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webrtc / src / 3b08fe3dcddf60f92ef3b09d68b2b449994094f3 / . / call / call.cc
blob: 39fb3cfac9a50d8410364a60458b01d4b310e2b8 [file] [log] [blame]
/*
* Copyright (c) 2013 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 "call/call.h"
#include <string.h>
#include <algorithm>
#include <atomic>
#include <map>
#include <memory>
#include <set>
#include <utility>
#include <vector>
#include "absl/functional/bind_front.h"
#include "absl/types/optional.h"
#include "api/rtc_event_log/rtc_event_log.h"
#include "api/sequence_checker.h"
#include "api/transport/network_control.h"
#include "audio/audio_receive_stream.h"
#include "audio/audio_send_stream.h"
#include "audio/audio_state.h"
#include "call/adaptation/broadcast_resource_listener.h"
#include "call/bitrate_allocator.h"
#include "call/flexfec_receive_stream_impl.h"
#include "call/receive_time_calculator.h"
#include "call/rtp_stream_receiver_controller.h"
#include "call/rtp_transport_controller_send.h"
#include "call/rtp_transport_controller_send_factory.h"
#include "call/version.h"
#include "logging/rtc_event_log/events/rtc_event_audio_receive_stream_config.h"
#include "logging/rtc_event_log/events/rtc_event_rtcp_packet_incoming.h"
#include "logging/rtc_event_log/events/rtc_event_rtp_packet_incoming.h"
#include "logging/rtc_event_log/events/rtc_event_video_receive_stream_config.h"
#include "logging/rtc_event_log/events/rtc_event_video_send_stream_config.h"
#include "logging/rtc_event_log/rtc_stream_config.h"
#include "modules/congestion_controller/include/receive_side_congestion_controller.h"
#include "modules/rtp_rtcp/include/flexfec_receiver.h"
#include "modules/rtp_rtcp/include/rtp_header_extension_map.h"
#include "modules/rtp_rtcp/source/byte_io.h"
#include "modules/rtp_rtcp/source/rtp_packet_received.h"
#include "modules/rtp_rtcp/source/rtp_util.h"
#include "modules/utility/include/process_thread.h"
#include "modules/video_coding/fec_controller_default.h"
#include "rtc_base/checks.h"
#include "rtc_base/constructor_magic.h"
#include "rtc_base/location.h"
#include "rtc_base/logging.h"
#include "rtc_base/strings/string_builder.h"
#include "rtc_base/system/no_unique_address.h"
#include "rtc_base/task_utils/pending_task_safety_flag.h"
#include "rtc_base/thread_annotations.h"
#include "rtc_base/time_utils.h"
#include "rtc_base/trace_event.h"
#include "system_wrappers/include/clock.h"
#include "system_wrappers/include/cpu_info.h"
#include "system_wrappers/include/field_trial.h"
#include "system_wrappers/include/metrics.h"
#include "video/call_stats2.h"
#include "video/send_delay_stats.h"
#include "video/stats_counter.h"
#include "video/video_receive_stream2.h"
#include "video/video_send_stream.h"
namespace webrtc {
namespace {
bool SendPeriodicFeedback(const std::vector<RtpExtension>& extensions) {
for (const auto& extension : extensions) {
if (extension.uri == RtpExtension::kTransportSequenceNumberV2Uri)
return false;
}
return true;
}
bool UseSendSideBwe(const ReceiveStream::RtpConfig& rtp) {
if (!rtp.transport_cc)
return false;
for (const auto& extension : rtp.extensions) {
if (extension.uri == RtpExtension::kTransportSequenceNumberUri ||
extension.uri == RtpExtension::kTransportSequenceNumberV2Uri)
return true;
}
return false;
}
const int* FindKeyByValue(const std::map<int, int>& m, int v) {
for (const auto& kv : m) {
if (kv.second == v)
return &kv.first;
}
return nullptr;
}
std::unique_ptr<rtclog::StreamConfig> CreateRtcLogStreamConfig(
const VideoReceiveStream::Config& config) {
auto rtclog_config = std::make_unique<rtclog::StreamConfig>();
rtclog_config->remote_ssrc = config.rtp.remote_ssrc;
rtclog_config->local_ssrc = config.rtp.local_ssrc;
rtclog_config->rtx_ssrc = config.rtp.rtx_ssrc;
rtclog_config->rtcp_mode = config.rtp.rtcp_mode;
rtclog_config->rtp_extensions = config.rtp.extensions;
for (const auto& d : config.decoders) {
const int* search =
FindKeyByValue(config.rtp.rtx_associated_payload_types, d.payload_type);
rtclog_config->codecs.emplace_back(d.video_format.name, d.payload_type,
search ? *search : 0);
}
return rtclog_config;
}
std::unique_ptr<rtclog::StreamConfig> CreateRtcLogStreamConfig(
const VideoSendStream::Config& config,
size_t ssrc_index) {
auto rtclog_config = std::make_unique<rtclog::StreamConfig>();
rtclog_config->local_ssrc = config.rtp.ssrcs[ssrc_index];
if (ssrc_index < config.rtp.rtx.ssrcs.size()) {
rtclog_config->rtx_ssrc = config.rtp.rtx.ssrcs[ssrc_index];
}
rtclog_config->rtcp_mode = config.rtp.rtcp_mode;
rtclog_config->rtp_extensions = config.rtp.extensions;
rtclog_config->codecs.emplace_back(config.rtp.payload_name,
config.rtp.payload_type,
config.rtp.rtx.payload_type);
return rtclog_config;
}
std::unique_ptr<rtclog::StreamConfig> CreateRtcLogStreamConfig(
const AudioReceiveStream::Config& config) {
auto rtclog_config = std::make_unique<rtclog::StreamConfig>();
rtclog_config->remote_ssrc = config.rtp.remote_ssrc;
rtclog_config->local_ssrc = config.rtp.local_ssrc;
rtclog_config->rtp_extensions = config.rtp.extensions;
return rtclog_config;
}
TaskQueueBase* GetCurrentTaskQueueOrThread() {
TaskQueueBase* current = TaskQueueBase::Current();
if (!current)
current = rtc::ThreadManager::Instance()->CurrentThread();
return current;
}
} // namespace
namespace internal {
// Wraps an injected resource in a BroadcastResourceListener and handles adding
// and removing adapter resources to individual VideoSendStreams.
class ResourceVideoSendStreamForwarder {
public:
ResourceVideoSendStreamForwarder(
rtc::scoped_refptr<webrtc::Resource> resource)
: broadcast_resource_listener_(resource) {
broadcast_resource_listener_.StartListening();
}
~ResourceVideoSendStreamForwarder() {
RTC_DCHECK(adapter_resources_.empty());
broadcast_resource_listener_.StopListening();
}
rtc::scoped_refptr<webrtc::Resource> Resource() const {
return broadcast_resource_listener_.SourceResource();
}
void OnCreateVideoSendStream(VideoSendStream* video_send_stream) {
RTC_DCHECK(adapter_resources_.find(video_send_stream) ==
adapter_resources_.end());
auto adapter_resource =
broadcast_resource_listener_.CreateAdapterResource();
video_send_stream->AddAdaptationResource(adapter_resource);
adapter_resources_.insert(
std::make_pair(video_send_stream, adapter_resource));
}
void OnDestroyVideoSendStream(VideoSendStream* video_send_stream) {
auto it = adapter_resources_.find(video_send_stream);
RTC_DCHECK(it != adapter_resources_.end());
broadcast_resource_listener_.RemoveAdapterResource(it->second);
adapter_resources_.erase(it);
}
private:
BroadcastResourceListener broadcast_resource_listener_;
std::map<VideoSendStream*, rtc::scoped_refptr<webrtc::Resource>>
adapter_resources_;
};
class Call final : public webrtc::Call,
public PacketReceiver,
public RecoveredPacketReceiver,
public TargetTransferRateObserver,
public BitrateAllocator::LimitObserver {
public:
Call(Clock* clock,
const Call::Config& config,
std::unique_ptr<RtpTransportControllerSendInterface> transport_send,
rtc::scoped_refptr<SharedModuleThread> module_process_thread,
TaskQueueFactory* task_queue_factory);
~Call() override;
// Implements webrtc::Call.
