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// 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 CHROME_BROWSER_CHROMEOS_AUDIO_AUDIO_MIXER_H_
#define CHROME_BROWSER_CHROMEOS_AUDIO_AUDIO_MIXER_H_
#include "base/basictypes.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. Note that the
// other methods in this interface can be called before Init().
virtual void Init() = 0;
// Returns the most-recently-set volume, in the range [0.0, 100.0].
virtual double GetVolumePercent() = 0;
// Sets the volume, possibly asynchronously.
// |percent| should be in the range [0.0, 100.0].
virtual void SetVolumePercent(double percent) = 0;
// Is the device currently muted?
virtual bool IsMuted() = 0;
// Mutes or unmutes the device, possibly asynchronously. The caller must
// first verify that the mute state is not locked by calling IsMuteLocked.
virtual void SetMuted(bool mute) = 0;
// Is the device's mute state currently locked?
virtual bool IsMuteLocked() = 0;
// Locks the mute state of the device to whatever state it currently is in.
// Call SetMuteLocked with false to allow changing the mute state again.
virtual void SetMuteLocked(bool locked) = 0;
// Is the capture device currently muted?
virtual bool IsCaptureMuted() = 0;
// Mutes or unmutes the capture device, possible asynchronously. The caller
// must first verify that the mute state is not locked by calling
// IsCaptureMuteLocked.
virtual void SetCaptureMuted(bool mute) = 0;
// Is the capture device's mute state currently locked?
virtual bool IsCaptureMuteLocked() = 0;
// Locks the capture mute state of the device.
virtual void SetCaptureMuteLocked(bool locked) = 0;
private:
DISALLOW_COPY_AND_ASSIGN(AudioMixer);
};
} // namespace chromeos
#endif // CHROME_BROWSER_CHROMEOS_AUDIO_AUDIO_MIXER_H_
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