/**
* @file tech.js
*/
import Component from '../component';
import mergeOptions from '../utils/merge-options.js';
import * as Fn from '../utils/fn.js';
import log from '../utils/log.js';
import { createTimeRange } from '../utils/time-ranges.js';
import { bufferedPercent } from '../utils/buffer.js';
import MediaError from '../media-error.js';
import window from 'global/window';
import document from 'global/document';
import {isPlain} from '../utils/obj';
import * as TRACK_TYPES from '../tracks/track-types';
import {toTitleCase, toLowerCase} from '../utils/string-cases.js';
import vtt from 'videojs-vtt.js';
import * as Guid from '../utils/guid.js';
/**
* An Object containing a structure like: `{src: 'url', type: 'mimetype'}` or string
* that just contains the src url alone.
* * `var SourceObject = {src: 'http://ex.com/video.mp4', type: 'video/mp4'};`
* `var SourceString = 'http://example.com/some-video.mp4';`
*
* @typedef {Object|string} Tech~SourceObject
*
* @property {string} src
* The url to the source
*
* @property {string} type
* The mime type of the source
*/
/**
* A function used by {@link Tech} to create a new {@link TextTrack}.
*
* @private
*
* @param {Tech} self
* An instance of the Tech class.
*
* @param {string} kind
* `TextTrack` kind (subtitles, captions, descriptions, chapters, or metadata)
*
* @param {string} [label]
* Label to identify the text track
*
* @param {string} [language]
* Two letter language abbreviation
*
* @param {Object} [options={}]
* An object with additional text track options
*
* @return {TextTrack}
* The text track that was created.
*/
function createTrackHelper(self, kind, label, language, options = {}) {
const tracks = self.textTracks();
options.kind = kind;
if (label) {
options.label = label;
}
if (language) {
options.language = language;
}
options.tech = self;
const track = new TRACK_TYPES.ALL.text.TrackClass(options);
tracks.addTrack(track);
return track;
}
/**
* This is the base class for media playback technology controllers, such as
* {@link HTML5}
*
* @extends Component
*/
class Tech extends Component {
/**
* Create an instance of this Tech.
*
* @param {Object} [options]
* The key/value store of player options.
*
* @param {Component~ReadyCallback} ready
* Callback function to call when the `HTML5` Tech is ready.
*/
constructor(options = {}, ready = function() {}) {
// we don't want the tech to report user activity automatically.
// This is done manually in addControlsListeners
options.reportTouchActivity = false;
super(null, options, ready);
this.onDurationChange_ = (e) => this.onDurationChange(e);
this.trackProgress_ = (e) => this.trackProgress(e);
this.trackCurrentTime_ = (e) => this.trackCurrentTime(e);
this.stopTrackingCurrentTime_ = (e) => this.stopTrackingCurrentTime(e);
this.disposeSourceHandler_ = (e) => this.disposeSourceHandler(e);
this.queuedHanders_ = new Set();
// keep track of whether the current source has played at all to
// implement a very limited played()
this.hasStarted_ = false;
this.on('playing', function() {
this.hasStarted_ = true;
});
this.on('loadstart', function() {
this.hasStarted_ = false;
});
TRACK_TYPES.ALL.names.forEach((name) => {
const props = TRACK_TYPES.ALL[name];
if (options && options[props.getterName]) {
this[props.privateName] = options[props.getterName];
}
});
// Manually track progress in cases where the browser/tech doesn't report it.
if (!this.featuresProgressEvents) {
this.manualProgressOn();
}
// Manually track timeupdates in cases where the browser/tech doesn't report it.
if (!this.featuresTimeupdateEvents) {
this.manualTimeUpdatesOn();
}
['Text', 'Audio', 'Video'].forEach((track) => {
if (options[`native${track}Tracks`] === false) {
this[`featuresNative${track}Tracks`] = false;
}
});
if (options.nativeCaptions === false || options.nativeTextTracks === false) {
this.featuresNativeTextTracks = false;
} else if (options.nativeCaptions === true || options.nativeTextTracks === true) {
this.featuresNativeTextTracks = true;
}
if (!this.featuresNativeTextTracks) {
this.emulateTextTracks();
}
this.preloadTextTracks = options.preloadTextTracks !== false;
this.autoRemoteTextTracks_ = new TRACK_TYPES.ALL.text.ListClass();
this.initTrackListeners();
// Turn on component tap events only if not using native controls
if (!options.nativeControlsForTouch) {
this.emitTapEvents();
}
if (this.constructor) {
this.name_ = this.constructor.name || 'Unknown Tech';
}
}
/**
* A special function to trigger source set in a way that will allow player
* to re-trigger if the player or tech are not ready yet.
