Tiny (0.01s) Gaps Between Audio Outputs from stftPitchShift.shiftpitch()

[Rysertio]

I tried to write an LADSPA plugin using stftPitchShift. However, whenever I call shiftpitch(), it adds a very tiny (about 0.01s) fade in and out at the start and end of each buffer it processes. Here is the plugin code.

I've attempted to solve it by:

• Changing the hop rate, setting the hop rate to 1 to use SDFT instead of STFT.
• Enabling RMS normalization.

Unfortunately, these attempts did not work.

[jurihock]

As mentioned in #18, #33, #34 and finally in the readme file, your have to use the StftPitchShiftCore instance inside of your own STFT pipeline for continuous audio signal processing. The StftPitchShift instance can't do this stuff.

[Rysertio]

I've tried to use the StftPitchShiftCore in here. But the gaps are still there.

[jurihock]

The STFT pipeline provided in this project cannot handle a continuous audio stream. It only handles a finite audio file at once. This is exactly the reason, why you hear gaps in the continuous (endless, not finite) audio stream. Instead you have to implement your own STFT pipeline with required capability.

[jurihock]

Further reading: DAFX (chapter 7 Time-frequency processing)