Fixing an issue where some devices (usb) don't support channel 0, so i switched to virtual main volume

src/Makefile

@@ -4,7 +4,7 @@ INSTALLDIR = ~/Library/Application\ Support/com.elgato.StreamDeck/Plugins/com.dl
 #SDPLUGINDIR = "./com.dlprows.macvolumecontrol.sdPlugin"
 
 update:
-	killall Stream\ Deck.app || true
+	killall Stream\ Deck || true
 	go build -o $(INSTALLDIR) .
 	open -a Elgato\ Stream\ Deck
 

src/volume/coreAudio.go

@@ -2,8 +2,9 @@ package volume
 
 /*
  #cgo CFLAGS: -x objective-c
- #cgo LDFLAGS: -framework CoreAudio
+ #cgo LDFLAGS: -framework CoreAudio -framework AudioToolbox
  #include <CoreAudio/CoreAudio.h>
+ #include <AudioToolbox/AudioToolbox.h>
 */
 import "C"
 import (
@@ -43,10 +44,17 @@ func GetDefaultOutputDevice() (AudioObjectID, OSStatus) {
 func GetVolume(objectID AudioObjectID) (float32, OSStatus) {
 
 	properties := C.AudioObjectPropertyAddress{
-		C.kAudioDevicePropertyVolumeScalar,
+		C.kAudioHardwareServiceDeviceProperty_VirtualMainVolume,
 		C.kAudioDevicePropertyScopeOutput,
-		0, //main channel
+		C.kAudioObjectPropertyElementMain,
 	}
+	/*
+		properties := C.AudioObjectPropertyAddress{
+			C.kAudioDevicePropertyVolumeScalar,
+			C.kAudioDevicePropertyScopeOutput,
+			0, //main channel
+		}
+	*/
 
 	var data C.Float32
 	dataSize := C.UInt32(unsafe.Sizeof(data))
@@ -66,10 +74,17 @@ func GetVolume(objectID AudioObjectID) (float32, OSStatus) {
 func SetVolume(objectID AudioObjectID, volume float32) OSStatus {
 
 	properties := C.AudioObjectPropertyAddress{
-		C.kAudioDevicePropertyVolumeScalar,
+		C.kAudioHardwareServiceDeviceProperty_VirtualMainVolume,
 		C.kAudioDevicePropertyScopeOutput,
-		0, //main channel
+		C.kAudioObjectPropertyElementMain,
 	}
+	/*
+		properties := C.AudioObjectPropertyAddress{
+			C.kAudioDevicePropertyVolumeScalar,
+			C.kAudioDevicePropertyScopeOutput,
+			0, //main channel
+		}
+	*/
 
 	data := C.Float32(volume)