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metronome.js
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metronome.js
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/**
* /metronome.js
*
* My own implementation of a metronome, with many features
* that support for accurate measuring and calculating
* offset and bpm for audio file.
*
* This file is licensed under the MIT License.
* See LICENSE in the project root for license information.
*
* @author Belikhun
* @version 1.0
* @license MIT
* @copyright 2022 Belikhun
*/
const metronome = {
/** @type {TreeDOM} */
timeline: undefined,
/** @type {TreeDOM} */
view: undefined,
/** @type {TreeDOM} */
meters: undefined,
/** @type {TreeDOM} */
monitors: undefined,
/** @type {TreeDOM} */
timingPanel: undefined,
SAMPLE_PER_SEC: 600,
METER_MIN: -49,
METER_MAX: 5,
METER_STEP: 5,
METER_LINE: 10,
METER_UPDATE: 40,
meterLastUpdate: 0,
/** Pixels per tick */
tickScale: 80,
pxPerSecond: 1,
currentSwingRotate: 0,
currentBPM: 0,
currentOffset: 0,
currentTime: 0,
currentBeatTick: -1,
currentRulerSampleRate: 0,
seekTarget: 0,
/** @type {HTMLElement} */
offsetLabel: undefined,
/** @type {HTMLElement} */
bpmLabel: undefined,
/**
* This is a specical variable used to tick in update
* function, do not use this if you don't know what you
* are doing!
*
* For a accurate measurement of current tick please use
* `metronome.tick`.
* @type {Number}
*/
currentTick: -1,
timePerBeat: 1,
timelineWidth: 0,
/** @type {Animator} */
swingAnimator: undefined,
/** @type {Animator} */
seekAnimator: undefined,
updateRequest: undefined,
meterResetTimeout: undefined,
lastFrameStart: undefined,
isLoading: false,
reUpdate: false,
alternate: false,
playing: false,
swingLeft: true,
/** @type {HTMLElement[]} */
tickBars: [],
/** @type {Object<number, HTMLElement[]>} */
labels: [],
FPS_SAMPLES: 60,
fpsValues: [],
UT_SAMPLES: 60,
utValues: [],
/**
* @typedef {{
* tick: Number
* node: HTMLElement
* canvas: HTMLCanvasElement
* update: Boolean
* }} ComparatorNode
* @type {ComparatorNode[]} */
comparators: [],
comparatorCurrentFrom: undefined,
comparatorCurrentTo: undefined,
comparatorCurrentTick: undefined,
COMPARATOR_TICKS: 8,
COMPARATOR_SIZE: 300,
audio: {
/** @type {HTMLAudioElement} */
instance: undefined,
/** @type {AudioBuffer} */
buffer: undefined,
/** @type {AudioContext} */
context: undefined,
/** @type {ChannelSplitterNode} */
splitter: undefined,
/** @type {AnalyserNode} */
left: undefined,
/** @type {AnalyserNode} */
right: undefined,
/** @type {Float32Array} */
leftData: undefined,
/** @type {Float32Array} */
rightData: undefined,
/** @type {Float32Array} */
leftFreqs: undefined,
/** @type {Float32Array} */
rightFreqs: undefined,
points: [],
reduces: [],
leftMax: 0,
rightMax: 0,
leftMaxTime: 0,
rightMaxTime: 0,
duration: 0,
},
sounds: {
/** @type {HTMLAudioElement} */
latch: "sounds/latch.mp3",
/** @type {HTMLAudioElement} */
tickDownbeat: "sounds/tick-downbeat.mp3",
/** @type {HTMLAudioElement} */
tick: "sounds/tick.mp3"
},
/**
* Log to console.
