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();
}