[vdr] Re: PATCHES: vdr-1.2.6 (getSTC and mp2)

[Sven Goethel <sgoethel@jausoft.com>]

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On Friday 07 November 2003 15:04, Klaus Schmidinger wrote:
> Johannes Stezenbach wrote:
> > (Sorry, can't Cc: vdr@linuxtv.org because I'm not subscribed.)
> >
> > Klaus Schmidinger wrote:
> > > While testing the GetSTC function in VDR I saw that the value
> > > happily continues to count upwards even if I pause a replay.
> > > As soon as I continue replay the counter jumps back to where
> > > it was when Pause was pressed.
> > >
> > > @Johannes: shouldn't the DMX_GET_STC call return a constant value
> > >            while in pause mode?
> >
> > That's not the way the hardware works. The STC is fed by a 27Mhz
> > crystal, and synced to the PCR by reloading the STC when the
> > PCR/STC difference is too high and otherwise modulating the
> > 27Mhz frequency by some control output (usually a PWM signal)
> > which is set by a software implemented PLL. It's implemented
> > this way across all the hardwares I know, only the parameters
> > for the software PLL may differ. (It's pretty much specified
> > like that in iso13818-1.) If no new PCRs arrive the STC is free
> > running.
> >
> > If you do trick modes, don't look at the STC.
> >
> > Well, one could handle PAUSE in the driver by returning
> > the last STC value from just before the PAUSE for
> > DMX_GET_STC, but that's not implemented.
> >
> > Johannes
>
> Well, it's not really a problem, since the player knows when it's
> in pause mode. Just thought I'd mention it. If this is how it's
> supposed to be, that's just fine with me...
>
> Klaus

thanx a lot for this information

so .. STC is valid in play mode

sven
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