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// Copyright 2017 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef MEDIA_GPU_ANDROID_PROMOTION_HINT_AGGREGATOR_IMPL_H_
#define MEDIA_GPU_ANDROID_PROMOTION_HINT_AGGREGATOR_IMPL_H_
#include "base/bind.h"
#include "base/macros.h"
#include "base/memory/weak_ptr.h"
#include "base/time/tick_clock.h"
#include "media/gpu/android/promotion_hint_aggregator.h"
#include "media/gpu/media_gpu_export.h"
namespace media {
// Receive lots of promotion hints, and aggregate them into a single signal.
class MEDIA_GPU_EXPORT PromotionHintAggregatorImpl
: public PromotionHintAggregator {
public:
// |tick_clock| may be null, in which case we will use wall clock. If it is
// not null, then it must outlive |this|. It is provided for tests.
PromotionHintAggregatorImpl(const base::TickClock* tick_clock = nullptr);
PromotionHintAggregatorImpl(const PromotionHintAggregatorImpl&) = delete;
PromotionHintAggregatorImpl& operator=(const PromotionHintAggregatorImpl&) =
delete;
~PromotionHintAggregatorImpl() override;
void NotifyPromotionHint(const Hint& hint) override;
bool IsSafeToPromote() override;
private:
// Clock, which we might not own, that we'll use.
const base::TickClock* tick_clock_;
// When did we receive the most recent "not promotable" frame?
base::TimeTicks most_recent_unpromotable_;
// When did we last receive an update?
base::TimeTicks most_recent_update_;
// Number of frames which were promotable in a row.
int consecutive_promotable_frames_ = 0;
base::WeakPtrFactory<PromotionHintAggregatorImpl> weak_ptr_factory_{this};
};
} // namespace media
#endif // MEDIA_GPU_ANDROID_PROMOTION_HINT_AGGREGATOR_IMPL_H_
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