对X264编码器的C++接口封装，方便初学者使用，只需要使用IH264Encoder接口，传入简单的参数即可，输入YUV420P帧，得到编码后数据，并包含NALU的分片信息以及帧类型信息。-On the X264 encoder C++ interface package, easy for beginners to use, only need to use IH264Encoder interface parameters can be passed in a simple, enter YUV420P frame to give the coded data, and contains information NALU fragments and frame type information.