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import React = require("react");
import axios from "axios";
import { action, computed, reaction, IReactionDisposer } from "mobx";
import { observer } from "mobx-react";
import Waveform from "react-audio-waveform";
import { Doc } from "../../fields/Doc";
import { List } from "../../fields/List";
import { listSpec } from "../../fields/Schema";
import { Cast, NumCast } from "../../fields/Types";
import { numberRange } from "../../Utils";
import "./AudioWaveform.scss";
import { Colors } from "./global/globalEnums";
import Color = require("color");
export interface AudioWaveformProps {
duration: number; // length of media clip
rawDuration: number; // length of underlying media data
mediaPath: string;
layoutDoc: Doc;
clipStart: number;
clipEnd: number;
zoomFactor: number;
PanelHeight: number;
PanelWidth: number;
}
@observer
export class AudioWaveform extends React.Component<AudioWaveformProps> {
public static NUMBER_OF_BUCKETS = 100;
_disposer: IReactionDisposer | undefined;
@computed get waveHeight() { return Math.max(50, this.props.PanelHeight); }
@computed get clipStart() { return this.props.clipStart; }
@computed get clipEnd() { return this.props.clipEnd; }
@computed get zoomFactor() { return this.props.zoomFactor; }
@computed get audioBuckets() { return Cast(this.props.layoutDoc[this.audioBucketField(this.clipStart, this.clipEnd, this.zoomFactor)], listSpec("number"), []); }
audioBucketField = (start: number, end: number, zoomFactor: number) => "audioBuckets/" + "/" + start.toFixed(2).replace(".", "_") + "/" + end.toFixed(2).replace(".", "_") + "/" + (zoomFactor * 10);
componentWillUnmount() {
this._disposer?.();
}
componentDidMount() {
this._disposer = reaction(() => ({ clipStart: this.clipStart, clipEnd: this.clipEnd, fieldKey: this.audioBucketField(this.clipStart, this.clipEnd, this.zoomFactor), zoomFactor: this.props.zoomFactor }),
({ clipStart, clipEnd, fieldKey, zoomFactor }) => {
if (!this.props.layoutDoc[fieldKey]) {
// setting these values here serves as a "lock" to prevent multiple attempts to create the waveform at nerly the same time.
const waveform = Cast(this.props.layoutDoc[this.audioBucketField(0, this.props.rawDuration, 1)], listSpec("number"));
this.props.layoutDoc[fieldKey] = waveform && new List<number>(waveform.slice(clipStart / this.props.rawDuration * waveform.length, clipEnd / this.props.rawDuration * waveform.length));
setTimeout(() => this.createWaveformBuckets(fieldKey, clipStart, clipEnd, zoomFactor));
}
}, { fireImmediately: true });
}
// decodes the audio file into peaks for generating the waveform
createWaveformBuckets = async (fieldKey: string, clipStart: number, clipEnd: number, zoomFactor: number) => {
axios({ url: this.props.mediaPath, responseType: "arraybuffer" }).then(
(response) => {
const context = new window.AudioContext();
context.decodeAudioData(
response.data,
action((buffer) => {
const rawDecodedAudioData = buffer.getChannelData(0);
const startInd = clipStart / this.props.rawDuration;
const endInd = clipEnd / this.props.rawDuration;
const decodedAudioData = rawDecodedAudioData.slice(Math.floor(startInd * rawDecodedAudioData.length), Math.floor(endInd * rawDecodedAudioData.length));
const numBuckets = Math.floor(AudioWaveform.NUMBER_OF_BUCKETS * zoomFactor);
const bucketDataSize = Math.floor(
decodedAudioData.length / numBuckets
);
const brange = Array.from(Array(bucketDataSize));
const bucketList = numberRange(numBuckets).map(
(i: number) =>
brange.reduce(
(p, x, j) =>
Math.abs(
Math.max(p, decodedAudioData[i * bucketDataSize + j])
),
0
) / 2
);
this.props.layoutDoc[fieldKey] = new List<number>(bucketList);
})
);
}
);
}
render() {
return (
<div className="audioWaveform">
{/* <Waveform
barWidth={2}
width={() => this.props.PanelWidth}
height={this.props.PanelHeight}
peaks={this.audioBuckets}
color={Colors.MEDIUM_BLUE}
/> */}
<Waveform
color={Colors.MEDIUM_BLUE_ALT}
height={this.waveHeight}
barWidth={200 / this.audioBuckets.length}
pos={this.props.duration}
duration={this.props.duration}
peaks={this.audioBuckets}
progressColor={Colors.MEDIUM_BLUE_ALT}
/>
</div>
);
}
}
export interface WaveformProps {
barWidth: number;
width: () => number;
height: () => number;
peaks: number[];
color: string;
}
// @observer
// export class Waveform extends React.Component<WaveformProps> {
// private _canvas: HTMLCanvasElement | null = null;
// get width() { return this.props.width(); }
// get height() { return this.props.height(); }
// get peaks() { return this.props.peaks; }
// componentDidMount() {
// this.drawBars();
// }
// drawBars() {
// const waveCanvasCtx = this._canvas?.getContext("2d");
// if (waveCanvasCtx) {
// const pixelRatio = window.devicePixelRatio;
// console.log(pixelRatio);
// const displayWidth = Math.round(this.width);
// const displayHeight = Math.round(this.height);
// waveCanvasCtx.canvas.width = this.width;
// waveCanvasCtx.canvas.height = this.height;
// waveCanvasCtx.canvas.style.width = `${displayWidth}px`;
// waveCanvasCtx.canvas.style.height = `${displayHeight}px`;
// waveCanvasCtx.clearRect(0, 0, this.width, this.height);
// const hasMinVals = [].some.call(this.peaks, (val) => val < 0);
// let filteredPeaks = this.peaks;
// if (hasMinVals) {
// // If the first value is negative, add 1 to the filtered indices
// let indexOffset = 0;
// if (this.peaks[0] < 0) {
// indexOffset = 1;
// }
// filteredPeaks = [].filter.call(
// this.peaks,
// (_, index) => (index + indexOffset) % 2 == 0
// );
// }
// const $ = 0.5;
// const height = this.height;
// const offsetY = 0;
// const halfH = this.height / 2;
// const length = filteredPeaks.length;
// const bar = this.props.barWidth;
// const gap = 2;
// const step = bar + gap;
// let absmax = 1;
// absmax = this.absMax(filteredPeaks);
// const scale = length / this.width;
// waveCanvasCtx.fillStyle = this.props.color;
// for (let i = 0; i < this.width; i += step) {
// let h = Math.round(filteredPeaks[Math.floor(i * scale)] / absmax * halfH)
// if (h === 0) {
// h = 1
// }
// waveCanvasCtx.fillRect(i + $, halfH - h + offsetY, bar + $, h * 2)
// }
// }
// }
// absMax = (values: number[]) => {
// let max = -Infinity;
// for (const i in values) {
// const num = Math.abs(values[i]);
// if (num > max) {
// max = num;
// }
// }
// return max;
// }
// render() {
// return this.props.peaks ? (
// <canvas
// ref={(instance) => {
// this._canvas = instance;
// }}
// />
// ) : null
// }
// }
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