1 files changed, 80 insertions, 0 deletions
diff --git a/libtransport/src/protocols/rtc_data_path.h b/libtransport/src/protocols/rtc_data_path.h
new file mode 100644
index 000000000..9076b355f
--- /dev/null
+++ b/libtransport/src/protocols/rtc_data_path.h
@@ -0,0 +1,80 @@
+/*
+ * Copyright (c) 2017-2019 Cisco and/or its affiliates.
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at:
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#pragma once
+
+#include <stdint.h>
+#include <climits>
+
+#include <utils/min_filter.h>
+
+#define ALPHA_RTC 0.125
+#define HISTORY_LEN 20  // 4 sec
+
+namespace transport {
+
+namespace protocol {
+
+class RTCDataPath {
+ public:
+  RTCDataPath();
+
+ public:
+  void insertRttSample(uint64_t rtt);
+  void insertOwdSample(int64_t owd);
+  void computeInterArrivalGap(uint32_t segmentNumber);
+  void receivedNack();
+
+  uint64_t getMinRtt();
+  double getQueuingDealy();
+  double getInterArrivalGap();
+  bool isActive();
+
+  void roundEnd();
+
+ private:
+  int64_t getMinOwd();
+
+  uint64_t min_rtt;
+  uint64_t prev_min_rtt;
+
+  int64_t min_owd;
+  int64_t prev_min_owd;
+
+  double avg_owd;
+
+  double queuing_delay;
+
+  uint32_t lastRecvSeq_;
+  uint64_t lastRecvTime_;
+  double avg_inter_arrival_;
+
+  // flags to check if a path is active
+  // we considere a path active if it reaches a producer
+  //(not a cache) --aka we got at least one nack on this path--
+  // and if we receives packets
+  bool received_nacks_;
+  bool received_packets_;
+  uint8_t rounds_without_packets_;  // if we don't get any packet
+                                    // for MAX_ROUNDS_WITHOUT_PKTS
+                                    // we consider the path inactive
+
+  utils::MinFilter<uint64_t> RTThistory_;
+  utils::MinFilter<int64_t> OWDhistory_;
+};
+
+}  // namespace protocol
+
+}  // end namespace transport