[linux-dvb] Re: Clock synchronization

[Toby Jaffey <toby@earth.li>]

On Sat, Mar 02, 2002 at 11:01:26AM +0100, Ralph Metzler wrote:
> Toby Jaffey writes:
>  > Do the available DVB cards have voltage controlled 27mhz oscillators for
>  > this function or is it managed some other way?

> That's all controlled by the firmware on the card.
> The driver just selects the PID.

In the cards with a hardware decoder that makes sense. The decoder would
run at the speed dictated by the 27mhz VCXO. But, in the cheaper cards
which only do a demux then rely on software decoding, how does the
software decoder adjust it's speed accordingly? Is PCR recovery done by
the software decoder?

Is it just forced to repeat/skip frames to make up for the time
difference?

Or does the provided software decoder take a clock pulse from the DVB
card's VCXO to run by?

-- 
 ()=  | Toby Jaffey : pkl.net/~trj
//\   | "Women who seek to be equal with men lack ambition." -- Timothy Leary
v_/_  |                                                                      


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