[0.5] rfc video type

Some thoughts about the video link type in gephex 0.5.

Limits:

- only rectangular screens
- only progressive scan (no interlaced modes)
- only constant frame rates
- only one frame in one video link


Requirements:

- 4:3 and 16:9 screen aspect ratio
- rgb color model
- alpha channel
- common broadcast and computer resolutions
4:3: 320x240, 640x480, 800x600, 1024x768
16:9: 1280x720, 1920X1080
- alignment for pixels (32 bit)
- alignment for scan lines (128 bit)
- 8 bit resolution per channel
- must support frei0r framebuffer layout without conversion


Open issues:

- Should we support formats with a pixel aspect != 1:1 ?
DV PAL e.g. has a resolution of 720 x 576 and aspect ratio of 4:3

- optional yuv color space

- Subimages

- optional monochrome and binary images

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