/*
* 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 <map>
#include <memory>
#include <set>
#include <utility>
#include <vector>
#include "absl/types/optional.h"
#include "api/rtc_event_log/rtc_event_log.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 "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_utility.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/synchronization/sequence_checker.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;
}
// TODO(nisse): This really begs for a shared context struct.
bool UseSendSideBwe(const std::vector<RtpExtension>& extensions,
bool transport_cc) {
if (!transport_cc)
return false;
for (const auto& extension : extensions) {
if (extension.uri == RtpExtension::kTransportSequenceNumberUri ||
extension.uri == RtpExtension::kTransportSequenceNumberV2Uri)
return true;
}
return false;
}
bool UseSendSideBwe(const VideoReceiveStream::Config& config) {
return UseSendSideBwe(config.rtp.extensions, config.rtp.transport_cc);
}
bool UseSendSideBwe(const AudioReceiveStream::Config& config) {
return UseSendSideBwe(config.rtp.extensions, config.rtp.transport_cc);
}
bool UseSendSideBwe(const FlexfecReceiveStream::Config& config) {
return UseSendSideBwe(config.rtp_header_extensions, config.transport_cc);
}
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;
}
bool IsRtcp(const uint8_t* packet, size_t length) {
RtpUtility::RtpHeaderParser rtp_parser(packet, length);
return rtp_parser.RTCP();
}
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;
// 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 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:
DeliveryStatus DeliverRtcp(MediaType media_type,
const uint8_t* packet,
size_t length)
RTC_EXCLUSIVE_LOCKS_REQUIRED(worker_thread_);
DeliveryStatus DeliverRtp(MediaType media_type,
rtc::CopyOnWriteBuffer packet,
int64_t packet_time_us)
RTC_EXCLUSIVE_LOCKS_REQUIRED(worker_thread_);
void ConfigureSync(const std::string& sync_group)
RTC_EXCLUSIVE_LOCKS_REQUIRED(worker_thread_);
void NotifyBweOfReceivedPacket(const RtpPacketReceived& packet,
MediaType media_type)
RTC_SHARED_LOCKS_REQUIRED(worker_thread_);
void UpdateSendHistograms(Timestamp first_sent_packet)
RTC_EXCLUSIVE_LOCKS_REQUIRED(worker_thread_);
void UpdateReceiveHistograms();
void UpdateHistograms();
void UpdateAggregateNetworkState();
void RegisterRateObserver();
rtc::TaskQueue* send_transport_queue() const {
return transport_send_ptr_->GetWorkerQueue();
}
Clock* const clock_;
TaskQueueFactory* const task_queue_factory_;
TaskQueueBase* const worker_thread_;
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_;
Call::Config config_;
NetworkState audio_network_state_;
NetworkState video_network_state_;
bool aggregate_network_up_ RTC_GUARDED_BY(worker_thread_);
// Audio, Video, and FlexFEC receive streams are owned by the client that
// creates them.
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_;
RtpStreamReceiverController video_receiver_controller_;
// This extra map is used for receive processing which is
// independent of media type.
// TODO(nisse): In the RTP transport refactoring, we should have a
// single mapping from ssrc to a more abstract receive stream, with
// accessor methods for all configuration we need at this level.
struct ReceiveRtpConfig {
explicit ReceiveRtpConfig(const webrtc::AudioReceiveStream::Config& config)
: extensions(config.rtp.extensions),
use_send_side_bwe(UseSendSideBwe(config)) {}
explicit ReceiveRtpConfig(const webrtc::VideoReceiveStream::Config& config)
: extensions(config.rtp.extensions),
use_send_side_bwe(UseSendSideBwe(config)) {}
explicit ReceiveRtpConfig(const FlexfecReceiveStream::Config& config)
: extensions(config.rtp_header_extensions),
use_send_side_bwe(UseSendSideBwe(config)) {}
// Registered RTP header extensions for each stream. Note that RTP header
// extensions are negotiated per track ("m= line") in the SDP, but we have
// no notion of tracks at the Call level. We therefore store the RTP header
// extensions per SSRC instead, which leads to some storage overhead.
const RtpHeaderExtensionMap extensions;
// Set if both RTP extension the RTCP feedback message needed for
// send side BWE are negotiated.
const bool use_send_side_bwe;
};
std::map<uint32_t, ReceiveRtpConfig> 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_);
// 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* event_log_;
// The following members are only accessed (exclusively) from one thread and
// from the destructor, and therefore doesn't need any explicit
// synchronization.
