/*------------------------------------------------------------------------- * util.h - align, hton24 *------------------------------------------------------------------------- */#ifndef UTIL_H#define UTIL_H#include "hust_rtp.h"#include "hust_rtplibcommon.h"/* thread states */#define THR_NOTRUNNING   0#define THR_INITIALIZING 1#define THR_RUNNING      2#define THR_TERMINATE    3#define UTIL_STOPTHREADDELTA {0, 10000000} /* 10 ms */#define UTIL_STOPTHREADMAXTRIES 15	   /* max signals to send *//* Misc utilities */#define align(val, align) (val + (val % align != 0 ? align - (val % align) : 0))///返回一個不比val小且能被align整除的最小的數///該宏用在為數據包設定以32bit長結尾的情況下時使用#define hton24(v)            (((v&0xff) << 16) | (v&0xff00) | ((v&0xff0000)>>16))/* Time utilities */struct timespec timesub(struct timespec, struct timespec);struct timespec timeadd(struct timespec, struct timespec);mediatime_t timeflatten(struct timespec, int);struct timespec timeunflatten(mediatime_t, int);int timecmp(struct timespec, struct timespec);/* Thread utilities *////int startthread(pthread_t *, void *(*)(void *), void *, pthread_mutex_t *, pthread_cond_t *, int *);///int stopthread(pthread_t *, pthread_mutex_t *, pthread_cond_t *, int *);/* signal handler *////void nullfcn(int);#endif