hust_rtpstreamon.c

来自「实现基于ip2022的MPEG2 TS的IP组播接收」· C语言 代码 · 共 39 行

/*-------------------------------------------------------------------------
 * rtpstreamon.c - rtpstreamon
 *-------------------------------------------------------------------------
 */

#include "hust_rtp.h"

/*------------------------------------------------------------------------
 * rtpstreamon - begin enqueuing packets for a particular stream.
 * The parameter clockrate is the stream's media clockrate in Hz.
 * The clockrate is necessary at the RTP layer to computer jitter stats.
 *------------------------------------------------------------------------
 */
int
rtpstreamon(struct session *psn, ssrc_t ssrc, u32_t clockrate)
{

	struct stream *pstm;

	pstm = rtpgetstream(psn, ssrc);

	if (pstm == NULL) 
		return ERROR;

	if (pstm->stm_enqueue == TRUE) {
		/* 
		 * Return ERROR if stream is already ``on''.
		 */
		rtpreleasestream(psn, pstm);
		return ERROR;
	}

	pstm->stm_clkrt = clockrate;
	pstm->stm_enqueue = TRUE;
	rtpreleasestream(psn, pstm);

	return OK;
}