*
* @fires Tech#sourceset
* @param {string} src The source string at the time of the source changing.
*/
triggerSourceset(src) {
if (!this.isReady_) {
// on initial ready we have to trigger source set
// 1ms after ready so that player can watch for it.
this.one('ready', () => this.setTimeout(() => this.triggerSourceset(src), 1));
}
/**
* Fired when the source is set on the tech causing the media element
* to reload.
*
* @see {@link Player#event:sourceset}
* @event Tech#sourceset
* @type {EventTarget~Event}
*/
this.trigger({
src,
type: 'sourceset'
});
}
/* Fallbacks for unsupported event types
================================================================================ */
/**
* Polyfill the `progress` event for browsers that don't support it natively.
*
* @see {@link Tech#trackProgress}
*/
manualProgressOn() {
this.on('durationchange', this.onDurationChange_);
this.manualProgress = true;
// Trigger progress watching when a source begins loading
this.one('ready', this.trackProgress_);
}
/**
* Turn off the polyfill for `progress` events that was created in
* {@link Tech#manualProgressOn}
*/
manualProgressOff() {
this.manualProgress = false;
this.stopTrackingProgress();
this.off('durationchange', this.onDurationChange_);
}
/**
* This is used to trigger a `progress` event when the buffered percent changes. It
* sets an interval function that will be called every 500 milliseconds to check if the
* buffer end percent has changed.
*
* > This function is called by {@link Tech#manualProgressOn}
*
* @param {EventTarget~Event} event
* The `ready` event that caused this to run.
*
* @listens Tech#ready
* @fires Tech#progress
*/
trackProgress(event) {
this.stopTrackingProgress();
this.progressInterval = this.setInterval(Fn.bind(this, function() {
// Don't trigger unless buffered amount is greater than last time
const numBufferedPercent = this.bufferedPercent();
if (this.bufferedPercent_ !== numBufferedPercent) {
/**
* See {@link Player#progress}
*
* @event Tech#progress
* @type {EventTarget~Event}
*/
this.trigger('progress');
}
this.bufferedPercent_ = numBufferedPercent;
if (numBufferedPercent === 1) {
this.stopTrackingProgress();
}
}), 500);
}
/**
* Update our internal duration on a `durationchange` event by calling
* {@link Tech#duration}.
*
* @param {EventTarget~Event} event
* The `durationchange` event that caused this to run.
*
* @listens Tech#durationchange
*/
onDurationChange(event) {
this.duration_ = this.duration();
}
/**
* Get and create a `TimeRange` object for buffering.
*
* @return {TimeRange}
* The time range object that was created.
*/
buffered() {
return createTimeRange(0, 0);
}
/**
* Get the percentage of the current video that is currently buffered.
*
* @return {number}
* A number from 0 to 1 that represents the decimal percentage of the
* video that is buffered.
*
*/
bufferedPercent() {
return bufferedPercent(this.buffered(), this.duration_);
}
/**
* Turn off the polyfill for `progress` events that was created in
* {@link Tech#manualProgressOn}
* Stop manually tracking progress events by clearing the interval that was set in
* {@link Tech#trackProgress}.
*/
stopTrackingProgress() {
this.clearInterval(this.progressInterval);
}
/**
* Polyfill the `timeupdate` event for browsers that don't support it.
*
* @see {@link Tech#trackCurrentTime}
*/
manualTimeUpdatesOn() {
this.manualTimeUpdates = true;
this.on('play', this.trackCurrentTime_);
this.on('pause', this.stopTrackingCurrentTime_);
}
/**
* Turn off the polyfill for `timeupdate` events that was created in
* {@link Tech#manualTimeUpdatesOn}
*/
manualTimeUpdatesOff() {
this.manualTimeUpdates = false;
this.stopTrackingCurrentTime();
this.off('play', this.trackCurrentTime_);
this.off('pause', this.stopTrackingCurrentTime_);
}
/**
* Sets up an interval function to track current time and trigger `timeupdate` every
* 250 milliseconds.
*
* @listens Tech#play
* @triggers Tech#timeupdate
*/
trackCurrentTime() {
if (this.currentTimeInterval) {
this.stopTrackingCurrentTime();
}
this.currentTimeInterval = this.setInterval(function() {
/**
* Triggered at an interval of 250ms to indicated that time is passing in the video.
