public static List<Double> audioAnalysis( String deviceName, String channel, long averages, NodeContext context) { AudioSource source = (AudioSource) context.getData().get(deviceName + ".source"); if (source == null) return ImmutableList.of(); FFT fft = new FFT(source.bufferSize(), source.sampleRate()); fft.window(FFT.HANN); if (averages > 0) fft.linAverages((int) averages); if (channel.equals("left")) { fft.forward(source.left); } else if (channel.equals("right")) { fft.forward(source.right); } else { fft.forward(source.mix); } ImmutableList.Builder<Double> b = new ImmutableList.Builder<Double>(); if (averages == 0) { for (int i = 0; i < fft.specSize(); i++) b.add((double) fft.getBand(i)); } else { for (int i = 0; i < fft.avgSize(); i++) b.add((double) fft.getAvg(i)); } return b.build(); }
public static List<Double> audioLogAvg( String deviceName, String channel, long baseFreq, long bandsPerOctave, NodeContext context) { AudioSource source = (AudioSource) context.getData().get(deviceName + ".source"); if (source == null) return ImmutableList.of(); FFT fft = new FFT(source.bufferSize(), source.sampleRate()); fft.window(FFT.HANN); fft.logAverages((int) baseFreq, (int) bandsPerOctave); if (channel.equals("left")) { fft.forward(source.left); } else if (channel.equals("right")) { fft.forward(source.right); } else { fft.forward(source.mix); } ImmutableList.Builder<Double> b = new ImmutableList.Builder<Double>(); for (int i = 0; i < fft.avgSize(); i++) b.add((double) fft.getAvg(i)); return b.build(); }