New ProbingCalculator class.

webrtc/modules/congestion_controller/probe_bitrate_estimator.h

+/*
+ *  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.
+ */
+
+#ifndef WEBRTC_MODULES_CONGESTION_CONTROLLER_PROBE_BITRATE_ESTIMATOR_H_
+#define WEBRTC_MODULES_CONGESTION_CONTROLLER_PROBE_BITRATE_ESTIMATOR_H_
+
+#include <map>
+#include <limits>
+
+#include "webrtc/modules/rtp_rtcp/include/rtp_rtcp_defines.h"
+
+namespace webrtc {
+
+struct ProbingResult {
+  static constexpr int kNoEstimate = -1;
+
+  ProbingResult();
+  ProbingResult(int bps, int64_t timestamp);
+
+  int bps;
+  int64_t timestamp;
+};
+
+class ProbeBitrateEstimator {
+ public:
+  ProbeBitrateEstimator();
+
+  // Should be called for every packet we receive feedback about. If the
+  // packet was used for probing it will validate/calculate the resulting
+  // bitrate and return the result.
+  ProbingResult PacketFeedback(const PacketInfo& packet_info);
+
+ private:
+  struct AggregatedCluster {
+    int num_probes = 0;
+    int64_t first_send_ms = std::numeric_limits<int64_t>::max();
+    int64_t last_send_ms = 0;
+    int64_t first_receive_ms = std::numeric_limits<int64_t>::max();
+    int64_t last_receive_ms = 0;
+    size_t size = 0;
+  };
+
+  std::map<int, AggregatedCluster> clusters_;
+  int last_valid_cluster_id_;
+};
+
+}  // namespace webrtc
+
+#endif  // WEBRTC_MODULES_CONGESTION_CONTROLLER_PROBE_BITRATE_ESTIMATOR_H_