*
* @event Tech#timeupdate
* @type {EventTarget~Event}
*/
this.trigger({ type: 'timeupdate', target: this, manuallyTriggered: true });
// 42 = 24 fps // 250 is what Webkit uses // FF uses 15
}, 250);
}
/**
* Stop the interval function created in {@link Tech#trackCurrentTime} so that the
* `timeupdate` event is no longer triggered.
*
* @listens {Tech#pause}
*/
stopTrackingCurrentTime() {
this.clearInterval(this.currentTimeInterval);
// #1002 - if the video ends right before the next timeupdate would happen,
// the progress bar won't make it all the way to the end
this.trigger({ type: 'timeupdate', target: this, manuallyTriggered: true });
}
/**
* Turn off all event polyfills, clear the `Tech`s {@link AudioTrackList},
* {@link VideoTrackList}, and {@link TextTrackList}, and dispose of this Tech.
*
* @fires Component#dispose
*/
dispose() {
// clear out all tracks because we can't reuse them between techs
this.clearTracks(TRACK_TYPES.NORMAL.names);
// Turn off any manual progress or timeupdate tracking
if (this.manualProgress) {
this.manualProgressOff();
}
if (this.manualTimeUpdates) {
this.manualTimeUpdatesOff();
}
super.dispose();
}
/**
* Clear out a single `TrackList` or an array of `TrackLists` given their names.
*
* > Note: Techs without source handlers should call this between sources for `video`
* & `audio` tracks. You don't want to use them between tracks!
*
* @param {string[]|string} types
* TrackList names to clear, valid names are `video`, `audio`, and
* `text`.
*/
clearTracks(types) {
types = [].concat(types);
// clear out all tracks because we can't reuse them between techs
types.forEach((type) => {
const list = this[`${type}Tracks`]() || [];
let i = list.length;
while (i--) {
const track = list[i];
if (type === 'text') {
this.removeRemoteTextTrack(track);
}
list.removeTrack(track);
}
});
}
/**
* Remove any TextTracks added via addRemoteTextTrack that are
* flagged for automatic garbage collection
*/
cleanupAutoTextTracks() {
const list = this.autoRemoteTextTracks_ || [];
let i = list.length;
while (i--) {
const track = list[i];
this.removeRemoteTextTrack(track);
}
}
/**
* Reset the tech, which will removes all sources and reset the internal readyState.
*
* @abstract
*/
reset() {}
/**
* Get the value of `crossOrigin` from the tech.
*
* @abstract
*
* @see {Html5#crossOrigin}
*/
crossOrigin() {}
/**
* Set the value of `crossOrigin` on the tech.
*
* @abstract
*
* @param {string} crossOrigin the crossOrigin value
* @see {Html5#setCrossOrigin}
*/
setCrossOrigin() {}
/**
* Get or set an error on the Tech.
*
* @param {MediaError} [err]
* Error to set on the Tech
*
* @return {MediaError|null}
* The current error object on the tech, or null if there isn't one.
*/
error(err) {
if (err !== undefined) {
this.error_ = new MediaError(err);
this.trigger('error');
}
return this.error_;
}
/**
* Returns the `TimeRange`s that have been played through for the current source.
*
* > NOTE: This implementation is incomplete. It does not track the played `TimeRange`.
* It only checks whether the source has played at all or not.
*
* @return {TimeRange}
* - A single time range if this video has played
* - An empty set of ranges if not.
*/
played() {
if (this.hasStarted_) {
return createTimeRange(0, 0);
}
return createTimeRange();
}
/**
* Start playback
*
* @abstract
*
* @see {Html5#play}
*/
play() {}
/**
* Set whether we are scrubbing or not
*
* @abstract
*
* @see {Html5#setScrubbing}
*/
setScrubbing() {}
/**
* Get whether we are scrubbing or not
*
* @abstract
*
* @see {Html5#scrubbing}
*/
scrubbing() {}
/**
* Causes a manual time update to occur if {@link Tech#manualTimeUpdatesOn} was
* previously called.
*
* @fires Tech#timeupdate
*/
setCurrentTime() {
// improve the accuracy of manual timeupdates
if (this.manualTimeUpdates) {
/**
* A manual `timeupdate` event.
*
* @event Tech#timeupdate
* @type {EventTarget~Event}
*/
this.trigger({ type: 'timeupdate', target: this, manuallyTriggered: true });
}
}
/**
* Turn on listeners for {@link VideoTrackList}, {@link {AudioTrackList}, and
* {@link TextTrackList} events.
