content/browser/device_monitor_mac.mm

   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 "content/browser/device_monitor_mac.h"
   6
   7 #import <QTKit/QTKit.h>
   8
   9 #include "base/logging.h"
  10
  11 namespace content {
  12
  13 class DeviceMonitorMac::QTMonitorImpl {
  14  public:
  15   explicit QTMonitorImpl(DeviceMonitorMac* monitor);
  16   virtual ~QTMonitorImpl() {}
  17
  18   void Start();
  19   void Stop();
  20
  21  private:
  22   void OnDeviceChanged();
  23
  24   DeviceMonitorMac* monitor_;
  25   int number_audio_devices_;
  26   int number_video_devices_;
  27   id device_arrival_;
  28   id device_removal_;
  29
  30   DISALLOW_COPY_AND_ASSIGN(QTMonitorImpl);
  31 };
  32
  33 DeviceMonitorMac::QTMonitorImpl::QTMonitorImpl(DeviceMonitorMac* monitor)
  34     : monitor_(monitor),
  35       number_audio_devices_(0),
  36       number_video_devices_(0),
  37       device_arrival_(nil),
  38       device_removal_(nil) {
  39   DCHECK(monitor);
  40 }
  41
  42 void DeviceMonitorMac::QTMonitorImpl::Start() {
  43   NSNotificationCenter* nc = [NSNotificationCenter defaultCenter];
  44   device_arrival_ =
  45     [nc addObserverForName:QTCaptureDeviceWasConnectedNotification
  46                     object:nil
  47                      queue:nil
  48                 usingBlock:^(NSNotification* notification) {
  49                     OnDeviceChanged();}];
  50
  51   device_removal_ =
  52       [nc addObserverForName:QTCaptureDeviceWasDisconnectedNotification
  53                       object:nil
  54                        queue:nil
  55                   usingBlock:^(NSNotification* notification) {
  56                       OnDeviceChanged();}];
  57 }
  58
  59 void DeviceMonitorMac::QTMonitorImpl::Stop() {
  60   if (!monitor_)
  61     return;
  62
  63   NSNotificationCenter* nc = [NSNotificationCenter defaultCenter];
  64   [nc removeObserver:device_arrival_];
  65   [nc removeObserver:device_removal_];
  66 }
  67
  68 void DeviceMonitorMac::QTMonitorImpl::OnDeviceChanged() {
  69   NSArray* devices = [QTCaptureDevice inputDevices];
  70   int number_video_devices = 0;
  71   int number_audio_devices = 0;
  72   for (QTCaptureDevice* device in devices) {
  73     if ([device hasMediaType:QTMediaTypeVideo] ||
  74         [device hasMediaType:QTMediaTypeMuxed])
  75       ++number_video_devices;
  76
  77     if ([device hasMediaType:QTMediaTypeSound] ||
  78         [device hasMediaType:QTMediaTypeMuxed])
  79       ++number_audio_devices;
  80   }
  81
  82   if (number_video_devices_ != number_video_devices) {
  83     number_video_devices_ = number_video_devices;
  84     monitor_->NotifyDeviceChanged(base::SystemMonitor::DEVTYPE_VIDEO_CAPTURE);
  85   }
  86
  87   if (number_audio_devices_ != number_audio_devices) {
  88     number_audio_devices_ = number_audio_devices;
  89     monitor_->NotifyDeviceChanged(base::SystemMonitor::DEVTYPE_AUDIO_CAPTURE);
  90   }
  91 }
  92
  93 DeviceMonitorMac::DeviceMonitorMac() {
  94   qt_monitor_.reset(new QTMonitorImpl(this));
  95   qt_monitor_->Start();
  96 }
  97
  98 DeviceMonitorMac::~DeviceMonitorMac() {
  99   qt_monitor_->Stop();
 100 }
 101
 102 void DeviceMonitorMac::NotifyDeviceChanged(
 103     base::SystemMonitor::DeviceType type) {
 104   // TODO(xians): Remove the global variable for SystemMonitor.
 105   base::SystemMonitor::Get()->ProcessDevicesChanged(type);
 106 }
 107
 108 }  // namespace content