Cristiano Belloni wrote: > Ross Finlayson wrote: > >>> Ross Finlayson wrote: >>> >>> >>>>> However, I need some info: the camera I'm contacting does not send normal >>>>> video frames, but custom ones. I need to unpack every RTP packet (_in >>>>> order_), read the custom headers, reconstruct the frames and decode them >>>>> on the fly. >>>>> >>>>> >>>>> >>>> Because your 'custom headers' are not RTP-specific, but are instead >>>> part of your payload, you should not write any new RTP-specific code >>>> for this. Instead, just have the object that reads from your >>>> "RTPSource" (subclass) object do the processing/decoding of these >>>> custom frames. >>>> >>>> >>>> >>>> >>> Ehm, sorry, I didn't understand your answer. Do you mean I should >>> subclass RTPSource? >>> >>> >> I'm saying that you might not need to write any new (sub)classes at >> all. Can you tell me some more about what your data looks like - >> i.e., what video codec are you using, and how is the data different >> from the standard? >> >> > It's MPEG-4 data, 1440 bytes a packet. At the start of each packet > there's a 16 or 6 bytes header that I must read, depending on the fact > the packet starts a frame or is a middle/ending packet. > > I'd need to analyze the payload of every RTP packet I receive, read the > header, accumulate the MPEG-4 data following the header and, as soon as > I have an MPEG-4 frame, pass it to a decoder. > > Is there something like a function that is called everytime I get an RTP > packet, so I can examine its payload? > > Alternatively, I could parse a whole frame, recognize the headers and extract them. Maybe the way to go is to set afterGettingFunc <http://www.live555.com/liveMedia/doxygen/html/classFramedSource.html#e39d6c83790473cabce9b4cdb873c50d> inside the RTPSource? But it seems I can't do it without subclassing.
Please note I would like to analyze packets in memory buffers in a packet per packet or, if it's not possible, frame - per frame fashion, so I don't want to use use pipes and the like (for example, to redirect stream to stdout and analyze it in another piped process). -- Belloni Cristiano Imavis Srl. www.imavis.com <http://www.imavis.com> [EMAIL PROTECTED] <mailto://[EMAIL PROTECTED]> _______________________________________________ live-devel mailing list live-devel@lists.live555.com http://lists.live555.com/mailman/listinfo/live-devel