*
* This adds {@link EventTarget~EventListeners} for `addtrack`, and `removetrack`.
*
* @fires Tech#audiotrackchange
* @fires Tech#videotrackchange
* @fires Tech#texttrackchange
*/
initTrackListeners() {
/**
* Triggered when tracks are added or removed on the Tech {@link AudioTrackList}
*
* @event Tech#audiotrackchange
* @type {EventTarget~Event}
*/
/**
* Triggered when tracks are added or removed on the Tech {@link VideoTrackList}
*
* @event Tech#videotrackchange
* @type {EventTarget~Event}
*/
/**
* Triggered when tracks are added or removed on the Tech {@link TextTrackList}
*
* @event Tech#texttrackchange
* @type {EventTarget~Event}
*/
TRACK_TYPES.NORMAL.names.forEach((name) => {
const props = TRACK_TYPES.NORMAL[name];
const trackListChanges = () => {
this.trigger(`${name}trackchange`);
};
const tracks = this[props.getterName]();
tracks.addEventListener('removetrack', trackListChanges);
tracks.addEventListener('addtrack', trackListChanges);
this.on('dispose', () => {
tracks.removeEventListener('removetrack', trackListChanges);
tracks.removeEventListener('addtrack', trackListChanges);
});
});
}
/**
* Emulate TextTracks using vtt.js if necessary
*
* @fires Tech#vttjsloaded
* @fires Tech#vttjserror
*/
addWebVttScript_() {
if (window.WebVTT) {
return;
}
// Initially, Tech.el_ is a child of a dummy-div wait until the Component system
// signals that the Tech is ready at which point Tech.el_ is part of the DOM
// before inserting the WebVTT script
if (document.body.contains(this.el())) {
// load via require if available and vtt.js script location was not passed in
// as an option. novtt builds will turn the above require call into an empty object
// which will cause this if check to always fail.
if (!this.options_['vtt.js'] && isPlain(vtt) && Object.keys(vtt).length > 0) {
this.trigger('vttjsloaded');
return;
}
// load vtt.js via the script location option or the cdn of no location was
// passed in
const script = document.createElement('script');
script.src = this.options_['vtt.js'] || 'https://vjs.zencdn.net/vttjs/0.14.1/vtt.min.js';
script.onload = () => {
/**
* Fired when vtt.js is loaded.
*
* @event Tech#vttjsloaded
* @type {EventTarget~Event}
*/
this.trigger('vttjsloaded');
};
script.onerror = () => {
/**
* Fired when vtt.js was not loaded due to an error
*
* @event Tech#vttjsloaded
* @type {EventTarget~Event}
*/
this.trigger('vttjserror');
};
this.on('dispose', () => {
script.onload = null;
script.onerror = null;
});
// but have not loaded yet and we set it to true before the inject so that
// we don't overwrite the injected window.WebVTT if it loads right away
window.WebVTT = true;
this.el().parentNode.appendChild(script);
} else {
this.ready(this.addWebVttScript_);
}
}
/**
* Emulate texttracks
*
*/
emulateTextTracks() {
const tracks = this.textTracks();
const remoteTracks = this.remoteTextTracks();
const handleAddTrack = (e) => tracks.addTrack(e.track);
const handleRemoveTrack = (e) => tracks.removeTrack(e.track);
remoteTracks.on('addtrack', handleAddTrack);
remoteTracks.on('removetrack', handleRemoveTrack);
this.addWebVttScript_();
const updateDisplay = () => this.trigger('texttrackchange');
const textTracksChanges = () => {
updateDisplay();
for (let i = 0; i < tracks.length; i++) {
const track = tracks[i];
track.removeEventListener('cuechange', updateDisplay);
if (track.mode === 'showing') {
track.addEventListener('cuechange', updateDisplay);
}
}
};
textTracksChanges();
tracks.addEventListener('change', textTracksChanges);
tracks.addEventListener('addtrack', textTracksChanges);
tracks.addEventListener('removetrack', textTracksChanges);
this.on('dispose', function() {
remoteTracks.off('addtrack', handleAddTrack);
remoteTracks.off('removetrack', handleRemoveTrack);
tracks.removeEventListener('change', textTracksChanges);
tracks.removeEventListener('addtrack', textTracksChanges);
tracks.removeEventListener('removetrack', textTracksChanges);
for (let i = 0; i < tracks.length; i++) {
const track = tracks[i];
track.removeEventListener('cuechange', updateDisplay);
}
});
}
/**
* Create and returns a remote {@link TextTrack} object.
