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Implement MappingAudioSource on Android
Inspiration taken from: - google/ExoPlayer#7087 - google/ExoPlayer#5883 - google/ExoPlayer#7279
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just_audio/android/src/main/java/com/ryanheise/just_audio/LazyMediaSource.java
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| package com.ryanheise.just_audio; | ||
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| import android.os.Handler; | ||
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| import com.google.android.exoplayer2.MediaItem; | ||
| import com.google.android.exoplayer2.Timeline; | ||
| import com.google.android.exoplayer2.analytics.PlayerId; | ||
| import com.google.android.exoplayer2.drm.DrmSessionEventListener; | ||
| import com.google.android.exoplayer2.source.MediaPeriod; | ||
| import com.google.android.exoplayer2.source.MediaSource; | ||
| import com.google.android.exoplayer2.source.MediaSourceEventListener; | ||
| import com.google.android.exoplayer2.upstream.Allocator; | ||
| import com.google.android.exoplayer2.upstream.TransferListener; | ||
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| import java.io.IOException; | ||
| import java.util.HashMap; | ||
| import java.util.Map; | ||
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| /** | ||
| * A {@link MediaSource} that lazily defers to another {@link MediaSource} when it is required. | ||
| * <p> | ||
| * This {@link MediaSource} must be used with a {@link com.google.android.exoplayer2.source.MaskingMediaSource}. | ||
| */ | ||
| class LazyMediaSource implements MediaSource { | ||
| private final LazyMediaSourceProvider mediaSourceProvider; | ||
| public final String id; | ||
| public final MediaItem placeholderMediaItem; | ||
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| private final Map<MediaSourceEventListener, Handler> pendingEventListeners = new HashMap<>(); | ||
| private final Map<DrmSessionEventListener, Handler> pendingDrmEventListeners = new HashMap<>(); | ||
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| private MediaSource mediaSource; | ||
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| LazyMediaSource(LazyMediaSourceProvider mediaSourceProvider, String id, MediaItem placeholderMediaItem) { | ||
| this.mediaSourceProvider = mediaSourceProvider; | ||
| this.id = id; | ||
| this.placeholderMediaItem = placeholderMediaItem; | ||
| } | ||
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| @Override | ||
| public void addEventListener(Handler handler, MediaSourceEventListener eventListener) { | ||
| if (mediaSource == null) { | ||
| pendingEventListeners.put(eventListener, handler); | ||
| } else { | ||
| mediaSource.addEventListener(handler, eventListener); | ||
| } | ||
| } | ||
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| @Override | ||
| public void removeEventListener(MediaSourceEventListener eventListener) { | ||
| if (mediaSource == null) { | ||
| pendingEventListeners.remove(eventListener); | ||
| } else { | ||
| mediaSource.removeEventListener(eventListener); | ||
| } | ||
| } | ||
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| @Override | ||
| public void addDrmEventListener(Handler handler, DrmSessionEventListener eventListener) { | ||
| if (mediaSource == null) { | ||
| pendingDrmEventListeners.put(eventListener, handler); | ||
| } else { | ||
| mediaSource.addDrmEventListener(handler, eventListener); | ||
| } | ||
| } | ||
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| @Override | ||
| public void removeDrmEventListener(DrmSessionEventListener eventListener) { | ||
| if (mediaSource == null) { | ||
| pendingDrmEventListeners.remove(eventListener); | ||
| } else { | ||
| mediaSource.removeDrmEventListener(eventListener); | ||
| } | ||
| } | ||
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| @Override | ||
| public Timeline getInitialTimeline() { | ||
| if (mediaSource == null) return null; | ||
| return mediaSource.getInitialTimeline(); | ||
| } | ||
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| @Override | ||
| public boolean isSingleWindow() { | ||
| if (mediaSource == null) return false; | ||
| return mediaSource.isSingleWindow(); | ||
| } | ||
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| @Override | ||
| public MediaItem getMediaItem() { | ||
| if (mediaSource == null) { | ||
| return placeholderMediaItem; | ||
| } else { | ||
| return mediaSource.getMediaItem(); | ||
| } | ||
| } | ||
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| @Override | ||
| public void prepareSource( | ||
| MediaSourceCaller caller, | ||
| TransferListener mediaTransferListener, | ||
| PlayerId playerId | ||
| ) { | ||
| mediaSourceProvider.createMediaSource(id, (mediaSource) -> { | ||
| this.mediaSource = mediaSource; | ||
| for (Map.Entry<MediaSourceEventListener, Handler> entry : pendingEventListeners.entrySet()) { | ||
| mediaSource.addEventListener(entry.getValue(), entry.getKey()); | ||
| } | ||
| pendingEventListeners.clear(); | ||
| for (Map.Entry<DrmSessionEventListener, Handler> entry : pendingDrmEventListeners.entrySet()) { | ||
| mediaSource.addDrmEventListener(entry.getValue(), entry.getKey()); | ||
| } | ||
| pendingDrmEventListeners.clear(); | ||
| mediaSource.prepareSource(caller, mediaTransferListener, playerId); | ||
| }); | ||
| } | ||
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| @Override | ||
| public void maybeThrowSourceInfoRefreshError() throws IOException { | ||
| if (mediaSource == null) return; | ||
| mediaSource.maybeThrowSourceInfoRefreshError(); | ||
| } | ||
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| @Override | ||
| public void enable(MediaSourceCaller caller) { | ||
| if (mediaSource == null) throw new IllegalStateException(); | ||
| mediaSource.enable(caller); | ||
| } | ||
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| @Override | ||
| public MediaPeriod createPeriod(MediaPeriodId id, Allocator allocator, long startPositionUs) { | ||
| if (mediaSource == null) throw new IllegalStateException(); | ||
| return mediaSource.createPeriod(id, allocator, startPositionUs); | ||
| } | ||
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| @Override | ||
| public void releasePeriod(MediaPeriod mediaPeriod) { | ||
| if (mediaSource == null) throw new IllegalStateException(); | ||
| mediaSource.releasePeriod(mediaPeriod); | ||
| } | ||
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| @Override | ||
| public void disable(MediaSourceCaller caller) { | ||
| if (mediaSource == null) throw new IllegalStateException(); | ||
| mediaSource.disable(caller); | ||
| } | ||
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| @Override | ||
| public void releaseSource(MediaSourceCaller caller) { | ||
| if (mediaSource == null) return; | ||
| mediaSource.releaseSource(caller); | ||
| } | ||
| } | ||
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| interface LazyMediaSourceReceiver { | ||
| void onMediaSourceCreated(MediaSource mediaSource); | ||
| } | ||
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| interface LazyMediaSourceProvider { | ||
| void createMediaSource(String id, LazyMediaSourceReceiver receiver); | ||
| } |