JUCE/modules/juce_audio_devices/audio_io/juce_SystemAudioVolume.h

/*
  ==============================================================================

   This file is part of the JUCE library - "Jules' Utility Class Extensions"
   Copyright 2004-11 by Raw Material Software Ltd.

  ------------------------------------------------------------------------------

   JUCE can be redistributed and/or modified under the terms of the GNU General
   Public License (Version 2), as published by the Free Software Foundation.
   A copy of the license is included in the JUCE distribution, or can be found
   online at www.gnu.org/licenses.

   JUCE is distributed in the hope that it will be useful, but WITHOUT ANY
   WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
   A PARTICULAR PURPOSE.  See the GNU General Public License for more details.

  ------------------------------------------------------------------------------

   To release a closed-source product which uses JUCE, commercial licenses are
   available: visit www.rawmaterialsoftware.com/juce for more information.

  ==============================================================================
*/

#ifndef __JUCE_SYSTEMAUDIOVOLUME_JUCEHEADER__
#define __JUCE_SYSTEMAUDIOVOLUME_JUCEHEADER__

//==============================================================================
/**
    Contains functions to control the system's master volume.
*/
class JUCE_API  SystemAudioVolume
{
public:
    //==============================================================================
    /** Returns the operating system's current volume level in the range 0 to 1.0 */
    static float JUCE_CALLTYPE getGain();

    /** Attempts to set the operating system's current volume level.
        @newGain the level, between 0 and 1.0
        @returns true if the operation succeeds
    */
    static bool JUCE_CALLTYPE setGain (float newGain);

    /** Returns true if the system's audio output is currently muted. */
    static bool JUCE_CALLTYPE isMuted();

    /** Attempts to mute the operating system's audio output.
        @shouldBeMuted true if you want it to be muted
        @returns true if the operation succeeds
    */
    static bool JUCE_CALLTYPE setMuted (bool shouldBeMuted);

private:
    SystemAudioVolume(); // Don't instantiate this class, just call its static fns.
    JUCE_DECLARE_NON_COPYABLE (SystemAudioVolume)
};


#endif   // __JUCE_SYSTEMAUDIOVOLUME_JUCEHEADER__