*
* @param {string} kind
* `TextTrack` kind (subtitles, captions, descriptions, chapters, or metadata)
*
* @param {string} [label]
* Label to identify the text track
*
* @param {string} [language]
* Two letter language abbreviation
*
* @return {TextTrack}
* The TextTrack that gets created.
*/
addTextTrack(kind, label, language) {
if (!kind) {
throw new Error('TextTrack kind is required but was not provided');
}
return createTrackHelper(this, kind, label, language);
}
/**
* Create an emulated TextTrack for use by addRemoteTextTrack
*
* This is intended to be overridden by classes that inherit from
* Tech in order to create native or custom TextTracks.
*
* @param {Object} options
* The object should contain the options to initialize the TextTrack with.
*
* @param {string} [options.kind]
* `TextTrack` kind (subtitles, captions, descriptions, chapters, or metadata).
*
* @param {string} [options.label].
* Label to identify the text track
*
* @param {string} [options.language]
* Two letter language abbreviation.
*
* @return {HTMLTrackElement}
* The track element that gets created.
*/
createRemoteTextTrack(options) {
const track = mergeOptions(options, {
tech: this
});
return new TRACK_TYPES.REMOTE.remoteTextEl.TrackClass(track);
}
/**
* Creates a remote text track object and returns an html track element.
*
* > Note: This can be an emulated {@link HTMLTrackElement} or a native one.
*
* @param {Object} options
* See {@link Tech#createRemoteTextTrack} for more detailed properties.
*
* @param {boolean} [manualCleanup=true]
* - When false: the TextTrack will be automatically removed from the video
* element whenever the source changes
* - When True: The TextTrack will have to be cleaned up manually
*
* @return {HTMLTrackElement}
* An Html Track Element.
*
* @deprecated The default functionality for this function will be equivalent
* to "manualCleanup=false" in the future. The manualCleanup parameter will
* also be removed.
*/
addRemoteTextTrack(options = {}, manualCleanup) {
const htmlTrackElement = this.createRemoteTextTrack(options);
if (manualCleanup !== true && manualCleanup !== false) {
// deprecation warning
log.warn('Calling addRemoteTextTrack without explicitly setting the "manualCleanup" parameter to `true` is deprecated and default to `false` in future version of video.js');
manualCleanup = true;
}
// store HTMLTrackElement and TextTrack to remote list
this.remoteTextTrackEls().addTrackElement_(htmlTrackElement);
this.remoteTextTracks().addTrack(htmlTrackElement.track);
if (manualCleanup !== true) {
// create the TextTrackList if it doesn't exist
this.ready(() => this.autoRemoteTextTracks_.addTrack(htmlTrackElement.track));
}
return htmlTrackElement;
}
/**
* Remove a remote text track from the remote `TextTrackList`.
*
* @param {TextTrack} track
* `TextTrack` to remove from the `TextTrackList`
*/
removeRemoteTextTrack(track) {
const trackElement = this.remoteTextTrackEls().getTrackElementByTrack_(track);
// remove HTMLTrackElement and TextTrack from remote list
this.remoteTextTrackEls().removeTrackElement_(trackElement);
this.remoteTextTracks().removeTrack(track);
this.autoRemoteTextTracks_.removeTrack(track);
}
/**
* Gets available media playback quality metrics as specified by the W3C's Media
* Playback Quality API.
*
* @see [Spec]{@link https://wicg.github.io/media-playback-quality}
*
* @return {Object}
* An object with supported media playback quality metrics
*
* @abstract
*/
getVideoPlaybackQuality() {
return {};
}
/**
* Attempt to create a floating video window always on top of other windows
* so that users may continue consuming media while they interact with other
* content sites, or applications on their device.
*
* @see [Spec]{@link https://wicg.github.io/picture-in-picture}
*
* @return {Promise|undefined}
* A promise with a Picture-in-Picture window if the browser supports
* Promises (or one was passed in as an option). It returns undefined
* otherwise.
*
* @abstract
*/
requestPictureInPicture() {
const PromiseClass = this.options_.Promise || window.Promise;
if (PromiseClass) {
return PromiseClass.reject();
}
}
/**
* A method to check for the value of the 'disablePictureInPicture' <video> property.
* Defaults to true, as it should be considered disabled if the tech does not support pip
*
* @abstract
*/
disablePictureInPicture() {
return true;
}
/**
* A method to set or unset the 'disablePictureInPicture' <video> property.
