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
|
/*
* 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.source;
import androidx.annotation.IntDef;
import androidx.annotation.Nullable;
import org.mozilla.thirdparty.com.google.android.exoplayer2.Timeline;
import org.mozilla.thirdparty.com.google.android.exoplayer2.upstream.Allocator;
import org.mozilla.thirdparty.com.google.android.exoplayer2.upstream.TransferListener;
import java.io.IOException;
import java.lang.annotation.Documented;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
/**
* Merges multiple {@link MediaSource}s.
*
* <p>The {@link Timeline}s of the sources being merged must have the same number of periods.
*/
public final class MergingMediaSource extends CompositeMediaSource<Integer> {
/**
* Thrown when a {@link MergingMediaSource} cannot merge its sources.
*/
public static final class IllegalMergeException extends IOException {
/** The reason the merge failed. One of {@link #REASON_PERIOD_COUNT_MISMATCH}. */
@Documented
@Retention(RetentionPolicy.SOURCE)
@IntDef({REASON_PERIOD_COUNT_MISMATCH})
public @interface Reason {}
/**
* The sources have different period counts.
*/
public static final int REASON_PERIOD_COUNT_MISMATCH = 0;
/**
* The reason the merge failed.
*/
@Reason public final int reason;
/**
* @param reason The reason the merge failed.
*/
public IllegalMergeException(@Reason int reason) {
this.reason = reason;
}
}
private static final int PERIOD_COUNT_UNSET = -1;
private final MediaSource[] mediaSources;
private final Timeline[] timelines;
private final ArrayList<MediaSource> pendingTimelineSources;
private final CompositeSequenceableLoaderFactory compositeSequenceableLoaderFactory;
private int periodCount;
@Nullable private IllegalMergeException mergeError;
/**
* @param mediaSources The {@link MediaSource}s to merge.
*/
public MergingMediaSource(MediaSource... mediaSources) {
this(new DefaultCompositeSequenceableLoaderFactory(), mediaSources);
}
/**
* @param compositeSequenceableLoaderFactory A factory to create composite
* {@link SequenceableLoader}s for when this media source loads data from multiple streams
* (video, audio etc...).
* @param mediaSources The {@link MediaSource}s to merge.
*/
public MergingMediaSource(CompositeSequenceableLoaderFactory compositeSequenceableLoaderFactory,
MediaSource... mediaSources) {
this.mediaSources = mediaSources;
this.compositeSequenceableLoaderFactory = compositeSequenceableLoaderFactory;
pendingTimelineSources = new ArrayList<>(Arrays.asList(mediaSources));
periodCount = PERIOD_COUNT_UNSET;
timelines = new Timeline[mediaSources.length];
}
@Override
@Nullable
public Object getTag() {
return mediaSources.length > 0 ? mediaSources[0].getTag() : null;
}
@Override
protected void prepareSourceInternal(@Nullable TransferListener mediaTransferListener) {
super.prepareSourceInternal(mediaTransferListener);
for (int i = 0; i < mediaSources.length; i++) {
prepareChildSource(i, mediaSources[i]);
}
}
@Override
public void maybeThrowSourceInfoRefreshError() throws IOException {
if (mergeError != null) {
throw mergeError;
}
super.maybeThrowSourceInfoRefreshError();
}
@Override
public MediaPeriod createPeriod(MediaPeriodId id, Allocator allocator, long startPositionUs) {
MediaPeriod[] periods = new MediaPeriod[mediaSources.length];
int periodIndex = timelines[0].getIndexOfPeriod(id.periodUid);
for (int i = 0; i < periods.length; i++) {
MediaPeriodId childMediaPeriodId =
id.copyWithPeriodUid(timelines[i].getUidOfPeriod(periodIndex));
periods[i] = mediaSources[i].createPeriod(childMediaPeriodId, allocator, startPositionUs);
}
return new MergingMediaPeriod(compositeSequenceableLoaderFactory, periods);
}
@Override
public void releasePeriod(MediaPeriod mediaPeriod) {
MergingMediaPeriod mergingPeriod = (MergingMediaPeriod) mediaPeriod;
for (int i = 0; i < mediaSources.length; i++) {
mediaSources[i].releasePeriod(mergingPeriod.periods[i]);
}
}
@Override
protected void releaseSourceInternal() {
super.releaseSourceInternal();
Arrays.fill(timelines, null);
periodCount = PERIOD_COUNT_UNSET;
mergeError = null;
pendingTimelineSources.clear();
Collections.addAll(pendingTimelineSources, mediaSources);
}
@Override
protected void onChildSourceInfoRefreshed(
Integer id, MediaSource mediaSource, Timeline timeline) {
if (mergeError == null) {
mergeError = checkTimelineMerges(timeline);
}
if (mergeError != null) {
return;
}
pendingTimelineSources.remove(mediaSource);
timelines[id] = timeline;
if (pendingTimelineSources.isEmpty()) {
refreshSourceInfo(timelines[0]);
}
}
@Override
@Nullable
protected MediaPeriodId getMediaPeriodIdForChildMediaPeriodId(
Integer id, MediaPeriodId mediaPeriodId) {
return id == 0 ? mediaPeriodId : null;
}
@Nullable
private IllegalMergeException checkTimelineMerges(Timeline timeline) {
if (periodCount == PERIOD_COUNT_UNSET) {
periodCount = timeline.getPeriodCount();
} else if (timeline.getPeriodCount() != periodCount) {
return new IllegalMergeException(IllegalMergeException.REASON_PERIOD_COUNT_MISMATCH);
}
return null;
}
}
|
