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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.
#ifndef CONTENT_BROWSER_DEVICE_MONITOR_MAC_H_
#define CONTENT_BROWSER_DEVICE_MONITOR_MAC_H_
#include "base/basictypes.h"
#include "base/system_monitor/system_monitor.h"
#include "base/threading/thread_checker.h"
namespace {
class DeviceMonitorMacImpl;
}
namespace content {
// Class to track audio/video devices removal or addition via callback to
// base::SystemMonitor ProcessDevicesChanged(). A single object of this class
// is created from the browser main process and lives as long as this one.
class DeviceMonitorMac {
public:
DeviceMonitorMac();
~DeviceMonitorMac();
// Registers the observers for the audio/video device removal, connection and
// suspension. The AVFoundation library is also loaded and initialised if the
// OS supports it. The |device_task_runner| argument represents the thread on
// which device enumeration will occur.
void StartMonitoring(
const scoped_refptr<base::SingleThreadTaskRunner>& device_task_runner);
// Method called by the internal DeviceMonitorMacImpl object
// |device_monitor_impl_| when a device of type |type| has been added to or
// removed from the system. This code executes in the notification thread
// (QTKit or AVFoundation).
void NotifyDeviceChanged(base::SystemMonitor::DeviceType type);
private:
scoped_ptr<DeviceMonitorMacImpl> device_monitor_impl_;
// |thread_checker_| is used to check that constructor and StartMonitoring()
// are called in the correct thread, the UI thread, that also owns the object.
base::ThreadChecker thread_checker_;
DISALLOW_COPY_AND_ASSIGN(DeviceMonitorMac);
};
} // namespace content
#endif // CONTENT_BROWSER_DEVICE_MONITOR_MAC_H_
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