feat: added record qso dvk

internal/audio/devices.go

@@ -0,0 +1,103 @@
+//go:build windows
+
+// Package audio drives Windows audio endpoints via WASAPI (through go-ole /
+// go-wca) — pure Go, no CGO, the same COM stack OmniRig already uses. It
+// powers the Digital Voice Keyer (record/play voice messages to the rig) and
+// the QSO recorder (rolling-buffer capture saved as WAV).
+package audio
+
+import (
+	"fmt"
+	"runtime"
+	"sort"
+
+	"github.com/go-ole/go-ole"
+	"github.com/moutend/go-wca/pkg/wca"
+)
+
+// Device is one audio endpoint (a capture input or a render output).
+type Device struct {
+	ID      string `json:"id"`      // stable WASAPI endpoint id (persisted)
+	Name    string `json:"name"`    // friendly name shown in dropdowns
+	Default bool   `json:"default"` // is this the system default endpoint
+}
+
+// ListInputDevices returns the active capture endpoints — microphones,
+// line-in, and the soundcard input wired to the rig's audio out ("From Radio").
+func ListInputDevices() ([]Device, error) { return listEndpoints(wca.ECapture) }
+
+// ListOutputDevices returns the active render endpoints — speakers and the
+// soundcard output wired to the rig's mic/data input ("To Radio").
+func ListOutputDevices() ([]Device, error) { return listEndpoints(wca.ERender) }
+
+// listEndpoints enumerates active endpoints for a data-flow direction. COM is
+// thread-affine, so we lock the OS thread and Co(Un)Initialize around the work
+// — this is a one-shot call from a Wails binding, not a long-lived session.
+func listEndpoints(flow uint32) (out []Device, err error) {
+	runtime.LockOSThread()
+	defer runtime.UnlockOSThread()
+
+	if e := ole.CoInitializeEx(0, ole.COINIT_APARTMENTTHREADED); e != nil {
+		// 0x1 = S_FALSE → already initialised on this thread, fine.
+		if oe, ok := e.(*ole.OleError); !ok || oe.Code() != 0x00000001 {
+			return nil, fmt.Errorf("CoInitializeEx: %w", e)
+		}
+	}
+	defer ole.CoUninitialize()
+
+	var mmde *wca.IMMDeviceEnumerator
+	if e := wca.CoCreateInstance(wca.CLSID_MMDeviceEnumerator, 0, wca.CLSCTX_ALL,
+		wca.IID_IMMDeviceEnumerator, &mmde); e != nil {
+		return nil, fmt.Errorf("create MMDeviceEnumerator: %w", e)
+	}
+	defer mmde.Release()
+
+	// Record the default endpoint id so the UI can flag it.
+	var defID string
+	var defDev *wca.IMMDevice
+	if e := mmde.GetDefaultAudioEndpoint(flow, wca.EConsole, &defDev); e == nil && defDev != nil {
+		_ = defDev.GetId(&defID)
+		defDev.Release()
+	}
+
+	var coll *wca.IMMDeviceCollection
+	if e := mmde.EnumAudioEndpoints(flow, wca.DEVICE_STATE_ACTIVE, &coll); e != nil {
+		return nil, fmt.Errorf("enum endpoints: %w", e)
+	}
+	defer coll.Release()
+
+	var count uint32
+	if e := coll.GetCount(&count); e != nil {
+		return nil, fmt.Errorf("count endpoints: %w", e)
+	}
+	for i := uint32(0); i < count; i++ {
+		var dev *wca.IMMDevice
+		if coll.Item(i, &dev) != nil || dev == nil {
+			continue
+		}
+		var id string
+		_ = dev.GetId(&id)
+		name := endpointName(dev, id)
+		dev.Release()
+		out = append(out, Device{ID: id, Name: name, Default: id != "" && id == defID})
+	}
+	sort.SliceStable(out, func(i, j int) bool { return out[i].Name < out[j].Name })
+	return out, nil
+}
+
+// endpointName reads PKEY_Device_FriendlyName, falling back to the raw id.
+func endpointName(dev *wca.IMMDevice, fallback string) string {
+	var ps *wca.IPropertyStore
+	if dev.OpenPropertyStore(wca.STGM_READ, &ps) != nil || ps == nil {
+		return fallback
+	}
+	defer ps.Release()
+	var pv wca.PROPVARIANT
+	if ps.GetValue(&wca.PKEY_Device_FriendlyName, &pv) != nil {
+		return fallback
+	}
+	if s := pv.String(); s != "" {
+		return s
+	}
+	return fallback
+}