Hello,
I’m having some issues with an iOS application I am currently building using
the LibLinphone iOS SDK. I am using the oRTP library within the SDK to receive
an RTP stream from a Raspberry Pi and play this back on the iOS device. I am
running on an iPad mini iOS 9.3.5. My code using the oRTP library is very
similar to the rtprecv.c example included within the oRTP library. I’ll include
this below:
RtpSession *session;
unsigned char buffer[160];
int err;
uint32_t ts=0;
int stream_received=0;
int have_more;
bool_t adapt=TRUE;
/* init the lib */
ortp_init();
ortp_scheduler_init();
signal(SIGINT,stop_handler);
session=rtp_session_new(RTP_SESSION_SENDRECV);
rtp_session_set_scheduling_mode(session,FALSE);
rtp_session_set_blocking_mode(session,FALSE);
rtp_session_set_local_addr(session,"0.0.0.0",3550, 3551);
rtp_session_enable_adaptive_jitter_compensation(session,adapt);
rtp_session_set_jitter_compensation(session,40);
rtp_session_set_payload_type(session,0);
rtp_session_signal_connect(session,"ssrc_changed",(RtpCallback)ssrc_cb,0);
rtp_session_signal_connect(session,"ssrc_changed",(RtpCallback)rtp_session_reset,0);
while(cond)
{
have_more=1;
while (have_more){
err= rtp_session_recv_with_ts(session, buffer, 160, ts, &have_more);
if (err>0) stream_received=1;
/* this is to avoid to write to disk some silence before the first
RTP packet is returned*/
if ((stream_received) && (err>0)) {
//this is where I will write the buffer to audio output
}
}
/* Follow the RFC, payload 0 has 8kHz reference rate */
ts+= frame_size * 8000 / sample_rate;
}
The first issue was found when running this code with
session=rtp_session_new(RTP_SESSION_RECVONLY);
Xcode gives an lldb error with "Thread 1: EXC_BAD_ACCESS (code=1, address=0x8)”
given on the line err= rtp_session_recv_with_ts(session, buffer, 160, ts,
&have_more);
if I change the session to RTP_SESSION_SENDRECV I no longer get this error.
Instead I now get Thread 1: signal SIGABRT and:
malloc: *** error for object 0x16b22e04: incorrect checksum for freed object -
object was probably modified after being freed.
*** set a breakpoint in malloc_error_break to debug
Again, this happens when calling rtp_session_recv_with_ts(session, buffer, 160,
ts, &have_more);
If anyone can point me in the right direction with this I’d greatly appreciate
it.
Many thanks,
Ryan
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