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* The copyright in this software is being made available under the BSD License,
* included below. This software may be subject to other third party and contributor
* rights, including patent rights, and no such rights are granted under this license.
*
* Copyright (c) 2013, Dash Industry Forum.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without modification,
* are permitted provided that the following conditions are met:
* * Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation and/or
* other materials provided with the distribution.
* * Neither the name of Dash Industry Forum nor the names of its
* contributors may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS AS IS AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
import FactoryMaker from '../../core/FactoryMaker.js';
import EventBus from '../../core/EventBus.js';
import Events from '../../core/events/Events.js';
import Debug from '../../core/Debug.js';
import Constants from '../constants/Constants.js';
import Settings from '../../core/Settings.js';
const READY_STATES_TO_EVENT_NAMES = new Map([
[Constants.VIDEO_ELEMENT_READY_STATES.HAVE_METADATA, 'loadedmetadata'],
[Constants.VIDEO_ELEMENT_READY_STATES.HAVE_CURRENT_DATA, 'loadeddata'],
[Constants.VIDEO_ELEMENT_READY_STATES.HAVE_FUTURE_DATA, 'canplay'],
[Constants.VIDEO_ELEMENT_READY_STATES.HAVE_ENOUGH_DATA, 'canplaythrough']
]);
function VideoModel() {
let TTMLRenderingDiv,
_currentTime,
element,
instance,
logger,
previousPlaybackRate,
resizeObserver,
resumeReadyStateFunction,
setCurrentTimeReadyStateFunction,
settings,
timeout,
vttRenderingDiv;
const VIDEO_MODEL_WRONG_ELEMENT_TYPE = 'element is not video or audio DOM type!';
const context = this.context;
const eventBus = EventBus(context).getInstance();
const stalledStreams = [];
function setup() {
logger = Debug(context).getInstance().getLogger(instance);
settings = Settings(context).getInstance();
_currentTime = NaN;
_createResizeObserver();
}
function _createResizeObserver() {
try {
resizeObserver = new ResizeObserver(() => {
eventBus.trigger(Events.VIDEO_ELEMENT_RESIZED);
});
} catch (e) {
}
}
function initialize() {
eventBus.on(Events.PLAYBACK_PLAYING, onPlaying, this);
}
function reset() {
clearTimeout(timeout);
eventBus.off(Events.PLAYBACK_PLAYING, onPlaying, this);
stalledStreams.length = 0;
_disposeResizeObserver();
}
function _disposeResizeObserver() {
try {
if (resizeObserver && element) {
resizeObserver.unobserve(element);
resizeObserver.disconnect();
resizeObserver = null;
}
} catch (e) {
}
}
function setConfig(config) {
Iif (!config) {
return;
}
if (config.settings) {
settings = config.settings;
}
}
function setPlaybackRate(value, ignoreReadyState = false) {
if (!element) {
return;
}
if (ignoreReadyState) {
element.playbackRate = value;
return;
}
// If media element hasn't loaded enough data to play yet, wait until it has
waitForReadyState(Constants.VIDEO_ELEMENT_READY_STATES.HAVE_FUTURE_DATA, () => {
element.playbackRate = value;
});
}
//TODO Move the DVR window calculations from MediaPlayer to Here.
function setCurrentTime(currentTime, stickToBuffered) {
if (element) {
if (setCurrentTimeReadyStateFunction && setCurrentTimeReadyStateFunction.func && setCurrentTimeReadyStateFunction.event) {
removeEventListener(setCurrentTimeReadyStateFunction.event, setCurrentTimeReadyStateFunction.func);
}
_currentTime = currentTime;
setCurrentTimeReadyStateFunction = waitForReadyState(Constants.VIDEO_ELEMENT_READY_STATES.HAVE_METADATA, () => {
if (!element) {
return;
}
// We don't set the same currentTime because it can cause firing unexpected Pause event in IE11
// providing playbackRate property equals to zero.
if (element.currentTime === _currentTime) {
_currentTime = NaN;
return;
}
// TODO Despite the fact that MediaSource 'open' event has been fired IE11 cannot set videoElement.currentTime
// immediately (it throws InvalidStateError). It seems that this is related to videoElement.readyState property
// Initially it is 0, but soon after 'open' event it goes to 1 and setting currentTime is allowed. Chrome allows to
// set currentTime even if readyState = 0.
