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processing.js
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processing.js
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const path = require('path');
const fs = require('fs');
const AudioContext = require('web-audio-api').AudioContext;
const audioContext = new AudioContext;
const fileType = require('file-type');
const toAiff = require('audiobuffer-to-aiff')
const MAX_FILE_SIZE = 20; //in MB
let filePathArray = new Array(24).fill(null);
let audioObjArray = new Array(24).fill(null);
let totalLengthSec = 0;
let outputDir = '';
let player = new Audio();
let errorMsg = document.querySelector('#error-msg');
let successMsg = document.querySelector('#success-msg');
let resultMsg = document.querySelector('#result-msg');
let deleteBtn = document.querySelectorAll('.delete-sample');
let detailsBtn = document.querySelectorAll('.sample-details-btn');
let fileInputs = document.querySelectorAll('.samples');
let uploadBtn = document.querySelectorAll('.upload-btn');
let outputDirSelect = document.querySelector('#output-dir-select');
let outputDirBtn = document.querySelector('#output-dir-btn');
let outputDirText = document.querySelector('#output-dir-text');
let octaveChecks = document.querySelectorAll('.octave-check');
fs.readFile('./config.json', (err, data) => {
if (err) throw err;
setOutputDirectory(JSON.parse(data).outputDirectory);
});
outputDirBtn.onclick = () => outputDirSelect.click()
outputDirSelect.onchange = function () {
if (this.files[0]) {
setOutputDirectory(this.files[0].path);
}
}
uploadBtn.forEach((btn, i) => {
btn.onclick = () => {
fileInputs[i].click();
}
})
octaveChecks.forEach((checkbox, i) => {
checkbox.onclick = () => {
let checked = checkbox.getAttribute('checked') == 'true';
if (checked) {
checkbox.style.background = 'transparent';
audioObjArray[i].pitchDown = false;
}
else {
checkbox.style.background = 'black';
audioObjArray[i].pitchDown = true;
}
checkbox.setAttribute('checked', !checked);
}
})
fileInputs.forEach((inputElement, i) => {
let tempFilePath = "";
inputElement.onchange = function () {
if (this.files[0]) {
tempFilePath = this.files[0].path;
let stats = fs.statSync(tempFilePath)
let fileSizeInBytes = stats["size"]
if (fileSizeInBytes < (MAX_FILE_SIZE * 1000000)) {
fs.readFile(tempFilePath, (err, buf) => {
if (err) {
console.log(err);
inputElement.value = "";
alert(err);
} else if (!fileType(buf) || (fileType(buf).mime != "audio/vnd.wave" && fileType(buf).mime != "audio/aiff" && fileType(buf).mime != "audio/mpeg")) {
console.log(fileType(buf));
inputElement.value = "";
sendError("Supported file types are WAV, MP3 and AIFF.");
} else {
processWav(tempFilePath, fileType(buf).mime, (audioObj) => {
if (audioObj.sampleRate != 44100) {
inputElement.value = "";
sendError("Sample rate of the WAV file must be 44.1 kHz")
} else {
filePathArray[i] = tempFilePath;
audioObjArray[i] = audioObj;
totalLengthSec = Math.ceil(getTotalLength() * 100) / 100;
errorMsg.innerHTML = "";
uploadBtn[i].style.display = "none";
deleteBtn[i].style.display = "block";
detailsBtn[i].style.display = "flex";
octaveChecks[i].style.display = "flex";
updateScreen(audioObj, detailsBtn[i], detailsBtn);
updateTotalLength();
}
})
}
})
} else {
inputElement.value = "";
sendError("Max supported file size is " + MAX_FILE_SIZE + " MB.")
