206 lines
7.2 KiB
C++
206 lines
7.2 KiB
C++
/*
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* Copyright (c) 2016 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 "call/flexfec_receive_stream_impl.h"
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#include <stddef.h>
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#include <cstdint>
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#include <string>
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#include <vector>
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#include "api/array_view.h"
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#include "api/call/transport.h"
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#include "api/rtp_parameters.h"
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#include "call/rtp_stream_receiver_controller_interface.h"
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#include "modules/rtp_rtcp/include/flexfec_receiver.h"
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#include "modules/rtp_rtcp/include/receive_statistics.h"
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#include "modules/rtp_rtcp/source/rtp_packet_received.h"
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#include "modules/utility/include/process_thread.h"
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#include "rtc_base/checks.h"
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#include "rtc_base/location.h"
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#include "rtc_base/logging.h"
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#include "rtc_base/strings/string_builder.h"
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#include "system_wrappers/include/clock.h"
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namespace webrtc {
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std::string FlexfecReceiveStream::Stats::ToString(int64_t time_ms) const {
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char buf[1024];
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rtc::SimpleStringBuilder ss(buf);
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ss << "FlexfecReceiveStream stats: " << time_ms
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<< ", {flexfec_bitrate_bps: " << flexfec_bitrate_bps << "}";
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return ss.str();
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}
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std::string FlexfecReceiveStream::Config::ToString() const {
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char buf[1024];
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rtc::SimpleStringBuilder ss(buf);
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ss << "{payload_type: " << payload_type;
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ss << ", remote_ssrc: " << remote_ssrc;
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ss << ", local_ssrc: " << local_ssrc;
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ss << ", protected_media_ssrcs: [";
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size_t i = 0;
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for (; i + 1 < protected_media_ssrcs.size(); ++i)
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ss << protected_media_ssrcs[i] << ", ";
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if (!protected_media_ssrcs.empty())
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ss << protected_media_ssrcs[i];
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ss << "], transport_cc: " << (transport_cc ? "on" : "off");
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ss << ", rtp_header_extensions: [";
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i = 0;
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for (; i + 1 < rtp_header_extensions.size(); ++i)
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ss << rtp_header_extensions[i].ToString() << ", ";
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if (!rtp_header_extensions.empty())
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ss << rtp_header_extensions[i].ToString();
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ss << "]}";
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return ss.str();
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}
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bool FlexfecReceiveStream::Config::IsCompleteAndEnabled() const {
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// Check if FlexFEC is enabled.
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if (payload_type < 0)
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return false;
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// Do we have the necessary SSRC information?
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if (remote_ssrc == 0)
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return false;
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// TODO(brandtr): Update this check when we support multistream protection.
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if (protected_media_ssrcs.size() != 1u)
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return false;
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return true;
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}
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namespace {
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// TODO(brandtr): Update this function when we support multistream protection.
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std::unique_ptr<FlexfecReceiver> MaybeCreateFlexfecReceiver(
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Clock* clock,
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const FlexfecReceiveStream::Config& config,
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RecoveredPacketReceiver* recovered_packet_receiver) {
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if (config.payload_type < 0) {
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RTC_LOG(LS_WARNING)
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<< "Invalid FlexFEC payload type given. "
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"This FlexfecReceiveStream will therefore be useless.";
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return nullptr;
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}
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RTC_DCHECK_GE(config.payload_type, 0);
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RTC_DCHECK_LE(config.payload_type, 127);
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if (config.remote_ssrc == 0) {
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RTC_LOG(LS_WARNING)
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<< "Invalid FlexFEC SSRC given. "
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"This FlexfecReceiveStream will therefore be useless.";
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return nullptr;
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}
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if (config.protected_media_ssrcs.empty()) {
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RTC_LOG(LS_WARNING)
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<< "No protected media SSRC supplied. "
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"This FlexfecReceiveStream will therefore be useless.";
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return nullptr;
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}
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if (config.protected_media_ssrcs.size() > 1) {
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RTC_LOG(LS_WARNING)
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<< "The supplied FlexfecConfig contained multiple protected "
