AIComposer使用遗传算法和 MIDI 文件输入来 创作音乐_Swift_代码_下载

# AIComposer ## How to compile and run the preexisting data file: 1. Press the Build and Run button in the upper left-hand corner to start the application up. 2. Under 'File' select 'Open...'. 3. Open "ResultsDataSet.aicomp" located in the projects folder. 4. To listen to the playback of a preexisting composition, select it in the table and click 'Play'. 5. To compose a new piece, enter a number of Genes (20-60 work best) and generations (300-500 work best, BUT take a really long time) * Click "COMPOSE". * The field will display information as it runs the algorithm. Note: 'Compose' will not work in a new file because it requires MIDI files formatted in a specific way as input for both Melodic and Chord Progressions. ## Controller Classes * `CompositionController.swift`: this contains all of the functions involved with creating music. * Two genetic algorithms are implemented: * Main theme creation genetic algorithm * Composition creation genetic algorithm * Also contains methods to generate instrument presets and random names. * Has `struct` definitions for `DesiredResults` and `CompositionWeights` ## The Music object structure * `MusicComposition`: an complete piece of music with 4 instruments. * `[MusicPart]`: an array consisting of the four instrument melodies * `[MusicMeasure]`: an array of all of the measures in that instrument's part. * `[MusicNote]`: an array of all of the individual notes in each measure. * `MusicTimeStamp`: a `Double` representing where in the music sequence the note starts. (1.0 is the length of a quarter note) * `MIDINoteMessage`: the actual MIDI message for the note. * `channel: UInt8`: the MIDI channel number. (0-16) * `note: UInt8`: the MIDI note number. (0-127) * `velocity: UInt8`: the velocity (loudness) of the note. (0-127) * `releaseVelocity: UInt8`: The velocity after the note is released. Always set to 0. * `duration: Float32`: The length of the note in a MIDI sequence.