Re: [Ccrtp-devel] How to send a RTCP SR packet first?

[saurabh99]

HI

I want to know How can I make RTCP packet and send it to participents? 

Thanks
Saurabh


Martin Runge-2 wrote:
> 
> Hi .*,
> 
> I am evaluating ccrtp for an audio streaming solution (muroa.berlios.de).
> So 
> far, I found all the features I need in ccrtp (1.5.1), but there is one
> thing 
> left:
> 
> How can I make the sender send a RTCP SR right at the start? I need it, to 
> have the RTP-NTP timestamp correlation to start playback on the client 
> synchronously to other clients.
> 
> Background: What I want do do is start a new session with a burst, so the 
> client can start playback immediately with the first data packet and gets
> its 
> receive buffer filled anyway. I managed to tell ccrtp to perform a burst
> in 
> starting the RTP timestamp at negative numbers, so all data packets with
> RTP 
> timestamp < 0 will be sent immediately. All packets with RTP ts > 0 will
> be 
> correctly scheduled.
> 
> With that burst, the client can start playback immediately after receiving
> the 
> first packet. The problem is, that I need the first SR early. I have seen
> in 
> the source, the first RTCP packet will be a RR, because no data packets
> have 
> been sent yet. The second RTCP packet is a SR (data has been sent in the 
> meanwhile), but it arrives after ~20 RTP data packets (5% bandwidth for 
> control).
> 
> Any ideas, how to get a SR packet out of an unmodified ccrtp stack at
> before 
> or directly after the first data packet?
> 
> By the way: where to specify the NTP timestamp in the API?
> 
> I would be thankful for any tips or ideas regarding this topic.
> 
> Thanks in advance,
> Regards, 
> 
> Martin
> 
> 
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> 
> 

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