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simple_abr_manager_unit.js
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/
simple_abr_manager_unit.js
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/*! @license
* Shaka Player
* Copyright 2016 Google LLC
* SPDX-License-Identifier: Apache-2.0
*/
goog.require('shaka.abr.SimpleAbrManager');
goog.require('shaka.test.ManifestGenerator');
goog.require('shaka.test.Util');
goog.require('shaka.util.PlayerConfiguration');
describe('SimpleAbrManager', () => {
const sufficientBWMultiplier = 1.06;
const defaultBandwidthEstimate = 500e3; // 500kbps
const oldDateNow = Date.now;
/** @type {shaka.extern.AbrConfiguration} */
let config;
/** @type {!jasmine.Spy} */
let switchCallback;
/** @type {!shaka.abr.SimpleAbrManager} */
let abrManager;
/** @type {shaka.extern.Manifest} */
let manifest;
/** @type {!Array.<shaka.extern.Variant>} */
let variants;
beforeEach(() => {
Date.now = () => 0;
switchCallback = jasmine.createSpy('switchCallback');
// Keep unsorted.
manifest = shaka.test.ManifestGenerator.generate((manifest) => {
manifest.addVariant(100, (variant) => {
variant.bandwidth = 4e5; // 400 kbps
variant.addAudio(0);
variant.addVideo(1);
});
manifest.addVariant(101, (variant) => {
variant.bandwidth = 1e6; // 1000 kbps
variant.addAudio(2);
variant.addVideo(3);
});
manifest.addVariant(102, (variant) => {
variant.bandwidth = 5e5; // 500 kbps
variant.addAudio(4);
variant.addVideo(5);
});
manifest.addVariant(103, (variant) => {
variant.bandwidth = 2e6;
variant.addAudio(6);
variant.addVideo(7);
});
manifest.addVariant(104, (variant) => {
variant.bandwidth = 2e6; // Identical on purpose.
variant.addAudio(8);
variant.addVideo(9);
});
manifest.addVariant(105, (variant) => {
variant.bandwidth = 6e5;
variant.addAudio(10);
variant.addVideo(11);
});
manifest.addTextStream(20);
manifest.addTextStream(21);
});
config = shaka.util.PlayerConfiguration.createDefault().abr;
config.defaultBandwidthEstimate = defaultBandwidthEstimate;
config.useNetworkInformation = false;
variants = manifest.variants;
abrManager = new shaka.abr.SimpleAbrManager();
abrManager.init(shaka.test.Util.spyFunc(switchCallback));
abrManager.configure(config);
abrManager.setVariants(variants);
});
afterEach(() => {
abrManager.stop();
Date.now = oldDateNow;
});
it('can choose audio and video Streams right away', () => {
const chosen = abrManager.chooseVariant();
expect(chosen).not.toBe(null);
});
it('uses custom default estimate', () => {
config.defaultBandwidthEstimate = 3e6;
abrManager.configure(config);
const chosen = abrManager.chooseVariant();
expect(chosen.id).toBe(103);
});
it('can handle empty variants', () => {
abrManager.setVariants([]);
const chosen = abrManager.chooseVariant();
expect(chosen).toBe(null);
});
it('can choose from audio only variants', () => {
manifest = shaka.test.ManifestGenerator.generate((manifest) => {
manifest.addVariant(0, (variant) => {
variant.bandwidth = 4e5;
variant.addAudio(0);
});
manifest.addVariant(1, (variant) => {
variant.bandwidth = 1e6;
variant.addAudio(2);
});
});
abrManager.setVariants(manifest.variants);
const chosen = abrManager.chooseVariant();
expect(chosen).not.toBe(null);
expect(chosen.audio).not.toBe(null);
expect(chosen.video).toBe(null);
});
it('can choose from video only variants', () => {
manifest = shaka.test.ManifestGenerator.generate((manifest) => {
manifest.addVariant(0, (variant) => {
variant.bandwidth = 4e5;
variant.addVideo(0);
});
manifest.addVariant(1, (variant) => {
variant.bandwidth = 1e6;
variant.addVideo(2);
});
});
abrManager.setVariants(manifest.variants);
const chosen = abrManager.chooseVariant();
expect(chosen).not.toBe(null);
expect(chosen.audio).toBe(null);
expect(chosen.video).not.toBe(null);
});
for (const bandwidth of [5e5, 6e5]) {
// Simulate some segments being downloaded just above the desired
// bandwidth.
