Reformat with prettier
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@ -1,4 +1,4 @@
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import { useEffect, useState, useRef, MouseEvent } from "react";
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import { useEffect, useState, useRef, MouseEvent } from 'react';
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type WaveformProps = {
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audioContext: AudioContext;
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@ -11,7 +11,9 @@ type AudioFile = {
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sampleRate: number;
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};
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export const Waveform: React.FC<WaveformProps> = ({ audioContext }: WaveformProps) => {
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export const Waveform: React.FC<WaveformProps> = ({
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audioContext,
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}: WaveformProps) => {
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const [audioFile, setAudioFile] = useState<AudioFile | null>(null);
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const [currentTime, setCurrentTime] = useState(0);
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const [audio, setAudio] = useState(new Audio());
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@ -20,7 +22,7 @@ export const Waveform: React.FC<WaveformProps> = ({ audioContext }: WaveformProp
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const hudCanvasRef = useRef<HTMLCanvasElement>(null);
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const canvasLogicalWidth = 2000;
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const canvasLogicalHeight = 500;
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const videoID = new URLSearchParams(window.location.search).get("video_id")
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const videoID = new URLSearchParams(window.location.search).get('video_id');
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// helpers
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@ -29,7 +31,7 @@ export const Waveform: React.FC<WaveformProps> = ({ audioContext }: WaveformProp
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const rect = evt.currentTarget.getBoundingClientRect();
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const elementX = evt.clientX - rect.left;
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const canvas = evt.target as HTMLCanvasElement;
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return elementX * canvas.width / rect.width;
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return (elementX * canvas.width) / rect.width;
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};
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const canvasXToFrame = (x: number): number => {
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@ -37,7 +39,7 @@ export const Waveform: React.FC<WaveformProps> = ({ audioContext }: WaveformProp
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return 0;
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}
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return Math.floor((x / canvasLogicalWidth) * audioFile.frames);
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}
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};
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const canvasXToSecs = (x: number): number => {
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if (audioFile == null) {
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@ -45,7 +47,7 @@ export const Waveform: React.FC<WaveformProps> = ({ audioContext }: WaveformProp
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}
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const duration = audioFile.frames / audioFile.sampleRate;
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return (canvasXToFrame(x) / audioFile.frames) * duration;
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}
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};
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const secsToCanvasX = (canvasWidth: number, secs: number): number => {
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if (audioFile == null) {
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@ -60,20 +62,24 @@ export const Waveform: React.FC<WaveformProps> = ({ audioContext }: WaveformProp
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// setup player on page load:
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useEffect(() => {
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(async function () {
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audio.addEventListener("timeupdate", () => { setCurrentTime(audio.currentTime); });
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})()
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audio.addEventListener('timeupdate', () => {
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setCurrentTime(audio.currentTime);
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});
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})();
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}, [audio]);
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// load audio data on page load:
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useEffect(() => {
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(async function () {
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console.log("fetching audio data...");
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console.log('fetching audio data...');
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const resp = await fetch(`http://localhost:8888/api/download?video_id=${videoID}`);
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const resp = await fetch(
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`http://localhost:8888/api/download?video_id=${videoID}`
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);
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const respBody = await resp.json();
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if (respBody.error) {
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console.log("error fetching audio data:", respBody.error)
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console.log('error fetching audio data:', respBody.error);
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return;
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}
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@ -96,17 +102,17 @@ export const Waveform: React.FC<WaveformProps> = ({ audioContext }: WaveformProp
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return;
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}
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console.log("audiofile is", audioFile);
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console.log('audiofile is', audioFile);
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const canvas = waveformCanvasRef.current;
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if (canvas == null) {
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console.error("no canvas ref available");
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console.error('no canvas ref available');
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return;
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}
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const ctx = canvas.getContext("2d");
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const ctx = canvas.getContext('2d');
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if (ctx == null) {
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console.error("no 2d context available");
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console.error('no 2d context available');
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return;
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}
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@ -114,9 +120,13 @@ export const Waveform: React.FC<WaveformProps> = ({ audioContext }: WaveformProp
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ctx.fillStyle = 'black';
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ctx.fillRect(0, 0, canvas.width, canvas.height);
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const resp = await fetch(`http://localhost:8888/api/peaks?video_id=${videoID}&start=0&end=${Math.round(audioFile.frames)}&bins=${canvas.width}`);
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const resp = await fetch(
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`http://localhost:8888/api/peaks?video_id=${videoID}&start=0&end=${Math.round(
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audioFile.frames
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)}&bins=${canvas.width}`
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);
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const peaks = await resp.json();
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console.log("respBody from peaks =", peaks)
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console.log('respBody from peaks =', peaks);
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const numChannels = peaks.length;
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const chanHeight = canvas.height / numChannels;
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@ -125,12 +135,12 @@ export const Waveform: React.FC<WaveformProps> = ({ audioContext }: WaveformProp
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for (let i = 0; i < peaks[c].length; i++) {
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const val = peaks[c][i];
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const height = Math.floor((val / 32768) * chanHeight);
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const y1 = ((chanHeight - height)/2)+yOffset;
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const y1 = (chanHeight - height) / 2 + yOffset;
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const y2 = y1 + height;
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ctx.beginPath();
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ctx.moveTo(i, y1)
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ctx.lineTo(i, y2)
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ctx.stroke()
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ctx.moveTo(i, y1);
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ctx.lineTo(i, y2);
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ctx.stroke();
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}
