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putting it all together

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or-else
2022-03-15 18:20:24 -07:00
parent 2ab56887b7
commit e121b1645f
21 changed files with 461 additions and 168 deletions
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src/widgets/audio-player.jsx
+115 -41
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@@ -1,6 +1,7 @@
// Audio recorder widget.
import React from 'react';
import { FormattedMessage } from 'react-intl';
import { secondsToTime } from '../lib/strformat';
import { base64ToIntArray } from '../lib/blob-helpers';
@@ -11,9 +12,10 @@ const CANVAS_UPSCALING = 2.0;
const LINE_WIDTH = 3 * CANVAS_UPSCALING;
// Spacing between two visualization bars.
const SPACING = 2 * CANVAS_UPSCALING;
// Color of histogram bars
const BAR_COLOR = '#8fbed6';
const BAR_COLOR_DARK = '#5f8ea5';
// Color of histogram bars (base color #009688).
const BAR_COLOR = '#85c7c5';
const BAR_COLOR_DARK = '#559695';
const THUMB_COLOR = '#246867';
// Background color
const BKG_COLOR = '#fff';
@@ -37,6 +39,8 @@ export default class AudioPlayer extends React.PureComponent {
preview: preview
};
this.initAudio = this.initAudio.bind(this);
this.initCanvas = this.initCanvas.bind(this);
this.calcPreviewBars = this.calcPreviewBars.bind(this);
this.visualize = this.visualize.bind(this);
@@ -52,60 +56,109 @@ export default class AudioPlayer extends React.PureComponent {
componentDidMount() {
if (this.props.src) {
this.audioPlayer = new Audio(this.props.src);
this.audioPlayer.addEventListener('canplay', _ => this.setState({canPlay: true}));
this.audioPlayer.addEventListener('timeupdate', _ => this.setState({currentTime: secondsToTime(this.audioPlayer.currentTime)}));
this.audioPlayer.addEventListener('ended', _ => this.setState({playing: false, currentTime: secondsToTime(0)}));
this.initAudio();
}
if (this.state.preview) {
// Force canvas aspect ration to match one of the element + upscale canvas to reduce blurring.
this.canvasRef.current.width = this.canvasRef.current.offsetWidth * CANVAS_UPSCALING;
this.canvasRef.current.height = this.canvasRef.current.offsetHeight * CANVAS_UPSCALING;
this.canvasContext = this.canvasRef.current.getContext('2d');
this.canvasContext.lineCap = 'round';
this.viewBuffer = this.calcPreviewBars(this.state.preview);
this.visualize();
this.initCanvas();
}
}
componentWillUnmount() {
if (this.audioPlayer) {
this.audioPlayer.oncanplay = null;
this.audioPlayer.ontimeupdate = null;
this.audioPlayer.onended = null;
this.audioPlayer.pause();
this.audioPlayer = null;
}
}
componentDidUpdate(prevProps) {
if (this.props.src != prevProps.src) {
this.initAudio();
}
if (this.props.preview != prevProps.preview) {
let preview = base64ToIntArray(this.props.preview);
if (Array.isArray(preview) && preview.length < MIN_PREVIEW_LENGTH) {
preview = null;
}
this.setState({preview: preview}, this.initCanvas);
}
}
initAudio() {
this.audioPlayer = new Audio(this.props.src);
this.audioPlayer.oncanplay = _ => this.setState({canPlay: true});
this.audioPlayer.ontimeupdate = _ => this.setState({currentTime: secondsToTime(this.audioPlayer.currentTime)});
this.audioPlayer.onended = _ => {
this.audioPlayer.currentTime = 0;
this.setState({playing: false, currentTime: secondsToTime(0)})
}
}
initCanvas() {
// Force canvas aspect ration to match one of the element + upscale canvas to reduce blurring.
this.canvasRef.current.width = this.canvasRef.current.offsetWidth * CANVAS_UPSCALING;
this.canvasRef.current.height = this.canvasRef.current.offsetHeight * CANVAS_UPSCALING;
this.canvasContext = this.canvasRef.current.getContext('2d');
this.canvasContext.lineCap = 'round';
this.viewBuffer = this.calcPreviewBars(this.state.preview);
this.visualize();
}
// Draw amplitude of sound.
visualize() {
const width = this.canvasRef.current.width;
const width = this.effectiveWidth;
const height = this.canvasRef.current.height;
this.canvasContext.lineWidth = LINE_WIDTH;
const drawFrame = () => {
this.canvasContext.clearRect(0, 0, width, height);
if (!this.canvasRef.current) {
// The component is unmounted.
return;
}
// Start new drawing.
this.canvasContext.beginPath();
this.canvasContext.clearRect(0, 0, this.canvasRef.current.width, height);
if (this.viewBuffer) {
window.requestAnimationFrame(drawFrame);
if (this.state.playing) {
window.requestAnimationFrame(drawFrame);
}
// Current pplayback position.
const thumbAt = this.props.duration ?