PacketReceiver* Receiver() override;
webrtc::AudioSendStream* CreateAudioSendStream(
const webrtc::AudioSendStream::Config& config) override;
void DestroyAudioSendStream(webrtc::AudioSendStream* send_stream) override;
webrtc::AudioReceiveStream* CreateAudioReceiveStream(
const webrtc::AudioReceiveStream::Config& config) override;
void DestroyAudioReceiveStream(
webrtc::AudioReceiveStream* receive_stream) override;
webrtc::VideoSendStream* CreateVideoSendStream(
webrtc::VideoSendStream::Config config,
VideoEncoderConfig encoder_config) override;
webrtc::VideoSendStream* CreateVideoSendStream(
webrtc::VideoSendStream::Config config,
VideoEncoderConfig encoder_config,
std::unique_ptr<FecController> fec_controller) override;
void DestroyVideoSendStream(webrtc::VideoSendStream* send_stream) override;
webrtc::VideoReceiveStream* CreateVideoReceiveStream(
webrtc::VideoReceiveStream::Config configuration) override;
void DestroyVideoReceiveStream(
webrtc::VideoReceiveStream* receive_stream) override;
FlexfecReceiveStream* CreateFlexfecReceiveStream(
const FlexfecReceiveStream::Config& config) override;
void DestroyFlexfecReceiveStream(
FlexfecReceiveStream* receive_stream) override;
void AddAdaptationResource(rtc::scoped_refptr<Resource> resource) override;
RtpTransportControllerSendInterface* GetTransportControllerSend() override;
Stats GetStats() const override;
const WebRtcKeyValueConfig& trials() const override;
TaskQueueBase* network_thread() const override;
TaskQueueBase* worker_thread() const override;
// Implements PacketReceiver.
DeliveryStatus DeliverPacket(MediaType media_type,
rtc::CopyOnWriteBuffer packet,
int64_t packet_time_us) override;
// Implements RecoveredPacketReceiver.
void OnRecoveredPacket(const uint8_t* packet, size_t length) override;
void SignalChannelNetworkState(MediaType media, NetworkState state) override;
void OnAudioTransportOverheadChanged(
int transport_overhead_per_packet) override;
void OnLocalSsrcUpdated(webrtc::AudioReceiveStream& stream,
uint32_t local_ssrc) override;
void OnUpdateSyncGroup(webrtc::AudioReceiveStream& stream,
const std::string& sync_group) override;
void OnSentPacket(const rtc::SentPacket& sent_packet) override;
// Implements TargetTransferRateObserver,
void OnTargetTransferRate(TargetTransferRate msg) override;
void OnStartRateUpdate(DataRate start_rate) override;
// Implements BitrateAllocator::LimitObserver.
void OnAllocationLimitsChanged(BitrateAllocationLimits limits) override;
void SetClientBitratePreferences(const BitrateSettings& preferences) override;
private:
// Thread-compatible class that collects received packet stats and exposes
// them as UMA histograms on destruction.
class ReceiveStats {
public:
explicit ReceiveStats(Clock* clock);
~ReceiveStats();
void AddReceivedRtcpBytes(int bytes);
void AddReceivedAudioBytes(int bytes, webrtc::Timestamp arrival_time);
void AddReceivedVideoBytes(int bytes, webrtc::Timestamp arrival_time);
private:
RTC_NO_UNIQUE_ADDRESS SequenceChecker sequence_checker_;
RateCounter received_bytes_per_second_counter_
RTC_GUARDED_BY(sequence_checker_);
RateCounter received_audio_bytes_per_second_counter_
RTC_GUARDED_BY(sequence_checker_);
RateCounter received_video_bytes_per_second_counter_
RTC_GUARDED_BY(sequence_checker_);
RateCounter received_rtcp_bytes_per_second_counter_
RTC_GUARDED_BY(sequence_checker_);
absl::optional<Timestamp> first_received_rtp_audio_timestamp_
RTC_GUARDED_BY(sequence_checker_);
absl::optional<Timestamp> last_received_rtp_audio_timestamp_
RTC_GUARDED_BY(sequence_checker_);
absl::optional<Timestamp> first_received_rtp_video_timestamp_
RTC_GUARDED_BY(sequence_checker_);
absl::optional<Timestamp> last_received_rtp_video_timestamp_
RTC_GUARDED_BY(sequence_checker_);
};
// Thread-compatible class that collects sent packet stats and exposes
// them as UMA histograms on destruction, provided SetFirstPacketTime was
// called with a non-empty packet timestamp before the destructor.
class SendStats {
public:
explicit SendStats(Clock* clock);
~SendStats();
void SetFirstPacketTime(absl::optional<Timestamp> first_sent_packet_time);
void PauseSendAndPacerBitrateCounters();
void AddTargetBitrateSample(uint32_t target_bitrate_bps);
void SetMinAllocatableRate(BitrateAllocationLimits limits);
private:
RTC_NO_UNIQUE_ADDRESS SequenceChecker destructor_sequence_checker_;
RTC_NO_UNIQUE_ADDRESS SequenceChecker sequence_checker_;
Clock* const clock_ RTC_GUARDED_BY(destructor_sequence_checker_);
AvgCounter estimated_send_bitrate_kbps_counter_
RTC_GUARDED_BY(sequence_checker_);
AvgCounter pacer_bitrate_kbps_counter_ RTC_GUARDED_BY(sequence_checker_);
uint32_t min_allocated_send_bitrate_bps_ RTC_GUARDED_BY(sequence_checker_){
0};
absl::optional<Timestamp> first_sent_packet_time_
RTC_GUARDED_BY(destructor_sequence_checker_);
};
void DeliverRtcp(MediaType media_type, rtc::CopyOnWriteBuffer packet)
RTC_RUN_ON(network_thread_);
DeliveryStatus DeliverRtp(MediaType media_type,
rtc::CopyOnWriteBuffer packet,
int64_t packet_time_us) RTC_RUN_ON(worker_thread_);
void ConfigureSync(const std::string& sync_group) RTC_RUN_ON(worker_thread_);
void NotifyBweOfReceivedPacket(const RtpPacketReceived& packet,
MediaType media_type)
RTC_RUN_ON(worker_thread_);
void UpdateAggregateNetworkState();
// Ensure that necessary process threads are started, and any required
// callbacks have been registered.
void EnsureStarted() RTC_RUN_ON(worker_thread_);
Clock* const clock_;
TaskQueueFactory* const task_queue_factory_;
TaskQueueBase* const worker_thread_;
TaskQueueBase* const network_thread_;
RTC_NO_UNIQUE_ADDRESS SequenceChecker send_transport_sequence_checker_;
const int num_cpu_cores_;
const rtc::scoped_refptr<SharedModuleThread> module_process_thread_;
const std::unique_ptr<CallStats> call_stats_;
const std::unique_ptr<BitrateAllocator> bitrate_allocator_;
const Call::Config config_ RTC_GUARDED_BY(worker_thread_);
// Maps to config_.trials, can be used from any thread via `trials()`.
const WebRtcKeyValueConfig& trials_;
NetworkState audio_network_state_ RTC_GUARDED_BY(worker_thread_);
NetworkState video_network_state_ RTC_GUARDED_BY(worker_thread_);
// TODO(bugs.webrtc.org/11993): Move aggregate_network_up_ over to the
// network thread.
bool aggregate_network_up_ RTC_GUARDED_BY(worker_thread_);
// Schedules nack periodic processing on behalf of all streams.
NackPeriodicProcessor nack_periodic_processor_;
// Audio, Video, and FlexFEC receive streams are owned by the client that
// creates them.
// TODO(bugs.webrtc.org/11993): Move audio_receive_streams_,
// video_receive_streams_ and sync_stream_mapping_ over to the network thread.
std::set<AudioReceiveStream*> audio_receive_streams_
RTC_GUARDED_BY(worker_thread_);
std::set<VideoReceiveStream2*> video_receive_streams_
RTC_GUARDED_BY(worker_thread_);
std::map<std::string, AudioReceiveStream*> sync_stream_mapping_
RTC_GUARDED_BY(worker_thread_);
// TODO(nisse): Should eventually be injected at creation,
// with a single object in the bundled case.
RtpStreamReceiverController audio_receiver_controller_
RTC_GUARDED_BY(worker_thread_);
RtpStreamReceiverController video_receiver_controller_
RTC_GUARDED_BY(worker_thread_);
// This extra map is used for receive processing which is
// independent of media type.
// TODO(bugs.webrtc.org/11993): Move receive_rtp_config_ over to the
// network thread.
std::map<uint32_t, ReceiveStream*> receive_rtp_config_
RTC_GUARDED_BY(worker_thread_);
// Audio and Video send streams are owned by the client that creates them.
std::map<uint32_t, AudioSendStream*> audio_send_ssrcs_
RTC_GUARDED_BY(worker_thread_);
std::map<uint32_t, VideoSendStream*> video_send_ssrcs_
RTC_GUARDED_BY(worker_thread_);
std::set<VideoSendStream*> video_send_streams_ RTC_GUARDED_BY(worker_thread_);
// True if `video_send_streams_` is empty, false if not. The atomic variable
// is used to decide UMA send statistics behavior and enables avoiding a
// PostTask().
std::atomic<bool> video_send_streams_empty_{true};
// Each forwarder wraps an adaptation resource that was added to the call.
std::vector<std::unique_ptr<ResourceVideoSendStreamForwarder>>
adaptation_resource_forwarders_ RTC_GUARDED_BY(worker_thread_);
using RtpStateMap = std::map<uint32_t, RtpState>;
RtpStateMap suspended_audio_send_ssrcs_ RTC_GUARDED_BY(worker_thread_);
RtpStateMap suspended_video_send_ssrcs_ RTC_GUARDED_BY(worker_thread_);
using RtpPayloadStateMap = std::map<uint32_t, RtpPayloadState>;
RtpPayloadStateMap suspended_video_payload_states_
RTC_GUARDED_BY(worker_thread_);
webrtc::RtcEventLog* const event_log_;
// TODO(bugs.webrtc.org/11993) ready to move stats access to the network
// thread.
