Audio FFT Visualise

Nov 19, 2018

Changed the Fourier transform, and salience estimation implementations to RenderScript (https://developer.android.com/guide/topics/renderscript/compute), which afforded about 5 to 10-fold improvement in computational time. Provided your phone can do RenderScript, it should be able to handle 100 divisions per semitone, which is sufficient for tuning. Only tested with my Oppo F1s, which was previously not able to do 100 divisions per semitone but is with this version.