hometown/app/javascript/mastodon/features/audio/index.js

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import React from 'react';
import PropTypes from 'prop-types';
import { defineMessages, injectIntl } from 'react-intl';
import { formatTime } from 'mastodon/features/video';
import Icon from 'mastodon/components/icon';
import classNames from 'classnames';
import { throttle } from 'lodash';
import { encode, decode } from 'blurhash';
import { getPointerPosition, fileNameFromURL } from 'mastodon/features/video';
const digitCharacters = [
'0',
'1',
'2',
'3',
'4',
'5',
'6',
'7',
'8',
'9',
'A',
'B',
'C',
'D',
'E',
'F',
'G',
'H',
'I',
'J',
'K',
'L',
'M',
'N',
'O',
'P',
'Q',
'R',
'S',
'T',
'U',
'V',
'W',
'X',
'Y',
'Z',
'a',
'b',
'c',
'd',
'e',
'f',
'g',
'h',
'i',
'j',
'k',
'l',
'm',
'n',
'o',
'p',
'q',
'r',
's',
't',
'u',
'v',
'w',
'x',
'y',
'z',
'#',
'$',
'%',
'*',
'+',
',',
'-',
'.',
':',
';',
'=',
'?',
'@',
'[',
']',
'^',
'_',
'{',
'|',
'}',
'~',
];
const decode83 = (str) => {
let value = 0;
let c, digit;
for (let i = 0; i < str.length; i++) {
c = str[i];
digit = digitCharacters.indexOf(c);
value = value * 83 + digit;
}
return value;
};
const decodeRGB = int => ({
r: Math.max(0, (int >> 16)),
g: Math.max(0, (int >> 8) & 255),
b: Math.max(0, (int & 255)),
});
const luma = ({ r, g, b }) => 0.2126 * r + 0.7152 * g + 0.0722 * b;
const adjustColor = ({ r, g, b }, lumaThreshold = 100) => {
let delta;
if (luma({ r, g, b }) >= lumaThreshold) {
delta = -80;
} else {
delta = 80;
}
return {
r: r + delta,
g: g + delta,
b: b + delta,
};
};
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const messages = defineMessages({
play: { id: 'video.play', defaultMessage: 'Play' },
pause: { id: 'video.pause', defaultMessage: 'Pause' },
mute: { id: 'video.mute', defaultMessage: 'Mute sound' },
unmute: { id: 'video.unmute', defaultMessage: 'Unmute sound' },
download: { id: 'video.download', defaultMessage: 'Download file' },
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});
const TICK_SIZE = 10;
const PADDING = 180;
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export default @injectIntl
class Audio extends React.PureComponent {
static propTypes = {
src: PropTypes.string.isRequired,
alt: PropTypes.string,
poster: PropTypes.string,
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duration: PropTypes.number,
width: PropTypes.number,
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height: PropTypes.number,
editable: PropTypes.bool,
intl: PropTypes.object.isRequired,
cacheWidth: PropTypes.func,
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};
state = {
width: this.props.width,
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currentTime: 0,
buffer: 0,
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duration: null,
paused: true,
muted: false,
volume: 0.5,
dragging: false,
color: { r: 255, g: 255, b: 255 },
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};
setPlayerRef = c => {
this.player = c;
if (c) {
const width = c.offsetWidth;
const height = width / (16/9);
if (this.props.cacheWidth) {
this.props.cacheWidth(width);
}
this.setState({ width, height });
}
}
setSeekRef = c => {
this.seek = c;
}
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setVolumeRef = c => {
this.volume = c;
}
setAudioRef = c => {
this.audio = c;
if (this.audio) {
this.setState({ volume: this.audio.volume, muted: this.audio.muted });
}
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}
setBlurhashCanvasRef = c => {
this.blurhashCanvas = c;
}
setCanvasRef = c => {
this.canvas = c;
if (c) {
this.canvasContext = c.getContext('2d');
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}
}
componentDidMount () {
window.addEventListener('scroll', this.handleScroll);
const img = new Image();
img.crossOrigin = 'anonymous';
img.onload = () => this.handlePosterLoad(img);
img.src = this.props.poster;
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}
componentDidUpdate (prevProps, prevState) {
if (prevProps.poster !== this.props.poster) {
const img = new Image();
img.crossOrigin = 'anonymous';
img.onload = () => this.handlePosterLoad(img);
img.src = this.props.poster;
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}
if (prevState.blurhash !== this.state.blurhash) {
const context = this.blurhashCanvas.getContext('2d');
const pixels = decode(this.state.blurhash, 32, 32);
const outputImageData = new ImageData(pixels, 32, 32);
context.putImageData(outputImageData, 0, 0);
