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-rw-r--r--libtransport/src/protocols/rtc_data_path.cc156
1 files changed, 0 insertions, 156 deletions
diff --git a/libtransport/src/protocols/rtc_data_path.cc b/libtransport/src/protocols/rtc_data_path.cc
deleted file mode 100644
index 30644e939..000000000
--- a/libtransport/src/protocols/rtc_data_path.cc
+++ /dev/null
@@ -1,156 +0,0 @@
-/*
- * 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.
- */
-
-#include <protocols/rtc_data_path.h>
-
-#include <cfloat>
-#include <chrono>
-
-#define MAX_ROUNDS_WITHOUT_PKTS 10 // 2sec
-
-namespace transport {
-
-namespace protocol {
-
-RTCDataPath::RTCDataPath()
- : min_rtt(UINT_MAX),
- prev_min_rtt(UINT_MAX),
- min_owd(INT_MAX), // this is computed like in LEDBAT, so it is not the
- // real OWD, but the measured one, that depends on the
- // clock of sender and receiver. the only meaningful
- // value is is the queueing delay. for this reason we
- // keep both RTT (for the windowd calculation) and OWD
- // (for congestion/quality control)
- prev_min_owd(INT_MAX),
- avg_owd(0.0),
- queuing_delay(DBL_MAX),
- lastRecvSeq_(0),
- lastRecvTime_(0),
- avg_inter_arrival_(DBL_MAX),
- received_nacks_(false),
- received_packets_(false),
- rounds_without_packets_(0),
- RTThistory_(HISTORY_LEN),
- OWDhistory_(HISTORY_LEN){};
-
-void RTCDataPath::insertRttSample(uint64_t rtt) {
- // for the rtt we only keep track of the min one
- if (rtt < min_rtt) min_rtt = rtt;
-}
-
-void RTCDataPath::insertOwdSample(int64_t owd) {
- // for owd we use both min and avg
- if (owd < min_owd) min_owd = owd;
-
- if (avg_owd != DBL_MAX)
- avg_owd = (avg_owd * (1 - ALPHA_RTC)) + (owd * ALPHA_RTC);
- else {
- avg_owd = owd;
- }
-
- // owd is computed only for valid data packets so we count only
- // this for decide if we recevie traffic or not
- received_packets_ = true;
-}
-
-void RTCDataPath::computeInterArrivalGap(uint32_t segmentNumber) {
- // got packet in sequence, compute gap
- if (lastRecvSeq_ == (segmentNumber - 1)) {
- uint64_t now = std::chrono::duration_cast<std::chrono::milliseconds>(
- std::chrono::steady_clock::now().time_since_epoch())
- .count();
- uint64_t delta = now - lastRecvTime_;
- lastRecvSeq_ = segmentNumber;
- lastRecvTime_ = now;
- if (avg_inter_arrival_ == DBL_MAX)
- avg_inter_arrival_ = delta;
- else
- avg_inter_arrival_ =
- (avg_inter_arrival_ * (1 - ALPHA_RTC)) + (delta * ALPHA_RTC);
- return;
- }
-
- // ooo packet, update the stasts if needed
- if (lastRecvSeq_ <= segmentNumber) {
- lastRecvSeq_ = segmentNumber;
- lastRecvTime_ = std::chrono::duration_cast<std::chrono::milliseconds>(
- std::chrono::steady_clock::now().time_since_epoch())
- .count();
- }
-}
-
-void RTCDataPath::receivedNack() { received_nacks_ = true; }
-
-double RTCDataPath::getInterArrivalGap() {
- if (avg_inter_arrival_ == DBL_MAX) return 0;
- return avg_inter_arrival_;
-}
-
-bool RTCDataPath::isActive() {
- if (received_nacks_ && rounds_without_packets_ < MAX_ROUNDS_WITHOUT_PKTS)
- return true;
- return false;
-}
-
-void RTCDataPath::roundEnd() {
- // reset min_rtt and add it to the history
- if (min_rtt != UINT_MAX) {
- prev_min_rtt = min_rtt;
- } else {
- // this may happen if we do not receive any packet
- // from this path in the last round. in this case
- // we use the measure from the previuos round
- min_rtt = prev_min_rtt;
- }
-
- if (min_rtt == 0) min_rtt = 1;
-
- RTThistory_.pushBack(min_rtt);
- min_rtt = UINT_MAX;
-
- // do the same for min owd
- if (min_owd != INT_MAX) {
- prev_min_owd = min_owd;
- } else {
- min_owd = prev_min_owd;
- }
-
- if (min_owd != INT_MAX) {
- OWDhistory_.pushBack(min_owd);
- min_owd = INT_MAX;
-
- // compute queuing delay
- queuing_delay = avg_owd - getMinOwd();
-
- } else {
- queuing_delay = 0.0;
- }
-
- if (!received_packets_)
- rounds_without_packets_++;
- else
- rounds_without_packets_ = 0;
- received_packets_ = false;
-}
-
-double RTCDataPath::getQueuingDealy() { return queuing_delay; }
-
-uint64_t RTCDataPath::getMinRtt() { return RTThistory_.begin(); }
-
-int64_t RTCDataPath::getMinOwd() { return OWDhistory_.begin(); }
-
-} // end namespace protocol
-
-} // end namespace transport