blob: 81ba5465d30f1afb73f3c8d38074d09907b7cd8f [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 <list>
#include <memory>
#include "api/optional.h"
#include "modules/video_coding/utility/quality_scaler.h"
#include "rtc_base/constructormagic.h"
#include "rtc_base/numerics/exp_filter.h"
#include "rtc_base/sequenced_task_checker.h"
#include "rtc_base/task_queue.h"
#include "rtc_base/thread_annotations.h"
namespace webrtc {
class VideoFrame;
struct CpuOveruseOptions {
int low_encode_usage_threshold_percent; // Threshold for triggering underuse.
int high_encode_usage_threshold_percent; // Threshold for triggering overuse.
// General settings.
int frame_timeout_interval_ms; // The maximum allowed interval between two
// frames before resetting estimations.
int min_frame_samples; // The minimum number of frames required.
int min_process_count; // The number of initial process times required before
// triggering an overuse/underuse.
int high_threshold_consecutive_count; // The number of consecutive checks
// above the high threshold before
// triggering an overuse.
// New estimator enabled if this is set non-zero.
int filter_time_ms; // Time constant for averaging
struct CpuOveruseMetrics {
CpuOveruseMetrics() : encode_usage_percent(-1) {}
int encode_usage_percent; // Average encode time divided by the average time
// difference between incoming captured frames.
class CpuOveruseMetricsObserver {
virtual ~CpuOveruseMetricsObserver() {}
virtual void OnEncodedFrameTimeMeasured(int encode_duration_ms,
const CpuOveruseMetrics& metrics) = 0;
// Use to detect system overuse based on the send-side processing time of
// incoming frames. All methods must be called on a single task queue but it can
// be created and destroyed on an arbitrary thread.
// OveruseFrameDetector::StartCheckForOveruse must be called to periodically
// check for overuse.
class OveruseFrameDetector {
OveruseFrameDetector(const CpuOveruseOptions& options,
CpuOveruseMetricsObserver* metrics_observer);
virtual ~OveruseFrameDetector();
// Start to periodically check for overuse.
void StartCheckForOveruse(AdaptationObserverInterface* overuse_observer);
// StopCheckForOveruse must be called before destruction if
// StartCheckForOveruse has been called.
void StopCheckForOveruse();
// Defines the current maximum framerate targeted by the capturer. This is
// used to make sure the encode usage percent doesn't drop unduly if the
// capturer has quiet periods (for instance caused by screen capturers with
// variable capture rate depending on content updates), otherwise we might
// experience adaptation toggling.
virtual void OnTargetFramerateUpdated(int framerate_fps);
// Called for each captured frame.
void FrameCaptured(const VideoFrame& frame, int64_t time_when_first_seen_us);
// Called for each sent frame.
void FrameSent(uint32_t timestamp,
int64_t time_sent_in_us,
int64_t capture_time_us,
rtc::Optional<int> encode_duration_us);
// Interface for cpu load estimation. Intended for internal use only.
class ProcessingUsage {
virtual void Reset() = 0;
virtual void SetMaxSampleDiffMs(float diff_ms) = 0;
virtual void FrameCaptured(const VideoFrame& frame,
int64_t time_when_first_seen_us,
int64_t last_capture_time_us) = 0;
// Returns encode_time in us, if there's a new measurement.
virtual rtc::Optional<int> FrameSent(
// These two argument used by old estimator.
uint32_t timestamp,
int64_t time_sent_in_us,
// And these two by the new estimator.
int64_t capture_time_us,
rtc::Optional<int> encode_duration_us) = 0;
virtual int Value() = 0;
virtual ~ProcessingUsage() = default;
// Protected for test purposes.
void CheckForOveruse(AdaptationObserverInterface* overuse_observer);
class CheckOveruseTask;
void EncodedFrameTimeMeasured(int encode_duration_ms);
bool IsOverusing(const CpuOveruseMetrics& metrics);
bool IsUnderusing(const CpuOveruseMetrics& metrics, int64_t time_now);
bool FrameTimeoutDetected(int64_t now) const;
bool FrameSizeChanged(int num_pixels) const;
void ResetAll(int num_pixels);
static std::unique_ptr<ProcessingUsage> CreateProcessingUsage(
const CpuOveruseOptions& options);
rtc::SequencedTaskChecker task_checker_;
// Owned by the task queue from where StartCheckForOveruse is called.
CheckOveruseTask* check_overuse_task_;
const CpuOveruseOptions options_;
// Stats metrics.
CpuOveruseMetricsObserver* const metrics_observer_;
rtc::Optional<CpuOveruseMetrics> metrics_ RTC_GUARDED_BY(task_checker_);
int64_t num_process_times_ RTC_GUARDED_BY(task_checker_);
int64_t last_capture_time_us_ RTC_GUARDED_BY(task_checker_);
// Number of pixels of last captured frame.
int num_pixels_ RTC_GUARDED_BY(task_checker_);
int max_framerate_ RTC_GUARDED_BY(task_checker_);
int64_t last_overuse_time_ms_ RTC_GUARDED_BY(task_checker_);
int checks_above_threshold_ RTC_GUARDED_BY(task_checker_);
int num_overuse_detections_ RTC_GUARDED_BY(task_checker_);
int64_t last_rampup_time_ms_ RTC_GUARDED_BY(task_checker_);
bool in_quick_rampup_ RTC_GUARDED_BY(task_checker_);
int current_rampup_delay_ms_ RTC_GUARDED_BY(task_checker_);
const std::unique_ptr<ProcessingUsage> usage_
} // namespace webrtc