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

include/decoder.h

@@ -0,0 +1,15 @@
+#ifndef DECODER_H
+#define DECODER_H
+
+#include <libavcodec/avcodec.h>
+#include <libavfilter/avfilter.h>
+#include <libavformat/avformat.h>
+
+int init_decoder(
+    const char *input_filename,
+    AVFormatContext **fmt_ctx,
+    AVCodecContext **dec_ctx,
+    int *video_stream_index
+);
+
+#endif  // DECODER_H