Press n or j to go to the next uncovered block, b, p or k for the previous block.
| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 | 8x 8x 16x 16x 8x 34x 34x 34x 34x 34x 3x 3x 3x 3x 5x 1x 4x 1x 1x 3x 6x 6x 5x 5x 5x 5x 5x 1x 5x 5x 5x 5x 5x 5x 5x 5x 5x 5x 5x | /*
* subtitle track controller
*/
import Event from '../events';
import EventHandler from '../event-handler';
import { logger } from '../utils/logger';
function filterSubtitleTracks (textTrackList) {
let tracks = [];
for (let i = 0; i < textTrackList.length; i++) {
Eif (textTrackList[i].kind === 'subtitles')
tracks.push(textTrackList[i]);
}
return tracks;
}
class SubtitleTrackController extends EventHandler {
constructor (hls) {
super(hls,
Event.MEDIA_ATTACHED,
Event.MEDIA_DETACHING,
Event.MANIFEST_LOADING,
Event.MANIFEST_LOADED,
Event.SUBTITLE_TRACK_LOADED);
this.tracks = [];
this.trackId = -1;
this.media = undefined;
/**
* @member {boolean} subtitleDisplay Enable/disable subtitle display rendering
*/
this.subtitleDisplay = false;
}
_onTextTracksChanged () {
// Media is undefined when switching streams via loadSource()
Iif (!this.media)
return;
let trackId = -1;
let tracks = filterSubtitleTracks(this.media.textTracks);
for (let id = 0; id < tracks.length; id++) {
if (tracks[id].mode === 'hidden') {
// Do not break in case there is a following track with showing.
trackId = id;
} else if (tracks[id].mode === 'showing') {
trackId = id;
break;
}
}
// Setting current subtitleTrack will invoke code.
this.subtitleTrack = trackId;
}
destroy () {
EventHandler.prototype.destroy.call(this);
}
// Listen for subtitle track change, then extract the current track ID.
onMediaAttached (data) {
this.media = data.media;
if (!this.media)
return;
if (this.queuedDefaultTrack !== undefined) {
this.subtitleTrack = this.queuedDefaultTrack;
delete this.queuedDefaultTrack;
}
this.trackChangeListener = this._onTextTracksChanged.bind(this);
this.useTextTrackPolling = !(this.media.textTracks && 'onchange' in this.media.textTracks);
if (this.useTextTrackPolling) {
this.subtitlePollingInterval = setInterval(() => {
this.trackChangeListener();
}, 500);
} else {
this.media.textTracks.addEventListener('change', this.trackChangeListener);
}
}
onMediaDetaching () {
if (!this.media)
return;
if (this.useTextTrackPolling)
clearInterval(this.subtitlePollingInterval);
else
this.media.textTracks.removeEventListener('change', this.trackChangeListener);
this.media = undefined;
}
// Reset subtitle tracks on manifest loading
onManifestLoading () {
this.tracks = [];
this.trackId = -1;
}
// Fired whenever a new manifest is loaded.
onManifestLoaded (data) {
let tracks = data.subtitles || [];
this.tracks = tracks;
this.trackId = -1;
this.hls.trigger(Event.SUBTITLE_TRACKS_UPDATED, { subtitleTracks: tracks });
// loop through available subtitle tracks and autoselect default if needed
// TODO: improve selection logic to handle forced, etc
tracks.forEach(track => {
if (track.default) {
// setting this.subtitleTrack will trigger internal logic
// if media has not been attached yet, it will fail
// we keep a reference to the default track id
// and we'll set subtitleTrack when onMediaAttached is triggered
if (this.media)
this.subtitleTrack = track.id;
else
this.queuedDefaultTrack = track.id;
}
});
}
// Trigger subtitle track playlist reload.
onTick () {
const trackId = this.trackId;
const subtitleTrack = this.tracks[trackId];
if (!subtitleTrack)
return;
const details = subtitleTrack.details;
// check if we need to load playlist for this subtitle Track
if (details === undefined || details.live === true) {
// track not retrieved yet, or live playlist we need to (re)load it
logger.log(`(re)loading playlist for subtitle track ${trackId}`);
this.hls.trigger(Event.SUBTITLE_TRACK_LOADING, { url: subtitleTrack.url, id: trackId });
}
}
onSubtitleTrackLoaded (data) {
if (data.id < this.tracks.length) {
logger.log(`subtitle track ${data.id} loaded`);
this.tracks[data.id].details = data.details;
// check if current playlist is a live playlist
if (data.details.live && !this.timer) {
// if live playlist we will have to reload it periodically
// set reload period to playlist target duration
this.timer = setInterval(() => {
this.onTick();
}, 1000 * data.details.targetduration, this);
}
if (!data.details.live && this.timer) {
// playlist is not live and timer is armed : stopping it
clearInterval(this.timer);
this.timer = null;
}
}
}
/** get alternate subtitle tracks list from playlist **/
get subtitleTracks () {
return this.tracks;
}
/** get index of the selected subtitle track (index in subtitle track lists) **/
get subtitleTrack () {
return this.trackId;
}
/** select a subtitle track, based on its index in subtitle track lists**/
set subtitleTrack (subtitleTrackId) {
if (this.trackId !== subtitleTrackId) { // || this.tracks[subtitleTrackId].details === undefined) {
this.setSubtitleTrackInternal(subtitleTrackId);
}
}
setSubtitleTrackInternal (newId) {
// check if level idx is valid
Iif (newId < -1 || newId >= this.tracks.length)
return;
// stopping live reloading timer if any
Iif (this.timer) {
clearInterval(this.timer);
this.timer = null;
}
let textTracks = filterSubtitleTracks(this.media.textTracks);
// hide currently enabled subtitle track
if (this.trackId !== -1)
textTracks[this.trackId].mode = 'disabled';
this.trackId = newId;
logger.log(`switching to subtitle track ${newId}`);
this.hls.trigger(Event.SUBTITLE_TRACK_SWITCH, { id: newId });
Iif (newId === -1)
return;
const subtitleTrack = this.tracks[newId];
Eif (newId < textTracks.length)
textTracks[newId].mode = this.subtitleDisplay ? 'showing' : 'hidden';
// check if we need to load playlist for this subtitle Track
let details = subtitleTrack.details;
Eif (details === undefined || details.live === true) {
// track not retrieved yet, or live playlist we need to (re)load it
logger.log(`(re)loading playlist for subtitle track ${newId}`);
this.hls.trigger(Event.SUBTITLE_TRACK_LOADING, { url: subtitleTrack.url, id: newId });
}
}
}
export default SubtitleTrackController;
|