ReceiveStats receive_stats_ RTC_GUARDED_BY(worker_thread_);
SendStats send_stats_ RTC_GUARDED_BY(send_transport_sequence_checker_);
// `last_bandwidth_bps_` and `configured_max_padding_bitrate_bps_` being
// atomic avoids a PostTask. The variables are used for stats gathering.
std::atomic<uint32_t> last_bandwidth_bps_{0};
std::atomic<uint32_t> configured_max_padding_bitrate_bps_{0};
ReceiveSideCongestionController receive_side_cc_;
const std::unique_ptr<ReceiveTimeCalculator> receive_time_calculator_;
const std::unique_ptr<SendDelayStats> video_send_delay_stats_;
const Timestamp start_of_call_;
// Note that `task_safety_` needs to be at a greater scope than the task queue
// owned by `transport_send_` since calls might arrive on the network thread
// while Call is being deleted and the task queue is being torn down.
const ScopedTaskSafety task_safety_;
// Caches transport_send_.get(), to avoid racing with destructor.
// Note that this is declared before transport_send_ to ensure that it is not
// invalidated until no more tasks can be running on the transport_send_ task
// queue.
// For more details on the background of this member variable, see:
// https://webrtc-review.googlesource.com/c/src/+/63023/9/call/call.cc
// https://bugs.chromium.org/p/chromium/issues/detail?id=992640
RtpTransportControllerSendInterface* const transport_send_ptr_
RTC_GUARDED_BY(send_transport_sequence_checker_);
// Declared last since it will issue callbacks from a task queue. Declaring it
// last ensures that it is destroyed first and any running tasks are finished.
const std::unique_ptr<RtpTransportControllerSendInterface> transport_send_;
bool is_started_ RTC_GUARDED_BY(worker_thread_) = false;
RTC_DISALLOW_COPY_AND_ASSIGN(Call);
};
} // namespace internal
std::string Call::Stats::ToString(int64_t time_ms) const {
char buf[1024];
rtc::SimpleStringBuilder ss(buf);
ss << "Call stats: " << time_ms << ", {";
ss << "send_bw_bps: " << send_bandwidth_bps << ", ";
ss << "recv_bw_bps: " << recv_bandwidth_bps << ", ";
ss << "max_pad_bps: " << max_padding_bitrate_bps << ", ";
ss << "pacer_delay_ms: " << pacer_delay_ms << ", ";
ss << "rtt_ms: " << rtt_ms;
ss << '}';
return ss.str();
}
Call* Call::Create(const Call::Config& config) {
rtc::scoped_refptr<SharedModuleThread> call_thread =
SharedModuleThread::Create(ProcessThread::Create("ModuleProcessThread"),
nullptr);
return Create(config, Clock::GetRealTimeClock(), std::move(call_thread),
ProcessThread::Create("PacerThread"));
}
Call* Call::Create(const Call::Config& config,
Clock* clock,
rtc::scoped_refptr<SharedModuleThread> call_thread,
std::unique_ptr<ProcessThread> pacer_thread) {
RTC_DCHECK(config.task_queue_factory);
RtpTransportControllerSendFactory transport_controller_factory_;
RtpTransportConfig transportConfig = config.ExtractTransportConfig();
return new internal::Call(
clock, config,
transport_controller_factory_.Create(transportConfig, clock,
std::move(pacer_thread)),
std::move(call_thread), config.task_queue_factory);
}
Call* Call::Create(const Call::Config& config,
Clock* clock,
rtc::scoped_refptr<SharedModuleThread> call_thread,
std::unique_ptr<RtpTransportControllerSendInterface>
transportControllerSend) {
RTC_DCHECK(config.task_queue_factory);
return new internal::Call(clock, config, std::move(transportControllerSend),
std::move(call_thread), config.task_queue_factory);
}
class SharedModuleThread::Impl {
public:
Impl(std::unique_ptr<ProcessThread> process_thread,
std::function<void()> on_one_ref_remaining)
: module_thread_(std::move(process_thread)),
on_one_ref_remaining_(std::move(on_one_ref_remaining)) {}
void EnsureStarted() {
RTC_DCHECK_RUN_ON(&sequence_checker_);
if (started_)
return;
started_ = true;
module_thread_->Start();
}
ProcessThread* process_thread() {
RTC_DCHECK_RUN_ON(&sequence_checker_);
return module_thread_.get();
}
void AddRef() const {
RTC_DCHECK_RUN_ON(&sequence_checker_);
++ref_count_;
}
rtc::RefCountReleaseStatus Release() const {
RTC_DCHECK_RUN_ON(&sequence_checker_);
--ref_count_;
if (ref_count_ == 0) {
module_thread_->Stop();
return rtc::RefCountReleaseStatus::kDroppedLastRef;
}
if (ref_count_ == 1 && on_one_ref_remaining_) {
auto moved_fn = std::move(on_one_ref_remaining_);
// NOTE: after this function returns, chances are that `this` has been
// deleted - do not touch any member variables.
// If the owner of the last reference implements a lambda that releases
// that last reference inside of the callback (which is legal according
// to this implementation), we will recursively enter Release() above,
// call Stop() and release the last reference.
moved_fn();
}
return rtc::RefCountReleaseStatus::kOtherRefsRemained;
}
private:
RTC_NO_UNIQUE_ADDRESS SequenceChecker sequence_checker_;
mutable int ref_count_ RTC_GUARDED_BY(sequence_checker_) = 0;
std::unique_ptr<ProcessThread> const module_thread_;
std::function<void()> const on_one_ref_remaining_;
bool started_ = false;
};
SharedModuleThread::SharedModuleThread(
std::unique_ptr<ProcessThread> process_thread,
std::function<void()> on_one_ref_remaining)
: impl_(std::make_unique<Impl>(std::move(process_thread),
std::move(on_one_ref_remaining))) {}
SharedModuleThread::~SharedModuleThread() = default;
// static
rtc::scoped_refptr<SharedModuleThread> SharedModuleThread::Create(
std::unique_ptr<ProcessThread> process_thread,
std::function<void()> on_one_ref_remaining) {
return new SharedModuleThread(std::move(process_thread),
std::move(on_one_ref_remaining));
}
void SharedModuleThread::EnsureStarted() {
impl_->EnsureStarted();
}
ProcessThread* SharedModuleThread::process_thread() {
return impl_->process_thread();
}
void SharedModuleThread::AddRef() const {
impl_->AddRef();
}
rtc::RefCountReleaseStatus SharedModuleThread::Release() const {
auto ret = impl_->Release();
if (ret == rtc::RefCountReleaseStatus::kDroppedLastRef)
delete this;
return ret;
}
// This method here to avoid subclasses has to implement this method.
// Call perf test will use Internal::Call::CreateVideoSendStream() to inject
// FecController.
VideoSendStream* Call::CreateVideoSendStream(
VideoSendStream::Config config,
VideoEncoderConfig encoder_config,
std::unique_ptr<FecController> fec_controller) {
return nullptr;
}
namespace internal {
Call::ReceiveStats::ReceiveStats(Clock* clock)
: received_bytes_per_second_counter_(clock, nullptr, false),
received_audio_bytes_per_second_counter_(clock, nullptr, false),
received_video_bytes_per_second_counter_(clock, nullptr, false),
received_rtcp_bytes_per_second_counter_(clock, nullptr, false) {
sequence_checker_.Detach();
}
void Call::ReceiveStats::AddReceivedRtcpBytes(int bytes) {
RTC_DCHECK_RUN_ON(&sequence_checker_);
if (received_bytes_per_second_counter_.HasSample()) {
// First RTP packet has been received.
