[Kwintv] V4L plugin status

[George Staikos]

The V4L plugin is coming along nicely.  The status is as follows:

- Default method: use overlay if possible, else fall back to grab+display with 
Xv (hardcoded - will change)
- Grab + Display - should work with minor bugs.
- Overlay should work in NTSC, PAL, SECAM.  Audio should work basically.  
- Overlay does not have any clipping support yet, leaves artifacts all over, 
and only captures at max res (which is the wrong res for NTSC too)
- Overlay only supports displays using RGB32, RGB24, RGB565 or RGB555 at best.  
I have only tested RGB565.
- Channel changing should work fine.
- Grabbing works in mmap mode if possible, otherwise falls back to read().  
This means it should work with web cams and video.
- Grab+Display is hardcoded to YUV right now.
- Xinerama support needs some work.


How to test:
- build and install qtvision (latest version!)
- cd qtvision/plugins/video/v4l/
- make install


Test reports (keeping in mind that the code is incomplete) are appreciated.

-- 

George Staikos