DashWrappingSegmentIndex.java
/*
* 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 androidx.media3.exoplayer.dash;
import androidx.media3.common.C;
import androidx.media3.common.util.UnstableApi;
import androidx.media3.exoplayer.dash.manifest.RangedUri;
import androidx.media3.extractor.ChunkIndex;
/**
* An implementation of {@link DashSegmentIndex} that wraps a {@link ChunkIndex} parsed from a media
* stream.
*/
@UnstableApi
public final class DashWrappingSegmentIndex implements DashSegmentIndex {
private final ChunkIndex chunkIndex;
private final long timeOffsetUs;
/**
* @param chunkIndex The {@link ChunkIndex} to wrap.
* @param timeOffsetUs An offset to subtract from the times in the wrapped index, in microseconds.
*/
public DashWrappingSegmentIndex(ChunkIndex chunkIndex, long timeOffsetUs) {
this.chunkIndex = chunkIndex;
this.timeOffsetUs = timeOffsetUs;
}
@Override
public long getFirstSegmentNum() {
return 0;
}
@Override
public long getFirstAvailableSegmentNum(long periodDurationUs, long nowUnixTimeUs) {
return 0;
}
@Override
public long getSegmentCount(long periodDurationUs) {
return chunkIndex.length;
}
@Override
public long getAvailableSegmentCount(long periodDurationUs, long nowUnixTimeUs) {
return chunkIndex.length;
}
@Override
public long getNextSegmentAvailableTimeUs(long periodDurationUs, long nowUnixTimeUs) {
return C.TIME_UNSET;
}
@Override
public long getTimeUs(long segmentNum) {
return chunkIndex.timesUs[(int) segmentNum] - timeOffsetUs;
}
@Override
public long getDurationUs(long segmentNum, long periodDurationUs) {
return chunkIndex.durationsUs[(int) segmentNum];
}
@Override
public RangedUri getSegmentUrl(long segmentNum) {
return new RangedUri(
null, chunkIndex.offsets[(int) segmentNum], chunkIndex.sizes[(int) segmentNum]);
}
@Override
public long getSegmentNum(long timeUs, long periodDurationUs) {
return chunkIndex.getChunkIndex(timeUs + timeOffsetUs);
}
@Override
public boolean isExplicit() {
return true;
}
}