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// Copyright 2024 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "third_party/blink/renderer/modules/peerconnection/intercepting_network_controller.h"
#include "third_party/blink/renderer/modules/peerconnection/adapters/web_rtc_cross_thread_copier.h"
#include "third_party/blink/renderer/platform/scheduler/public/post_cross_thread_task.h"
#include "third_party/blink/renderer/platform/wtf/cross_thread_copier_base.h"
#include "third_party/blink/renderer/platform/wtf/cross_thread_functional.h"
namespace blink {
namespace {
webrtc::TargetTransferRate CreateTargetTransferRate(
webrtc::Timestamp at_time,
uint64_t custom_max_bitrate_bps) {
webrtc::DataRate data_rate =
webrtc::DataRate::BitsPerSec(custom_max_bitrate_bps);
webrtc::NetworkEstimate network_estimate;
network_estimate.at_time = at_time;
network_estimate.bandwidth = data_rate;
// This RTT is used within libwebrtc to configure FEC.
// TODO(crbug.com/345101934): Supply it from a different RTT estimator, or add
// it to the JS interface.
network_estimate.round_trip_time = webrtc::TimeDelta::Millis(0);
// The bwe_period field is deprecated in webrtc, having been replaced by
// stable_target_rate, but must still be set.
network_estimate.bwe_period = webrtc::TimeDelta::Millis(0);
return {
.at_time = at_time,
.network_estimate = network_estimate,
.target_rate = data_rate,
.stable_target_rate = data_rate,
};
}
webrtc::NetworkControlUpdate OverwriteTargetRate(
webrtc::NetworkControlUpdate fallback_update,
std::optional<uint64_t> custom_max_bitrate_bps) {
if (!fallback_update.target_rate || !custom_max_bitrate_bps) {
return fallback_update;
}
webrtc::TargetTransferRate target_transfer_rate = CreateTargetTransferRate(
fallback_update.target_rate->at_time, *custom_max_bitrate_bps);
fallback_update.target_rate = target_transfer_rate;
return fallback_update;
}
} // namespace
InterceptingNetworkController::InterceptingNetworkController(
std::unique_ptr<webrtc::NetworkControllerInterface> fallback_controller,
CrossThreadWeakHandle<RTCRtpTransport> rtp_transport_handle,
scoped_refptr<base::SequencedTaskRunner> task_runner)
: fallback_controller_(std::move(fallback_controller)),
feedback_provider_(base::MakeRefCounted<FeedbackProviderImpl>()) {
PostCrossThreadTask(
*task_runner, FROM_HERE,
CrossThreadBindOnce(
&RTCRtpTransport::RegisterFeedbackProvider,
MakeUnwrappingCrossThreadWeakHandle(rtp_transport_handle),
feedback_provider_));
}
webrtc::NetworkControlUpdate
InterceptingNetworkController::OnNetworkAvailability(
webrtc::NetworkAvailability na) {
return OverwriteTargetRate(fallback_controller_->OnNetworkAvailability(na),
feedback_provider_->CustomMaxBitrateBps());
}
webrtc::NetworkControlUpdate
InterceptingNetworkController::OnNetworkRouteChange(
webrtc::NetworkRouteChange nrc) {
return OverwriteTargetRate(fallback_controller_->OnNetworkRouteChange(nrc),
feedback_provider_->CustomMaxBitrateBps());
}
webrtc::NetworkControlUpdate InterceptingNetworkController::OnProcessInterval(
webrtc::ProcessInterval pi) {
webrtc::NetworkControlUpdate fallback_update =
fallback_controller_->OnProcessInterval(pi);
if (!feedback_provider_->CustomMaxBitrateBps()) {
return fallback_update;
}
webrtc::TargetTransferRate target_rate = CreateTargetTransferRate(
pi.at_time, *feedback_provider_->CustomMaxBitrateBps());
webrtc::NetworkControlUpdate update;
update.target_rate = target_rate;
return update;
}
webrtc::NetworkControlUpdate
InterceptingNetworkController::OnRemoteBitrateReport(
webrtc::RemoteBitrateReport rbr) {
return OverwriteTargetRate(fallback_controller_->OnRemoteBitrateReport(rbr),
feedback_provider_->CustomMaxBitrateBps());
}
webrtc::NetworkControlUpdate
InterceptingNetworkController::OnRoundTripTimeUpdate(
webrtc::RoundTripTimeUpdate rttu) {
return OverwriteTargetRate(fallback_controller_->OnRoundTripTimeUpdate(rttu),
feedback_provider_->CustomMaxBitrateBps());
}
webrtc::NetworkControlUpdate InterceptingNetworkController::OnSentPacket(
webrtc::SentPacket sp) {
feedback_provider_->OnSentPacket(sp);
return OverwriteTargetRate(fallback_controller_->OnSentPacket(sp),
feedback_provider_->CustomMaxBitrateBps());
}
