How to display a PBFrame in iOS - iphone

Question

I am currently working on an app which uses a live stream from an IP camera(PnP IP/Network camera manufactured by V Star). When connected using the Api provided I get the frame o/p as PBFrames. I am having trouble displaying them. anybody who have been through it please help. Thanks in advance
void *thread_ReceiveVideo(void *arg)
{
NSLog(#"[thread_ReceiveVideo] Starting...");
int avIndex = *(int *)arg;
char *buf = malloc(VIDEO_BUF_SIZE);
unsigned int frmNo;
int ret;
FRAMEINFO_t frameInfo;
while (1)
{
ret = avRecvFrameData(avIndex, buf, VIDEO_BUF_SIZE, (char *)&frameInfo, sizeof(FRAMEINFO_t), &frmNo);
if(ret == AV_ER_DATA_NOREADY)
{
usleep(30000);
continue;
}
else if(ret == AV_ER_LOSED_THIS_FRAME)
{
NSLog(#"Lost video frame NO[%d]", frmNo);
continue;
}
else if(ret == AV_ER_INCOMPLETE_FRAME)
{
NSLog(#"Incomplete video frame NO[%d]", frmNo);
NSLog(#" the biffer is : %lu",sizeof(buf));
continue;
}
else if(ret == AV_ER_SESSION_CLOSE_BY_REMOTE)
{
NSLog(#"[thread_ReceiveVideo] AV_ER_SESSION_CLOSE_BY_REMOTE");
break;
}
else if(ret == AV_ER_REMOTE_TIMEOUT_DISCONNECT)
{
NSLog(#"[thread_ReceiveVideo] AV_ER_REMOTE_TIMEOUT_DISCONNECT");
break;
}
else if(ret == IOTC_ER_INVALID_SID)
{
NSLog(#"[thread_ReceiveVideo] Session cant be used anymore");
break;
}
NSLog(#"FRAM INFO FLAG :%hhu ",frameInfo.flags);
if(frameInfo.flags == IPC_FRAME_FLAG_PBFRAME)
{
// got an PBFrame, draw it.
NSLog(#"got a video iframe to display");
// NSString *iFramestring = [NSString stringWithUTF8String:buf];
printf("correclty recieved frame is %s",buf);
//
}
}
free(buf);
NSLog(#"[thread_ReceiveVideo] thread exit");
return 0;
}