[Live-devel] push and pull streaming

[Ross Finlayson]

>I read in the FAQ section that it is possible to modify the 
> test*Streamer application to stream from an Mpeg encoder.  Doing 
>that change will switch the library from a pulling to pushing 
>streaming model.

No.  The library always works by having each downstream object call 
its upstream object, asking for data.  However, when you're streaming 
from a live source (such as an encoder), the key point to note is 
that the arrival of data from the live source is best handled as an 
event in the event loop (rather than a synchronous read).  In any 
case, the live source is encapsulated in a subclass (that you would 
write) of "FramedSource", and new data is delivered to the downstream 
object in your implementation of the virtual function 
"doGetNextFrame()".


>I'm also concerned by the fact that a hardware encoder might have a 
>different system clock (hardware based) than the library which seems 
>to be CPU based?

This should not be a problem.  If - in your "FramedSource" subclass - 
you *don't* set the "fDurationInMicroseconds" field.  By not setting 
this field, it remains at its default value of 0, and the (RTP) sink 
object will ask for new data immediately after it sends a packet.
-- 

Ross Finlayson
Live Networks, Inc.
http://www.live555.com/
-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://lists.live555.com/pipermail/live-devel/attachments/20071214/b8666a2a/attachment-0001.html