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fix: Add exclude reason and skip duplicate playlist-unchanged #1082

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merged 9 commits into from
Mar 5, 2021
Merged

fix: Add exclude reason and skip duplicate playlist-unchanged #1082

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3ae779f
fix: Add exclude reason and skip duplicate playlist-unchanged
brandonocasey Feb 24, 2021
fae6f77
better timers
brandonocasey Feb 24, 2021
c05a92b
"private" exclude reason
brandonocasey Feb 24, 2021
ed74bcb
better media update timeout again
brandonocasey Feb 24, 2021
cf6776d
better minimum update period timeout
brandonocasey Feb 25, 2021
b6cf366
faster mup updates
brandonocasey Feb 26, 2021
2a5929c
cr
brandonocasey Mar 3, 2021
4494e16
log warning on < 0 minimumUpdatePeriod
brandonocasey Mar 5, 2021
9a3acef
logger change
brandonocasey Mar 5, 2021
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95 changes: 68 additions & 27 deletions src/dash-playlist-loader.js
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Original file line number Diff line number Diff line change
Expand Up @@ -415,6 +415,14 @@ export default class DashPlaylistLoader extends EventTarget {
window.clearTimeout(this.minimumUpdatePeriodTimeout_);
window.clearTimeout(this.mediaRequest_);
window.clearTimeout(this.mediaUpdateTimeout);
this.mediaUpdateTimeout = null;
this.mediaRequest_ = null;
this.minimumUpdatePeriodTimeout_ = null;

if (this.masterPlaylistLoader_.createMupOnMedia_) {
this.off('loadedmetadata', this.masterPlaylistLoader_.createMupOnMedia_);
this.masterPlaylistLoader_.createMupOnMedia_ = null;
}

this.off();
}
Expand Down Expand Up @@ -505,9 +513,15 @@ export default class DashPlaylistLoader extends EventTarget {
}

pause() {
if (this.masterPlaylistLoader_.createMupOnMedia_) {
this.off('loadedmetadata', this.masterPlaylistLoader_.createMupOnMedia_);
this.masterPlaylistLoader_.createMupOnMedia_ = null;
}
this.stopRequest();
window.clearTimeout(this.mediaUpdateTimeout);
window.clearTimeout(this.minimumUpdatePeriodTimeout_);
window.clearTimeout(this.masterPlaylistLoader_.minimumUpdatePeriodTimeout_);
this.masterPlaylistLoader_.minimumUpdatePeriodTimeout_ = null;
this.mediaUpdateTimeout = null;
if (this.state === 'HAVE_NOTHING') {
// If we pause the loader before any data has been retrieved, its as if we never
// started, so reset to an unstarted state.
Expand All @@ -517,7 +531,7 @@ export default class DashPlaylistLoader extends EventTarget {

load(isFinalRendition) {
window.clearTimeout(this.mediaUpdateTimeout);
window.clearTimeout(this.minimumUpdatePeriodTimeout_);
this.mediaUpdateTimeout = null;

const media = this.media();

Expand Down Expand Up @@ -696,45 +710,63 @@ export default class DashPlaylistLoader extends EventTarget {
this.masterPlaylistLoader_.srcUrl = location;
}

// if the minimumUpdatePeriod was changed, update the minimumUpdatePeriodTimeout_
if (!oldMaster || (newMaster && oldMaster.minimumUpdatePeriod !== newMaster.minimumUpdatePeriod)) {
if (!oldMaster || (newMaster && newMaster.minimumUpdatePeriod !== oldMaster.minimumUpdatePeriod)) {
this.updateMinimumUpdatePeriodTimeout_();
}

return Boolean(newMaster);
}

updateMinimumUpdatePeriodTimeout_() {
// Clear existing timeout
window.clearTimeout(this.minimumUpdatePeriodTimeout_);
const mpl = this.masterPlaylistLoader_;

const createMUPTimeout = (mup) => {
this.minimumUpdatePeriodTimeout_ = window.setTimeout(() => {
this.trigger('minimumUpdatePeriod');
createMUPTimeout(mup);
}, mup);
};
// cancel any pending creation of mup on media
// a new one will be added if needed.
if (mpl.createMupOnMedia_) {
mpl.off('loadedmetadata', mpl.createMupOnMedia_);
mpl.createMupOnMedia_ = null;
}

const minimumUpdatePeriod = this.masterPlaylistLoader_.master && this.masterPlaylistLoader_.master.minimumUpdatePeriod;
// clear any pending timeouts, master was just updated
// so if minimumUpdatePeriodTimeout_ is still valid
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window.clearTimeout(mpl.minimumUpdatePeriodTimeout_);
mpl.minimumUpdatePeriodTimeout_ = null;
mpl.createMUPTimeout_();
}

if (minimumUpdatePeriod > 0) {
createMUPTimeout(minimumUpdatePeriod);
createMUPTimeout_() {
const mpl = this.masterPlaylistLoader_;
let mup = mpl.master && mpl.master.minimumUpdatePeriod;

