Em 20-04-2011 12:27, Stefan Ringel escreveu: > Am 20.04.2011 17:17, schrieb Mauro Carvalho Chehab: >> Em 20-04-2011 11:19, Stefan Ringel escreveu: >>> Am 20.04.2011 14:37, schrieb Mauro Carvalho Chehab: >>>> Em 20-04-2011 05:14, Stefan Ringel escreveu: >>>>> Am 19.04.2011 23:21, schrieb Mauro Carvalho Chehab: >>>>>> Em 04-04-2011 17:18, stefan.ringel@xxxxxxxx escreveu: >>>>>>> From: Stefan Ringel<stefan.ringel@xxxxxxxx> >>>>>>> >>>>>>> add mts parameter >>>>>> Stefan, >>>>>> >>>>>> The MTS config depends on the specific board design (generally present on >>>>>> mono NTSC cards). So, it should be inside the cards struct, and not >>>>>> provided as an userspace parameter. >>>>>> >>>>>> Mauro. >>>>> No. It wrong. I think edge board must work under all region and TV standards and if I set MTS, it doesn't work in Germany (PAL_BG and DVB-T). The best is to set outside region specific params. >>>> Stefan, >>>> >>>> Not all boards have MTS wired. >>> standard option that param is not auto. >>> MTS = 0 or not set means load firmware without MTS. >>> MTS = 1 means load firmware with MTS. >>> That means, if you MTS then add a param MTS=1. >>> Have you other method to detect norm BTSC and EIAJ and set it? I have not that. >> Yes. Audio standard is related to video standard. So, it is easy to map on what >> standards you have BTSC or EIAJ. >> >> You could find that info listed on some places, like: >> http://www.videouniversity.com/articles/world-wide-tv-standards >> http://en.wikipedia.org/wiki/BTSC >> and on good analog TV books. >> >> Basically, BTSC/EIAJ applies only to PAL/M, PAL/N and NTSC/M. So, if the standard is >> not PAL/MN, mts should always be equal to 0. We may have a patch at tuner-xc2028 for that. >> >> If standard is V4L_STD_MN, we have: >> >> For NTSC standards: >> if standard == V4L2_STD_NTSC_M_KR, audio is A2 (Korea) and mts should be 0. >> if standard == V4L2_STD_NTSC_M_JP, audio is EIAJ (Japan). >> All the rest use BTSC (or are mono, but the BTSC decoder is designed to be >> backward compatible with NTSC mono FM transmission). >> >> For PAL: >> V4L2_STD_PAL_M - always BTSC >> V4L2_STD_PAL_Nc (only Argentina) - always BTSC >> V4L2_STD_PAL_N (Paraguay/Uruguay) - they also use FM for audio. I think it is also BTSC. >> >> So, basically, assuming that some device could potentiallt have both SIF and MTS baseband >> wired and that the audio decoder is not capable of decoding EIAJ/BTSC, it makes sense to >> add something like this at tuner-xc2028: >> >> /* MTS is only valid for M/N standars, except in Korea */ >> if (!(std& V4L2_STD_MN) || (std == V4L2_STD_NTSC_M_KR)) >> mts = 0; >> >> and, for such device, specify xc2028 with mts = 1. >> >> For devices that support only mts, it makes sense to change the supported standards to >> just V4L2_STD_MN. >> >> However, we cannot assume that (std& V4L2_STD_MN)&& (std != V4L2_STD_NTSC_M_KR) is always >> mts, as it will depend on how xc2028/xc3028 is wired to the bridge/audio demod. >> > Is that better to use no mts parameter and always mts = 0? No. The better is to use a per-board mts parameter, as we have on all other drivers that use xc2028/xc3028. Mauro. -- To unsubscribe from this list: send the line "unsubscribe linux-media" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
