#include extern WAV twav; FILE * readWAVInfo(void){ FILE *fp = NULL; struct WAV_Format wav; fp = fopen("test.wav", "rb"); fread(&wav, 1, sizeof(struct WAV_Format), fp); return fp; } int init_test_wav(int ms) { twav.getInfo(); twav.setTimer(ms); return sqrt(twav.m_pss.step); }