openFrameworks wrapper for Essentia. Audio analysis algorithms in real-time
C++ Makefile Fortran C
Latest commit 44e2a04 Feb 6, 2017 @leozimmerman added



openFrameworks addon for audio analysis. It provides the following algorithms :

  • RMS, Instant power, Energy, Pitch frequency, Pitch Confidence, Pitch Salience, HFC, Centroid, Inharmonicity, Spectral Complexity, Dissonance, Roll Off, Odd To Even Harmonic Energy Ratio, Strong Peak, Strong Decay, Onsets, Spectrum, Mel Bands, MFCC, Harmonic Pitch Class Profile, Tristimulus


This addon uses Essentia library.

Demo video:


OSX & Linux - OF 0.9.7 - 64 bits compilation.

Tested with OSX 10.11.6 and Ubuntu 14.04


  • Linux: Makefiles.

  • OSX: The best and easiest way is to use Xcode Projects. You can also use the makefiles, but in OSX you'll need to add ofxAudioDecoder to addons.make.


For playing and analyzing audio files (see Audio File Player), ofxAudioDecoder addon is needed for OSX.


  • The examples included in the repository can be used to build new projects specially the empty ones. They can be compiled with Xcode or by Terminal using the Makefiles.

  • Creating a new project:

    • Create a new project using the Project Generator. Be sure to include ofxAudioAnalyzer and ofxAudioDecoder addons.

    • Include ofxAudioAnalyzer header into ofApp.h

      #include "ofxAudioAnalyzer.h"
    • Create an instance of ofxAudioAnalyzer into ofApp class:
    ofxAudioAnalyzer audioAnalyzer;
    • In the setup() function setup the audioAnalyzer's parameters (sampleRate, bufferSize, channels). Be sure that the parameters of the audioAnalyzer match the parameters of the ofSoundStream or the audio files you load to the sound player to avoid errors:
    audioAnalyzer.setup(44100, 512, 2);
    • Analyze the ofSoundBuffer in ofApp::audioIn() and ofApp::audioOut() when using ofSoundStream, or in the ofApp::update() if you are using audio file player, ofSoundBuffer parameters must always match audioAnalyzer's:
    • Retrieve analysis results specifying algorithm, channel, smooth amount and if you want it normalized (Smoothing and normalizing are optionals. Normalizing is not necessary for all algorithms, some of them output values from 0.0-1.0 by default. See allAlgorithms example):
    float rms = audioAnalyzer.getValue(RMS, channel, smoothAmount, doNormalize);

Audio File player

This repository includes an extended version of ofBaseSoundPlayer taken and modified from:

This class [ofSoundPlayerExtended] lets you load, play and analyze audiofiles (wav & mp3). See examples: allAlgorithms, audioFilePlayer and onsets to understand how it works.

(!) ofSoundPlayerExtended is not really necessary for the addon to work. If you don't need or it's giving to much errors, just remove it from Xcode project or the addon's /src directory.


For any bug, help or feature request open an issue or check this OF Forum Thread.


Essentia library and this addon are distributed under Affero GPLv3 license. See License