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Add MediaChunkIterator for HLS media playlists.

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This allows to iterate through the available segments of the playlist.

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Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=204100116
This commit is contained in:
tonihei 2018-07-11 03:48:55 -07:00 committed by Oliver Woodman
parent 39b812298d
commit 095c6e4bf8
1 changed files with 67 additions and 0 deletions
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67
library/hls/src/main/java/com/google/android/exoplayer2/source/hls/playlist/HlsMediaPlaylistSegmentIterator.java Normal file
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/*
* Copyright (C) 2018 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.exoplayer2.source.hls.playlist;
import android.net.Uri;
import com.google.android.exoplayer2.source.chunk.BaseMediaChunkIterator;
import com.google.android.exoplayer2.source.chunk.MediaChunkIterator;
import com.google.android.exoplayer2.upstream.DataSpec;
import com.google.android.exoplayer2.util.UriUtil;
/** {@link MediaChunkIterator} wrapping a {@link HlsMediaPlaylist}. */
public final class HlsMediaPlaylistSegmentIterator extends BaseMediaChunkIterator {
private final HlsMediaPlaylist playlist;
private final long startOfPlaylistInPeriodUs;
/**
* Creates iterator.
*
* @param playlist The {@link HlsMediaPlaylist} to wrap.
* @param startOfPlaylistInPeriodUs The start time of the playlist in the period, in microseconds.
* @param chunkIndex The chunk index in the playlist at which the iterator will start.
*/
public HlsMediaPlaylistSegmentIterator(
HlsMediaPlaylist playlist, long startOfPlaylistInPeriodUs, int chunkIndex) {
super(/* fromIndex= */ chunkIndex, /* toIndex= */ playlist.segments.size() - 1);
this.playlist = playlist;
this.startOfPlaylistInPeriodUs = startOfPlaylistInPeriodUs;
}
@Override
public DataSpec getDataSpec() {
checkInBounds();
HlsMediaPlaylist.Segment segment = playlist.segments.get((int) getCurrentIndex());
Uri chunkUri = UriUtil.resolveToUri(playlist.baseUri, segment.url);
return new DataSpec(
chunkUri, segment.byterangeOffset, segment.byterangeLength, /* key= */ null);
}
@Override
public long getChunkStartTimeUs() {
checkInBounds();
HlsMediaPlaylist.Segment segment = playlist.segments.get((int) getCurrentIndex());
return startOfPlaylistInPeriodUs + segment.relativeStartTimeUs;
}
@Override
public long getChunkEndTimeUs() {
checkInBounds();
HlsMediaPlaylist.Segment segment = playlist.segments.get((int) getCurrentIndex());
long segmentStartTimeInPeriodUs = startOfPlaylistInPeriodUs + segment.relativeStartTimeUs;
return segmentStartTimeInPeriodUs + segment.durationUs;
}
}