New class: SystemAudioVolume to control the OS's master volume. (Implemented only for OSX and Windows)

extras/JuceDemo/Builds/MacOSX/Juce Demo.xcodeproj/project.pbxproj

@@ -191,6 +191,7 @@
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+		2611C1565EA108120C0E1B7F = { isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; name = "juce_SystemAudioVolume.h"; path = "../../../../modules/juce_audio_devices/audio_io/juce_SystemAudioVolume.h"; sourceTree = "SOURCE_ROOT"; };
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@@ -850,9 +851,8 @@
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+		E48615F1F7D8213F6DC24FC9 = { isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; name = "juce_ThreadPool.h"; path = "../../../../modules/juce_core/threads/juce_ThreadPool.h"; sourceTree = "SOURCE_ROOT"; };
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@@ -863,13 +863,14 @@
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+		E2732267CD7C0C3BDB17456A = { isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; name = "juce_BooleanPropertyComponent.h"; path = "../../../../modules/juce_gui_basics/properties/juce_BooleanPropertyComponent.h"; sourceTree = "SOURCE_ROOT"; };
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+		E48E2824CED9933934127522 = { isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; name = "juce_BasicNativeHeaders.h"; path = "../../../../modules/juce_core/native/juce_BasicNativeHeaders.h"; sourceTree = "SOURCE_ROOT"; };
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@@ -1050,7 +1051,8 @@
 				F9474BBBA977F050C5C66E61,
 				785F32963F7F6458F3D4DC3D,
 				94EB4630C360BA31195FA13D,
-				EA20E7FB414DD777C1618333 ); name = "audio_io"; sourceTree = "<group>"; };
+				EA20E7FB414DD777C1618333,
+				2611C1565EA108120C0E1B7F ); name = "audio_io"; sourceTree = "<group>"; };
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extras/JuceDemo/Builds/VisualStudio2005/Juce Demo.vcproj

@@ -475,6 +475,7 @@
             </FileConfiguration>
           </File>
           <File RelativePath="..\..\..\..\modules\juce_audio_devices\audio_io\juce_AudioIODeviceType.h"/>
+          <File RelativePath="..\..\..\..\modules\juce_audio_devices\audio_io\juce_SystemAudioVolume.h"/>
         </Filter>
         <Filter Name="midi_io">
           <File RelativePath="..\..\..\..\modules\juce_audio_devices\midi_io\juce_MidiInput.h"/>

extras/JuceDemo/Builds/VisualStudio2008/Juce Demo.vcproj

@@ -475,6 +475,7 @@
             </FileConfiguration>
           </File>
           <File RelativePath="..\..\..\..\modules\juce_audio_devices\audio_io\juce_AudioIODeviceType.h"/>
+          <File RelativePath="..\..\..\..\modules\juce_audio_devices\audio_io\juce_SystemAudioVolume.h"/>
         </Filter>
         <Filter Name="midi_io">
           <File RelativePath="..\..\..\..\modules\juce_audio_devices\midi_io\juce_MidiInput.h"/>

extras/JuceDemo/Builds/VisualStudio2010/Juce Demo.vcxproj

@@ -1260,6 +1260,7 @@
     <ClInclude Include="..\..\..\..\modules\juce_audio_devices\audio_io\juce_AudioDeviceManager.h"/>
     <ClInclude Include="..\..\..\..\modules\juce_audio_devices\audio_io\juce_AudioIODevice.h"/>
     <ClInclude Include="..\..\..\..\modules\juce_audio_devices\audio_io\juce_AudioIODeviceType.h"/>
+    <ClInclude Include="..\..\..\..\modules\juce_audio_devices\audio_io\juce_SystemAudioVolume.h"/>
     <ClInclude Include="..\..\..\..\modules\juce_audio_devices\midi_io\juce_MidiInput.h"/>
     <ClInclude Include="..\..\..\..\modules\juce_audio_devices\midi_io\juce_MidiMessageCollector.h"/>
     <ClInclude Include="..\..\..\..\modules\juce_audio_devices\midi_io\juce_MidiOutput.h"/>

extras/JuceDemo/Builds/VisualStudio2010/Juce Demo.vcxproj.filters

@@ -1662,6 +1662,9 @@
     <ClInclude Include="..\..\..\..\modules\juce_audio_devices\audio_io\juce_AudioIODeviceType.h">
       <Filter>Juce Modules\juce_audio_devices\audio_io</Filter>
     </ClInclude>
+    <ClInclude Include="..\..\..\..\modules\juce_audio_devices\audio_io\juce_SystemAudioVolume.h">
+      <Filter>Juce Modules\juce_audio_devices\audio_io</Filter>
+    </ClInclude>
     <ClInclude Include="..\..\..\..\modules\juce_audio_devices\midi_io\juce_MidiInput.h">
       <Filter>Juce Modules\juce_audio_devices\midi_io</Filter>
     </ClInclude>

extras/JuceDemo/Builds/iOS/Juce Demo.xcodeproj/project.pbxproj

@@ -184,6 +184,7 @@
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@@ -823,9 +824,11 @@
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+		D8AFC87A918360FFC9D96BE5 = { isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; name = "juce_Atomic.h"; path = "../../../../modules/juce_core/memory/juce_Atomic.h"; sourceTree = "SOURCE_ROOT"; };
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+		DB507A1F7BB7489344FF90A9 = { isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; name = "juce_Range.h"; path = "../../../../modules/juce_core/maths/juce_Range.h"; sourceTree = "SOURCE_ROOT"; };
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@@ -834,24 +837,23 @@
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@@ -859,7 +861,6 @@
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@@ -782,6 +782,7 @@
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+		D6AAFDF09C8BA44829B73655 = { isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; name = "juce_SystemAudioVolume.h"; path = "../../../../modules/juce_audio_devices/audio_io/juce_SystemAudioVolume.h"; sourceTree = "SOURCE_ROOT"; };
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@@ -998,7 +999,8 @@
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 				67DF7D8633F8D4704F4BF3CF,
 				0179C530BA4B4B8215461D5B,
-				4D57626C71E0A81969B64FFD ); name = "audio_io"; sourceTree = "<group>"; };
+				4D57626C71E0A81969B64FFD,
+				D6AAFDF09C8BA44829B73655 ); name = "audio_io"; sourceTree = "<group>"; };
 		246D4BBDD8FD3B0A2F39796B = { isa = PBXGroup; children = (
 				6290D23F5E4D1E3D6F4F182A,
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extras/audio plugin demo/Builds/VisualStudio2005/JuceDemoPlugin.vcproj

@@ -393,6 +393,7 @@
             </FileConfiguration>
           </File>
           <File RelativePath="..\..\..\..\modules\juce_audio_devices\audio_io\juce_AudioIODeviceType.h"/>
+          <File RelativePath="..\..\..\..\modules\juce_audio_devices\audio_io\juce_SystemAudioVolume.h"/>
         </Filter>
         <Filter Name="midi_io">
           <File RelativePath="..\..\..\..\modules\juce_audio_devices\midi_io\juce_MidiInput.h"/>

extras/audio plugin demo/Builds/VisualStudio2008/JuceDemoPlugin.vcproj

@@ -393,6 +393,7 @@
             </FileConfiguration>
           </File>
           <File RelativePath="..\..\..\..\modules\juce_audio_devices\audio_io\juce_AudioIODeviceType.h"/>
+          <File RelativePath="..\..\..\..\modules\juce_audio_devices\audio_io\juce_SystemAudioVolume.h"/>
         </Filter>
         <Filter Name="midi_io">
           <File RelativePath="..\..\..\..\modules\juce_audio_devices\midi_io\juce_MidiInput.h"/>

