c3e3e60f59
Rationale: 1. sinks_ is not properly differentiated from rsid_sinks_. 2. Consistency with RtcpDemuxer. BUG=webrtc:7135 Review-Url: https://codereview.webrtc.org/2958283002 Cr-Commit-Position: refs/heads/master@{#18813}
140 lines
4.7 KiB
C++
140 lines
4.7 KiB
C++
/*
|
|
* Copyright (c) 2017 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 "webrtc/call/rtp_demuxer.h"
|
|
|
|
#include "webrtc/base/checks.h"
|
|
#include "webrtc/base/logging.h"
|
|
#include "webrtc/call/rsid_resolution_observer.h"
|
|
#include "webrtc/call/rtp_packet_sink_interface.h"
|
|
#include "webrtc/call/rtp_rtcp_demuxer_helper.h"
|
|
#include "webrtc/modules/rtp_rtcp/source/rtp_header_extensions.h"
|
|
#include "webrtc/modules/rtp_rtcp/source/rtp_packet_received.h"
|
|
|
|
namespace webrtc {
|
|
|
|
namespace {
|
|
constexpr size_t kMaxProcessedSsrcs = 1000; // Prevent memory overuse.
|
|
} // namespace
|
|
|
|
RtpDemuxer::RtpDemuxer() = default;
|
|
|
|
RtpDemuxer::~RtpDemuxer() {
|
|
RTC_DCHECK(ssrc_sinks_.empty());
|
|
RTC_DCHECK(rsid_sinks_.empty());
|
|
}
|
|
|
|
void RtpDemuxer::AddSink(uint32_t ssrc, RtpPacketSinkInterface* sink) {
|
|
RTC_DCHECK(sink);
|
|
RecordSsrcToSinkAssociation(ssrc, sink);
|
|
}
|
|
|
|
void RtpDemuxer::AddSink(const std::string& rsid,
|
|
RtpPacketSinkInterface* sink) {
|
|
RTC_DCHECK(StreamId::IsLegalName(rsid));
|
|
RTC_DCHECK(sink);
|
|
RTC_DCHECK(!MultimapAssociationExists(rsid_sinks_, rsid, sink));
|
|
|
|
rsid_sinks_.emplace(rsid, sink);
|
|
|
|
// This RSID might now map to an SSRC which we saw earlier.
|
|
processed_ssrcs_.clear();
|
|
}
|
|
|
|
bool RtpDemuxer::RemoveSink(const RtpPacketSinkInterface* sink) {
|
|
RTC_DCHECK(sink);
|
|
return (RemoveFromMultimapByValue(&ssrc_sinks_, sink) +
|
|
RemoveFromMultimapByValue(&rsid_sinks_, sink)) > 0;
|
|
}
|
|
|
|
void RtpDemuxer::RecordSsrcToSinkAssociation(uint32_t ssrc,
|
|
RtpPacketSinkInterface* sink) {
|
|
RTC_DCHECK(sink);
|
|
// The association might already have been set by a different
|
|
// configuration source.
|
|
if (!MultimapAssociationExists(ssrc_sinks_, ssrc, sink)) {
|
|
ssrc_sinks_.emplace(ssrc, sink);
|
|
}
|
|
}
|
|
|
|
bool RtpDemuxer::OnRtpPacket(const RtpPacketReceived& packet) {
|
|
ResolveAssociations(packet);
|
|
auto it_range = ssrc_sinks_.equal_range(packet.Ssrc());
|
|
for (auto it = it_range.first; it != it_range.second; ++it) {
|
|
it->second->OnRtpPacket(packet);
|
|
}
|
|
return it_range.first != it_range.second;
|
|
}
|
|
|
|
void RtpDemuxer::RegisterRsidResolutionObserver(
|
|
RsidResolutionObserver* observer) {
|
|
RTC_DCHECK(observer);
|
|
RTC_DCHECK(!ContainerHasKey(rsid_resolution_observers_, observer));
|
|
|
|
rsid_resolution_observers_.push_back(observer);
|
|
|
|
processed_ssrcs_.clear(); // New observer requires new notifications.
|
|
}
|
|
|
|
void RtpDemuxer::DeregisterRsidResolutionObserver(
|
|
const RsidResolutionObserver* observer) {
|
|
RTC_DCHECK(observer);
|
|
auto it = std::find(rsid_resolution_observers_.begin(),
|
|
rsid_resolution_observers_.end(), observer);
|
|
RTC_DCHECK(it != rsid_resolution_observers_.end());
|
|
rsid_resolution_observers_.erase(it);
|
|
}
|
|
|
|
void RtpDemuxer::ResolveAssociations(const RtpPacketReceived& packet) {
|
|
// Avoid expensive string comparisons for RSID by looking the sinks up only
|
|
// by SSRC whenever possible.
|
|
if (processed_ssrcs_.find(packet.Ssrc()) != processed_ssrcs_.cend()) {
|
|
return;
|
|
}
|
|
|
|
ResolveRsidToSsrcAssociations(packet);
|
|
|
|
if (processed_ssrcs_.size() < kMaxProcessedSsrcs) { // Prevent memory overuse
|
|
processed_ssrcs_.insert(packet.Ssrc()); // Avoid re-examining in-depth.
|
|
} else if (!logged_max_processed_ssrcs_exceeded_) {
|
|
LOG(LS_WARNING) << "More than " << kMaxProcessedSsrcs
|
|
<< " different SSRCs seen.";
|
|
logged_max_processed_ssrcs_exceeded_ = true;
|
|
}
|
|
}
|
|
|
|
void RtpDemuxer::ResolveRsidToSsrcAssociations(
|
|
const RtpPacketReceived& packet) {
|
|
std::string rsid;
|
|
if (packet.GetExtension<RtpStreamId>(&rsid)) {
|
|
// All streams associated with this RSID need to be marked as associated
|
|
// with this SSRC (if they aren't already).
|
|
auto it_range = rsid_sinks_.equal_range(rsid);
|
|
for (auto it = it_range.first; it != it_range.second; ++it) {
|
|
RecordSsrcToSinkAssociation(packet.Ssrc(), it->second);
|
|
}
|
|
|
|
NotifyObserversOfRsidResolution(rsid, packet.Ssrc());
|
|
|
|
// To prevent memory-overuse attacks, forget this RSID. Future packets
|
|
// with this RSID, but a different SSRC, will not spawn new associations.
|
|
rsid_sinks_.erase(it_range.first, it_range.second);
|
|
}
|
|
}
|
|
|
|
void RtpDemuxer::NotifyObserversOfRsidResolution(const std::string& rsid,
|
|
uint32_t ssrc) {
|
|
for (auto* observer : rsid_resolution_observers_) {
|
|
observer->OnRsidResolved(rsid, ssrc);
|
|
}
|
|
}
|
|
|
|
} // namespace webrtc
|