Re: [V4L] ATI TV Wonder - Sound from non-TV interfaces

[James MacLean <macleajb@xxxxxxxxxxx>]

On 10 Dec 2000, Gerd Knorr wrote:
> > I have breifly read Alan's V4L 1 specs and sparcely read over the
> > bttv-driver.c and msp3400.c files from 0.7.50. I am only guessing that
> > the msp needs to know to switch to a different input?
> Might be, depends on how the card is designed.  One possible way is to
> route the external jack throuth the msp34xx's scart input.  Another is
> to connect an audio mux to some of the GPIO pins of the bt848/878 chip.
> > But how is that signalled?
> AUDC_SET_INPUT
>   Gerd

Thanks for the pointers Gerd. I looked at AUDC_SET_INPUT in msp3400.c and
see it being called sometimes (sometimes not because of MUTE being set in
bttv-driver.c so it is not called) to switch to AUDIO_EXTERN. But that
does not seem to do it, even when it _is_ called. So I played substitute
and tried IN1-4 in scarts array 0 and IN1 in array 1. All these within the
msp_command fnx when AUDIO_EXTERN was called. Nothing would stop the TV
channel from being transmitted :(.

So would this suggest it is possibly setup as your second thought above?
That it may connect the audio mux to some of the GPIO pins of the
bt848/878 chip? If so, where would you suggest I be looking for that? Or
is it even possible in the current drivers?

thanks,
JES
--
James B. MacLean        macleajb@xxxxxxxxxxx
Department of Education http://www.ednet.ns.ca/~macleajb
Nova Scotia, Canada
B3M 4B2