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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 COMPONENTS_VIZ_SERVICE_FRAME_SINKS_VIDEO_DETECTOR_H_
#define COMPONENTS_VIZ_SERVICE_FRAME_SINKS_VIDEO_DETECTOR_H_
#include <unordered_map>
#include "base/sequenced_task_runner.h"
#include "base/time/default_tick_clock.h"
#include "base/timer/timer.h"
#include "components/viz/common/surfaces/frame_sink_id.h"
#include "components/viz/service/surfaces/surface_observer.h"
#include "components/viz/service/viz_service_export.h"
#include "mojo/public/cpp/bindings/interface_ptr_set.h"
#include "services/viz/public/interfaces/compositing/video_detector_observer.mojom.h"
namespace viz {
class SurfaceManager;
class VideoDetectorTest;
// Watches for updates to clients and tries to detect when a video is playing.
// If a client sends CompositorFrames with damages of size at least
// |kMinDamageWidth| x |kMinDamageHeight| at the rate of at least
// |kMinFramesPerSecond| for the duration of at least |kMinVideoDuration| then
// we say it is playing video. We err on the side of false positives and can be
// fooled by things like continuous scrolling of a page.
class VIZ_SERVICE_EXPORT VideoDetector : public SurfaceObserver {
public:
VideoDetector(
const std::vector<FrameSinkId>& registered_frame_sink_ids,
SurfaceManager* surface_manager,
const base::TickClock* tick_clock = base::DefaultTickClock::GetInstance(),
scoped_refptr<base::SequencedTaskRunner> task_runner = nullptr);
virtual ~VideoDetector();
// Adds an observer. The observer can be removed by closing the mojo
// connection.
void AddObserver(mojom::VideoDetectorObserverPtr observer);
// When a FrameSinkId is registered/invalidated, we need to insert/delete the
// corresponding entry in client_infos_.
void OnFrameSinkIdRegistered(const FrameSinkId& frame_sink_id);
void OnFrameSinkIdInvalidated(const FrameSinkId& frame_sink_id);
private:
friend class VideoDetectorTest;
class ClientInfo;
// Minimum dimensions in pixels that damages must have to be considered a
// potential video frame.
static constexpr int kMinDamageWidth = 333;
static constexpr int kMinDamageHeight = 250;
// Number of video-sized updates that we must see within a second in a client
// before we assume that a video is playing.
static constexpr int kMinFramesPerSecond = 15;
// Timeout after which video is no longer considered to be playing.
static constexpr base::TimeDelta kVideoTimeout =
base::TimeDelta::FromMilliseconds(1000);
// Duration video must be playing in a client before it is reported to
// observers.
static constexpr base::TimeDelta kMinVideoDuration =
base::TimeDelta::FromMilliseconds(3000);
// If no video activity is detected for |kVideoTimeout|, this
// method will be called by |video_inactive_timer_|;
void OnVideoActivityEnded();
// SurfaceObserver implementation.
void OnSurfaceCreated(const SurfaceId& surface_id) override {}
void OnFirstSurfaceActivation(const SurfaceInfo& surface_info) override {}
void OnSurfaceActivated(const SurfaceId& surface_id,
base::Optional<base::TimeDelta> duration) override {}
void OnSurfaceDestroyed(const SurfaceId& surface_id) override {}
bool OnSurfaceDamaged(const SurfaceId& surface_id,
const BeginFrameAck& ack) override;
void OnSurfaceDiscarded(const SurfaceId& surface_id) override {}
void OnSurfaceDamageExpected(const SurfaceId& surface_id,
const BeginFrameArgs& args) override {}
void OnSurfaceWillBeDrawn(Surface* surface) override;
// True if video has been observed in the last |kVideoTimeout|.
bool video_is_playing_ = false;
// Provides the current time.
const base::TickClock* tick_clock_;
// Calls OnVideoActivityEnded() after |kVideoTimeout|. Uses |tick_clock_| to
// measure time.
base::OneShotTimer video_inactive_timer_;
// Contains information used for determining video activity in each client.
base::flat_map<FrameSinkId, std::unique_ptr<ClientInfo>> client_infos_;
// Observers that are interested to know about video activity. We only detect
// video activity if there is at least one client.
mojo::InterfacePtrSet<mojom::VideoDetectorObserver> observers_;
SurfaceManager* const surface_manager_;
DISALLOW_COPY_AND_ASSIGN(VideoDetector);
};
} // namespace viz
#endif // COMPONENTS_VIZ_SERVICE_FRAME_SINKS_VIDEO_DETECTOR_H_
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