react-orchestra
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A toolbox to build interactive and smart instruments on the web and mobile.
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<h1 class="page-title">Source: helpers/getTracksAndMetaFromParsedMidi.js</h1>
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<pre class="prettyprint source linenums"><code>/* mod */
import MidiIO from '../../MidiIO';
import Note from '../Note';
/**
* getTracksAndMetaFromParsedMidi - Convert a json midi file parsed with MidiIO into clean meta and tracks object
*
* @param {array} noteNames noteNames with octave
* @returns {object} Array of note names with octave
* [{firstNoteName: string, intervals: number, guessedScales: array}]
* @example
* const parsedMidi = await getJSONFromMidiURL(url);
* getTracksAndMetaFromParsedMidi(parsedMidi);
* // Returns
* // {
* // meta: object,
* // tracks: array,
* // }
*/
const getTracksAndMetaFromParsedMidi = (midi) => {
const meta = midi.meta;
const tracks = midi.musicTracks.map((track, i) => {
const noteOns = track.noteOnValid;
const noteOffs = track.noteOff;
const trackInstrumentName = meta.instrumentNames[i];
const millisecondsPerTick = meta.millisecondsPerTick;
let previousEndTime = 0;
return noteOffs.map((noteOff) => {
const {
noteNumber,
noteName,
startTimeInMS,
durationInMS,
endTimeInMS,
noteInstrumentName,
deltaTime,
msPerTick,
} = MidiIO.noteOffEventToNote(
noteOff,
trackInstrumentName,
previousEndTime,
millisecondsPerTick
);
previousEndTime = endTimeInMS;
const note = new Note({
noteNumber,
noteName,
startTimeInMS,
durationInMS,
endTimeInMS,
instrumentName: noteInstrumentName,
deltaTime,
msPerTick,
});
return note;
});
});
return { meta, tracks };
};
export default getTracksAndMetaFromParsedMidi;
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<h2><a href="index.html">Home</a></h2><h3>Classes</h3><ul><li><a href="Instrument.html">Instrument</a></li><li><a href="Note.html">Note</a></li></ul><h3>Global</h3><ul><li><a href="global.html#addOctaveToNoteName">addOctaveToNoteName</a></li><li><a href="global.html#getInterval">getInterval</a></li><li><a href="global.html#getIntervalPermutationsFromNoteNames">getIntervalPermutationsFromNoteNames</a></li><li><a href="global.html#getJSONFromMidiURL">getJSONFromMidiURL</a></li><li><a href="global.html#getNoteNamesFromChordName">getNoteNamesFromChordName</a></li><li><a href="global.html#getNoteNamesFromIntervals">getNoteNamesFromIntervals</a></li><li><a href="global.html#getScaleNotes">getScaleNotes</a></li><li><a href="global.html#getScalesFromNoteNames">getScalesFromNoteNames</a></li><li><a href="global.html#getTracksAndMetaFromParsedMidi">getTracksAndMetaFromParsedMidi</a></li><li><a href="global.html#getTracksAndMetaFromUrl">getTracksAndMetaFromUrl</a></li><li><a href="global.html#getUniqueNoteNames">getUniqueNoteNames</a></li><li><a href="global.html#getUniqueNoteNamesNoOctave">getUniqueNoteNamesNoOctave</a></li><li><a href="global.html#isInHigherOctave">isInHigherOctave</a></li><li><a href="global.html#removeOctaveFromNoteName">removeOctaveFromNoteName</a></li><li><a href="global.html#reOrderNotes">reOrderNotes</a></li><li><a href="global.html#updateTempo">updateTempo</a></li></ul>
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Documentation generated by <a href="https://github.com/jsdoc3/jsdoc">JSDoc 3.4.3</a> on Sun Nov 20 2016 16:43:09 GMT+0200 (EET)
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