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renderer.ts
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renderer.ts
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import { makeDraggable } from './draggable.js'
import EventEmitter from './event-emitter.js'
import type { WaveSurferOptions } from './wavesurfer.js'
type RendererEvents = {
click: [relativeX: number, relativeY: number]
dblclick: [relativeX: number, relativeY: number]
drag: [relativeX: number]
dragstart: [relativeX: number]
dragend: [relativeX: number]
scroll: [relativeStart: number, relativeEnd: number]
render: []
rendered: []
}
class Renderer extends EventEmitter<RendererEvents> {
private static MAX_CANVAS_WIDTH = 4000
private options: WaveSurferOptions
private parent: HTMLElement
private container: HTMLElement
private scrollContainer: HTMLElement
private wrapper: HTMLElement
private canvasWrapper: HTMLElement
private progressWrapper: HTMLElement
private cursor: HTMLElement
private timeouts: Array<() => void> = []
private isScrollable = false
private audioData: AudioBuffer | null = null
private resizeObserver: ResizeObserver | null = null
private lastContainerWidth = 0
private isDragging = false
private subscriptions: (() => void)[] = []
constructor(options: WaveSurferOptions, audioElement?: HTMLElement) {
super()
this.subscriptions = []
this.options = options
const parent = this.parentFromOptionsContainer(options.container)
this.parent = parent
const [div, shadow] = this.initHtml()
parent.appendChild(div)
this.container = div
this.scrollContainer = shadow.querySelector('.scroll') as HTMLElement
this.wrapper = shadow.querySelector('.wrapper') as HTMLElement
this.canvasWrapper = shadow.querySelector('.canvases') as HTMLElement
this.progressWrapper = shadow.querySelector('.progress') as HTMLElement
this.cursor = shadow.querySelector('.cursor') as HTMLElement
if (audioElement) {
shadow.appendChild(audioElement)
}
this.initEvents()
}
private parentFromOptionsContainer(container: WaveSurferOptions['container']) {
let parent
if (typeof container === 'string') {
parent = document.querySelector(container) satisfies HTMLElement | null
} else if (container instanceof HTMLElement) {
parent = container
}
if (!parent) {
throw new Error('Container not found')
}
return parent
}
private initEvents() {
const getClickPosition = (e: MouseEvent): [number, number] => {
const rect = this.wrapper.getBoundingClientRect()
const x = e.clientX - rect.left
const y = e.clientX - rect.left
const relativeX = x / rect.width
const relativeY = y / rect.height
return [relativeX, relativeY]
}
// Add a click listener
this.wrapper.addEventListener('click', (e) => {
const [x, y] = getClickPosition(e)
this.emit('click', x, y)
})
// Add a double click listener
this.wrapper.addEventListener('dblclick', (e) => {
const [x, y] = getClickPosition(e)
this.emit('dblclick', x, y)
})
// Drag
if (this.options.dragToSeek === true || typeof this.options.dragToSeek === 'object') {
this.initDrag()
}
// Add a scroll listener
this.scrollContainer.addEventListener('scroll', () => {
const { scrollLeft, scrollWidth, clientWidth } = this.scrollContainer
const startX = scrollLeft / scrollWidth
const endX = (scrollLeft + clientWidth) / scrollWidth
this.emit('scroll', startX, endX)
})
// Re-render the waveform on container resize
const delay = this.createDelay(100)
this.resizeObserver = new ResizeObserver(() => {
delay()
.then(() => this.onContainerResize())
.catch(() => undefined)
})
this.resizeObserver.observe(this.scrollContainer)
}
private onContainerResize() {
const width = this.parent.clientWidth
if (width === this.lastContainerWidth && this.options.height !== 'auto') return
this.lastContainerWidth = width
this.reRender()
}
private initDrag() {
this.subscriptions.push(
makeDraggable(
this.wrapper,
// On drag
(_, __, x) => {
this.emit('drag', Math.max(0, Math.min(1, x / this.wrapper.getBoundingClientRect().width)))
},
// On start drag
(x) => {
this.isDragging = true
this.emit('dragstart', Math.max(0, Math.min(1, x / this.wrapper.getBoundingClientRect().width)))
},
