Use factory to create encoder/decoder

src/media/video/decode/nvcodec/nvidia_video_decoder.h

@@ -0,0 +1,26 @@
+#ifndef _NVIDIA_VIDEO_DECODER_H_
+#define _NVIDIA_VIDEO_DECODER_H_
+
+#include <functional>
+
+#include "NvDecoder.h"
+#include "video_decoder.h"
+
+class NvidiaVideoDecoder : public VideoDecoder {
+ public:
+  NvidiaVideoDecoder();
+  ~NvidiaVideoDecoder();
+
+ public:
+  int Init();
+  int Decode(const uint8_t* data, int size,
+             std::function<void(VideoFrame)> on_receive_decoded_frame);
+
+ private:
+  NvDecoder* decoder = nullptr;
+  bool get_first_keyframe_ = false;
+  bool skip_frame_ = false;
+  FILE* file_ = nullptr;
+};
+
+#endif