ouestlabs/audio-ui @audio-ui/core@0.5.0 on GitHub

90d6c74: New @audio-ui/core/analysis entry: the maths behind a plot, a meter and a waveform, with no framework in it. Spectrum on a log frequency axis with peak hold (logSpectrum, holdPeaks), waveform peaks and bands (computePeaks, downsampleWaveform, spectrumBands), levels (dbToGain, gainToDb, rmsDb), the response of a biquad and of an equalizer (biquadResponse, eqResponse), and the transfer curve of a compressor. The curves are checked against the browser's own nodes: a filter's equals BiquadFilterNode.getFrequencyResponse to within 0.05 dB once the Q is passed to the node with toWebAudioQ (a low-pass and a high-pass take their Q in decibels, which differed by up to 7.7 dB, and a shelf ignores Q, which differed by up to 11 dB), and webAudioCompressorOutput draws the curve of DynamicsCompressorNode, with its one-sided knee and the make-up gain it adds on its own, where compressorOutput stays the textbook curve. downsampleWaveform covers every sample (it dropped the last ones when the length did not divide) and stretches a short input instead of padding it with silence. Input that is not a number gives silence or NaN-free output instead of a throw.