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/*
* 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 org.mozilla.thirdparty.com.google.android.exoplayer2.C;
/**
* A {@link SequenceableLoader} that encapsulates multiple other {@link SequenceableLoader}s.
*/
public class CompositeSequenceableLoader implements SequenceableLoader {
protected final SequenceableLoader[] loaders;
public CompositeSequenceableLoader(SequenceableLoader[] loaders) {
this.loaders = loaders;
}
@Override
public final long getBufferedPositionUs() {
long bufferedPositionUs = Long.MAX_VALUE;
for (SequenceableLoader loader : loaders) {
long loaderBufferedPositionUs = loader.getBufferedPositionUs();
if (loaderBufferedPositionUs != C.TIME_END_OF_SOURCE) {
bufferedPositionUs = Math.min(bufferedPositionUs, loaderBufferedPositionUs);
}
}
return bufferedPositionUs == Long.MAX_VALUE ? C.TIME_END_OF_SOURCE : bufferedPositionUs;
}
@Override
public final long getNextLoadPositionUs() {
long nextLoadPositionUs = Long.MAX_VALUE;
for (SequenceableLoader loader : loaders) {
long loaderNextLoadPositionUs = loader.getNextLoadPositionUs();
if (loaderNextLoadPositionUs != C.TIME_END_OF_SOURCE) {
nextLoadPositionUs = Math.min(nextLoadPositionUs, loaderNextLoadPositionUs);
}
}
return nextLoadPositionUs == Long.MAX_VALUE ? C.TIME_END_OF_SOURCE : nextLoadPositionUs;
}
@Override
public final void reevaluateBuffer(long positionUs) {
for (SequenceableLoader loader : loaders) {
loader.reevaluateBuffer(positionUs);
}
}
@Override
public boolean continueLoading(long positionUs) {
boolean madeProgress = false;
boolean madeProgressThisIteration;
do {
madeProgressThisIteration = false;
long nextLoadPositionUs = getNextLoadPositionUs();
if (nextLoadPositionUs == C.TIME_END_OF_SOURCE) {
break;
}
for (SequenceableLoader loader : loaders) {
long loaderNextLoadPositionUs = loader.getNextLoadPositionUs();
boolean isLoaderBehind =
loaderNextLoadPositionUs != C.TIME_END_OF_SOURCE
&& loaderNextLoadPositionUs <= positionUs;
if (loaderNextLoadPositionUs == nextLoadPositionUs || isLoaderBehind) {
madeProgressThisIteration |= loader.continueLoading(positionUs);
}
}
madeProgress |= madeProgressThisIteration;
} while (madeProgressThisIteration);
return madeProgress;
}
@Override
public boolean isLoading() {
for (SequenceableLoader loader : loaders) {
if (loader.isLoading()) {
return true;
}
}
return false;
}
}
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