Em Tue, 14 Jan 2014 17:16:10 +0200 Georgi Chorbadzhiyski <gf@xxxxxxxxxxx> escreveu: > Hi guys, I'm confused the documentation on: > > http://linuxtv.org/downloads/v4l-dvb-apis/frontend_fcalls.html#FE_READ_SNR > http://linuxtv.org/downloads/v4l-dvb-apis/frontend_fcalls.html#FE_READ_SIGNAL_STRENGTH > > states that these ioctls return int16_t values but frontend.h states: > > https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/tree/include/uapi/linux/dvb/frontend.h > > #define FE_READ_SIGNAL_STRENGTH _IOR('o', 71, __u16) > #define FE_READ_SNR _IOR('o', 72, __u16) > > So which one is true? Documentation is wrong. The returned values are unsigned. Would you mind send us a patch fixing it? Btw, the better is to use the new statistics API, when it is available: http://linuxtv.org/downloads/v4l-dvb-apis/FE_GET_SET_PROPERTY.html#frontend-stat-properties As it properly specifies the scale of each value. If you're working in userspace, the libdvbv5 has functions that use the new API automatically when the DVBv5 statistics are available on a DVB driver, via dvb_fe_retrieve_stats(): http://git.linuxtv.org/v4l-utils.git/blob/HEAD:/lib/include/dvb-fe.h -- Cheers, 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
