| /* |
| * Copyright 2020 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 "video/adaptation/resource_adaptation_processor.h" |
| |
| #include <algorithm> |
| #include <limits> |
| #include <memory> |
| #include <string> |
| #include <utility> |
| |
| #include "absl/algorithm/container.h" |
| #include "absl/base/macros.h" |
| #include "api/task_queue/task_queue_base.h" |
| #include "api/video/video_source_interface.h" |
| #include "call/adaptation/resource.h" |
| #include "call/adaptation/video_source_restrictions.h" |
| #include "rtc_base/logging.h" |
| #include "rtc_base/numerics/safe_conversions.h" |
| #include "rtc_base/strings/string_builder.h" |
| #include "rtc_base/time_utils.h" |
| |
| namespace webrtc { |
| |
| const int kDefaultInputPixelsWidth = 176; |
| const int kDefaultInputPixelsHeight = 144; |
| |
| namespace { |
| |
| bool IsResolutionScalingEnabled(DegradationPreference degradation_preference) { |
| return degradation_preference == DegradationPreference::MAINTAIN_FRAMERATE || |
| degradation_preference == DegradationPreference::BALANCED; |
| } |
| |
| bool IsFramerateScalingEnabled(DegradationPreference degradation_preference) { |
| return degradation_preference == DegradationPreference::MAINTAIN_RESOLUTION || |
| degradation_preference == DegradationPreference::BALANCED; |
| } |
| |
| // Returns modified restrictions where any constraints that don't apply to the |
| // degradation preference are cleared. |
| VideoSourceRestrictions ApplyDegradationPreference( |
| VideoSourceRestrictions source_restrictions, |
| DegradationPreference degradation_preference) { |
| switch (degradation_preference) { |
| case DegradationPreference::BALANCED: |
| break; |
| case DegradationPreference::MAINTAIN_FRAMERATE: |
| source_restrictions.set_max_frame_rate(absl::nullopt); |
| break; |
| case DegradationPreference::MAINTAIN_RESOLUTION: |
| source_restrictions.set_max_pixels_per_frame(absl::nullopt); |
| source_restrictions.set_target_pixels_per_frame(absl::nullopt); |
| break; |
| case DegradationPreference::DISABLED: |
| source_restrictions.set_max_pixels_per_frame(absl::nullopt); |
| source_restrictions.set_target_pixels_per_frame(absl::nullopt); |
| source_restrictions.set_max_frame_rate(absl::nullopt); |
| } |
| return source_restrictions; |
| } |
| |
| // Returns AdaptationCounters where constraints that don't apply to the |
| // degredation preference are cleared. This behaviour must reflect that of |
| // ApplyDegredationPreference for SourceRestrictions. Any to that method must |
| // also change this one. |
| AdaptationCounters ApplyDegradationPreference( |
| AdaptationCounters counters, |
| DegradationPreference degradation_preference) { |
| switch (degradation_preference) { |
| case DegradationPreference::BALANCED: |
| break; |
| case DegradationPreference::MAINTAIN_FRAMERATE: |
| counters.fps_adaptations = 0; |
| break; |
| case DegradationPreference::MAINTAIN_RESOLUTION: |
| counters.resolution_adaptations = 0; |
| break; |
| case DegradationPreference::DISABLED: |
| counters.resolution_adaptations = 0; |
| counters.fps_adaptations = 0; |
| break; |
| default: |
| RTC_NOTREACHED(); |
| } |
| return counters; |
| } |
| |
| } // namespace |
| |
| class ResourceAdaptationProcessor::InitialFrameDropper { |
| public: |
| explicit InitialFrameDropper(QualityScalerResource* quality_scaler_resource) |
| : quality_scaler_resource_(quality_scaler_resource), |
| quality_scaler_settings_(QualityScalerSettings::ParseFromFieldTrials()), |
| has_seen_first_bwe_drop_(false), |
| set_start_bitrate_(DataRate::Zero()), |
| set_start_bitrate_time_ms_(0), |
| initial_framedrop_(0) { |
| RTC_DCHECK(quality_scaler_resource_); |
| } |
| |
| // Output signal. |
| bool DropInitialFrames() const { |
| return initial_framedrop_ < kMaxInitialFramedrop; |
| } |