received_bytes_per_second_counter_.Add(static_cast<int>(bytes));
received_rtcp_bytes_per_second_counter_.Add(static_cast<int>(bytes));
}
}
void Call::ReceiveStats::AddReceivedAudioBytes(int bytes,
webrtc::Timestamp arrival_time) {
RTC_DCHECK_RUN_ON(&sequence_checker_);
received_bytes_per_second_counter_.Add(bytes);
received_audio_bytes_per_second_counter_.Add(bytes);
if (!first_received_rtp_audio_timestamp_)
first_received_rtp_audio_timestamp_ = arrival_time;
last_received_rtp_audio_timestamp_ = arrival_time;
}
void Call::ReceiveStats::AddReceivedVideoBytes(int bytes,
webrtc::Timestamp arrival_time) {
RTC_DCHECK_RUN_ON(&sequence_checker_);
received_bytes_per_second_counter_.Add(bytes);
received_video_bytes_per_second_counter_.Add(bytes);
if (!first_received_rtp_video_timestamp_)
first_received_rtp_video_timestamp_ = arrival_time;
last_received_rtp_video_timestamp_ = arrival_time;
}
Call::ReceiveStats::~ReceiveStats() {
RTC_DCHECK_RUN_ON(&sequence_checker_);
if (first_received_rtp_audio_timestamp_) {
RTC_HISTOGRAM_COUNTS_100000(
"WebRTC.Call.TimeReceivingAudioRtpPacketsInSeconds",
(*last_received_rtp_audio_timestamp_ -
*first_received_rtp_audio_timestamp_)
.seconds());
}
if (first_received_rtp_video_timestamp_) {
RTC_HISTOGRAM_COUNTS_100000(
"WebRTC.Call.TimeReceivingVideoRtpPacketsInSeconds",
(*last_received_rtp_video_timestamp_ -
*first_received_rtp_video_timestamp_)
.seconds());
}
const int kMinRequiredPeriodicSamples = 5;
AggregatedStats video_bytes_per_sec =
received_video_bytes_per_second_counter_.GetStats();
if (video_bytes_per_sec.num_samples > kMinRequiredPeriodicSamples) {
RTC_HISTOGRAM_COUNTS_100000("WebRTC.Call.VideoBitrateReceivedInKbps",
video_bytes_per_sec.average * 8 / 1000);
RTC_LOG(LS_INFO) << "WebRTC.Call.VideoBitrateReceivedInBps, "
<< video_bytes_per_sec.ToStringWithMultiplier(8);
}
AggregatedStats audio_bytes_per_sec =
received_audio_bytes_per_second_counter_.GetStats();
if (audio_bytes_per_sec.num_samples > kMinRequiredPeriodicSamples) {
RTC_HISTOGRAM_COUNTS_100000("WebRTC.Call.AudioBitrateReceivedInKbps",
audio_bytes_per_sec.average * 8 / 1000);
RTC_LOG(LS_INFO) << "WebRTC.Call.AudioBitrateReceivedInBps, "
<< audio_bytes_per_sec.ToStringWithMultiplier(8);
}
AggregatedStats rtcp_bytes_per_sec =
received_rtcp_bytes_per_second_counter_.GetStats();
if (rtcp_bytes_per_sec.num_samples > kMinRequiredPeriodicSamples) {
RTC_HISTOGRAM_COUNTS_100000("WebRTC.Call.RtcpBitrateReceivedInBps",
rtcp_bytes_per_sec.average * 8);
RTC_LOG(LS_INFO) << "WebRTC.Call.RtcpBitrateReceivedInBps, "
<< rtcp_bytes_per_sec.ToStringWithMultiplier(8);
}
AggregatedStats recv_bytes_per_sec =
received_bytes_per_second_counter_.GetStats();
if (recv_bytes_per_sec.num_samples > kMinRequiredPeriodicSamples) {
RTC_HISTOGRAM_COUNTS_100000("WebRTC.Call.BitrateReceivedInKbps",
recv_bytes_per_sec.average * 8 / 1000);
RTC_LOG(LS_INFO) << "WebRTC.Call.BitrateReceivedInBps, "
<< recv_bytes_per_sec.ToStringWithMultiplier(8);
}
}
Call::SendStats::SendStats(Clock* clock)
: clock_(clock),
estimated_send_bitrate_kbps_counter_(clock, nullptr, true),
pacer_bitrate_kbps_counter_(clock, nullptr, true) {
destructor_sequence_checker_.Detach();
sequence_checker_.Detach();
}
Call::SendStats::~SendStats() {
RTC_DCHECK_RUN_ON(&destructor_sequence_checker_);
if (!first_sent_packet_time_)
return;
TimeDelta elapsed = clock_->CurrentTime() - *first_sent_packet_time_;
if (elapsed.seconds() < metrics::kMinRunTimeInSeconds)
return;
const int kMinRequiredPeriodicSamples = 5;
AggregatedStats send_bitrate_stats =
estimated_send_bitrate_kbps_counter_.ProcessAndGetStats();
if (send_bitrate_stats.num_samples > kMinRequiredPeriodicSamples) {
RTC_HISTOGRAM_COUNTS_100000("WebRTC.Call.EstimatedSendBitrateInKbps",
send_bitrate_stats.average);
RTC_LOG(LS_INFO) << "WebRTC.Call.EstimatedSendBitrateInKbps, "
<< send_bitrate_stats.ToString();
}
AggregatedStats pacer_bitrate_stats =
pacer_bitrate_kbps_counter_.ProcessAndGetStats();
if (pacer_bitrate_stats.num_samples > kMinRequiredPeriodicSamples) {
RTC_HISTOGRAM_COUNTS_100000("WebRTC.Call.PacerBitrateInKbps",
pacer_bitrate_stats.average);
RTC_LOG(LS_INFO) << "WebRTC.Call.PacerBitrateInKbps, "
<< pacer_bitrate_stats.ToString();
}
}
void Call::SendStats::SetFirstPacketTime(
absl::optional<Timestamp> first_sent_packet_time) {
RTC_DCHECK_RUN_ON(&destructor_sequence_checker_);
first_sent_packet_time_ = first_sent_packet_time;
}
void Call::SendStats::PauseSendAndPacerBitrateCounters() {
RTC_DCHECK_RUN_ON(&sequence_checker_);
estimated_send_bitrate_kbps_counter_.ProcessAndPause();
pacer_bitrate_kbps_counter_.ProcessAndPause();
}
void Call::SendStats::AddTargetBitrateSample(uint32_t target_bitrate_bps) {
RTC_DCHECK_RUN_ON(&sequence_checker_);
estimated_send_bitrate_kbps_counter_.Add(target_bitrate_bps / 1000);
// Pacer bitrate may be higher than bitrate estimate if enforcing min
// bitrate.
uint32_t pacer_bitrate_bps =
std::max(target_bitrate_bps, min_allocated_send_bitrate_bps_);
pacer_bitrate_kbps_counter_.Add(pacer_bitrate_bps / 1000);
}
void Call::SendStats::SetMinAllocatableRate(BitrateAllocationLimits limits) {
RTC_DCHECK_RUN_ON(&sequence_checker_);
min_allocated_send_bitrate_bps_ = limits.min_allocatable_rate.bps();
}
Call::Call(Clock* clock,
const Call::Config& config,
std::unique_ptr<RtpTransportControllerSendInterface> transport_send,
rtc::scoped_refptr<SharedModuleThread> module_process_thread,
TaskQueueFactory* task_queue_factory)
: clock_(clock),
task_queue_factory_(task_queue_factory),
worker_thread_(GetCurrentTaskQueueOrThread()),
// If `network_task_queue_` was set to nullptr, network related calls
// must be made on `worker_thread_` (i.e. they're one and the same).
network_thread_(config.network_task_queue_ ? config.network_task_queue_
: worker_thread_),
num_cpu_cores_(CpuInfo::DetectNumberOfCores()),
module_process_thread_(std::move(module_process_thread)),
call_stats_(new CallStats(clock_, worker_thread_)),
bitrate_allocator_(new BitrateAllocator(this)),
config_(config),
trials_(*config.trials),
audio_network_state_(kNetworkDown),
video_network_state_(kNetworkDown),
aggregate_network_up_(false),
event_log_(config.event_log),
receive_stats_(clock_),
send_stats_(clock_),
receive_side_cc_(clock,
absl::bind_front(&PacketRouter::SendCombinedRtcpPacket,
transport_send->packet_router()),
absl::bind_front(&PacketRouter::SendRemb,
transport_send->packet_router()),
/*network_state_estimator=*/nullptr),
receive_time_calculator_(ReceiveTimeCalculator::CreateFromFieldTrial()),
video_send_delay_stats_(new SendDelayStats(clock_)),
start_of_call_(clock_->CurrentTime()),
transport_send_ptr_(transport_send.get()),
transport_send_(std::move(transport_send)) {
RTC_DCHECK(config.event_log != nullptr);
RTC_DCHECK(config.trials != nullptr);
RTC_DCHECK(network_thread_);
RTC_DCHECK(worker_thread_->IsCurrent());
send_transport_sequence_checker_.Detach();
// Do not remove this call; it is here to convince the compiler that the
// WebRTC source timestamp string needs to be in the final binary.
