[Libva] accessing buffer from vaCreateSurfaceFromCIFrame

[veerabhadra at indiatimes.com]

Hi,


I am writing camera applicationm, in which I want capture frame and apply my own image effects.
I am using vaCreateSurfaceFromCIFrame call to get surface id and I am able to render using vaPutSurface.


But if I want access the buffer to apply effect, I am trying get the buffer using vaMapBuffer but it hangs.

Here are the calls..


vaCreateSurfaceFromCIFrame ( va_dpy, frame_vf,&surface )
vaDeriveImage (va_dpy, surface, &image))
vaMapBuffer(va_dpy,image.buf,&coded_p);
write buffer to file
va_status =  vaUnmapBuffer(va_dpy,image.buf);
vaPutSurface(va_dpy, surface, win, 0,0, width, height, 0,0, win_width, win_height,

but this hangs...Please provide any pointers...

note: new to libva

rgds,
veer


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