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/*
* Copyright (c) 2014 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 MODULES_VIDEO_CODING_UTILITY_QUALITY_SCALER_H_
#define MODULES_VIDEO_CODING_UTILITY_QUALITY_SCALER_H_
#include <utility>
#include "api/optional.h"
#include "api/video_codecs/video_encoder.h"
#include "common_types.h" // NOLINT(build/include)
#include "modules/video_coding/utility/moving_average.h"
#include "rtc_base/sequenced_task_checker.h"
namespace webrtc {
// An interface for signaling requests to limit or increase the resolution or
// framerate of the captured video stream.
class AdaptationObserverInterface {
public:
// Indicates if the adaptation is due to overuse of the CPU resources, or if
// the quality of the encoded frames have dropped too low.
enum AdaptReason : size_t { kQuality = 0, kCpu = 1 };
static const size_t kScaleReasonSize = 2;
// Called to signal that we can handle larger or more frequent frames.
virtual void AdaptUp(AdaptReason reason) = 0;
// Called to signal that the source should reduce the resolution or framerate.
virtual void AdaptDown(AdaptReason reason) = 0;
protected:
virtual ~AdaptationObserverInterface() {}
};
// QualityScaler runs asynchronously and monitors QP values of encoded frames.
// It holds a reference to an AdaptationObserverInterface implementation to
// signal an intent to scale up or down.
class QualityScaler {
public:
// Construct a QualityScaler with a given |observer|.
// This starts the quality scaler periodically checking what the average QP
// has been recently.
QualityScaler(AdaptationObserverInterface* observer,
VideoCodecType codec_type);
// If specific thresholds are desired these can be supplied as |thresholds|.
QualityScaler(AdaptationObserverInterface* observer,
VideoEncoder::QpThresholds thresholds);
virtual ~QualityScaler();
// Should be called each time the encoder drops a frame
void ReportDroppedFrame();
// Inform the QualityScaler of the last seen QP.
void ReportQP(int qp);
// The following members declared protected for testing purposes
protected:
QualityScaler(AdaptationObserverInterface* observer,
VideoEncoder::QpThresholds thresholds,
int64_t sampling_period);
private:
class CheckQPTask;
void CheckQP();
void ClearSamples();
void ReportQPLow();
void ReportQPHigh();
int64_t GetSamplingPeriodMs() const;
CheckQPTask* check_qp_task_ RTC_GUARDED_BY(&task_checker_);
AdaptationObserverInterface* const observer_ RTC_GUARDED_BY(&task_checker_);
rtc::SequencedTaskChecker task_checker_;
const int64_t sampling_period_ms_;
bool fast_rampup_ RTC_GUARDED_BY(&task_checker_);
MovingAverage average_qp_ RTC_GUARDED_BY(&task_checker_);
MovingAverage framedrop_percent_ RTC_GUARDED_BY(&task_checker_);
VideoEncoder::QpThresholds thresholds_ RTC_GUARDED_BY(&task_checker_);
};
} // namespace webrtc
#endif // MODULES_VIDEO_CODING_UTILITY_QUALITY_SCALER_H_
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