LoadWebRTCVersionInRegister();
call_stats_->RegisterStatsObserver(&receive_side_cc_);
module_process_thread_->process_thread()->RegisterModule(
receive_side_cc_.GetRemoteBitrateEstimator(true), RTC_FROM_HERE);
module_process_thread_->process_thread()->RegisterModule(&receive_side_cc_,
RTC_FROM_HERE);
}
Call::~Call() {
RTC_DCHECK_RUN_ON(worker_thread_);
RTC_CHECK(audio_send_ssrcs_.empty());
RTC_CHECK(video_send_ssrcs_.empty());
RTC_CHECK(video_send_streams_.empty());
RTC_CHECK(audio_receive_streams_.empty());
RTC_CHECK(video_receive_streams_.empty());
module_process_thread_->process_thread()->DeRegisterModule(
receive_side_cc_.GetRemoteBitrateEstimator(true));
module_process_thread_->process_thread()->DeRegisterModule(&receive_side_cc_);
call_stats_->DeregisterStatsObserver(&receive_side_cc_);
send_stats_.SetFirstPacketTime(transport_send_->GetFirstPacketTime());
RTC_HISTOGRAM_COUNTS_100000(
"WebRTC.Call.LifetimeInSeconds",
(clock_->CurrentTime() - start_of_call_).seconds());
}
void Call::EnsureStarted() {
if (is_started_) {
return;
}
is_started_ = true;
call_stats_->EnsureStarted();
// This call seems to kick off a number of things, so probably better left
// off being kicked off on request rather than in the ctor.
transport_send_->RegisterTargetTransferRateObserver(this);
module_process_thread_->EnsureStarted();
transport_send_->EnsureStarted();
}
void Call::SetClientBitratePreferences(const BitrateSettings& preferences) {
RTC_DCHECK_RUN_ON(worker_thread_);
GetTransportControllerSend()->SetClientBitratePreferences(preferences);
}
PacketReceiver* Call::Receiver() {
return this;
}
webrtc::AudioSendStream* Call::CreateAudioSendStream(
const webrtc::AudioSendStream::Config& config) {
TRACE_EVENT0("webrtc", "Call::CreateAudioSendStream");
RTC_DCHECK_RUN_ON(worker_thread_);
EnsureStarted();
// Stream config is logged in AudioSendStream::ConfigureStream, as it may
// change during the stream's lifetime.
absl::optional<RtpState> suspended_rtp_state;
{
const auto& iter = suspended_audio_send_ssrcs_.find(config.rtp.ssrc);
if (iter != suspended_audio_send_ssrcs_.end()) {
suspended_rtp_state.emplace(iter->second);
}
}
AudioSendStream* send_stream = new AudioSendStream(
clock_, config, config_.audio_state, task_queue_factory_,
transport_send_.get(), bitrate_allocator_.get(), event_log_,
call_stats_->AsRtcpRttStats(), suspended_rtp_state);
RTC_DCHECK(audio_send_ssrcs_.find(config.rtp.ssrc) ==
audio_send_ssrcs_.end());
audio_send_ssrcs_[config.rtp.ssrc] = send_stream;
// TODO(bugs.webrtc.org/11993): call AssociateSendStream and
// UpdateAggregateNetworkState asynchronously on the network thread.
for (AudioReceiveStream* stream : audio_receive_streams_) {
if (stream->local_ssrc() == config.rtp.ssrc) {
stream->AssociateSendStream(send_stream);
}
}
UpdateAggregateNetworkState();
return send_stream;
}
void Call::DestroyAudioSendStream(webrtc::AudioSendStream* send_stream) {
TRACE_EVENT0("webrtc", "Call::DestroyAudioSendStream");
RTC_DCHECK_RUN_ON(worker_thread_);
RTC_DCHECK(send_stream != nullptr);
send_stream->Stop();
const uint32_t ssrc = send_stream->GetConfig().rtp.ssrc;
webrtc::internal::AudioSendStream* audio_send_stream =
static_cast<webrtc::internal::AudioSendStream*>(send_stream);
suspended_audio_send_ssrcs_[ssrc] = audio_send_stream->GetRtpState();
size_t num_deleted = audio_send_ssrcs_.erase(ssrc);
RTC_DCHECK_EQ(1, num_deleted);
// TODO(bugs.webrtc.org/11993): call AssociateSendStream and
// UpdateAggregateNetworkState asynchronously on the network thread.
for (AudioReceiveStream* stream : audio_receive_streams_) {
if (stream->local_ssrc() == ssrc) {
stream->AssociateSendStream(nullptr);
}
}
UpdateAggregateNetworkState();
delete send_stream;
}
webrtc::AudioReceiveStream* Call::CreateAudioReceiveStream(
const webrtc::AudioReceiveStream::Config& config) {
TRACE_EVENT0("webrtc", "Call::CreateAudioReceiveStream");
RTC_DCHECK_RUN_ON(worker_thread_);
EnsureStarted();
event_log_->Log(std::make_unique<RtcEventAudioReceiveStreamConfig>(
CreateRtcLogStreamConfig(config)));
AudioReceiveStream* receive_stream = new AudioReceiveStream(
clock_, transport_send_->packet_router(), config_.neteq_factory, config,
config_.audio_state, event_log_);
audio_receive_streams_.insert(receive_stream);
// TODO(bugs.webrtc.org/11993): Make the registration on the network thread
// (asynchronously). The registration and `audio_receiver_controller_` need
// to live on the network thread.
receive_stream->RegisterWithTransport(&audio_receiver_controller_);
// TODO(bugs.webrtc.org/11993): Update the below on the network thread.
// We could possibly set up the audio_receiver_controller_ association up
// as part of the async setup.
receive_rtp_config_.emplace(config.rtp.remote_ssrc, receive_stream);
ConfigureSync(config.sync_group);
auto it = audio_send_ssrcs_.find(config.rtp.local_ssrc);
if (it != audio_send_ssrcs_.end()) {
receive_stream->AssociateSendStream(it->second);
}
UpdateAggregateNetworkState();
return receive_stream;
}
void Call::DestroyAudioReceiveStream(
webrtc::AudioReceiveStream* receive_stream) {
TRACE_EVENT0("webrtc", "Call::DestroyAudioReceiveStream");
RTC_DCHECK_RUN_ON(worker_thread_);
RTC_DCHECK(receive_stream != nullptr);
webrtc::internal::AudioReceiveStream* audio_receive_stream =
static_cast<webrtc::internal::AudioReceiveStream*>(receive_stream);
// TODO(bugs.webrtc.org/11993): Access the map, rtp config, call ConfigureSync
// and UpdateAggregateNetworkState on the network thread. The call to
// `UnregisterFromTransport` should also happen on the network thread.
audio_receive_stream->UnregisterFromTransport();
uint32_t ssrc = audio_receive_stream->remote_ssrc();
const AudioReceiveStream::Config& config = audio_receive_stream->config();
receive_side_cc_.GetRemoteBitrateEstimator(UseSendSideBwe(config.rtp))
->RemoveStream(ssrc);
audio_receive_streams_.erase(audio_receive_stream);
const auto it = sync_stream_mapping_.find(config.sync_group);
if (it != sync_stream_mapping_.end() && it->second == audio_receive_stream) {
sync_stream_mapping_.erase(it);
ConfigureSync(config.sync_group);
}
receive_rtp_config_.erase(ssrc);
UpdateAggregateNetworkState();
// TODO(bugs.webrtc.org/11993): Consider if deleting `audio_receive_stream`
// on the network thread would be better or if we'd need to tear down the
// state in two phases.
delete audio_receive_stream;
}
// This method can be used for Call tests with external fec controller factory.
webrtc::VideoSendStream* Call::CreateVideoSendStream(
webrtc::VideoSendStream::Config config,
VideoEncoderConfig encoder_config,
std::unique_ptr<FecController> fec_controller) {
TRACE_EVENT0("webrtc", "Call::CreateVideoSendStream");
RTC_DCHECK_RUN_ON(worker_thread_);
EnsureStarted();
video_send_delay_stats_->AddSsrcs(config);
for (size_t ssrc_index = 0; ssrc_index < config.rtp.ssrcs.size();
++ssrc_index) {
event_log_->Log(std::make_unique<RtcEventVideoSendStreamConfig>(
CreateRtcLogStreamConfig(config, ssrc_index)));
}
// TODO(mflodman): Base the start bitrate on a current bandwidth estimate, if
// the call has already started.
