feat(*): rewritten the project with C/C++ (#1172)

include/libplacebo_filter.h

@@ -0,0 +1,39 @@
+#ifndef LIBPLACEBO_FILTER_H
+#define LIBPLACEBO_FILTER_H
+
+#include <filesystem>
+
+#include <libavutil/buffer.h>
+
+#include "filter.h"
+
+// LibplaceboFilter class definition
+class LibplaceboFilter : public Filter {
+   private:
+    AVFilterGraph *filter_graph;
+    AVFilterContext *buffersrc_ctx;
+    AVFilterContext *buffersink_ctx;
+    AVBufferRef *device_ctx;
+    int output_width;
+    int output_height;
+    const std::filesystem::path shader_path;
+    AVRational output_time_base;
+
+   public:
+    // Constructor
+    LibplaceboFilter(int width, int height, const std::filesystem::path &shader_path);
+
+    // Destructor
+    virtual ~LibplaceboFilter();
+
+    // Initializes the filter with decoder and encoder contexts
+    int init(AVCodecContext *dec_ctx, AVCodecContext *enc_ctx) override;
+
+    // Processes an input frame and returns the processed frame
+    AVFrame *process_frame(AVFrame *input_frame) override;
+
+    // Flushes any remaining frames
+    int flush(std::vector<AVFrame *> &processed_frames) override;
+};
+
+#endif  // LIBPLACEBO_FILTER_H