Simple Project: Drum learning app

This a project for making a learning app for drum students.

Heads up! This project is folded here and is being continued on bitbucket!

C/C++

At the moment there are the functions play_from_file (which plays an existing WAVE file) and record_to_file (which records from Default Audio Input and writes it to Disk as WAVE file). It can be compiled with gcc -o test main.c -lsndfile -lportaudio -include audioio.c.

Dependencies

You need

• portaudio (http://www.portaudio.com/)
• libsndfile (http://www.mega-nerd.com/libsndfile/)

Prototypes in Python

At the moment you can load the Python script interactive.py and you'll get in a loop where you can

• record audio (via PortAudio)
• play this back (via PortAudio)
• real-time spectogram plotting
• time-stretch it (simple, pitch-changing, by just interpolating the audio signal)
• writing it to hard disk

Dependencies

At the moment you need

• Python (http://www.python.org/)
• PyAudio (http://people.csail.mit.edu/hubert/pyaudio/)
• NumPy/SciPy (http://www.scipy.org/)
• PyQtGraph (http://www.pyqtgraph.org/)

Time Stretch Tests

In the folder time_stretch_tests there are tests for time stretching. The original file ionisation_orig.mp3 is a small excerpt from Edgar Varèses Ionisation. The stretched files are twice as long, i.e. half tempo. (The files have been converted to mp3 afterwards via lame infile.wav outfile.mp3 -V2.)

• ionisation_dirac3le.mp3 used DIRAC3 LE (http://dirac.dspdimension.com/)
• ionisation_interpolated.mp3 is just an interpolation the signal with drumapp_tools.timestretch, so the pitch is an octave higher
• ionisation_soundtouch.mp3 used SoundTouch (http://www.surina.net/soundtouch/)