hust_time_qiu_5.20.c

实现基于ip2022的MPEG2 TS的IP组播接收

/* time.c - timeadd, timesub, timeflatten, timeunflatten, timecmp */
#include <ipOS.h>
#include <ipHAL.h>
#include "hust_util.h"
#include "hust_rtplibcommon.h"

/*-----------------------------------------------------------------------
 * timeadd - add two struct timespecs
 *-----------------------------------------------------------------------
 */
u32_t
timeadd(u32_t a, u32_t b)
{

	return (a+b);
}

/*-----------------------------------------------------------------------
 * timesub - subtract struct timespec b from a
 *-----------------------------------------------------------------------
 */
s32_t
timesub(u32_t a, u32_t b)
{

/*	struct timespec c;
  
	c.tv_sec = a.tv_sec - b.tv_sec;
	c.tv_nsec = a.tv_nsec - b.tv_nsec;
*/
	/* borrow if necessary */
/*	if (c.tv_nsec < 0) {
		c.tv_nsec += 1000000000;
		c.tv_sec--;
	}
	else if (c.tv_nsec > 1000000000) {
		c.tv_nsec -= 1000000000;
		c.tv_sec++;
	}*/
	return (a-b);
}

/*-----------------------------------------------------------------------
 * timeflatten - convert a struct timespec to a flat time value
 *-----------------------------------------------------------------------
 */
s32_t 
timeflatten(s32_t t, u32_t clkrt)
{
	u32_t	rv;
	rv=(t*clkrt)/TICK_RATE;
/*	int rv;
	double d;

	rv = t.tv_sec *
	 clkrt;

	d = (double) t.tv_nsec * .000000001;
	d *= (double) clkrt;

	rv += (int) d;*/

	return rv;
}

/*------------------------------------------------------------------------
 * timeunflatten - convert a flat time value to a struct timespec
 *------------------------------------------------------------------------
 */
u32_t
timeunflatten(mediatime_t t, int clkrt)
{

	u32_t	ts;
	ts=(t*TICK_RATE)/clkrt;
	/*double	d;

	ts.tv_sec = t / clkrt;
	d = ((double) (t % clkrt)) / ((double) clkrt);
	ts.tv_nsec = (int) (d * (double) 1000000000);
	*/
	return ts;
}

/*------------------------------------------------------------------------
 * timecmp - compare two strucxt timespecs. Return -1 if a is after b, 
 * 1 if b is after a, or 0 if equal. Yes, this is backward wrt to 
 * convention.
 *------------------------------------------------------------------------
 */
int
timecmp(u32_t a, u32_t b)
{
  
	if (a < b)
		return 1;
  
	if (a > b)
		return -1;    

	return 0;
}