This repository has been archived by the owner on Jan 16, 2023. It is now read-only.
forked from Dash-Industry-Forum/dash.js
/
TimelineConverter.js
284 lines (232 loc) · 11.8 KB
/
TimelineConverter.js
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
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
/**
* 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 EventBus from '../../core/EventBus';
import Events from '../../core/events/Events';
import FactoryMaker from '../../core/FactoryMaker';
import DashConstants from '../constants/DashConstants';
import DashManifestModel from '../models/DashManifestModel';
function TimelineConverter() {
const context = this.context;
const eventBus = EventBus(context).getInstance();
let instance,
dashManifestModel,
clientServerTimeShift,
isClientServerTimeSyncCompleted,
expectedLiveEdge;
function setup() {
dashManifestModel = DashManifestModel(context).getInstance();
reset();
}
function initialize() {
resetInitialSettings();
eventBus.on(Events.TIME_SYNCHRONIZATION_COMPLETED, onTimeSyncComplete, this);
}
function isTimeSyncCompleted() {
return isClientServerTimeSyncCompleted;
}
function setTimeSyncCompleted(value) {
isClientServerTimeSyncCompleted = value;
}
function getClientTimeOffset() {
return clientServerTimeShift;
}
function setClientTimeOffset(value) {
clientServerTimeShift = value;
}
function getExpectedLiveEdge() {
return expectedLiveEdge;
}
function setExpectedLiveEdge(value) {
expectedLiveEdge = value;
}
function calcAvailabilityTimeFromPresentationTime(presentationTime, mpd, isDynamic, calculateEnd) {
let availabilityTime = NaN;
if (calculateEnd) {
//@timeShiftBufferDepth specifies the duration of the time shifting buffer that is guaranteed
// to be available for a Media Presentation with type 'dynamic'.
// When not present, the value is infinite.
if (isDynamic && (mpd.timeShiftBufferDepth != Number.POSITIVE_INFINITY)) {
availabilityTime = new Date(mpd.availabilityStartTime.getTime() + ((presentationTime + mpd.timeShiftBufferDepth) * 1000));
} else {
availabilityTime = mpd.availabilityEndTime;
}
} else {
if (isDynamic) {
availabilityTime = new Date(mpd.availabilityStartTime.getTime() + (presentationTime - clientServerTimeShift) * 1000);
} else {
// in static mpd, all segments are available at the same time
availabilityTime = mpd.availabilityStartTime;
}
}
return availabilityTime;
}
function calcAvailabilityStartTimeFromPresentationTime(presentationTime, mpd, isDynamic) {
return calcAvailabilityTimeFromPresentationTime.call(this, presentationTime, mpd, isDynamic);
}
function calcAvailabilityEndTimeFromPresentationTime(presentationTime, mpd, isDynamic) {
return calcAvailabilityTimeFromPresentationTime.call(this, presentationTime, mpd, isDynamic, true);
}
function calcPresentationTimeFromWallTime(wallTime, period) {
return ((wallTime.getTime() - period.mpd.availabilityStartTime.getTime() + clientServerTimeShift * 1000) / 1000);
}
function calcPresentationTimeFromMediaTime(mediaTime, representation) {
const periodStart = representation.adaptation.period.start;
const presentationOffset = representation.presentationTimeOffset;
return mediaTime + (periodStart - presentationOffset);
}
function calcMediaTimeFromPresentationTime(presentationTime, representation) {
const periodStart = representation.adaptation.period.start;
const presentationOffset = representation.presentationTimeOffset;
return presentationTime - periodStart + presentationOffset;
}
function calcWallTimeForSegment(segment, isDynamic) {
let suggestedPresentationDelay,
displayStartTime,
wallTime;
if (isDynamic) {
suggestedPresentationDelay = segment.representation.adaptation.period.mpd.suggestedPresentationDelay;
displayStartTime = segment.presentationStartTime + suggestedPresentationDelay;
wallTime = new Date(segment.availabilityStartTime.getTime() + (displayStartTime * 1000));
}
return wallTime;
}
function calcSegmentAvailabilityRange(voRepresentation, isDynamic) {
// Static Range Finder
const voPeriod = voRepresentation.adaptation.period;
const range = { start: voPeriod.start, end: voPeriod.start + voPeriod.duration };
if (!isDynamic) return range;
if (!isClientServerTimeSyncCompleted && voRepresentation.segmentAvailabilityRange) {
return voRepresentation.segmentAvailabilityRange;
}
// Dynamic Range Finder
const d = voRepresentation.segmentDuration || (voRepresentation.segments && voRepresentation.segments.length ? voRepresentation.segments[voRepresentation.segments.length - 1].duration : 0);
// Specific use case of SegmentTimeline without timeShiftBufferDepth