}
this._clear();
this._draw();
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}
componentWillUnmount () {
window.removeEventListener('scroll', this.handleScroll);
}
togglePlay = () => {
if (this.state.paused) {
this.setState({ paused: false }, () => this.audio.play());
} else {
this.setState({ paused: true }, () => this.audio.pause());
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}
}
handlePlay = () => {
this.setState({ paused: false });
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if (this.canvas && !this.audioContext) {
this._initAudioContext();
}
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if (this.audioContext && this.audioContext.state === 'suspended') {
this.audioContext.resume();
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}
this._renderCanvas();
}
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handlePause = () => {
this.setState({ paused: true });
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if (this.audioContext) {
this.audioContext.suspend();
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}
}
handleProgress = () => {
if (this.audio.buffered.length > 0) {
this.setState({ buffer: this.audio.buffered.end(0) / this.audio.duration * 100 });
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}
}
toggleMute = () => {
const muted = !this.state.muted;
this.setState({ muted }, () => {
this.audio.muted = muted;
});
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}
handleVolumeMouseDown = e => {
document.addEventListener('mousemove', this.handleMouseVolSlide, true);
document.addEventListener('mouseup', this.handleVolumeMouseUp, true);
document.addEventListener('touchmove', this.handleMouseVolSlide, true);
document.addEventListener('touchend', this.handleVolumeMouseUp, true);
this.handleMouseVolSlide(e);
e.preventDefault();
e.stopPropagation();
}
handleVolumeMouseUp = () => {
document.removeEventListener('mousemove', this.handleMouseVolSlide, true);
document.removeEventListener('mouseup', this.handleVolumeMouseUp, true);
document.removeEventListener('touchmove', this.handleMouseVolSlide, true);
document.removeEventListener('touchend', this.handleVolumeMouseUp, true);
}
handleMouseDown = e => {
document.addEventListener('mousemove', this.handleMouseMove, true);
document.addEventListener('mouseup', this.handleMouseUp, true);
document.addEventListener('touchmove', this.handleMouseMove, true);
document.addEventListener('touchend', this.handleMouseUp, true);
this.setState({ dragging: true });
this.audio.pause();
this.handleMouseMove(e);
e.preventDefault();
e.stopPropagation();
}
handleMouseUp = () => {
document.removeEventListener('mousemove', this.handleMouseMove, true);
document.removeEventListener('mouseup', this.handleMouseUp, true);
document.removeEventListener('touchmove', this.handleMouseMove, true);
document.removeEventListener('touchend', this.handleMouseUp, true);
this.setState({ dragging: false });
this.audio.play();
}
handleMouseMove = throttle(e => {
const { x } = getPointerPosition(this.seek, e);
const currentTime = Math.floor(this.audio.duration * x);
if (!isNaN(currentTime)) {
this.setState({ currentTime }, () => {
this.audio.currentTime = currentTime;
});
}
}, 60);
handleTimeUpdate = () => {
this.setState({
currentTime: Math.floor(this.audio.currentTime),
duration: Math.floor(this.audio.duration),
});
}
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handleMouseVolSlide = throttle(e => {
const { x } = getPointerPosition(this.volume, e);
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if(!isNaN(x)) {
this.setState({ volume: x }, () => {
this.audio.volume = x;
});
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}
}, 60);
handleScroll = throttle(() => {
if (!this.canvas || !this.audio) {
return;
}
const { top, height } = this.canvas.getBoundingClientRect();
const inView = (top <= (window.innerHeight || document.documentElement.clientHeight)) && (top + height >= 0);
if (!this.state.paused && !inView) {
this.setState({ paused: true }, () => this.audio.pause());
}
}, 150, { trailing: true });
handleMouseEnter = () => {
this.setState({ hovered: true });
}
handleMouseLeave = () => {
this.setState({ hovered: false });
}
_initAudioContext () {
const context = new AudioContext();
const analyser = context.createAnalyser();
const source = context.createMediaElementSource(this.audio);
analyser.smoothingTimeConstant = 0.6;
analyser.fftSize = 2048;
source.connect(analyser);
