We do query native sample rate?

https://cs.chromium.org/chromium/src/media/audio/pulse/audio_manager_pulse.cc?l=164

Right, I should rather say that it queries the same parameters regardless of which device is used. (It's also not really clear to me from the PA documentation that the "server default" is the same as the native parameters of the default sink, though that would be very resonable).

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maxmorin@ for triage, routing, or an update. Thanks. 

Max, given the age, would it be OK to close the issue as "Won't fix"?

Oskar: Is this something your team would like to do? We'd get rid of some resampling and there's also a fifo in our code which could be eliminated. Otherwise, please won'tfix this one.

I can take a look and see if the format in PulseAudio is actually device-specific, or if it's a single, shared format regardless of device used. My hunch is that it's the latter.  

As mentioned in #1, there's pa_context_get_sink_info_by_name to get information by sink. You can also check it in the terminal by "pacmd list-sinks" (under "sample spec").