Re: [Linphone-users] meeting problem when using ortp with version of 0.13.1

[god lu]

Hi,

   Thank you very much!

   I have solved the problem according to you advice.

 

 

2008/1/19, Simon Morlat <address@hidden>:

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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