On Mon, Jun 13, 2016 at 01:47:13PM +0200, Richard Cochran wrote:
- 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.
I have seen audio PLL/multiplier chips that will take, for example, a 10 kHz input and produce your 48 kHz media clock. With the right HW design, you can tell your PTP Hardware Clock to produce a 10000 PPS, and you will have a synchronized AVB endpoint. The software is all there already. Somebody should tell the ALSA guys about it.
I don't know if ALSA has anything for sample rate conversion or not, but haven't seen anything that addresses distributed synchronized audio applications.
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