AlgorithmicMusicPlayer

This project presents a method to convert Musical Strings into a WAV file on Android. It was built since MIDI is not supported by Android. If you want to use AlgorithmicMusicPlayer, you need to have a collection of musical Notes stored as WAV files. The App will use FFmpeg Library to create a WAV file for your input. The Musical String is based on JFugue's representation of musical String:

• Notes are separated by a space
• Note is represented by its pitch, octave and duration.
• Pitch can be: A A# B C C# D D# E F F# G G#
• Octave is a number between [0, 8]
• Duration can be: w (whole note), h (half), q (quarter), i (eigth) and s (sixteenth)
• Rest Notes are: rw, rh, rq, ri and rs.

You can download sample piano notes that I trimmed for this project: https://drive.google.com/drive/folders/0B1ej2Qu88yvkQm5fLUdobVhNTWc?resourcekey=0-Ik5bCeAt-6OorHC1BwVfJg&usp=sharing (Add it to your drive so you can download all notes with one click). The notes will produce a song that has a tempo of 120 bpm. In future updates, the option for the user to set the tempo will be added.

Setup Instructions:

• Download the project and import it into Android Studio
• Download the Piano Notes from the link above or provide your own notes.
• Copy the music notes into your phone.
• In the MainActivity, change the path_piano_notes to the path where you pasted the notes. (Note: The path should not contain spaces)
• Edit the path of the output WAV file that the App will produce.
• Run the App!

The following example demonstrates how to use AlgorithmicMusicPlayer in your Android App. You can listen to the WAV files produced from this code at: https://soundcloud.com/ziad-halabi-3/song

@Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        String path_piano_notes = "/storage/emulated/legacy/Audio/pianonotes/";
    
        // Create First Instrument
        Instrument piano_right = new Instrument("piano_right");
        piano_right.setPath_to_notes(path_piano_notes);
        piano_right.setBar("A5i C6i D6h rq A6i C6i G6i F6i E6i A5i D6i C6i A5i C6i D6h rq A6i C6i G6i F6i E6i A5i D6i C6i A5i C6i D6i A5i C6i D6i C6i A5i A6i C6i G6i F6i E6i A5i D6i C6i D5i F5i A5i F5i A5i D6i A5i D6i F6i D6i F6i D7w");

        // Create Second Instrument
        Instrument piano_left = new Instrument("piano_left");
        piano_left.setBar("D4w F4h C4h D4w A#3h A3h D4w F4h C4h D4w Rw");
        piano_left.setPath_to_notes(path_piano_notes);

        //Add Instruments to a Player    
        Player p = new Player(this.getApplicationContext());
        p.addInstrument(piano_right);
        p.addInstrument(piano_left);

        //Create a Wav File of the song
        File outputFile = new File(Environment.getExternalStorageDirectory(), "song.wav");
        p.produceMusic(outputFile.getAbsolutePath(), new MusicGeneratingCallback() {
            @Override
            public void onError(String message) {
            }

            @Override
            public void onSuccess(String message) {
            }
        });
}

Reference:

• Check JFugue Library (http://www.jfugue.org/) that is a great library for algorithmic music composition. It is written in JAVA and uses javax.sound which is not supported on Android. This library has been developped in order to overcome this limitation.
• Thanks to bravobit for publishing ffmpeg-android library (https://github.com/bravobit/FFmpeg-Android)