Add AMD support via ort alternative to trt

src/nodes/face_detector_node.hpp

@@ -1,39 +1,30 @@
 #pragma once
-#include "scrfd_decoder.hpp"
-#include "trt_scrfd_decoder.hpp"
 #include "config.hpp"
-#include "ort_provider.hpp"
+#include "inference/face_detector.hpp"
 
+#include <algorithm>
 #include <memory>
 #include <string>
 
 // ── FaceDetectorFunc ──────────────────────────────────────────────────────────
 // KPN node: runs SCRFD-500MF to detect ALL faces in a frame.
 //
-// Backend selection:
-//   --detector-engine <path>  → TrtScrfdDecoder (raw TensorRT, no ORT)
-//   otherwise                 → SCRFDDecoder (ONNX Runtime)
+// The inference backend (ONNX Runtime or raw TensorRT) is selected at compile
+// time; this node talks only to IFaceDetector via make_face_detector(cfg).
 
 struct FaceDetectorFunc {
     static constexpr std::string_view label() { return "face_detector"; }
 
-    explicit FaceDetectorFunc(const Config& cfg, OrtProvider provider)
-        : max_faces_(cfg.max_faces)
+    explicit FaceDetectorFunc(const Config& cfg)
+        : detector_(make_face_detector(cfg))
+        , max_faces_(cfg.max_faces)
         , min_face_px_(cfg.min_face_px)
-    {
-        if (!cfg.detector_engine.empty()) {
-            trt_ = std::make_unique<TrtScrfdDecoder>(
-                cfg.detector_engine, cfg.detector_conf, cfg.detector_nms);
-        } else {
-            ort_ = std::make_unique<SCRFDDecoder>(
-                cfg.detector_model, cfg.detector_conf, cfg.detector_nms, provider, cfg.trt);
-        }
-    }
+    {}
 
     SceneFrame operator()(Frame f) {
         if (f.eof) return {std::move(f), {}};
 
-        auto faces = trt_ ? trt_->detect(f.image) : ort_->detect(f.image);
+        auto faces = detector_->detect(f.image);
 
         // Drop faces below minimum pixel size (too small for reliable ArcFace alignment)
         faces.erase(
@@ -54,8 +45,7 @@ struct FaceDetectorFunc {
     }
 
 private:
-    std::unique_ptr<SCRFDDecoder>    ort_;
-    std::unique_ptr<TrtScrfdDecoder> trt_;
-    int                              max_faces_{10};
-    float                            min_face_px_{40.f};
+    std::unique_ptr<IFaceDetector> detector_;
+    int   max_faces_{10};
+    float min_face_px_{40.f};
 };