Dear Ross, all,
did somebody wrote the StreamDuplication class you proposed below already?
Do you have a hint how the getNextFrame functions could be synchronized?
Thank you very much,
Bernhard
----- Original Message -----
From: "Ross Finlayson" <[EMAIL PROTECTED]>
To: "LIVE555 Streaming Media - development & use"
<[EMAIL PROTECTED]>
Sent: Thursday, December 08, 2005 8:57 PM
Subject: Re: [Live-devel] Media stream duplication on a streaming relay
As you noticed, you can't duplicate a stream by having each recipient read
from a single object, because "getNextFrame()" can't be called more than
once on the same object concurrently.
The solution, instead, is to create a separate object (of some
"FramedSource" subclass) for each recipient. This new class would
implement the "doGetNextFrame()" virtual function by somehow 'registering'
with the data source object - to request a copy of the next incoming
frame.
The data source object (which would *not* be a subclass of "FramedSource",
and so would not implement "doGetNextFrame()") would handle these requests
by delivering copies of each incoming frame to each recipient, and not ask
for a new incoming frame (from its upstream data source) until it has
finished delivering data to each downstream recipient.
For an example of code that is similar to this, note the relationship
between the "MPEG1or2Demux" and "MPEG1or2DemuxedElementaryStream" classes.
(In this case, however, we are demultiplexing data to downstream
recipients, rather than duplicating it.) Note in particular that (i)
"MPEG1or2Demux" is subclassed from "Medium", not "FramedSource", and (ii)
"MPEG1or2Demux" implements a "getNextFrame()" function that is similar to,
but different from "FramedSource::getNextFrame()".
(This functionality (data duplication) is something that should probably
be added to the library someday. Until then, however, you will need to
implement it yourself.)
Ross Finlayson
Live Networks, Inc. (LIVE555.COM)
<http://www.live555.com/>
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