// If the minimumUpdatePeriod has a value of 0, that indicates that the current
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// MPD has no future validity, so a new one will need to be acquired when new
// media segments are to be made available. Thus, we use the target duration
// in this case
} else if (minimumUpdatePeriod === 0) {
// If we haven't yet selected a playlist, wait until then so we know the
// target duration
if (!this.media()) {
this.one('loadedplaylist', () => {
createMUPTimeout(this.media().targetDuration * 1000);
});
if (mup === 0) {
if (mpl.media()) {
mup = mpl.media().targetDuration * 1000;
} else {
createMUPTimeout(this.media().targetDuration * 1000);
mpl.createMupOnMedia_ = mpl.updateMinimumUpdatePeriodTimeout_;
mpl.one('loadedmetadata', mpl.createMupOnMedia_);
}
}

// if minimumUpdatePeriod is invalid or <= zero skip creating a timeout
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In what cases can this happen? Removed to become a VOD?

It might be worth some log messages here.

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i'm honestly not sure, that's just what the original code assumed. I would think that it is removed as the source becomes a VOD, and I will clarify that in the comment.

if (typeof mup !== 'number' || mup <= 0) {
return;
}

mpl.minimumUpdatePeriodTimeout_ = window.setTimeout(() => {
mpl.minimumUpdatePeriodTimeout_ = null;
mpl.createMUPTimeout_();

// if a minimumUpdatePeriodTimeout_ was created again
// then the minimumUpdatePeriod was valid
// trigger minimumUpdatePeriod
if (mpl.minimumUpdatePeriodTimeout_) {
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mpl.trigger('minimumUpdatePeriod');
}
}, mup);
}

/**
Expand Down Expand Up @@ -791,10 +823,19 @@ export default class DashPlaylistLoader extends EventTarget {
this.trigger('playlistunchanged');
}

if (!this.media().endList) {
this.mediaUpdateTimeout = window.setTimeout(() => {
this.trigger('mediaupdatetimeout');
}, refreshDelay(this.media(), Boolean(mediaChanged)));
if (!this.mediaUpdateTimeout) {
const createMediaUpdateTimeout = () => {
if (this.media().endList) {
return;
}

this.mediaUpdateTimeout = window.setTimeout(() => {
this.trigger('mediaupdatetimeout');
createMediaUpdateTimeout();
}, refreshDelay(this.media(), Boolean(mediaChanged)));
};

createMediaUpdateTimeout();
}

this.trigger('loadedplaylist');
Expand Down
14 changes: 13 additions & 1 deletion src/master-playlist-controller.js
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Original file line number Diff line number Diff line change
Expand Up @@ -472,6 +472,14 @@ export class MasterPlaylistController extends videojs.EventTarget {

this.masterPlaylistLoader_.on('playlistunchanged', () => {
const updatedPlaylist = this.masterPlaylistLoader_.media();

// ignore unchanged playlists that have already been
// excluded for not-changing. We likely just have a really slowly updating
// playlist.
if (updatedPlaylist.lastExcludeReason_ === 'playlist-unchanged') {
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Is it also worth checking the last excludeUntil date to see if we're passed the point where the exclusion should be considered?

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🤷🏻 It might be but I think that playlist-unchanged excludes are not likely to stop happening no matter how much time has passed.

return;
}

const playlistOutdated = this.stuckAtPlaylistEnd_(updatedPlaylist);

if (playlistOutdated) {
Expand All @@ -480,7 +488,8 @@ export class MasterPlaylistController extends videojs.EventTarget {
// one is updating (and give the player a chance to re-adjust to the
// safe live point).
this.blacklistCurrentPlaylist({
message: 'Playlist no longer updating.'
message: 'Playlist no longer updating.',
reason: 'playlist-unchanged'
});
// useful for monitoring QoS
this.tech_.trigger('playliststuck');
Expand Down Expand Up @@ -1066,6 +1075,9 @@ export class MasterPlaylistController extends videojs.EventTarget {

// Blacklist this playlist
currentPlaylist.excludeUntil = Date.now() + (blacklistDuration * 1000);
if (error.reason) {
currentPlaylist.lastExcludeReason_ = error.reason;
}
this.tech_.trigger('blacklistplaylist');
this.tech_.trigger({type: 'usage', name: 'vhs-rendition-blacklisted'});
this.tech_.trigger({type: 'usage', name: 'hls-rendition-blacklisted'});
Expand Down