| // 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 MEDIA_AUDIO_MAC_AUDIO_DEVICE_LISTENER_MAC_H_ |
| #define MEDIA_AUDIO_MAC_AUDIO_DEVICE_LISTENER_MAC_H_ |
| |
| #include <CoreAudio/AudioHardware.h> |
| |
| #include "base/basictypes.h" |
| #include "base/callback.h" |
| #include "base/threading/thread_checker.h" |
| #include "media/base/media_export.h" |
| |
| namespace media { |
| |
| // AudioDeviceListenerMac facilitates execution of device listener callbacks |
| // issued via CoreAudio. |
| class MEDIA_EXPORT AudioDeviceListenerMac { |
| public: |
| // |listener_cb| will be called when a device change occurs; it's a permanent |
| // callback and must outlive AudioDeviceListenerMac. Note that |listener_cb| |
| // might not be executed on the same thread as construction. |
| explicit AudioDeviceListenerMac(const base::Closure& listener_cb); |
| ~AudioDeviceListenerMac(); |
| |
| private: |
| friend class AudioDeviceListenerMacTest; |
| static const AudioObjectPropertyAddress kDeviceChangePropertyAddress; |
| |
| static OSStatus OnDefaultDeviceChanged( |
| AudioObjectID object, UInt32 num_addresses, |
| const AudioObjectPropertyAddress addresses[], void* context); |
| |
| base::Closure listener_cb_; |
| |
| // AudioDeviceListenerMac must be constructed and destructed on the same |
| // thread. |
| base::ThreadChecker thread_checker_; |
| |
| DISALLOW_COPY_AND_ASSIGN(AudioDeviceListenerMac); |
| }; |
| |
| } // namespace media |
| |
| #endif // MEDIA_AUDIO_MAC_AUDIO_DEVICE_LISTENER_MAC_H_ |