[mythtv] HWSlice fixes (was dvb fixes)

[Joe Tapply]

Hi Ivor - looks like you've just reworked the EPIA-M patch I
submitted a few months ago! I am just glad the fix is finally
in CVS - my MTBF was about 5 mins without it.

What are you doing when slices go missing? If mid-frame slices
vanish, you can obviously just process the number you've counted once
slice 36 appears, but I certainly saw cases when slice number 36 would
be lost. In the end I think I just flushed frames to the H/W whenever
it looked liked we should have seen a whole frame - i.e. on seeing 36
in the slice header, or seeing say 33 followed by 2 etc. Hope that helps -
though you've probably got a better solution anyway!

Cheers,
      Joe.

-----Original Message-----
From: mythtv-dev-bounces at mythtv.org
[mailto:mythtv-dev-bounces at mythtv.org]On Behalf Of Ivor Hewitt
Sent: 23 December 2003 09:50
To: mythtv-dev at mythtv.org
Subject: Re: [mythtv] HWSlice fixes (was dvb fixes)


On Tuesday 23 December 2003 00:08, Kenneth Aafløy wrote:
> Are you saying that VIA_decode_slice could receive multiple
> slices in the same data buffer?

No its' that its not receiving some slices for a frame in the data buffer,
but
VIASliceReceiveData is still being told it's being sent 36 slices.

> Or that you are just counting the slices yourself, not
> relying on the value provided?

The 'value provided' was curdata->maxcode, so always 36. So yes, I'm now
counting them myself.

> I guess that libav(codec|frame) is only passing along what
> ever it can figure out from the stream it receives. Looking
> at mpeg12.c after the call to VIA_decode_slice, and it looks
> like it does some checking for invalid slice order. Based on
> this I would assume that the responsibility for handling
> these cases are put upon VIA_decode_slice.

Thanks, I'll look through that today and try to produce a 'nice fix'.

--
Ivor Hewitt.
http://www.ivor.it - Wireless networking and techie bits.
http://www.ivor.org - The leylandii hedge pages

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