webrtc::NetworkControlUpdate InterceptingNetworkController::OnReceivedPacket(
webrtc::ReceivedPacket rp) {
return OverwriteTargetRate(fallback_controller_->OnReceivedPacket(rp),
feedback_provider_->CustomMaxBitrateBps());
}
webrtc::NetworkControlUpdate InterceptingNetworkController::OnStreamsConfig(
webrtc::StreamsConfig sc) {
return OverwriteTargetRate(fallback_controller_->OnStreamsConfig(sc),
feedback_provider_->CustomMaxBitrateBps());
}
webrtc::NetworkControlUpdate
InterceptingNetworkController::OnTargetRateConstraints(
webrtc::TargetRateConstraints trc) {
return OverwriteTargetRate(fallback_controller_->OnTargetRateConstraints(trc),
feedback_provider_->CustomMaxBitrateBps());
}
webrtc::NetworkControlUpdate
InterceptingNetworkController::OnTransportLossReport(
webrtc::TransportLossReport tlr) {
return OverwriteTargetRate(fallback_controller_->OnTransportLossReport(tlr),
feedback_provider_->CustomMaxBitrateBps());
}
webrtc::NetworkControlUpdate
InterceptingNetworkController::OnTransportPacketsFeedback(
webrtc::TransportPacketsFeedback tpf) {
feedback_provider_->OnFeedback(tpf);
return OverwriteTargetRate(
fallback_controller_->OnTransportPacketsFeedback(tpf),
feedback_provider_->CustomMaxBitrateBps());
}
webrtc::NetworkControlUpdate
InterceptingNetworkController::OnNetworkStateEstimate(
webrtc::NetworkStateEstimate nse) {
return OverwriteTargetRate(fallback_controller_->OnNetworkStateEstimate(nse),
feedback_provider_->CustomMaxBitrateBps());
}
void InterceptingNetworkController::FeedbackProviderImpl::OnFeedback(
webrtc::TransportPacketsFeedback feedback) {
// Called on a WebRTC thread.
base::AutoLock mutex(processor_lock_);
// TODO(crbug.com/345101934): Consider buffering these until the
// processor_handle has been created and then replaying them.
if (!rtp_transport_processor_handle_) {
return;
}
CHECK(!rtp_transport_processor_task_runner_->RunsTasksInCurrentSequence());
PostCrossThreadTask(
*rtp_transport_processor_task_runner_, FROM_HERE,
CrossThreadBindOnce(&InterceptingNetworkController::FeedbackProviderImpl::
OnFeedbackOnDestinationTaskRunner,
WrapRefCounted(this), feedback,
MakeUnwrappingCrossThreadWeakHandle(
*rtp_transport_processor_handle_)));
}
void InterceptingNetworkController::FeedbackProviderImpl::
OnFeedbackOnDestinationTaskRunner(
webrtc::TransportPacketsFeedback feedback,
RTCRtpTransportProcessor* rtp_transport_processor) {
// Runs on the task runner matching the JS thread of rtp_transport_processor.
if (rtp_transport_processor) {
rtp_transport_processor->OnFeedback(feedback);
}
}
void InterceptingNetworkController::FeedbackProviderImpl::OnSentPacket(
webrtc::SentPacket sp) {
// Called on a WebRTC thread.
base::AutoLock mutex(processor_lock_);
// TODO(crbug.com/345101934): Consider buffering these until the
// processor_handle has been created and then replaying them
if (!rtp_transport_processor_handle_) {
return;
}
CHECK(!rtp_transport_processor_task_runner_->RunsTasksInCurrentSequence());
PostCrossThreadTask(
*rtp_transport_processor_task_runner_, FROM_HERE,
CrossThreadBindOnce(&InterceptingNetworkController::FeedbackProviderImpl::
OnSentPacketOnDestinationTaskRunner,
WrapRefCounted(this), sp,
MakeUnwrappingCrossThreadWeakHandle(
*rtp_transport_processor_handle_)));
}
void InterceptingNetworkController::FeedbackProviderImpl::
OnSentPacketOnDestinationTaskRunner(
webrtc::SentPacket sp,
RTCRtpTransportProcessor* rtp_transport_processor) {
// Runs on the task runner matching the JS thread of rtp_transport_processor
// ie a worker.
if (rtp_transport_processor) {
rtp_transport_processor->OnSentPacket(sp);
}
}
void InterceptingNetworkController::FeedbackProviderImpl::SetProcessor(
CrossThreadWeakHandle<RTCRtpTransportProcessor>
rtp_transport_processor_handle,
scoped_refptr<base::SequencedTaskRunner>
rtp_transport_processor_task_runner) {
// Called on the main JS thread owning the RTCRtpTransport instance.
base::AutoLock mutex(processor_lock_);
rtp_transport_processor_handle_.emplace(
std::move(rtp_transport_processor_handle));
rtp_transport_processor_task_runner_ =
std::move(rtp_transport_processor_task_runner);
}
} // namespace blink
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