source.connect(context.destination);
this.audioContext = context;
this.analyser = analyser;
}
handlePosterLoad = image => {
const canvas = document.createElement('canvas');
const context = canvas.getContext('2d');
canvas.width = image.width;
canvas.height = image.height;
context.drawImage(image, 0, 0);
const inputImageData = context.getImageData(0, 0, image.width, image.height);
const blurhash = encode(inputImageData.data, image.width, image.height, 4, 4);
const averageColor = decodeRGB(decode83(blurhash.slice(2, 6)));
this.setState({
blurhash,
color: adjustColor(averageColor),
darkText: luma(averageColor) >= 165,
});
}
handleDownload = () => {
fetch(this.props.src).then(res => res.blob()).then(blob => {
const element = document.createElement('a');
const objectURL = URL.createObjectURL(blob);
element.setAttribute('href', objectURL);
element.setAttribute('download', fileNameFromURL(this.props.src));
document.body.appendChild(element);
element.click();
document.body.removeChild(element);
URL.revokeObjectURL(objectURL);
}).catch(err => {
console.error(err);
});
}
_renderCanvas () {
requestAnimationFrame(() => {
this._clear();
this._draw();
if (!this.state.paused) {
this._renderCanvas();
}
});
}
_clear () {
this.canvasContext.clearRect(0, 0, this.state.width, this.state.height);
}
_draw () {
this.canvasContext.save();
const ticks = this._getTicks(360 * this._getScaleCoefficient(), TICK_SIZE);
ticks.forEach(tick => {
this._drawTick(tick.x1, tick.y1, tick.x2, tick.y2);
});
this.canvasContext.restore();
}
_getRadius () {
return parseInt(((this.state.height || this.props.height) - (PADDING * this._getScaleCoefficient()) * 2) / 2);
}
_getScaleCoefficient () {
return (this.state.height || this.props.height) / 982;
}
_getTicks (count, size, animationParams = [0, 90]) {
const radius = this._getRadius();
const ticks = this._getTickPoints(count);
const lesser = 200;
const m = [];
const bufferLength = this.analyser ? this.analyser.frequencyBinCount : 0;
const frequencyData = new Uint8Array(bufferLength);
const allScales = [];
const scaleCoefficient = this._getScaleCoefficient();
if (this.analyser) {
this.analyser.getByteFrequencyData(frequencyData);
}
ticks.forEach((tick, i) => {
const coef = 1 - i / (ticks.length * 2.5);
let delta = ((frequencyData[i] || 0) - lesser * coef) * scaleCoefficient;
if (delta < 0) {
delta = 0;
}
let k;
if (animationParams[0] <= tick.angle && tick.angle <= animationParams[1]) {
k = radius / (radius - this._getSize(tick.angle, animationParams[0], animationParams[1]) - delta);
} else {
k = radius / (radius - (size + delta));
}
const x1 = tick.x * (radius - size);
const y1 = tick.y * (radius - size);
const x2 = x1 * k;
const y2 = y1 * k;
m.push({ x1, y1, x2, y2 });
if (i < 20) {
let scale = delta / (200 * scaleCoefficient);
scale = scale < 1 ? 1 : scale;
allScales.push(scale);
}
});
const scale = allScales.reduce((pv, cv) => pv + cv, 0) / allScales.length;
return m.map(({ x1, y1, x2, y2 }) => ({
x1: x1,
y1: y1,
x2: x2 * scale,
y2: y2 * scale,
}));
}
_getSize (angle, l, r) {
const scaleCoefficient = this._getScaleCoefficient();
const maxTickSize = TICK_SIZE * 9 * scaleCoefficient;
const m = (r - l) / 2;
const x = (angle - l);
let h;
if (x === m) {
return maxTickSize;
}
const d = Math.abs(m - x);
const v = 40 * Math.sqrt(1 / d);
if (v > maxTickSize) {
h = maxTickSize;
} else {
h = Math.max(TICK_SIZE, v);
}
return h;
}
_getTickPoints (count) {
const PI = 360;
const coords = [];
const step = PI / count;
let rad;
for(let deg = 0; deg < PI; deg += step) {
rad = deg * Math.PI / (PI / 2);
coords.push({ x: Math.cos(rad), y: -Math.sin(rad), angle: deg });
}
return coords;
}
_drawTick (x1, y1, x2, y2) {
const radius = this._getRadius();
const cx = parseInt(this.state.width / 2);
const cy = parseInt(radius + (PADDING * this._getScaleCoefficient()));
const dx1 = parseInt(cx + x1);
const dy1 = parseInt(cy + y1);
const dx2 = parseInt(cx + x2);
const dy2 = parseInt(cy + y2);
const gradient = this.canvasContext.createLinearGradient(dx1, dy1, dx2, dy2);
const mainColor = `rgb(${this.state.color.r}, ${this.state.color.g}, ${this.state.color.b})`;
const lastColor = `rgba(${this.state.color.r}, ${this.state.color.g}, ${this.state.color.b}, 0)`;
gradient.addColorStop(0, mainColor);
gradient.addColorStop(0.6, mainColor);
gradient.addColorStop(1, lastColor);
this.canvasContext.beginPath();
this.canvasContext.strokeStyle = gradient;
this.canvasContext.lineWidth = 2;