// Copy ssrcs from `config` since `config` is moved.
std::vector<uint32_t> ssrcs = config.rtp.ssrcs;
VideoSendStream* send_stream = new VideoSendStream(
clock_, num_cpu_cores_, task_queue_factory_,
call_stats_->AsRtcpRttStats(), transport_send_.get(),
bitrate_allocator_.get(), video_send_delay_stats_.get(), event_log_,
std::move(config), std::move(encoder_config), suspended_video_send_ssrcs_,
suspended_video_payload_states_, std::move(fec_controller));
for (uint32_t ssrc : ssrcs) {
RTC_DCHECK(video_send_ssrcs_.find(ssrc) == video_send_ssrcs_.end());
video_send_ssrcs_[ssrc] = send_stream;
}
video_send_streams_.insert(send_stream);
video_send_streams_empty_.store(false, std::memory_order_relaxed);
// Forward resources that were previously added to the call to the new stream.
for (const auto& resource_forwarder : adaptation_resource_forwarders_) {
resource_forwarder->OnCreateVideoSendStream(send_stream);
}
UpdateAggregateNetworkState();
return send_stream;
}
webrtc::VideoSendStream* Call::CreateVideoSendStream(
webrtc::VideoSendStream::Config config,
VideoEncoderConfig encoder_config) {
RTC_DCHECK_RUN_ON(worker_thread_);
if (config_.fec_controller_factory) {
RTC_LOG(LS_INFO) << "External FEC Controller will be used.";
}
std::unique_ptr<FecController> fec_controller =
config_.fec_controller_factory
? config_.fec_controller_factory->CreateFecController()
: std::make_unique<FecControllerDefault>(clock_);
return CreateVideoSendStream(std::move(config), std::move(encoder_config),
std::move(fec_controller));
}
void Call::DestroyVideoSendStream(webrtc::VideoSendStream* send_stream) {
TRACE_EVENT0("webrtc", "Call::DestroyVideoSendStream");
RTC_DCHECK(send_stream != nullptr);
RTC_DCHECK_RUN_ON(worker_thread_);
VideoSendStream* send_stream_impl =
static_cast<VideoSendStream*>(send_stream);
VideoSendStream::RtpStateMap rtp_states;
VideoSendStream::RtpPayloadStateMap rtp_payload_states;
send_stream_impl->StopPermanentlyAndGetRtpStates(&rtp_states,
&rtp_payload_states);
auto it = video_send_ssrcs_.begin();
while (it != video_send_ssrcs_.end()) {
if (it->second == static_cast<VideoSendStream*>(send_stream)) {
send_stream_impl = it->second;
video_send_ssrcs_.erase(it++);
} else {
++it;
}
}
// Stop forwarding resources to the stream being destroyed.
for (const auto& resource_forwarder : adaptation_resource_forwarders_) {
resource_forwarder->OnDestroyVideoSendStream(send_stream_impl);
}
video_send_streams_.erase(send_stream_impl);
if (video_send_streams_.empty())
video_send_streams_empty_.store(true, std::memory_order_relaxed);
for (const auto& kv : rtp_states) {
suspended_video_send_ssrcs_[kv.first] = kv.second;
}
for (const auto& kv : rtp_payload_states) {
suspended_video_payload_states_[kv.first] = kv.second;
}
UpdateAggregateNetworkState();
// TODO(tommi): consider deleting on the same thread as runs
// StopPermanentlyAndGetRtpStates.
delete send_stream_impl;
}
webrtc::VideoReceiveStream* Call::CreateVideoReceiveStream(
webrtc::VideoReceiveStream::Config configuration) {
TRACE_EVENT0("webrtc", "Call::CreateVideoReceiveStream");
RTC_DCHECK_RUN_ON(worker_thread_);
receive_side_cc_.SetSendPeriodicFeedback(
SendPeriodicFeedback(configuration.rtp.extensions));
EnsureStarted();
event_log_->Log(std::make_unique<RtcEventVideoReceiveStreamConfig>(
CreateRtcLogStreamConfig(configuration)));
// TODO(bugs.webrtc.org/11993): Move the registration between `receive_stream`
// and `video_receiver_controller_` out of VideoReceiveStream2 construction
// and set it up asynchronously on the network thread (the registration and
// `video_receiver_controller_` need to live on the network thread).
VideoReceiveStream2* receive_stream = new VideoReceiveStream2(
task_queue_factory_, this, num_cpu_cores_,
transport_send_->packet_router(), std::move(configuration),
call_stats_.get(), clock_, new VCMTiming(clock_),
&nack_periodic_processor_);
// TODO(bugs.webrtc.org/11993): Set this up asynchronously on the network
// thread.
receive_stream->RegisterWithTransport(&video_receiver_controller_);
const webrtc::VideoReceiveStream::Config::Rtp& rtp = receive_stream->rtp();
if (rtp.rtx_ssrc) {
// We record identical config for the rtx stream as for the main
// stream. Since the transport_send_cc negotiation is per payload
// type, we may get an incorrect value for the rtx stream, but
// that is unlikely to matter in practice.
receive_rtp_config_.emplace(rtp.rtx_ssrc, receive_stream);
}
receive_rtp_config_.emplace(rtp.remote_ssrc, receive_stream);
video_receive_streams_.insert(receive_stream);
ConfigureSync(receive_stream->sync_group());
receive_stream->SignalNetworkState(video_network_state_);
UpdateAggregateNetworkState();
return receive_stream;
}
void Call::DestroyVideoReceiveStream(
webrtc::VideoReceiveStream* receive_stream) {
TRACE_EVENT0("webrtc", "Call::DestroyVideoReceiveStream");
RTC_DCHECK_RUN_ON(worker_thread_);
RTC_DCHECK(receive_stream != nullptr);
VideoReceiveStream2* receive_stream_impl =
static_cast<VideoReceiveStream2*>(receive_stream);
// TODO(bugs.webrtc.org/11993): Unregister on the network thread.
receive_stream_impl->UnregisterFromTransport();
const webrtc::VideoReceiveStream::Config::Rtp& rtp =
receive_stream_impl->rtp();
// Remove all ssrcs pointing to a receive stream. As RTX retransmits on a
// separate SSRC there can be either one or two.
receive_rtp_config_.erase(rtp.remote_ssrc);
if (rtp.rtx_ssrc) {
receive_rtp_config_.erase(rtp.rtx_ssrc);
}
video_receive_streams_.erase(receive_stream_impl);
ConfigureSync(receive_stream_impl->sync_group());
receive_side_cc_.GetRemoteBitrateEstimator(UseSendSideBwe(rtp))
->RemoveStream(rtp.remote_ssrc);
UpdateAggregateNetworkState();
delete receive_stream_impl;
}
FlexfecReceiveStream* Call::CreateFlexfecReceiveStream(
const FlexfecReceiveStream::Config& config) {
TRACE_EVENT0("webrtc", "Call::CreateFlexfecReceiveStream");
RTC_DCHECK_RUN_ON(worker_thread_);
RecoveredPacketReceiver* recovered_packet_receiver = this;
FlexfecReceiveStreamImpl* receive_stream;
// Unlike the video and audio receive streams, FlexfecReceiveStream implements
// RtpPacketSinkInterface itself, and hence its constructor passes its `this`
// pointer to video_receiver_controller_->CreateStream(). Calling the
// constructor while on the worker thread ensures that we don't call
// OnRtpPacket until the constructor is finished and the object is
// in a valid state, since OnRtpPacket runs on the same thread.
receive_stream = new FlexfecReceiveStreamImpl(
clock_, config, recovered_packet_receiver, call_stats_->AsRtcpRttStats());
// TODO(bugs.webrtc.org/11993): Set this up asynchronously on the network
// thread.
receive_stream->RegisterWithTransport(&video_receiver_controller_);
RTC_DCHECK(receive_rtp_config_.find(config.rtp.remote_ssrc) ==
receive_rtp_config_.end());
receive_rtp_config_.emplace(config.rtp.remote_ssrc, receive_stream);
// TODO(brandtr): Store config in RtcEventLog here.
return receive_stream;
}
void Call::DestroyFlexfecReceiveStream(FlexfecReceiveStream* receive_stream) {
TRACE_EVENT0("webrtc", "Call::DestroyFlexfecReceiveStream");
RTC_DCHECK_RUN_ON(worker_thread_);
FlexfecReceiveStreamImpl* receive_stream_impl =
static_cast<FlexfecReceiveStreamImpl*>(receive_stream);
// TODO(bugs.webrtc.org/11993): Unregister on the network thread.
receive_stream_impl->UnregisterFromTransport();
RTC_DCHECK(receive_stream != nullptr);
const FlexfecReceiveStream::RtpConfig& rtp = receive_stream->rtp_config();
receive_rtp_config_.erase(rtp.remote_ssrc);
// Remove all SSRCs pointing to the FlexfecReceiveStreamImpl to be
// destroyed.
receive_side_cc_.GetRemoteBitrateEstimator(UseSendSideBwe(rtp))
->RemoveStream(rtp.remote_ssrc);
delete receive_stream;
}
void Call::AddAdaptationResource(rtc::scoped_refptr<Resource> resource) {
RTC_DCHECK_RUN_ON(worker_thread_);
adaptation_resource_forwarders_.push_back(
std::make_unique<ResourceVideoSendStreamForwarder>(resource));
const auto& resource_forwarder = adaptation_resource_forwarders_.back();
for (VideoSendStream* send_stream : video_send_streams_) {
resource_forwarder->OnCreateVideoSendStream(send_stream);
}
}
RtpTransportControllerSendInterface* Call::GetTransportControllerSend() {
return transport_send_.get();
}
Call::Stats Call::GetStats() const {
RTC_DCHECK_RUN_ON(worker_thread_);
Stats stats;
// TODO(srte): It is unclear if we only want to report queues if network is
// available.