| |
| // Input signals. |
| void SetStartBitrate(DataRate start_bitrate, int64_t now_ms) { |
| set_start_bitrate_ = start_bitrate; |
| set_start_bitrate_time_ms_ = now_ms; |
| } |
| |
| void SetTargetBitrate(DataRate target_bitrate, int64_t now_ms) { |
| if (set_start_bitrate_ > DataRate::Zero() && !has_seen_first_bwe_drop_ && |
| quality_scaler_resource_->is_started() && |
| quality_scaler_settings_.InitialBitrateIntervalMs() && |
| quality_scaler_settings_.InitialBitrateFactor()) { |
| int64_t diff_ms = now_ms - set_start_bitrate_time_ms_; |
| if (diff_ms < |
| quality_scaler_settings_.InitialBitrateIntervalMs().value() && |
| (target_bitrate < |
| (set_start_bitrate_ * |
| quality_scaler_settings_.InitialBitrateFactor().value()))) { |
| RTC_LOG(LS_INFO) << "Reset initial_framedrop_. Start bitrate: " |
| << set_start_bitrate_.bps() |
| << ", target bitrate: " << target_bitrate.bps(); |
| initial_framedrop_ = 0; |
| has_seen_first_bwe_drop_ = true; |
| } |
| } |
| } |
| |
| void OnFrameDroppedDueToSize() { ++initial_framedrop_; } |
| |
| void OnMaybeEncodeFrame() { initial_framedrop_ = kMaxInitialFramedrop; } |
| |
| void OnQualityScalerSettingsUpdated() { |
| if (quality_scaler_resource_->is_started()) { |
| // Restart frame drops due to size. |
| initial_framedrop_ = 0; |
| } else { |
| // Quality scaling disabled so we shouldn't drop initial frames. |
| initial_framedrop_ = kMaxInitialFramedrop; |
| } |
| } |
| |
| private: |
| // The maximum number of frames to drop at beginning of stream to try and |
| // achieve desired bitrate. |
| static const int kMaxInitialFramedrop = 4; |
| |
| const QualityScalerResource* quality_scaler_resource_; |
| const QualityScalerSettings quality_scaler_settings_; |
| bool has_seen_first_bwe_drop_; |
| DataRate set_start_bitrate_; |
| int64_t set_start_bitrate_time_ms_; |
| // Counts how many frames we've dropped in the initial framedrop phase. |
| int initial_framedrop_; |
| }; |
| |
| ResourceAdaptationProcessor::ResourceAdaptationProcessor( |
| Clock* clock, |
| bool experiment_cpu_load_estimator, |
| std::unique_ptr<OveruseFrameDetector> overuse_detector, |
| VideoStreamEncoderObserver* encoder_stats_observer, |
| ResourceAdaptationProcessorListener* adaptation_listener) |
| : adaptation_listener_(adaptation_listener), |
| clock_(clock), |
| state_(State::kStopped), |
| experiment_cpu_load_estimator_(experiment_cpu_load_estimator), |
| has_input_video_(false), |
| degradation_preference_(DegradationPreference::DISABLED), |
| stream_adapter_(std::make_unique<VideoStreamAdapter>()), |
| encode_usage_resource_( |
| std::make_unique<EncodeUsageResource>(std::move(overuse_detector))), |
| quality_scaler_resource_(std::make_unique<QualityScalerResource>()), |
| initial_frame_dropper_(std::make_unique<InitialFrameDropper>( |
| quality_scaler_resource_.get())), |
| quality_scaling_experiment_enabled_(QualityScalingExperiment::Enabled()), |
| last_input_frame_size_(absl::nullopt), |
| target_frame_rate_(absl::nullopt), |
| encoder_target_bitrate_bps_(absl::nullopt), |
| quality_rampup_done_(false), |
| quality_rampup_experiment_(QualityRampupExperiment::ParseSettings()), |
| encoder_settings_(absl::nullopt), |
| encoder_stats_observer_(encoder_stats_observer), |
| active_counts_() { |
| RTC_DCHECK(adaptation_listener_); |
| RTC_DCHECK(encoder_stats_observer_); |
| AddResource(encode_usage_resource_.get(), |
| AdaptationObserverInterface::AdaptReason::kCpu); |
| AddResource(quality_scaler_resource_.get(), |
| AdaptationObserverInterface::AdaptReason::kQuality); |
| } |
| |
| ResourceAdaptationProcessor::~ResourceAdaptationProcessor() { |
| RTC_DCHECK_EQ(state_, State::kStopped); |
| } |
| |
| void ResourceAdaptationProcessor::StartResourceAdaptation( |
| ResourceAdaptationProcessorListener* adaptation_listener) { |
