Implemented caching signals to prevent not generated sound in case of… #3518
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… framesBuff from PortAudio is too small
If we don't specify framesPerBuffer parameter in Pa_OpenStream, PortAudio will choose optimal value for particular callback call. It can vary from run to run even on the same hardware depending on available system resources.
While generating signal, interpolating and applying effects, we assume that framesBuffer contains more than minimal number of frames to generate envelope. BTW, it is not true. If framesBuffer is smaller, algos cannot generate correct sound and just keep silence.
I've implemented cache which keeps generated values from dsp algorithms and applies it step-by-step to buffer values from pa_callback. Cache is filled each time algos generate dsp values. If buffer frames are not enough to generate envelope, algos generate values for further calls and keep it in cache.
Required number of frames has been selected as a number of frames for one phase multiplying by number of phases. Actually, smaller numbers of this value generates good results, but it is better to keep it as max as possible to provide perfect sound.
Code changes: