1// Copyright (c) 2012 The Chromium Authors. All rights reserved. 2// Use of this source code is governed by a BSD-style license that can be 3// found in the LICENSE file. 4 5#include "ash/wm/video_detector.h" 6 7#include "ash/shell.h" 8#include "ash/shell_window_ids.h" 9#include "ash/wm/window_state.h" 10#include "ui/aura/env.h" 11#include "ui/aura/window.h" 12#include "ui/aura/window_event_dispatcher.h" 13#include "ui/gfx/rect.h" 14#include "ui/wm/core/window_util.h" 15 16namespace ash { 17 18const int VideoDetector::kMinUpdateWidth = 333; 19const int VideoDetector::kMinUpdateHeight = 250; 20const int VideoDetector::kMinFramesPerSecond = 15; 21const double VideoDetector::kNotifyIntervalSec = 1.0; 22 23// Stores information about updates to a window and determines whether it's 24// likely that a video is playing in it. 25class VideoDetector::WindowInfo { 26 public: 27 WindowInfo() : buffer_start_(0), buffer_size_(0) {} 28 29 // Handles an update within a window, returning true if it appears that 30 // video is currently playing in the window. 31 bool RecordUpdateAndCheckForVideo(const gfx::Rect& region, 32 base::TimeTicks now) { 33 if (region.width() < kMinUpdateWidth || region.height() < kMinUpdateHeight) 34 return false; 35 36 // If the buffer is full, drop the first timestamp. 37 if (buffer_size_ == static_cast<size_t>(kMinFramesPerSecond)) { 38 buffer_start_ = (buffer_start_ + 1) % kMinFramesPerSecond; 39 buffer_size_--; 40 } 41 42 update_times_[(buffer_start_ + buffer_size_) % kMinFramesPerSecond] = now; 43 buffer_size_++; 44 45 return buffer_size_ == static_cast<size_t>(kMinFramesPerSecond) && 46 (now - update_times_[buffer_start_]).InSecondsF() <= 1.0; 47 } 48 49 private: 50 // Circular buffer containing update times of the last (up to 51 // |kMinFramesPerSecond|) video-sized updates to this window. 52 base::TimeTicks update_times_[kMinFramesPerSecond]; 53 54 // Index into |update_times_| of the oldest update. 55 size_t buffer_start_; 56 57 // Number of updates stored in |update_times_|. 58 size_t buffer_size_; 59 60 DISALLOW_COPY_AND_ASSIGN(WindowInfo); 61}; 62 63VideoDetector::VideoDetector() 64 : observer_manager_(this), 65 is_shutting_down_(false) { 66 aura::Env::GetInstance()->AddObserver(this); 67 Shell::GetInstance()->AddShellObserver(this); 68} 69 70VideoDetector::~VideoDetector() { 71 Shell::GetInstance()->RemoveShellObserver(this); 72 aura::Env::GetInstance()->RemoveObserver(this); 73} 74 75void VideoDetector::AddObserver(VideoDetectorObserver* observer) { 76 observers_.AddObserver(observer); 77} 78 79void VideoDetector::RemoveObserver(VideoDetectorObserver* observer) { 80 observers_.RemoveObserver(observer); 81} 82 83void VideoDetector::OnWindowInitialized(aura::Window* window) { 84 observer_manager_.Add(window); 85} 86 87void VideoDetector::OnWindowPaintScheduled(aura::Window* window, 88 const gfx::Rect& region) { 89 if (is_shutting_down_) 90 return; 91 linked_ptr<WindowInfo>& info = window_infos_[window]; 92 if (!info.get()) 93 info.reset(new WindowInfo); 94 95 base::TimeTicks now = 96 !now_for_test_.is_null() ? now_for_test_ : base::TimeTicks::Now(); 97 if (info->RecordUpdateAndCheckForVideo(region, now)) 98 MaybeNotifyObservers(window, now); 99} 100 101void VideoDetector::OnWindowDestroyed(aura::Window* window) { 102 window_infos_.erase(window); 103 observer_manager_.Remove(window); 104} 105 106void VideoDetector::OnAppTerminating() { 107 // Stop checking video activity once the shutdown 108 // process starts. crbug.com/231696. 109 is_shutting_down_ = true; 110} 111 112void VideoDetector::MaybeNotifyObservers(aura::Window* window, 113 base::TimeTicks now) { 114 if (!last_observer_notification_time_.is_null() && 115 (now - last_observer_notification_time_).InSecondsF() < 116 kNotifyIntervalSec) 117 return; 118 119 if (!window->IsVisible()) 120 return; 121 122 gfx::Rect root_bounds = window->GetRootWindow()->bounds(); 123 if (!window->GetBoundsInRootWindow().Intersects(root_bounds)) 124 return; 125 126 // As a relatively-cheap way to avoid flipping back and forth between 127 // fullscreen and non-fullscreen notifications when one video is playing in a 128 // fullscreen window and a second video is playing in a non-fullscreen window, 129 // report fullscreen video whenever a fullscreen window exists on any desktop 130 // regardless of whether the video is actually playing in that window: 131 // http://crbug.com/340666 132 bool fullscreen_window_exists = false; 133 std::vector<aura::Window*> containers = 134 Shell::GetContainersFromAllRootWindows(kShellWindowId_DefaultContainer, 135 NULL); 136 for (std::vector<aura::Window*>::const_iterator container = 137 containers.begin(); container != containers.end(); ++container) { 138 const aura::Window::Windows& windows = (*container)->children(); 139 for (aura::Window::Windows::const_iterator window = windows.begin(); 140 window != windows.end(); ++window) { 141 if (wm::GetWindowState(*window)->IsFullscreen()) { 142 fullscreen_window_exists = true; 143 break; 144 } 145 } 146 } 147 148 FOR_EACH_OBSERVER(VideoDetectorObserver, 149 observers_, 150 OnVideoDetected(fullscreen_window_exists)); 151 last_observer_notification_time_ = now; 152} 153 154} // namespace ash 155