// setTimeout is used to workaround InvalidStateError in IE11
try {
_currentTime = stickToBuffered ? stickTimeToBuffered(_currentTime) : _currentTime;
if (!isNaN(_currentTime)) {
element.currentTime = _currentTime;
}
_currentTime = NaN;
} catch (e) {
if (element.readyState === 0 && e.code === e.INVALID_STATE_ERR) {
timeout = setTimeout(function () {
element.currentTime = _currentTime;
_currentTime = NaN;
}, 400);
}
}
});
}
}
function stickTimeToBuffered(time) {
const buffered = getBufferRange();
let closestTime = time;
let closestDistance = 9999999999;
if (buffered) {
for (let i = 0; i < buffered.length; i++) {
const start = buffered.start(i);
const end = buffered.end(i);
const distanceToStart = Math.abs(start - time);
const distanceToEnd = Math.abs(end - time);
if (time >= start && time <= end) {
return time;
}
if (distanceToStart < closestDistance) {
closestDistance = distanceToStart;
closestTime = start;
}
if (distanceToEnd < closestDistance) {
closestDistance = distanceToEnd;
closestTime = end;
}
}
}
return closestTime;
}
function getElement() {
return element;
}
function setElement(value) {
//add check of value type
if (value === null || value === undefined || (value && (/^(VIDEO|AUDIO)$/i).test(value.nodeName))) {
element = value;
_registerResizeObserver(element);
} else {
throw VIDEO_MODEL_WRONG_ELEMENT_TYPE;
}
}
function _registerResizeObserver(element) {
try {
if (!resizeObserver || !element) {
return;
}
resizeObserver.observe(element);
} catch (e) {
}
}
function setSource(source) {
if (element) {
if (source) {
element.src = source;
} else {
element.removeAttribute('src');
element.load();
}
}
}
function setDisableRemotePlayback(value) {
if (element) {
element.disableRemotePlayback = value;
}
}
function getSource() {
return element ? element.src : null;
}
function getTTMLRenderingDiv() {
return TTMLRenderingDiv;
}
function getVttRenderingDiv() {
return vttRenderingDiv;
}
function setTTMLRenderingDiv(div) {
TTMLRenderingDiv = div;
// The styling will allow the captions to match the video window size and position.
TTMLRenderingDiv.style.position = 'absolute';
TTMLRenderingDiv.style.display = 'flex';
TTMLRenderingDiv.style.overflow = 'hidden';
TTMLRenderingDiv.style.pointerEvents = 'none';
TTMLRenderingDiv.style.top = 0;
TTMLRenderingDiv.style.left = 0;
}
function setVttRenderingDiv(div) {
vttRenderingDiv = div;
}
function setStallState(type, state) {
stallStream(type, state);
}
function isStalled() {
return (stalledStreams.length > 0);
}
function addStalledStream(type) {
Iif (type === null || !element || element.seeking || stalledStreams.indexOf(type) !== -1) {
return;
}
stalledStreams.push(type);
if (settings.get().streaming.buffer.syntheticStallEvents.enabled && element && stalledStreams.length === 1 && (settings.get().streaming.buffer.syntheticStallEvents.ignoreReadyState || getReadyState() >= Constants.VIDEO_ELEMENT_READY_STATES.HAVE_FUTURE_DATA)) {
// Halt playback until nothing is stalled
previousPlaybackRate = element.playbackRate;
setPlaybackRate(0, true);
const event = document.createEvent('Event');
event.initEvent('waiting', true, false);
element.dispatchEvent(event);
}
}
function removeStalledStream(type) {
let index = stalledStreams.indexOf(type);
Iif (type === null) {
return;
}
Iif (index !== -1) {
stalledStreams.splice(index, 1);
}
if (settings.get().streaming.buffer.syntheticStallEvents.enabled && element && !isStalled()) {
const resume = () => {
setPlaybackRate(previousPlaybackRate || 1, settings.get().streaming.buffer.syntheticStallEvents.ignoreReadyState);
if (!element.paused) {
const event = document.createEvent('Event');
event.initEvent('playing', true, false);
element.dispatchEvent(event);
}
}
if (settings.get().streaming.buffer.syntheticStallEvents.ignoreReadyState) {
