pippin wrote: > . > I didn't know DoP was a dedicated USB transfer mode to be selected, I > was somehow under the impression that DoP uses normal PCM formats (and > announced the stream as such) and that a DoP-capable DAC will identify > it as DoP based on the upper 8 bit in the samples, the ones being used > not for audio data but as DSD markers. > > That's also what this specification says: > http://dsd-guide.com/dop-open-standard#.WLMnJhI18UE > > It states that the output is sent as PCM raw and that the lower bits are > being used as markers. > It also specifically states that this was done this way because Apple > doesn't allow selection of a DSD mode on the USB bus. > > > Yes, sure. It was just that the DoP specification above specifically > claimed it's different and that the markers and only the markers are > being used to identify the stream as DSD. >
I think both is true, all formats are DSD over PCM, but DOP is a special one and uses marker (first byte) on every frame. 'Sniffing' for DOP marker, you could detect is DSD and not PCM at any point in the stream, so it's correct they want you to use this method, also becouse you must trow away the marker from data. What you mean with "selection of a DSD mode on the USB bus"? No USB BUS can transfer DSD (bitstream), in any system. It should be packed someway, that's what 'native' formats does and for what i know, should work also in mac OsX with ASIO drivers, just becouse - as is per DOP - from the USB BUS point of view is always PCM. But this last point is not so clear to me and is "under investigation". ____________________________________________________________ SB+, Klimo Merlino + Kent Gold, Monitor Audio Studio 20 Gold SE+, Klimo reference and DIS Interconnect. ------------------------------------------------------------------------ marcoc1712's Profile: http://forums.slimdevices.com/member.php?userid=34842 View this thread: http://forums.slimdevices.com/showthread.php?t=106956 _______________________________________________ Squeezecenter mailing list [email protected] http://lists.slimdevices.com/mailman/listinfo/squeezecenter
