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var tunebook = require('../api/abc_tunebook');
var midiCreate = require('../midi/abc_midi_create');
var getMidiFile = function(source, options) {
var params = {};
if (options) {
for (var key in options) {
if (options.hasOwnProperty(key)) {
params[key] = options[key];
}
}
}
params.generateInline = false;
function callback(div, tune, index) {
var downloadMidi = midiCreate(tune, params);
switch (params.midiOutputType) {
case "encoded":
return downloadMidi;
case "binary":
var decoded = downloadMidi.replace("data:audio/midi,", "");
decoded = decoded.replace(/MThd/g,"%4d%54%68%64");
decoded = decoded.replace(/MTrk/g,"%4d%54%72%6b");
var buffer = new ArrayBuffer(decoded.length/3);
var output = new Uint8Array(buffer);
for (var i = 0; i < decoded.length/3; i++) {
var p = i*3+1;
var d = parseInt(decoded.substring(p, p+2), 16);
output[i] = d;
}
return output;
case "link":
default:
return generateMidiDownloadLink(tune, params, downloadMidi, index);
}
}
if (typeof source === "string")
return tunebook.renderEngine(callback, "*", source, params);
else
return callback(null, source, 0);
};
function isFunction(functionToCheck) {
var getType = {};
return functionToCheck && getType.toString.call(functionToCheck) === '[object Function]';
}
var generateMidiDownloadLink = function(tune, midiParams, midi, index) {
var divClasses = ['abcjs-download-midi', 'abcjs-midi-' + index]
if (midiParams.downloadClass)
divClasses.push(midiParams.downloadClass)
var html = '<div class="' + divClasses.join(' ') + '">';
if (midiParams.preTextDownload)
html += midiParams.preTextDownload;
var title = tune.metaText && tune.metaText.title ? tune.metaText.title : 'Untitled';
var label;
if (midiParams.downloadLabel && isFunction(midiParams.downloadLabel))
label = midiParams.downloadLabel(tune, index);
else if (midiParams.downloadLabel)
label = midiParams.downloadLabel.replace(/%T/, title);
else
label = "Download MIDI for \"" + title + "\"";
title = title.toLowerCase().replace(/'/g, '').replace(/\W/g, '_').replace(/__/g, '_');
var filename = (midiParams.fileName) ? midiParams.fileName : title + '.midi';
html += '<a download="' + filename + '" href="' + midi + '">' + label + '</a>';
if (midiParams.postTextDownload)
html += midiParams.postTextDownload;
return html + "</div>";
};
module.exports = getMidiFile;
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