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-rw-r--r--libtransport/src/protocols/rtc/rtc_rc_frame.cc79
1 files changed, 79 insertions, 0 deletions
diff --git a/libtransport/src/protocols/rtc/rtc_rc_frame.cc b/libtransport/src/protocols/rtc/rtc_rc_frame.cc
new file mode 100644
index 000000000..b577b5bea
--- /dev/null
+++ b/libtransport/src/protocols/rtc/rtc_rc_frame.cc
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+/*
+ * Copyright (c) 2017-2021 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.
+ */
+
+#include <protocols/rtc/rtc_consts.h>
+#include <protocols/rtc/rtc_rc_frame.h>
+
+#include <algorithm>
+
+namespace transport {
+
+namespace protocol {
+
+namespace rtc {
+
+RTCRateControlFrame::RTCRateControlFrame() : cc_detector_() {}
+
+RTCRateControlFrame::~RTCRateControlFrame() {}
+
+void RTCRateControlFrame::onNewRound(double round_len) {
+ if (!rc_on_) return;
+
+ CongestionState prev_congestion_state = congestion_state_;
+ cc_detector_.updateStats();
+ congestion_state_ = (CongestionState)cc_detector_.getState();
+
+ if (congestion_state_ == CongestionState::Congested) {
+ if (prev_congestion_state == CongestionState::Normal) {
+ // congestion detected, notify app and init congestion win
+ double prod_rate = protocol_state_->getReceivedRate();
+ double rtt = (double)protocol_state_->getRTT() / MILLI_IN_A_SEC;
+ double packet_size = protocol_state_->getAveragePacketSize();
+
+ if (prod_rate == 0.0 || rtt == 0.0 || packet_size == 0.0) {
+ // TODO do something
+ return;
+ }
+
+ congestion_win_ = (uint32_t)ceil(prod_rate * rtt / packet_size);
+ }
+ uint32_t win = congestion_win_ * WIN_DECREASE_FACTOR;
+ congestion_win_ = std::max(win, WIN_MIN);
+ return;
+ }
+}
+
+void RTCRateControlFrame::onDataPacketReceived(
+ const core::ContentObject &content_object) {
+ if (!rc_on_) return;
+
+ uint32_t seq = content_object.getName().getSuffix();
+ if (!protocol_state_->isPending(seq)) return;
+
+ cc_detector_.addPacket(content_object);
+}
+
+void RTCRateControlFrame::receivedBwProbeTrain(uint64_t firts_probe_ts,
+ uint64_t last_probe_ts,
+ uint32_t total_probes) {
+ // TODO
+ return;
+}
+
+} // end namespace rtc
+
+} // end namespace protocol
+
+} // end namespace transport