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import CanvasEntry from "wavesurfer.js/src/drawer.canvasentry.js"
import MultiCanvas from "wavesurfer.js/src/drawer.multicanvas.js"
import { Channel, PlayerParams } from "../types"
import { waveStyles } from "./styles"
const util: WaveSurfer.WaveSurferUtil = (WaveSurfer as any).default.util
export class Drawer extends MultiCanvas {
container: HTMLElement
channels: Channel[] = []
params: Required<PlayerParams>
cursorCanvas?: HTMLCanvasElement
currentPosition = 0
constructor(container: HTMLElement, params: WaveSurfer.WaveSurferParams) {
super(container, params)
this.container = container
this.params = params as Required<PlayerParams>
window.addEventListener("resize", this.handleWindowResize)
this.hasProgressCanvas = true
}
public init() {
super.createWrapper()
this.createElements()
}
private handleWindowResize = () => {
this.fireEvent("redraw")
}
public destroy = () => {
window.removeEventListener("resize", this.handleWindowResize)
this.destroyCursor()
}
public createElements() {
this.progressWave = this.wrapper.appendChild(
this.style(document.createElement("wave"), waveStyles)
) as HTMLDivElement
this.addCanvas()
this.createCursor()
this.wrapper.style.backgroundColor = this.params.backgroundColor
this.container.style.position = "relative"
this.container.style.backgroundColor = "transparent"
}
public drawBars(
peaks: number[][],
channelIndex: number,
start?: number,
end?: number
) {
// if drawBars was called within ws.empty we don't pass a start and
// don't want anything to happen
if (start === undefined || end === undefined) {
return
}
return util.frame(this.prepareForDraw.bind(this))(peaks, start, end)
}
private preparePeaks(peaks: ReadonlyArray<ReadonlyArray<number>>) {
// In case the peaks are generated by Wavesurfer, every second entry is a negative number,
// because it is intended to describe a wave going up and down.
// We just filter out the negative numbers in that case.
const hasMinVals = peaks.some((channelPeaks: readonly number[]) =>
channelPeaks.some(val => val < 0)
)
Iif (hasMinVals) {
return peaks.map(peaks => (peaks as number[]).filter((_, i) => !(i % 2)))
}
return peaks
}
private prepareBars({
start,
end,
step,
peaks,
}: {
start: number
end: number
step: number
peaks: ReadonlyArray<ReadonlyArray<number>>
}) {
const scale = peaks[0].length / this.width
const bars: number[][] = [...new Array(peaks.length)].map(() => [])
let i = start
for (i; i < end; i += step) {
const peakIndex = Math.floor(i * scale)
const heights = peaks.map(p =>
this.getPeakAverageValue(p, peakIndex, step)
)
heights.forEach((h, i) => bars[i].push(h))
}
if (this.params.normalize) {
return this.normalizeBars(bars)
}
return bars
}
private prepareProgressBars({
start,
end,
step,
}: {
start: number
end: number
step: number
}) {
let i = start
const heights = []
for (i; i < end; i += step) {
heights.push(0.5)
}
return [heights]
}
private normalizeBars(bars: ReadonlyArray<ReadonlyArray<number>>) {
// We normalize each channel on its own
return bars.map(barsForChannel => {
const max = util.max(barsForChannel)
return barsForChannel.map(val => (this.params.barHeight * val) / max)
})
}
private renderBars({
bars,
start,
step,
}: {
bars: number[][]
start: number
step: number
}) {
const height = this.params.height * this.params.pixelRatio
const halfH = height / 2
const barWidth = Math.floor(this.params.barWidth * this.params.pixelRatio)
let channels = Array.from(bars.keys())
bars[0].forEach((_, index) => {
const i = start + index * step
// If we have multiple channels, we have to make sure we draw the heighest bar first,
// so that it does not cover the smaller ones
channels = channels.sort((a, b) => bars[b][index] - bars[a][index])
channels.forEach(channelIndex => {
let h = Math.round(bars[channelIndex][index] * halfH)
// in case of silences, allow the user to specify that we
// always draw *something* (normally a 1px high bar)
if (h === 0 && this.params.barMinHeight) {
h = this.params.barMinHeight
}
this.fillRect(
channelIndex,
i + this.halfPixel,
this.height - h * 2,
barWidth + this.halfPixel,
h * 2,
0
)
})
})
}
public prepareForDraw(
peaks: ReadonlyArray<ReadonlyArray<number>>,
start: number,
end: number
): void {
const bar = this.params.barWidth * this.params.pixelRatio
const gap =
this.params.barGap === null || this.params.barGap === undefined
? Math.max(this.params.pixelRatio, Math.floor(bar / 2))
: Math.max(
this.params.pixelRatio,
this.params.barGap * this.params.pixelRatio
)
const step = Math.floor(bar + gap)
Iif (!peaks || !peaks.length) {
// Peaks are not available and Wavesurfer is currently generating them.