| RTC_DCHECK_EQ(state_, State::kStopped); |
| RTC_DCHECK(encoder_settings_.has_value()); |
| // TODO(https://crbug.com/webrtc/11222): Rethink when the adaptation listener |
| // should be passed in and why. If resources are separated from modules then |
| // those resources may be started or stopped separately from the module. |
| RTC_DCHECK_EQ(adaptation_listener, adaptation_listener_); |
| encode_usage_resource_->StartCheckForOveruse(GetCpuOveruseOptions()); |
| for (auto& resource_and_reason : resources_) { |
| resource_and_reason.resource->RegisterListener(this); |
| } |
| state_ = State::kStarted; |
| } |
| |
| void ResourceAdaptationProcessor::StopResourceAdaptation() { |
| encode_usage_resource_->StopCheckForOveruse(); |
| quality_scaler_resource_->StopCheckForOveruse(); |
| for (auto& resource_and_reason : resources_) { |
| resource_and_reason.resource->UnregisterListener(this); |
| } |
| state_ = State::kStopped; |
| } |
| |
| void ResourceAdaptationProcessor::AddResource(Resource* resource) { |
| return AddResource(resource, AdaptationObserverInterface::AdaptReason::kCpu); |
| } |
| |
| void ResourceAdaptationProcessor::AddResource( |
| Resource* resource, |
| AdaptationObserverInterface::AdaptReason reason) { |
| RTC_DCHECK(resource); |
| RTC_DCHECK(absl::c_find_if(resources_, |
| [resource](const ResourceAndReason& r) { |
| return r.resource == resource; |
| }) == resources_.end()) |
| << "Resource " << resource->name() << " already was inserted"; |
| resources_.emplace_back(resource, reason); |
| } |
| |
| void ResourceAdaptationProcessor::SetHasInputVideo(bool has_input_video) { |
| // While false, OnResourceUnderuse() and OnResourceOveruse() are NO-OPS. |
| has_input_video_ = has_input_video; |
| } |
| |
| void ResourceAdaptationProcessor::SetDegradationPreference( |
| DegradationPreference degradation_preference) { |
| degradation_preference_ = degradation_preference; |
| if (stream_adapter_->SetDegradationPreference(degradation_preference) == |
| VideoStreamAdapter::SetDegradationPreferenceResult:: |
| kRestrictionsCleared) { |
| active_counts_.fill(AdaptationCounters()); |
| } |
| MaybeUpdateVideoSourceRestrictions(); |
| } |
| |
| void ResourceAdaptationProcessor::SetEncoderSettings( |
| EncoderSettings encoder_settings) { |
| encoder_settings_ = std::move(encoder_settings); |
| |
| quality_rampup_experiment_.SetMaxBitrate( |
| LastInputFrameSizeOrDefault(), |
| encoder_settings_->video_codec().maxBitrate); |
| MaybeUpdateTargetFrameRate(); |
| } |
| |
| void ResourceAdaptationProcessor::SetStartBitrate(DataRate start_bitrate) { |
| if (!start_bitrate.IsZero()) |
| encoder_target_bitrate_bps_ = start_bitrate.bps(); |
| initial_frame_dropper_->SetStartBitrate(start_bitrate, |
| clock_->TimeInMicroseconds()); |
| } |
| |
| void ResourceAdaptationProcessor::SetTargetBitrate(DataRate target_bitrate) { |
| if (!target_bitrate.IsZero()) |
| encoder_target_bitrate_bps_ = target_bitrate.bps(); |
| initial_frame_dropper_->SetTargetBitrate(target_bitrate, |
| clock_->TimeInMilliseconds()); |
| } |
| |
| void ResourceAdaptationProcessor::SetEncoderRates( |
| const VideoEncoder::RateControlParameters& encoder_rates) { |
| encoder_rates_ = encoder_rates; |
| } |
| |
| void ResourceAdaptationProcessor::ResetVideoSourceRestrictions() { |
| stream_adapter_->ClearRestrictions(); |
| active_counts_.fill(AdaptationCounters()); |
| MaybeUpdateVideoSourceRestrictions(); |
| } |
| |
| void ResourceAdaptationProcessor::OnFrame(const VideoFrame& frame) { |
| last_input_frame_size_ = frame.size(); |
| } |
| |
| void ResourceAdaptationProcessor::OnFrameDroppedDueToSize() { |
| AdaptationCounters counters_before = stream_adapter_->adaptation_counters(); |
| OnResourceOveruse(AdaptationObserverInterface::AdaptReason::kQuality); |
