The size of the averageWaveform, peakWaveform, lowWaveform, midWaveform and highWaveform arrays are returned in the waveformSize parameter. If your track is 10 seconds long, then the size will be around 1500 (150 * 10). The overviewWaveform will contain 1 point/sec resolution data.
How can I know the size of the arrays in the waveformSize parameter?
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