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
|
/*
* Copyright (C) 2016 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.mozilla.thirdparty.com.google.android.exoplayer2.text.webvtt;
import android.text.SpannableStringBuilder;
import org.mozilla.thirdparty.com.google.android.exoplayer2.C;
import org.mozilla.thirdparty.com.google.android.exoplayer2.text.Cue;
import org.mozilla.thirdparty.com.google.android.exoplayer2.text.Subtitle;
import org.mozilla.thirdparty.com.google.android.exoplayer2.util.Assertions;
import org.mozilla.thirdparty.com.google.android.exoplayer2.util.Util;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
/**
* A representation of a WebVTT subtitle.
*/
/* package */ final class WebvttSubtitle implements Subtitle {
private final List<WebvttCue> cues;
private final int numCues;
private final long[] cueTimesUs;
private final long[] sortedCueTimesUs;
/**
* @param cues A list of the cues in this subtitle.
*/
public WebvttSubtitle(List<WebvttCue> cues) {
this.cues = cues;
numCues = cues.size();
cueTimesUs = new long[2 * numCues];
for (int cueIndex = 0; cueIndex < numCues; cueIndex++) {
WebvttCue cue = cues.get(cueIndex);
int arrayIndex = cueIndex * 2;
cueTimesUs[arrayIndex] = cue.startTime;
cueTimesUs[arrayIndex + 1] = cue.endTime;
}
sortedCueTimesUs = Arrays.copyOf(cueTimesUs, cueTimesUs.length);
Arrays.sort(sortedCueTimesUs);
}
@Override
public int getNextEventTimeIndex(long timeUs) {
int index = Util.binarySearchCeil(sortedCueTimesUs, timeUs, false, false);
return index < sortedCueTimesUs.length ? index : C.INDEX_UNSET;
}
@Override
public int getEventTimeCount() {
return sortedCueTimesUs.length;
}
@Override
public long getEventTime(int index) {
Assertions.checkArgument(index >= 0);
Assertions.checkArgument(index < sortedCueTimesUs.length);
return sortedCueTimesUs[index];
}
@Override
public List<Cue> getCues(long timeUs) {
List<Cue> list = new ArrayList<>();
WebvttCue firstNormalCue = null;
SpannableStringBuilder normalCueTextBuilder = null;
for (int i = 0; i < numCues; i++) {
if ((cueTimesUs[i * 2] <= timeUs) && (timeUs < cueTimesUs[i * 2 + 1])) {
WebvttCue cue = cues.get(i);
// TODO(ibaker): Replace this with a closer implementation of the WebVTT spec (keeping
// individual cues, but tweaking their `line` value):
// https://www.w3.org/TR/webvtt1/#cue-computed-line
if (cue.isNormalCue()) {
// we want to merge all of the normal cues into a single cue to ensure they are drawn
// correctly (i.e. don't overlap) and to emulate roll-up, but only if there are multiple
// normal cues, otherwise we can just append the single normal cue
if (firstNormalCue == null) {
firstNormalCue = cue;
} else if (normalCueTextBuilder == null) {
normalCueTextBuilder = new SpannableStringBuilder();
normalCueTextBuilder
.append(Assertions.checkNotNull(firstNormalCue.text))
.append("\n")
.append(Assertions.checkNotNull(cue.text));
} else {
normalCueTextBuilder.append("\n").append(Assertions.checkNotNull(cue.text));
}
} else {
list.add(cue);
}
}
}
if (normalCueTextBuilder != null) {
// there were multiple normal cues, so create a new cue with all of the text
list.add(new WebvttCue.Builder().setText(normalCueTextBuilder).build());
} else if (firstNormalCue != null) {
// there was only a single normal cue, so just add it to the list
list.add(firstNormalCue);
}
return list;
}
}
|