RateCounter received_bytes_per_second_counter_;
RateCounter received_audio_bytes_per_second_counter_;
RateCounter received_video_bytes_per_second_counter_;
RateCounter received_rtcp_bytes_per_second_counter_;
absl::optional<int64_t> first_received_rtp_audio_ms_;
absl::optional<int64_t> last_received_rtp_audio_ms_;
absl::optional<int64_t> first_received_rtp_video_ms_;
absl::optional<int64_t> last_received_rtp_video_ms_;
uint32_t last_bandwidth_bps_ RTC_GUARDED_BY(worker_thread_);
// TODO(holmer): Remove this lock once BitrateController no longer calls
// OnNetworkChanged from multiple threads.
uint32_t min_allocated_send_bitrate_bps_ RTC_GUARDED_BY(worker_thread_);
uint32_t configured_max_padding_bitrate_bps_ RTC_GUARDED_BY(worker_thread_);
AvgCounter estimated_send_bitrate_kbps_counter_
RTC_GUARDED_BY(worker_thread_);
AvgCounter pacer_bitrate_kbps_counter_ RTC_GUARDED_BY(worker_thread_);
ReceiveSideCongestionController receive_side_cc_;
const std::unique_ptr<ReceiveTimeCalculator> receive_time_calculator_;
const std::unique_ptr<SendDelayStats> video_send_delay_stats_;
const int64_t start_ms_;
// 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.
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.
RtpTransportControllerSendInterface* const transport_send_ptr_;
// 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.
std::unique_ptr<RtpTransportControllerSendInterface> transport_send_;
bool is_target_rate_observer_registered_ 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, std::move(call_thread));
}
Call* Call::Create(const Call::Config& config,
rtc::scoped_refptr<SharedModuleThread> call_thread) {
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);
return new internal::Call(
clock, config,
std::make_unique<RtpTransportControllerSend>(
clock, config.event_log, config.network_state_predictor_factory,
config.network_controller_factory, config.bitrate_config,
std::move(pacer_thread), config.task_queue_factory, config.trials),
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:
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::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()),
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),
audio_network_state_(kNetworkDown),
video_network_state_(kNetworkDown),
aggregate_network_up_(false),
event_log_(config.event_log),
received_bytes_per_second_counter_(clock_, nullptr, true),
received_audio_bytes_per_second_counter_(clock_, nullptr, true),
received_video_bytes_per_second_counter_(clock_, nullptr, true),
received_rtcp_bytes_per_second_counter_(clock_, nullptr, true),
last_bandwidth_bps_(0),
min_allocated_send_bitrate_bps_(0),
configured_max_padding_bitrate_bps_(0),
estimated_send_bitrate_kbps_counter_(clock_, nullptr, true),
pacer_bitrate_kbps_counter_(clock_, nullptr, true),
receive_side_cc_(clock_, transport_send->packet_router()),
receive_time_calculator_(ReceiveTimeCalculator::CreateFromFieldTrial()),
video_send_delay_stats_(new SendDelayStats(clock_)),
start_ms_(clock_->TimeInMilliseconds()),
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(worker_thread_->IsCurrent());
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_);
absl::optional<Timestamp> first_sent_packet_ms =
transport_send_->GetFirstPacketTime();
// Only update histograms after process threads have been shut down, so that
// they won't try to concurrently update stats.
if (first_sent_packet_ms) {
UpdateSendHistograms(*first_sent_packet_ms);
}
UpdateReceiveHistograms();
UpdateHistograms();
}
void Call::RegisterRateObserver() {
RTC_DCHECK_RUN_ON(worker_thread_);
if (is_target_rate_observer_registered_)
return;
is_target_rate_observer_registered_ = true;
// 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_ptr_->RegisterTargetTransferRateObserver(this);
module_process_thread_->EnsureStarted();
}
void Call::SetClientBitratePreferences(const BitrateSettings& preferences) {
RTC_DCHECK_RUN_ON(worker_thread_);
GetTransportControllerSend()->SetClientBitratePreferences(preferences);
}
void Call::UpdateHistograms() {
RTC_HISTOGRAM_COUNTS_100000(
"WebRTC.Call.LifetimeInSeconds",
(clock_->TimeInMilliseconds() - start_ms_) / 1000);
}
// Called from the dtor.
