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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 Constants from '../constants/Constants.js';
import DashConstants from '../../dash/constants/DashConstants.js';
import FactoryMaker from '../../core/FactoryMaker.js';
import ThumbnailTrackInfo from '../vo/ThumbnailTrackInfo.js';
import URLUtils from '../../streaming/utils/URLUtils.js';
import {getTimeBasedSegment, processUriTemplate} from '../../dash/utils/SegmentsUtils.js';
import BoxParser from '../../streaming/utils/BoxParser.js';
import XHRLoader from '../../streaming/net/XHRLoader.js';
import DashHandler from '../../dash/DashHandler.js';
import SegmentsController from '../../dash/controllers/SegmentsController.js';
import CommonMediaRequest from '../vo/CommonMediaRequest.js';
import CommonMediaResponse from '../vo/CommonMediaResponse.js';
function ThumbnailTracks(config) {
const context = this.context;
const adapter = config.adapter;
const baseURLController = config.baseURLController;
const streamInfo = config.streamInfo;
const timelineConverter = config.timelineConverter;
const debug = config.debug;
const eventBus = config.eventBus;
const events = config.events;
const dashConstants = config.dashConstants;
const urlUtils = URLUtils(context).getInstance();
let instance,
tracks,
representations,
dashHandler,
currentTrackIndex,
mediaInfo,
segmentsController,
loader,
boxParser;
function setup() {
reset();
loader = XHRLoader(context).create({});
boxParser = BoxParser(context).getInstance();
segmentsController = SegmentsController(context).create({
events,
eventBus,
streamInfo,
timelineConverter,
dashConstants,
dashMetrics: config.dashMetrics,
segmentBaseController: config.segmentBaseController,
type: Constants.IMAGE
});
dashHandler = DashHandler(context).create({
streamInfo,
type: Constants.IMAGE,
timelineConverter,
segmentsController,
baseURLController,
debug,
eventBus,
events,
dashConstants,
urlUtils
});
// initialize controllers
dashHandler.initialize(adapter ? adapter.getIsDynamic() : false);
}
function addTracks() {
Iif (!streamInfo || !adapter) {
return;
}
// Extract thumbnail tracks
mediaInfo = adapter.getMediaInfoForType(streamInfo, Constants.IMAGE);
Iif (!mediaInfo) {
return;
}
const voReps = adapter.getVoRepresentations(mediaInfo);
if (voReps && voReps.length > 0) {
voReps.forEach((rep) => {
if ((rep.segmentInfoType === DashConstants.SEGMENT_TEMPLATE && rep.segmentDuration > 0 && rep.media) ||
rep.segmentInfoType === DashConstants.SEGMENT_TIMELINE) {
_createTrack(rep);
}
Iif (rep.segmentInfoType === DashConstants.SEGMENT_BASE) {
_createTrack(rep, true);
}
representations.push(rep);
});
}
if (tracks.length > 0) {
// Sort bitrates and select the lowest bitrate rendition
tracks.sort((a, b) => a.bitrate - b.bitrate);
}
}
function _createTrack(representation, useSegmentBase) {
const track = new ThumbnailTrackInfo();
track.id = representation.id;
track.bitrate = representation.bandwidth;
track.width = representation.width;
track.height = representation.height;
track.tilesHor = 1;
track.tilesVert = 1;
if (representation.essentialProperties) {
representation.essentialProperties.forEach((p) => {
if (Constants.THUMBNAILS_SCHEME_ID_URIS.indexOf(p.schemeIdUri) >= 0 && p.value) {
const vars = p.value.split('x');
if (vars.length === 2 && !isNaN(vars[0]) && !isNaN(vars[1])) {
track.tilesHor = parseInt(vars[0], 10);
track.tilesVert = parseInt(vars[1], 10);
}
}
});
}
Iif (useSegmentBase) {
segmentsController.updateSegmentData(representation)
.then((data) => {
_handleUpdatedSegmentData(track, representation, data);
});
} else {
track.startNumber = representation.startNumber;
track.segmentDuration = representation.segmentDuration;
track.timescale = representation.timescale;
track.templateUrl = buildTemplateUrl(representation);
}
if (track.tilesHor > 0 && track.tilesVert > 0) {
// Precalculate width and heigth per tile for perf reasons
track.widthPerTile = track.width / track.tilesHor;
track.heightPerTile = track.height / track.tilesVert;