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"media streams, but our implementation currently only "
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"supports protecting a single media stream. "
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"To avoid confusion, disabling FlexFEC completely.";
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return nullptr;
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}
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RTC_DCHECK_EQ(1U, config.protected_media_ssrcs.size());
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return std::unique_ptr<FlexfecReceiver>(new FlexfecReceiver(
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clock, config.remote_ssrc, config.protected_media_ssrcs[0],
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recovered_packet_receiver));
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}
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std::unique_ptr<ModuleRtpRtcpImpl2> CreateRtpRtcpModule(
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Clock* clock,
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ReceiveStatistics* receive_statistics,
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const FlexfecReceiveStreamImpl::Config& config,
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RtcpRttStats* rtt_stats) {
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RtpRtcpInterface::Configuration configuration;
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configuration.audio = false;
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configuration.receiver_only = true;
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configuration.clock = clock;
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configuration.receive_statistics = receive_statistics;
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configuration.outgoing_transport = config.rtcp_send_transport;
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configuration.rtt_stats = rtt_stats;
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configuration.local_media_ssrc = config.local_ssrc;
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return ModuleRtpRtcpImpl2::Create(configuration);
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}
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} // namespace
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FlexfecReceiveStreamImpl::FlexfecReceiveStreamImpl(
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Clock* clock,
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RtpStreamReceiverControllerInterface* receiver_controller,
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const Config& config,
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RecoveredPacketReceiver* recovered_packet_receiver,
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RtcpRttStats* rtt_stats,
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ProcessThread* process_thread)
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: config_(config),
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receiver_(MaybeCreateFlexfecReceiver(clock,
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config_,
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recovered_packet_receiver)),
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rtp_receive_statistics_(ReceiveStatistics::Create(clock)),
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rtp_rtcp_(CreateRtpRtcpModule(clock,
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rtp_receive_statistics_.get(),
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config_,
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rtt_stats)),
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process_thread_(process_thread) {
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RTC_LOG(LS_INFO) << "FlexfecReceiveStreamImpl: " << config_.ToString();
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// RTCP reporting.
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rtp_rtcp_->SetRTCPStatus(config_.rtcp_mode);
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process_thread_->RegisterModule(rtp_rtcp_.get(), RTC_FROM_HERE);
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// Register with transport.
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// TODO(nisse): OnRtpPacket in this class delegates all real work to
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// |receiver_|. So maybe we don't need to implement RtpPacketSinkInterface
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// here at all, we'd then delete the OnRtpPacket method and instead register
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// |receiver_| as the RtpPacketSinkInterface for this stream.
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// TODO(nisse): Passing |this| from the constructor to the RtpDemuxer, before
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// the object is fully initialized, is risky. But it works in this case
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// because locking in our caller, Call::CreateFlexfecReceiveStream, ensures
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// that the demuxer doesn't call OnRtpPacket before this object is fully
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// constructed. Registering |receiver_| instead of |this| would solve this
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// problem too.
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rtp_stream_receiver_ =
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receiver_controller->CreateReceiver(config_.remote_ssrc, this);
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}
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FlexfecReceiveStreamImpl::~FlexfecReceiveStreamImpl() {
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RTC_LOG(LS_INFO) << "~FlexfecReceiveStreamImpl: " << config_.ToString();
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process_thread_->DeRegisterModule(rtp_rtcp_.get());
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}
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void FlexfecReceiveStreamImpl::OnRtpPacket(const RtpPacketReceived& packet) {
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if (!receiver_)
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return;
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receiver_->OnRtpPacket(packet);
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// Do not report media packets in the RTCP RRs generated by |rtp_rtcp_|.
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if (packet.Ssrc() == config_.remote_ssrc) {
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rtp_receive_statistics_->OnRtpPacket(packet);
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}
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}
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// TODO(brandtr): Implement this member function when we have designed the
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// stats for FlexFEC.
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FlexfecReceiveStreamImpl::Stats FlexfecReceiveStreamImpl::GetStats() const {
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return FlexfecReceiveStream::Stats();
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}
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const FlexfecReceiveStream::Config& FlexfecReceiveStreamImpl::GetConfig()
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const {
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return config_;
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}
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} // namespace webrtc
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