FFMPEG源码中解码H264部分的decode_frame函数的调用关系图，详细到每一个被调函数，以及被调函数的被吊函数等。学习FFMPEG解码流程很好的帮助文档。-FFMPEG source code decoding H264 part decode_frame function call graph, each one in detail to the called function, and the called function was hanging functions, etc.