[Libav-user] hw_decode.c example, help getting cuda decoded frame into application cuda memory

[Cole Richardson]

Hello,

I have been using the libav* libraries c-api here recently and it's been a
blast!

I am currently working with the ffmpeg example hw_decode.c (targeting only
cuda decoder for now) and I would like to get the hw decoded frame into my
own cuda allocated memory instead of copying to the cpu and writing to disk
as is done in the example:
https://github.com/FFmpeg/FFmpeg/blob/ab37c7e49ff98a8c32c90e6df49dd11145bc64bb/doc/examples/hw_decode.c#L108.
Additionally, I would like this frame to be in RGB colorspace.

My questions are:

   1. How can I copy the hw (NV12 format) frame into my own cuda memory
   (cudaMalloc from cuda_runtime.h)?
   2. How can I do the colorspace conversion? Is there a way to do this
   with libav* libraries prior to copying into my application memory? If not,
   I could probably write my own cuda kernel or something.

Any info would be greatly appreciated!

Thank you,
- Cole
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