mirror of https://github.com/TeamNewPipe/NewPipe
402 lines
13 KiB
Java
402 lines
13 KiB
Java
package org.schabi.newpipe.player;
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import android.util.Log;
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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_info.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.SwapEvent;
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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.MaybeObserver;
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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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class MediaSourceManager {
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private final String TAG = "MediaSourceManager@" + 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 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 final List<Integer> sourceToQueueIndex;
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private final PlaybackListener playbackListener;
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private final PlayQueue playQueue;
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private Subscription playQueueReactor;
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private Subscription loadingReactor;
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private CompositeDisposable disposables;
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private boolean isBlocked;
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interface PlaybackListener {
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/*
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* Called when the initial video has been loaded.
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* Signals to the listener that the media source is prepared, and
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* the player is ready to go.
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* */
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void init();
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/*
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* Called when the stream at the current queue index is not ready yet.
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* Signals to the listener to block the player from playing anything.
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* */
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void block();
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/*
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* Called when the stream at the current queue index is ready.
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* Signals to the listener to resume the player.
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* May be called at any time, even when the player is unblocked.
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* */
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void unblock();
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/*
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* Called when the queue index is refreshed.
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* Signals to the listener to synchronize the player's window to the manager's
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* window.
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* */
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void sync(final int windowIndex, final long windowPos, final StreamInfo info);
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/*
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* Requests the listener to resolve a stream info into a media source respective
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* of the listener's implementation (background, popup or main video player),
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* */
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MediaSource sourceOf(final StreamInfo info);
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}
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MediaSourceManager(@NonNull final MediaSourceManager.PlaybackListener listener,
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@NonNull final PlayQueue playQueue) {
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this.sources = new DynamicConcatenatingMediaSource();
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this.sourceToQueueIndex = Collections.synchronizedList(new ArrayList<Integer>());
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this.playbackListener = listener;
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this.playQueue = playQueue;
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disposables = new CompositeDisposable();
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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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int getCurrentSourceIndex() {
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return sourceToQueueIndex.indexOf(playQueue.getIndex());
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}
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@NonNull
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DynamicConcatenatingMediaSource getMediaSource() {
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return sources;
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}
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/*
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* Called when the player has seamlessly transitioned to another stream.
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* Currently only expecting transitioning to the next stream and updates
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* the play queue that a transition has occurred.
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* */
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void refresh(final int newSourceIndex) {
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if (newSourceIndex == getCurrentSourceIndex()) return;
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if (newSourceIndex == getCurrentSourceIndex() + 1) {
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playQueue.incrementIndex();
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} else {
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//something went wrong
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Log.e(TAG, "Refresh media failed, reloading.");
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}
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sync();
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}
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void report(final Exception error) {
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// ignore error checking for now, just remove the current index
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if (error != null && !isBlocked) {
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doBlock();
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}
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final int index = playQueue.getIndex();
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remove(index);
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playQueue.remove(index);
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tryUnblock();
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sync();
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}
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void dispose() {
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if (loadingReactor != null) loadingReactor.cancel();
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if (playQueueReactor != null) playQueueReactor.cancel();
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if (disposables != null) disposables.dispose();
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loadingReactor = null;
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playQueueReactor = null;
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disposables = 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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init();
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break;
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case APPEND:
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load();
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break;
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case SELECT:
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onSelect();
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break;
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case REMOVE:
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final RemoveEvent removeEvent = (RemoveEvent) event;
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remove(removeEvent.index());
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break;
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case SWAP:
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final SwapEvent swapEvent = (SwapEvent) event;
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swap(swapEvent.getFrom(), swapEvent.getTo());
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break;
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case NEXT:
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default:
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break;
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}
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if (!isPlayQueueReady() && !isBlocked) {
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doBlock();
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playQueue.fetch();
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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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dispose();
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}
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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 void doBlock() {
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playbackListener.block();
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isBlocked = true;
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}
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private void tryUnblock() {
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if (isPlayQueueReady() && isCurrentIndexLoaded() && isBlocked) {
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isBlocked = false;
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playbackListener.unblock();
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}
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}
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/*
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* Responds to a SELECT event.
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* When a change occur, the manager prepares by loading more.
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* If the current item has not been fully loaded,
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* */
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private void onSelect() {
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if (isCurrentIndexLoaded()) {
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sync();
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} else if (!isBlocked) {
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doBlock();
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}
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load();
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}
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private void sync() {
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final Consumer<StreamInfo> onSuccess = 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(getCurrentSourceIndex(), 0L, streamInfo);
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}
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};
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playQueue.getCurrent().getStream().subscribe(onSuccess);
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}
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private void load() {
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final int currentIndex = playQueue.getIndex();
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load(playQueue.get(currentIndex));
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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 init() {
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final PlayQueueItem init = playQueue.getCurrent();
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init.getStream().subscribe(new MaybeObserver<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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disposables.add(d);
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} else {
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d.dispose();
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}
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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);
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insert(playQueue.indexOf(init), source);
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if (getCurrentSourceIndex() != -1) {
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playbackListener.init();
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sync();
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load();
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} else {
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init();
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}
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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(init));
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init();
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}
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@Override
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public void onComplete() {
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playQueue.remove(playQueue.indexOf(init));
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init();
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}
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});
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}
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private void load(final PlayQueueItem item) {
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item.getStream().subscribe(new MaybeObserver<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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disposables.add(d);
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} else {
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d.dispose();
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}
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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);
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insert(playQueue.indexOf(item), source);
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tryUnblock();
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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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@Override
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public void onComplete() {
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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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/*//////////////////////////////////////////////////////////////////////////
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// Media Source List Manipulation
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//////////////////////////////////////////////////////////////////////////*/
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public void replace(final int queueIndex, final MediaSource source) {
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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) {
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// Add the source after the one to remove, so the window will remain the same in the player
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sources.addMediaSource(sourceIndex + 1, source);
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sources.removeMediaSource(sourceIndex);
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}
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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) {
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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) {
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sourceToQueueIndex.remove(sourceIndex);
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sources.removeMediaSource(sourceIndex);
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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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private void swap(final int source, final int target) {
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final int sourceIndex = sourceToQueueIndex.indexOf(source);
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final int targetIndex = sourceToQueueIndex.indexOf(target);
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if (sourceIndex != -1 && targetIndex != -1) {
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sources.moveMediaSource(sourceIndex, targetIndex);
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} else if (sourceIndex != -1) {
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remove(sourceIndex);
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} else if (targetIndex != -1) {
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remove(targetIndex);
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}
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}
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}
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