将编码的音频文件转换为带有信号值的文本

I've been programming in c for the first time with audio files. I found this code which supposedly should read an audio file and then write a csv file containing several info in order to analyse the audio waves,that in case will be a simple voice: i'm interested in amplitude of the waves, in the timbre of the voice and its hight and extension. I've been programming in c for the first time w