hust_rtpsources.c

来自「实现基于ip2022的MPEG2 TS的IP组播接收」· C语言 代码 · 共 51 行

/*-------------------------------------------------------------------------
 * rtpsources.c - rtpsources
 *-------------------------------------------------------------------------
 */

/////#include <stdlib.h>
#include "hust_rtp.h"
#include "hust_hash.h"

/*-------------------------------------------------------------------------
 * rtpsources - fill array sources with a list of synchronization sources
 * participating in the session and return list's length.
 * Maxsources gives the size of the area pointed to by sources in 
 * sizeof(ssrc_t) (short) units.
 *-------------------------------------------------------------------------
 */
int
rtpsources(struct session *psn, ssrc_t *sources, u16_t maxsources)
{

	struct htent	**v;
	int		htcount, i, count;

	///if (pthread_mutex_lock(&psn->sn_getstreammutex) != 0)
		///return ERROR;

	if ((v = htenum(psn->sn_ssrcs)) == NULL) {
		////pthread_mutex_unlock(&psn->sn_getstreammutex);
		return ERROR;
	}
	////正确获得一个会话中所有的同步源
	
	for (htcount = 0; v[htcount] != NULL; htcount++);
  
	maxsources = min(maxsources, htcount);
	///数组的大小不能大于maxsources，否则溢出
  
	for (i = 0, count = 0; count < maxsources && i < htcount; i++)
		if (((struct stream *) v[i]->hte_object)->stm_zombie != TRUE) {
			sources[i] = v[i]->hte_key;
			count++;
		}
		///sources中放的是哈希表的key

	////pthread_mutex_unlock(&psn->sn_getstreammutex);
	///free(v);
	return maxsources;
}
/////把一个会话中的所有的同步源的key放到一个数组中
/////并返回数组的大小