[Libva] libva introductory article for newbies?

[Xiang, Haihao]

On Tue, 2013-02-05 at 23:41 +0400, Ibragimov Rinat wrote: 
> Hi,
> 
> During making attempts to use VAAPI I faced with couple of difficulties
> and then realized I have no high-level understanding of how it should
> be used. Philosophy of libva, if you like. Is there exists some
> introductory article about?

You can build the documentation which contains some pseudo code.

> 
> I don't understand why in i965 driver vaQueryImageFormats returns formats
> in YUV-colorspace only (YV12, I420, NV12) but vaCreateImage have some code
> with BGRA too. 

The image formats returned from vaQuerySubpictureFormats() are valid to
vaCreateImage()


> Is it allowed to create BGRA images? And so on. I tried to
> search the web but failed to find answers. Code I found uses YV12 formats,
> but I need to cope with RGB.
> 
> --
> Rinat
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