| if (degradation_preference() == DegradationPreference::BALANCED && |
| stream_adapter_->adaptation_counters().fps_adaptations > |
| counters_before.fps_adaptations) { |
| // Adapt framerate in same step as resolution. |
| OnResourceOveruse(AdaptationObserverInterface::AdaptReason::kQuality); |
| } |
| if (stream_adapter_->adaptation_counters().resolution_adaptations > |
| counters_before.resolution_adaptations) { |
| encoder_stats_observer_->OnInitialQualityResolutionAdaptDown(); |
| } |
| initial_frame_dropper_->OnFrameDroppedDueToSize(); |
| } |
| |
| void ResourceAdaptationProcessor::OnEncodeStarted( |
| const VideoFrame& cropped_frame, |
| int64_t time_when_first_seen_us) { |
| encode_usage_resource_->OnEncodeStarted(cropped_frame, |
| time_when_first_seen_us); |
| } |
| |
| void ResourceAdaptationProcessor::OnEncodeCompleted( |
| const EncodedImage& encoded_image, |
| int64_t time_sent_in_us, |
| absl::optional<int> encode_duration_us) { |
| // Inform |encode_usage_resource_| of the encode completed event. |
| uint32_t timestamp = encoded_image.Timestamp(); |
| int64_t capture_time_us = |
| encoded_image.capture_time_ms_ * rtc::kNumMicrosecsPerMillisec; |
| encode_usage_resource_->OnEncodeCompleted( |
| timestamp, time_sent_in_us, capture_time_us, encode_duration_us); |
| // Inform |quality_scaler_resource_| of the encode completed event. |
| quality_scaler_resource_->OnEncodeCompleted(encoded_image, time_sent_in_us); |
| } |
| |
| void ResourceAdaptationProcessor::OnFrameDropped( |
| EncodedImageCallback::DropReason reason) { |
| quality_scaler_resource_->OnFrameDropped(reason); |
| } |
| |
| bool ResourceAdaptationProcessor::DropInitialFrames() const { |
| return initial_frame_dropper_->DropInitialFrames(); |
| } |
| |
| void ResourceAdaptationProcessor::OnMaybeEncodeFrame() { |
| initial_frame_dropper_->OnMaybeEncodeFrame(); |
| MaybePerformQualityRampupExperiment(); |
| } |
| |
| void ResourceAdaptationProcessor::UpdateQualityScalerSettings( |
| absl::optional<VideoEncoder::QpThresholds> qp_thresholds) { |
| if (qp_thresholds.has_value()) { |
| quality_scaler_resource_->StopCheckForOveruse(); |
| quality_scaler_resource_->StartCheckForOveruse(qp_thresholds.value()); |
| } else { |
| quality_scaler_resource_->StopCheckForOveruse(); |
| } |
| initial_frame_dropper_->OnQualityScalerSettingsUpdated(); |
| } |
| |
| void ResourceAdaptationProcessor::ConfigureQualityScaler( |
| const VideoEncoder::EncoderInfo& encoder_info) { |
| const auto scaling_settings = encoder_info.scaling_settings; |
| const bool quality_scaling_allowed = |
| IsResolutionScalingEnabled(degradation_preference_) && |
| scaling_settings.thresholds; |
| |
| // TODO(https://crbug.com/webrtc/11222): Should this move to |
| // QualityScalerResource? |
| if (quality_scaling_allowed) { |
| if (!quality_scaler_resource_->is_started()) { |
| // Quality scaler has not already been configured. |
| |
| // Use experimental thresholds if available. |
| absl::optional<VideoEncoder::QpThresholds> experimental_thresholds; |
| if (quality_scaling_experiment_enabled_) { |
| experimental_thresholds = QualityScalingExperiment::GetQpThresholds( |
| GetVideoCodecTypeOrGeneric(encoder_settings_)); |
| } |
| UpdateQualityScalerSettings(experimental_thresholds |
| ? *experimental_thresholds |
| : *(scaling_settings.thresholds)); |
| } |
| } else { |
| UpdateQualityScalerSettings(absl::nullopt); |
| } |
| |
| // Set the qp-thresholds to the balanced settings if balanced mode. |
| if (degradation_preference_ == DegradationPreference::BALANCED && |
| quality_scaler_resource_->is_started()) { |
| absl::optional<VideoEncoder::QpThresholds> thresholds = |
| stream_adapter_->balanced_settings().GetQpThresholds( |
| GetVideoCodecTypeOrGeneric(encoder_settings_), |
| LastInputFrameSizeOrDefault()); |
| if (thresholds) { |
