Le samedi 19 mai 2012 21:36:23 Antti Palosaari, vous avez écrit : > On 19.05.2012 21:20, Hans de Goede wrote: > > Currently the V4L2 API does not allow for radio devices with more then 1 > > tuner, > > which is a bit of a historical oversight, since many radio devices have 2 > > tuners/demodulators 1 for FM and one for AM. Trying to model this as 1 > > tuner > > really does not work well, as they have 2 completely separate frequency > > bands > > they handle, as well as different properties (the FM part usually is > > stereo capable, the AM part is not). > > > > It is important to realize here that usually the AM/FM tuners are part > > of 1 chip, and often have only 1 frequency register which is used in > > both AM/FM modes. IOW it more or less is one tuner, but with 2 modes, > > and from a V4L2 API pov these modes are best modeled as 2 tuners. > > This is at least true for the radio-cadet card and the tea575x, > > which are the only 2 AM capable radio devices we currently know about. > > For DVB API we changed just opposite direction - from multi-frontend to > single-frontend. I think one device per one standard is good choice. If I understand Hans correctly, he suggests to use two tuners on a *single* radio device node, much like a single video device nodes can have multiple video inputs. So I think you agree with Hans, and so do I. -- Rémi Denis-Courmont http://www.remlab.net/ http://fi.linkedin.com/in/remidenis -- 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