// On end drag
(x) => {
this.isDragging = false
this.emit('dragend', Math.max(0, Math.min(1, x / this.wrapper.getBoundingClientRect().width)))
},
),
)
}
private getHeight(optionsHeight?: WaveSurferOptions['height']): number {
const defaultHeight = 128
if (optionsHeight == null) return defaultHeight
if (!isNaN(Number(optionsHeight))) return Number(optionsHeight)
if (optionsHeight === 'auto') return this.parent.clientHeight || defaultHeight
return defaultHeight
}
private initHtml(): [HTMLElement, ShadowRoot] {
const div = document.createElement('div')
const shadow = div.attachShadow({ mode: 'open' })
shadow.innerHTML = `
<style>
:host {
user-select: none;
min-width: 1px;
}
:host audio {
display: block;
width: 100%;
}
:host .scroll {
overflow-x: auto;
overflow-y: hidden;
width: 100%;
position: relative;
}
:host .noScrollbar {
scrollbar-color: transparent;
scrollbar-width: none;
}
:host .noScrollbar::-webkit-scrollbar {
display: none;
-webkit-appearance: none;
}
:host .wrapper {
position: relative;
overflow: visible;
z-index: 2;
}
:host .canvases {
min-height: ${this.getHeight(this.options.height)}px;
}
:host .canvases > div {
position: relative;
}
:host canvas {
display: block;
position: absolute;
top: 0;
image-rendering: pixelated;
}
:host .progress {
pointer-events: none;
position: absolute;
z-index: 2;
top: 0;
left: 0;
width: 0;
height: 100%;
overflow: hidden;
}
:host .progress > div {
position: relative;
}
:host .cursor {
pointer-events: none;
position: absolute;
z-index: 5;
top: 0;
left: 0;
height: 100%;
border-radius: 2px;
}
</style>
<div class="scroll" part="scroll">
<div class="wrapper" part="wrapper">
<div class="canvases" part="canvases"></div>
<div class="progress" part="progress"></div>
<div class="cursor" part="cursor"></div>
</div>
</div>
`
return [div, shadow]
}
/** Wavesurfer itself calls this method. Do not call it manually. */
setOptions(options: WaveSurferOptions) {
if (this.options.container !== options.container) {
const newParent = this.parentFromOptionsContainer(options.container)
newParent.appendChild(this.container)
this.parent = newParent
}
if (options.dragToSeek === true || typeof this.options.dragToSeek === 'object') {
this.initDrag()
}
this.options = options
// Re-render the waveform
this.reRender()
}
getWrapper(): HTMLElement {
return this.wrapper
}
getScroll(): number {
return this.scrollContainer.scrollLeft
}
private setScroll(pixels: number) {
this.scrollContainer.scrollLeft = pixels
}
setScrollPercentage(percent: number) {
const { scrollWidth } = this.scrollContainer
const scrollStart = scrollWidth * percent
this.setScroll(scrollStart)
}
destroy() {
this.subscriptions.forEach((unsubscribe) => unsubscribe())
this.container.remove()
this.resizeObserver?.disconnect()
}
private createDelay(delayMs = 10): () => Promise<void> {
let timeout: ReturnType<typeof setTimeout> | undefined
let reject: (() => void) | undefined
const onClear = () => {
if (timeout) clearTimeout(timeout)
if (reject) reject()
}
this.timeouts.push(onClear)
return () => {
return new Promise((resolveFn, rejectFn) => {
onClear()
reject = rejectFn
timeout = setTimeout(() => {
timeout = undefined
reject = undefined
resolveFn()
}, delayMs)
})
}
}
// Convert array of color values to linear gradient
private convertColorValues(color?: WaveSurferOptions['waveColor']): string | CanvasGradient {
if (!Array.isArray(color)) return color || ''
if (color.length < 2) return color[0] || ''
const canvasElement = document.createElement('canvas')
const ctx = canvasElement.getContext('2d') as CanvasRenderingContext2D
const gradientHeight = canvasElement.height * (window.devicePixelRatio || 1)
const gradient = ctx.createLinearGradient(0, 0, 0, gradientHeight)
const colorStopPercentage = 1 / (color.length - 1)
color.forEach((color, index) => {
const offset = index * colorStopPercentage
gradient.addColorStop(offset, color)
})
return gradient
}
private renderBarWaveform(
channelData: Array<Float32Array | number[]>,
options: WaveSurferOptions,
ctx: CanvasRenderingContext2D,
vScale: number,
) {
const topChannel = channelData[0]
