From 26a029d407be480d791972afb5975cf62c9360a6 Mon Sep 17 00:00:00 2001
From: Daniel Baumann <daniel.baumann@progress-linux.org>
Date: Fri, 19 Apr 2024 02:47:55 +0200
Subject: Adding upstream version 124.0.1.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
---
 .../rtp/transport_feedback_demuxer.cc              | 95 ++++++++++++++++++++++
 1 file changed, 95 insertions(+)
 create mode 100644 third_party/libwebrtc/modules/congestion_controller/rtp/transport_feedback_demuxer.cc

(limited to 'third_party/libwebrtc/modules/congestion_controller/rtp/transport_feedback_demuxer.cc')

diff --git a/third_party/libwebrtc/modules/congestion_controller/rtp/transport_feedback_demuxer.cc b/third_party/libwebrtc/modules/congestion_controller/rtp/transport_feedback_demuxer.cc
new file mode 100644
index 0000000000..5a6a2e1e9b
--- /dev/null
+++ b/third_party/libwebrtc/modules/congestion_controller/rtp/transport_feedback_demuxer.cc
@@ -0,0 +1,95 @@
+/*
+ *  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 "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
-- 
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