mirror of https://github.com/TeamNewPipe/NewPipe
295 lines
10 KiB
Java
295 lines
10 KiB
Java
package org.schabi.newpipe.player.playback;
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import android.support.annotation.Nullable;
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import com.google.android.exoplayer2.source.DynamicConcatenatingMediaSource;
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import com.google.android.exoplayer2.source.MediaSource;
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import org.reactivestreams.Subscriber;
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import org.reactivestreams.Subscription;
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import org.schabi.newpipe.extractor.stream.StreamInfo;
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import org.schabi.newpipe.playlist.PlayQueue;
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import org.schabi.newpipe.playlist.PlayQueueItem;
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import org.schabi.newpipe.playlist.events.PlayQueueMessage;
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import org.schabi.newpipe.playlist.events.RemoveEvent;
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import org.schabi.newpipe.playlist.events.UpdateEvent;
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import java.util.ArrayList;
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import java.util.Collections;
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import java.util.List;
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import io.reactivex.SingleObserver;
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import io.reactivex.android.schedulers.AndroidSchedulers;
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import io.reactivex.annotations.NonNull;
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import io.reactivex.disposables.CompositeDisposable;
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import io.reactivex.disposables.Disposable;
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import io.reactivex.functions.Consumer;
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public class PlaybackManager {
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private final String TAG = "PlaybackManager@" + Integer.toHexString(hashCode());
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// One-side rolling window size for default loading
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// Effectively loads WINDOW_SIZE * 2 streams
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private static final int WINDOW_SIZE = 3;
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private final PlaybackListener playbackListener;
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private final PlayQueue playQueue;
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private DynamicConcatenatingMediaSource sources;
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// sourceToQueueIndex maps media source index to play queue index
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// Invariant 1: this list is sorted in ascending order
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// Invariant 2: this list contains no duplicates
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private List<Integer> sourceToQueueIndex;
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private Subscription playQueueReactor;
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private Disposable syncReactor;
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private CompositeDisposable disposables;
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private boolean isBlocked;
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private boolean hasReset;
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public PlaybackManager(@NonNull final PlaybackListener listener,
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@NonNull final PlayQueue playQueue) {
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this.playbackListener = listener;
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this.playQueue = playQueue;
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this.disposables = new CompositeDisposable();
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this.sources = new DynamicConcatenatingMediaSource();
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this.sourceToQueueIndex = Collections.synchronizedList(new ArrayList<Integer>());
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playQueue.getBroadcastReceiver()
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.observeOn(AndroidSchedulers.mainThread())
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.subscribe(getReactor());
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}
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/*//////////////////////////////////////////////////////////////////////////
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// Exposed Methods
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//////////////////////////////////////////////////////////////////////////*/
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/*
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* Returns the media source index of the currently playing stream.
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* */
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public int getCurrentSourceIndex() {
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return sourceToQueueIndex.indexOf(playQueue.getIndex());
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}
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public int expectedTimelineSize() {
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return sources.getSize();
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}
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public void dispose() {
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if (playQueueReactor != null) playQueueReactor.cancel();
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if (disposables != null) disposables.dispose();
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if (syncReactor != null) syncReactor.dispose();
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if (sources != null) sources.releaseSource();
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if (sourceToQueueIndex != null) sourceToQueueIndex.clear();
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playQueueReactor = null;
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disposables = null;
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syncReactor = null;
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sources = null;
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sourceToQueueIndex = null;
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}
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/*//////////////////////////////////////////////////////////////////////////
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// Event Reactor
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//////////////////////////////////////////////////////////////////////////*/
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private Subscriber<PlayQueueMessage> getReactor() {
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return new Subscriber<PlayQueueMessage>() {
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@Override
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public void onSubscribe(@NonNull Subscription d) {
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if (playQueueReactor != null) playQueueReactor.cancel();
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playQueueReactor = d;
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playQueueReactor.request(1);
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}
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@Override
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public void onNext(@NonNull PlayQueueMessage event) {
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// why no pattern matching in Java =(
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switch (event.type()) {
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case INIT:
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tryBlock();
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resetSources();
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break;
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case APPEND:
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break;
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case SELECT:
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if (isBlocked) break;
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if (isCurrentIndexLoaded()) sync(); else tryBlock();
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break;
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case REMOVE:
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final RemoveEvent removeEvent = (RemoveEvent) event;
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if (removeEvent.isCurrent()) tryBlock();
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remove(removeEvent.index(), true);
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break;
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case UPDATE:
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final UpdateEvent updateEvent = (UpdateEvent) event;
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tryBlock();
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remove(updateEvent.index(), false);
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break;
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case SHUFFLE:
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tryBlock();
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resetSources();
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break;
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default:
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break;
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}
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if (!isPlayQueueReady()) {
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tryBlock();
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playQueue.fetch();
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} else if (playQueue.isEmpty()) {