stats.pacer_delay_ms =
aggregate_network_up_ ? transport_send_->GetPacerQueuingDelayMs() : 0;
stats.rtt_ms = call_stats_->LastProcessedRtt();
// Fetch available send/receive bitrates.
std::vector<unsigned int> ssrcs;
uint32_t recv_bandwidth = 0;
receive_side_cc_.GetRemoteBitrateEstimator(false)->LatestEstimate(
&ssrcs, &recv_bandwidth);
stats.recv_bandwidth_bps = recv_bandwidth;
stats.send_bandwidth_bps =
last_bandwidth_bps_.load(std::memory_order_relaxed);
stats.max_padding_bitrate_bps =
configured_max_padding_bitrate_bps_.load(std::memory_order_relaxed);
return stats;
}
const WebRtcKeyValueConfig& Call::trials() const {
return trials_;
}
TaskQueueBase* Call::network_thread() const {
return network_thread_;
}
TaskQueueBase* Call::worker_thread() const {
return worker_thread_;
}
void Call::SignalChannelNetworkState(MediaType media, NetworkState state) {
RTC_DCHECK_RUN_ON(network_thread_);
RTC_DCHECK(media == MediaType::AUDIO || media == MediaType::VIDEO);
auto closure = [this, media, state]() {
// TODO(bugs.webrtc.org/11993): Move this over to the network thread.
RTC_DCHECK_RUN_ON(worker_thread_);
if (media == MediaType::AUDIO) {
audio_network_state_ = state;
} else {
RTC_DCHECK_EQ(media, MediaType::VIDEO);
video_network_state_ = state;
}
// TODO(tommi): Is it necessary to always do this, including if there
// was no change in state?
UpdateAggregateNetworkState();
// TODO(tommi): Is it right to do this if media == AUDIO?
for (VideoReceiveStream2* video_receive_stream : video_receive_streams_) {
video_receive_stream->SignalNetworkState(video_network_state_);
}
};
if (network_thread_ == worker_thread_) {
closure();
} else {
// TODO(bugs.webrtc.org/11993): Remove workaround when we no longer need to
// post to the worker thread.
worker_thread_->PostTask(ToQueuedTask(task_safety_, std::move(closure)));
}
}
void Call::OnAudioTransportOverheadChanged(int transport_overhead_per_packet) {
RTC_DCHECK_RUN_ON(network_thread_);
worker_thread_->PostTask(
ToQueuedTask(task_safety_, [this, transport_overhead_per_packet]() {
// TODO(bugs.webrtc.org/11993): Move this over to the network thread.
RTC_DCHECK_RUN_ON(worker_thread_);
for (auto& kv : audio_send_ssrcs_) {
kv.second->SetTransportOverhead(transport_overhead_per_packet);
}
}));
}
void Call::UpdateAggregateNetworkState() {
// TODO(bugs.webrtc.org/11993): Move this over to the network thread.
// RTC_DCHECK_RUN_ON(network_thread_);
RTC_DCHECK_RUN_ON(worker_thread_);
bool have_audio =
!audio_send_ssrcs_.empty() || !audio_receive_streams_.empty();
bool have_video =
!video_send_ssrcs_.empty() || !video_receive_streams_.empty();
bool aggregate_network_up =
((have_video && video_network_state_ == kNetworkUp) ||
(have_audio && audio_network_state_ == kNetworkUp));
if (aggregate_network_up != aggregate_network_up_) {
RTC_LOG(LS_INFO)
<< "UpdateAggregateNetworkState: aggregate_state change to "
<< (aggregate_network_up ? "up" : "down");
} else {
RTC_LOG(LS_VERBOSE)
<< "UpdateAggregateNetworkState: aggregate_state remains at "
<< (aggregate_network_up ? "up" : "down");
}
aggregate_network_up_ = aggregate_network_up;
transport_send_->OnNetworkAvailability(aggregate_network_up);
}
void Call::OnLocalSsrcUpdated(webrtc::AudioReceiveStream& stream,
uint32_t local_ssrc) {
RTC_DCHECK_RUN_ON(worker_thread_);
webrtc::internal::AudioReceiveStream& receive_stream =
static_cast<webrtc::internal::AudioReceiveStream&>(stream);
receive_stream.SetLocalSsrc(local_ssrc);
auto it = audio_send_ssrcs_.find(local_ssrc);
receive_stream.AssociateSendStream(it != audio_send_ssrcs_.end() ? it->second
: nullptr);
}
void Call::OnUpdateSyncGroup(webrtc::AudioReceiveStream& stream,
const std::string& sync_group) {
RTC_DCHECK_RUN_ON(worker_thread_);
webrtc::internal::AudioReceiveStream& receive_stream =
static_cast<webrtc::internal::AudioReceiveStream&>(stream);
receive_stream.SetSyncGroup(sync_group);
ConfigureSync(sync_group);
}
void Call::OnSentPacket(const rtc::SentPacket& sent_packet) {
// In production and with most tests, this method will be called on the
// network thread. However some test classes such as DirectTransport don't
// incorporate a network thread. This means that tests for RtpSenderEgress
// and ModuleRtpRtcpImpl2 that use DirectTransport, will call this method
// on a ProcessThread. This is alright as is since we forward the call to
// implementations that either just do a PostTask or use locking.
video_send_delay_stats_->OnSentPacket(sent_packet.packet_id,
clock_->TimeInMilliseconds());
transport_send_->OnSentPacket(sent_packet);
}
void Call::OnStartRateUpdate(DataRate start_rate) {
RTC_DCHECK_RUN_ON(&send_transport_sequence_checker_);
bitrate_allocator_->UpdateStartRate(start_rate.bps<uint32_t>());
}
void Call::OnTargetTransferRate(TargetTransferRate msg) {
RTC_DCHECK_RUN_ON(&send_transport_sequence_checker_);
uint32_t target_bitrate_bps = msg.target_rate.bps();
// For controlling the rate of feedback messages.
receive_side_cc_.OnBitrateChanged(target_bitrate_bps);
bitrate_allocator_->OnNetworkEstimateChanged(msg);
last_bandwidth_bps_.store(target_bitrate_bps, std::memory_order_relaxed);
// Ignore updates if bitrate is zero (the aggregate network state is
// down) or if we're not sending video.
// Using `video_send_streams_empty_` is racy but as the caller can't
// reasonably expect synchronize with changes in `video_send_streams_` (being
// on `send_transport_sequence_checker`), we can avoid a PostTask this way.
if (target_bitrate_bps == 0 ||
video_send_streams_empty_.load(std::memory_order_relaxed)) {
send_stats_.PauseSendAndPacerBitrateCounters();
} else {
send_stats_.AddTargetBitrateSample(target_bitrate_bps);
}
}
void Call::OnAllocationLimitsChanged(BitrateAllocationLimits limits) {
RTC_DCHECK_RUN_ON(&send_transport_sequence_checker_);
transport_send_ptr_->SetAllocatedSendBitrateLimits(limits);
send_stats_.SetMinAllocatableRate(limits);
configured_max_padding_bitrate_bps_.store(limits.max_padding_rate.bps(),
std::memory_order_relaxed);
}
// RTC_RUN_ON(worker_thread_)
void Call::ConfigureSync(const std::string& sync_group) {
// TODO(bugs.webrtc.org/11993): Expect to be called on the network thread.
// Set sync only if there was no previous one.
if (sync_group.empty())
return;
AudioReceiveStream* sync_audio_stream = nullptr;
// Find existing audio stream.
const auto it = sync_stream_mapping_.find(sync_group);
if (it != sync_stream_mapping_.end()) {
sync_audio_stream = it->second;
} else {
// No configured audio stream, see if we can find one.
for (AudioReceiveStream* stream : audio_receive_streams_) {
if (stream->config().sync_group == sync_group) {
if (sync_audio_stream != nullptr) {
RTC_LOG(LS_WARNING)
<< "Attempting to sync more than one audio stream "
"within the same sync group. This is not "
"supported in the current implementation.";
break;
}
sync_audio_stream = stream;
}
}
}
if (sync_audio_stream)
sync_stream_mapping_[sync_group] = sync_audio_stream;
size_t num_synced_streams = 0;
for (VideoReceiveStream2* video_stream : video_receive_streams_) {
if (video_stream->sync_group() != sync_group)
continue;
++num_synced_streams;
if (num_synced_streams > 1) {
// TODO(pbos): Support synchronizing more than one A/V pair.