* @param {CLogLevel} level Log level
* @param {...CLogArg} args Log info
*/
log(level, ...args) {
clog(level, {
color: oscColor("pink"),
text: "metronome",
padding: 34,
separate: true
}, ...args);
},
/**
* Initialize metronome inside this container
* @param {HTMLElement} container
* @param {Object} options
* @param {Number} options.bpm Beat per minute
* @param {Number} options.scale Timeline scale (pixels per beat)
*/
async init(container, {
bpm = 60,
scale = 80
} = {}) {
if (container && typeof container !== "object" || !container.tagName)
throw { code: -1, description: `metronome.init(): not a valid container!` }
this.timeline = makeTree("div", "timeline", {
timer: { tag: "span", class: "timer", child: {
time: { tag: "div", class: "time", child: {
// Ugly hack to prevent creating alot of nodes
// and make font look fixed-width
m1: { tag: "span", text: "0" },
m2: { tag: "span", text: "0" },
sep1: { tag: "sep", text: ":" },
s1: { tag: "span", text: "0" },
s2: { tag: "span", text: "0" },
sep2: { tag: "sep", text: ":" },
ms1: { tag: "span", text: "0" },
ms2: { tag: "span", text: "0" },
ms3: { tag: "span", text: "0" }
}},
ticks: { tag: "div", class: "ticks", child: {
current: { tag: "span", class: "current", text: "0" },
sep1: { tag: "sep", text: "/" },
total: { tag: "span", class: "total", text: "0" }
}},
bpm: { tag: "div", class: "bpm", text: "0 BPM" },
dots: { tag: "div", class: "dots", child: {
0: { tag: "span" },
1: { tag: "span" },
2: { tag: "span" },
3: { tag: "span" }
}}
}},
graph: { tag: "span", class: "graph", child: {
preview: { tag: "canvas", class: "preview" },
inner: { tag: "div", class: "inner", child: {
label: { tag: "div", class: "labels" },
ticks: { tag: "div", class: "ticks" }
}},
cursor: { tag: "img", class: "cursor", src: "parts/timeCursor.svg" },
loading: { tag: "div", class: "spinner" },
overlay: { tag: "div", class: "overlay" },
progress: { tag: "div", class: "progress", child: {
canvas: { tag: "canvas" },
view: { tag: "div", class: "view" },
cursor: { tag: "img", class: "cursor", src: "parts/timeCursorSmall.svg" }
}}
}},
buttons: { tag: "span", class: "buttons", child: {
play: { tag: "span", class: ["button", "play"] },
stop: { tag: "span", class: ["button", "stop"] },
sub: { tag: "span", class: "sub", child: {
prevTick: { tag: "span", class: ["button", "prevTick"] },
nextTick: { tag: "span", class: ["button", "nextTick"] },
end: { tag: "span", class: ["button", "end"] }
}}
}}
});
this.meters = makeTree("div", "meters", {
ruler: { tag: "div", class: "ruler" },
left: { tag: "div", class: ["channel", "left"], child: {
label: { tag: "span", class: "label", text: "L" },
value: { tag: "span", class: "value", text: "? db" },
bar: { tag: "div", class: "bar" },
clip: { tag: "span", class: "clip" },
max: { tag: "span", class: "max" }
}},
right: { tag: "div", class: ["channel", "right"], child: {
label: { tag: "span", class: "label", text: "R" },
value: { tag: "span", class: "value", text: "? db" },
bar: { tag: "div", class: "bar" },
clip: { tag: "span", class: "clip" },
max: { tag: "span", class: "max" }
}},
label: { tag: "div", class: "label", text: "ÂM LƯỢNG" }
});
this.monitors = makeTree("div", "monitors", {
label: { tag: "label", text: "Âm Thanh" },
left: { tag: "span", class: "left", child: {
canvas: { tag: "canvas" },
ruler: { tag: "div", class: "ruler" },
db: { tag: "div", class: "db" },
label: { tag: "label", text: "Trái" }
}},
right: { tag: "span", class: "right", child: {
canvas: { tag: "canvas" },
ruler: { tag: "div", class: "ruler" },
db: { tag: "div", class: "db" },
label: { tag: "label", text: "Phải" }
}},
});
this.timingPanel = makeTree("div", "timing", {
label: { tag: "label", text: "Thời gian" },
top: { tag: "div", class: "top", child: {
metronome: { tag: "div", class: "metronome", child: {
body: { tag: "img", class: "body", src: "parts/body.svg" },
swing: { tag: "div", class: "swing", child: {
