CastTimelineTracker.java
/*
* 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 androidx.media3.cast;
import android.util.SparseArray;
import androidx.annotation.Nullable;
import androidx.media3.common.C;
import com.google.android.gms.cast.MediaInfo;
import com.google.android.gms.cast.MediaQueueItem;
import com.google.android.gms.cast.MediaStatus;
import com.google.android.gms.cast.framework.media.RemoteMediaClient;
import java.util.HashSet;
/**
* Creates {@link CastTimeline CastTimelines} from cast receiver app status updates.
*
* <p>This class keeps track of the duration reported by the current item to fill any missing
* durations in the media queue items [See internal: b/65152553].
*/
/* package */ final class CastTimelineTracker {
private final SparseArray<CastTimeline.ItemData> itemIdToData;
public CastTimelineTracker() {
itemIdToData = new SparseArray<>();
}
/**
* Returns a {@link CastTimeline} that represents the state of the given {@code
* remoteMediaClient}.
*
* <p>Returned timelines may contain values obtained from {@code remoteMediaClient} in previous
* invocations of this method.
*
* @param remoteMediaClient The Cast media client.
* @return A {@link CastTimeline} that represents the given {@code remoteMediaClient} status.
*/
public CastTimeline getCastTimeline(RemoteMediaClient remoteMediaClient) {
int[] itemIds = remoteMediaClient.getMediaQueue().getItemIds();
if (itemIds.length > 0) {
// Only remove unused items when there is something in the queue to avoid removing all entries
// if the remote media client clears the queue temporarily. See [Internal ref: b/128825216].
removeUnusedItemDataEntries(itemIds);
}
// TODO: Reset state when the app instance changes [Internal ref: b/129672468].
MediaStatus mediaStatus = remoteMediaClient.getMediaStatus();
if (mediaStatus == null) {
return CastTimeline.EMPTY_CAST_TIMELINE;
}
int currentItemId = mediaStatus.getCurrentItemId();
updateItemData(
currentItemId, mediaStatus.getMediaInfo(), /* defaultPositionUs= */ C.TIME_UNSET);
for (MediaQueueItem item : mediaStatus.getQueueItems()) {
long defaultPositionUs = (long) (item.getStartTime() * C.MICROS_PER_SECOND);
updateItemData(item.getItemId(), item.getMedia(), defaultPositionUs);
}
return new CastTimeline(itemIds, itemIdToData);
}
private void updateItemData(int itemId, @Nullable MediaInfo mediaInfo, long defaultPositionUs) {
CastTimeline.ItemData previousData = itemIdToData.get(itemId, CastTimeline.ItemData.EMPTY);
long durationUs = CastUtils.getStreamDurationUs(mediaInfo);
if (durationUs == C.TIME_UNSET) {
durationUs = previousData.durationUs;
}
boolean isLive =
mediaInfo == null
? previousData.isLive
: mediaInfo.getStreamType() == MediaInfo.STREAM_TYPE_LIVE;
if (defaultPositionUs == C.TIME_UNSET) {
defaultPositionUs = previousData.defaultPositionUs;
}
itemIdToData.put(itemId, previousData.copyWithNewValues(durationUs, defaultPositionUs, isLive));
}
private void removeUnusedItemDataEntries(int[] itemIds) {
HashSet<Integer> scratchItemIds = new HashSet<>(/* initialCapacity= */ itemIds.length * 2);
for (int id : itemIds) {
scratchItemIds.add(id);
}
int index = 0;
while (index < itemIdToData.size()) {
if (!scratchItemIds.contains(itemIdToData.keyAt(index))) {
itemIdToData.removeAt(index);
} else {
index++;
}
}
}
}