const bytesPerSecond = sufficientBWMultiplier * bandwidth / 8.0;
const bandwidthKbps = bandwidth / 1000.0;
const description = 'picks correct Variant at ' + bandwidthKbps + ' kbps';
it(description, () => {
abrManager.setVariants(variants);
abrManager.chooseVariant();
abrManager.segmentDownloaded(1000, bytesPerSecond);
abrManager.segmentDownloaded(1000, bytesPerSecond);
abrManager.enable();
// Make another call to segmentDownloaded() so switchCallback() is
// called.
abrManager.segmentDownloaded(1000, bytesPerSecond);
// Expect variants 2 to be chosen for bandwidth = 5e5
// and variant 5 - for bandwidth = 6e5
const expectedVariant = (bandwidth == 6e5) ? variants[5] : variants[2];
expect(switchCallback).toHaveBeenCalledWith(expectedVariant);
});
}
it('can handle 0 duration segments', () => {
// Makes sure bandwidth estimate doesn't get set to NaN
// when a 0 duration segment is encountered.
// https://github.com/google/shaka-player/issues/582
const bandwidth = 5e5;
const bytesPerSecond = sufficientBWMultiplier * bandwidth / 8.0;
abrManager.setVariants(variants);
abrManager.chooseVariant();
// 0 duration segment shouldn't cause us to get stuck on the lowest variant
abrManager.segmentDownloaded(0, bytesPerSecond);
abrManager.segmentDownloaded(1000, bytesPerSecond);
abrManager.enable();
abrManager.segmentDownloaded(1000, bytesPerSecond);
expect(abrManager.getBandwidthEstimate()).toBeTruthy();
});
it('picks lowest variant when there is insufficient bandwidth', () => {
const bandwidth = 2e6;
abrManager.setVariants(variants);
abrManager.chooseVariant();
// Simulate some segments being downloaded just above the desired
// bandwidth.
const bytesPerSecond = sufficientBWMultiplier * bandwidth / 8.0;
abrManager.segmentDownloaded(1000, bytesPerSecond);
abrManager.segmentDownloaded(1000, bytesPerSecond);
abrManager.enable();
// Make another call to segmentDownloaded() so switchCallback() is
// called.
abrManager.segmentDownloaded(1000, bytesPerSecond);
// Expect variants 4 to be chosen
const expectedVariant = variants[3];
expect(switchCallback).toHaveBeenCalledWith(expectedVariant);
});
it('does not call switchCallback() if not enabled', () => {
const bandwidth = 5e5;
const bytesPerSecond = sufficientBWMultiplier * bandwidth / 8.0;
abrManager.setVariants(variants);
abrManager.chooseVariant();
// Don't enable AbrManager.
abrManager.segmentDownloaded(1000, bytesPerSecond);
abrManager.segmentDownloaded(1000, bytesPerSecond);
abrManager.segmentDownloaded(1000, bytesPerSecond);
expect(switchCallback).not.toHaveBeenCalled();
});
it('does not call switchCallback() in switch interval', () => {
let bandwidth = 5e5;
let bytesPerSecond = sufficientBWMultiplier * bandwidth / 8.0;
abrManager.setVariants(variants);
abrManager.chooseVariant();
abrManager.segmentDownloaded(1000, bytesPerSecond);
abrManager.segmentDownloaded(1000, bytesPerSecond);
abrManager.enable();
abrManager.segmentDownloaded(1000, bytesPerSecond);
expect(switchCallback).toHaveBeenCalled();
switchCallback.calls.reset();
// Simulate drop in bandwidth.
bandwidth = 2e6;
bytesPerSecond = sufficientBWMultiplier * bandwidth / 8.0;
abrManager.segmentDownloaded(1000, bytesPerSecond);
abrManager.segmentDownloaded(1000, bytesPerSecond);
abrManager.segmentDownloaded(1000, bytesPerSecond);
abrManager.segmentDownloaded(1000, bytesPerSecond);
abrManager.segmentDownloaded(1000, bytesPerSecond);
abrManager.segmentDownloaded(1000, bytesPerSecond);
abrManager.segmentDownloaded(1000, bytesPerSecond);
// Stay inside switch interval.
