util.h

linux环境下用纯c写的RTP协议的通用开发库

/*-------------------------------------------------------------------------
 * util.h - align, hton24
 *-------------------------------------------------------------------------
 */

#ifndef UTIL_H
#define UTIL_H

#include <time.h>
#include <rtp.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))
#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