sound: latency and synchronization measurements

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Hi All,

I am trying to characterize the audio synchronization between two
systems. There is a mechanism to route audio between two systems, we
run ‘aplay’ at one system and ‘arecord’ in other system.

We need to measure the time difference when audio sample is out at one
port and arriving at another port in different system.

I plan to add printk’s in “struct snd_pcm_ops” call backs, but does
these call backs tells when it received first and last audio

Or else please suggest any other best method.

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