first pass of tts and audio stuff

pi/roverd/tts.go

@@ -0,0 +1,75 @@
+package roverd
+
+import (
+	"context"
+	"fmt"
+	"os/exec"
+	"strings"
+	"time"
+)
+
+func (c *WSClient) handleTTSPayload(payload *ttsPayload) error {
+	if payload == nil {
+		return fmt.Errorf("tts payload required")
+	}
+	if !c.cfg.Audio.TTSEnabled {
+		return fmt.Errorf("tts disabled on rover")
+	}
+	if payload.Speak == false {
+		return nil
+	}
+	text := strings.TrimSpace(payload.Text)
+	if text == "" {
+		return fmt.Errorf("tts text required")
+	}
+	if len([]rune(text)) > 512 {
+		text = string([]rune(text)[:512])
+	}
+
+	engine := strings.ToLower(strings.TrimSpace(payload.Engine))
+	if engine == "" {
+		engine = strings.ToLower(strings.TrimSpace(c.cfg.Audio.DefaultEngine))
+	}
+	if engine == "" {
+		engine = "flite"
+	}
+
+	voice := strings.TrimSpace(payload.Voice)
+	if voice == "" {
+		voice = strings.TrimSpace(c.cfg.Audio.DefaultVoice)
+	}
+	pitch := payload.Pitch
+	if pitch <= 0 {
+		pitch = c.cfg.Audio.DefaultPitch
+	}
+	pitch = clampInt(pitch, 0, 99)
+
+	ctx, cancel := context.WithTimeout(context.Background(), 12*time.Second)
+	defer cancel()
+
+	var cmd *exec.Cmd
+	switch engine {
+	case "espeak", "e":
+		args := []string{}
+		if pitch > 0 {
+			args = append(args, "-p", fmt.Sprintf("%d", pitch))
+		}
+		args = append(args, text)
+		cmd = exec.CommandContext(ctx, "espeak", args...)
+	case "flite", "f":
+		args := []string{}
+		if voice != "" {
+			args = append(args, "-voice", voice)
+		}
+		args = append(args, "-t", text)
+		cmd = exec.CommandContext(ctx, "flite", args...)
+	default:
+		return fmt.Errorf("unsupported tts engine: %s", engine)
+	}
+
+	out, err := cmd.CombinedOutput()
+	if err != nil {
+		return fmt.Errorf("tts exec failed: %w (%s)", err, string(out))
+	}
+	return nil
+}