I've looked at this fairly extensively now, the primary issue is the ALSA driver, it does not support 192 (or 176). The S/PDIF data stream comes directly out of the processor which contains a bunch of registers which affect the output sample rate. Its not just an issue of sticking "192" in a register. There are a whole pile of parameters which have to be set correctly in order for it to work. Example are: clock select, prescaling, buffer size, interrupt frequency, a whole bunch of others I don't remember. Last time I looked it was not obvious what some of these paramters needed to be. It would take some time to figure all that out and do a bunch of trials to get that working.
Then there is distribution, this is code that is compiled into the kernel, not something you can just change a number, its pretty much something you would have to convince logitech to change, they have not been hot on kernel changes at this point. So even if someone comes up with the code change for the ALSA driver, you would have to convince logitech to make that change. So yes it is theoretically possible, but it will take a significant amount of work to implement and logitech has to bless it and include it in the firmware. The probability of this happening is pretty low, you would have to get an awful lot of support for this to convince logitech its something that needs to be done. There is another fly in the ointment at this point, the current crop of TOSLINK receivers are NOT fast enough to reliably support 192, so very few if any DACs support 192 over TOSLINK. There is no way for the Touch to know whether you are connecting via coax or optical. If the driver gets updated to 192, and you use optical connection to the DAC, then you won't won't get sound at all, no message from the Touch, it's happily sending 192 over the link but the DAC can't read it. Logitech is a bit reluctant to put out a system that works this way. Many of the DAC manufacturers that support 192 go to great lengths to market their DACs as being 192 capable, but don't make clear that it won't do that over TOSLINK. Logitech would then have to deal with all the upset poeple who bought a 192 DAC, and the Touch says it supports 192, but when they hook them up it doesn't work. They are a little reluctant to be in that situation. John S. -- JohnSwenson ------------------------------------------------------------------------ JohnSwenson's Profile: http://forums.slimdevices.com/member.php?userid=5974 View this thread: http://forums.slimdevices.com/showthread.php?t=92823 _______________________________________________ Touch mailing list [email protected] http://lists.slimdevices.com/mailman/listinfo/touch