}
}
}
});
document.querySelectorAll('.delete-sample').forEach((deleteBtn, i) => {
deleteBtn.onclick = function () {
document.querySelectorAll('.samples')[i].value = "";
deleteBtn.style.display = "none";
detailsBtn[i].style.display = "none";
uploadBtn[i].style.display = "flex";
octaveChecks[i].style.display = "none"
if (detailsBtn[i].getAttribute("selected") == "true") {
document.querySelector('#success-msg').innerHTML = "";
}
filePathArray[i] = null;
audioObjArray[i] = null;
totalLengthSec = Math.ceil(getTotalLength() * 100) / 100;
updateTotalLength();
}
});
detailsBtn.forEach((btn, i) => {
btn.onclick = function () {
updateScreen(audioObjArray[i], btn, detailsBtn);
if (player.paused) {
player.currentTime = 0;
player.src = filePathArray[i]
player.play();
} else {
player.pause();
}
}
})
document.querySelector('#generate-btn').onclick = () => {
if (outputDir) {
getOpzObject((obj) => {
joinMultipleAudio(filePathArray, (inputDir, err) => {
if (err) {
console.log(err);
} else {
let date = new Date();
let isoDate = new Date(date.getTime() - (date.getTimezoneOffset() * 60000)).toISOString();
//let outputDir = "./temp/OP-Z_join_" + isoDate + ".aiff";
joinJSONtoAIFF(inputDir, obj, (resultDir) => {
emptyTempDir();
updateResult(resultDir);
})
}
});
});
} else {
sendError('Select the output folder first.')
}
}
function setOutputDirectory(path) {
if (fs.existsSync(path)) {
outputDir = path;
outputDirText.innerHTML = outputDir;
} else {
outputDir = '';
outputDirText.innerHTML = 'Output folder not selected.';
}
fs.writeFileSync('config.json', JSON.stringify({ outputDirectory: outputDir }));
}
function emptyTempDir() {
let tempDirectory = './temp';
fs.readdir(tempDirectory, (err, files) => {
if (err) throw err;
for (const file of files) {
fs.unlink(path.join(tempDirectory, file), err => {
if (err) throw err;
});
}
});
}
function getOpzObject(callback) {
let actStart = 0;
let starts = new Array(24).fill(0);
let ends = new Array(24).fill(0);
let pitches = new Array(24).fill(0);
let OpzObject = {};
audioObjArray.forEach((obj, i) => {
if (obj) {
starts[i] = actStart;
ends[i] = starts[i] + toOPTime(obj.timeLength);
actStart = (ends[i] + 1);
if(obj.pitchDown) pitches[i] = -6000;
}
})
//in the OP json's PITCH field, the -6000 value tunes the sample ONE OCTAVE DOWN (Pitch down TODO)
fs.readFile('./JSON/drum_JSON_template.json', (err, data) => {
if (err) throw err;
OpzObject = JSON.parse(data);
OpzObject.start = starts;
OpzObject.end = ends;
OpzObject.pitch = pitches;
callback(OpzObject)
});
}
function toOPTime(seconds) {
return Math.round(seconds / 12 * 2147483647);
}
function updateTotalLength() {
let lengthElement = document.querySelector('#total-length');
if (totalLengthSec > 0 && totalLengthSec <= 12) {
lengthElement.style.color = "green";
document.querySelector('#generate-btn').disabled = false;
} else {
lengthElement.style.color = "red";
document.querySelector('#generate-btn').disabled = true;
}
lengthElement.innerHTML = totalLengthSec + " / 12 sec";
}
function appendBuffers(buffers) {
let totalLength = 12 * buffers[0].sampleRate;
let tmp = audioContext.createBuffer(1, totalLength, buffers[0].sampleRate);
let currentLength = 0;
let channel = tmp.getChannelData(0);
buffers.forEach(buffer => {
let bufferData = buffer.getChannelData(0);
channel.set(bufferData, currentLength);
currentLength += (bufferData.length);
// changing the last 10 elements to zeros
// to remove the peak at the end of the signal
channel.set([0, 0, 0, 0, 0, 0, 0, 0, 0, 0], currentLength - 10);
});
return tmp;
}
async function joinMultipleAudio(paths, callback) {
buffers = [];
for (const path of paths) {
if (path) {
let buffer = await getAudioBuffer(path);
buffers.push(buffer)
}
}
resultBuffer = appendBuffers(buffers);
let aif = toAiff(resultBuffer);
let chunk = new Uint8Array(aif);