const bottomChannel = channelData[1] || channelData[0]
const length = topChannel.length
const { width, height } = ctx.canvas
const halfHeight = height / 2
const pixelRatio = window.devicePixelRatio || 1
const barWidth = options.barWidth ? options.barWidth * pixelRatio : 1
const barGap = options.barGap ? options.barGap * pixelRatio : options.barWidth ? barWidth / 2 : 0
const barRadius = options.barRadius || 0
const barIndexScale = width / (barWidth + barGap) / length
const rectFn = barRadius && 'roundRect' in ctx ? 'roundRect' : 'rect'
ctx.beginPath()
let prevX = 0
let maxTop = 0
let maxBottom = 0
for (let i = 0; i <= length; i++) {
const x = Math.round(i * barIndexScale)
if (x > prevX) {
const topBarHeight = Math.round(maxTop * halfHeight * vScale)
const bottomBarHeight = Math.round(maxBottom * halfHeight * vScale)
const barHeight = topBarHeight + bottomBarHeight || 1
// Vertical alignment
let y = halfHeight - topBarHeight
if (options.barAlign === 'top') {
y = 0
} else if (options.barAlign === 'bottom') {
y = height - barHeight
}
ctx[rectFn](prevX * (barWidth + barGap), y, barWidth, barHeight, barRadius)
prevX = x
maxTop = 0
maxBottom = 0
}
const magnitudeTop = Math.abs(topChannel[i] || 0)
const magnitudeBottom = Math.abs(bottomChannel[i] || 0)
if (magnitudeTop > maxTop) maxTop = magnitudeTop
if (magnitudeBottom > maxBottom) maxBottom = magnitudeBottom
}
ctx.fill()
ctx.closePath()
}
private renderLineWaveform(
channelData: Array<Float32Array | number[]>,
_options: WaveSurferOptions,
ctx: CanvasRenderingContext2D,
vScale: number,
) {
const drawChannel = (index: number) => {
const channel = channelData[index] || channelData[0]
const length = channel.length
const { height } = ctx.canvas
const halfHeight = height / 2
const hScale = ctx.canvas.width / length
ctx.moveTo(0, halfHeight)
let prevX = 0
let max = 0
for (let i = 0; i <= length; i++) {
const x = Math.round(i * hScale)
if (x > prevX) {
const h = Math.round(max * halfHeight * vScale) || 1
const y = halfHeight + h * (index === 0 ? -1 : 1)
ctx.lineTo(prevX, y)
prevX = x
max = 0
}
const value = Math.abs(channel[i] || 0)
if (value > max) max = value
}
ctx.lineTo(prevX, halfHeight)
}
ctx.beginPath()
drawChannel(0)
drawChannel(1)
ctx.fill()
ctx.closePath()
}
private renderWaveform(
channelData: Array<Float32Array | number[]>,
options: WaveSurferOptions,
ctx: CanvasRenderingContext2D,
) {
ctx.fillStyle = this.convertColorValues(options.waveColor)
// Custom rendering function
if (options.renderFunction) {
options.renderFunction(channelData, ctx)
return
}
// Vertical scaling
let vScale = options.barHeight || 1
if (options.normalize) {
const max = Array.from(channelData[0]).reduce((max, value) => Math.max(max, Math.abs(value)), 0)
vScale = max ? 1 / max : 1
}
// Render waveform as bars
if (options.barWidth || options.barGap || options.barAlign) {
this.renderBarWaveform(channelData, options, ctx, vScale)
return
}
// Render waveform as a polyline
this.renderLineWaveform(channelData, options, ctx, vScale)
}
private renderSingleCanvas(
channelData: Array<Float32Array | number[]>,
options: WaveSurferOptions,
width: number,
height: number,
start: number,
end: number,
canvasContainer: HTMLElement,
progressContainer: HTMLElement,
) {
const pixelRatio = window.devicePixelRatio || 1
const canvas = document.createElement('canvas')
const length = channelData[0].length
canvas.width = Math.round((width * (end - start)) / length)
canvas.height = height * pixelRatio
canvas.style.width = `${Math.floor(canvas.width / pixelRatio)}px`
canvas.style.height = `${height}px`
canvas.style.left = `${Math.floor((start * width) / pixelRatio / length)}px`
canvasContainer.appendChild(canvas)
const ctx = canvas.getContext('2d') as CanvasRenderingContext2D
this.renderWaveform(
channelData.map((channel) => channel.slice(start, end)),
options,
ctx,
)
// Draw a progress canvas
if (canvas.width > 0 && canvas.height > 0) {
const progressCanvas = canvas.cloneNode() as HTMLCanvasElement
const progressCtx = progressCanvas.getContext('2d') as CanvasRenderingContext2D