Date.now = () => (config.switchInterval - 2) * 1e3;
abrManager.segmentDownloaded(1000, bytesPerSecond);
expect(switchCallback).not.toHaveBeenCalled();
// Move outside switch interval.
Date.now = () => (config.switchInterval + 2) * 1e3;
abrManager.segmentDownloaded(1000, bytesPerSecond);
expect(switchCallback).toHaveBeenCalled();
});
it('does not clear the buffer on upgrade', () => {
// Simulate some segments being downloaded at a high rate, to trigger an
// upgrade.
const bandwidth = 5e5;
const bytesPerSecond = sufficientBWMultiplier * bandwidth / 8.0;
abrManager.setVariants(variants);
abrManager.chooseVariant();
abrManager.segmentDownloaded(1000, bytesPerSecond);
abrManager.segmentDownloaded(1000, bytesPerSecond);
abrManager.enable();
// Make another call to segmentDownloaded(). switchCallback() will be
// called to upgrade.
abrManager.segmentDownloaded(1000, bytesPerSecond);
// The second parameter is missing to indicate that the buffer should not be
// cleared.
expect(switchCallback).toHaveBeenCalledWith(jasmine.any(Object));
});
it('does not clear the buffer on downgrade', () => {
// Simulate some segments being downloaded at a low rate, to trigger a
// downgrade.
const bandwidth = 5e5;
const bytesPerSecond = sufficientBWMultiplier * bandwidth / 8.0;
// Set the default high so that the initial choice will be high-quality.
config.defaultBandwidthEstimate = 4e6;
abrManager.configure(config);
abrManager.setVariants(variants);
abrManager.chooseVariant();
abrManager.segmentDownloaded(1000, bytesPerSecond);
abrManager.segmentDownloaded(1000, bytesPerSecond);
abrManager.enable();
// Make another call to segmentDownloaded(). switchCallback() will be
// called to downgrade.
abrManager.segmentDownloaded(1000, bytesPerSecond);
// The second parameter is missing to indicate that the buffer should not be
// cleared.
expect(switchCallback).toHaveBeenCalledWith(jasmine.any(Object));
});
it('will respect restrictions', () => {
manifest = shaka.test.ManifestGenerator.generate((manifest) => {
manifest.addVariant(10, (variant) => {
variant.bandwidth = 1e5;
variant.addVideo(0, (stream) => {
stream.size(50, 50);
});
});
manifest.addVariant(11, (variant) => {
variant.bandwidth = 2e5;
variant.addVideo(1, (stream) => {
stream.size(200, 200);
});
});
});
abrManager.setVariants(manifest.variants);
let chosen = abrManager.chooseVariant();
expect(chosen.id).toBe(11);
config.restrictions.maxWidth = 100;
abrManager.configure(config);
chosen = abrManager.chooseVariant();
expect(chosen.id).toBe(10);
});
it('uses lowest-bandwidth variant when restrictions cannot be met', () => {
manifest = shaka.test.ManifestGenerator.generate((manifest) => {
manifest.addVariant(10, (variant) => {
variant.bandwidth = 1e5;
variant.addVideo(0, (stream) => {
stream.size(50, 50);
});
});
manifest.addVariant(11, (variant) => {
variant.bandwidth = 2e5;
variant.addVideo(1, (stream) => {
stream.size(200, 200);
});
});
});
abrManager.setVariants(manifest.variants);
let chosen = abrManager.chooseVariant();
expect(chosen.id).toBe(11);
// This restriction cannot be met, but we shouldn't fail.
config.restrictions.maxWidth = 1;
abrManager.configure(config);
chosen = abrManager.chooseVariant();
expect(chosen.id).toBe(10);
});
});