Use factory to create encoder/decoder

src/media/video/decode/video_decoder.h

@@ -0,0 +1,16 @@
+#ifndef _VIDEO_DECODER_H_
+#define _VIDEO_DECODER_H_
+
+#include <functional>
+
+#include "frame.h"
+
+class VideoDecoder {
+ public:
+  virtual int Init() = 0;
+  virtual int Decode(
+      const uint8_t *data, int size,
+      std::function<void(VideoFrame)> on_receive_decoded_frame) = 0;
+};
+
+#endif