the description of pa_buffer_attr at http://freedesktop.org/software/pulseaudio/doxygen/structpa__buffer__attr.html#details is missing unit for maxlength; one can only guess from the other struct elements that maxlength is probably in bytes (could also be frames, usecs, etc.)
Fixed in http://cgit.freedesktop.org/pulseaudio/pulseaudio/commit/?id=564997e4874a659bbd52a069d94fe981075dd1b7
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