*
* @abstract
*/
setDisablePictureInPicture() {}
/**
* A fallback implementation of requestVideoFrameCallback using requestAnimationFrame
*
* @param {function} cb
* @return {number} request id
*/
requestVideoFrameCallback(cb) {
const id = Guid.newGUID();
if (!this.isReady_ || this.paused()) {
this.queuedHanders_.add(id);
this.one('playing', () => {
if (this.queuedHanders_.has(id)) {
this.queuedHanders_.delete(id);
cb();
}
});
} else {
this.requestNamedAnimationFrame(id, cb);
}
return id;
}
/**
* A fallback implementation of cancelVideoFrameCallback
*
* @param {number} id id of callback to be cancelled
*/
cancelVideoFrameCallback(id) {
if (this.queuedHanders_.has(id)) {
this.queuedHanders_.delete(id);
} else {
this.cancelNamedAnimationFrame(id);
}
}
/**
* A method to set a poster from a `Tech`.
*
* @abstract
*/
setPoster() {}
/**
* A method to check for the presence of the 'playsinline' <video> attribute.
*
* @abstract
*/
playsinline() {}
/**
* A method to set or unset the 'playsinline' <video> attribute.
*
* @abstract
*/
setPlaysinline() {}
/**
* Attempt to force override of native audio tracks.
*
* @param {boolean} override - If set to true native audio will be overridden,
* otherwise native audio will potentially be used.
*
* @abstract
*/
overrideNativeAudioTracks() {}
/**
* Attempt to force override of native video tracks.
*
* @param {boolean} override - If set to true native video will be overridden,
* otherwise native video will potentially be used.
*
* @abstract
*/
overrideNativeVideoTracks() {}
/*
* Check if the tech can support the given mime-type.
*
* The base tech does not support any type, but source handlers might
* overwrite this.
*
* @param {string} type
* The mimetype to check for support
*
* @return {string}
* 'probably', 'maybe', or empty string
*
* @see [Spec]{@link https://developer.mozilla.org/en-US/docs/Web/API/HTMLMediaElement/canPlayType}
*
* @abstract
*/
canPlayType() {
return '';
}
/**
* Check if the type is supported by this tech.
*
* The base tech does not support any type, but source handlers might
* overwrite this.
*
* @param {string} type
* The media type to check
* @return {string} Returns the native video element's response
*/
static canPlayType() {
return '';
}
/**
* Check if the tech can support the given source
*
* @param {Object} srcObj
* The source object
* @param {Object} options
* The options passed to the tech
* @return {string} 'probably', 'maybe', or '' (empty string)
*/
static canPlaySource(srcObj, options) {
return Tech.canPlayType(srcObj.type);
}
/*
* Return whether the argument is a Tech or not.
* Can be passed either a Class like `Html5` or a instance like `player.tech_`
*
* @param {Object} component
* The item to check
*
* @return {boolean}
* Whether it is a tech or not
* - True if it is a tech
* - False if it is not
*/
static isTech(component) {
return component.prototype instanceof Tech ||
component instanceof Tech ||
component === Tech;
}
/**
* Registers a `Tech` into a shared list for videojs.
*
* @param {string} name
* Name of the `Tech` to register.
*
* @param {Object} tech
* The `Tech` class to register.
*/
static registerTech(name, tech) {
if (!Tech.techs_) {
Tech.techs_ = {};
}
if (!Tech.isTech(tech)) {
throw new Error(`Tech ${name} must be a Tech`);
}
if (!Tech.canPlayType) {
throw new Error('Techs must have a static canPlayType method on them');
}
if (!Tech.canPlaySource) {
throw new Error('Techs must have a static canPlaySource method on them');
}
name = toTitleCase(name);
Tech.techs_[name] = tech;
Tech.techs_[toLowerCase(name)] = tech;
if (name !== 'Tech') {
// camel case the techName for use in techOrder
Tech.defaultTechOrder_.push(name);
}
return tech;
}
/**
* Get a `Tech` from the shared list by name.
*
* @param {string} name
* `camelCase` or `TitleCase` name of the Tech to get
*
* @return {Tech|undefined}
* The `Tech` or undefined if there was no tech with the name requested.
