[Live-devel] using live555 with in memory data

[Joshua Kordani]

Greetings all,

I wish to use live555 to deliver in memory nals created with x264. In my 
application, I spawn off the live555 event loop into a separate thread 
from the one responsible for doing the encoding.  I am configuring my 
encoder to output nals that will fit inside the standard mtu.

In order to pass data from the encoder thread to the live555 thread, I 
am anticipating implementing a series of buffers, with a control scheme 
to switch back and forth to allow for minimal blocking, ie, the live555 
thread will always have a static buffer of known content length to read 
from, the encoder thread will always have a similar buffer to write to, 
and there will be a back-buffer with a complete buffer of data ready to 
go should there be a point where all data has been read but the writer 
is still writing.

I have a couple questions.

Given what I've read so far, I should subclass ServerMediaSubsession and 
implement createNewStreamSource, making use of ByteStreamMemorySource 
class in some way.  Given that I'll be changing the buffer to be read 
from, does this mean that I will have to create a new instance of the 
custom sms every time there is a new buffer to read from?  Or instead, 
will my custom sms need to handle the setup and teardown of 
ByteStreamMemorySources?  Or else, how is it anticipated that an in 
memory location be used to pass data to the live555 event loop when the 
data is sourced from a different thread?  Would it be easier to simply 
memmove the data to be read into the readbuffer instead of change the 
readbuffer's location?

Also, I notice that the createNewStreamSource call returns a framed 
source object, of which H264FUAFragmenter seems to implement, and whose 
methods seem to suggest that it is intending to be used to feed nals to 
some upper layer.  Given also that I am already creating nals small 
enough to be packed inside an individual rtp packet, and the 
FUAFragmenter class seems to have code in it to handle nals of varrying 
sizes, is it the correct class for use in implementing the 
createNewStreamSource as mentioned above?  I've read through some 
examples, but what I'm supposed to make happen inside of a 
createNewStreamSource hasn't clicked with me yet.

Thank you very much for your time.

-- 
Joshua Kordani
LSA Autonomy

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