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add multicast flow transmitter discovery via mdns _netaudio-chan service

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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
This commit is contained in:
Ian Gulliver
2026-01-23 11:53:30 -08:00
parent 47b48337b3
commit 9c7bd671ba
4 changed files with 165 additions and 24 deletions
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98
dante_control.go
View File

@@ -26,9 +26,9 @@ type DanteFlow struct {
}
type DanteFlowSubscriber struct {
Name string
Channels []int
LastSeen time.Time
Name string
Channels []string
LastSeen time.Time
}
type DanteFlows struct {
@@ -42,7 +42,7 @@ func NewDanteFlows() *DanteFlows {
}
}
func (d *DanteFlows) Update(sourceName, subscriberName string, channel int) {
func (d *DanteFlows) Update(sourceName, subscriberName, channelInfo string) {
d.mu.Lock()
defer d.mu.Unlock()
@@ -63,17 +63,17 @@ func (d *DanteFlows) Update(sourceName, subscriberName string, channel int) {
flow.Subscribers[subscriberName] = sub
}
if channel > 0 {
if channelInfo != "" {
hasChannel := false
for _, ch := range sub.Channels {
if ch == channel {
if ch == channelInfo {
hasChannel = true
break
break
}
}
if !hasChannel {
sub.Channels = append(sub.Channels, channel)
sort.Ints(sub.Channels)
sub.Channels = append(sub.Channels, channelInfo)
sort.Strings(sub.Channels)
}
}
@@ -121,11 +121,7 @@ func (d *DanteFlows) LogAll() {
for _, sub := range flow.Subscribers {
name := sub.Name
if len(sub.Channels) > 0 {
var chStrs []string
for _, ch := range sub.Channels {
chStrs = append(chStrs, fmt.Sprintf("%d", ch))
}
name = fmt.Sprintf("%s[%s]", name, strings.Join(chStrs, ","))
name = fmt.Sprintf("%s[%s]", name, strings.Join(sub.Channels, ","))
}
subNames = append(subNames, name)
}
@@ -170,6 +166,10 @@ func (t *Tendrils) queryDanteDeviceWithPort(ip net.IP, port int) *DanteDeviceInf
info.Subscriptions, info.HasMulticast = t.queryDanteSubscriptions(conn, ip, info.RxChannelCount, info.TxChannelCount)
}
if info.TxChannelCount > 0 {
t.queryDanteTxChannels(conn, ip, info.TxChannelCount)
}
return info
}
@@ -278,6 +278,27 @@ func (t *Tendrils) queryDanteChannelCount(conn *net.UDPConn, ip net.IP) (int, in
return rxCount, txCount
}
func (t *Tendrils) queryDanteTxChannels(conn *net.UDPConn, ip net.IP, txCount int) {
if txCount == 0 {
return
}
pagesNeeded := (txCount + 15) / 16
for page := 0; page < pagesNeeded; page++ {
pageNum := byte(page + 1)
args := []byte{0x00, 0x01, 0x00, pageNum, 0x00, 0x00}
resp := t.sendDanteCommand(conn, ip, 0x2000, args)
if t.DebugDante {
if resp == nil {
log.Printf("[dante] %s: tx channels 0x2000 page %d: no response", ip, page)
} else {
log.Printf("[dante] %s: tx channels 0x2000 page %d (%d bytes): %x", ip, page, len(resp), resp)
}
}
}
}
func (t *Tendrils) queryDanteSubscriptions(conn *net.UDPConn, ip net.IP, rxCount, txCount int) ([]DanteSubscription, bool) {
if rxCount == 0 {
return nil, false
@@ -311,24 +332,38 @@ func (t *Tendrils) queryDanteSubscriptions(conn *net.UDPConn, ip net.IP, rxCount
hasMulticast = hasMulticast || isMulticast
if isMulticast {
if t.DebugDante {
stringTableStart := 12 + subCount*20
if stringTableStart < len(resp) {
log.Printf("[dante] %s: multicast string table at offset %d: %x", ip, stringTableStart, resp[stringTableStart:])
}
}
recordOffset := 12
for idx := 0; idx < subCount; idx++ {
if recordOffset+20 > len(resp) {
break
}
if t.DebugDante {
log.Printf("[dante] %s: multicast record %d at offset %d: %x", ip, idx, recordOffset, resp[recordOffset:recordOffset+20])
}
rxChannelNum := int(binary.BigEndian.Uint16(resp[recordOffset : recordOffset+2]))
txDeviceOffset := int(binary.BigEndian.Uint16(resp[recordOffset+4 : recordOffset+6]))
txChannelOffset := int(binary.BigEndian.Uint16(resp[recordOffset+10 : recordOffset+12]))
txDeviceName := extractNullTerminatedString(resp, txDeviceOffset)
txChannelName := extractNullTerminatedString(resp, txChannelOffset)
if txDeviceName != "" {
subscriptions = append(subscriptions, DanteSubscription{
RxChannel: rxChannelNum,
TxDeviceName: txDeviceName,
})
if t.DebugDante {
log.Printf("[dante] %s: multicast record %d: rx=%d txDevOffset=%d txDev=%q txChOffset=%d txCh=%q", ip, idx, rxChannelNum, txDeviceOffset, txDeviceName, txChannelOffset, txChannelName)
}
subscriptions = append(subscriptions, DanteSubscription{
RxChannel: rxChannelNum,
TxDeviceName: txDeviceName,
TxChannelName: txChannelName,
})
recordOffset += 20
}
} else {
@@ -396,21 +431,38 @@ func (t *Tendrils) probeDanteDeviceWithPort(ip net.IP, port int) {
t.nodes.Update(nil, nil, []net.IP{ip}, "", info.Name, "dante-control")
}
var multicastChannels []string
for _, sub := range info.Subscriptions {
if t.DebugDante {
log.Printf("[dante] %s: subscription rx=%d -> %s@%s",
ip, sub.RxChannel, sub.TxChannelName, sub.TxDeviceName)
}
if sub.TxDeviceName != "" && info.Name != "" {
t.danteFlows.Update(sub.TxDeviceName, info.Name, sub.RxChannel)
channelInfo := ""
if sub.TxChannelName != "" {
channelInfo = fmt.Sprintf("%s->%d", sub.TxChannelName, sub.RxChannel)
}
t.danteFlows.Update(sub.TxDeviceName, info.Name, channelInfo)
} else if sub.TxChannelName != "" {
multicastChannels = append(multicastChannels, sub.TxChannelName)
}
}
if info.HasMulticast && info.Name != "" {
groups := t.nodes.GetDanteMulticastGroups(ip)
for _, groupIP := range groups {
groupName := (&MulticastGroup{IP: groupIP}).Name()
t.danteFlows.Update(groupName, info.Name, 0)
sourceName := t.nodes.GetDanteTxDeviceInGroup(groupIP)
if t.DebugDante {
log.Printf("[dante] %s: multicast group %s -> tx device %q", ip, groupIP, sourceName)
}
if sourceName == "" {
sourceName = (&MulticastGroup{IP: groupIP}).Name()
}
channelInfo := ""
if len(multicastChannels) > 0 {
channelInfo = strings.Join(multicastChannels, ",")
}
t.danteFlows.Update(sourceName, info.Name, channelInfo)
}
}
}