extras/audio plugin host/Builds/MacOSX/Plugin Host.xcodeproj/project.pbxproj

@@ -616,6 +616,7 @@
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+		AC3115EF08961FE738E897E6 = { isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; name = "juce_SystemAudioVolume.h"; path = "../../../../modules/juce_audio_devices/audio_io/juce_SystemAudioVolume.h"; sourceTree = "SOURCE_ROOT"; };
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@@ -721,7 +722,6 @@
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-		CAEA69EBB9B2A4C60A991E80 = { isa = PBXFileReference; lastKnownFileType = sourcecode.cpp.cpp; name = "juce_MidiKeyboardComponent.cpp"; path = "../../../../modules/juce_audio_utils/gui/juce_MidiKeyboardComponent.cpp"; sourceTree = "SOURCE_ROOT"; };
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@@ -756,6 +756,7 @@
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+		D7C1255A555A016BA0D98228 = { isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; name = "juce_cryptography.h"; path = "../../../../modules/juce_cryptography/juce_cryptography.h"; sourceTree = "SOURCE_ROOT"; };
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@@ -763,7 +764,6 @@
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-		DA9E577DC37123CEA41C4A71 = { isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; name = "juce_WaitableEvent.h"; path = "../../../../modules/juce_core/threads/juce_WaitableEvent.h"; sourceTree = "SOURCE_ROOT"; };
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@@ -776,13 +776,14 @@
 		E68018DE199135B7F738FB17 = { isa = PBXFileReference; lastKnownFileType = wrapper.framework; name = CoreAudioKit.framework; path = System/Library/Frameworks/CoreAudioKit.framework; sourceTree = SDKROOT; };
 		B2A7B6A8E3CCA7E2038E8EFF = { isa = PBXFileReference; explicitFileType = wrapper.application; includeInIndex = 0; path = "Plugin Host.app"; sourceTree = "BUILT_PRODUCTS_DIR"; };
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+		CAEA69EBB9B2A4C60A991E80 = { isa = PBXFileReference; lastKnownFileType = sourcecode.cpp.cpp; name = "juce_MidiKeyboardComponent.cpp"; path = "../../../../modules/juce_audio_utils/gui/juce_MidiKeyboardComponent.cpp"; sourceTree = "SOURCE_ROOT"; };
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+		DA9E577DC37123CEA41C4A71 = { isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; name = "juce_WaitableEvent.h"; path = "../../../../modules/juce_core/threads/juce_WaitableEvent.h"; sourceTree = "SOURCE_ROOT"; };
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@@ -971,7 +972,8 @@
 				E146C1CCDC8EA0498CD33E5D,
 				179DB0E297F9CA8700AFFD26,
 				ACEFDEF38DAB391EA33B0266,
-				986DCE49CDE712122B201CBA ); name = "audio_io"; sourceTree = "<group>"; };
+				986DCE49CDE712122B201CBA,
+				AC3115EF08961FE738E897E6 ); name = "audio_io"; sourceTree = "<group>"; };
 		211B416D62E7FBB52C0B58A0 = { isa = PBXGroup; children = (
 				C218366267FA66AF1AC8F328,
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extras/audio plugin host/Builds/VisualStudio2005/Plugin Host.vcproj

@@ -398,6 +398,7 @@
             </FileConfiguration>
           </File>
           <File RelativePath="..\..\..\..\modules\juce_audio_devices\audio_io\juce_AudioIODeviceType.h"/>
+          <File RelativePath="..\..\..\..\modules\juce_audio_devices\audio_io\juce_SystemAudioVolume.h"/>
         </Filter>
         <Filter Name="midi_io">
           <File RelativePath="..\..\..\..\modules\juce_audio_devices\midi_io\juce_MidiInput.h"/>

extras/audio plugin host/Builds/VisualStudio2008/Plugin Host.vcproj

@@ -398,6 +398,7 @@
             </FileConfiguration>
           </File>
           <File RelativePath="..\..\..\..\modules\juce_audio_devices\audio_io\juce_AudioIODeviceType.h"/>
+          <File RelativePath="..\..\..\..\modules\juce_audio_devices\audio_io\juce_SystemAudioVolume.h"/>
         </Filter>
         <Filter Name="midi_io">
           <File RelativePath="..\..\..\..\modules\juce_audio_devices\midi_io\juce_MidiInput.h"/>

extras/static library/Builds/VisualStudio2008/juce.vcproj

@@ -360,6 +360,7 @@
             </FileConfiguration>
           </File>
           <File RelativePath="..\..\..\..\modules\juce_audio_devices\audio_io\juce_AudioIODeviceType.h"/>
+          <File RelativePath="..\..\..\..\modules\juce_audio_devices\audio_io\juce_SystemAudioVolume.h"/>
         </Filter>
         <Filter Name="midi_io">
           <File RelativePath="..\..\..\..\modules\juce_audio_devices\midi_io\juce_MidiInput.h"/>