resume();
} else {
Iif (resumeReadyStateFunction && resumeReadyStateFunction.func && resumeReadyStateFunction.event) {
removeEventListener(resumeReadyStateFunction.event, resumeReadyStateFunction.func);
}
resumeReadyStateFunction = waitForReadyState(Constants.VIDEO_ELEMENT_READY_STATES.HAVE_FUTURE_DATA, resume);
}
}
}
function stallStream(type, isStalled) {
if (isStalled) {
addStalledStream(type);
} else {
removeStalledStream(type);
}
}
//Calling play on the element will emit playing - even if the stream is stalled. If the stream is stalled, emit a waiting event.
function onPlaying() {
if (element && isStalled() && element.playbackRate === 0) {
const event = document.createEvent('Event');
event.initEvent('waiting', true, false);
element.dispatchEvent(event);
}
}
function getPlaybackQuality() {
if (!element) {
return null;
}
let hasWebKit = ('webkitDroppedFrameCount' in element) && ('webkitDecodedFrameCount' in element);
let hasQuality = ('getVideoPlaybackQuality' in element);
let result = null;
if (hasQuality) {
result = element.getVideoPlaybackQuality();
} else if (hasWebKit) {
result = {
droppedVideoFrames: element.webkitDroppedFrameCount,
totalVideoFrames: element.webkitDroppedFrameCount + element.webkitDecodedFrameCount,
creationTime: new Date()
};
}
return result;
}
function play() {
if (element) {
element.autoplay = true;
const p = element.play();
if (p && p.catch && typeof Promise !== 'undefined') {
p.catch((e) => {
if (e.name === 'NotAllowedError') {
eventBus.trigger(Events.PLAYBACK_NOT_ALLOWED);
}
logger.warn(`Caught pending play exception - continuing (${e})`);
});
}
}
}
function isPaused() {
return element ? element.paused : null;
}
function pause() {
if (element) {
element.pause();
element.autoplay = false;
}
}
function isSeeking() {
return element ? (element.seeking || !isNaN(_currentTime)) : null;
}
function getTime() {
return element ? (!isNaN(_currentTime) ? _currentTime : element.currentTime) : null;
}
function getPlaybackRate() {
return element ? element.playbackRate : null;
}
function getPlayedRanges() {
return element ? element.played : null;
}
function getEnded() {
return element ? element.ended : null;
}
function addEventListener(eventName, eventCallBack) {
if (element) {
element.addEventListener(eventName, eventCallBack);
}
}
function removeEventListener(eventName, eventCallBack) {
if (element) {
element.removeEventListener(eventName, eventCallBack);
}
}
function getReadyState() {
return element ? element.readyState : NaN;
}
function getBufferRange() {
return element ? element.buffered : null;
}
function getClientWidth() {
return element ? element.clientWidth : NaN;
}
function getClientHeight() {
return element ? element.clientHeight : NaN;
}
function getVideoWidth() {
return element ? element.videoWidth : NaN;
}
function getVideoHeight() {
return element ? element.videoHeight : NaN;
}
function getVideoRelativeOffsetTop() {
if (element) {
const parentElement = element.parentNode.host || element.parentNode;
return parentElement ? element.getBoundingClientRect().top - parentElement.getBoundingClientRect().top : NaN;
}
return NaN;
}
function getVideoRelativeOffsetLeft() {
if (element) {
const parentElement = element.parentNode.host || element.parentNode;
return parentElement ? element.getBoundingClientRect().left - parentElement.getBoundingClientRect().left : NaN;
}
return NaN;
}
function getTextTracks() {
return element ? element.textTracks : [];
}
function getTextTrack(kind, label, lang, isTTML, isEmbedded) {
if (element) {
for (let i = 0; i < element.textTracks.length; i++) {
//label parameter could be a number (due to adaptationSet), but label, the attribute of textTrack, is a string => to modify...