void Call::UpdateSendHistograms(Timestamp first_sent_packet) {
int64_t elapsed_sec =
(clock_->TimeInMilliseconds() - first_sent_packet.ms()) / 1000;
if (elapsed_sec < 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::UpdateReceiveHistograms() {
if (first_received_rtp_audio_ms_) {
RTC_HISTOGRAM_COUNTS_100000(
"WebRTC.Call.TimeReceivingAudioRtpPacketsInSeconds",
(*last_received_rtp_audio_ms_ - *first_received_rtp_audio_ms_) / 1000);
}
if (first_received_rtp_video_ms_) {
RTC_HISTOGRAM_COUNTS_100000(
"WebRTC.Call.TimeReceivingVideoRtpPacketsInSeconds",
(*last_received_rtp_video_ms_ - *first_received_rtp_video_ms_) / 1000);
}
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);
}
}
PacketReceiver* Call::Receiver() {
RTC_DCHECK_RUN_ON(worker_thread_);
return this;
}
webrtc::AudioSendStream* Call::CreateAudioSendStream(
const webrtc::AudioSendStream::Config& config) {
TRACE_EVENT0("webrtc", "Call::CreateAudioSendStream");
RTC_DCHECK_RUN_ON(worker_thread_);
RegisterRateObserver();
// 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_,
module_process_thread_->process_thread(), transport_send_ptr_,
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;
for (AudioReceiveStream* stream : audio_receive_streams_) {
if (stream->config().rtp.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);
for (AudioReceiveStream* stream : audio_receive_streams_) {
if (stream->config().rtp.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_);
RegisterRateObserver();
event_log_->Log(std::make_unique<RtcEventAudioReceiveStreamConfig>(
CreateRtcLogStreamConfig(config)));
AudioReceiveStream* receive_stream = new AudioReceiveStream(
clock_, &audio_receiver_controller_, transport_send_ptr_->packet_router(),
module_process_thread_->process_thread(), config_.neteq_factory, config,
config_.audio_state, event_log_);
receive_rtp_config_.emplace(config.rtp.remote_ssrc, ReceiveRtpConfig(config));
audio_receive_streams_.insert(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);
const AudioReceiveStream::Config& config = audio_receive_stream->config();
uint32_t ssrc = config.rtp.remote_ssrc;
receive_side_cc_.GetRemoteBitrateEstimator(UseSendSideBwe(config))
->RemoveStream(ssrc);
audio_receive_streams_.erase(audio_receive_stream);
const std::string& sync_group = audio_receive_stream->config().sync_group;
const auto it = sync_stream_mapping_.find(sync_group);
if (it != sync_stream_mapping_.end() && it->second == audio_receive_stream) {
sync_stream_mapping_.erase(it);
ConfigureSync(sync_group);
}
receive_rtp_config_.erase(ssrc);
UpdateAggregateNetworkState();
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_);
RegisterRateObserver();
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_, module_process_thread_->process_thread(),
task_queue_factory_, call_stats_->AsRtcpRttStats(), transport_send_ptr_,
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);
// 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) {
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_);
send_stream->Stop();
VideoSendStream* send_stream_impl = nullptr;
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);
RTC_CHECK(send_stream_impl != nullptr);
VideoSendStream::RtpStateMap rtp_states;
VideoSendStream::RtpPayloadStateMap rtp_payload_states;
send_stream_impl->StopPermanentlyAndGetRtpStates(&rtp_states,
&rtp_payload_states);
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();
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));
RegisterRateObserver();
TaskQueueBase* current = GetCurrentTaskQueueOrThread();
RTC_CHECK(current);
VideoReceiveStream2* receive_stream = new VideoReceiveStream2(
task_queue_factory_, current, &video_receiver_controller_, num_cpu_cores_,
transport_send_ptr_->packet_router(), std::move(configuration),
module_process_thread_->process_thread(), call_stats_.get(), clock_,
new VCMTiming(clock_));
const webrtc::VideoReceiveStream::Config& config = receive_stream->config();
if (config.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(config.rtp.rtx_ssrc, ReceiveRtpConfig(config));
}
receive_rtp_config_.emplace(config.rtp.remote_ssrc, ReceiveRtpConfig(config));
video_receive_streams_.insert(receive_stream);
ConfigureSync(config.sync_group);
receive_stream->SignalNetworkState(video_network_state_);
UpdateAggregateNetworkState();
event_log_->Log(std::make_unique<RtcEventVideoReceiveStreamConfig>(
CreateRtcLogStreamConfig(config)));
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);
const VideoReceiveStream::Config& config = receive_stream_impl->config();
// 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(config.rtp.remote_ssrc);
if (config.rtp.rtx_ssrc) {
receive_rtp_config_.erase(config.rtp.rtx_ssrc);
}
video_receive_streams_.erase(receive_stream_impl);
ConfigureSync(config.sync_group);
receive_side_cc_.GetRemoteBitrateEstimator(UseSendSideBwe(config))
->RemoveStream(config.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_, &video_receiver_controller_, config, recovered_packet_receiver,
call_stats_->AsRtcpRttStats(), module_process_thread_->process_thread());
RTC_DCHECK(receive_rtp_config_.find(config.remote_ssrc) ==
receive_rtp_config_.end());
receive_rtp_config_.emplace(config.remote_ssrc, ReceiveRtpConfig(config));
// 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_);
RTC_DCHECK(receive_stream != nullptr);
const FlexfecReceiveStream::Config& config = receive_stream->GetConfig();
uint32_t ssrc = config.remote_ssrc;
receive_rtp_config_.erase(ssrc);
// Remove all SSRCs pointing to the FlexfecReceiveStreamImpl to be
// destroyed.
