feat: cw decoder

app_cw.go

@@ -0,0 +1,82 @@
+package main
+
+import (
+	"fmt"
+
+	"hamlog/internal/applog"
+	"hamlog/internal/audio"
+	"hamlog/internal/cwdecode"
+
+	wruntime "github.com/wailsapp/wails/v2/pkg/runtime"
+)
+
+// CW decoder: taps the RX audio device (the same "From radio" capture the DVK
+// and QSO recorder use) and streams decoded Morse text to the UI. It is started
+// only by the frontend, and only while the entry mode is CW.
+
+// StartCWDecoder begins decoding CW from the configured RX audio device. The
+// frontend calls this when the decoder toggle is on AND the mode is CW. Safe to
+// call repeatedly; a second call is a no-op while already running.
+func (a *App) StartCWDecoder() error {
+	a.cwMu.Lock()
+	defer a.cwMu.Unlock()
+	if a.cwStop != nil {
+		return nil // already running
+	}
+	dev := ""
+	if a.settings != nil {
+		dev, _ = a.settings.Get(a.ctx, keyAudioFromRadio)
+	}
+	if dev == "" {
+		return fmt.Errorf("no RX audio device configured (set \"From radio\" in Audio settings)")
+	}
+
+	dec := cwdecode.New(audio.SampleRate,
+		func(text string) {
+			if a.ctx != nil {
+				wruntime.EventsEmit(a.ctx, "cw:text", text)
+			}
+		},
+		func(st cwdecode.Status) {
+			if a.ctx != nil {
+				wruntime.EventsEmit(a.ctx, "cw:status", st)
+			}
+		},
+	)
+
+	stop := make(chan struct{})
+	a.cwStop = stop
+	go func() {
+		if err := audio.StreamCapture(dev, stop, dec.Process); err != nil {
+			applog.Printf("cw: capture failed: %v", err)
+			if a.ctx != nil {
+				wruntime.EventsEmit(a.ctx, "cw:error", err.Error())
+			}
+		}
+		// Capture ended (stopped or errored) — clear state so a restart works.
+		a.cwMu.Lock()
+		if a.cwStop == stop {
+			a.cwStop = nil
+		}
+		a.cwMu.Unlock()
+	}()
+	return nil
+}
+
+// StopCWDecoder halts the CW decoder if running.
+func (a *App) StopCWDecoder() {
+	a.cwMu.Lock()
+	stop := a.cwStop
+	a.cwStop = nil
+	a.cwMu.Unlock()
+	if stop != nil {
+		close(stop)
+	}
+}
+
+// CWDecoderRunning reports whether the decoder is currently capturing.
+func (a *App) CWDecoderRunning() bool {
+	a.cwMu.Lock()
+	defer a.cwMu.Unlock()
+	return a.cwStop != nil
+}