feat(Prime Video): Add Skip ads patch (#4824)

extensions/primevideo/build.gradle.kts

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+dependencies {
+    compileOnly(project(":extensions:shared:library"))
+    compileOnly(project(":extensions:primevideo:stub"))
+}

extensions/primevideo/src/main/AndroidManifest.xml

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+<manifest/>

extensions/primevideo/src/main/java/app/revanced/extension/primevideo/ads/SkipAdsPatch.java

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+package app.revanced.extension.primevideo.ads;
+
+import com.amazon.avod.fsm.SimpleTrigger;
+import com.amazon.avod.media.ads.AdBreak;
+import com.amazon.avod.media.ads.internal.state.AdBreakTrigger;
+import com.amazon.avod.media.ads.internal.state.AdEnabledPlayerTriggerType;
+import com.amazon.avod.media.playback.VideoPlayer;
+import com.amazon.avod.media.ads.internal.state.ServerInsertedAdBreakState;
+
+import app.revanced.extension.shared.Logger;
+
+@SuppressWarnings("unused")
+public final class SkipAdsPatch {
+    public static void enterServerInsertedAdBreakState(ServerInsertedAdBreakState state, AdBreakTrigger trigger, VideoPlayer player) {
+        try {
+            AdBreak adBreak = trigger.getBreak();
+
+            // There are two scenarios when entering the original method:
+            //  1. Player naturally entered an ad break while watching a video.
+            //  2. User is skipped/scrubbed to a position on the timeline. If seek position is past an ad break,
+            //     user is forced to watch an ad before continuing.
+            //
+            // Scenario 2 is indicated by trigger.getSeekStartPosition() != null, so skip directly to the scrubbing
+            // target. Otherwise, just calculate when the ad break should end and skip to there.
+            if (trigger.getSeekStartPosition() != null)
+                player.seekTo(trigger.getSeekTarget().getTotalMilliseconds());
+            else
+                player.seekTo(player.getCurrentPosition() + adBreak.getDurationExcludingAux().getTotalMilliseconds());
+
+            // Send "end of ads" trigger to state machine so everything doesn't get whacky.
+            state.doTrigger(new SimpleTrigger(AdEnabledPlayerTriggerType.NO_MORE_ADS_SKIP_TRANSITION));
+        } catch (Exception ex) {
+            Logger.printException(() -> "Failed skipping ads", ex);
+        }
+    }
+}

extensions/primevideo/stub/build.gradle.kts

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+plugins {
+    id(libs.plugins.android.library.get().pluginId)
+}
+
+android {
+    namespace = "app.revanced.extension"
+    compileSdk = 34
+
+    defaultConfig {
+        minSdk = 21
+    }
+
+    compileOptions {
+        sourceCompatibility = JavaVersion.VERSION_11
+        targetCompatibility = JavaVersion.VERSION_11
+    }
+}

extensions/primevideo/stub/src/main/AndroidManifest.xml

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+<manifest/>

extensions/primevideo/stub/src/main/java/com/amazon/avod/fsm/SimpleTrigger.java

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+package com.amazon.avod.fsm;
+
+public final class SimpleTrigger<T> implements Trigger<T> {
+    public SimpleTrigger(T triggerType) {
+    }
+}

extensions/primevideo/stub/src/main/java/com/amazon/avod/fsm/StateBase.java

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+package com.amazon.avod.fsm;
+
+public abstract class StateBase<S, T> {
+    // This method orginally has protected access (modified in patch code).
+    public void doTrigger(Trigger<T> trigger) {
+    }
+}

extensions/primevideo/stub/src/main/java/com/amazon/avod/fsm/Trigger.java

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+package com.amazon.avod.fsm;
+
+public interface Trigger<T> {
+}

extensions/primevideo/stub/src/main/java/com/amazon/avod/media/TimeSpan.java

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+package com.amazon.avod.media;
+
+public final class TimeSpan {
+    public long getTotalMilliseconds() {
+        throw new UnsupportedOperationException();
+    }
+}

extensions/primevideo/stub/src/main/java/com/amazon/avod/media/ads/AdBreak.java

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+package com.amazon.avod.media.ads;
+
+import com.amazon.avod.media.TimeSpan;
+
+public interface AdBreak {
+    TimeSpan getDurationExcludingAux();
+}

extensions/primevideo/stub/src/main/java/com/amazon/avod/media/ads/internal/state/AdBreakState.java

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+package com.amazon.avod.media.ads.internal.state;
+
+public abstract class AdBreakState extends AdEnabledPlaybackState {
+}

extensions/primevideo/stub/src/main/java/com/amazon/avod/media/ads/internal/state/AdBreakTrigger.java

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+package com.amazon.avod.media.ads.internal.state;
+
+import com.amazon.avod.media.ads.AdBreak;
+import com.amazon.avod.media.TimeSpan;
+
+public class AdBreakTrigger {
+    public AdBreak getBreak() {
+        throw new UnsupportedOperationException();
+    }
+
+    public TimeSpan getSeekTarget() {
+        throw new UnsupportedOperationException();
+    }
+
+    public TimeSpan getSeekStartPosition() {
+        throw new UnsupportedOperationException();
+    }
+}

extensions/primevideo/stub/src/main/java/com/amazon/avod/media/ads/internal/state/AdEnabledPlaybackState.java

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+package com.amazon.avod.media.ads.internal.state;
+
+import com.amazon.avod.fsm.StateBase;
+import com.amazon.avod.media.playback.state.PlayerStateType;
+import com.amazon.avod.media.playback.state.trigger.PlayerTriggerType;
+
+public class AdEnabledPlaybackState extends StateBase<PlayerStateType, PlayerTriggerType> {
+}

extensions/primevideo/stub/src/main/java/com/amazon/avod/media/ads/internal/state/AdEnabledPlayerTriggerType.java

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+package com.amazon.avod.media.ads.internal.state;
+
+public enum AdEnabledPlayerTriggerType {
+    NO_MORE_ADS_SKIP_TRANSITION
+}

extensions/primevideo/stub/src/main/java/com/amazon/avod/media/ads/internal/state/ServerInsertedAdBreakState.java

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+package com.amazon.avod.media.ads.internal.state;
+
+public class ServerInsertedAdBreakState extends AdBreakState {
+}

extensions/primevideo/stub/src/main/java/com/amazon/avod/media/playback/VideoPlayer.java

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+package com.amazon.avod.media.playback;
+
+public interface VideoPlayer {
+    long getCurrentPosition();
+
+    void seekTo(long positionMs);
+}

extensions/primevideo/stub/src/main/java/com/amazon/avod/media/playback/state/PlayerStateType.java

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+package com.amazon.avod.media.playback.state;
+
+public interface PlayerStateType {
+}

extensions/primevideo/stub/src/main/java/com/amazon/avod/media/playback/state/trigger/PlayerTriggerType.java

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+package com.amazon.avod.media.playback.state.trigger;
+
+public interface PlayerTriggerType {
+}