114 lines
4.4 KiB
JavaScript
114 lines
4.4 KiB
JavaScript
import assert from 'node:assert/strict';
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import fs from 'node:fs';
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import vm from 'node:vm';
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const viewSource = fs.readFileSync(new URL('../www/views/spectrogram.js', import.meta.url), 'utf8');
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const timingSource = viewSource.match(/export function stepScrollAccumulator[\s\S]*?\n\}/)?.[0];
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assert.ok(timingSource, 'stepScrollAccumulator must remain testable');
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const timingContext = vm.createContext({ Number, Math });
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vm.runInContext(timingSource.replace('export function', 'function'), timingContext);
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const { stepScrollAccumulator } = timingContext;
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const pixelsSource = viewSource.match(/export function spectrogramPixelsPerSourceFrame[\s\S]*?\n\}/)?.[0];
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assert.ok(pixelsSource, 'spectrogramPixelsPerSourceFrame must remain testable');
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timingContext.BASE_SCROLL_CSS_PX_PER_SECOND = 60;
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vm.runInContext(pixelsSource.replace('export function', 'function'), timingContext);
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const { spectrogramPixelsPerSourceFrame } = timingContext;
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function emittedColumns(rate, frames, pixelScale = 1) {
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let accumulator = 0;
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let columns = 0;
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for (let frame = 0; frame < frames; frame++) {
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const step = stepScrollAccumulator(accumulator, rate * pixelScale, 1);
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accumulator = step.accumulator;
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columns += step.columns;
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}
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return columns;
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}
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assert.equal(emittedColumns(0.5, 20), 10, '0.5x must emit every second source frame');
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assert.equal(emittedColumns(1, 20), 20);
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assert.equal(emittedColumns(2, 20), 40);
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assert.equal(emittedColumns(4, 20), 80);
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assert.equal(emittedColumns(6, 20), 120);
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assert.equal(emittedColumns(1, 10, 1.7), 17, 'DPR scaling must preserve CSS scroll speed');
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function emittedInOneSecond(rate, fftSize) {
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const sampleRate = 48000;
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const hop = Math.max(128, Math.floor(fftSize / 8));
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const sourceFrames = sampleRate / hop;
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const pixelsPerFrame = spectrogramPixelsPerSourceFrame(rate, sampleRate, fftSize);
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return emittedColumns(pixelsPerFrame, sourceFrames);
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}
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assert.equal(emittedInOneSecond(0.5, 4096), 30);
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assert.equal(emittedInOneSecond(1, 4096), 60);
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assert.equal(emittedInOneSecond(1, 8192), 60, 'FFT size must not alter real-time scroll speed');
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assert.equal(emittedInOneSecond(2, 8192), 120);
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assert.equal(emittedInOneSecond(4, 8192), 240);
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assert.equal(emittedInOneSecond(6, 8192), 360);
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const messages = [];
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const calls = { drawImage: 0, putImageData: [] };
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const context2d = {
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imageSmoothingEnabled: true,
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globalCompositeOperation: 'source-over',
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fillStyle: '#000',
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save() {},
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restore() {},
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fillRect() {},
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drawImage() { calls.drawImage += 1; },
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createImageData(width, height) {
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return { width, height, data: new Uint8ClampedArray(width * height * 4) };
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},
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putImageData(image, x, y) { calls.putImageData.push({ image, x, y }); },
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};
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const canvas = {
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width: 0,
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height: 0,
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getContext() { return context2d; },
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};
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const workerContext = vm.createContext({
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self: {},
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postMessage(message) { messages.push(message); },
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performance: { now: (() => { let now = 0; return () => ++now; })() },
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Float32Array,
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Uint8ClampedArray,
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Number,
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Math,
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});
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const workerSource = fs.readFileSync(new URL('../www/workers/spectrogram.worker.js', import.meta.url), 'utf8');
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vm.runInContext(workerSource, workerContext, { filename: 'spectrogram.worker.js' });
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workerContext.self.onmessage({
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data: { type: 'init', canvas, width: 8, height: 4, topDb: 0, bottomDb: -80, gamma: 1 },
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});
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assert.equal(messages.at(-1)?.type, 'ready');
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workerContext.self.onmessage({
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data: { type: 'column', id: 7, repeat: 2, data: new Float32Array([-80, -40, -20, 0]) },
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});
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const ack = messages.at(-1);
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assert.equal(ack.type, 'drawn');
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assert.equal(ack.id, 7);
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assert.equal(ack.repeat, 2);
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assert.equal(calls.drawImage, 1, 'existing canvas should be shifted once');
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assert.equal(calls.putImageData.length, 1, 'only the new stripe should be uploaded');
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assert.equal(calls.putImageData[0].image.width, 2);
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assert.equal(calls.putImageData[0].x, 6);
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// Roughly ten minutes at 100 source columns/s. The worker has no history or
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// pending-message collection that can grow with runtime.
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messages.length = 0;
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context2d.putImageData = () => {};
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const longRunColumn = new Float32Array([-80, -40, -20, 0]);
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for (let index = 0; index < 60_000; index++) {
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workerContext.self.onmessage({
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data: { type: 'column', id: 100 + index, repeat: 1, data: longRunColumn },
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});
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}
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assert.equal(messages.length, 60_000);
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assert.equal(messages.at(-1)?.type, 'drawn');
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assert.equal(messages.at(-1)?.id, 60_099);
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console.log('spectrogram timing and worker tests passed');
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