Add nullable annotations to Renderer constructors

-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=165437929

library/core/src/main/java/com/google/android/exoplayer2/DefaultRenderersFactory.java

@@ -19,6 +19,7 @@ import android.content.Context;
 import android.os.Handler;
 import android.os.Looper;
 import android.support.annotation.IntDef;
+import android.support.annotation.Nullable;
 import android.util.Log;
 import com.google.android.exoplayer2.audio.AudioCapabilities;
 import com.google.android.exoplayer2.audio.AudioProcessor;
@@ -79,7 +80,7 @@ public class DefaultRenderersFactory implements RenderersFactory {
   protected static final int MAX_DROPPED_VIDEO_FRAME_COUNT_TO_NOTIFY = 50;
 
   private final Context context;
-  private final DrmSessionManager<FrameworkMediaCrypto> drmSessionManager;
+  @Nullable private final DrmSessionManager<FrameworkMediaCrypto> drmSessionManager;
   private final @ExtensionRendererMode int extensionRendererMode;
   private final long allowedVideoJoiningTimeMs;
 
@@ -96,29 +97,28 @@ public class DefaultRenderersFactory implements RenderersFactory {
    *     playbacks are not required.
    */
   public DefaultRenderersFactory(Context context,
-      DrmSessionManager<FrameworkMediaCrypto> drmSessionManager) {
+      @Nullable DrmSessionManager<FrameworkMediaCrypto> drmSessionManager) {
     this(context, drmSessionManager, EXTENSION_RENDERER_MODE_OFF);
   }
 
   /**
    * @param context A {@link Context}.
    * @param drmSessionManager An optional {@link DrmSessionManager}. May be null if DRM protected
-   *     playbacks are not required..
+   *     playbacks are not required.
    * @param extensionRendererMode The extension renderer mode, which determines if and how
    *     available extension renderers are used. Note that extensions must be included in the
    *     application build for them to be considered available.
    */
   public DefaultRenderersFactory(Context context,
-      DrmSessionManager<FrameworkMediaCrypto> drmSessionManager,
+      @Nullable DrmSessionManager<FrameworkMediaCrypto> drmSessionManager,
       @ExtensionRendererMode int extensionRendererMode) {
-    this(context, drmSessionManager, extensionRendererMode,
-        DEFAULT_ALLOWED_VIDEO_JOINING_TIME_MS);
+    this(context, drmSessionManager, extensionRendererMode, DEFAULT_ALLOWED_VIDEO_JOINING_TIME_MS);
   }
 
   /**
    * @param context A {@link Context}.
    * @param drmSessionManager An optional {@link DrmSessionManager}. May be null if DRM protected
-   *     playbacks are not required..
+   *     playbacks are not required.
    * @param extensionRendererMode The extension renderer mode, which determines if and how
    *     available extension renderers are used. Note that extensions must be included in the
    *     application build for them to be considered available.
@@ -126,7 +126,7 @@ public class DefaultRenderersFactory implements RenderersFactory {
    *     to seamlessly join an ongoing playback.
    */
   public DefaultRenderersFactory(Context context,
-      DrmSessionManager<FrameworkMediaCrypto> drmSessionManager,
+      @Nullable DrmSessionManager<FrameworkMediaCrypto> drmSessionManager,
       @ExtensionRendererMode int extensionRendererMode, long allowedVideoJoiningTimeMs) {
     this.context = context;
     this.drmSessionManager = drmSessionManager;
@@ -137,8 +137,8 @@ public class DefaultRenderersFactory implements RenderersFactory {
   @Override
   public Renderer[] createRenderers(Handler eventHandler,
       VideoRendererEventListener videoRendererEventListener,
-      AudioRendererEventListener audioRendererEventListener,
-      TextRenderer.Output textRendererOutput, MetadataRenderer.Output metadataRendererOutput) {
+      AudioRendererEventListener audioRendererEventListener, TextRenderer.Output textRendererOutput,
+      MetadataRenderer.Output metadataRendererOutput) {
     ArrayList<Renderer> renderersList = new ArrayList<>();
     buildVideoRenderers(context, drmSessionManager, allowedVideoJoiningTimeMs,
         eventHandler, videoRendererEventListener, extensionRendererMode, renderersList);
@@ -166,9 +166,10 @@ public class DefaultRenderersFactory implements RenderersFactory {
    * @param out An array to which the built renderers should be appended.
    */
   protected void buildVideoRenderers(Context context,
-      DrmSessionManager<FrameworkMediaCrypto> drmSessionManager, long allowedVideoJoiningTimeMs,
-      Handler eventHandler, VideoRendererEventListener eventListener,
-      @ExtensionRendererMode int extensionRendererMode, ArrayList<Renderer> out) {
+      @Nullable DrmSessionManager<FrameworkMediaCrypto> drmSessionManager,
+      long allowedVideoJoiningTimeMs, Handler eventHandler,
+      VideoRendererEventListener eventListener, @ExtensionRendererMode int extensionRendererMode,
+      ArrayList<Renderer> out) {
     out.add(new MediaCodecVideoRenderer(context, MediaCodecSelector.DEFAULT,
         allowedVideoJoiningTimeMs, drmSessionManager, false, eventHandler, eventListener,
         MAX_DROPPED_VIDEO_FRAME_COUNT_TO_NOTIFY));
@@ -211,7 +212,7 @@ public class DefaultRenderersFactory implements RenderersFactory {
    * @param out An array to which the built renderers should be appended.
    */
   protected void buildAudioRenderers(Context context,
-      DrmSessionManager<FrameworkMediaCrypto> drmSessionManager,
+      @Nullable DrmSessionManager<FrameworkMediaCrypto> drmSessionManager,
       AudioProcessor[] audioProcessors, Handler eventHandler,
       AudioRendererEventListener eventListener, @ExtensionRendererMode int extensionRendererMode,
       ArrayList<Renderer> out) {

