Support using GenAI for audio transcription (#24396)

* Add support for running transcription with GenAI

* Improve audio joining

* Fix GenAI model capability reporting

* Support language correctly

* Migrate existing users to keep english selected

* Fix models

* Fix tests

* Fix accepted null model

* Handle slwo providers

frigate/events/audio.py

@@ -19,6 +19,7 @@ from frigate.config.camera.updater import (
     CameraConfigUpdateEnum,
     CameraConfigUpdateSubscriber,
 )
+from frigate.config.classification import AudioTranscriptionModelEnum
 from frigate.const import (
     AUDIO_DURATION,
     AUDIO_FORMAT,
@@ -112,18 +113,31 @@ class AudioProcessor(FrigateProcess):
 
         threading.current_thread().name = "process:audio_manager"
 
+        self.transcription_model_runner: AudioTranscriptionModelRunner | None = None
+        self.genai_manager: Any = None
+
         if any(
             c.enabled_in_config and c.audio_transcription.enabled
             for c in self.config.cameras.values()
         ):
-            self.transcription_model_runner: AudioTranscriptionModelRunner | None = (
-                AudioTranscriptionModelRunner(
+            if isinstance(
+                self.config.audio_transcription.model, AudioTranscriptionModelEnum
+            ):
+                # AudioTranscriptionModelRunner.__init__ unconditionally fetches
+                # sherpa-onnx or whisper weights, so only build it on the local path
+                self.transcription_model_runner = AudioTranscriptionModelRunner(
                     self.config.audio_transcription.device or "AUTO",
                     self.config.audio_transcription.model_size,
                 )
-            )
-        else:
-            self.transcription_model_runner = None
+            else:
+                # imported here rather than at module scope: frigate.genai pulls in
+                # numpy, the provider SDKs, frigate.models, and the prompt builders,
+                # and this process runs at PROCESS_PRIORITY_HIGH. built after the
+                # fork because SDK clients hold sockets and TLS state that must not
+                # cross it; clients themselves stay lazy behind the role property.
+                from frigate.genai.manager import GenAIClientManager
+
+                self.genai_manager = GenAIClientManager(self.config)
 
         config_subscriber = CameraConfigUpdateSubscriber(
             self.config,
@@ -151,6 +165,7 @@ class AudioProcessor(FrigateProcess):
                 self.camera_metrics,
                 self.transcription_model_runner,
                 self.stop_event,  # type: ignore[arg-type]
+                self.genai_manager,
             )
             self.audio_threads[name] = thread
             thread.start()
@@ -200,6 +215,7 @@ class AudioEventMaintainer(threading.Thread):
         camera_metrics: DictProxy,
         audio_transcription_model_runner: AudioTranscriptionModelRunner | None,
         stop_event: threading.Event,
+        genai_manager: Any = None,
     ) -> None:
         super().__init__(name=f"{camera.name}_audio_event_processor")
 
@@ -222,6 +238,7 @@ class AudioEventMaintainer(threading.Thread):
         self.logpipe = LogPipe(f"ffmpeg.{self.camera_config.name}.audio")
         self.audio_listener: subprocess.Popen[Any] | None = None
         self.audio_transcription_model_runner = audio_transcription_model_runner
+        self.genai_manager = genai_manager
         self.transcription_processor = None
         self.transcription_thread = None
 
@@ -238,9 +255,9 @@ class AudioEventMaintainer(threading.Thread):
         )
         self.detection_publisher = DetectionPublisher(DetectionTypeEnum.audio.value)
 
-        if (
-            self.camera_config.audio_transcription.enabled
-            and self.audio_transcription_model_runner is not None
+        if self.camera_config.audio_transcription.enabled and (
+            self.audio_transcription_model_runner is not None
+            or self.genai_manager is not None
         ):
             # init the transcription processor for this camera
             self.transcription_processor = AudioTranscriptionRealTimeProcessor(
@@ -250,6 +267,7 @@ class AudioEventMaintainer(threading.Thread):
                 model_runner=self.audio_transcription_model_runner,
                 metrics=self.camera_metrics[self.camera_config.name],
                 stop_event=self.stop_event,
+                genai_manager=self.genai_manager,
             )
 
             self.transcription_thread = threading.Thread(