stick: { tag: "div", class: "stick" },
weight: { tag: "img", class: "weight", src: "parts/weight.svg" }
}},
pin: { tag: "div", class: "pin" },
lock: { tag: "img", class: "lock", src: "parts/lockingWedge.svg" },
cover: { tag: "img", class: "cover", src: "parts/cover.svg" },
value: { tag: "span", class: "value", text: "000" }
}},
comparator: { tag: "div", class: "comparator" }
}},
controls: { tag: "div", class: "controls", child: {
offset: { tag: "div", class: "offset", child: {
top: { tag: "div", class: "top", child: {
adjust: this.createAdjustmentButton({
label: "Độ trễ",
steps: [1, 2, 5, 10, "1 tick"],
onInput: (value) => {
switch (value) {
case "1 tick":
this.offset += this.timePerBeat;
break;
case "-1 tick":
this.offset -= this.timePerBeat;
break;
default:
this.offset += (value / 1000);
}
}
}),
now: createButton("NOW", {
element: "div",
style: "round",
icon: "stopwatch",
complex: true,
onClick: () => this.offset = this.time
})
}},
input: createOscInput({
label: "Độ trễ",
type: "number",
onEnter: (value) => this.offset = value / 1000
})
}},
bpm: { tag: "div", class: "bpm", child: {
adjust: this.createAdjustmentButton({
label: "BPM",
steps: [0.1, 0.2, 0.5, 1, 2, "x2"],
onInput: (value) => {
switch (value) {
case "x2":
this.bpm *= 2;
break;
case "/2":
this.bpm /= 2;
break;
default:
this.bpm += value;
}
}
}),
input: createOscInput({
label: "BPM",
type: "number",
onEnter: (value) => this.bpm = value
})
}}
}},
tap: { tag: "div", class: "tap", child: {
label: { tag: "div", class: "label", text: "chạm" },
info: { tag: "div", class: "info", html: `hoặc dùng phím <code>T</code>` }
}},
inputs: { tag: "div", class: "inputs", child: {
timeAdjust: this.createAdjustmentButton({
label: "Thời gian",
steps: [0.1, 0.2, 0.5, 1, 2, 5, 10, 20, 30, 60],
onInput: (value) => this.seek(this.time + value)
}),
time: createOscInput({
type: "number",
label: "Thời gian",
value: this.time,
onEnter: (value) => this.seek(value)
}),
scale: createOscInput({
type: "number",
label: "Tỉ lệ (px)",
onEnter: (value) => this.scale = value
}),
samples: createOscInput({
type: "number",
label: "SAMPLE_PER_SEC",
value: this.SAMPLE_PER_SEC,
onEnter: (value) => {
this.SAMPLE_PER_SEC = value;
this.sampleDataPoints();
this.renderWaveform();
this.renderComparator(this.currentTick);
}
})
}}
});
this.view = makeTree("div", "view", {
meters: this.meters,
panels: { tag: "span", class: "panels", child: {
waves: this.monitors,
timing: this.timingPanel
}},
fps: { tag: "span", class: "fps", child: {
value: { tag: "div", class: "value", text: "not running" },
time: { tag: "div", class: "time", text: "∞ μs" }
}}
});
if (typeof Scrollable === "function") {
new Scrollable(this.view, {
content: this.view.panels
});
}
this.timingPanel.top.comparator.style.width = `${this.COMPARATOR_SIZE}px`;
this.timingPanel.top.comparator.style.height = `${this.COMPARATOR_SIZE}px`;
container.tabIndex = -1;
container.classList.add("MetronomeContainer");
container.append(this.timeline, this.view);
container.addEventListener("keydown", e => this.keyPress(e));
this.loading = true;
//* ========================= Events =========================
this.timeline.buttons.play.addEventListener("click", () => this.toggle());
this.timeline.buttons.stop.addEventListener("click", () => this.stop());
this.timeline.buttons.sub.prevTick.addEventListener("click", () => this.seekLastTick());
this.timeline.buttons.sub.nextTick.addEventListener("click", () => this.seekNextTick());
this.timeline.buttons.sub.end.addEventListener("click", () => this.seek(this.audio.duration));
this.timeline.graph.addEventListener("wheel", (e) => {
// Scale instead when ctrl key is holding
if (e.ctrlKey) {
e.preventDefault();
this.scale = this.tickScale - (e.deltaY / 100) * 10;
return;
}
this.seek(this.seekTarget + (e.deltaY * (1 / this.pxPerSecond)));
});
this.timeline.graph.progress.addEventListener("click", (e) => {