this.canvasContext.moveTo(dx1, dy1);
this.canvasContext.lineTo(dx2, dy2);
this.canvasContext.stroke();
}
_getColor () {
return `rgb(${this.state.color.r}, ${this.state.color.g}, ${this.state.color.b})`;
}
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render () {
const { src, intl, alt, editable } = this.props;
const { paused, muted, volume, currentTime, duration, buffer, darkText, dragging } = this.state;
const progress = (currentTime / duration) * 100;
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return (
<div className={classNames('audio-player', { editable, 'with-light-background': darkText })} ref={this.setPlayerRef} style={{ width: '100%', height: this.state.height || this.props.height }} onMouseEnter={this.handleMouseEnter} onMouseLeave={this.handleMouseLeave}>
<audio
src={src}
ref={this.setAudioRef}
preload='none'
onPlay={this.handlePlay}
onPause={this.handlePause}
onProgress={this.handleProgress}
onTimeUpdate={this.handleTimeUpdate}
crossOrigin='anonymous'
/>
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<canvas
className='audio-player__background'
onClick={this.togglePlay}
width='32'
height='32'
style={{ width: this.state.width, height: this.state.height, position: 'absolute', top: 0, left: 0 }}
ref={this.setBlurhashCanvasRef}
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aria-label={alt}
title={alt}
role='button'
tabIndex='0'
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/>
<canvas
className='audio-player__canvas'
width={this.state.width}
height={this.state.height}
style={{ width: '100%', position: 'absolute', top: 0, left: 0, pointerEvents: 'none' }}
ref={this.setCanvasRef}
/>
<img
src={this.props.poster}
alt=''
width={(this._getRadius() - TICK_SIZE) * 2}
height={(this._getRadius() - TICK_SIZE) * 2}
style={{ position: 'absolute', left: parseInt(this.state.width / 2), top: parseInt(this._getRadius() + (PADDING * this._getScaleCoefficient())), transform: 'translate(-50%, -50%)', borderRadius: '50%', pointerEvents: 'none' }}
/>
<div className='video-player__seek' onMouseDown={this.handleMouseDown} ref={this.setSeekRef}>
<div className='video-player__seek__buffer' style={{ width: `${buffer}%` }} />
<div className='video-player__seek__progress' style={{ width: `${progress}%`, backgroundColor: this._getColor() }} />
<span
className={classNames('video-player__seek__handle', { active: dragging })}
tabIndex='0'
style={{ left: `${progress}%`, backgroundColor: this._getColor() }}
/>
</div>
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<div className='video-player__controls active'>
<div className='video-player__buttons-bar'>
<div className='video-player__buttons left'>
<button type='button' title={intl.formatMessage(paused ? messages.play : messages.pause)} aria-label={intl.formatMessage(paused ? messages.play : messages.pause)} onClick={this.togglePlay}><Icon id={paused ? 'play' : 'pause'} fixedWidth /></button>
<button type='button' title={intl.formatMessage(muted ? messages.unmute : messages.mute)} aria-label={intl.formatMessage(muted ? messages.unmute : messages.mute)} onClick={this.toggleMute}><Icon id={muted ? 'volume-off' : 'volume-up'} fixedWidth /></button>
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<div className={classNames('video-player__volume', { active: this.state.hovered })} ref={this.setVolumeRef} onMouseDown={this.handleVolumeMouseDown}>
<div className='video-player__volume__current' style={{ width: `${volume * 100}%`, backgroundColor: this._getColor() }} />
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<span
className={classNames('video-player__volume__handle')}
tabIndex='0'
style={{ left: `${volume * 100}%`, backgroundColor: this._getColor() }}
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/>
</div>
<span className='video-player__time'>
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<span className='video-player__time-current'>{formatTime(currentTime)}</span>
<span className='video-player__time-sep'>/</span>
<span className='video-player__time-total'>{formatTime(this.state.duration || Math.floor(this.props.duration))}</span>
</span>
</div>
<div className='video-player__buttons right'>
<button type='button' title={intl.formatMessage(messages.download)} aria-label={intl.formatMessage(messages.download)} onClick={this.handleDownload}><Icon id='download' fixedWidth /></button>
</div>
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</div>
</div>
</div>
);
}
}