| quality_scaler_resource_->SetQpThresholds(*thresholds); |
| } |
| } |
| |
| encoder_stats_observer_->OnAdaptationChanged( |
| VideoStreamEncoderObserver::AdaptationReason::kNone, |
| GetActiveCounts(AdaptationObserverInterface::AdaptReason::kCpu), |
| GetActiveCounts(AdaptationObserverInterface::AdaptReason::kQuality)); |
| } |
| |
| ResourceListenerResponse |
| ResourceAdaptationProcessor::OnResourceUsageStateMeasured( |
| const Resource& resource) { |
| const auto& registered_resource = |
| absl::c_find_if(resources_, [&resource](const ResourceAndReason& r) { |
| return r.resource == &resource; |
| }); |
| RTC_DCHECK(registered_resource != resources_.end()) |
| << resource.name() << " not found."; |
| |
| const AdaptationObserverInterface::AdaptReason reason = |
| registered_resource->reason; |
| switch (resource.usage_state()) { |
| case ResourceUsageState::kOveruse: |
| return OnResourceOveruse(reason); |
| case ResourceUsageState::kStable: |
| // Do nothing. |
| // |
| // This module has two resources: |encoude_usage_resource_| and |
| // |quality_scaler_resource_|. A smarter adaptation module might not |
| // attempt to adapt up unless ALL resources were underused, but this |
| // module acts on each resource's measurement in isolation - without |
| // taking the current usage of any other resource into account. |
| return ResourceListenerResponse::kNothing; |
| case ResourceUsageState::kUnderuse: |
| OnResourceUnderuse(reason); |
| return ResourceListenerResponse::kNothing; |
| } |
| } |
| |
| void ResourceAdaptationProcessor::OnResourceUnderuse( |
| AdaptationObserverInterface::AdaptReason reason) { |
| // We can't adapt up if we're already at the highest setting. |
| // Note that this only includes counts relevant to the current degradation |
| // preference. e.g. we previously adapted resolution, now prefer adpating fps, |
| // only count the fps adaptations and not the previous resolution adaptations. |
| // |
| // TODO(https://crbug.com/webrtc/11394): Checking the counts for reason should |
| // be replaced with checking the overuse state of all resources. This is |
| // effectively trying to infer if the the Resource specified by |reason| is OK |
| // with adapting up by looking at active counters. If the relevant Resources |
| // simply told us this directly we wouldn't have to depend on stats counters |
| // to abort GetAdaptUpTarget(). |
| int num_downgrades = ApplyDegradationPreference(active_counts_[reason], |
| degradation_preference_) |
| .Total(); |
| RTC_DCHECK_GE(num_downgrades, 0); |
| if (num_downgrades == 0) |
| return; |
| // Current video input states used by VideoStreamAdapter. |
| const VideoStreamAdapter::VideoInputMode input_mode = GetVideoInputMode(); |
| const int input_pixels = LastInputFrameSizeOrDefault(); |
| const int input_fps = encoder_stats_observer_->GetInputFrameRate(); |
| // Should we adapt, if so to what target? |
| absl::optional<VideoStreamAdapter::AdaptationTarget> target = |
| stream_adapter_->GetAdaptUpTarget(encoder_settings_, |
| encoder_target_bitrate_bps_, input_mode, |
| input_pixels, input_fps, reason); |
| if (!target.has_value()) |
| return; |
| // Apply target. |
| stream_adapter_->ApplyAdaptationTarget(target.value(), encoder_settings_, |
| input_mode, input_pixels, input_fps); |
| // Update VideoSourceRestrictions based on adaptation. This also informs the |
| // |adaptation_listener_|. |
| MaybeUpdateVideoSourceRestrictions(); |
| // Stats and logging. |
| UpdateAdaptationStats(reason); |
| RTC_LOG(LS_INFO) << ActiveCountsToString(); |
| } |
| |
| ResourceListenerResponse ResourceAdaptationProcessor::OnResourceOveruse( |
| AdaptationObserverInterface::AdaptReason reason) { |
| if (!has_input_video_) |
| return ResourceListenerResponse::kQualityScalerShouldIncreaseFrequency; |
| // Current video input states used by VideoStreamAdapter. |
