EVL: CLOCK_MONOTONIC_RAW

Hello,

I have some problems with audio synchronization algorithms running in a real-time EVL thread when using NTP at the same time in other inband threads, because they use an EVL_CLOCK_MONOTONIC clock to measure time differences and to implement internal time corrections (in nanoseconds resolution).

I think the reason is because EVL_CLOCK_MONOTONIC is based in the CLOCK_MONOTONIC linux clock (ktime_get() kernel call), and it's known that it suffers from NTP frequency adjustments:

        CLOCK_MONOTONIC never experiences discontinuities due to NTP time adjustments, but it does change in frequency as NTP learns what error exists between the local oscillator and the upstream servers.

In Linux, typical audio synchronization algorithms recommend to use the CLOCK_MONOTONIC_RAW instead (ktime_get_raw() kernel call):

        CLOCK_MONOTONIC_RAW is simply the local oscillator, not disciplined by NTP. This could be very useful if you want to implement some other time synchronization algorithm against a clock which is not fighting you due to NTP.

However, EVL doesn't have an EVL_CLOCK_MONOTONIC_RAW clock available in an out-of-band context.

Could you please add a new EVL_CLOCK_MONOTONIC_RAW to EVL in order to get the correct behavior on these scenarios?

Best regard

---
Jesus.

Jesus Villena
Software Engineer
607198846       / 3025

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