[MPlayer-dev-eng] [PATCH] vo_kva

[Reimar Döffinger]

On Thu, Feb 26, 2009 at 01:18:15AM +0900, KO Myung-Hun wrote:
> flip_page() transfers the contents of the frame of the internal buffer 
> to the video buffer allocated by video hw and displays them. But 
> draw_slice() copys the contents to the internal buffer.
> 
> And as you see, kvaLockBuffer() allocate a video buffer and 
> kvaUnlockBuffer() display the contents of the video buffer. So I cannot 
> use a video buffer in draw_slice().

You can call kvaLockBuffer during VOCTRL_START_SLICE (or draw_frame)
and call kvaUnlockBuffer in flip_page.
Gets rid of the internal buffer, should be a lot faster, and displays
the video much closer to the right moment.
While that it is quite contrary to common sense to keep something locked
for such a long time, this seems to be the way that kva (and some other
OS/2 video interfaces) was designed.