| const VideoStreamAdapter::VideoInputMode input_mode = GetVideoInputMode(); |
| const int input_pixels = LastInputFrameSizeOrDefault(); |
| const int input_fps = encoder_stats_observer_->GetInputFrameRate(); |
| // Should we adapt, if so to what target? |
| absl::optional<VideoStreamAdapter::AdaptationTarget> target = |
| stream_adapter_->GetAdaptDownTarget(encoder_settings_, input_mode, |
| input_pixels, input_fps, |
| encoder_stats_observer_); |
| if (!target.has_value()) |
| return ResourceListenerResponse::kNothing; |
| // Apply target. |
| ResourceListenerResponse response = stream_adapter_->ApplyAdaptationTarget( |
| target.value(), encoder_settings_, input_mode, input_pixels, input_fps); |
| // Update VideoSourceRestrictions based on adaptation. This also informs the |
| // |adaptation_listener_|. |
| MaybeUpdateVideoSourceRestrictions(); |
| // Stats and logging. |
| UpdateAdaptationStats(reason); |
| RTC_LOG(INFO) << ActiveCountsToString(); |
| return response; |
| } |
| |
| // TODO(pbos): Lower these thresholds (to closer to 100%) when we handle |
| // pipelining encoders better (multiple input frames before something comes |
| // out). This should effectively turn off CPU adaptations for systems that |
| // remotely cope with the load right now. |
| CpuOveruseOptions ResourceAdaptationProcessor::GetCpuOveruseOptions() const { |
| // This is already ensured by the only caller of this method: |
| // StartResourceAdaptation(). |
| RTC_DCHECK(encoder_settings_.has_value()); |
| CpuOveruseOptions options; |
| // Hardware accelerated encoders are assumed to be pipelined; give them |
| // additional overuse time. |
| if (encoder_settings_->encoder_info().is_hardware_accelerated) { |
| options.low_encode_usage_threshold_percent = 150; |
| options.high_encode_usage_threshold_percent = 200; |
| } |
| if (experiment_cpu_load_estimator_) { |
| options.filter_time_ms = 5 * rtc::kNumMillisecsPerSec; |
| } |
| return options; |
| } |
| |
| int ResourceAdaptationProcessor::LastInputFrameSizeOrDefault() const { |
| // The dependency on this hardcoded resolution is inherited from old code, |
| // which used this resolution as a stand-in for not knowing the resolution |
| // yet. |
| // TODO(hbos): Can we simply DCHECK has_value() before usage instead? Having a |
| // DCHECK passed all the tests but adding it does change the requirements of |
| // this class (= not being allowed to call OnResourceUnderuse() or |
| // OnResourceOveruse() before OnFrame()) and deserves a standalone CL. |
| return last_input_frame_size_.value_or(kDefaultInputPixelsWidth * |
| kDefaultInputPixelsHeight); |
| } |
| |
| void ResourceAdaptationProcessor::MaybeUpdateVideoSourceRestrictions() { |
| VideoSourceRestrictions new_restrictions = ApplyDegradationPreference( |
| stream_adapter_->source_restrictions(), degradation_preference_); |
| if (video_source_restrictions_ != new_restrictions) { |
| video_source_restrictions_ = std::move(new_restrictions); |
| adaptation_listener_->OnVideoSourceRestrictionsUpdated( |
| video_source_restrictions_); |
| MaybeUpdateTargetFrameRate(); |
| } |
| } |
| |
| void ResourceAdaptationProcessor::MaybeUpdateTargetFrameRate() { |
| absl::optional<double> codec_max_frame_rate = |
| encoder_settings_.has_value() |
| ? absl::optional<double>( |
| encoder_settings_->video_codec().maxFramerate) |
| : absl::nullopt; |
| // The current target framerate is the maximum frame rate as specified by |
| // the current codec configuration or any limit imposed by the adaptation |
| // module. This is used to make sure overuse detection doesn't needlessly |
| // trigger in low and/or variable framerate scenarios. |
| absl::optional<double> target_frame_rate = |
| ApplyDegradationPreference(stream_adapter_->source_restrictions(), |
