Update v4l2m2m interface & create videoio.h

[shizhenghui]

Update v4l2m2m interface & create videoio.h

1. Copy part of linux videodev2.h which is used in v4l2m2m
2. Move userspace interface from nuttx/video/video.h to include/sys/videoio.h

Impact

N/A

Testing

CI

[acassis]

@shizhenghui what is the purpose of this command:

ffmpeg -vcodec h264_v4l2m2m -i /stream/333.mp4 -pix_fmt rgb32 -f fbdev /dev/fb0

I assume it is only used on Linux side, since we don't have ffmpeg ported.

Please include more information and documentation about how to use video support on NuttX

[xiaoxiang781216]

@shizhenghui what is the purpose of this command:

ffmpeg -vcodec h264_v4l2m2m -i /stream/333.mp4 -pix_fmt rgb32 -f fbdev /dev/fb0

I assume it is only used on Linux side, since we don't have ffmpeg ported.

Xiaomi made a porting two years ago.

Please include more information and documentation about how to use video support on NuttX

this is the first step, m2m driver and documentation will provide in the next step.

[shizhenghui]

@shizhenghui what is the purpose of this command:

ffmpeg -vcodec h264_v4l2m2m -i /stream/333.mp4 -pix_fmt rgb32 -f fbdev /dev/fb0

I assume it is only used on Linux side, since we don't have ffmpeg ported.

Please include more information and documentation about how to use video support on NuttX

@acassis Sorry for the trouble caused by the previous message. I have removed the ffmpeg command. After updating the m2m driver, I will provide an update on how to use v4l2m2m.

[acassis]

@xiaoxiang781216 is it possible to submit the ffmpeg port to mainline or we need to wait for h264_v4l2m2m support first?

[xiaoxiang781216]

@xiaoxiang781216 is it possible to submit the ffmpeg port to mainline or we need to wait for h264_v4l2m2m support first?

it will open source publicly within 6 months.