hendriks73/jipes

Open source library that allows you to efficiently compute audio features.

Jipes

Jipes is a Java open source library that allows you to efficiently compute audio features. Possible uses for these features are general music information retrieval (MIR) applications or more specifically personal music software like beaTunes.

To use Jipes in your Maven project, use the following dependency:

<dependency>
    <groupId>com.tagtraum</groupId>
    <artifactId>jipes</artifactId>
    <version>X.Y.Z</version>
</dependency>

Replace X.Y.Z with the release version number from .

For more details, please visit the Jipes website.

jipes's Issues

ConstantQ

I am having some issues with the ConstantQ Transform.
By analyzing the same file with the same chain, but with different min and max frequencies I am getting results that don't seem to be consistent.

This is a minimal example:
SignalSource source = new AudioSignalSource(new File("test.wav"));

    int windowLength = 2048;
    WindowFunction windowFunction = new WindowFunction.Hamming(windowLength);

    int hopSize = 1024;
    float minFrequency = 8.1757f;
    float maxFrequency = 12543.853f;
    int binsPerSemitone = 1;

    SignalPump<AudioBuffer> pump = new SignalPump<>(source);
    SignalPipeline<AudioBuffer, LogFrequencySpectrum> cqtPipeline = new SignalPipeline<>(
            new Mono(),                                             // if there are more than one channel, reduce them to mono
            new SlidingWindow(windowFunction.getLength(), hopSize),
            new Mapping<>(AudioBufferFunctions.createMapFunction(windowFunction)),
            new ConstantQTransform(minFrequency, maxFrequency, 12 * binsPerSemitone),
            new AbstractSignalProcessor<LogFrequencySpectrum, ArrayList<LogFrequencySpectrum>>("specID") {  // aggregate the CQTs to a spectrum with id "specID" (needed to access it in the results)
                private final ArrayList<LogFrequencySpectrum> spectrogram = new ArrayList<>();

                @Override
                protected ArrayList<LogFrequencySpectrum> processNext(LogFrequencySpectrum input) throws IOException {
                    this.spectrogram.add(input);
                    return this.spectrogram;
                }
            }
    );
    pump.add(cqtPipeline);
    Map<Object, Object> results = pump.pump();
    ArrayList<LogFrequencySpectrum> result = (ArrayList<LogFrequencySpectrum>) results.get("specID");

Thanks for helping.