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video_detector.cc
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video_detector.cc
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// Copyright (c) 2012 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.
#include "ash/wm/video_detector.h"
#include "ash/common/wm/window_state.h"
#include "ash/common/wm_shell.h"
#include "ash/common/wm_window.h"
#include "ash/public/cpp/shell_window_ids.h"
#include "ash/shell.h"
#include "ash/wm/window_state_aura.h"
#include "ui/aura/env.h"
#include "ui/aura/window.h"
#include "ui/aura/window_event_dispatcher.h"
#include "ui/gfx/geometry/rect.h"
#include "ui/wm/core/window_util.h"
namespace ash {
const int VideoDetector::kMinUpdateWidth = 333;
const int VideoDetector::kMinUpdateHeight = 250;
const int VideoDetector::kMinFramesPerSecond = 15;
const int VideoDetector::kVideoTimeoutMs = 1000;
const int VideoDetector::kMinVideoDurationMs = 3000;
// Stores information about updates to a window and determines whether it's
// likely that a video is playing in it.
class VideoDetector::WindowInfo {
public:
WindowInfo() : buffer_start_(0), buffer_size_(0) {}
// Handles an update within a window, returning true if it appears that
// video is currently playing in the window.
bool RecordUpdateAndCheckForVideo(const gfx::Rect& region,
base::TimeTicks now) {
if (region.width() < kMinUpdateWidth || region.height() < kMinUpdateHeight)
return false;
// If the buffer is full, drop the first timestamp.
if (buffer_size_ == static_cast<size_t>(kMinFramesPerSecond)) {
buffer_start_ = (buffer_start_ + 1) % kMinFramesPerSecond;
buffer_size_--;
}
update_times_[(buffer_start_ + buffer_size_) % kMinFramesPerSecond] = now;
buffer_size_++;
const bool in_video =
(buffer_size_ == static_cast<size_t>(kMinFramesPerSecond)) &&
((now - update_times_[buffer_start_]).InSecondsF() <= 1.0);
if (in_video && video_start_time_.is_null())
video_start_time_ = update_times_[buffer_start_];
else if (!in_video && !video_start_time_.is_null())
video_start_time_ = base::TimeTicks();
const base::TimeDelta elapsed = now - video_start_time_;
return in_video &&
elapsed >= base::TimeDelta::FromMilliseconds(kMinVideoDurationMs);
}
private:
// Circular buffer containing update times of the last (up to
// |kMinFramesPerSecond|) video-sized updates to this window.
base::TimeTicks update_times_[kMinFramesPerSecond];
// Time at which the current sequence of updates that looks like video
// started. Empty if video isn't currently playing.
base::TimeTicks video_start_time_;
// Index into |update_times_| of the oldest update.
size_t buffer_start_;
// Number of updates stored in |update_times_|.
size_t buffer_size_;
DISALLOW_COPY_AND_ASSIGN(WindowInfo);
};
VideoDetector::VideoDetector()
: state_(State::NOT_PLAYING),
video_is_playing_(false),
window_observer_manager_(this),
is_shutting_down_(false) {
aura::Env::GetInstance()->AddObserver(this);
Shell::GetInstance()->AddShellObserver(this);
}
VideoDetector::~VideoDetector() {
Shell::GetInstance()->RemoveShellObserver(this);
aura::Env::GetInstance()->RemoveObserver(this);
}
void VideoDetector::AddObserver(Observer* observer) {
observers_.AddObserver(observer);
}
void VideoDetector::RemoveObserver(Observer* observer) {
observers_.RemoveObserver(observer);
}
bool VideoDetector::TriggerTimeoutForTest() {
if (!video_inactive_timer_.IsRunning())
return false;
video_inactive_timer_.Stop();
HandleVideoInactive();
return true;
}
void VideoDetector::OnWindowInitialized(aura::Window* window) {
window_observer_manager_.Add(window);
}
void VideoDetector::OnDelegatedFrameDamage(
aura::Window* window,
const gfx::Rect& damage_rect_in_dip) {
if (is_shutting_down_)
return;
std::unique_ptr<WindowInfo>& info = window_infos_[window];
if (!info.get())
info.reset(new WindowInfo);
base::TimeTicks now =
!now_for_test_.is_null() ? now_for_test_ : base::TimeTicks::Now();
if (info->RecordUpdateAndCheckForVideo(damage_rect_in_dip, now))
HandleVideoActivity(window, now);
}
void VideoDetector::OnWindowDestroying(aura::Window* window) {
if (fullscreen_root_windows_.count(window)) {
window_observer_manager_.Remove(window);
fullscreen_root_windows_.erase(window);
UpdateState();
}
}
void VideoDetector::OnWindowDestroyed(aura::Window* window) {
window_infos_.erase(window);
window_observer_manager_.Remove(window);
}
void VideoDetector::OnAppTerminating() {
// Stop checking video activity once the shutdown
// process starts. crbug.com/231696.
is_shutting_down_ = true;
}
void VideoDetector::OnFullscreenStateChanged(bool is_fullscreen,
WmWindow* root_window) {
aura::Window* aura_window = root_window->aura_window();
if (is_fullscreen && !fullscreen_root_windows_.count(aura_window)) {
fullscreen_root_windows_.insert(aura_window);
if (!window_observer_manager_.IsObserving(aura_window))
window_observer_manager_.Add(aura_window);
UpdateState();
} else if (!is_fullscreen && fullscreen_root_windows_.count(aura_window)) {
fullscreen_root_windows_.erase(aura_window);
window_observer_manager_.Remove(aura_window);
UpdateState();
}
}
void VideoDetector::HandleVideoActivity(aura::Window* window,
base::TimeTicks now) {
if (!window->IsVisible())
return;
gfx::Rect root_bounds = window->GetRootWindow()->bounds();
if (!window->GetBoundsInRootWindow().Intersects(root_bounds))
return;
video_is_playing_ = true;
video_inactive_timer_.Start(
FROM_HERE, base::TimeDelta::FromMilliseconds(kVideoTimeoutMs), this,
&VideoDetector::HandleVideoInactive);
UpdateState();
}
void VideoDetector::HandleVideoInactive() {
video_is_playing_ = false;
UpdateState();
}
void VideoDetector::UpdateState() {
State new_state = State::NOT_PLAYING;
if (video_is_playing_) {
new_state = fullscreen_root_windows_.empty() ? State::PLAYING_WINDOWED
: State::PLAYING_FULLSCREEN;
}
if (state_ != new_state) {
state_ = new_state;
for (auto& observer : observers_)
observer.OnVideoStateChanged(state_);
}
}
} // namespace ash