// We display bars going half way.
const bars = this.prepareProgressBars({
start,
end,
step,
})
this.renderBars({ bars, start, step })
} else {
const processedPeaks = this.preparePeaks(peaks)
const bars = this.prepareBars({
start,
end,
step,
peaks: processedPeaks,
})
this.renderBars({ bars, start, step })
}
}
public fillRect(
channelIndex: number,
x: number,
y: number,
width: number,
height: number,
radius?: number
) {
const startCanvas = Math.floor(x / this.maxCanvasWidth)
const endCanvas = Math.min(
Math.ceil((x + width) / this.maxCanvasWidth) + 1,
this.canvases.length
)
let i = startCanvas
for (i; i < endCanvas; i++) {
const entry = this.canvases[i]
const leftOffset = i * this.maxCanvasWidth
const intersection = {
x1: Math.max(x, i * this.maxCanvasWidth),
y1: y,
x2: Math.min(
x + width,
i * this.maxCanvasWidth + entry.wave!.width // eslint-disable-line @typescript-eslint/no-non-null-assertion
),
y2: y + height,
}
if (intersection.x1 < intersection.x2) {
this.setFillStyles(entry, channelIndex)
entry.fillRects(
intersection.x1 - leftOffset,
intersection.y1,
intersection.x2 - intersection.x1,
intersection.y2 - intersection.y1,
radius
)
}
}
}
public setFillStyles(entry: CanvasEntry, channelIndex: number) {
const channel = this.channels[channelIndex]
const color = (channel && channel.color) || this.params.waveColor
const progressColor =
(channel && channel.progressColor) ||
(channel && channel.color) ||
this.params.progressColor
entry.setFillStyles(color, progressColor)
}
/**
* Get weighted arithmetic mean of peak values in radius surrounding the value at index
* @param {array} peaks Source peak array
* @param {number} index Index of the middle value
* @param {number} radius Radius from the index
* @returns {number} Arithemtic mean of values
*/
public getPeakAverageValue(
peaks: readonly number[],
index: number,
radius: number
) {
if (index < 0) {
return 0
}
let sum = 0
let weightSum = 0
for (
let i = Math.max(0, index - radius);
i <= Math.min(peaks.length - 1, index + radius);
i++
) {
const w = this.weightDistributionFunction(i - index, radius / 2)
sum += w * peaks[i]
weightSum += w
}
if (weightSum === 0) {
return 0
}
const average = sum / weightSum
return average
}
private weightDistributionFunction(x: number, deviation: number) {
if (!deviation) {
return 1
}
return Math.exp(-1 * Math.pow(x / deviation, 2))
}
public createCursor() {
if (this.progressWave) {
if (this.params.progressBackgroundColor) {
this.style(this.progressWave, {
backgroundColor: this.params.progressBackgroundColor,
})
}
this.cursorCanvas = this.style(document.createElement("canvas"), {
position: "absolute",
top: "0",
left: "0",
height: "100%",
width: "100%",
zIndex: "5",
pointerEvents: "none",
}) as HTMLCanvasElement
this.cursorCanvas.classList.add("twilio-player-cursor")
this.container.appendChild(this.cursorCanvas)
const ctx = this.cursorCanvas.getContext("2d")
Eif (ctx) {
ctx.imageSmoothingEnabled = false
this.drawCursor(0)
}
}
}
public destroyCursor() {
Iif (this.cursorCanvas) {
this.cursorCanvas.parentNode?.removeChild(this.cursorCanvas)
this.cursorCanvas = undefined
}
}
public updateProgress(position: number) {
position = Math.floor(position)
if (this.progressWave) {
this.style(this.progressWave, { width: position + "px" })
}
this.drawCursor(position)
}
public drawCursor(position: number) {
if (this.cursorCanvas) {
const ctx = this.cursorCanvas.getContext("2d")
Eif (ctx && this.cursorCanvas) {
ctx.imageSmoothingEnabled = false
this.cursorCanvas.width = this.container.clientWidth
this.cursorCanvas.height = this.container.clientHeight
ctx.clearRect(0, 0, this.cursorCanvas.width, this.cursorCanvas.height)
ctx.fillStyle = this.params.cursorColor
ctx.beginPath()
ctx.moveTo(position - 3 * this.params.cursorWidth + 0.5, -0.5)
ctx.lineTo(position + 0.5, 8.5)
ctx.lineTo(position + 0.5, this.cursorCanvas.height + 0.5)
ctx.lineTo(
position + this.params.cursorWidth + 0.5,
this.cursorCanvas.height + 0.5
)
ctx.lineTo(position + this.params.cursorWidth + 0.5, 8.5)
ctx.lineTo(position + 4 * this.params.cursorWidth + 0.5, -0.5)
ctx.fill()
}
}
}
}
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