add headamp gain and phantom commands

internal/xair/address.go

@@ -1,13 +1,15 @@
 package xair
 
 var xairAddressMap = map[string]string{
-	"strip": "/ch/%02d",
-	"bus":   "/bus/%01d",
+	"strip":   "/ch/%02d",
+	"bus":     "/bus/%01d",
+	"headamp": "/headamp/%02d",
 }
 
 var x32AddressMap = map[string]string{
-	"strip": "/ch/%02d",
-	"bus":   "/bus/%02d",
+	"strip":   "/ch/%02d",
+	"bus":     "/bus/%02d",
+	"headamp": "/headamp/%02d",
 }
 
 func addressMapForMixerKind(kind MixerKind) map[string]string {

internal/xair/client.go

@@ -15,9 +15,10 @@ type parser interface {
 
 type Client struct {
 	engine
-	Main  *Main
-	Strip *Strip
-	Bus   *Bus
+	Main    *Main
+	Strip   *Strip
+	Bus     *Bus
+	HeadAmp *HeadAmp
 }
 
 // NewClient creates a new XAirClient instance
@@ -60,6 +61,7 @@ func NewClient(mixerIP string, mixerPort int, opts ...Option) (*Client, error) {
 	c.Main = newMain(*c)
 	c.Strip = NewStrip(*c)
 	c.Bus = NewBus(*c)
+	c.HeadAmp = NewHeadAmp(*c)
 
 	return c, nil
 }

internal/xair/headamp.go

@@ -0,0 +1,67 @@
+package xair
+
+import "fmt"
+
+type HeadAmp struct {
+	baseAddress string
+	client      Client
+}
+
+func NewHeadAmp(c Client) *HeadAmp {
+	return &HeadAmp{
+		baseAddress: c.addressMap["headamp"],
+		client:      c,
+	}
+}
+
+// Gain gets the gain level for the specified headamp index.
+func (h *HeadAmp) Gain(index int) (float64, error) {
+	address := fmt.Sprintf(h.baseAddress, index) + "/gain"
+	err := h.client.SendMessage(address)
+	if err != nil {
+		return 0, err
+	}
+
+	resp := <-h.client.respChan
+	val, ok := resp.Arguments[0].(float32)
+	if !ok {
+		return 0, fmt.Errorf("unexpected argument type for headamp gain value")
+	}
+
+	return linGet(-12, 60, float64(val)), nil
+}
+
+// SetGain sets the gain level for the specified headamp index.
+func (h *HeadAmp) SetGain(index int, level float64) error {
+	address := fmt.Sprintf(h.baseAddress, index) + "/gain"
+	return h.client.SendMessage(address, float32(linSet(-12, 60, level)))
+}
+
+// PhantomPower gets the phantom power status for the specified headamp index.
+func (h *HeadAmp) PhantomPower(index int) (bool, error) {
+	address := fmt.Sprintf(h.baseAddress, index) + "/phantom"
+	err := h.client.SendMessage(address)
+	if err != nil {
+		return false, err
+	}
+
+	resp := <-h.client.respChan
+	val, ok := resp.Arguments[0].(int32)
+	if !ok {
+		return false, fmt.Errorf("unexpected argument type for phantom power value")
+	}
+
+	return val != 0, nil
+}
+
+// SetPhantomPower sets the phantom power status for the specified headamp index.
+func (h *HeadAmp) SetPhantomPower(index int, enabled bool) error {
+	address := fmt.Sprintf(h.baseAddress, index) + "/phantom"
+	var val int32
+	if enabled {
+		val = 1
+	} else {
+		val = 0
+	}
+	return h.client.SendMessage(address, val)
+}

internal/xair/strip.go

@@ -15,8 +15,8 @@ func NewStrip(c Client) *Strip {
 }
 
 // Mute gets the mute status of the specified strip (1-based indexing).
-func (s *Strip) Mute(strip int) (bool, error) {
-	address := fmt.Sprintf(s.baseAddress, strip) + "/mix/on"
+func (s *Strip) Mute(index int) (bool, error) {
+	address := fmt.Sprintf(s.baseAddress, index) + "/mix/on"
 	err := s.client.SendMessage(address)
 	if err != nil {
 		return false, err
@@ -63,28 +63,6 @@ func (s *Strip) SetFader(strip int, level float64) error {
 	return s.client.SendMessage(address, float32(mustDbInto(level)))
 }
 
-// MicGain requests the phantom gain for a specific strip (1-based indexing).
-func (s *Strip) MicGain(strip int) (float64, error) {
-	address := fmt.Sprintf(s.baseAddress, strip) + "/mix/gain"
-	err := s.client.SendMessage(address)
-	if err != nil {
-		return 0, fmt.Errorf("failed to send strip gain request: %v", err)
-	}
-
-	resp := <-s.client.respChan
-	val, ok := resp.Arguments[0].(float32)
-	if !ok {
-		return 0, fmt.Errorf("unexpected argument type for strip gain value")
-	}
-	return mustDbFrom(float64(val)), nil
-}
-
-// SetMicGain sets the phantom gain for a specific strip (1-based indexing).
-func (s *Strip) SetMicGain(strip int, gain float32) error {
-	address := fmt.Sprintf(s.baseAddress, strip) + "/mix/gain"
-	return s.client.SendMessage(address, gain)
-}
-
 // Name requests the name for a specific strip
 func (s *Strip) Name(strip int) (string, error) {
 	address := fmt.Sprintf(s.baseAddress, strip) + "/config/name"
@@ -150,3 +128,25 @@ func (s *Strip) SetSendLevel(strip int, bus int, level float64) error {
 	address := fmt.Sprintf(s.baseAddress, strip) + fmt.Sprintf("/mix/%02d/level", bus)
 	return s.client.SendMessage(address, float32(mustDbInto(level)))
 }
+
+// MicGain requests the phantom gain for a specific strip (1-based indexing).
+func (s *Strip) MicGain(strip int) (float64, error) {
+	address := fmt.Sprintf(s.baseAddress, strip) + "/mix/gain"
+	err := s.client.SendMessage(address)
+	if err != nil {
+		return 0, fmt.Errorf("failed to send strip gain request: %v", err)
+	}
+
+	resp := <-s.client.respChan
+	val, ok := resp.Arguments[0].(float32)
+	if !ok {
+		return 0, fmt.Errorf("unexpected argument type for strip gain value")
+	}
+	return mustDbFrom(float64(val)), nil
+}
+
+// SetMicGain sets the phantom gain for a specific strip (1-based indexing).
+func (s *Strip) SetMicGain(strip int, gain float64) error {
+	address := fmt.Sprintf(s.baseAddress, strip) + "/mix/gain"
+	return s.client.SendMessage(address, float32(mustDbInto(gain)))
+}

internal/xair/util.go

@@ -2,6 +2,14 @@ package xair
 
 import "math"
 
+func linGet(min float64, max float64, value float64) float64 {
+	return min + (max-min)*value
+}
+
+func linSet(min float64, max float64, value float64) float64 {
+	return (value - min) / (max - min)
+}
+
 func mustDbInto(db float64) float64 {
 	switch {
 	case db >= 10: