[Libva] get the data from vaapi surface

[Sivaramkrishna Neeruganti]

Hi all,

I am trying to perform hardware accelerated decode of 720P h264 encoded
stream using Gstreamer Vaapi decode and Vaapisink plugins .I am using ATI
Radeon 5600 GPU .

My requirement is to get the image data from the Vaapi Surface after
decoding .I want to perform some operations on this image like scaling
,composing the two images .

As of now i tried to extract the image from the Vaapisurface by using the
functions in Gstreamer Vaapi library ,

image = gst_vaapi_surface_derive_
image(surf);

value = gst_vaapi_surface_get_image(surf,image);

the about functions were unsuccessful and i couldn't get the image data
from the Vaapi surface .

Is there any way i can perform scaling and composing directly on the Vaapi
surfaces without extracting the image data ?what do you suggest ,should i
use gstreamer vaapi plugins or libva API's directly to do the above
mentioned tasks ?if i can work using libva API's ,can anyone explain me how
to perform scaling and composing of two vaapi surfaces?

Any help is highly appreciated .

Thanks,
N Sivaramkrishna.
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