64 lines
2.1 KiB
C++
64 lines
2.1 KiB
C++
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/*
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* Copyright (c) 2021 The WebRTC project authors. All Rights Reserved.
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*
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* Use of this source code is governed by a BSD-style license
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* that can be found in the LICENSE file in the root of the source
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* tree. An additional intellectual property rights grant can be found
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* in the file PATENTS. All contributing project authors may
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* be found in the AUTHORS file in the root of the source tree.
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*/
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#include "modules/congestion_controller/remb_throttler.h"
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#include <algorithm>
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#include <utility>
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namespace webrtc {
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namespace {
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constexpr TimeDelta kRembSendInterval = TimeDelta::Millis(200);
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} // namespace
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RembThrottler::RembThrottler(RembSender remb_sender, Clock* clock)
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: remb_sender_(std::move(remb_sender)),
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clock_(clock),
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last_remb_time_(Timestamp::MinusInfinity()),
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last_send_remb_bitrate_(DataRate::PlusInfinity()),
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max_remb_bitrate_(DataRate::PlusInfinity()) {}
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void RembThrottler::OnReceiveBitrateChanged(const std::vector<uint32_t>& ssrcs,
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uint32_t bitrate_bps) {
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DataRate receive_bitrate = DataRate::BitsPerSec(bitrate_bps);
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Timestamp now = clock_->CurrentTime();
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{
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MutexLock lock(&mutex_);
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// % threshold for if we should send a new REMB asap.
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const int64_t kSendThresholdPercent = 103;
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if (receive_bitrate * kSendThresholdPercent / 100 >
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last_send_remb_bitrate_ &&
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now < last_remb_time_ + kRembSendInterval) {
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return;
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}
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last_remb_time_ = now;
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last_send_remb_bitrate_ = receive_bitrate;
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receive_bitrate = std::min(last_send_remb_bitrate_, max_remb_bitrate_);
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}
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remb_sender_(receive_bitrate.bps(), ssrcs);
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}
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void RembThrottler::SetMaxDesiredReceiveBitrate(DataRate bitrate) {
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Timestamp now = clock_->CurrentTime();
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{
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MutexLock lock(&mutex_);
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max_remb_bitrate_ = bitrate;
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if (now - last_remb_time_ < kRembSendInterval &&
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!last_send_remb_bitrate_.IsZero() &&
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last_send_remb_bitrate_ <= max_remb_bitrate_) {
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return;
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}
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}
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remb_sender_(bitrate.bps(), /*ssrcs=*/{});
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}
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} // namespace webrtc
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