61 lines
1.6 KiB
TypeScript
61 lines
1.6 KiB
TypeScript
// Copyright 2021 Signal Messenger, LLC
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// SPDX-License-Identifier: AGPL-3.0-only
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import type { VideoFrameSource } from 'ringrtc';
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const COLORS: Array<[number, number, number]> = [
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[0xff, 0x00, 0x00],
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[0xff, 0x99, 0x00],
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[0xff, 0xff, 0x00],
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[0x00, 0xff, 0x00],
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[0x00, 0x99, 0xff],
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[0xff, 0x00, 0xff],
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[0x99, 0x33, 0xff],
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];
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class FakeGroupCallVideoFrameSource implements VideoFrameSource {
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private readonly sourceArray: Uint8Array;
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private readonly dimensions: [number, number];
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constructor(width: number, height: number, r: number, g: number, b: number) {
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const length = width * height * 4;
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this.sourceArray = new Uint8Array(length);
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for (let i = 0; i < length; i += 4) {
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this.sourceArray[i] = r;
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this.sourceArray[i + 1] = g;
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this.sourceArray[i + 2] = b;
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this.sourceArray[i + 3] = 255;
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}
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this.dimensions = [width, height];
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}
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receiveVideoFrame(destinationBuffer: Buffer): [number, number] | undefined {
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// Simulate network jitter. Also improves performance when testing.
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if (Math.random() < 0.5) {
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return undefined;
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}
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destinationBuffer.set(this.sourceArray);
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return this.dimensions;
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}
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}
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/**
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* This produces a fake video frame source that is a single color.
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*
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* The aspect ratio is fixed at 1.3 because that matches many of our stories.
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*/
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export function fakeGetGroupCallVideoFrameSource(
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demuxId: number
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): VideoFrameSource {
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const color = COLORS[demuxId % COLORS.length];
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if (!color) {
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throw new Error('Expected a color, but it was not found');
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}
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const [r, g, b] = color;
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return new FakeGroupCallVideoFrameSource(13, 10, r, g, b);
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}
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