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/*
* Copyright (C) 2017 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.hls.offline;
import android.net.Uri;
import org.mozilla.thirdparty.com.google.android.exoplayer2.C;
import org.mozilla.thirdparty.com.google.android.exoplayer2.offline.DownloaderConstructorHelper;
import org.mozilla.thirdparty.com.google.android.exoplayer2.offline.SegmentDownloader;
import org.mozilla.thirdparty.com.google.android.exoplayer2.offline.StreamKey;
import org.mozilla.thirdparty.com.google.android.exoplayer2.source.hls.playlist.HlsMasterPlaylist;
import org.mozilla.thirdparty.com.google.android.exoplayer2.source.hls.playlist.HlsMediaPlaylist;
import org.mozilla.thirdparty.com.google.android.exoplayer2.source.hls.playlist.HlsPlaylist;
import org.mozilla.thirdparty.com.google.android.exoplayer2.source.hls.playlist.HlsPlaylistParser;
import org.mozilla.thirdparty.com.google.android.exoplayer2.upstream.DataSource;
import org.mozilla.thirdparty.com.google.android.exoplayer2.upstream.DataSpec;
import org.mozilla.thirdparty.com.google.android.exoplayer2.upstream.ParsingLoadable;
import org.mozilla.thirdparty.com.google.android.exoplayer2.util.UriUtil;
import java.io.IOException;
import java.util.ArrayList;
import java.util.HashSet;
import java.util.List;
/**
* A downloader for HLS streams.
*
* <p>Example usage:
*
* <pre>{@code
* SimpleCache cache = new SimpleCache(downloadFolder, new NoOpCacheEvictor(), databaseProvider);
* DefaultHttpDataSourceFactory factory = new DefaultHttpDataSourceFactory("ExoPlayer", null);
* DownloaderConstructorHelper constructorHelper =
* new DownloaderConstructorHelper(cache, factory);
* // Create a downloader for the first variant in a master playlist.
* HlsDownloader hlsDownloader =
* new HlsDownloader(
* playlistUri,
* Collections.singletonList(new StreamKey(HlsMasterPlaylist.GROUP_INDEX_VARIANT, 0)),
* constructorHelper);
* // Perform the download.
* hlsDownloader.download(progressListener);
* // Access downloaded data using CacheDataSource
* CacheDataSource cacheDataSource =
* new CacheDataSource(cache, factory.createDataSource(), CacheDataSource.FLAG_BLOCK_ON_CACHE);
* }</pre>
*/
public final class HlsDownloader extends SegmentDownloader<HlsPlaylist> {
/**
* @param playlistUri The {@link Uri} of the playlist to be downloaded.
* @param streamKeys Keys defining which renditions in the playlist should be selected for
* download. If empty, all renditions are downloaded.
* @param constructorHelper A {@link DownloaderConstructorHelper} instance.
*/
public HlsDownloader(
Uri playlistUri, List<StreamKey> streamKeys, DownloaderConstructorHelper constructorHelper) {
super(playlistUri, streamKeys, constructorHelper);
}
@Override
protected HlsPlaylist getManifest(DataSource dataSource, DataSpec dataSpec) throws IOException {
return loadManifest(dataSource, dataSpec);
}
@Override
protected List<Segment> getSegments(
DataSource dataSource, HlsPlaylist playlist, boolean allowIncompleteList) throws IOException {
ArrayList<DataSpec> mediaPlaylistDataSpecs = new ArrayList<>();
if (playlist instanceof HlsMasterPlaylist) {
HlsMasterPlaylist masterPlaylist = (HlsMasterPlaylist) playlist;
addMediaPlaylistDataSpecs(masterPlaylist.mediaPlaylistUrls, mediaPlaylistDataSpecs);
} else {
mediaPlaylistDataSpecs.add(
SegmentDownloader.getCompressibleDataSpec(Uri.parse(playlist.baseUri)));
}
ArrayList<Segment> segments = new ArrayList<>();
HashSet<Uri> seenEncryptionKeyUris = new HashSet<>();
for (DataSpec mediaPlaylistDataSpec : mediaPlaylistDataSpecs) {
segments.add(new Segment(/* startTimeUs= */ 0, mediaPlaylistDataSpec));
HlsMediaPlaylist mediaPlaylist;
try {
mediaPlaylist = (HlsMediaPlaylist) loadManifest(dataSource, mediaPlaylistDataSpec);
} catch (IOException e) {
if (!allowIncompleteList) {
throw e;
}
// Generating an incomplete segment list is allowed. Advance to the next media playlist.
continue;
}
HlsMediaPlaylist.Segment lastInitSegment = null;
List<HlsMediaPlaylist.Segment> hlsSegments = mediaPlaylist.segments;
for (int i = 0; i < hlsSegments.size(); i++) {
HlsMediaPlaylist.Segment segment = hlsSegments.get(i);
HlsMediaPlaylist.Segment initSegment = segment.initializationSegment;
if (initSegment != null && initSegment != lastInitSegment) {
lastInitSegment = initSegment;
addSegment(mediaPlaylist, initSegment, seenEncryptionKeyUris, segments);
}
addSegment(mediaPlaylist, segment, seenEncryptionKeyUris, segments);
}
}
return segments;
}
private void addMediaPlaylistDataSpecs(List<Uri> mediaPlaylistUrls, List<DataSpec> out) {
for (int i = 0; i < mediaPlaylistUrls.size(); i++) {
out.add(SegmentDownloader.getCompressibleDataSpec(mediaPlaylistUrls.get(i)));
}
}
private static HlsPlaylist loadManifest(DataSource dataSource, DataSpec dataSpec)
throws IOException {
return ParsingLoadable.load(
dataSource, new HlsPlaylistParser(), dataSpec, C.DATA_TYPE_MANIFEST);
}
private void addSegment(
HlsMediaPlaylist mediaPlaylist,
HlsMediaPlaylist.Segment segment,
HashSet<Uri> seenEncryptionKeyUris,
ArrayList<Segment> out) {
String baseUri = mediaPlaylist.baseUri;
long startTimeUs = mediaPlaylist.startTimeUs + segment.relativeStartTimeUs;
if (segment.fullSegmentEncryptionKeyUri != null) {
Uri keyUri = UriUtil.resolveToUri(baseUri, segment.fullSegmentEncryptionKeyUri);
if (seenEncryptionKeyUris.add(keyUri)) {
out.add(new Segment(startTimeUs, SegmentDownloader.getCompressibleDataSpec(keyUri)));
}
}
Uri segmentUri = UriUtil.resolveToUri(baseUri, segment.url);
DataSpec dataSpec =
new DataSpec(segmentUri, segment.byterangeOffset, segment.byterangeLength, /* key= */ null);
out.add(new Segment(startTimeUs, dataSpec));
}
}
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