On Mon, 13 Jun 2016 21:51:36 +0200 Richard Cochran <richardcochran@xxxxxxxxx> wrote: > On Mon, Jun 13, 2016 at 01:47:13PM +0200, Richard Cochran wrote: > > 3. ALSA support for tunable AD/DA clocks. The rate of the Listener's > > DA clock must match that of the Talker and the other Listeners. > > Either you adjust it in HW using a VCO or similar, or you do > > adaptive sample rate conversion in the application. (And that is > > another reason for *not* having a shared kernel buffer.) For the > > Talker, either you adjust the AD clock to match the PTP time, or > > you measure the frequency offset. > > Actually, we already have support for tunable clock-like HW elements, > namely the dynamic posix clock API. It is trivial to write a driver > for VCO or the like. I am just not too familiar with the latest high > end audio devices. Why high end ? Even the most basic USB audio is frame based and isosynchronous to the USB clock. It also reports back the delay properties. Alan -- 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
