> I have a board with 8 video inputs based on 1 bt848a. I am able to get
> video from the first input.
>
> I've hacked the bttv-cards.c and added this into bttv_tvcards list:
> name: "New Card (bt848a)",
> video_inputs: 8,
> audio_inputs: 0,
> tuner: -1,
> svhs: -1,
> gpiomask: 0,
> muxsel: { 0, 1, 2, 3, 4, 5, 6, 7 },
> audiomux: { 0 },
> needs_tvaudio: 0,
> pll: PLL_28,
> tuner_type: -1,
>
> I want to know how can I find out the correct values, like gpiomask and
> muxsel. Is there some documentation about this?
>
Don't know answer to your question, instead have another for you:
How to control the gain? In my 4-input card I managed to turn
AGC off, but after that the gain was in it's default value
(me thinks) resulting in an image all washed out. I checked
the Bt878 datasheet and it seems to have a pin or some pins
for external gain control voltage. So you need some off-chip
circuitry to be able to control gain, which most likely leads
to each manufacturer making it their own way. You do need manual
control if you're gonna use that 8-input card to rapidly switch
channels.
Jonk
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