Playback at a desired time on Intel HDA, is it possible ?

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Hello,

Greetings !

I am working on Intel HDA out of SkyLake platform.
I am looking to play audio samples at a desired time on the sound
card's clock and would like to know if this is possible.

To accomplish this, I need to ...

1.Query the current time on the sound card's clock (to add an offset
to it and compute the desired playback time)
2.Specify the "desired" time somehow to the sound card

Are the above two possible ?

Also, I cam across this on the ALSA page ...
"The link time can be directly measured if supported in hardware by
sample counters or wallclocks (e.g. with HDAudio 24MHz or PTP clock
for networked solutions)"

Are there sound cards that can latch on to a PTP clock on a NIC or
what is the connection between PTP clock and sound card, please
educate ?

Thanks in advance.

Regards,
Rajagopal


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