extras/static library/Builds/VisualStudio2010/juce.vcxproj

@@ -1228,6 +1228,7 @@
     <ClInclude Include="..\..\..\..\modules\juce_audio_devices\audio_io\juce_AudioDeviceManager.h"/>
     <ClInclude Include="..\..\..\..\modules\juce_audio_devices\audio_io\juce_AudioIODevice.h"/>
     <ClInclude Include="..\..\..\..\modules\juce_audio_devices\audio_io\juce_AudioIODeviceType.h"/>
+    <ClInclude Include="..\..\..\..\modules\juce_audio_devices\audio_io\juce_SystemAudioVolume.h"/>
     <ClInclude Include="..\..\..\..\modules\juce_audio_devices\midi_io\juce_MidiInput.h"/>
     <ClInclude Include="..\..\..\..\modules\juce_audio_devices\midi_io\juce_MidiMessageCollector.h"/>
     <ClInclude Include="..\..\..\..\modules\juce_audio_devices\midi_io\juce_MidiOutput.h"/>

extras/static library/Builds/VisualStudio2010/juce.vcxproj.filters

@@ -1563,6 +1563,9 @@
     <ClInclude Include="..\..\..\..\modules\juce_audio_devices\audio_io\juce_AudioIODeviceType.h">
       <Filter>Juce Modules\juce_audio_devices\audio_io</Filter>
     </ClInclude>
+    <ClInclude Include="..\..\..\..\modules\juce_audio_devices\audio_io\juce_SystemAudioVolume.h">
+      <Filter>Juce Modules\juce_audio_devices\audio_io</Filter>
+    </ClInclude>
     <ClInclude Include="..\..\..\..\modules\juce_audio_devices\midi_io\juce_MidiInput.h">
       <Filter>Juce Modules\juce_audio_devices\midi_io</Filter>
     </ClInclude>

modules/juce_audio_devices/audio_io/juce_SystemAudioVolume.h

@@ -0,0 +1,60 @@
+/*
+  ==============================================================================
+
+   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:
+    JUCE_DECLARE_NON_COPYABLE (SystemAudioVolume)
+};
+
+
+#endif   // __JUCE_SYSTEMAUDIOVOLUME_JUCEHEADER__

modules/juce_audio_devices/juce_audio_devices.cpp

@@ -46,6 +46,7 @@
  #import <CoreAudio/AudioHardware.h>
  #import <CoreMIDI/MIDIServices.h>
  #import <DiscRecording/DiscRecording.h>
+ #import <AudioToolbox/AudioServices.h>
  #undef Point
  #undef Component
 
@@ -233,4 +234,11 @@ namespace juce
 
 #endif
 
+#if ! JUCE_SYSTEMAUDIOVOL_IMPLEMENTED
+ // None of these methods are available. (On Windows you might need to enable WASAPI for this)
+ float JUCE_CALLTYPE SystemAudioVolume::getGain()              { jassertfalse; return 0.0f; }
+ bool  JUCE_CALLTYPE SystemAudioVolume::setGain (float gain)   { jassertfalse; return false; }
+ bool  JUCE_CALLTYPE SystemAudioVolume::isMuted()              { jassertfalse; return false; }
+ bool  JUCE_CALLTYPE SystemAudioVolume::setMuted (bool mute)   { jassertfalse; return false; }
+#endif
 }

modules/juce_audio_devices/juce_audio_devices.h

@@ -111,6 +111,9 @@ namespace juce
 #ifndef __JUCE_AUDIOIODEVICETYPE_JUCEHEADER__
  #include "audio_io/juce_AudioIODeviceType.h"
 #endif
+#ifndef __JUCE_SYSTEMAUDIOVOLUME_JUCEHEADER__
+ #include "audio_io/juce_SystemAudioVolume.h"
+#endif
 #ifndef __JUCE_MIDIINPUT_JUCEHEADER__
  #include "midi_io/juce_MidiInput.h"
 #endif

