feat: added full support in USB (local) & ethernet (local or remote) of audio for Icom

internal/audio/manager.go

@@ -15,7 +15,10 @@ type Manager struct {
 	recStop  chan struct{}
 	recDone  chan recResult
 	playStop chan struct{}
-	onChange func() // fired on any record/playback state transition
+	monStop  chan struct{} // RX monitor passthrough (capture → render)
+	monRing  *pcmRing      // live audio hand-off, also fed by the network stream
+	txStop   chan struct{} // TX audio passthrough (mic → rig)
+	onChange func()        // fired on any record/playback state transition
 }
 
 type recResult struct {
@@ -135,3 +138,130 @@ func (m *Manager) StopPlayback() {
 		m.notify()
 	}
 }
+
+// ---- RX audio monitor (Phase 2: USB codec passthrough) --------------------
+//
+// StartMonitor pipes live RX audio from inputDev (e.g. the rig's "USB Audio
+// CODEC" capture endpoint) to outputDev (your speakers/headset) through a
+// latency-bounded ring, so you HEAR the radio inside OpsLog. The very same ring
+// is later fed by the network 50003 stream instead of a USB capture — the render
+// half is transport-agnostic. inputDev "" = system default capture.
+func (m *Manager) StartMonitor(inputDev, outputDev string) error {
+	return m.startMonitor(inputDev, outputDev, true)
+}
+
+// StartMonitorSink starts ONLY the render side (no USB capture) so an external
+// producer — the network 50003 stream — can feed decoded RX PCM via
+// PushMonitorAudio. Same output path as StartMonitor, minus the capture goroutine.
+func (m *Manager) StartMonitorSink(outputDev string) error {
+	return m.startMonitor("", outputDev, false)
+}
+
+// startMonitor wires the RX monitor: always a render loop pulling from monRing;
+// when capture is true it also captures inputDev into that ring (USB monitor).
+// When false the ring is fed only by PushMonitorAudio (network audio).
+func (m *Manager) startMonitor(inputDev, outputDev string, capture bool) error {
+	m.mu.Lock()
+	if m.monStop != nil {
+		m.mu.Unlock()
+		return fmt.Errorf("monitor already running")
+	}
+	stop := make(chan struct{})
+	ring := newPCMRing(bytesPerSec / 2) // ~500 ms cap — low latency for live monitor
+	m.monStop, m.monRing = stop, ring
+	m.mu.Unlock()
+
+	if capture {
+		// Producer: capture the rig's USB audio into the ring.
+		go func() {
+			_ = captureStream(inputDev, stop, func(chunk []byte) { ring.Push(chunk) })
+		}()
+	}
+	// Consumer: render the ring to the output device at the internal 16 kHz mono.
+	go func() {
+		_ = renderStream(outputDev, sampleRate, channels, bitsPerSample, stop, ring)
+	}()
+	m.notify()
+	return nil
+}
+
+// StopMonitor stops the RX monitor passthrough.
+func (m *Manager) StopMonitor() {
+	m.mu.Lock()
+	stop := m.monStop
+	m.monStop, m.monRing = nil, nil
+	m.mu.Unlock()
+	if stop != nil {
+		close(stop)
+		m.notify()
+	}
+}
+
+// MonitorActive reports whether the RX monitor passthrough is running.
+func (m *Manager) MonitorActive() bool {
+	m.mu.Lock()
+	defer m.mu.Unlock()
+	return m.monStop != nil
+}
+
+// PushMonitorAudio feeds externally-sourced PCM (16 kHz mono 16-bit) into the
+// active monitor's output — the hook the network 50003 audio stream uses to play
+// decoded RX through the very same output path a USB capture feeds. No-op when no
+// monitor is running. Keeps the unexported ring inside the package.
+func (m *Manager) PushMonitorAudio(pcm []byte) {
+	m.mu.Lock()
+	ring := m.monRing
+	m.mu.Unlock()
+	if ring != nil {
+		ring.Push(pcm)
+	}
+}
+
+// ---- TX audio passthrough (Phase 3: live mic → rig over USB) --------------
+//
+// StartTXAudio pipes your live microphone (micDev) into the rig's audio input
+// (toRadioDev — for a USB-connected rig, its "USB Audio CODEC" render endpoint),
+// so you talk through the PC. It is the mirror of StartMonitor (same ring +
+// capture + render primitives, source/sink swapped). PTT keying is the caller's
+// job (the app layer keys PTT before this and unkeys after) so this stays a pure
+// audio route. The captured 16 kHz mono stream is also the exact shape the future
+// network 50003 TX will encode and send — so Phase 5 reuses this capture side.
+func (m *Manager) StartTXAudio(micDev, toRadioDev string) error {
+	m.mu.Lock()
+	if m.txStop != nil {
+		m.mu.Unlock()
+		return fmt.Errorf("TX audio already running")
+	}
+	stop := make(chan struct{})
+	ring := newPCMRing(bytesPerSec / 4) // ~250 ms — tighter for live TX latency
+	m.txStop = stop
+	m.mu.Unlock()
+
+	go func() {
+		_ = captureStream(micDev, stop, func(chunk []byte) { ring.Push(chunk) })
+	}()
+	go func() {
+		_ = renderStream(toRadioDev, sampleRate, channels, bitsPerSample, stop, ring)
+	}()
+	m.notify()
+	return nil
+}
+
+// StopTXAudio stops the TX mic→rig passthrough.
+func (m *Manager) StopTXAudio() {
+	m.mu.Lock()
+	stop := m.txStop
+	m.txStop = nil
+	m.mu.Unlock()
+	if stop != nil {
+		close(stop)
+		m.notify()
+	}
+}
+
+// TXAudioActive reports whether the TX mic→rig passthrough is running.
+func (m *Manager) TXAudioActive() bool {
+	m.mu.Lock()
+	defer m.mu.Unlock()
+	return m.txStop != nil
+}