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/*
* Copyright (c) 2019 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.
*/
#include "modules/congestion_controller/rtp/transport_feedback_demuxer.h"
#include <utility>
#include <vector>
#include "absl/algorithm/container.h"
#include "modules/rtp_rtcp/source/rtcp_packet/transport_feedback.h"
namespace webrtc {
namespace {
static const size_t kMaxPacketsInHistory = 5000;
}
TransportFeedbackDemuxer::TransportFeedbackDemuxer() {
// In case the construction thread is different from where the registration
// and callbacks occur, detach from the construction thread.
observer_checker_.Detach();
}
void TransportFeedbackDemuxer::RegisterStreamFeedbackObserver(
std::vector<uint32_t> ssrcs,
StreamFeedbackObserver* observer) {
RTC_DCHECK_RUN_ON(&observer_checker_);
RTC_DCHECK(observer);
RTC_DCHECK(absl::c_find_if(observers_, [=](const auto& pair) {
return pair.second == observer;
}) == observers_.end());
observers_.push_back({ssrcs, observer});
}
void TransportFeedbackDemuxer::DeRegisterStreamFeedbackObserver(
StreamFeedbackObserver* observer) {
RTC_DCHECK_RUN_ON(&observer_checker_);
RTC_DCHECK(observer);
const auto it = absl::c_find_if(
observers_, [=](const auto& pair) { return pair.second == observer; });
RTC_DCHECK(it != observers_.end());
observers_.erase(it);
}
void TransportFeedbackDemuxer::AddPacket(const RtpPacketSendInfo& packet_info) {
RTC_DCHECK_RUN_ON(&observer_checker_);
StreamFeedbackObserver::StreamPacketInfo info;
info.ssrc = packet_info.media_ssrc;
info.rtp_sequence_number = packet_info.rtp_sequence_number;
info.received = false;
info.is_retransmission =
packet_info.packet_type == RtpPacketMediaType::kRetransmission;
history_.insert(
{seq_num_unwrapper_.Unwrap(packet_info.transport_sequence_number), info});
while (history_.size() > kMaxPacketsInHistory) {
history_.erase(history_.begin());
}
}
void TransportFeedbackDemuxer::OnTransportFeedback(
const rtcp::TransportFeedback& feedback) {
RTC_DCHECK_RUN_ON(&observer_checker_);
std::vector<StreamFeedbackObserver::StreamPacketInfo> stream_feedbacks;
feedback.ForAllPackets(
[&](uint16_t sequence_number, TimeDelta delta_since_base) {
RTC_DCHECK_RUN_ON(&observer_checker_);
auto it = history_.find(seq_num_unwrapper_.PeekUnwrap(sequence_number));
if (it != history_.end()) {
auto packet_info = it->second;
packet_info.received = delta_since_base.IsFinite();
stream_feedbacks.push_back(std::move(packet_info));
if (delta_since_base.IsFinite())
history_.erase(it);
}
});
for (auto& observer : observers_) {
std::vector<StreamFeedbackObserver::StreamPacketInfo> selected_feedback;
for (const auto& packet_info : stream_feedbacks) {
if (absl::c_count(observer.first, packet_info.ssrc) > 0) {
selected_feedback.push_back(packet_info);
}
}
if (!selected_feedback.empty()) {
observer.second->OnPacketFeedbackVector(std::move(selected_feedback));
}
}
}
} // namespace webrtc