synstreamoff.c

linux环境下用纯c写的RTP协议的通用开发库

/*-------------------------------------------------------------------------
 * synstreamoff.c - synstreamoff
 *-------------------------------------------------------------------------
 */

#include <rtp.h>
#include <syn.h>

/*------------------------------------------------------------------------
 * synstreamoff - turn off a stream at the synchronization layer and mark
 * it for removal. Unlike at the RTP layer, it is not necessary to hold
 * state for streams that the application is not interested in receiving.
 *------------------------------------------------------------------------
 */
int
synstreamoff(struct synsession *pssn, ssrc_t ssrc)
{
  
	struct synstream *psstm;
	struct session   *psn;

	psn = pssn->ssn_session;

	psstm = syngetstream(pssn, ssrc);
	if (psstm == NULL)
		return ERROR;

	/* 
	 * Turn off the stream at the RTP layer.
	 */
	rtpstreamoff(psn, ssrc);

	/* 
	 * The following code handles the case where a thread is 
	 * still in synread. The stream is marked as a zombie,
	 * the reader is signaled.
	 */
	pthread_mutex_lock(&psstm->sstm_readmutex);
	psstm->sstm_zombie = TRUE;
	pthread_cond_broadcast(&psstm->sstm_readcond);
	pthread_mutex_unlock(&psstm->sstm_readmutex);

	synreleasestream(pssn, psstm);
	return OK;
}