/
SingleSampleChunkSource.java
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/
SingleSampleChunkSource.java
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/*
* Copyright (C) 2014 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 com.google.android.exoplayer.chunk;
import com.google.android.exoplayer.MediaFormat;
import com.google.android.exoplayer.TrackInfo;
import com.google.android.exoplayer.upstream.DataSource;
import com.google.android.exoplayer.upstream.DataSpec;
import java.io.IOException;
import java.util.List;
/**
* A chunk source that provides a single chunk containing a single sample.
* <p>
* An example use case for this implementation is to act as the source for loading out-of-band
* subtitles, where subtitles for the entire video are delivered as a single file.
*/
public class SingleSampleChunkSource implements ChunkSource {
private final DataSource dataSource;
private final DataSpec dataSpec;
private final Format format;
private final long durationUs;
private final MediaFormat mediaFormat;
private final TrackInfo trackInfo;
/**
* @param dataSource A {@link DataSource} suitable for loading the sample data.
* @param dataSpec Defines the location of the sample.
* @param format The format of the sample.
* @param durationUs The duration of the sample in microseconds.
* @param mediaFormat The sample media format. May be null.
*/
public SingleSampleChunkSource(DataSource dataSource, DataSpec dataSpec, Format format,
long durationUs, MediaFormat mediaFormat) {
this.dataSource = dataSource;
this.dataSpec = dataSpec;
this.format = format;
this.durationUs = durationUs;
this.mediaFormat = mediaFormat;
trackInfo = new TrackInfo(format.mimeType, durationUs);
}
@Override
public TrackInfo getTrackInfo() {
return trackInfo;
}
@Override
public void getMaxVideoDimensions(MediaFormat out) {
// Do nothing.
}
@Override
public void enable() {
// Do nothing.
}
@Override
public void continueBuffering(long playbackPositionUs) {
// Do nothing.
}
@Override
public void getChunkOperation(List<? extends MediaChunk> queue, long seekPositionUs,
long playbackPositionUs, ChunkOperationHolder out) {
if (!queue.isEmpty()) {
// We've already provided the single sample.
return;
}
out.chunk = initChunk();
}
@Override
public void disable(List<? extends MediaChunk> queue) {
// Do nothing.
}
@Override
public IOException getError() {
return null;
}
@Override
public void onChunkLoadError(Chunk chunk, Exception e) {
// Do nothing.
}
private SingleSampleMediaChunk initChunk() {
return new SingleSampleMediaChunk(dataSource, dataSpec, format, 0, 0, durationUs, -1,
mediaFormat);
}
}