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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/shell.h"
#include "ash/wm/window_state.h"
#include "ui/aura/env.h"
#include "ui/aura/root_window.h"
#include "ui/aura/window.h"
#include "ui/gfx/rect.h"
#include "ui/views/corewm/window_util.h"
namespace ash {
const int VideoDetector::kMinUpdateWidth = 333;
const int VideoDetector::kMinUpdateHeight = 250;
const int VideoDetector::kMinFramesPerSecond = 15;
const double VideoDetector::kNotifyIntervalSec = 1.0;
// 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_++;
return buffer_size_ == static_cast<size_t>(kMinFramesPerSecond) &&
(now - update_times_[buffer_start_]).InSecondsF() <= 1.0;
}
private:
// Circular buffer containing update times of the last (up to
// |kMinFramesPerSecond|) video-sized updates to this window.
base::TimeTicks update_times_[kMinFramesPerSecond];
// 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()
: 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(VideoDetectorObserver* observer) {
observers_.AddObserver(observer);
}
void VideoDetector::RemoveObserver(VideoDetectorObserver* observer) {
observers_.RemoveObserver(observer);
}
void VideoDetector::OnWindowInitialized(aura::Window* window) {
observer_manager_.Add(window);
}
void VideoDetector::OnWindowPaintScheduled(aura::Window* window,
const gfx::Rect& region) {
if (is_shutting_down_)
return;
linked_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(region, now))
MaybeNotifyObservers(window, now);
}
void VideoDetector::OnWindowDestroyed(aura::Window* window) {
window_infos_.erase(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::MaybeNotifyObservers(aura::Window* window,
base::TimeTicks now) {
if (!last_observer_notification_time_.is_null() &&
(now - last_observer_notification_time_).InSecondsF() <
kNotifyIntervalSec)
return;
if (!window->IsVisible())
return;
gfx::Rect root_bounds = window->GetRootWindow()->bounds();
if (!window->GetBoundsInRootWindow().Intersects(root_bounds))
return;
aura::Window* toplevel_window = views::corewm::GetToplevelWindow(window);
bool is_fullscreen = toplevel_window ?
wm::GetWindowState(toplevel_window)->IsFullscreen() : false;
FOR_EACH_OBSERVER(VideoDetectorObserver,
observers_,
OnVideoDetected(is_fullscreen));
last_observer_notification_time_ = now;
}
} // namespace ash
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