progressCtx.drawImage(canvas, 0, 0)
// Set the composition method to draw only where the waveform is drawn
progressCtx.globalCompositeOperation = 'source-in'
progressCtx.fillStyle = this.convertColorValues(options.progressColor)
// This rectangle acts as a mask thanks to the composition method
progressCtx.fillRect(0, 0, canvas.width, canvas.height)
progressContainer.appendChild(progressCanvas)
}
}
private async renderChannel(
channelData: Array<Float32Array | number[]>,
{ overlay, ...options }: WaveSurferOptions & { overlay?: boolean },
width: number,
channelIndex: number,
): Promise<void> {
// A container for canvases
const canvasContainer = document.createElement('div')
const height = this.getHeight(options.height)
canvasContainer.style.height = `${height}px`
if (overlay && channelIndex > 0) {
canvasContainer.style.marginTop = `-${height}px`
}
this.canvasWrapper.style.minHeight = `${height}px`
this.canvasWrapper.appendChild(canvasContainer)
// A container for progress canvases
const progressContainer = canvasContainer.cloneNode() as HTMLElement
this.progressWrapper.appendChild(progressContainer)
const dataLength = channelData[0].length
// Draw a portion of the waveform from start peak to end peak
const draw = (start: number, end: number) => {
this.renderSingleCanvas(
channelData,
options,
width,
height,
Math.max(0, start),
Math.min(end, dataLength),
canvasContainer,
progressContainer,
)
}
// Draw the entire waveform
if (!this.isScrollable) {
draw(0, dataLength)
return
}
// Determine the currently visible part of the waveform
const { scrollLeft, scrollWidth, clientWidth } = this.scrollContainer
const scale = dataLength / scrollWidth
let viewportWidth = Math.min(Renderer.MAX_CANVAS_WIDTH, clientWidth)
// Adjust width to avoid gaps between canvases when using bars
if (options.barWidth || options.barGap) {
const barWidth = options.barWidth || 0.5
const barGap = options.barGap || barWidth / 2
const totalBarWidth = barWidth + barGap
if (viewportWidth % totalBarWidth !== 0) {
viewportWidth = Math.floor(viewportWidth / totalBarWidth) * totalBarWidth
}
}
const start = Math.floor(Math.abs(scrollLeft) * scale)
const end = Math.floor(start + viewportWidth * scale)
const viewportLen = end - start
if (viewportLen <= 0) {
return
}
// Draw the visible part of the waveform
draw(start, end)
// Draw the waveform in chunks equal to the size of the viewport, starting from the position of the viewport
await Promise.all([
// Draw the chunks to the left of the viewport
(async () => {
if (start === 0) return
const delay = this.createDelay()
for (let i = start; i >= 0; i -= viewportLen) {
await delay()
draw(Math.max(0, i - viewportLen), i)
}
})(),
// Draw the chunks to the right of the viewport
(async () => {
if (end === dataLength) return
const delay = this.createDelay()
for (let i = end; i < dataLength; i += viewportLen) {
await delay()
draw(i, Math.min(dataLength, i + viewportLen))
}
})(),
])
}
async render(audioData: AudioBuffer) {
// Clear previous timeouts
this.timeouts.forEach((clear) => clear())
this.timeouts = []
// Clear the canvases
this.canvasWrapper.innerHTML = ''
this.progressWrapper.innerHTML = ''
// Width
if (this.options.width != null) {
this.scrollContainer.style.width =
typeof this.options.width === 'number' ? `${this.options.width}px` : this.options.width
}
// Determine the width of the waveform
const pixelRatio = window.devicePixelRatio || 1
const parentWidth = this.scrollContainer.clientWidth
const scrollWidth = Math.ceil(audioData.duration * (this.options.minPxPerSec || 0))
// Whether the container should scroll
this.isScrollable = scrollWidth > parentWidth
const useParentWidth = this.options.fillParent && !this.isScrollable
// Width of the waveform in pixels
const width = (useParentWidth ? parentWidth : scrollWidth) * pixelRatio
// Set the width of the wrapper
this.wrapper.style.width = useParentWidth ? '100%' : `${scrollWidth}px`
// Set additional styles
this.scrollContainer.style.overflowX = this.isScrollable ? 'auto' : 'hidden'
this.scrollContainer.classList.toggle('noScrollbar', !!this.options.hideScrollbar)