tracks.push(track);
}
}
function _handleUpdatedSegmentData(track, representation, data) {
let cache = [];
const segments = _normalizeSegments(data, representation);
representation.segments = segments;
representation.fragmentDuration = representation.segmentDuration || (representation.segments && representation.segments.length > 0 ? representation.segments[0].duration : NaN);
track.segmentDuration = representation.segments[0].duration; //assume all segments have the same duration
track.readThumbnail = function (time, callback) {
let cached = null;
cache.some(el => {
if (el.start <= time && el.end > time) {
cached = el.url;
return true;
}
});
if (cached) {
callback(cached);
} else {
representation.segments.some((ss) => {
if (ss.mediaStartTime <= time && ss.mediaStartTime + ss.duration > time) {
const baseURL = baseURLController.resolve(representation.path);
const commonMediaRequest = new CommonMediaRequest({
method: 'get',
url: baseURL.url,
responseType: 'arraybuffer',
customData: {
request: {
range: ss.mediaRange,
},
onloadend: function (e) {
let info = boxParser.getSamplesInfo(e.target.response);
let blob = new Blob([e.target.response.slice(info.sampleList[0].offset, info.sampleList[0].offset + info.sampleList[0].size)], { type: 'image/jpeg' });
let imageUrl = window.URL.createObjectURL(blob);
cache.push({
start: ss.mediaStartTime,
end: ss.mediaStartTime + ss.duration,
url: imageUrl
});
if (callback) {
callback(imageUrl);
}
}
},
})
const commonMediaResponse = new CommonMediaResponse({ request: commonMediaRequest });
loader.load(commonMediaRequest, commonMediaResponse);
return true;
}
});
}
};
}
function _normalizeSegments(data, representation) {
const segments = [];
let count = 0;
let i,
len,
s,
seg;
for (i = 0, len = data.segments.length; i < len; i++) {
s = data.segments[i];
seg = getTimeBasedSegment({
durationInTimescale: s.duration,
fTimescale: s.timescale,
index: count,
isDynamic: adapter.getIsDynamic(),
mediaRange: s.mediaRange,
mediaTime: s.startTime,
mediaUrl: s.media,
representation,
timelineConverter,
});
if (seg) {
segments.push(seg);
seg = null;
count++;
}
}
return segments;
}
function buildTemplateUrl(representation) {
const templateUrl = urlUtils.isRelative(representation.media) ?
urlUtils.resolve(representation.media, baseURLController.resolve(representation.path).url) : representation.media;
Iif (!templateUrl) {
return '';
}
return processUriTemplate(templateUrl, representation.id);
}
function getTracks() {
return tracks;
}
function getCurrentTrackIndex() {
return currentTrackIndex;
}
function getCurrentTrack() {
if (currentTrackIndex < 0) {
return null;
}
return tracks[currentTrackIndex];
}
function setTrackByIndex(index) {
if (!tracks || tracks.length === 0) {
return;
}
// select highest bitrate in case selected index is higher than bitrate list length
if (index >= tracks.length) {
index = tracks.length - 1;
}
currentTrackIndex = index;
}
function setTrackById(id) {
if (!tracks || tracks.length === 0) {
return;
}
const index = tracks.findIndex((elem) => {
return elem.id === id
})
if (index !== -1) {
currentTrackIndex = index;
}
}
function getThumbnailRequestForTime(time) {
let currentVoRep;
const voReps = adapter.getVoRepresentations(mediaInfo);
for (let i = 0; i < voReps.length; i++) {
if (tracks[currentTrackIndex].id === voReps[i].id) {
currentVoRep = voReps[i];
break;
}
}
return dashHandler.getSegmentRequestForTime(mediaInfo, currentVoRep, time);
}
function getRepresentations() {
return representations
}
function reset() {
tracks = [];
representations = [];
currentTrackIndex = -1;
mediaInfo = null;
if (dashHandler) {
dashHandler.reset();
dashHandler = null;
}
}
instance = {
addTracks,
getCurrentTrack,
getCurrentTrackIndex,
getRepresentations,
getThumbnailRequestForTime,
getTracks,
reset,
setTrackById,
setTrackByIndex,
};
setup();
return instance;
}
ThumbnailTracks.__dashjs_factory_name = 'ThumbnailTracks';
export default FactoryMaker.getClassFactory(ThumbnailTracks);
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