fixed bug: gain should now correctly affect whisper models as intended

murmur.py

@@ -737,10 +737,69 @@ class DeviceAPI:
             self.recorder.stop_and_save()
             return False  # now "not recording"
 
+    def _find_matching_input_for_output(self) -> Optional[int]:
+        """
+        Versucht, für das aktuell gewählte Output-Device (self.output_index)
+        ein gleichnamiges Input-Device zu finden (typisch bei Loopback-Treibern).
+        Gibt den Input-Device-Index zurück oder None.
+        """
+        try:
+            if self.output_index is None or self.output_index < 0:
+                return None
+            devs = sd.query_devices()
+            out_name = devs[self.output_index]["name"]
+
+            # 1) exakter Name
+            for i, d in enumerate(devs):
+                if d.get("max_input_channels", 0) > 0 and d["name"] == out_name:
+                    return i
+
+            low = out_name.lower()
+
+            # 2) case-insensitive exakter Name
+            for i, d in enumerate(devs):
+                if d.get("max_input_channels", 0) > 0 and d["name"].lower() == low:
+                    return i
+
+            # 3) Prefix-Match (robuster für unterschiedliche Bezeichnungen)
+            for i, d in enumerate(devs):
+                if d.get("max_input_channels", 0) > 0 and d["name"].lower().startswith(low):
+                    return i
+
+            return None
+        except Exception:
+            return None
+
     def _start_stt(self):
+        """
+        Startet den STT-Client-Prozess.
+        Neu: bevorzugt den POST-GAIN Loopback als STT-Quelle, wenn ein passendes
+        Input-Device zum aktuell gewählten Output-Device existiert. Fallback: raw input.
+        """
+        # Standard: rohes Eingabegerät
+        capture_index = self.input_index
+
+        # Versuch: passendes Loopback-Input zu aktuellem Output finden
+        loop_idx = self._find_matching_input_for_output()
+        if loop_idx is not None:
+            capture_index = loop_idx
+            try:
+                devs = sd.query_devices()
+                print(f"[ASR] capturing POST-GAIN from loopback input #{loop_idx} ({devs[loop_idx]['name']})",
+                      file=sys.stderr)
+            except Exception:
+                print(f"[ASR] capturing POST-GAIN from loopback input #{loop_idx}", file=sys.stderr)
+        else:
+            try:
+                devs = sd.query_devices()
+                print(f"[ASR] capturing RAW from input #{self.input_index} ({devs[self.input_index]['name']})",
+                      file=sys.stderr)
+            except Exception:
+                print(f"[ASR] capturing RAW from input #{self.input_index}", file=sys.stderr)
+
         self.client_proc = Process(
             target=_stt_worker,
-            args=(self.input_index, self.queue, self.translate_enabled, self.src_lang_id),
+            args=(capture_index, self.queue, self.translate_enabled, self.src_lang_id),
             daemon=True
         )
         self.client_proc.start()