let rect = this.timeline.graph.progress.getBoundingClientRect();
let posX = e.clientX - rect.x;
this.seek(this.audio.duration * (posX / this.graphWidth));
});
this.timingPanel.tap.addEventListener("click", () => this.tapBPM());
// Dragging timeline
this.timeline.graph.overlay.addEventListener("mousedown", (e) => this.startTimelineDrag(e));
window.addEventListener("mouseup", () => this.endTimelineDrag());
//* ========================= Init =========================
this.meters.style.setProperty("--rate", `${this.METER_UPDATE}ms`);
this.bpm = bpm;
this.scale = scale;
this.initDbRulers();
this.renderComparator(0);
await this.initSounds();
this.loading = false;
},
timelineDragging: false,
timelineDragStart: 0,
timelineDragStartTime: 0,
timelineDragLastTick: 0,
timelineDragDelta: 0,
timelineDragUpdater: undefined,
/**
* Setup timeline for dragging
* @param {MouseEvent} e
*/
startTimelineDrag(e) {
if (this.playing)
return;
this.timelineDragStart = e.clientX;
this.timelineDragStartTime = this.time;
this.timelineDragLastTick = 0;
this.timelineDragDelta = 0;
this.timelineDragUpdater = (e) => this.updateTimelineDrag(e);
this.timelineDragging = true;
window.addEventListener("mousemove", this.timelineDragUpdater);
},
/**
* Update dragging
* @param {MouseEvent} e
*/
updateTimelineDrag(e) {
let delta = e.clientX - this.timelineDragStart;
this.timelineDragDelta = delta - this.timelineDragLastTick;
this.timelineDragLastTick = delta;
this.time = this.timelineDragStartTime - (delta / this.pxPerSecond);
},
/**
* Update dragging
* @param {MouseEvent} e
*/
endTimelineDrag() {
if (!this.timelineDragging)
return;
if (this.timelineDragDelta < -10 || this.timelineDragDelta > 10)
this.seek(this.time - ((this.timelineDragDelta * 4) / this.pxPerSecond));
window.removeEventListener("mousemove", this.timelineDragUpdater);
this.timelineDragUpdater = undefined;
this.timelineDragLastTick = 0;
this.timelineDragDelta = 0;
this.timelineDragging = false;
},
/**
* Handle key event
* @param {KeyboardEvent} event
*/
keyPress(event) {
switch (event.code) {
case "Space":
this.toggle();
break;
case "KeyS":
this.stop();
break;
case "ArrowRight":
this.seekNextTick();
break;
case "ArrowLeft":
this.seekLastTick();
break;
case "KeyT":
this.tapBPM();
break;
default:
this.log("DEBG", `key press = ${event.code}`);
break;
}
},
tapStart: 0,
tapCount: 0,
tapping: false,
tapEndTimeout: undefined,
tapResetTimeout: undefined,
tapLastTime: undefined,
tapSamples: [],
TAP_SAMPLES: 16,
set tapBPMInfo(/** @type {String} */ info) {
this.timingPanel.tap.info.innerHTML = info;
},
async tapBPM() {
clearTimeout(this.tapEndTimeout);
clearTimeout(this.tapResetTimeout);
// Tap init
if (!this.tapping) {
this.timingPanel.tap.classList.add("tapping");
this.tapSamples = []
this.tapping = true;
this.tapCount = 0;
}
let now = performance.now();
this.tapCount += 1;
this.playSound((this.tapCount % 4 === 0)
? this.sounds.tickDownbeat
: this.sounds.tick);
this.timingPanel.tap.classList.remove("tapped");
await nextFrameAsync();
this.timingPanel.tap.classList.add("tapped");
if (this.tapLastTime)
this.tapSamples.push(now - this.tapLastTime);
if (this.tapSamples.length > this.TAP_SAMPLES)
this.tapSamples.shift();
this.tapLastTime = now;
if (this.tapCount <= 4) {
this.tapBPMInfo = "O".repeat(this.tapCount);
} else {
let avg = this.tapSamples.reduce((a, b) => a + b, 0) / this.tapSamples.length;
let bpm = Math.round(60 / (avg / 1000));
this.tapBPMInfo = `${bpm} BPM`;
this.bpm = bpm;
}
this.tapResetTimeout = setTimeout(() => this.timingPanel.tap.classList.remove("tapped"), 600);
this.tapEndTimeout = setTimeout(() => this.endTapBPM(), 2000);
},
async endTapBPM() {
if (!this.tapping)
return;
clearTimeout(this.tapEndTimeout);
this.timingPanel.tap.classList.remove("tapping");
this.tapBPMInfo = `hoặc dùng phím <code>T</code>`;
this.tapping = false;
this.tapCount = 0;
this.tapLastTime = undefined;
},
/**
* Create fine value adjustment button.