*/
static getTech(name) {
if (!name) {
return;
}
if (Tech.techs_ && Tech.techs_[name]) {
return Tech.techs_[name];
}
name = toTitleCase(name);
if (window && window.videojs && window.videojs[name]) {
log.warn(`The ${name} tech was added to the videojs object when it should be registered using videojs.registerTech(name, tech)`);
return window.videojs[name];
}
}
}
/**
* Get the {@link VideoTrackList}
*
* @returns {VideoTrackList}
* @method Tech.prototype.videoTracks
*/
/**
* Get the {@link AudioTrackList}
*
* @returns {AudioTrackList}
* @method Tech.prototype.audioTracks
*/
/**
* Get the {@link TextTrackList}
*
* @returns {TextTrackList}
* @method Tech.prototype.textTracks
*/
/**
* Get the remote element {@link TextTrackList}
*
* @returns {TextTrackList}
* @method Tech.prototype.remoteTextTracks
*/
/**
* Get the remote element {@link HtmlTrackElementList}
*
* @returns {HtmlTrackElementList}
* @method Tech.prototype.remoteTextTrackEls
*/
TRACK_TYPES.ALL.names.forEach(function(name) {
const props = TRACK_TYPES.ALL[name];
Tech.prototype[props.getterName] = function() {
this[props.privateName] = this[props.privateName] || new props.ListClass();
return this[props.privateName];
};
});
/**
* List of associated text tracks
*
* @type {TextTrackList}
* @private
* @property Tech#textTracks_
*/
/**
* List of associated audio tracks.
*
* @type {AudioTrackList}
* @private
* @property Tech#audioTracks_
*/
/**
* List of associated video tracks.
*
* @type {VideoTrackList}
* @private
* @property Tech#videoTracks_
*/
/**
* Boolean indicating whether the `Tech` supports volume control.
*
* @type {boolean}
* @default
*/
Tech.prototype.featuresVolumeControl = true;
/**
* Boolean indicating whether the `Tech` supports muting volume.
*
* @type {bolean}
* @default
*/
Tech.prototype.featuresMuteControl = true;
/**
* Boolean indicating whether the `Tech` supports fullscreen resize control.
* Resizing plugins using request fullscreen reloads the plugin
*
* @type {boolean}
* @default
*/
Tech.prototype.featuresFullscreenResize = false;
/**
* Boolean indicating whether the `Tech` supports changing the speed at which the video
* plays. Examples:
* - Set player to play 2x (twice) as fast
* - Set player to play 0.5x (half) as fast
*
* @type {boolean}
* @default
*/
Tech.prototype.featuresPlaybackRate = false;
/**
* Boolean indicating whether the `Tech` supports the `progress` event. This is currently
* not triggered by video-js-swf. This will be used to determine if
* {@link Tech#manualProgressOn} should be called.
*
* @type {boolean}
* @default
*/
Tech.prototype.featuresProgressEvents = false;
/**
* Boolean indicating whether the `Tech` supports the `sourceset` event.
*
* A tech should set this to `true` and then use {@link Tech#triggerSourceset}
* to trigger a {@link Tech#event:sourceset} at the earliest time after getting
* a new source.
*
* @type {boolean}
* @default
*/
Tech.prototype.featuresSourceset = false;
/**
* Boolean indicating whether the `Tech` supports the `timeupdate` event. This is currently
* not triggered by video-js-swf. This will be used to determine if
* {@link Tech#manualTimeUpdates} should be called.
*
* @type {boolean}
* @default
*/
Tech.prototype.featuresTimeupdateEvents = false;
/**
* Boolean indicating whether the `Tech` supports the native `TextTrack`s.
* This will help us integrate with native `TextTrack`s if the browser supports them.
*
* @type {boolean}
* @default
*/
Tech.prototype.featuresNativeTextTracks = false;
/**
* Boolean indicating whether the `Tech` supports `requestVideoFrameCallback`.
*
* @type {boolean}
* @default
*/
Tech.prototype.featuresVideoFrameCallback = false;
/**
* A functional mixin for techs that want to use the Source Handler pattern.
* Source handlers are scripts for handling specific formats.
* The source handler pattern is used for adaptive formats (HLS, DASH) that
* manually load video data and feed it into a Source Buffer (Media Source Extensions)
* Example: `Tech.withSourceHandlers.call(MyTech);`
*
* @param {Tech} _Tech
* The tech to add source handler functions to.
*
* @mixes Tech~SourceHandlerAdditions
*/
Tech.withSourceHandlers = function(_Tech) {
/**
* Register a source handler
*
* @param {Function} handler
* The source handler class
*
* @param {number} [index]
* Register it at the following index
*/
_Tech.registerSourceHandler = function(handler, index) {
let handlers = _Tech.sourceHandlers;
if (!handlers) {
handlers = _Tech.sourceHandlers = [];
}
if (index === undefined) {
// add to the end of the list
index = handlers.length;
}
handlers.splice(index, 0, handler);
};
/**
* Check if the tech can support the given type. Also checks the
* Techs sourceHandlers.
