[linux-dvb] Re: hw_sections=0 causes disrupted recordings

[Johannes Stezenbach <js@convergence.de>]

Klaus Schmidinger wrote:
> I'd like to point to my posting from yesterday (see
> http://linuxtv.org/mailinglists/linux-dvb/2003/06-2003/msg00218.html).
> 
> Maybe somebody with deeper knowledge about this can look into this
> and tell us whether there actually is something wrong in the driver
> in case of hw_sections=0?

You wrote there and then:
> I looked a little deeper into this and found that in StartHWFilter()
> the 'mode' is initialized to 0xb96a, which is the value necessary to
> allow simultaneous recording and replay. In case of DMX_TYPE_SEC and
> hw_sections=1, this will be overwritten with mode=4. So I guess the
> root of the problem is that in case of hw_sections=0 'mode' remains at
> 0xb96a, which I assume causes the section data to be transferred via
> the same channels as TS data and thus results in disrupted recordings.

That's the intended behaviour. Mode=4 -> use HW filters,
mode=0xb96a -> pass TS packet to SW filter (BTW, I hate magic numbers).
And yes, that means that high bandwidth section data has the same channel
and priority as AV data. But even pay TV EPG data is relatively low bandwidth
compared to video, so I see no problem.


Johannes


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