mpegts-demuxer/lib/utils/__test__/index.test.js

Demuxes an MPEG Transport Stream into elementary packets.

"use strict";

var _ = require("..");

describe('decodeTs', () => {
  it('should decode timestamps that use multiple bytes', () => {
    const chunk = new Uint8Array([0b00000000, 0b00000100, 0b00010000, 0b00100000, 0b00001010]);
    const mem = new DataView(chunk.buffer);
    const decodedTimestamp = (0, _.decodeTs)(mem, 0);
    expect(decodedTimestamp).toBe(17043461); // 0b00000001000001000001000000000101
  });
  it('should decode small timestamps', () => {
    const chunk = new Uint8Array([0b00000000, 0b00000000, 0b00000000, 0b00000000, 0b00001010]);
    const mem = new DataView(chunk.buffer);
    const decodedTimestamp = (0, _.decodeTs)(mem, 0);
    expect(decodedTimestamp).toBe(5); // 0b101
  });
  it('should timestamps larger than 32 bit integers', () => {
    const chunk = new Uint8Array([0b11111111, 0b11111111, 0b11111111, 0b11111111, 0b11111111]);
    const mem = new DataView(chunk.buffer);
    const decodedTimestamp = (0, _.decodeTs)(mem, 0);
    expect(decodedTimestamp).toBe(8589934591);
  });
});