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}
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})();
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@ -139,16 +149,15 @@ export const Waveform: React.FC<WaveformProps> = ({ audioContext }: WaveformProp
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// redraw HUD
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useEffect(() => {
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(async function () {
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const canvas = hudCanvasRef.current;
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if (canvas == null) {
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console.error("no hud canvas ref available");
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console.error('no hud canvas ref available');
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return;
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}
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const ctx = canvas.getContext("2d");
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const ctx = canvas.getContext('2d');
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if (ctx == null) {
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console.error("no hud 2d context available");
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console.error('no hud 2d context available');
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return;
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}
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@ -156,21 +165,20 @@ export const Waveform: React.FC<WaveformProps> = ({ audioContext }: WaveformProp
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const x = secsToCanvasX(canvas.width, currentTime);
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ctx.strokeStyle = "red";
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ctx.strokeStyle = 'red';
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ctx.beginPath();
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ctx.moveTo(x, 0);
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ctx.lineTo(x, canvas.height);
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ctx.stroke();
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})()
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})();
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}, [currentTime]);
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// callbacks
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const handleMouseMove = (evt: MouseEvent<HTMLCanvasElement>) => {
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const canvasX = mouseEventToCanvasX(evt);
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console.log("mousemove, x =", canvasX, "frame =", canvasXToFrame(canvasX));
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}
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console.log('mousemove, x =', canvasX, 'frame =', canvasXToFrame(canvasX));
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};
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const handleMouseDown = (evt: MouseEvent<HTMLCanvasElement>) => {
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if (audioFile == null) {
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@ -179,7 +187,7 @@ export const Waveform: React.FC<WaveformProps> = ({ audioContext }: WaveformProp
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const canvasX = mouseEventToCanvasX(evt);
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audio.currentTime = canvasXToSecs(canvasX);
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console.log("currentTime now", canvasXToSecs(canvasX));
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console.log('currentTime now', canvasXToSecs(canvasX));
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};
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const handleMouseUp = () => {
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@ -190,34 +198,69 @@ export const Waveform: React.FC<WaveformProps> = ({ audioContext }: WaveformProp
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const url = `http://localhost:8888/api/audio?video_id=${videoID}`;
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audio.src = url;
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await audio.play();
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console.log("playing audio from", url);
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}
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console.log('playing audio from', url);
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};
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const handlePause = () => {
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audio.pause();
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console.log("paused audio")
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}
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console.log('paused audio');
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};
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const handleZoomIn = () => {
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console.log("zoom in");
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console.log('zoom in');
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};
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const handleZoomOut = () => {
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console.log("zoom out");
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console.log('zoom out');
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};
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// render component:
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const wrapperProps = {width: "90%", height: "500px", position: "relative", margin: "0 auto"} as React.CSSProperties;
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const waveformCanvasProps = {width: "100%", position: "absolute", top: 0, left: 0, right: 0, bottom: 0, zIndex: 0} as React.CSSProperties;
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const hudCanvasProps = {width: "100%", position: "absolute", top: 0, left: 0, right: 0, bottom: 0, zIndex: 1} as React.CSSProperties;
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const clockTextAreaProps = {color: "#999", width: "400px"};
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const wrapperProps = {
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width: '90%',
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height: '500px',
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position: 'relative',
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margin: '0 auto',
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} as React.CSSProperties;
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const waveformCanvasProps = {
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width: '100%',
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position: 'absolute',
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top: 0,
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left: 0,
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right: 0,
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bottom: 0,
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zIndex: 0,
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} as React.CSSProperties;
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const hudCanvasProps = {
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width: '100%',
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position: 'absolute',
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top: 0,
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left: 0,
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right: 0,
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bottom: 0,
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zIndex: 1,
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} as React.CSSProperties;
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const clockTextAreaProps = { color: '#999', width: '400px' };
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return <>
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return (
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<>
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<h1>clipper</h1>
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<div style={wrapperProps}>
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<canvas ref={waveformCanvasRef} width={canvasLogicalWidth} height={canvasLogicalHeight} style={waveformCanvasProps}></canvas>
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<canvas ref={hudCanvasRef} width={canvasLogicalWidth} height={canvasLogicalHeight} onMouseMove={handleMouseMove} onMouseDown={handleMouseDown} onMouseUp={handleMouseUp} style={hudCanvasProps}></canvas>
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<canvas
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ref={waveformCanvasRef}
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width={canvasLogicalWidth}
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height={canvasLogicalHeight}
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style={waveformCanvasProps}
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></canvas>
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<canvas
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ref={hudCanvasRef}
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width={canvasLogicalWidth}
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height={canvasLogicalHeight}
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onMouseMove={handleMouseMove}
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onMouseDown={handleMouseDown}
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onMouseUp={handleMouseUp}
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style={hudCanvasProps}
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></canvas>
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</div>
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<button onClick={handlePlay}>Play</button>
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<button onClick={handlePause}>Pause</button>
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<button onClick={handleZoomOut}>-</button>
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<input type="readonly" style={clockTextAreaProps} />
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</>
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}
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);
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};
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