Initial commit

app/VCAudioDeviceManager.h

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+// This file is part of Background Music.
+//
+// Background Music is free software: you can redistribute it and/or
+// modify it under the terms of the GNU General Public License as
+// published by the Free Software Foundation, either version 2 of the
+// License, or (at your option) any later version.
+
+#if defined(__cplusplus)
+
+// Local Includes
+#import "VCVirtualDevice.h"
+
+// PublicUtility Includes
+#import "CAHALAudioDevice.h"
+
+#endif /* defined(__cplusplus) */
+
+// System Includes
+#import <Foundation/Foundation.h>
+#import <CoreAudio/AudioHardwareBase.h>
+
+
+#pragma clang assume_nonnull begin
+
+@interface VCAudioDeviceManager : NSObject
+
+// Called on any volume change (scroll, keyboard, system slider).
+@property (nonatomic, copy) void (^onVolumeChanged)(void);
+
+// Returns nil if the virtual device driver isn't installed.
+- (instancetype) init;
+
+- (NSError* __nullable) setVCDeviceAsOSDefault;
+- (NSError* __nullable) unsetVCDeviceAsOSDefault;
+
+#ifdef __cplusplus
+- (VCVirtualDevice) vcDevice;
+- (CAHALAudioDevice) outputDevice;
+#endif
+
+- (BOOL) isVirtualDeviceActive;
+
+// Scans connected devices. If any lack hardware volume, activates the virtual device and starts
+// playthrough. Otherwise bypasses. Called at launch and on device hotplug.
+- (void) evaluateAndActivate;
+
+// Universal volume control — works on both virtual device and native hardware.
+- (float) volume;
+- (void) setVolume:(float)vol;
+- (BOOL) isMuted;
+- (void) setMuted:(BOOL)muted;
+
+@end
+
+#pragma clang assume_nonnull end