| degradation_preference_) |
| .max_frame_rate(); |
| if (!target_frame_rate.has_value() || |
| (codec_max_frame_rate.has_value() && |
| codec_max_frame_rate.value() < target_frame_rate.value())) { |
| target_frame_rate = codec_max_frame_rate; |
| } |
| encode_usage_resource_->SetTargetFrameRate(target_frame_rate); |
| } |
| |
| void ResourceAdaptationProcessor::OnAdaptationCountChanged( |
| const AdaptationCounters& adaptation_count, |
| AdaptationCounters* active_count, |
| AdaptationCounters* other_active) { |
| RTC_DCHECK(active_count); |
| RTC_DCHECK(other_active); |
| const int active_total = active_count->Total(); |
| const int other_total = other_active->Total(); |
| const AdaptationCounters prev_total = *active_count + *other_active; |
| const AdaptationCounters delta = adaptation_count - prev_total; |
| |
| RTC_DCHECK_EQ( |
| std::abs(delta.resolution_adaptations) + std::abs(delta.fps_adaptations), |
| 1) |
| << "Adaptation took more than one step!"; |
| |
| if (delta.resolution_adaptations > 0) { |
| ++active_count->resolution_adaptations; |
| } else if (delta.resolution_adaptations < 0) { |
| if (active_count->resolution_adaptations == 0) { |
| RTC_DCHECK_GT(active_count->fps_adaptations, 0) << "No downgrades left"; |
| RTC_DCHECK_GT(other_active->resolution_adaptations, 0) |
| << "No resolution adaptation to borrow from"; |
| // Lend an fps adaptation to other and take one resolution adaptation. |
| --active_count->fps_adaptations; |
| ++other_active->fps_adaptations; |
| --other_active->resolution_adaptations; |
| } else { |
| --active_count->resolution_adaptations; |
| } |
| } |
| if (delta.fps_adaptations > 0) { |
| ++active_count->fps_adaptations; |
| } else if (delta.fps_adaptations < 0) { |
| if (active_count->fps_adaptations == 0) { |
| RTC_DCHECK_GT(active_count->resolution_adaptations, 0) |
| << "No downgrades left"; |
| RTC_DCHECK_GT(other_active->fps_adaptations, 0) |
| << "No fps adaptation to borrow from"; |
| // Lend a resolution adaptation to other and take one fps adaptation. |
| --active_count->resolution_adaptations; |
| ++other_active->resolution_adaptations; |
| --other_active->fps_adaptations; |
| } else { |
| --active_count->fps_adaptations; |
| } |
| } |
| |
| RTC_DCHECK(*active_count + *other_active == adaptation_count); |
| RTC_DCHECK_EQ(other_active->Total(), other_total); |
| RTC_DCHECK_EQ(active_count->Total(), active_total + delta.Total()); |
| RTC_DCHECK_GE(active_count->resolution_adaptations, 0); |
| RTC_DCHECK_GE(active_count->fps_adaptations, 0); |
| RTC_DCHECK_GE(other_active->resolution_adaptations, 0); |
| RTC_DCHECK_GE(other_active->fps_adaptations, 0); |
| } |
| |
| // TODO(nisse): Delete, once AdaptReason and AdaptationReason are merged. |
| void ResourceAdaptationProcessor::UpdateAdaptationStats( |
| AdaptationObserverInterface::AdaptReason reason) { |
| // Update active counts |
| AdaptationCounters& active_count = active_counts_[reason]; |
| AdaptationCounters& other_active = active_counts_[(reason + 1) % 2]; |
| const AdaptationCounters total_counts = |
| stream_adapter_->adaptation_counters(); |
| |
| OnAdaptationCountChanged(total_counts, &active_count, &other_active); |
| |
| switch (reason) { |
| case AdaptationObserverInterface::AdaptReason::kCpu: |
| encoder_stats_observer_->OnAdaptationChanged( |
| VideoStreamEncoderObserver::AdaptationReason::kCpu, |
| GetActiveCounts(AdaptationObserverInterface::AdaptReason::kCpu), |
| GetActiveCounts(AdaptationObserverInterface::AdaptReason::kQuality)); |
| break; |
| case AdaptationObserverInterface::AdaptReason::kQuality: |
| encoder_stats_observer_->OnAdaptationChanged( |
| VideoStreamEncoderObserver::AdaptationReason::kQuality, |
| GetActiveCounts(AdaptationObserverInterface::AdaptReason::kCpu), |
| GetActiveCounts(AdaptationObserverInterface::AdaptReason::kQuality)); |