if (voRepresentation.segmentInfoType === DashConstants.SEGMENT_TIMELINE && voPeriod.mpd.timeShiftBufferDepth === Number.POSITIVE_INFINITY) {
return calcSegmentAvailabilityRangeFromTimeline(voRepresentation);
}
const now = calcPresentationTimeFromWallTime(new Date(), voPeriod);
const periodEnd = voPeriod.start + voPeriod.duration;
range.start = Math.max((now - voPeriod.mpd.timeShiftBufferDepth), voPeriod.start);
const endOffset = voRepresentation.availabilityTimeOffset !== undefined &&
voRepresentation.availabilityTimeOffset < d ? d - voRepresentation.availabilityTimeOffset : d;
range.end = now >= periodEnd && now - endOffset < periodEnd ? periodEnd : now - endOffset;
return range;
}
function calcSegmentAvailabilityRangeFromTimeline(voRepresentation) {
const adaptation = voRepresentation.adaptation.period.mpd.manifest.Period_asArray[voRepresentation.adaptation.period.index].AdaptationSet_asArray[voRepresentation.adaptation.index];
const representation = dashManifestModel.getRepresentationFor(voRepresentation.index, adaptation);
const timeline = representation.SegmentTemplate.SegmentTimeline;
const timescale = representation.SegmentTemplate.timescale;
const segments = timeline.S_asArray;
const range = { start: 0, end: 0 };
let d = 0;
let segment,
repeat,
i,
len;
range.start = segments[0].t / timescale;
for (i = 0, len = segments.length; i < len; i++) {
segment = segments[i];
repeat = 0;
if (segment.hasOwnProperty('r')) {
repeat = segment.r;
}
d += (segment.d / timescale) * (1 + repeat);
}
range.end = range.start + d;
return range;
}
function getPeriodEnd(voRepresentation, isDynamic) {
// Static Range Finder
const voPeriod = voRepresentation.adaptation.period;
if (!isDynamic) {
return voPeriod.start + voPeriod.duration;
}
if (!isClientServerTimeSyncCompleted && voRepresentation.segmentAvailabilityRange) {
return voRepresentation.segmentAvailabilityRange;
}
// Dynamic Range Finder
const d = voRepresentation.segmentDuration || (voRepresentation.segments && voRepresentation.segments.length ? voRepresentation.segments[voRepresentation.segments.length - 1].duration : 0);
const now = calcPresentationTimeFromWallTime(new Date(), voPeriod);
const periodEnd = voPeriod.start + voPeriod.duration;
const endOffset = voRepresentation.availabilityTimeOffset !== undefined &&
voRepresentation.availabilityTimeOffset < d ? d - voRepresentation.availabilityTimeOffset : d;
return Math.min(now - endOffset, periodEnd);
}
function calcPeriodRelativeTimeFromMpdRelativeTime(representation, mpdRelativeTime) {
const periodStartTime = representation.adaptation.period.start;
return mpdRelativeTime - periodStartTime;
}
/*
* We need to figure out if we want to timesync for segmentTimeine where useCalculatedLiveEdge = true
* seems we figure out client offset based on logic in liveEdgeFinder getLiveEdge timelineConverter.setClientTimeOffset(liveEdge - representationInfo.DVRWindow.end);
* FYI StreamController's onManifestUpdated entry point to timeSync
* */
function onTimeSyncComplete(e) {
if (isClientServerTimeSyncCompleted) return;
if (e.offset !== undefined) {
setClientTimeOffset(e.offset / 1000);
isClientServerTimeSyncCompleted = true;
}
}
function resetInitialSettings() {
clientServerTimeShift = 0;
isClientServerTimeSyncCompleted = false;
expectedLiveEdge = NaN;
}
function reset() {
eventBus.off(Events.TIME_SYNCHRONIZATION_COMPLETED, onTimeSyncComplete, this);
resetInitialSettings();
}
instance = {
initialize: initialize,
isTimeSyncCompleted: isTimeSyncCompleted,
setTimeSyncCompleted: setTimeSyncCompleted,
getClientTimeOffset: getClientTimeOffset,
setClientTimeOffset: setClientTimeOffset,
getExpectedLiveEdge: getExpectedLiveEdge,
setExpectedLiveEdge: setExpectedLiveEdge,
calcAvailabilityStartTimeFromPresentationTime: calcAvailabilityStartTimeFromPresentationTime,
calcAvailabilityEndTimeFromPresentationTime: calcAvailabilityEndTimeFromPresentationTime,
calcPresentationTimeFromWallTime: calcPresentationTimeFromWallTime,
calcPresentationTimeFromMediaTime: calcPresentationTimeFromMediaTime,
calcPeriodRelativeTimeFromMpdRelativeTime: calcPeriodRelativeTimeFromMpdRelativeTime,
calcMediaTimeFromPresentationTime: calcMediaTimeFromPresentationTime,
calcSegmentAvailabilityRange: calcSegmentAvailabilityRange,
getPeriodEnd: getPeriodEnd,
calcWallTimeForSegment: calcWallTimeForSegment,
reset: reset
};
setup();
return instance;
}
TimelineConverter.__dashjs_factory_name = 'TimelineConverter';
export default FactoryMaker.getSingletonFactory(TimelineConverter);