this.cursor.style.backgroundColor = `${this.options.cursorColor || this.options.progressColor}`
this.cursor.style.width = `${this.options.cursorWidth}px`
this.audioData = audioData
this.emit('render')
// Render the waveform
try {
if (this.options.splitChannels) {
// Render a waveform for each channel
await Promise.all(
Array.from({ length: audioData.numberOfChannels }).map((_, i) => {
const options = { ...this.options, ...this.options.splitChannels?.[i] }
return this.renderChannel([audioData.getChannelData(i)], options, width, i)
}),
)
} else {
// Render a single waveform for the first two channels (left and right)
const channels = [audioData.getChannelData(0)]
if (audioData.numberOfChannels > 1) channels.push(audioData.getChannelData(1))
await this.renderChannel(channels, this.options, width, 0)
}
} catch {
// Render cancelled due to another render
return
}
this.emit('rendered')
}
reRender() {
// Return if the waveform has not been rendered yet
if (!this.audioData) return
// Remember the current cursor position
const { scrollWidth } = this.scrollContainer
const { right: before } = this.progressWrapper.getBoundingClientRect()
// Re-render the waveform
this.render(this.audioData)
// Adjust the scroll position so that the cursor stays in the same place
if (this.isScrollable && scrollWidth !== this.scrollContainer.scrollWidth) {
const { right: after } = this.progressWrapper.getBoundingClientRect()
let delta = after - before
// to limit compounding floating-point drift
// we need to round to the half px furthest from 0
delta *= 2
delta = delta < 0 ? Math.floor(delta) : Math.ceil(delta)
delta /= 2
this.scrollContainer.scrollLeft += delta
}
}
zoom(minPxPerSec: number) {
this.options.minPxPerSec = minPxPerSec
this.reRender()
}
private scrollIntoView(progress: number, isPlaying = false) {
const { scrollLeft, scrollWidth, clientWidth } = this.scrollContainer
const progressWidth = progress * scrollWidth
const startEdge = scrollLeft
const endEdge = scrollLeft + clientWidth
const middle = clientWidth / 2
if (this.isDragging) {
// Scroll when dragging close to the edge of the viewport
const minGap = 30
if (progressWidth + minGap > endEdge) {
this.scrollContainer.scrollLeft += minGap
} else if (progressWidth - minGap < startEdge) {
this.scrollContainer.scrollLeft -= minGap
}
} else {
if (progressWidth < startEdge || progressWidth > endEdge) {
this.scrollContainer.scrollLeft = progressWidth - (this.options.autoCenter ? middle : 0)
}
// Keep the cursor centered when playing
const center = progressWidth - scrollLeft - middle
if (isPlaying && this.options.autoCenter && center > 0) {
this.scrollContainer.scrollLeft += Math.min(center, 10)
}
}
// Emit the scroll event
{
const newScroll = this.scrollContainer.scrollLeft
const startX = newScroll / scrollWidth
const endX = (newScroll + clientWidth) / scrollWidth
this.emit('scroll', startX, endX)
}
}
renderProgress(progress: number, isPlaying?: boolean) {
if (isNaN(progress)) return
const percents = progress * 100
this.canvasWrapper.style.clipPath = `polygon(${percents}% 0, 100% 0, 100% 100%, ${percents}% 100%)`
this.progressWrapper.style.width = `${percents}%`
this.cursor.style.left = `${percents}%`
this.cursor.style.transform = `translateX(-${Math.round(percents) === 100 ? this.options.cursorWidth : 0}px)`
if (this.isScrollable && this.options.autoScroll) {
this.scrollIntoView(progress, isPlaying)
}
}
async exportImage(format: string, quality: number, type: 'dataURL' | 'blob'): Promise<string[] | Blob[]> {
const canvases = this.canvasWrapper.querySelectorAll('canvas')
if (!canvases.length) {
throw new Error('No waveform data')
}
// Data URLs
if (type === 'dataURL') {
const images = Array.from(canvases).map((canvas) => canvas.toDataURL(format, quality))
return Promise.resolve(images)
}
// Blobs
return Promise.all(
Array.from(canvases).map((canvas) => {
return new Promise<Blob>((resolve, reject) => {
canvas.toBlob(
(blob) => {
blob ? resolve(blob) : reject(new Error('Could not export image'))
},
format,
quality,
)
})
}),
)
}
}
export default Renderer