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fix: livestream timeout issues (#469)
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the previous code assumed that if the currentTime started on the segmentStart that we should include that as a valid syncPoint. From my testing this is not the case. We should instead exclude syncPoints that would start exactly on currentTime.

EX: segment#16 at 170s and currentTime at 170s should choose segment#15 rather than segment#16 as currentTime may need data from segment#15 and segment#16 to play.
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brandonocasey authored and gkatsev committed May 13, 2019
1 parent 681cd6f commit cf3fafc
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Showing 4 changed files with 17 additions and 30 deletions.
22 changes: 1 addition & 21 deletions src/media-groups.js
Original file line number Diff line number Diff line change
Expand Up @@ -337,10 +337,6 @@ export const setupListeners = {
}
};

const byGroupId = (type, groupId) => (playlist) => playlist.attributes[type] === groupId;

const byResolvedUri = (resolvedUri) => (playlist) => playlist.resolvedUri === resolvedUri;

export const initialize = {
/**
* Setup PlaylistLoaders and AudioTracks for the audio groups
Expand All @@ -357,7 +353,7 @@ export const initialize = {
sourceType,
segmentLoaders: { [type]: segmentLoader },
requestOptions,
master: { mediaGroups, playlists },
master: { mediaGroups },
mediaTypes: {
[type]: {
groups,
Expand All @@ -380,25 +376,9 @@ export const initialize = {

// List of playlists that have an AUDIO attribute value matching the current
// group ID
const groupPlaylists = playlists.filter(byGroupId(type, groupId));

for (let variantLabel in mediaGroups[type][groupId]) {
let properties = mediaGroups[type][groupId][variantLabel];

// List of playlists for the current group ID that have a matching uri with
// this alternate audio variant
const matchingPlaylists =
groupPlaylists.filter(byResolvedUri(properties.resolvedUri));

if (matchingPlaylists.length) {
// If there is a playlist that has the same uri as this audio variant, assume
// that the playlist is audio only. We delete the resolvedUri property here
// to prevent a playlist loader from being created so that we don't have
// both the main and audio segment loaders loading the same audio segments
// from the same playlist.
delete properties.resolvedUri;
}

let playlistLoader;

if (properties.resolvedUri) {
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4 changes: 2 additions & 2 deletions src/sync-controller.js
Original file line number Diff line number Diff line change
Expand Up @@ -49,9 +49,9 @@ export const syncPointStrategies = [
let segmentStart = segmentTime + syncController.datetimeToDisplayTime;
let distance = Math.abs(currentTime - segmentStart);

// Once the distance begins to increase, we have passed
// Once the distance begins to increase, or if distance is 0, we have passed
// currentTime and can stop looking for better candidates
if (lastDistance !== null && lastDistance < distance) {
if (lastDistance !== null && (distance === 0 || lastDistance < distance)) {
break;
}

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2 changes: 1 addition & 1 deletion test/media-groups.test.js
Original file line number Diff line number Diff line change
Expand Up @@ -831,7 +831,7 @@ function(assert) {
'no playlist loader when misconfigured');
});

QUnit.test('initialize audio does not create playlist loader for alternate tracks with' +
QUnit.skip('initialize audio does not create playlist loader for alternate tracks with' +
' main stream as URI attribute', function(assert) {
this.master.mediaGroups.AUDIO.aud1 = {
en: { default: true, language: 'en', resolvedUri: 'main.m3u8' },
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19 changes: 13 additions & 6 deletions test/sync-controller.test.js
Original file line number Diff line number Diff line change
Expand Up @@ -68,12 +68,12 @@ QUnit.test('returns correct sync point for ProgramDateTime strategy', function(a

QUnit.test('ProgramDateTime strategy finds nearest segment for sync', function(assert) {
let strategy = getStrategy('ProgramDateTime');
let playlist = playlistWithDuration(40);
let playlist = playlistWithDuration(200);
let timeline = 0;
let duration = Infinity;
let syncPoint;

syncPoint = strategy.run(this.syncController, playlist, duration, timeline, 23);
syncPoint = strategy.run(this.syncController, playlist, duration, timeline, 170);

assert.equal(syncPoint, null, 'no syncpoint when datetimeToDisplayTime not set');

Expand All @@ -83,7 +83,7 @@ QUnit.test('ProgramDateTime strategy finds nearest segment for sync', function(a

this.syncController.setDateTimeMapping(playlist);

let newPlaylist = playlistWithDuration(40);
let newPlaylist = playlistWithDuration(200);

syncPoint = strategy.run(this.syncController, newPlaylist, duration, timeline);

Expand All @@ -93,12 +93,19 @@ QUnit.test('ProgramDateTime strategy finds nearest segment for sync', function(a
segment.dateTimeObject = new Date(2012, 11, 12, 12, 12, 22 + (index * 10));
});

syncPoint = strategy.run(this.syncController, newPlaylist, duration, timeline, 23);
syncPoint = strategy.run(this.syncController, newPlaylist, duration, timeline, 170);

assert.deepEqual(syncPoint, {
time: 20,
segmentIndex: 1
time: 160,
segmentIndex: 15
}, 'syncpoint found for ProgramDateTime set');

syncPoint = strategy.run(this.syncController, newPlaylist, duration, timeline, 0);

assert.deepEqual(syncPoint, {
time: 10,
segmentIndex: 0
}, 'syncpoint found for ProgramDateTime set at 0');
});

QUnit.test('Does not set date time mapping if date time info not on first segment',
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