feat(realcugan): add support for Real-CUGAN ncnn Vulkan (#1268)

Signed-off-by: k4yt3x <i@k4yt3x.com>

include/libvideo2x/filter_realcugan.h

@@ -0,0 +1,63 @@
+#pragma once
+
+extern "C" {
+#include <libavcodec/avcodec.h>
+}
+
+#include "processor.h"
+#include "realcugan.h"
+
+namespace video2x {
+namespace processors {
+
+// FilterRealcugan class definition
+class FilterRealcugan : public Filter {
+   public:
+    // Constructor
+    FilterRealcugan(
+        int gpuid = 0,
+        bool tta_mode = false,
+        int scaling_factor = 4,
+        int noise_level = -1,
+        int num_threads = 1,
+        int syncgap = 3,
+        const fsutils::StringType model_name = STR("models-pro")
+    );
+
+    // Destructor
+    virtual ~FilterRealcugan() override;
+
+    // Initializes the filter with decoder and encoder contexts
+    int init(AVCodecContext *dec_ctx, AVCodecContext *enc_ctx, AVBufferRef *hw_ctx) override;
+
+    // Processes an input frame and returns the processed frame
+    int filter(AVFrame *in_frame, AVFrame **out_frame) override;
+
+    // Returns the filter's type
+    ProcessorType get_processor_type() const override { return ProcessorType::RealCUGAN; }
+
+    // Returns the filter's output dimensions
+    void get_output_dimensions(
+        const ProcessorConfig &proc_cfg,
+        int in_width,
+        int in_height,
+        int &out_width,
+        int &out_height
+    ) const override;
+
+   private:
+    RealCUGAN *realcugan_;
+    int gpuid_;
+    bool tta_mode_;
+    int scaling_factor_;
+    int noise_level_;
+    int num_threads_;
+    int syncgap_;
+    const fsutils::StringType model_name_;
+    AVRational in_time_base_;
+    AVRational out_time_base_;
+    AVPixelFormat out_pix_fmt_;
+};
+
+}  // namespace processors
+}  // namespace video2x

include/libvideo2x/processor.h

@@ -23,6 +23,7 @@ enum class ProcessorType {
     None,
     Libplacebo,
     RealESRGAN,
+    RealCUGAN,
     RIFE,
 };
 
@@ -35,6 +36,13 @@ struct RealESRGANConfig {
     fsutils::StringType model_name;
 };
 
+struct RealCUGANConfig {
+    bool tta_mode = false;
+    int num_threads = 1;
+    int syncgap = 3;
+    fsutils::StringType model_name;
+};
+
 struct RIFEConfig {
     bool tta_mode = false;
     bool tta_temporal_mode = false;
@@ -49,9 +57,10 @@ struct ProcessorConfig {
     int width = 0;
     int height = 0;
     int scaling_factor = 0;
+    int noise_level = -1;
     int frm_rate_mul = 0;
     float scn_det_thresh = 0.0f;
-    std::variant<LibplaceboConfig, RealESRGANConfig, RIFEConfig> config;
+    std::variant<LibplaceboConfig, RealESRGANConfig, RealCUGANConfig, RIFEConfig> config;
 };
 
 class Processor {