* @param {Object} options
* @param {String} options.label
* @param {Number[]} options.steps
* @param {Number} options.holdInterval
* @param {(value: Number|String) => any} options.onInput
* @returns
*/
createAdjustmentButton({
label = "TEST",
steps = [1, 2, 5, 10],
holdInterval = 100,
onInput = () => {}
}) {
let container = makeTree("div", "fineAdjustmentButton", {
decrease: { tag: "span", class: "buttons" },
increase: { tag: "span", class: "buttons" },
label: { tag: "span", class: "label", text: label },
value: { tag: "span", class: "value", text: 0 }
});
let decreases = []
let increases = []
const hoverD = (index, step) => {
// Reset
for (let i of decreases)
i.classList.remove("hover");
if (index > -1) {
container.value.classList.add("show");
container.value.innerText = step;
container.value.dataset.pos = "left";
for (let i = decreases.length - 1; i >= index; i--)
decreases[i].classList.add("hover");
} else {
container.value.classList.remove("show");
}
}
const hoverI = (index, step) => {
// Reset
for (let i of increases)
i.classList.remove("hover");
if (index > -1) {
container.value.classList.add("show");
container.value.innerText = (step[0] === "x") ? step : `+${step}`;
container.value.dataset.pos = "right";
for (let i = 0; i <= index; i++)
increases[i].classList.add("hover");
} else {
container.value.classList.remove("show");
}
}
const bounce = async () => {
container.value.classList.remove("bounce");
await nextFrameAsync();
container.value.classList.add("bounce");
}
/**
* Init click events
* @param {HTMLElement} button
* @param {Number} step
*/
const initClick = (button, step) => {
let holding = false;
let timeout = undefined;
let interval = undefined;
const reset = () => {
holding = false;
clearTimeout(timeout);
clearInterval(interval);
timeout = undefined;
interval = undefined;
}
button.addEventListener("mousedown", () => {
onInput(step);
bounce(button);
holding = true;
timeout = setTimeout(() => {
if (!holding) {
reset();
return;
}
interval = setInterval(() => {
onInput(step);
bounce(button);
}, holdInterval);
}, 500);
});
window.addEventListener("mouseup", () => reset());
}
// Decrease buttons
for (let [i, step] of steps.reverse().entries()) {
step = (typeof step === "number")
? -step
: (step[0] === "x" ? step.replace("x", "/") : `-${step}`);
let button = document.createElement("span");
button.dataset.index = i;
button.dataset.value = step;
container.decrease.appendChild(button);
let index = decreases.push(button) - 1;
button.addEventListener("mouseenter", () => hoverD(index, step));
initClick(button, step);
}
// Increase buttons
for (let [i, step] of steps.reverse().entries()) {
let button = document.createElement("span");
button.dataset.index = steps.length - i - 1;
button.dataset.value = step;
container.increase.appendChild(button);
let index = increases.push(button) - 1;
button.addEventListener("mouseenter", () => hoverI(index, step));
initClick(button, step);
}
container.decrease.addEventListener("mouseleave", () => hoverD(-1));
container.increase.addEventListener("mouseleave", () => hoverI(-1));
container.addEventListener("mouseleave", () => container.value.classList.remove("bounce"));
return {
container
}
},
initDbRulers() {
emptyNode(this.meters.ruler);
emptyNode(this.monitors.left.db);
emptyNode(this.monitors.right.db);
let total = this.METER_MAX - this.METER_MIN;
let addToMonitors = false;
// Generate ruler
for (let i = this.METER_MIN; i <= this.METER_MAX; i += 1) {
addToMonitors = false;
let node = document.createElement("div");
node.style.bottom = `${(Math.abs(i - this.METER_MIN) / total) * 100}%`;
if (i === this.METER_MIN) {
node.innerText = `db`;
node.classList.add("step");
addToMonitors = true;
}
if (i % this.METER_STEP === 0) {
node.innerText = i;
node.classList.add("step");
addToMonitors = true;
}
if (i % this.METER_LINE === 0) {
node.classList.add("line");
addToMonitors = true;
}
this.meters.ruler.appendChild(node);
if (addToMonitors) {
this.monitors.left.db.appendChild(node.cloneNode(true));
this.monitors.right.db.appendChild(node.cloneNode(true));
}
}
},
async initSounds() {
let promises = []
for (let [key, value] of Object.entries(this.sounds)) {
let rl, el;
promises.push(new Promise((resolve, reject) => {
this.sounds[key] = new Audio(value);
