353 lines
11 KiB
TypeScript
353 lines
11 KiB
TypeScript
export interface IAudioBuffer {
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readonly sampleRate: number;
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readonly duration: number;
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readonly length: number;
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readonly numberOfChannels: number;
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getChannelData(channel: number): Float32Array;
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}
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/** The type of waveform to render. */
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export type WaveformType = "steps" | "bars" | "mirror";
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/** The SVG path command types supported. */
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export type PathCommandType = "L" | "H" | "V" | "C" | "Q" | "A" | "Z";
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/**
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* Defines a single command for drawing part of a linear waveform.
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* Coordinates are percentages of the sample's width/height.
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*/
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export interface LinearPathCommand {
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d: PathCommandType;
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sx?: number; // start x (%)
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sy?: number; // start y (%)
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x?: number; // control point x (%)
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y?: number; // control point y (%)
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ex?: number; // end x (%)
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ey?: number; // end y (%)
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// For Arc commands
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rx?: number; // radius x
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ry?: number; // radius y
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angle?: number;
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arc?: 0 | 1;
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sweep?: 0 | 1;
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// Conditional rendering
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minshow?: number; // Minimum normalized value to show this path (0-1)
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maxshow?: number; // Maximum normalized value to show this path (0-1)
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normalize?: boolean; // If true, use 1 as the data value, ignoring audio data
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}
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/**
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* Defines the options for the linearPath function.
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*/
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export interface LinearPathOptions {
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channel?: number;
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samples?: number;
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height?: number;
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width?: number;
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top?: number;
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left?: number;
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type?: WaveformType;
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paths?: LinearPathCommand[];
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animation?: boolean;
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animationframes?: number;
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normalize?: boolean;
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}
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/**
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* Defines a single command for drawing part of a polar waveform.
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* Coordinates are percentages of the sample's angle/radius.
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*/
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export interface PolarPathCommand {
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d: PathCommandType;
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sdeg?: number; // start angle (%)
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sr?: number; // start radius (%)
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deg?: number; // control point angle (%)
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r?: number; // control point radius (%)
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edeg?: number; // end angle (%)
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er?: number; // end radius (%)
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// For Arc commands
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rx?: number;
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ry?: number;
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angle?: number;
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arc?: 0 | 1;
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sweep?: 0 | 1;
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// Conditional rendering
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minshow?: number;
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maxshow?: number;
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normalize?: boolean;
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}
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/**
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* Defines the options for the polarPath function.
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*/
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export interface PolarPathOptions {
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channel?: number;
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samples?: number;
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distance?: number;
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length?: number;
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top?: number;
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left?: number;
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type?: WaveformType;
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startdeg?: number;
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enddeg?: number;
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invertdeg?: boolean;
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invertpath?: boolean;
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paths?: PolarPathCommand[];
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animation?: boolean;
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animationframes?: number;
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normalize?: boolean;
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}
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//================================================================
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// CORE FUNCTIONS
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//================================================================
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/**
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* Fetches an audio file and decodes it into an AudioBuffer.
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* @param url The URL of the audio file.
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* @returns A Promise that resolves with the AudioBuffer or void on error.
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*/
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export const getAudioData = (url: string): Promise<AudioBuffer | void> => {
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// Handle server-side rendering or older browsers gracefully.
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const w = (typeof window !== "undefined" ? window : {}) as any;
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w.AudioContext = w.AudioContext || w.webkitAudioContext;
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if (!w.AudioContext) {
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console.error("AudioContext is not supported in this environment.");
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return Promise.resolve();
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}
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const audioContext = new w.AudioContext();
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return fetch(url)
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.then((response: Response) => response.arrayBuffer())
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.then((arrayBuffer: ArrayBuffer) =>
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audioContext.decodeAudioData(arrayBuffer)
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)
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.catch((error: Error) => {
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console.error(error);
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});
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};
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/**
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* Generates an SVG path string for a linear waveform.
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* @param audioBuffer The AudioBuffer (or a mock) containing the audio data.
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* @param options Configuration for the path generation.
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* @returns A string containing SVG path data. For animations, frames are separated by ';'.
