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// Copyright (c) 2011 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 CHROME_BROWSER_CHROMEOS_AUDIO_MIXER_H_
#define CHROME_BROWSER_CHROMEOS_AUDIO_MIXER_H_
#pragma once
#include "base/basictypes.h"
#include "base/callback_old.h"
namespace chromeos {
class AudioMixer {
public:
AudioMixer() {}
virtual ~AudioMixer() {}
// Initializes the connection to the device. This must be called on the UI
// thread; blocking tasks may take place in the background. IsInitialized()
// may be called to check if initialization is done.
virtual void Init() = 0;
// Returns true if device initialization is complete.
virtual bool IsInitialized() = 0;
// Returns the actual volume range available, according to the mixer.
// Values will be incorrect if called before initialization is complete.
virtual void GetVolumeLimits(double* min_volume_db,
double* max_volume_db) = 0;
// Gets the most-recently-set volume, in decibels.
virtual double GetVolumeDb() = 0;
// Sets the volume, in decibels.
// If initialization is still in progress, the value will be applied once
// initialization is complete.
virtual void SetVolumeDb(double volume_db) = 0;
// Gets the most-recently set mute state of the default device (true means
// muted).
virtual bool IsMuted() = 0;
// Sets the mute state of the default device.
// If initialization is still in progress, the value will be applied once
// initialization is complete.
virtual void SetMuted(bool mute) = 0;
private:
DISALLOW_COPY_AND_ASSIGN(AudioMixer);
};
} // namespace chromeos
#endif // CHROME_BROWSER_CHROMEOS_AUDIO_MIXER_H_
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