sound-visualizer/lib/helpers/impure.js

## Description

"use strict";
var __defProp = Object.defineProperty;
var __defProps = Object.defineProperties;
var __getOwnPropDesc = Object.getOwnPropertyDescriptor;
var __getOwnPropDescs = Object.getOwnPropertyDescriptors;
var __getOwnPropNames = Object.getOwnPropertyNames;
var __getOwnPropSymbols = Object.getOwnPropertySymbols;
var __hasOwnProp = Object.prototype.hasOwnProperty;
var __propIsEnum = Object.prototype.propertyIsEnumerable;
var __defNormalProp = (obj, key, value) => key in obj ? __defProp(obj, key, { enumerable: true, configurable: true, writable: true, value }) : obj[key] = value;
var __spreadValues = (a, b) => {
  for (var prop in b || (b = {}))
    if (__hasOwnProp.call(b, prop))
      __defNormalProp(a, prop, b[prop]);
  if (__getOwnPropSymbols)
    for (var prop of __getOwnPropSymbols(b)) {
      if (__propIsEnum.call(b, prop))
        __defNormalProp(a, prop, b[prop]);
    }
  return a;
};
var __spreadProps = (a, b) => __defProps(a, __getOwnPropDescs(b));
var __export = (target, all) => {
  for (var name in all)
    __defProp(target, name, { get: all[name], enumerable: true });
};
var __copyProps = (to, from, except, desc) => {
  if (from && typeof from === "object" || typeof from === "function") {
    for (let key of __getOwnPropNames(from))
      if (!__hasOwnProp.call(to, key) && key !== except)
        __defProp(to, key, { get: () => from[key], enumerable: !(desc = __getOwnPropDesc(from, key)) || desc.enumerable });
  }
  return to;
};
var __toCommonJS = (mod) => __copyProps(__defProp({}, "__esModule", { value: true }), mod);

// src/helpers/impure.ts
var impure_exports = {};
__export(impure_exports, {
  clearCanvas: () => clearCanvas,
  drawContinuousWave: () => drawContinuousWave,
  drawCurrentWave: () => drawCurrentWave,
  startAnalysis: () => startAnalysis
});
module.exports = __toCommonJS(impure_exports);

// src/common/draw/impure.ts
function clearCanvas(canvas) {
  const context = canvas.getContext("2d");
  if (!context)
    return;
  const { width, height } = canvas;
  context.clearRect(0, 0, width, height);
}

// src/common/draw/options.ts
var defaultDrawOptions = {
  strokeColor: "#000",
  rectWidth: 2
};

// src/continuous/draw/options.ts
var defaultOptions = __spreadProps(__spreadValues({}, defaultDrawOptions), {
  slices: 100,
  barRadius: 0
});

// src/continuous/draw/pure.ts
function calculateLine(canvasHeight, value) {
  let fraction = value / 255;
  if (fraction < 0.05)
    fraction += 0.05;
  const start = canvasHeight / 2 * fraction;
  const end = canvasHeight - start;
  return { start, end };
}

// src/common/draw/pure.ts
var THICKNESS_MAP = {
  thin: 1,
  default: 2,
  thick: 2.75
};
function widthFromOption(lineWidth, canvasWidth) {
  if (typeof lineWidth === "number")
    return lineWidth;
  return THICKNESS_MAP[lineWidth] / 300 * canvasWidth;
}

// src/continuous/draw/impure.ts
function drawContinuousWave(canvas, audioHistory, options = defaultOptions) {
  const context = canvas.getContext("2d");
  if (!context)
    return;
  const { strokeColor = "#000000", rectWidth = "default", slices = 100, barRadius = 0 } = options;
  const { height, width } = canvas;
  const w = widthFromOption(rectWidth, width);
  context.fillStyle = strokeColor;
  context.clearRect(0, 0, width, height);
  context.beginPath();
  const sliceWidth = width / slices;
  const historyToCheck = audioHistory.slice(-slices);
  for (let i = 0; i < slices; i++) {
    if (i >= audioHistory.length)
      break;
    const value = historyToCheck[i];
    const { start, end } = calculateLine(height, value);
    const x = i * sliceWidth;
    if (barRadius <= 0) {
      context.rect(x, start, w, end - start);
    } else {
      context.roundRect(x, start, w, end - start, barRadius);
    }
  }
  context.fill();
}

// src/current/draw/options.ts
var defaultOptions2 = __spreadProps(__spreadValues({}, defaultDrawOptions), {
  heightNorm: 1
});

// src/current/draw/impure.ts
function drawCurrentWave(canvas, audioData, options = defaultOptions2) {
  const context = canvas.getContext("2d");
  if (!context)
    return;
  const { strokeColor = "#000", rectWidth = "default", heightNorm = 1 } = options;
  const { height, width } = canvas;
  const sliceWidth = width / audioData.length;
  context.lineWidth = widthFromOption(rectWidth, width);
  context.strokeStyle = strokeColor;
  context.clearRect(0, 0, width, height);
  context.beginPath();
  context.moveTo(0, height / 2);
  for (let i = 0; i < audioData.length; i++) {
    const x = i * sliceWidth;
    const fraction = audioData[i] / 255;
    const sectionSize = height * heightNorm;
    const y = fraction * sectionSize + (height - sectionSize) * 0.5;
    context.lineTo(x, y);
  }
  context.lineTo(sliceWidth * audioData.length, height / 2);
  context.stroke();
}

// src/helpers/impure.ts
var activeAnalysers = /* @__PURE__ */ new Map();
function startAnalysis(audio) {
  let activeAnalyser = activeAnalysers.get(audio.id);
  if (!activeAnalyser) {
    const audioContext2 = new window.AudioContext();
    activeAnalyser = {
      audioContext: audioContext2,
      analyser: audioContext2.createAnalyser()
    };
    activeAnalysers.set(audio.id, activeAnalyser);
  }
  const { audioContext, analyser } = activeAnalyser;
  const dataArray = new Uint8Array(analyser.frequencyBinCount);
  const source = audioContext.createMediaStreamSource(audio);
  source.connect(analyser);
  function analyse() {
    analyser.getByteTimeDomainData(dataArray);
    return dataArray;
  }
  function disconnect() {
    source.disconnect();
    analyser.disconnect();
    audioContext.close().then(() => {
      activeAnalysers.delete(audio.id);
    });
  }
  return { analyse, disconnect };
}
// Annotate the CommonJS export names for ESM import in node:
0 && (module.exports = {
  clearCanvas,
  drawContinuousWave,
  drawCurrentWave,
  startAnalysis
});