Pharo Dj App With Phausto, Spec and Bloc

To build a DJ application with two decks in Pharo, I will make use of three libraries: Phausto for audio file playback (at variable speed), equalization, and filtering. Spec for building a browser to visualize audio files in a folder together with their metadata, and to organize these files into playlists. Bloc for the visualization of audio waveforms and the rendering of UI widgets to control playback speed, pitch, levels, the equalizer, and filter cutoff and resonance. As a first step, Phausto will be used to load and simultaneously play two audio files, mixing them via the Phausto API. Once the audio engine is in place, a Spec application will be built to browse audio files and load them into either of the two decks. With the file browser complete, a conventional user interface will be added to control the mix between the two tracks and their equalization. The Phausto standard library will then be used to add a delay effect per deck. With the DJ application running, final polish can be applied in the form of BPM detection and track quantization, which requires implementing peak detection for audio files within Pharo. Deliverables: The Spec application with audio file browsing and audio playback will be delivered before the first evaluation. The audio visualization and UI built with Bloc will be delivered halfway between the first and final evaluations. Extra features (BPM detection and quantization) will be added and tested before the final evaluation.