//label could also be undefined (due to adaptationSet)
if (element.textTracks[i].kind === kind && (label ? element.textTracks[i].label == label : true) &&
element.textTracks[i].language === lang && element.textTracks[i].isTTML === isTTML && element.textTracks[i].isEmbedded === isEmbedded) {
return element.textTracks[i];
}
}
}
return null;
}
function addTextTrack(kind, label, lang, isTTML, isEmbedded) {
if (!element) {
return null;
}
// check if track of same type has not been already created for previous stream
// then use it (no way to remove existing text track from video element)
let track = getTextTrack(kind, label, lang, isTTML, isEmbedded);
if (!track) {
track = element.addTextTrack(kind, label, lang);
track.isEmbedded = isEmbedded;
track.isTTML = isTTML;
}
return track;
}
function appendChild(childElement) {
if (element) {
element.appendChild(childElement);
//in Chrome, we need to differenciate textTrack with same lang, kind and label but different format (vtt, ttml, etc...)
if (childElement.isTTML !== undefined) {
element.textTracks[element.textTracks.length - 1].isTTML = childElement.isTTML;
element.textTracks[element.textTracks.length - 1].isEmbedded = childElement.isEmbedded;
}
}
}
function removeChild(childElement) {
if (element) {
element.removeChild(childElement);
}
}
function waitForReadyState(targetReadyState, callback) {
if (targetReadyState === Constants.VIDEO_ELEMENT_READY_STATES.HAVE_NOTHING ||
getReadyState() >= targetReadyState) {
callback();
return null;
} else E{
// wait for the appropriate callback before checking again
const event = READY_STATES_TO_EVENT_NAMES.get(targetReadyState);
return _listenOnce(event, callback);
}
}
function _listenOnce(event, callback) {
const func = () => {
// Stop listening to this event.
removeEventListener(event, func);
// Call the original listener.
callback(event);
};
addEventListener(event, func);
return { func, event }
}
function getVideoElementSize() {
const hasPixelRatio = settings.get().streaming.abr.usePixelRatioInLimitBitrateByPortal && window.hasOwnProperty('devicePixelRatio');
const pixelRatio = hasPixelRatio ? window.devicePixelRatio : 1;
const elementWidth = getClientWidth() * pixelRatio;
const elementHeight = getClientHeight() * pixelRatio;
return {
elementWidth,
elementHeight
}
}
instance = {
addEventListener,
addTextTrack,
appendChild,
getBufferRange,
getClientHeight,
getClientWidth,
getElement,
getEnded,
getPlaybackQuality,
getPlaybackRate,
getPlayedRanges,
getReadyState,
getSource,
getTTMLRenderingDiv,
getTextTrack,
getTextTracks,
getTime,
getVideoElementSize,
getVideoHeight,
getVideoRelativeOffsetLeft,
getVideoRelativeOffsetTop,
getVideoWidth,
getVttRenderingDiv,
initialize,
isPaused,
isSeeking,
isStalled,
pause,
play,
removeChild,
removeEventListener,
reset,
setConfig,
setCurrentTime,
setDisableRemotePlayback,
setElement,
setPlaybackRate,
setSource,
setStallState,
setTTMLRenderingDiv,
setVttRenderingDiv,
waitForReadyState,
};
setup();
return instance;
}
VideoModel.__dashjs_factory_name = 'VideoModel';
export default FactoryMaker.getSingletonFactory(VideoModel);
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