AudioFocusManager.h (1479B)
1 /* This Source Code Form is subject to the terms of the Mozilla Public 2 * License, v. 2.0. If a copy of the MPL was not distributed with this file, 3 * You can obtain one at http://mozilla.org/MPL/2.0/. */ 4 5 #ifndef DOM_MEDIA_MEDIACONTROL_AUDIOFOCUSMANAGER_H_ 6 #define DOM_MEDIA_MEDIACONTROL_AUDIOFOCUSMANAGER_H_ 7 8 #include "VideoUtils.h" 9 #include "base/basictypes.h" 10 #include "nsTArray.h" 11 12 namespace mozilla::dom { 13 14 class IMediaController; 15 class MediaControlService; 16 17 /** 18 * AudioFocusManager is used to assign the audio focus to different requester 19 * and decide which requester can own audio focus when audio competing happens. 20 * When the audio competing happens, the last request would be a winner who can 21 * still own the audio focus, and all the other requesters would lose the audio 22 * focus. Now MediaController is the onlt requester, it would request the audio 23 * focus when it becomes audible and revoke the audio focus when the controller 24 * is no longer active. 25 */ 26 class AudioFocusManager { 27 public: 28 void RequestAudioFocus(IMediaController* aController); 29 void RevokeAudioFocus(IMediaController* aController); 30 31 explicit AudioFocusManager() = default; 32 ~AudioFocusManager() = default; 33 34 uint32_t GetAudioFocusNums() const; 35 36 private: 37 friend class MediaControlService; 38 void ClearFocusControllersIfNeeded(); 39 40 nsTArray<RefPtr<IMediaController>> mOwningFocusControllers; 41 }; 42 43 } // namespace mozilla::dom 44 45 #endif // DOM_MEDIA_MEDIACONTROL_AUDIOFOCUSMANAGER_H_