receive_side_cc_.GetRemoteBitrateEstimator(UseSendSideBwe(config))
->RemoveStream(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_ptr_;
}
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_ptr_->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_;
stats.max_padding_bitrate_bps = configured_max_padding_bitrate_bps_;
return stats;
}
void Call::SignalChannelNetworkState(MediaType media, NetworkState state) {
RTC_DCHECK_RUN_ON(worker_thread_);
switch (media) {
case MediaType::AUDIO:
audio_network_state_ = state;
break;
case MediaType::VIDEO:
video_network_state_ = state;
break;
case MediaType::ANY:
case MediaType::DATA:
RTC_NOTREACHED();
break;
}
UpdateAggregateNetworkState();
for (VideoReceiveStream2* video_receive_stream : video_receive_streams_) {
video_receive_stream->SignalNetworkState(video_network_state_);
}
}
void Call::OnAudioTransportOverheadChanged(int transport_overhead_per_packet) {
RTC_DCHECK_RUN_ON(worker_thread_);
for (auto& kv : audio_send_ssrcs_) {
kv.second->SetTransportOverhead(transport_overhead_per_packet);
}
}
void Call::UpdateAggregateNetworkState() {
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_ptr_->OnNetworkAvailability(aggregate_network_up);
}
void Call::OnSentPacket(const rtc::SentPacket& sent_packet) {
video_send_delay_stats_->OnSentPacket(sent_packet.packet_id,
clock_->TimeInMilliseconds());
transport_send_ptr_->OnSentPacket(sent_packet);
}
void Call::OnStartRateUpdate(DataRate start_rate) {
RTC_DCHECK_RUN_ON(send_transport_queue());
bitrate_allocator_->UpdateStartRate(start_rate.bps<uint32_t>());
}
void Call::OnTargetTransferRate(TargetTransferRate msg) {
RTC_DCHECK_RUN_ON(send_transport_queue());
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);
worker_thread_->PostTask(
ToQueuedTask(task_safety_, [this, target_bitrate_bps]() {
RTC_DCHECK_RUN_ON(worker_thread_);
last_bandwidth_bps_ = target_bitrate_bps;
// Ignore updates if bitrate is zero (the aggregate network state is
// down) or if we're not sending video.
if (target_bitrate_bps == 0 || video_send_streams_.empty()) {
estimated_send_bitrate_kbps_counter_.ProcessAndPause();
pacer_bitrate_kbps_counter_.ProcessAndPause();
return;
}
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::OnAllocationLimitsChanged(BitrateAllocationLimits limits) {
RTC_DCHECK_RUN_ON(send_transport_queue());
transport_send_ptr_->SetAllocatedSendBitrateLimits(limits);
worker_thread_->PostTask(ToQueuedTask(task_safety_, [this, limits]() {
RTC_DCHECK_RUN_ON(worker_thread_);
min_allocated_send_bitrate_bps_ = limits.min_allocatable_rate.bps();
configured_max_padding_bitrate_bps_ = limits.max_padding_rate.bps();
}));
}
void Call::ConfigureSync(const std::string& sync_group) {
// 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->config().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);
}
}
}
PacketReceiver::DeliveryStatus Call::DeliverRtcp(MediaType media_type,
const uint8_t* packet,
size_t length) {
TRACE_EVENT0("webrtc", "Call::DeliverRtcp");
// TODO(pbos): Make sure it's a valid packet.