modules/juce_audio_devices/native/juce_mac_CoreAudio.cpp

@@ -29,6 +29,108 @@
  #define JUCE_COREAUDIOLOG(a)
 #endif
 
+//==============================================================================
+struct SystemVol
+{
+    SystemVol (AudioObjectPropertySelector selector)
+        : outputDeviceID (kAudioObjectUnknown)
+    {
+        addr.mScope    = kAudioObjectPropertyScopeGlobal;
+        addr.mElement  = kAudioObjectPropertyElementMaster;
+        addr.mSelector = kAudioHardwarePropertyDefaultOutputDevice;
+
+        if (AudioHardwareServiceHasProperty (kAudioObjectSystemObject, &addr))
+        {
+            UInt32 deviceIDSize = sizeof (outputDeviceID);
+            OSStatus status = AudioHardwareServiceGetPropertyData (kAudioObjectSystemObject, &addr, 0,
+                                                                   nullptr, &deviceIDSize, &outputDeviceID);
+
+            if (status == noErr)
+            {
+                addr.mElement  = kAudioObjectPropertyElementMaster;
+                addr.mSelector = selector;
+                addr.mScope    = kAudioDevicePropertyScopeOutput;
+
+                if (! AudioHardwareServiceHasProperty (outputDeviceID, &addr))
+                    outputDeviceID = kAudioObjectUnknown;
+            }
+        }
+    }
+
+    float getGain()
+    {
+        Float32 gain = 0;
+
+        if (outputDeviceID != kAudioObjectUnknown)
+        {
+            UInt32 size = sizeof (gain);
+            AudioHardwareServiceGetPropertyData (outputDeviceID, &addr,
+                                                 0, nullptr, &size, &gain);
+        }
+
+        return (float) gain;
+    }
+
+    bool setGain (float gain)
+    {
+        if (outputDeviceID != kAudioObjectUnknown && canSetVolume())
+        {
+            Float32 newVolume = gain;
+            UInt32 size = sizeof (newVolume);
+
+            return AudioHardwareServiceSetPropertyData (outputDeviceID, &addr, 0, nullptr,
+                                                        size, &newVolume) == noErr;
+        }
+
+        return false;
+    }
+
+    bool isMuted()
+    {
+        UInt32 muted = 0;
+
+        if (outputDeviceID != kAudioObjectUnknown)
+        {
+            UInt32 size = sizeof (muted);
+            AudioHardwareServiceGetPropertyData (outputDeviceID, &addr,
+                                                 0, nullptr, &size, &muted);
+        }
+
+        return muted != 0;
+    }
+
+    bool setMuted (bool mute)
+    {
+        if (outputDeviceID != kAudioObjectUnknown && canSetVolume())
+        {
+            UInt32 newMute = mute ? 1 : 0;
+            UInt32 size = sizeof (newMute);
+
+            return AudioHardwareServiceSetPropertyData (outputDeviceID, &addr, 0, nullptr,
+                                                        size, &newMute) == noErr;
+        }
+
+        return false;
+    }
+
+private:
+    AudioDeviceID outputDeviceID;
+    AudioObjectPropertyAddress addr;
+
+    bool canSetVolume()
+    {
+        Boolean isSettable = NO;
+        return AudioHardwareServiceIsPropertySettable (outputDeviceID, &addr, &isSettable) == noErr
+                 && isSettable;
+    }
+};
+
+#define JUCE_SYSTEMAUDIOVOL_IMPLEMENTED 1
+float JUCE_CALLTYPE SystemAudioVolume::getGain()              { return SystemVol (kAudioHardwareServiceDeviceProperty_VirtualMasterVolume).getGain(); }
+bool  JUCE_CALLTYPE SystemAudioVolume::setGain (float gain)   { return SystemVol (kAudioHardwareServiceDeviceProperty_VirtualMasterVolume).setGain (gain); }
+bool  JUCE_CALLTYPE SystemAudioVolume::isMuted()              { return SystemVol (kAudioDevicePropertyMute).isMuted(); }
+bool  JUCE_CALLTYPE SystemAudioVolume::setMuted (bool mute)   { return SystemVol (kAudioDevicePropertyMute).setMuted (mute); }
+
 //==============================================================================
 class CoreAudioInternal  : private Timer
 {

modules/juce_audio_devices/native/juce_win32_WASAPI.cpp

@@ -147,6 +147,28 @@ namespace
     };
 
