Add functionality which limits the number of bytes on the network.

webrtc/modules/remote_bitrate_estimator/send_time_history.cc

Index: webrtc/modules/remote_bitrate_estimator/send_time_history.cc
diff --git a/webrtc/modules/remote_bitrate_estimator/send_time_history.cc b/webrtc/modules/remote_bitrate_estimator/send_time_history.cc
index 734a9207130116d78faec56706ac08f42f23a248..95b41b3ea3520b3cb9f431942d87e2fb724f1c83 100644
--- a/webrtc/modules/remote_bitrate_estimator/send_time_history.cc
+++ b/webrtc/modules/remote_bitrate_estimator/send_time_history.cc
@@ -18,7 +18,9 @@ namespace webrtc {
 
 SendTimeHistory::SendTimeHistory(const Clock* clock,
                                  int64_t packet_age_limit_ms)
-    : clock_(clock), packet_age_limit_ms_(packet_age_limit_ms) {}
+    : clock_(clock),
+      packet_age_limit_ms_(packet_age_limit_ms),
+      latest_acked_seq_num_(-1) {}
 
 SendTimeHistory::~SendTimeHistory() {}
 
@@ -52,6 +54,8 @@ bool SendTimeHistory::GetFeedback(PacketFeedback* packet_feedback,
   RTC_DCHECK(packet_feedback);
   int64_t unwrapped_seq_num =
       seq_num_unwrapper_.Unwrap(packet_feedback->sequence_number);
+  latest_acked_seq_num_ = std::max(unwrapped_seq_num, latest_acked_seq_num_);
+  RTC_DCHECK_GE(latest_acked_seq_num_, 0);
   auto it = history_.find(unwrapped_seq_num);
   if (it == history_.end())
     return false;
@@ -66,4 +70,21 @@ bool SendTimeHistory::GetFeedback(PacketFeedback* packet_feedback,
   return true;
 }
 
+size_t SendTimeHistory::GetOutstandingBytes(uint16_t local_net_id,
+                                            uint16_t remote_net_id) const {
+  size_t outstanding_bytes = 0;
+  auto unacked_it = history_.begin();
+  if (latest_acked_seq_num_ >= 0) {
+    unacked_it = history_.lower_bound(latest_acked_seq_num_);
+  }
+  for (; unacked_it != history_.end(); ++unacked_it) {
+    if (unacked_it->second.local_net_id == local_net_id &&
+        unacked_it->second.remote_net_id == remote_net_id &&
+        unacked_it->second.send_time_ms >= 0) {
+      outstanding_bytes += unacked_it->second.payload_size;
+    }
+  }
+  return outstanding_bytes;
+}
+
 }  // namespace webrtc