add-text-track-data.js
4.54 KB
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
/**
* @file add-text-track-data.js
*/
'use strict';
Object.defineProperty(exports, '__esModule', {
value: true
});
function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { 'default': obj }; }
var _globalWindow = require('global/window');
var _globalWindow2 = _interopRequireDefault(_globalWindow);
var _videoJs = require('video.js');
var _videoJs2 = _interopRequireDefault(_videoJs);
/**
* Define properties on a cue for backwards compatability,
* but warn the user that the way that they are using it
* is depricated and will be removed at a later date.
*
* @param {Cue} cue the cue to add the properties on
* @private
*/
var deprecateOldCue = function deprecateOldCue(cue) {
Object.defineProperties(cue.frame, {
id: {
get: function get() {
_videoJs2['default'].log.warn('cue.frame.id is deprecated. Use cue.value.key instead.');
return cue.value.key;
}
},
value: {
get: function get() {
_videoJs2['default'].log.warn('cue.frame.value is deprecated. Use cue.value.data instead.');
return cue.value.data;
}
},
privateData: {
get: function get() {
_videoJs2['default'].log.warn('cue.frame.privateData is deprecated. Use cue.value.data instead.');
return cue.value.data;
}
}
});
};
var durationOfVideo = function durationOfVideo(duration) {
var dur = undefined;
if (isNaN(duration) || Math.abs(duration) === Infinity) {
dur = Number.MAX_VALUE;
} else {
dur = duration;
}
return dur;
};
/**
* Add text track data to a source handler given the captions and
* metadata from the buffer.
*
* @param {Object} sourceHandler the flash or virtual source buffer
* @param {Array} captionArray an array of caption data
* @param {Array} metadataArray an array of meta data
* @private
*/
var addTextTrackData = function addTextTrackData(sourceHandler, captionArray, metadataArray) {
var Cue = _globalWindow2['default'].WebKitDataCue || _globalWindow2['default'].VTTCue;
if (captionArray) {
captionArray.forEach(function (caption) {
var track = caption.stream;
this.inbandTextTracks_[track].addCue(new Cue(caption.startTime + this.timestampOffset, caption.endTime + this.timestampOffset, caption.text));
}, sourceHandler);
}
if (metadataArray) {
(function () {
var videoDuration = durationOfVideo(sourceHandler.mediaSource_.duration);
metadataArray.forEach(function (metadata) {
var time = metadata.cueTime + this.timestampOffset;
metadata.frames.forEach(function (frame) {
var cue = new Cue(time, time, frame.value || frame.url || frame.data || '');
cue.frame = frame;
cue.value = frame;
deprecateOldCue(cue);
this.metadataTrack_.addCue(cue);
}, this);
}, sourceHandler);
// Updating the metadeta cues so that
// the endTime of each cue is the startTime of the next cue
// the endTime of last cue is the duration of the video
if (sourceHandler.metadataTrack_ && sourceHandler.metadataTrack_.cues && sourceHandler.metadataTrack_.cues.length) {
(function () {
var cues = sourceHandler.metadataTrack_.cues;
var cuesArray = [];
// Create a copy of the TextTrackCueList...
// ...disregarding cues with a falsey value
for (var i = 0; i < cues.length; i++) {
if (cues[i]) {
cuesArray.push(cues[i]);
}
}
// Group cues by their startTime value
var cuesGroupedByStartTime = cuesArray.reduce(function (obj, cue) {
var timeSlot = obj[cue.startTime] || [];
timeSlot.push(cue);
obj[cue.startTime] = timeSlot;
return obj;
}, {});
// Sort startTimes by ascending order
var sortedStartTimes = Object.keys(cuesGroupedByStartTime).sort(function (a, b) {
return Number(a) - Number(b);
});
// Map each cue group's endTime to the next group's startTime
sortedStartTimes.forEach(function (startTime, idx) {
var cueGroup = cuesGroupedByStartTime[startTime];
var nextTime = Number(sortedStartTimes[idx + 1]) || videoDuration;
// Map each cue's endTime the next group's startTime
cueGroup.forEach(function (cue) {
cue.endTime = nextTime;
});
});
})();
}
})();
}
};
exports['default'] = {
addTextTrackData: addTextTrackData,
durationOfVideo: durationOfVideo
};
module.exports = exports['default'];