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playbackListener.shutdown();
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} else {
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load(); // All event warrants a load
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}
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if (playQueueReactor != null) playQueueReactor.request(1);
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}
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@Override
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public void onError(@NonNull Throwable e) {}
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@Override
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public void onComplete() {}
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};
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}
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/*//////////////////////////////////////////////////////////////////////////
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// Internal Helpers
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//////////////////////////////////////////////////////////////////////////*/
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private boolean isPlayQueueReady() {
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return playQueue.isComplete() || playQueue.size() - playQueue.getIndex() > WINDOW_SIZE;
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}
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private boolean isCurrentIndexLoaded() {
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return getCurrentSourceIndex() != -1;
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}
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private boolean tryBlock() {
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if (!isBlocked) {
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playbackListener.block();
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isBlocked = true;
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return true;
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}
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return false;
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}
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private boolean tryUnblock() {
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if (isPlayQueueReady() && isCurrentIndexLoaded() && isBlocked) {
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if (hasReset) {
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playbackListener.prepare(sources);
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hasReset = false;
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}
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isBlocked = false;
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playbackListener.unblock();
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return true;
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}
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return false;
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}
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private void sync() {
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final PlayQueueItem currentItem = playQueue.getCurrent();
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final Consumer<StreamInfo> syncPlayback = new Consumer<StreamInfo>() {
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@Override
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public void accept(StreamInfo streamInfo) throws Exception {
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playbackListener.sync(streamInfo, currentItem.getSortedQualityIndex());
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}
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};
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currentItem.getStream().subscribe(syncPlayback);
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}
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private void load() {
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// The current item has higher priority
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final int currentIndex = playQueue.getIndex();
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final PlayQueueItem currentItem = playQueue.get(currentIndex);
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if (currentItem != null) load(currentItem);
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else return;
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// The rest are just for seamless playback
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final int leftBound = Math.max(0, currentIndex - WINDOW_SIZE);
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final int rightBound = Math.min(playQueue.size(), currentIndex + WINDOW_SIZE);
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final List<PlayQueueItem> items = playQueue.getStreams().subList(leftBound, rightBound);
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for (final PlayQueueItem item: items) {
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load(item);
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}
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}
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private void load(@Nullable final PlayQueueItem item) {
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if (item == null) return;
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item.getStream().subscribe(new SingleObserver<StreamInfo>() {
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@Override
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public void onSubscribe(@NonNull Disposable d) {
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if (disposables == null) {
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d.dispose();
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return;
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}
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disposables.add(d);
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}
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@Override
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public void onSuccess(@NonNull StreamInfo streamInfo) {
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final MediaSource source = playbackListener.sourceOf(streamInfo, item.getSortedQualityIndex());
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insert(playQueue.indexOf(item), source);
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if (tryUnblock()) sync();
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}
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@Override
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public void onError(@NonNull Throwable e) {
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playQueue.remove(playQueue.indexOf(item));
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load();
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}
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});
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}
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private void resetSources() {
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if (this.disposables != null) this.disposables.clear();
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if (this.sources != null) this.sources.releaseSource();
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if (this.sourceToQueueIndex != null) this.sourceToQueueIndex.clear();
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this.sources = new DynamicConcatenatingMediaSource();
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this.hasReset = true;
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}
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/*//////////////////////////////////////////////////////////////////////////
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// Media Source List Manipulation
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//////////////////////////////////////////////////////////////////////////*/
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// Insert source into playlist with position in respect to the play queue
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// If the play queue index already exists, then the insert is ignored
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private void insert(final int queueIndex, final MediaSource source) {
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if (queueIndex < 0) return;
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int pos = Collections.binarySearch(sourceToQueueIndex, queueIndex);
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if (pos < 0) {
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final int sourceIndex = -pos-1;
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sourceToQueueIndex.add(sourceIndex, queueIndex);
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sources.addMediaSource(sourceIndex, source);
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}
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}
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private void remove(final int queueIndex, final boolean cascade) {
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if (queueIndex < 0) return;
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final int sourceIndex = sourceToQueueIndex.indexOf(queueIndex);
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if (sourceIndex == -1) return;
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sourceToQueueIndex.remove(sourceIndex);
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sources.removeMediaSource(sourceIndex);
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if (cascade) {
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// Will be slow on really large arrays, fast enough for typical use case
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for (int i = sourceIndex; i < sourceToQueueIndex.size(); i++) {
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sourceToQueueIndex.set(i, sourceToQueueIndex.get(i) - 1);
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}
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}
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}
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}
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