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fix: Select first of identical audio streams #3869

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merged 2 commits into from Feb 17, 2022
Merged

fix: Select first of identical audio streams #3869

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9ef83ba
Select first audio stream based on the order in the manifest.
wjywbs Jan 18, 2022
ad491f1
update tests
wjywbs Jan 18, 2022
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18 changes: 12 additions & 6 deletions lib/abr/simple_abr_manager.js
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Expand Up @@ -9,7 +9,6 @@ goog.provide('shaka.abr.SimpleAbrManager');
goog.require('goog.asserts');
goog.require('shaka.abr.EwmaBandwidthEstimator');
goog.require('shaka.log');
goog.require('shaka.util.Iterables');
goog.require('shaka.util.StreamUtils');


Expand Down Expand Up @@ -145,23 +144,30 @@ shaka.abr.SimpleAbrManager = class {
// Start by assuming that we will use the first Stream.
let chosen = sortedVariants[0] || null;

const enumerate = (it) => shaka.util.Iterables.enumerate(it);
for (const {item, next} of enumerate(sortedVariants)) {
for (let i = 0; i < sortedVariants.length; i++) {
const item = sortedVariants[i];
const playbackRate =
!isNaN(this.playbackRate_) ? Math.abs(this.playbackRate_) : 1;
const itemBandwidth = playbackRate * item.bandwidth;
const minBandwidth =
itemBandwidth / this.config_.bandwidthDowngradeTarget;
const nextBandwidth =
playbackRate * (next || {bandwidth: Infinity}).bandwidth;
let next = {bandwidth: Infinity};
for (let j = i + 1; j < sortedVariants.length; j++) {
if (item.bandwidth != sortedVariants[j].bandwidth) {
next = sortedVariants[j];
break;
}
}
const nextBandwidth = playbackRate * next.bandwidth;
const maxBandwidth = nextBandwidth / this.config_.bandwidthUpgradeTarget;
shaka.log.v2('Bandwidth ranges:',
(itemBandwidth / 1e6).toFixed(3),
(minBandwidth / 1e6).toFixed(3),
(maxBandwidth / 1e6).toFixed(3));

if (currentBandwidth >= minBandwidth &&
currentBandwidth <= maxBandwidth) {
currentBandwidth <= maxBandwidth &&
chosen.bandwidth != item.bandwidth) {
chosen = item;
}
}
Expand Down
4 changes: 2 additions & 2 deletions test/abr/simple_abr_manager_unit.js
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Expand Up @@ -91,7 +91,7 @@ describe('SimpleAbrManager', () => {
config.defaultBandwidthEstimate = 3e6;
abrManager.configure(config);
const chosen = abrManager.chooseVariant();
expect(chosen.id).toBe(104);
expect(chosen.id).toBe(103);
});

it('can handle empty variants', () => {
Expand Down Expand Up @@ -208,7 +208,7 @@ describe('SimpleAbrManager', () => {
abrManager.segmentDownloaded(1000, bytesPerSecond);

// Expect variants 4 to be chosen
const expectedVariant = variants[4];
const expectedVariant = variants[3];

expect(switchCallback).toHaveBeenCalledWith(expectedVariant);
});
Expand Down