hust_rtpmkssrc.c

来自「实现基于ip2022的MPEG2 TS的IP组播接收」· C语言 代码 · 共 30 行

/*-------------------------------------------------------------------------
 * rtpmkssrc.c - rtpmkssrc
 *-------------------------------------------------------------------------
 */

/*#include <stdlib.h>
#include <rtp.h>
#include <hash.h>*/
#include "hust_rtp.h"
#include "hust_hash.h"

/*------------------------------------------------------------------------
 * rtpmkssrc - generate a unique synchronization source identifier.
 * This does not use the random number generater presend in RFC 1889.
 *------------------------------------------------------------------------
 */
ssrc_t
rtpmkssrc(struct session *psn)
{

	ssrc_t ssrc;

	do {
		ssrc = random_get32();
		///要得到随机数
	} while (psn != NULL ? htget(psn->sn_ssrcs, ssrc) != NULL : 0);

	return ssrc;
}