Am Montag, 7. M?rz 2005 22:18 schrieb Robert Schlabbach: > From: "Markus Schulz" <msc@xxxxxxxxxxxxx> > > > The packets are lost in dvb_dmx_swfilter_packets cause of sync byte > > (0x47) can't be found at next "Modulo 188" address and so the whole > > packet (next 188 bytes) are skipped. > > i've build some debug code to search from this position for sync > > byte and in my case the missing sync byte was everytime one byte > > behind original position and the packet from this position one byte > > to small (after 187 bytes the next sync byte is found). > > I have since bought a Cinergy 1200 DVB-C and wrote a Windows driver > for it and ran into the same thing. It appears to be a timing issue > between the demodulator and the SAA7146A (rather than a PCI DMA > issue): It looks as if sometimes the "SYNC" line goes high so early > that the SAA7146A latches in the last (check) byte of the previous > packet and subsequently is one byte off on every byte. > > Try this: Invert the polarity of the output clock with which the > SAA7146A latches in the bytes from the demodulator by _not_ setting > the POCLKP bit in the POLA1 register (change the third byte in the > third line of the init array from 0xa1 to 0xa0). This seems to cure > the issue in my Windows driver. > > Please let me know what your results are. works perfectly, no ts-packet loss anymore. big thanks. -- Markus Schulz
