[vlc-devel] How to parse MPEG-2 or MPEG-4 stream to get "layers"

[Alvin Chin]

I know that MPEG-2 allows you to encode in layers using MPEG-2 
scalability and MPEG-4 can encode layers using FGS, but I am wondering 
how I can read that information so that I can just send only those 
layers to the client.  In other words, create a progressive streaming 
media video that just retrieves the base layer and then the user can 
request enhancements of the video by getting other layers. 

I am trying to read the source code and the API documentation, but I am 
kind of lost as to where to read.  I think I have to parse the MPEG 
header.  I know that the stream description can be viewed as a tree but 
where can I access that tree?

If anyone has any suggestions on how to do this, it would be greatly 
appreciated.

Thanks.

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