     struct __declspec (uuid ("BCDE0395-E52F-467C-8E3D-C4579291692E")) MMDeviceEnumerator;
+
+    struct __declspec (uuid ("5CDF2C82-841E-4546-9722-0CF74078229A")) IAudioEndpointVolume : public IUnknown
+    {
+        virtual HRESULT STDMETHODCALLTYPE RegisterControlChangeNotify (void*) = 0;
+        virtual HRESULT STDMETHODCALLTYPE UnregisterControlChangeNotify (void*) = 0;
+        virtual HRESULT STDMETHODCALLTYPE GetChannelCount (UINT*) = 0;
+        virtual HRESULT STDMETHODCALLTYPE SetMasterVolumeLevel (float, LPCGUID) = 0;
+        virtual HRESULT STDMETHODCALLTYPE SetMasterVolumeLevelScalar (float, LPCGUID) = 0;
+        virtual HRESULT STDMETHODCALLTYPE GetMasterVolumeLevel (float*) = 0;
+        virtual HRESULT STDMETHODCALLTYPE GetMasterVolumeLevelScalar (float*) = 0;
+        virtual HRESULT STDMETHODCALLTYPE SetChannelVolumeLevel (UINT, float, LPCGUID) = 0;
+        virtual HRESULT STDMETHODCALLTYPE SetChannelVolumeLevelScalar (UINT, float, LPCGUID) = 0;
+        virtual HRESULT STDMETHODCALLTYPE GetChannelVolumeLevel (UINT, float*) = 0;
+        virtual HRESULT STDMETHODCALLTYPE GetChannelVolumeLevelScalar (UINT, float*) = 0;
+        virtual HRESULT STDMETHODCALLTYPE SetMute (BOOL, LPCGUID) = 0;
+        virtual HRESULT STDMETHODCALLTYPE GetMute (BOOL*) = 0;
+        virtual HRESULT STDMETHODCALLTYPE GetVolumeStepInfo (UINT*, UINT*) = 0;
+        virtual HRESULT STDMETHODCALLTYPE VolumeStepUp (LPCGUID) = 0;
+        virtual HRESULT STDMETHODCALLTYPE VolumeStepDown (LPCGUID) = 0;
+        virtual HRESULT STDMETHODCALLTYPE QueryHardwareSupport (DWORD*) = 0;
+        virtual HRESULT STDMETHODCALLTYPE GetVolumeRange (float*, float*, float*) = 0;
+    };
 }
 
 String getDeviceID (IMMDevice* const device)
@@ -1294,6 +1316,54 @@ private:
     JUCE_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR (WASAPIAudioIODeviceType)
 };
 
+//==============================================================================
+struct MMDeviceMasterVolume
+{
+    MMDeviceMasterVolume()
+    {
+        ComSmartPtr<IMMDeviceEnumerator> enumerator;
+        if (check (enumerator.CoCreateInstance (__uuidof (MMDeviceEnumerator))))
+        {
+            ComSmartPtr<IMMDevice> device;
+            if (check (enumerator->GetDefaultAudioEndpoint (eRender, eConsole, device.resetAndGetPointerAddress())))
+                check (device->Activate (__uuidof (IAudioEndpointVolume), CLSCTX_INPROC_SERVER, nullptr,
+                                         (void**) endpointVolume.resetAndGetPointerAddress()));
+        }
+    }
+
+    float getGain() const
+    {
+        float vol = 0.0f;
+        if (endpointVolume != nullptr)
+            check (endpointVolume->GetMasterVolumeLevelScalar (&vol));
+
+        return vol;
+    }
+
+    bool setGain (float newGain) const
+    {
+        return endpointVolume != nullptr
+                && check (endpointVolume->SetMasterVolumeLevelScalar (jlimit (0.0f, 1.0f, newGain), nullptr));
+    }
+
+    bool isMuted() const
+    {
+        BOOL mute = 0;
+        return endpointVolume != nullptr
+                 && check (endpointVolume->GetMute (&mute)) && mute != 0;
+    }
+
+    bool setMuted (bool shouldMute) const
+    {
+        return endpointVolume != nullptr
+                && check (endpointVolume->SetMute (shouldMute, nullptr));
+    }
+
+    ComSmartPtr<IAudioEndpointVolume> endpointVolume;
+
+    JUCE_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR (MMDeviceMasterVolume)
+};
+
 }
 
 //==============================================================================
@@ -1304,3 +1374,10 @@ AudioIODeviceType* AudioIODeviceType::createAudioIODeviceType_WASAPI()
 
     return nullptr;
 }
+
+//==============================================================================
+#define JUCE_SYSTEMAUDIOVOL_IMPLEMENTED 1
+float JUCE_CALLTYPE SystemAudioVolume::getGain()              { return WasapiClasses::MMDeviceMasterVolume().getGain(); }
+bool  JUCE_CALLTYPE SystemAudioVolume::setGain (float gain)   { return WasapiClasses::MMDeviceMasterVolume().setGain (gain); }
+bool  JUCE_CALLTYPE SystemAudioVolume::isMuted()              { return WasapiClasses::MMDeviceMasterVolume().isMuted(); }
+bool  JUCE_CALLTYPE SystemAudioVolume::setMuted (bool mute)   { return WasapiClasses::MMDeviceMasterVolume().setMuted (mute); }