| break; |
| } |
| } |
| |
| VideoStreamEncoderObserver::AdaptationSteps |
| ResourceAdaptationProcessor::GetActiveCounts( |
| AdaptationObserverInterface::AdaptReason reason) { |
| // TODO(https://crbug.com/webrtc/11392) Ideally this shuold be moved out of |
| // this class and into the encoder_stats_observer_. |
| const AdaptationCounters counters = active_counts_[reason]; |
| |
| VideoStreamEncoderObserver::AdaptationSteps counts = |
| VideoStreamEncoderObserver::AdaptationSteps(); |
| counts.num_resolution_reductions = counters.resolution_adaptations; |
| counts.num_framerate_reductions = counters.fps_adaptations; |
| switch (reason) { |
| case AdaptationObserverInterface::AdaptReason::kCpu: |
| if (!IsFramerateScalingEnabled(degradation_preference_)) |
| counts.num_framerate_reductions = absl::nullopt; |
| if (!IsResolutionScalingEnabled(degradation_preference_)) |
| counts.num_resolution_reductions = absl::nullopt; |
| break; |
| case AdaptationObserverInterface::AdaptReason::kQuality: |
| if (!IsFramerateScalingEnabled(degradation_preference_) || |
| !quality_scaler_resource_->is_started()) { |
| counts.num_framerate_reductions = absl::nullopt; |
| } |
| if (!IsResolutionScalingEnabled(degradation_preference_) || |
| !quality_scaler_resource_->is_started()) { |
| counts.num_resolution_reductions = absl::nullopt; |
| } |
| break; |
| } |
| return counts; |
| } |
| |
| VideoStreamAdapter::VideoInputMode |
| ResourceAdaptationProcessor::GetVideoInputMode() const { |
| if (!has_input_video_) |
| return VideoStreamAdapter::VideoInputMode::kNoVideo; |
| return (encoder_settings_.has_value() && |
| encoder_settings_->encoder_config().content_type == |
| VideoEncoderConfig::ContentType::kScreen) |
| ? VideoStreamAdapter::VideoInputMode::kScreenshareVideo |
| : VideoStreamAdapter::VideoInputMode::kNormalVideo; |
| } |
| |
| void ResourceAdaptationProcessor::MaybePerformQualityRampupExperiment() { |
| if (!quality_scaler_resource_->is_started()) |
| return; |
| |
| if (quality_rampup_done_) |
| return; |
| |
| int64_t now_ms = clock_->TimeInMilliseconds(); |
| uint32_t bw_kbps = encoder_rates_.has_value() |
| ? encoder_rates_.value().bandwidth_allocation.kbps() |
| : 0; |
| |
| bool try_quality_rampup = false; |
| if (quality_rampup_experiment_.BwHigh(now_ms, bw_kbps)) { |
| // Verify that encoder is at max bitrate and the QP is low. |
| if (encoder_settings_ && |
| encoder_target_bitrate_bps_.value_or(0) == |
| encoder_settings_->video_codec().maxBitrate * 1000 && |
| quality_scaler_resource_->QpFastFilterLow()) { |
| try_quality_rampup = true; |
| } |
| } |
| // TODO(https://crbug.com/webrtc/11392): See if we can rely on the total |
| // counts or the stats, and not the active counts. |
| const AdaptationCounters& qp_counts = |
| std::get<AdaptationObserverInterface::kQuality>(active_counts_); |
| const AdaptationCounters& cpu_counts = |
| std::get<AdaptationObserverInterface::kCpu>(active_counts_); |
| if (try_quality_rampup && qp_counts.resolution_adaptations > 0 && |
| cpu_counts.Total() == 0) { |
| RTC_LOG(LS_INFO) << "Reset quality limitations."; |
| ResetVideoSourceRestrictions(); |
| quality_rampup_done_ = true; |
| } |
| } |
| |
| std::string ResourceAdaptationProcessor::ActiveCountsToString() const { |
| rtc::StringBuilder ss; |
| |
| ss << "Downgrade counts: fps: {"; |
| for (size_t reason = 0; reason < active_counts_.size(); ++reason) { |
| ss << (reason ? " cpu" : "quality") << ":"; |
| ss << active_counts_[reason].fps_adaptations; |
| } |
| ss << "}, resolution {"; |
| for (size_t reason = 0; reason < active_counts_.size(); ++reason) { |
| ss << (reason ? " cpu" : "quality") << ":"; |
| ss << active_counts_[reason].resolution_adaptations; |
| } |
| ss << "}"; |
| |
| return ss.Release(); |
| } |
| } // namespace webrtc |
