Re: [Ccrtp-devel] problem while reducing the seding rate

[David Sugar]

Oh, this is about sending 2833 events, not receiving...sorry :).  Hmm, 
let me think about this one further!

Michel de Boer wrote:
> Hi Dinil,
>
> This sounds like the problem that I had with sending RTP DTMF events.
> All RTP packets in this case have the same timestamp and ccRTP
> discards packets when the timestamp gets too old.
>
> In your case you increase the PERIOD, but it seems that
> you keep the payload size of your packets the same. That means
> that the timestamps you provide with putData will not be in
> sync with the timestamp clock from ccRTP itself. The timestamp
> of your second packet indicates that this packet should come 50ms after
> the first packet. But you only deliver it 100ms after the first
> packet.
>
> I think you have to deliver the data to ccRTP with the correct
> rate (depending on the number of samples per second). So if you
> want to double the period from 50 to 100 then you should also double
> the size of your payload.
>
> Regards,
> Michel
>
>
>
> Dinil Divakaran wrote:
>
> > Hi all,
> >
> > I was working on an example for transmitting an audio file using ccrtp 
> > (http://www.gnu.org/software/ccrtp/doc/refman/html/audiotx_8cpp-example.html) 
> >
> >
> > The following lines are from the above example. In this code, packets are
> > sent and then thread sleeps for a time of 'PERIOD' milliseconds. I 
> > changed
> > the value of PERIOD to 100 (milliseconds) and found that even though the
> > program says that the packets are sent; the packets weren't actually 
> > sent.
> > 'tcpdump' showed that only the first packet was sent; and thereafter only
> > RTCP packets were sent (with still lesser frequency). When I changed the
> > value of 'PERIOD' to 50, the packets were sent successfully.
> >
> > Can anyone please tell me where have I gone wrong ?
> >
> > -------------------------------------------------------------------------- 
> >
> >                               .
> >                               .
> >                               .
> >
> >         cout << "Transmitting " << PACKET_SIZE
> >              << " octects long packets "
> >              << "every " << PERIOD << " milliseconds..." << endl;
> >
> >         unsigned char buffer[PACKET_SIZE];
> >         int count=PACKET_SIZE;
> >
> >         // This will be useful for periodic execution
> >         TimerPort::setTimer(PERIOD);
> >
> >         setCancel(cancelImmediate);
> >         // This is the main loop, where packets are transmitted.
> >         for( int i = 0 ; (!sendingfile || count > 0) ; i++ ){
> >
> >             count = ::read(audioinput,buffer,PACKET_SIZE);
> >             if( count > 0 ){
> >                 // send an RTP packet, providing timestamp,
> >                 // payload type and payload.
> >                 socket->putData(PACKET_SIZE * i, buffer, PACKET_SIZE);
> >             }
> >             cout << "." << flush;
> >
> >             // Let's wait for the next cycle
> >             Thread::sleep(TimerPort::getTimer());
> >             TimerPort::incTimer(PERIOD);
> >         }
> >         cout << endl << "I have got no more data to send. " <<endl;
> >
> >                               .
> >                               .
> >                               .
> >                               .
> > -------------------------------------------------------------------------- 
> >
> >
> > - Dinil
> >
> >
> >
> > _______________________________________________
> > Ccrtp-devel mailing list
> > address@hidden
> > http://lists.gnu.org/mailman/listinfo/ccrtp-devel
>
>
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