[Live-devel] How do I get the data from the lower levels..... Another DoGetNextFrame question

[Waters, Ralph]

Hi All,

First, I am very grateful for this mailing list and the help it gives. I
will try to make sure I can help support the community for this
wonderful tool, as much as I can.
This is a question about how to get the data from the lower layer
software, so I can pass it to a decoder later in a pipeline. I have an
Live555 client application that is receiving MPEG4 data from an RTP
source. I am using a file sink
to verify that the data is being received correctly. This works. What I
really want to do is to receive the MPEG4 (or H.264) data AFTER it is
reassembled from the incoming RTP packets.
I have my poll loop up and running, but am terribly confused as what to
do to get the data. I don't understand if doGetNextFrame is for the
incoming RTP packets, or for the processed sink packets.


I didn't understand the answer to:

>Is there maybe a way to directly schedule a call to
>*doGetNextFrame()* in the event loop since this is not a static 
>function or what would be the alternative

The alternative is to write a static member function that then calls
"doGetNextFrame()", and have "scheduleDelayedTask()" arrange to call the
static member function.  There are several examples of this in the code
already.

Also, as I noted last time, you should not call "usleep(10)"; instead,
pass 10 as the (delay) parameter to "scheduleDelayedTask()".


The first note I have is that all the code in the playCommon.hh, and all
the samples in testProgs do not use any client data. You have a
checkForPacketArrival(void * /*clientData*/) in which no one seems
interested
In the returned data. For example the call to it (at the end of
startPlayingStreams) is:   
  // Watch for incoming packets (if desired):
  checkForPacketArrival(NULL);

If I had multiple sources, how could I ever tell which stream it was. By
it's name it appears to be an INCOMING packet.

Do I have to rewrite a sink, like MPEG4ESVideoRTPSink, or
H264VideoRTPSink  to get the processed packets?

I don't think so. I think I am really to implement the callback for the
fAfterGettingFunc for the FramedSource, but I have no idea how to do
this.


Again, Thank you very much, Rusty


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