Run-time hw_params for slave in external filter plugin SDK

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Hello

I'm writing plugin with external filter plugin SDK,
they make some manipulation on received samples.
I want to set slave  channels and slave format depending on parameters of input pcm.
Is this possible?
I can set they static with snd_pcm_extplug_set_*
Maybe for this i must use hw_params and init  callbacks, but i not understand how

Thanks


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