this.sounds[key].addEventListener("error", el = (e) => {
this.log("ERRR", `Error loading sound: ${value}`, e);
reject({ code: -1, description: `Cannot load sound ${value}`, data: e });
});
this.sounds[key].addEventListener("canplaythrough", rl = () => {
this.log("OKAY", `Loaded sound ${value}`);
this.sounds[key].removeEventListener("canplaythrough", rl);
this.sounds[key].removeEventListener("error", el);
resolve();
});
}));
}
await Promise.all(promises);
},
/**
* Play a sound
* @param {HTMLAudioElement} sound
*/
playSound(sound) {
if (!sound.paused) {
// Clone and play
sound.cloneNode().play();
return;
}
sound.play();
},
/**
* Prepare an audio/video file
* @param {String|File} file
*/
async load(file) {
if (this.loading)
throw { code: -1, description: `metronome.load(): another audio/video is already loading!` }
this.loading = true;
this.log("INFO", `loading`, file);
if (this.playing)
await this.pause();
if (this.audio.instance && this.audio.instance.tagName === "VIDEO") {
this.monitors.removeChild(this.audio.instance);
this.audio.instance = undefined;
}
this.audio.context = new AudioContext();
try {
if (typeof file === "string") {
let response = await fetch(file);
if (!response.ok)
throw response;
let clone = response.clone();
let url = URL.createObjectURL(await clone.blob());
this.audio.buffer = await this.audio.context.decodeAudioData(await response.arrayBuffer());
if (file.endsWith("mp4") || file.endsWith("webm")) {
this.audio.instance = document.createElement("video");
this.audio.instance.src = url;
this.monitors.appendChild(this.audio.instance);
} else
this.audio.instance = new Audio(url);
} else {
let reader = new FileReader();
reader.readAsArrayBuffer(file);
let buffer = await new Promise((resolve, reject) => {
reader.addEventListener("error", (e) => reject(e));
reader.addEventListener("loadend", () => resolve(reader.result));
});
this.audio.buffer = await this.audio.context.decodeAudioData(buffer);
let url = URL.createObjectURL(file);
if (file.type.startsWith("video")) {
this.audio.instance = document.createElement("video");
this.audio.instance.src = url;
this.monitors.appendChild(this.audio.instance);
} else
this.audio.instance = new Audio(url);
}
} catch(error) {
let e = { code: -1, description: `failed to load audio/video file "${file}"`, data: error }
errorHandler(e);
this.loading = false;
throw e;
}
// Check audio not fully loaded
if (this.audio.instance.readyState < 4) {
this.log("INFO", "Audio/video is not fully loaded, wait for it to fully load...");
await new Promise((resolve) => {
this.log("OKAY", "Audio/video loaded.");
this.audio.instance.addEventListener("canplaythrough", () => resolve());
});
}
this.audio.duration = this.audio.instance.duration;
this.clearLabels();
this.sampleDataPoints();
this.renderTicks();
this.resetMonitors();
await this.audioInit();
this.reset();
// Render progress's canvas
this.drawWaveform(this.timeline.graph.progress.canvas, 0, this.audio.duration);
this.time = 0;
this.renderComparator(0);
this.loading = false;
},
async audioInit() {
this.audio.splitter = this.audio.context.createChannelSplitter(2);
this.audio.left = this.audio.context.createAnalyser();
this.audio.right = this.audio.context.createAnalyser();
this.audio.left.fftSize = 128;
this.audio.right.fftSize = 128;
this.audio.leftData = new Float32Array(this.audio.left.frequencyBinCount);
this.audio.rightData = new Float32Array(this.audio.right.frequencyBinCount);
this.audio.leftFreqs = new Float32Array(this.audio.left.frequencyBinCount);
this.audio.rightFreqs = new Float32Array(this.audio.right.frequencyBinCount);
let source = this.audio.context.createMediaElementSource(this.audio.instance);
this.audio.splitter.connect(this.audio.left, 0, 0);
this.audio.splitter.connect(this.audio.right, 1, 0);
source.connect(this.audio.splitter);
source.connect(this.audio.context.destination);
// Draw monitor's ruler.
this.updateMonitorRulers();
},
sampleDataPoints() {
let start = performance.now();
this.log("INFO", "sampling data points...");
this.audio.points = []
this.audio.reduces = []
let channels = this.audio.buffer.numberOfChannels > 1
? [0, 1] : [0];
for (let c of channels) {
this.audio.points[c] = [];
let max = 0;
let value;
let raw = this.audio.buffer.getChannelData(c);