README
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上传日期:2007-01-06
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- mgavideo README
- Copyright (C) 1999 Ryan Drake (stiletto@mediaone.net) See COPYING.
- Generic all-caps "cover my ass" statement:
- ------------------------------------------
- ************************************************************************
- THIS RELEASE IS FOR SERIOUS KERNEL HACKERS ONLY. IT IS NOT INTENDED FOR
- EVERYDAY USERS. THIS IS NOT BETA CODE. THIS IS NOT EVEN ALPHA CODE.
- IT IS AN EXPERIMENTAL DEVICE DRIVER, SO HANDLE IT WITH CARE. IF YOU
- DON'T KNOW WHAT YOU ARE DOING YOU SHOULDN'T BE USING THIS YET.
- ************************************************************************
- Once it is more stable, and I am sure it won't blow up anyone's computer,
- I will make a more public release, but for now, use it at your own risk.
- New from last release:
- ----------------------
- Read the CHANGELOG.
- Read apps/appsreadme.txt <--------- (please do this!)
- Some new apps. One to change the tv channel and one to turn preview
- window on and off. Read apps/appsreadme.txt
- insmod parameter for setting your video memory size. Hopefully this
- will help the driver play nice at high resolutions/color depths.
- Support for setting contrast, brightness and hue--saturation is next.
- Backend scaler colorkeying support added. I've turned off normal
- non-colorkeying overlay, but eventually we will support both and glue
- it to v4l2.
- NOTE! - I have only tested this in the following environment:
- Desktop resolution: 1024x768x16bit
- Briefly tested in: 32bit
- Video card: Matrox Marvel 8MB
- Video input: Composite line-in, and TV Tuner
- Video format: NTSC
- I'd love to hear from people who have gotten this working
- on other configurations, but I doubt it will "just work" at
- this stage in the game.
- What you get in this tarball:
- -----------------------------
- mgavideo.c - this module is the interface to the G100 and G200's video
- mgavideo.h - extension registers. It also registers itself as an i2c
- bus, and includes an api for sending commands to each
- of the devices on the i2c (currently there is support
- for the ks0127, the msp3400, and the TV tuner).
- ks0127.c - this module is an interface to the KS0127 video decoder
- ks0127.h - chip, which is used on the Matrox Rainbow Runner-G series
- cards, and the Matrox Marvel card.
- maven.c - Skeleton driver for the Maven TV-out. Currently does
- maven.h - nothing but detect the chip.
- i2c.c - These files are all from the Linux 2.2.7 kernel. They
- tuner.h - will compile and work fine, as long as you have a 2.2
- msp3400.h - version of the kernel installed with the ORIGINAL FILES.
- - More on this below...
-
- i2c.h - These files were also taken from the Linux 2.2.7 kernel.
- tuner.c - They needed to be patched to support the Matrox cards.
- msp3400.c - Hopefully I can get the patched versions back into the
- kernel.
- videodev2.h- I've just gone and renamed the videodev.h from V4L2 to
- this, so not to confuse the drivers that still need
- V4L1's videodev.h.
- v4l2cap.c - Video4Linux2 interface to this driver. This need a lot
- of work, but for now it works OK.
-
- i, r - Two very simple shell scripts I cooked up to easily
- install and remove the drivers. You can probably guess
- which one is which.
- Makefile - you know what this is for
- apps/* - Sample V4L2 apps.
- So how do I build this thing:
- -----------------------------
- Make sure you have the Linux kernel source installed. You need this.
- I've tested it on 2.2.7, but it should work for all versions 2.0 and
- above. If it doesn't I'd like to know.
- Run make:
- make
- As root, run my "i" script, or insmod them yourself if my script
- doesn't work, or if you don't trust it :)
- ./i
- Back as a normal user, run the xcaptest that was just built. Other
- versions of xcaptest wont work so make sure you get the right one:
- ./xcaptest
- A strange bug I just recently started seeing. Sometimes it won't
- work the first time you load the modules. I don't know why.
- The solution is to unload the modules:
- ./r
- And then reload them. That should fix it.
- If things don't work, it may be helpful to open up an xconsole and
- have a look at what's going on. All of the driver .c files have
- a line int debug = 0; And if you change any of these to = 1, you
- can get even more debug information.
- Again, this stuff could mess up your card if it doesn't work right
- so make sure you know what you're doing before running them.
- What needs to be done:
- ----------------------
- APPS NEEDED! If you are a bored hacker trying to think of a cool
- project, we could use a nice V4L2-capable video displayer that
- supports capture, preview, TV tuner (including channel changes.. see
- freq.c) ... all that good stuff. Something with a nice shiny GTK+
- GUI or whatever would be ideal! I know this is just wishful thinking
- but I'll put the request out for the record ;-)
- Implement other V4L2 devices. V4L2 can interface to other kinds of
- devices besides video. From what I can tell, we can probably implement
- /dev/codec, /dev/vout, /dev/radio, and /dev/vbi, in addition to the
- currently implemented /dev/video.
- Work on Maven support. Any volunteers?
-
- Extra:
- ------
- Anyone know if the Maven TVOut spec is available anywhere?
- The mgavideo module contains basic code to set up the video capture
- and vbi windows, and to start and stop the grabber. Matrox has
- released specs for the G200 chip, which you can get here:
- http://www.matrox.com/mga/dev_relations/chips_tech/mga-g200.htm
- You need to register to get the specs, and it doesn't cost anything
- to get them.
- The KS0127 module works, but will need more features implemented
- in order to be very useful. Specs for this chip can be found here:
- http://www.usa.samsungsemi.com/products/prodspec/videodecoder/KS0127/ks0127ov.htm
- Ryan Drake
- stiletto@mediaone.net