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// Copyright 2014 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 ASH_SYSTEM_AUDIO_AUDIO_OBSERVER_H_
#define ASH_SYSTEM_AUDIO_AUDIO_OBSERVER_H_
#include <stdint.h>
namespace ash {
class AudioObserver {
public:
virtual ~AudioObserver() {}
// Called when an active output device's volume changed.
// |node_id|: id of the active node.
// |volume|: volume as a percentage, 0.0 -- 100.0.
virtual void OnOutputNodeVolumeChanged(uint64_t node_id, double volume) = 0;
// Called when output mute state changed.
// |mute_on|: True if output is muted.
// |system_adjust|: True if the mute state is adjusted by the system
// automatically, UI should be consistent with the system's mute state,
// but it should not be too loud, e.g., the volume pop up window should not
// be triggered.
virtual void OnOutputMuteChanged(bool mute_on, bool system_adjust) = 0;
// Called when audio nodes changed.
virtual void OnAudioNodesChanged() = 0;
// Called when active audio output node changed.
virtual void OnActiveOutputNodeChanged() = 0;
// Called when active audio input node changed.
virtual void OnActiveInputNodeChanged() = 0;
};
} // namespace ash
#endif // ASH_SYSTEM_AUDIO_AUDIO_OBSERVER_H_
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