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

include/libplacebo.h

@@ -0,0 +1,21 @@
+#ifndef PLACEBO_H
+#define PLACEBO_H
+
+#include <filesystem>
+
+#include <libavcodec/avcodec.h>
+#include <libavfilter/avfilter.h>
+#include <libavutil/buffer.h>
+
+int init_libplacebo(
+    AVFilterGraph **filter_graph,
+    AVFilterContext **buffersrc_ctx,
+    AVFilterContext **buffersink_ctx,
+    AVBufferRef **device_ctx,
+    AVCodecContext *dec_ctx,
+    int output_width,
+    int output_height,
+    const std::filesystem::path &shader_path
+);
+
+#endif  // PLACEBO_H