Math.max(0, Math.min(this.audioPlayer.currentTime * 1000 / this.props.duration, 1)) * (width - LINE_WIDTH * 2) : -1;
this.canvasContext.strokeStyle = BAR_COLOR;
// Draw amplitude bars.
this.canvasContext.beginPath();
this.canvasContext.strokeStyle = BAR_COLOR_DARK;
for (let i = 0; i < this.viewBuffer.length; i++) {
let x = 1 + i * (LINE_WIDTH + SPACING) + LINE_WIDTH * 0.5;
let y = this.viewBuffer[i] * height * 0.9;
const color = x < thumbAt ? BAR_COLOR_DARK : BAR_COLOR;
if (this.canvasContext.strokeStyle != color) {
this.canvasContext.stroke();
this.canvasContext.beginPath();
this.canvasContext.strokeStyle = color;
}
this.canvasContext.moveTo(x, (height - y) * 0.5);
this.canvasContext.lineTo(x, height * 0.5 + y * 0.5);
}
// Actually draw the bars on canvas.
this.canvasContext.stroke();
// Draw thumb.
if (this.props.duration) {
this.canvasContext.beginPath();
const x = Math.max(0, Math.min(this.audioPlayer.currentTime * 1000 / this.props.duration, 1)) * width;
this.canvasContext.arc(x + LINE_WIDTH * 0.5, height * 0.5, LINE_WIDTH * 2, 0, 2 * Math.PI);
this.canvasContext.fillStyle = BAR_COLOR_DARK;
this.canvasContext.arc(thumbAt + LINE_WIDTH * 2, height * 0.5, LINE_WIDTH * 2, 0, 2 * Math.PI);
this.canvasContext.fillStyle = THUMB_COLOR;
this.canvasContext.fill();
}
}
@@ -116,7 +169,7 @@ export default class AudioPlayer extends React.PureComponent {
// Quick and dirty downsampling of the original preview bars into a smaller (or equal) number of bars we can display here.
calcPreviewBars(original) {
const barCount = Math.min(original.length, ((this.canvasRef.current.width - 1) / (LINE_WIDTH + SPACING)) | 0);
const barCount = Math.min(original.length, ((this.canvasRef.current.width - SPACING) / (LINE_WIDTH + SPACING)) | 0);
const factor = original.length / barCount;
let amps = [];
let max = -1;
@@ -132,6 +185,8 @@ export default class AudioPlayer extends React.PureComponent {
}
if (max > 0) {
// Remove extra padding on the right due to fractional bar which is not drawn.
this.effectiveWidth = barCount * (LINE_WIDTH + SPACING) + SPACING;
return amps.map(a => a / max);
}
return null;
@@ -144,12 +199,11 @@ export default class AudioPlayer extends React.PureComponent {
}
if (this.state.playing) {
this.audioPlayer.pause();
this.startedOn = null;
this.setState({playing: false});
} else {
this.audioPlayer.play();
this.startedOn = Date.now();
this.setState({playing: true}, this.visualize);
}
this.setState({playing: !this.state.playing});
}
handleError(err) {
@@ -160,27 +214,47 @@ export default class AudioPlayer extends React.PureComponent {
e.preventDefault();
if (e.target && this.props.duration) {
const rect = e.target.getBoundingClientRect();
const offset = (e.clientX - rect.left) / rect.width;
const offset = (e.clientX - rect.left) / this.effectiveWidth * CANVAS_UPSCALING;
this.audioPlayer.currentTime = this.props.duration * offset / 1000;
this.setState({currentTime: secondsToTime(this.audioPlayer.currentTime)});
if (!this.state.playing && this.state.preview) {
this.visualize();
}
}
}
render() {
const playClass = 'material-icons large' + (this.state.canPlay ? '' : ' disabled');
return (
<div className="audio-player">
<a href="#" onClick={this.handlePlay} title="Play">
<i className={playClass}>{this.state.playing ? 'pause_circle' : 'play_circle'}</i>
</a>
const playClass = 'material-icons' +
(this.props.short ? '' : ' large') +
(this.state.canPlay ? '' : ' disabled');
const play = (<a href="#" onClick={this.handlePlay} title="Play">
<i className={playClass}>{this.state.playing ? 'pause_circle' : 'play_circle'}</i>
</a>);
return (<div className="audio-player">{this.props.short ?
<>
<div>
{this.state.preview ?
<canvas className="visualiser" ref={this.canvasRef} onClick={this.handleSeek} /> :
<div className="visualiser">unavailable</div>
<div className="visualiser"> - </div>
}
</div>
{play}
</>
:
<>
{play}
<div>
{this.state.preview ?
<canvas className="visualiser" ref={this.canvasRef} onClick={this.handleSeek} /> :
<div className="visualiser">
<FormattedMessage
id="preview_unavailable" defaultMessage="unavailable" description="Message shown when media preview is not available" />
</div>
}
<div className="timer">{this.state.currentTime}/{this.state.duration}</div>
</div>
</div>
);
</>
}
</div>);
}
}