[mythtv] DVB, HD-2000, and CRCs
Doug Larrick
doug at ties.org
Tue Mar 22 03:16:18 UTC 2005
Taylor Jacob wrote:
> If you look at the dvb driver API and the code in question, you will see that
> the demux driver does section reassembly in software and or hardware (depending
> on if your transport ic can do it in hardware or not). It is ONLY for section
> data the dvb driver does CRC validation.. This is a reasonable thing so CRC
> checking does not need to be implimented in every application..
Looking at the driver source, I concur... it should be checking CRC for
section data (metadata, not video/audio streams). Nevertheless, with
the HD-2000 DVB driver at least, it is not. I've verified that the
DMX_CHECK_CRC flag is being set on the filter.
I hacked in a call to mpegts_crc32 for EIT and ETT PIDs, and am now not
seeing the errors I was seeing before. A quick inspection of the
HD-2000 driver did not reveal a bug in this area, but I suspect that's
where it is.
-Doug
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