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That tries to both set the buffersize and the samplerate of the graph.
Document them in README.md
Also add the same env variables to pw-stream and pw-filter.

Peter Hutterer authored Sep 10, 2021 and Wim Taymans committed Sep 10, 2021

Allow one of "XEWIDT" to refer to none, errors, warnings, info, debug
and trace, respectively because they're immediately recognizable. Well,
except maybe the X.

PIPEWIRE_DEBUG="I" is equivalent to PIPEWIRE_DEBUG="3" for example.

fixes #1174

Logging to journald can be annoying at high debug levels, so add an easy
way to disable it.