// Return DELIVERY_UNKNOWN_SSRC if it can be determined that
// there's no receiver of the packet.
if (received_bytes_per_second_counter_.HasSample()) {
// First RTP packet has been received.
received_bytes_per_second_counter_.Add(static_cast<int>(length));
received_rtcp_bytes_per_second_counter_.Add(static_cast<int>(length));
}
bool rtcp_delivered = false;
if (media_type == MediaType::ANY || media_type == MediaType::VIDEO) {
for (VideoReceiveStream2* stream : video_receive_streams_) {
if (stream->DeliverRtcp(packet, length))
rtcp_delivered = true;
}
}
if (media_type == MediaType::ANY || media_type == MediaType::AUDIO) {
for (AudioReceiveStream* stream : audio_receive_streams_) {
stream->DeliverRtcp(packet, length);
rtcp_delivered = true;
}
}
if (media_type == MediaType::ANY || media_type == MediaType::VIDEO) {
for (VideoSendStream* stream : video_send_streams_) {
stream->DeliverRtcp(packet, length);
rtcp_delivered = true;
}
}
if (media_type == MediaType::ANY || media_type == MediaType::AUDIO) {
for (auto& kv : audio_send_ssrcs_) {
kv.second->DeliverRtcp(packet, length);
rtcp_delivered = true;
}
}
if (rtcp_delivered) {
event_log_->Log(std::make_unique<RtcEventRtcpPacketIncoming>(
rtc::MakeArrayView(packet, length)));
}
return rtcp_delivered ? DELIVERY_OK : DELIVERY_PACKET_ERROR;
}
PacketReceiver::DeliveryStatus Call::DeliverRtp(MediaType media_type,
rtc::CopyOnWriteBuffer packet,
int64_t packet_time_us) {
TRACE_EVENT0("webrtc", "Call::DeliverRtp");
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_ms((packet_time_us + 500) / 1000);
} else {
parsed_packet.set_arrival_time_ms(clock_->TimeInMilliseconds());
}
// 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(it->second.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)) {
received_bytes_per_second_counter_.Add(length);
received_audio_bytes_per_second_counter_.Add(length);
event_log_->Log(
std::make_unique<RtcEventRtpPacketIncoming>(parsed_packet));
const int64_t arrival_time_ms = parsed_packet.arrival_time_ms();
if (!first_received_rtp_audio_ms_) {
first_received_rtp_audio_ms_.emplace(arrival_time_ms);
}
last_received_rtp_audio_ms_.emplace(arrival_time_ms);
return DELIVERY_OK;
}
} else if (media_type == MediaType::VIDEO) {
parsed_packet.set_payload_type_frequency(kVideoPayloadTypeFrequency);
if (video_receiver_controller_.OnRtpPacket(parsed_packet)) {
received_bytes_per_second_counter_.Add(length);
received_video_bytes_per_second_counter_.Add(length);
event_log_->Log(
std::make_unique<RtcEventRtpPacketIncoming>(parsed_packet));
const int64_t arrival_time_ms = parsed_packet.arrival_time_ms();
if (!first_received_rtp_video_ms_) {
first_received_rtp_video_ms_.emplace(arrival_time_ms);
}
last_received_rtp_video_ms_.emplace(arrival_time_ms);
return DELIVERY_OK;
}
}
return DELIVERY_UNKNOWN_SSRC;
}
PacketReceiver::DeliveryStatus Call::DeliverPacket(
MediaType media_type,
rtc::CopyOnWriteBuffer packet,
int64_t packet_time_us) {
RTC_DCHECK_RUN_ON(worker_thread_);
if (IsRtcp(packet.cdata(), packet.size()))
return DeliverRtcp(media_type, packet.cdata(), packet.size());
return DeliverRtp(media_type, std::move(packet), packet_time_us);
}
void Call::OnRecoveredPacket(const uint8_t* packet, size_t length) {
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(it->second.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);
}
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()) && it->second.use_send_side_bwe;
RTPHeader header;
packet.GetHeader(&header);
ReceivedPacket packet_msg;
packet_msg.size = DataSize::Bytes(packet.payload_size());
packet_msg.receive_time = Timestamp::Millis(packet.arrival_time_ms());
if (header.extension.hasAbsoluteSendTime) {
packet_msg.send_time = header.extension.GetAbsoluteSendTimestamp();
}
transport_send_ptr_->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