// https://code.google.com/p/webrtc/issues/detail?id=4762
RTC_LOG(LS_WARNING)
<< "Attempting to sync more than one audio/video pair "
"within the same sync group. This is not supported in "
"the current implementation.";
}
// Only sync the first A/V pair within this sync group.
if (num_synced_streams == 1) {
// sync_audio_stream may be null and that's ok.
video_stream->SetSync(sync_audio_stream);
} else {
video_stream->SetSync(nullptr);
}
}
}
// RTC_RUN_ON(network_thread_)
void Call::DeliverRtcp(MediaType media_type, rtc::CopyOnWriteBuffer packet) {
TRACE_EVENT0("webrtc", "Call::DeliverRtcp");
// TODO(bugs.webrtc.org/11993): This DCHECK is here just to maintain the
// invariant that currently the only call path to this function is via
// `PeerConnection::InitializeRtcpCallback()`. DeliverRtp on the other hand
// gets called via the channel classes and
// WebRtc[Audio|Video]Channel's `OnPacketReceived`. We'll remove the
// PeerConnection involvement as well as
// `JsepTransportController::OnRtcpPacketReceived_n` and `rtcp_handler`
// and make sure that the flow of packets is consistent from the
// `RtpTransport` class, via the *Channel and *Engine classes and into Call.
// This way we'll also know more about the context of the packet.
RTC_DCHECK_EQ(media_type, MediaType::ANY);
// TODO(bugs.webrtc.org/11993): This should execute directly on the network
// thread.
worker_thread_->PostTask(
ToQueuedTask(task_safety_, [this, packet = std::move(packet)]() {
RTC_DCHECK_RUN_ON(worker_thread_);
receive_stats_.AddReceivedRtcpBytes(static_cast<int>(packet.size()));
bool rtcp_delivered = false;
for (VideoReceiveStream2* stream : video_receive_streams_) {
if (stream->DeliverRtcp(packet.cdata(), packet.size()))
rtcp_delivered = true;
}
for (AudioReceiveStream* stream : audio_receive_streams_) {
stream->DeliverRtcp(packet.cdata(), packet.size());
rtcp_delivered = true;
}
for (VideoSendStream* stream : video_send_streams_) {
stream->DeliverRtcp(packet.cdata(), packet.size());
rtcp_delivered = true;
}
for (auto& kv : audio_send_ssrcs_) {
kv.second->DeliverRtcp(packet.cdata(), packet.size());
rtcp_delivered = true;
}
if (rtcp_delivered) {
event_log_->Log(std::make_unique<RtcEventRtcpPacketIncoming>(
rtc::MakeArrayView(packet.cdata(), packet.size())));
}
}));
}
PacketReceiver::DeliveryStatus Call::DeliverRtp(MediaType media_type,
rtc::CopyOnWriteBuffer packet,
int64_t packet_time_us) {
TRACE_EVENT0("webrtc", "Call::DeliverRtp");
RTC_DCHECK_NE(media_type, MediaType::ANY);
RtpPacketReceived parsed_packet;
if (!parsed_packet.Parse(std::move(packet)))
return DELIVERY_PACKET_ERROR;
if (packet_time_us != -1) {
if (receive_time_calculator_) {
// Repair packet_time_us for clock resets by comparing a new read of
// the same clock (TimeUTCMicros) to a monotonic clock reading.
packet_time_us = receive_time_calculator_->ReconcileReceiveTimes(
packet_time_us, rtc::TimeUTCMicros(), clock_->TimeInMicroseconds());
}
parsed_packet.set_arrival_time(Timestamp::Micros(packet_time_us));
} else {
parsed_packet.set_arrival_time(clock_->CurrentTime());
}
// We might get RTP keep-alive packets in accordance with RFC6263 section 4.6.
// These are empty (zero length payload) RTP packets with an unsignaled
// payload type.
const bool is_keep_alive_packet = parsed_packet.payload_size() == 0;
RTC_DCHECK(media_type == MediaType::AUDIO || media_type == MediaType::VIDEO ||
is_keep_alive_packet);
auto it = receive_rtp_config_.find(parsed_packet.Ssrc());
if (it == receive_rtp_config_.end()) {
RTC_LOG(LS_ERROR) << "receive_rtp_config_ lookup failed for ssrc "
<< parsed_packet.Ssrc();
// Destruction of the receive stream, including deregistering from the
// RtpDemuxer, is not protected by the `worker_thread_`.
// But deregistering in the `receive_rtp_config_` map is. So by not passing
// the packet on to demuxing in this case, we prevent incoming packets to be
// passed on via the demuxer to a receive stream which is being torned down.
return DELIVERY_UNKNOWN_SSRC;
}
parsed_packet.IdentifyExtensions(
RtpHeaderExtensionMap(it->second->rtp_config().extensions));
NotifyBweOfReceivedPacket(parsed_packet, media_type);
// RateCounters expect input parameter as int, save it as int,
// instead of converting each time it is passed to RateCounter::Add below.
int length = static_cast<int>(parsed_packet.size());
if (media_type == MediaType::AUDIO) {
if (audio_receiver_controller_.OnRtpPacket(parsed_packet)) {
receive_stats_.AddReceivedAudioBytes(length,
parsed_packet.arrival_time());
event_log_->Log(
std::make_unique<RtcEventRtpPacketIncoming>(parsed_packet));
return DELIVERY_OK;
}
} else if (media_type == MediaType::VIDEO) {
parsed_packet.set_payload_type_frequency(kVideoPayloadTypeFrequency);
if (video_receiver_controller_.OnRtpPacket(parsed_packet)) {
receive_stats_.AddReceivedVideoBytes(length,
parsed_packet.arrival_time());
event_log_->Log(
std::make_unique<RtcEventRtpPacketIncoming>(parsed_packet));
return DELIVERY_OK;
}
}
return DELIVERY_UNKNOWN_SSRC;
}
PacketReceiver::DeliveryStatus Call::DeliverPacket(
MediaType media_type,
rtc::CopyOnWriteBuffer packet,
int64_t packet_time_us) {
if (IsRtcpPacket(packet)) {
RTC_DCHECK_RUN_ON(network_thread_);
DeliverRtcp(media_type, std::move(packet));
return DELIVERY_OK;
}
RTC_DCHECK_RUN_ON(worker_thread_);
return DeliverRtp(media_type, std::move(packet), packet_time_us);
}
void Call::OnRecoveredPacket(const uint8_t* packet, size_t length) {
// TODO(bugs.webrtc.org/11993): Expect to be called on the network thread.
// This method is called synchronously via `OnRtpPacket()` (see DeliverRtp)
// on the same thread.
RTC_DCHECK_RUN_ON(worker_thread_);
RtpPacketReceived parsed_packet;
if (!parsed_packet.Parse(packet, length))
return;
parsed_packet.set_recovered(true);
auto it = receive_rtp_config_.find(parsed_packet.Ssrc());
if (it == receive_rtp_config_.end()) {
RTC_LOG(LS_ERROR) << "receive_rtp_config_ lookup failed for ssrc "
<< parsed_packet.Ssrc();
// Destruction of the receive stream, including deregistering from the
// RtpDemuxer, is not protected by the `worker_thread_`.
// But deregistering in the `receive_rtp_config_` map is.
// So by not passing the packet on to demuxing in this case, we prevent
// incoming packets to be passed on via the demuxer to a receive stream
// which is being torn down.
return;
}
parsed_packet.IdentifyExtensions(
RtpHeaderExtensionMap(it->second->rtp_config().extensions));
// TODO(brandtr): Update here when we support protecting audio packets too.
parsed_packet.set_payload_type_frequency(kVideoPayloadTypeFrequency);
video_receiver_controller_.OnRtpPacket(parsed_packet);
}
// RTC_RUN_ON(worker_thread_)
void Call::NotifyBweOfReceivedPacket(const RtpPacketReceived& packet,
MediaType media_type) {
auto it = receive_rtp_config_.find(packet.Ssrc());
bool use_send_side_bwe = (it != receive_rtp_config_.end()) &&
UseSendSideBwe(it->second->rtp_config());
RTPHeader header;
packet.GetHeader(&header);
ReceivedPacket packet_msg;
packet_msg.size = DataSize::Bytes(packet.payload_size());
packet_msg.receive_time = packet.arrival_time();
if (header.extension.hasAbsoluteSendTime) {
packet_msg.send_time = header.extension.GetAbsoluteSendTimestamp();
}
transport_send_->OnReceivedPacket(packet_msg);
if (!use_send_side_bwe && header.extension.hasTransportSequenceNumber) {
// Inconsistent configuration of send side BWE. Do nothing.
// TODO(nisse): Without this check, we may produce RTCP feedback
// packets even when not negotiated. But it would be cleaner to
// move the check down to RTCPSender::SendFeedbackPacket, which
// would also help the PacketRouter to select an appropriate rtp
// module in the case that some, but not all, have RTCP feedback
// enabled.
return;
}
// For audio, we only support send side BWE.
if (media_type == MediaType::VIDEO ||
(use_send_side_bwe && header.extension.hasTransportSequenceNumber)) {
receive_side_cc_.OnReceivedPacket(
packet.arrival_time().ms(),
packet.payload_size() + packet.padding_size(), header);
}
}
} // namespace internal
} // namespace webrtc