*
* @param {string} type
* The mimetype to check.
*
* @return {string}
* 'probably', 'maybe', or '' (empty string)
*/
_Tech.canPlayType = function(type) {
const handlers = _Tech.sourceHandlers || [];
let can;
for (let i = 0; i < handlers.length; i++) {
can = handlers[i].canPlayType(type);
if (can) {
return can;
}
}
return '';
};
/**
* Returns the first source handler that supports the source.
*
* TODO: Answer question: should 'probably' be prioritized over 'maybe'
*
* @param {Tech~SourceObject} source
* The source object
*
* @param {Object} options
* The options passed to the tech
*
* @return {SourceHandler|null}
* The first source handler that supports the source or null if
* no SourceHandler supports the source
*/
_Tech.selectSourceHandler = function(source, options) {
const handlers = _Tech.sourceHandlers || [];
let can;
for (let i = 0; i < handlers.length; i++) {
can = handlers[i].canHandleSource(source, options);
if (can) {
return handlers[i];
}
}
return null;
};
/**
* Check if the tech can support the given source.
*
* @param {Tech~SourceObject} srcObj
* The source object
*
* @param {Object} options
* The options passed to the tech
*
* @return {string}
* 'probably', 'maybe', or '' (empty string)
*/
_Tech.canPlaySource = function(srcObj, options) {
const sh = _Tech.selectSourceHandler(srcObj, options);
if (sh) {
return sh.canHandleSource(srcObj, options);
}
return '';
};
/**
* When using a source handler, prefer its implementation of
* any function normally provided by the tech.
*/
const deferrable = [
'seekable',
'seeking',
'duration'
];
/**
* A wrapper around {@link Tech#seekable} that will call a `SourceHandler`s seekable
* function if it exists, with a fallback to the Techs seekable function.
*
* @method _Tech.seekable
*/
/**
* A wrapper around {@link Tech#duration} that will call a `SourceHandler`s duration
* function if it exists, otherwise it will fallback to the techs duration function.
*
* @method _Tech.duration
*/
deferrable.forEach(function(fnName) {
const originalFn = this[fnName];
if (typeof originalFn !== 'function') {
return;
}
this[fnName] = function() {
if (this.sourceHandler_ && this.sourceHandler_[fnName]) {
return this.sourceHandler_[fnName].apply(this.sourceHandler_, arguments);
}
return originalFn.apply(this, arguments);
};
}, _Tech.prototype);
/**
* Create a function for setting the source using a source object
* and source handlers.
* Should never be called unless a source handler was found.
*
* @param {Tech~SourceObject} source
* A source object with src and type keys
*/
_Tech.prototype.setSource = function(source) {
let sh = _Tech.selectSourceHandler(source, this.options_);
if (!sh) {
// Fall back to a native source hander when unsupported sources are
// deliberately set
if (_Tech.nativeSourceHandler) {
sh = _Tech.nativeSourceHandler;
} else {
log.error('No source handler found for the current source.');
}
}
// Dispose any existing source handler
this.disposeSourceHandler();
this.off('dispose', this.disposeSourceHandler_);
if (sh !== _Tech.nativeSourceHandler) {
this.currentSource_ = source;
}
this.sourceHandler_ = sh.handleSource(source, this, this.options_);
this.one('dispose', this.disposeSourceHandler_);
};
/**
* Clean up any existing SourceHandlers and listeners when the Tech is disposed.
*
* @listens Tech#dispose
*/
_Tech.prototype.disposeSourceHandler = function() {
// if we have a source and get another one
// then we are loading something new
// than clear all of our current tracks
if (this.currentSource_) {
this.clearTracks(['audio', 'video']);
this.currentSource_ = null;
}
// always clean up auto-text tracks
this.cleanupAutoTextTracks();
if (this.sourceHandler_) {
if (this.sourceHandler_.dispose) {
this.sourceHandler_.dispose();
}
this.sourceHandler_ = null;
}
};
};
// The base Tech class needs to be registered as a Component. It is the only
// Tech that can be registered as a Component.
Component.registerComponent('Tech', Tech);
Tech.registerTech('Tech', Tech);
/**
* A list of techs that should be added to techOrder on Players
*
* @private
*/
Tech.defaultTechOrder_ = [];
export default Tech;