Hi,
Incrementing the timestamp by the value returned by rtp_session_recv_with_ts()
is a bad idea. Increment it by 10 or 20 ms, converted into samples unit, so
80 or 160 using a 8000Hz clockrate.
Simon
Le Thursday 10 January 2008 02:23:49 god lu, vous avez écrit :
> Hi all,
> I am using ortp to send and receive audio packets bwtween my pc and
> developing board. I have made oRTP work in schedule mode not in blocking
> mode, the code is:
>
> *mysession = rtp_session_new(RTP_SESSION_SENDRECV);*
> * rtp_session_set_scheduling_mode(mysession, 1); *
> * rtp_session_set_blocking_mode(mysession, 0);*
>
> * rtp_session_enable_adaptive_jitter_compensation(mysession, TRUE);
> rtp_session_set_recv_buf_size(mysession,1024);
> rtp_session_set_local_addr(mysession, _localip, 10500);
> rtp_session_set_remote_addr(mysession, remote_sdp_audio_ip,
> remote_sdp_audio_port);
>
> rtp_session_set_payload_type(mysession, payload);*
>
> when receiving packets i use :
> * SessionSet *recv_session_set;
> recv_session_set = session_set_new();
> session_set_set(recv_session_set, mysession);*
> * *
> * while(1)*
> * {*
> * ret = session_set_select(recv_session_set, NULL, NULL);
> if((ret != -1) && session_set_is_set(recv_session_set, mysession))
> {
> i = rtp_session_recv_with_ts(mysession, data_in, length,
> timestamp, &have_more); *
> * if (i > 0)*
> {
> * // then i save the data_in to a file and do other
> things.*
> *timestamp += i;*
> }
> * *
> * }*
> * // do other thins*
> * }*
> when I send the packets I use *rtp_session_send_with_ts( ) *to send
> packets directly. Both my board and pc work in the same way.
>
> And the problem is, when I speak about 10s on the board side (i save my
> voice to a file), and the pc side receive about 8s of my voice ( i also
> save the packets received to a file).
> According to reading the source code, I know in schedule mode (the
> blocking mode is off), we can use *session_set_select* to block the thread
> until the packet arrives, then we can use *rtp_session_recv_with_ts *to
> receive packets.
> But now, obviously there are some packets lost. In my program the packet
> size is 320, and the timestamp is incresed by 320.
>
> Would anyone please give me some advice to solve this problem?
> Any other care needs to be taken.?
> * *
> By the way, when I set both blocking mode and schedule mode on, there are
> more packets lost.
>
> Thank you in advance!
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