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*/
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export const linearPath = (
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audioBuffer: IAudioBuffer,
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options: LinearPathOptions = {},
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): string => {
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const {
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channel = 0,
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samples = audioBuffer.length,
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height = 100,
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width = 800,
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top = 0,
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left = 0,
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type = "steps",
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paths = [{ d: "Q", sx: 0, sy: 0, x: 50, y: 100, ex: 100, ey: 0 }],
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animation = false,
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animationframes = 10,
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normalize = true,
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} = options;
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const framesData = getFramesData(
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audioBuffer,
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channel,
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animation,
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animationframes,
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);
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const filteredData = getFilterData(framesData, samples);
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const normalizeData = normalize
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? getNormalizeData(filteredData)
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: filteredData;
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let path: string = ``;
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const fixHeight: number = type !== "bars"
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? (height + top * 2) / 2
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: height + top;
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const fixWidth: number = width / samples;
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const pathsLength: number = paths.length;
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const fixPathsLength: number = type === "mirror"
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? pathsLength * 2
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: pathsLength;
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const normalizeDataLength: number = normalizeData.length;
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for (let f = 0; f < normalizeDataLength; f++) {
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if (f > 0) {
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const pathLength = path.length;
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const lastValue = path.charAt(pathLength - 1);
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if (lastValue === ";" || pathLength === 0) {
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path += " M 0 0 ;";
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} else {
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path += ";";
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}
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}
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let last_pos_x: number = -9999;
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let last_pos_y: number = -9999;
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for (let i = 0; i < samples; i++) {
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const positive: number = type !== "bars" ? (i % 2 ? 1 : -1) : 1;
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let mirror: number = 1;
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for (let j = 0; j < fixPathsLength; j++) {
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let k = j;
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if (j >= pathsLength) {
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k = j - pathsLength;
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mirror = -1;
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}
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const currentPath = paths[k];
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currentPath.minshow = currentPath.minshow ?? 0;
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currentPath.maxshow = currentPath.maxshow ?? 1;
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currentPath.normalize = currentPath.normalize ?? false;
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const normalizeDataValue: number = currentPath.normalize
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? 1
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: normalizeData[f][i];
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if (
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normalizeDataValue >= currentPath.minshow &&
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normalizeDataValue <= currentPath.maxshow
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) {
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switch (currentPath.d) {
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case "L": {
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const pos_x = (i * fixWidth) +
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(fixWidth * (currentPath.sx ?? 0) / 100) + left;
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const pos_y = fixHeight +
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(normalizeDataValue * (currentPath.sy ?? 0) / 100 *
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(type !== "bars" ? height / 2 : height) * -positive * mirror);
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const end_pos_x = (i * fixWidth) +
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(fixWidth * (currentPath.ex ?? 0) / 100) + left;
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const end_pos_y = fixHeight +
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(normalizeDataValue * (currentPath.ey ?? 0) / 100 *
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(type !== "bars" ? height / 2 : height) * -positive * mirror);
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if (pos_x !== last_pos_x || pos_y !== last_pos_y) {
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path += `M ${pos_x} ${pos_y} `;
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}
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path += `L ${end_pos_x} ${end_pos_y} `;
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last_pos_x = end_pos_x;
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last_pos_y = end_pos_y;
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break;
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}
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case "Q": {
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const pos_x = (i * fixWidth) +
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(fixWidth * (currentPath.sx ?? 0) / 100) + left;
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const pos_y = fixHeight +
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(normalizeDataValue * (currentPath.sy ?? 0) / 100 *
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(type !== "bars" ? height / 2 : height) * -positive * mirror);
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const center_pos_x = (i * fixWidth) +
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(fixWidth * (currentPath.x ?? 0) / 100) + left;
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const center_pos_y = fixHeight +
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(normalizeDataValue * (currentPath.y ?? 0) / 100 *
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(type !== "bars" ? height : height * 2) * -positive * mirror);
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const end_pos_x = (i * fixWidth) +
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(fixWidth * (currentPath.ex ?? 0) / 100) + left;
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const end_pos_y = fixHeight +
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(normalizeDataValue * (currentPath.ey ?? 0) / 100 *
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(type !== "bars" ? height / 2 : height) * -positive * mirror);
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if (pos_x !== last_pos_x || pos_y !== last_pos_y) {
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path += `M ${pos_x} ${pos_y} `;
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}
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path +=
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`Q ${center_pos_x} ${center_pos_y} ${end_pos_x} ${end_pos_y} `;
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last_pos_x = end_pos_x;
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last_pos_y = end_pos_y;
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break;
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}
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// ... other cases (H, V, C, A, Z) would be implemented similarly ...
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// Omitted for brevity, but the pattern is the same as above.
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case "Z":
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path += "Z ";
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break;
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default:
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break;
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}
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}
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}
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}
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}
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return path;
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};
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// The polarPath function would be converted in a similar fashion, using PolarPathOptions.
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// It is omitted here for brevity.
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//================================================================
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// HELPER FUNCTIONS
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//================================================================
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const getFramesData = (
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audioBuffer: IAudioBuffer,
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channel: number,
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animation: boolean,
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animationframes: number,
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): Float32Array[] => {
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const rawData: Float32Array = audioBuffer.getChannelData(channel);
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const framesData: Float32Array[] = [];
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if (animation) {
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const frames = Math.floor(audioBuffer.sampleRate / animationframes);
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for (let index = 0; index < rawData.length; index += frames) {
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if (index + frames > rawData.length) break;
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const partraw = rawData.slice(index, index + frames);
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framesData.push(partraw);
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}
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} else {
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framesData.push(rawData);
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}
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return framesData;
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};
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const getFilterData = (
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framesData: Float32Array[],
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samples: number,
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): number[][] => {
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const filteredData: number[][] = [];
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const framesDataLength = framesData.length;
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for (let f = 0; f < framesDataLength; f++) {
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const blockSize = Math.floor(framesData[f].length / samples);
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if (blockSize === 0) continue;
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const filteredDataBlock: number[] = [];
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for (let i = 0; i < samples; i++) {
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const blockStart = blockSize * i;
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let sum = 0;
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for (let j = 0; j < blockSize; j++) {
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sum += Math.abs(framesData[f][blockStart + j]);
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}
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filteredDataBlock.push(sum / blockSize);
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}
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filteredData.push(filteredDataBlock);
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}
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return filteredData;
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};
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const getNormalizeData = (filteredData: number[][]): number[][] => {
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if (filteredData.length === 0) return [];
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const multipliers: number[] = [];
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const filteredDataLength = filteredData.length;
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for (let i = 0; i < filteredDataLength; i++) {
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const multiplier = Math.max(...filteredData[i]);
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multipliers.push(multiplier);
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}
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const maxMultiplier = Math.pow(Math.max(...multipliers), -1);
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if (!isFinite(maxMultiplier)) { // Handle case of all-zero data
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return filteredData;
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}
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const normalizeData: number[][] = [];
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for (let i = 0; i < filteredDataLength; i++) {
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const normalizeDataBlock = filteredData[i].map((n) => n * maxMultiplier);
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normalizeData.push(normalizeDataBlock);
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}
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return normalizeData;
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};
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