Auto convert ONNX models to RKNN format (#19674)

* Implement base rknn conversion

* Remove unused

* Formatting

* Add model conversion lock so it doesn't break when multiple detectors are defined

* Ignore unused impor
t

frigate/detectors/plugins/rknn.py

@@ -12,6 +12,7 @@ from frigate.const import MODEL_CACHE_DIR
 from frigate.detectors.detection_api import DetectionApi
 from frigate.detectors.detector_config import BaseDetectorConfig, ModelTypeEnum
 from frigate.util.model import post_process_yolo
+from frigate.util.rknn_converter import auto_convert_model
 
 logger = logging.getLogger(__name__)
 
@@ -94,7 +95,31 @@ class Rknn(DetectionApi):
         # user provided models should be a path and contain a "/"
         if "/" in model_path:
             model_props["preset"] = False
-            model_props["path"] = model_path
+
+            # Check if this is an ONNX model or model without extension that needs conversion
+            if model_path.endswith(".onnx") or not os.path.splitext(model_path)[1]:
+                # Try to auto-convert to RKNN format
+                logger.info(
+                    f"Attempting to auto-convert {model_path} to RKNN format..."
+                )
+
+                # Determine model type from config
+                model_type = self.detector_config.model.model_type
+
+                # Auto-convert the model
+                converted_path = auto_convert_model(model_path, model_type.value)
+
+                if converted_path:
+                    model_props["path"] = converted_path
+                    logger.info(f"Successfully converted model to: {converted_path}")
+                else:
+                    # Fall back to original path if conversion fails
+                    logger.warning(
+                        f"Failed to convert {model_path} to RKNN format, using original path"
+                    )
+                    model_props["path"] = model_path
+            else:
+                model_props["path"] = model_path
         else:
             model_props["preset"] = True