Add support for NVDEC (aka CUVID or CUDA) decoding using NVidia GPU through FFmpeg

[Peter Bennett]

VDPAU does not support video that is bigger than 1920x1080. VDPAU is not being updated.

NVDEC is a new API for accessing the GPU of NVidia devices.

[bjoernv]

Unfortunately H265/HEVC videos currently do not play with VDPAU playback profiles (tested with v30-Pre-1011-g7d6974a9b6, see ​https://pastebin.com/DYxWELE9). This worked with MythTV 29. A fix for VDPAU or NVDEC is very welcome.

[Peter Bennett]

Add support for nvdec decode and deinterlace

[Peter Bennett]

This patch adds the ability to decode and deinterlace using NVDEC with the NVidia GPU. At this level it is rather useless because the frames are still brought into main memory and then put back out to the GPU for display. With all the moving around of frames this is slower than using software decode. The next step is to add the direct transfer from decoder to OpenGL without going through system memory. I am looking at this but I may need some assistance from somebody who knows OpenGL.

With this patch it is not possible to change deinterlace methods on the fly, as deinterlace has to be set up before opening the decoder. Implementing change of deinterlace on the fly will require re-instantiating the decoder when changing deinterlace method.

[Peter Bennett <pbennett@…>]

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