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/*
* 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.
*/
#ifndef CALL_ADAPTATION_RESOURCE_ADAPTATION_PROCESSOR_H_
#define CALL_ADAPTATION_RESOURCE_ADAPTATION_PROCESSOR_H_
#include <map>
#include <memory>
#include <vector>
#include "absl/types/optional.h"
#include "api/rtp_parameters.h"
#include "api/scoped_refptr.h"
#include "api/video/video_frame.h"
#include "api/video/video_stream_encoder_observer.h"
#include "call/adaptation/resource.h"
#include "call/adaptation/resource_adaptation_processor_interface.h"
#include "call/adaptation/video_source_restrictions.h"
#include "call/adaptation/video_stream_adapter.h"
#include "call/adaptation/video_stream_input_state.h"
#include "call/adaptation/video_stream_input_state_provider.h"
#include "rtc_base/synchronization/sequence_checker.h"
namespace webrtc {
// The Resource Adaptation Processor is responsible for reacting to resource
// usage measurements (e.g. overusing or underusing CPU). When a resource is
// overused the Processor is responsible for performing mitigations in order to
// consume less resources.
//
// Today we have one Processor per VideoStreamEncoder and the Processor is only
// capable of restricting resolution or frame rate of the encoded stream. In the
// future we should have a single Processor responsible for all encoded streams,
// and it should be capable of reconfiguring other things than just
// VideoSourceRestrictions (e.g. reduce render frame rate).
// See Resource-Adaptation hotlist:
// https://bugs.chromium.org/u/590058293/hotlists/Resource-Adaptation
//
// The ResourceAdaptationProcessor is single-threaded. It may be constructed on
// any thread but MUST subsequently be used and destroyed on a single sequence,
// i.e. the "resource adaptation task queue".
class ResourceAdaptationProcessor : public ResourceAdaptationProcessorInterface,
public ResourceListener {
public:
ResourceAdaptationProcessor(
VideoStreamInputStateProvider* input_state_provider,
VideoStreamEncoderObserver* encoder_stats_observer);
~ResourceAdaptationProcessor() override;
void InitializeOnResourceAdaptationQueue() override;
// ResourceAdaptationProcessorInterface implementation.
DegradationPreference degradation_preference() const override;
DegradationPreference effective_degradation_preference() const override;
void StartResourceAdaptation() override;
void StopResourceAdaptation() override;
void AddAdaptationListener(
ResourceAdaptationProcessorListener* adaptation_listener) override;
void RemoveAdaptationListener(
ResourceAdaptationProcessorListener* adaptation_listener) override;
void AddResource(rtc::scoped_refptr<Resource> resource) override;
void RemoveResource(rtc::scoped_refptr<Resource> resource) override;
void SetDegradationPreference(
DegradationPreference degradation_preference) override;
void SetIsScreenshare(bool is_screenshare) override;
void ResetVideoSourceRestrictions() override;
// ResourceListener implementation.
// Triggers OnResourceUnderuse() or OnResourceOveruse().
void OnResourceUsageStateMeasured(
rtc::scoped_refptr<Resource> resource) override;
// May trigger 1-2 adaptations. It is meant to reduce resolution but this is
// not guaranteed. It may adapt frame rate, which does not address the issue.
// TODO(hbos): Can we get rid of this?
void TriggerAdaptationDueToFrameDroppedDueToSize(
rtc::scoped_refptr<Resource> reason_resource) override;
private:
bool HasSufficientInputForAdaptation(
const VideoStreamInputState& input_state) const;
// Performs the adaptation by getting the next target, applying it and
// informing listeners of the new VideoSourceRestriction and adaptation
// counters.
void OnResourceUnderuse(rtc::scoped_refptr<Resource> reason_resource);
void OnResourceOveruse(rtc::scoped_refptr<Resource> reason_resource);
// Needs to be invoked any time |degradation_preference_| or |is_screenshare_|
// changes to ensure |effective_degradation_preference_| is up-to-date.
void MaybeUpdateEffectiveDegradationPreference();
// If the filtered source restrictions are different than
// |last_reported_source_restrictions_|, inform the listeners.
void MaybeUpdateVideoSourceRestrictions(rtc::scoped_refptr<Resource> reason);
// Updates the number of times the resource has degraded based on the latest
// degradation applied.
void UpdateResourceDegradationCounts(rtc::scoped_refptr<Resource> resource);
// Returns true if a Resource has been overused in the pass and is responsible
// for creating a VideoSourceRestriction. The current algorithm counts the
// number of times the resource caused an adaptation and allows adapting up
// if that number is non-zero. This is consistent with how adaptation has
// traditionally been handled.
// TODO(crbug.com/webrtc/11553) Change this algorithm to look at the resources
// restrictions rather than just the counters.
bool IsResourceAllowedToAdaptUp(rtc::scoped_refptr<Resource> resource) const;
webrtc::SequenceChecker sequence_checker_;
bool is_resource_adaptation_enabled_ RTC_GUARDED_BY(sequence_checker_);
// Input and output.
VideoStreamInputStateProvider* const input_state_provider_
RTC_GUARDED_BY(sequence_checker_);
VideoStreamEncoderObserver* const encoder_stats_observer_
RTC_GUARDED_BY(sequence_checker_);
std::vector<ResourceAdaptationProcessorListener*> adaptation_listeners_
RTC_GUARDED_BY(sequence_checker_);
std::vector<rtc::scoped_refptr<Resource>> resources_
RTC_GUARDED_BY(sequence_checker_);
// Purely used for statistics, does not ensure mapped resources stay alive.
std::map<const Resource*, int> adaptations_counts_by_resource_
RTC_GUARDED_BY(sequence_checker_);
// Adaptation strategy settings.
DegradationPreference degradation_preference_
RTC_GUARDED_BY(sequence_checker_);
DegradationPreference effective_degradation_preference_
RTC_GUARDED_BY(sequence_checker_);
bool is_screenshare_ RTC_GUARDED_BY(sequence_checker_);
// Responsible for generating and applying possible adaptations.
const std::unique_ptr<VideoStreamAdapter> stream_adapter_
RTC_GUARDED_BY(sequence_checker_);
VideoSourceRestrictions last_reported_source_restrictions_
RTC_GUARDED_BY(sequence_checker_);
// Prevents recursion.
//
// This is used to prevent triggering resource adaptation in the process of
// already handling resouce adaptation, since that could cause the same states
// to be modified in unexpected ways. Example:
//
// Resource::OnResourceUsageStateMeasured() ->
// ResourceAdaptationProcessor::OnResourceOveruse() ->
// Resource::OnAdaptationApplied() ->
// Resource::OnResourceUsageStateMeasured() ->
// ResourceAdaptationProcessor::OnResourceOveruse() // Boom, not allowed.
bool processing_in_progress_ RTC_GUARDED_BY(sequence_checker_);
};
} // namespace webrtc
#endif // CALL_ADAPTATION_RESOURCE_ADAPTATION_PROCESSOR_H_
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