notify the thread that work is to be done

stop the thread (at least on Destruction)

try to get the process pointer, return false when thread is busy

wait for the processed data from the thread, in worst case this may fail when to much time expires (5 * timeOut time) to avoid Xruns or dead looks. re

retrieve file path from state

set a name for the thread (may help on diagnostics)

set the time out for the thread waiting functions in milliseconds

write file path to state

copied gcd from (zita) resampler.cc to get ratio_a and ratio_b for calculate the correct buffer size resulting from resample

set thread policy and priority class, this may fail silent

start the new thread

clean up

send a file name from GUI to the engine

send value changes from GUI to the engine