[Libva] API changes

[Xiang, Haihao]

On Sun, 2013-01-13 at 20:38 -0800, Ratin wrote: 
> Hi, I have noticed that since september / octorber of 2012, VAAPI
> structs, signatures changed  so much that I had to throw out all my
> decode/rendering code that I previously wrote and basically start
> writing from scratch again.

The official release has stable APIs. You are using staging branch,
right ? The staging branch is created for new features, so some of the
APIs for new features aren't stable enough. 

> For example, the changes in test program avcenc is drastic. I was just
> curious how often do you make these kind of core API changes? Is it
> possible to follow some basic programming standards like, don't change
> the signature drastically, use structs for signatures so its only
> elements within strucs that changes, and also call version 2 of the
> function from within function 1 internally , dont change version 1's
> signature ..  etc?   
> 
> 
> Thanks
> 
> 
> Ratin
> 
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