зеркало из https://github.com/mozilla/gecko-dev.git
48 строки
1.4 KiB
C
48 строки
1.4 KiB
C
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this file,
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* You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef mozilla_dom_audiofocusmanager_h__
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#define mozilla_dom_audiofocusmanager_h__
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#include "base/basictypes.h"
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#include "nsTArray.h"
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namespace mozilla {
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namespace dom {
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class MediaControlService;
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/**
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* AudioFocusManager is used to assign the audio focus to different requester
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* and decide which requester can own audio focus when audio competing happens.
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* When the audio competing happens, the last request would be a winner who can
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* still own the audio focus, and all the other requesters would lose the audio
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* focus. Now MediaController is the onlt requester, it would request the audio
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* focus when it becomes audible and revoke the audio focus when the controller
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* is no longer active.
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*/
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class AudioFocusManager {
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public:
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void RequestAudioFocus(uint64_t aId);
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void RevokeAudioFocus(uint64_t aId);
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explicit AudioFocusManager(MediaControlService* aService);
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~AudioFocusManager() = default;
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uint32_t GetAudioFocusNums() const;
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private:
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friend class MediaControlService;
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void Shutdown();
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void HandleAudioCompetition(uint64_t aId);
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RefPtr<MediaControlService> mService;
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nsTArray<uint64_t> mOwningFocusControllers;
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};
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} // namespace dom
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} // namespace mozilla
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#endif // mozilla_dom_audiofocusmanager_h__
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