Re: problem while reducing the seding rate

Thanks for the explanation; I seem to grasp your point.

But, can I not do the same using onExpireSend and putData ?

onExpireSend should be given point to OutgoingRTPPkt as 
argument; but I don't know how to use it with putData. Can
anyone please help ?

- Dinil

On Wed, 11 May 2005, 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
>> [email protected]
>> http://lists.gnu.org/mailman/listinfo/ccrtp-devel
>> 
>> 
>