduceFurther(now_ms, *acked_bitrate_bps)) {
       result.updated =
-          UpdateEstimate(info.arrival_time_ms, now_ms, acked_bitrate_bps,
-                         &result.target_bitrate_bps);
+          UpdateEstimate(now_ms, acked_bitrate_bps, overusing, &result);
+    }
+  } else {
+    if (porbe_bitrate_bps) {
+      rate_control_.SetEstimate(*porbe_bitrate_bps, now_ms);
+      result.probe = true;
     }
-  } else if (probing_bps > 0) {
-    // No overuse, but probing measured a bitrate.
-    rate_control_.SetEstimate(probing_bps, info.arrival_time_ms);
-    result.probe = true;
-    result.updated =
-        UpdateEstimate(info.arrival_time_ms, now_ms, acked_bitrate_bps,
-                       &result.target_bitrate_bps);
-  }
-  if (!result.updated &&
-      (last_update_ms_ == -1 ||
-       now_ms - last_update_ms_ > rate_control_.GetFeedbackInterval())) {
     result.updated =
-        UpdateEstimate(info.arrival_time_ms, now_ms, acked_bitrate_bps,
-                       &result.target_bitrate_bps);
+        UpdateEstimate(now_ms, acked_bitrate_bps, overusing, &result);
   }
-  if (result.updated) {
-    last_update_ms_ = now_ms;
-    BWE_TEST_LOGGING_PLOT(1, "target_bitrate_bps", now_ms,
-                          result.target_bitrate_bps);
-  }
-
   return result;
 }
 
-bool DelayBasedBwe::UpdateEstimate(int64_t arrival_time_ms,
-                                   int64_t now_ms,
+bool DelayBasedBwe::UpdateEstimate(int64_t now_ms,
                                    rtc::Optional<uint32_t> acked_bitrate_bps,
-                                   uint32_t* target_bitrate_bps) {
+                                   bool overusing,
+                                   Result* result) {
   // TODO(terelius): RateControlInput::noise_var is deprecated and will be
   // removed. In the meantime, we set it to zero.
-  const RateControlInput input(detector_.State(), acked_bitrate_bps, 0);
+  const RateControlInput input(overusing ? kBwOverusing : detector_.State(),
+                               acked_bitrate_bps, 0);
   rate_control_.Update(&input, now_ms);
-  *target_bitrate_bps = rate_control_.UpdateBandwidthEstimate(now_ms);
+  result->target_bitrate_bps = rate_control_.UpdateBandwidthEstimate(now_ms);
+  BWE_TEST_LOGGING_PLOT(1, "target_bitrate_bps", now_ms,
+                        result->target_bitrate_bps);
   return rate_control_.ValidEstimate();
 }