let isoDateString = new Date().toISOString();
let outputDir = './temp/output-join-' + isoDateString + '.aiff';
outputDir = outputDir.split(':').join('_');
fs.writeFile(outputDir, Buffer.from(chunk), function (err) {
if (err) callback(null, err);
else callback(outputDir, null);
});
}
function getTotalLength() {
let total = 0;
audioObjArray.forEach((obj) => {
if (obj) total += obj.timeLength;
});
return total;
}
function sendError(msg) {
console.log(msg);
errorMsg.innerHTML = "<br><br>" + msg;
successMsg.innerHTML = "";
resultMsg.innerHTML = "";
}
function updateDetails(audioObj, elementId) {
errorMsg.innerHTML = "";
successMsg.innerHTML = "";
resultMsg.innerHTML = "";
let screen = document.querySelector(elementId);
let msg = "<br> MIME type: " + audioObj.mime + "<br>" +
"Sample rate: " + audioObj.sampleRate + " Hz" + "<br>" +
"Time length: " + Math.round(audioObj.timeLength * 100) / 100 + " sec" + "<br>" +
"Sample length: " + audioObj.sampleLength + " samples" + "<br>" +
"Channels: " + audioObj.channelNumber + " channel(s)";
screen.innerHTML = msg;
}
function updateScreen(audioObj, button, otherButtons) {
otherButtons.forEach((btn) => {
btn.style.background = "transparent";
btn.setAttribute("selected", false);
})
document.querySelector('#result-msg').innerHTML = "";
button.setAttribute("selected", true);
button.style.background = "black";
let filename = audioObj.filename.split(".")[0];
if (filename.length > 13) filename = "..." + filename.slice(filename.length - 9, filename.length);
button.innerHTML = filename + " - " + (Math.round(audioObj.timeLength * 100) / 100) + " sec"
updateDetails(audioObj, "#success-msg")
}
function updateResult(resultDir) {
document.querySelector('#success-msg').innerHTML = "";
document.querySelector('#error-msg').innerHTML = "";
detailsBtn.forEach((btn) => {
btn.style.background = "transparent";
btn.setAttribute("selected", false);
})
resultMsg.innerHTML = "<br>The OP-Z sample is ready!<br><br>File location: " + resultDir;
}
function getAudioBuffer(filePath) {
let audioContext = new AudioContext;
let resp = fs.readFileSync(filePath);
return new Promise((resolve, reject) => {
audioContext.decodeAudioData(resp, buffer => {
resolve(buffer);
})
})
}
async function processWav(path, mime, callback) {
let buffer = await getAudioBuffer(path);
let filename = path.split("/").pop();
let data = buffer.getChannelData(0);
let obj = {
filename: filename,
mime: mime,
samples: data,
sampleRate: buffer.sampleRate,
sampleLength: data.length,
timeLength: data.length / buffer.sampleRate,
channelNumber: buffer.numberOfChannels,
pitchDown: false
};
return callback(obj);
}
function joinJSONtoAIFF(aiffPath, obj, callback) {
fs.readFile(aiffPath, (err, buf) => {
if (err) throw err;
let startBuf = Buffer.from(new Uint8Array([0x41, 0x50, 0x50, 0x4c]));
let json = "op-1" + JSON.stringify(obj);
json += String.fromCharCode(0x0a);
if (json.length % 2 !== 0) {
json += " ";
}
let jsonBuf = Buffer.from(json);
let lenBuf = Buffer.alloc(4);
lenBuf.writeInt32BE(jsonBuf.length);
let applBuf = Buffer.concat([startBuf, lenBuf, jsonBuf]);
let sndPos = buf.indexOf("SSND");
let output = Buffer.alloc(buf.length + applBuf.length);
buf.copy(output, 0, 0, sndPos);
applBuf.copy(output, sndPos);
buf.copy(output, sndPos + applBuf.length, sndPos);
let blob = new Blob([output], { type: "audio/x-aiff; charset=binary" });
let date = new Date();
let isoDate = new Date(date.getTime() - (date.getTimezoneOffset() * 60000)).toISOString().split('.')[0].split(':').join('_');
let outputDirTemp = outputDir + "/OP-Z_PACK_" + isoDate + '.aif';
var fileReader = new FileReader();
fileReader.onload = function () {
fs.writeFileSync(outputDirTemp, Buffer.from(new Uint8Array(this.result)));
callback(outputDirTemp);
};
fileReader.readAsArrayBuffer(blob);
});
}