library/core/src/main/java/com/google/android/exoplayer2/ExoPlayerFactory.java

@@ -16,6 +16,7 @@
 package com.google.android.exoplayer2;
 
 import android.content.Context;
+import android.support.annotation.Nullable;
 import com.google.android.exoplayer2.drm.DrmSessionManager;
 import com.google.android.exoplayer2.drm.FrameworkMediaCrypto;
 import com.google.android.exoplayer2.trackselection.TrackSelector;
@@ -54,7 +55,8 @@ public final class ExoPlayerFactory {
    */
   @Deprecated
   public static SimpleExoPlayer newSimpleInstance(Context context, TrackSelector trackSelector,
-      LoadControl loadControl, DrmSessionManager<FrameworkMediaCrypto> drmSessionManager) {
+      LoadControl loadControl,
+      @Nullable DrmSessionManager<FrameworkMediaCrypto> drmSessionManager) {
     RenderersFactory renderersFactory = new DefaultRenderersFactory(context, drmSessionManager);
     return newSimpleInstance(renderersFactory, trackSelector, loadControl);
   }
@@ -74,7 +76,7 @@ public final class ExoPlayerFactory {
    */
   @Deprecated
   public static SimpleExoPlayer newSimpleInstance(Context context, TrackSelector trackSelector,
-      LoadControl loadControl, DrmSessionManager<FrameworkMediaCrypto> drmSessionManager,
+      LoadControl loadControl, @Nullable DrmSessionManager<FrameworkMediaCrypto> drmSessionManager,
       @DefaultRenderersFactory.ExtensionRendererMode int extensionRendererMode) {
     RenderersFactory renderersFactory = new DefaultRenderersFactory(context, drmSessionManager,
         extensionRendererMode);
@@ -98,7 +100,7 @@ public final class ExoPlayerFactory {
    */
   @Deprecated
   public static SimpleExoPlayer newSimpleInstance(Context context, TrackSelector trackSelector,
-      LoadControl loadControl, DrmSessionManager<FrameworkMediaCrypto> drmSessionManager,
+      LoadControl loadControl, @Nullable DrmSessionManager<FrameworkMediaCrypto> drmSessionManager,
       @DefaultRenderersFactory.ExtensionRendererMode int extensionRendererMode,
       long allowedVideoJoiningTimeMs) {
     RenderersFactory renderersFactory = new DefaultRenderersFactory(context, drmSessionManager,

library/core/src/main/java/com/google/android/exoplayer2/audio/AudioRendererEventListener.java

@@ -17,6 +17,7 @@ package com.google.android.exoplayer2.audio;
 
 import android.os.Handler;
 import android.os.SystemClock;
+import android.support.annotation.Nullable;
 import com.google.android.exoplayer2.C;
 import com.google.android.exoplayer2.Format;
 import com.google.android.exoplayer2.Renderer;
@@ -84,15 +85,16 @@ public interface AudioRendererEventListener {
    */
   final class EventDispatcher {
 
-    private final Handler handler;
-    private final AudioRendererEventListener listener;
+    @Nullable private final Handler handler;
+    @Nullable private final AudioRendererEventListener listener;
 
     /**
      * @param handler A handler for dispatching events, or null if creating a dummy instance.
      * @param listener The listener to which events should be dispatched, or null if creating a
      *     dummy instance.
      */
-    public EventDispatcher(Handler handler, AudioRendererEventListener listener) {
+    public EventDispatcher(@Nullable Handler handler,
+        @Nullable AudioRendererEventListener listener) {
       this.handler = listener != null ? Assertions.checkNotNull(handler) : null;
       this.listener = listener;
     }

library/core/src/main/java/com/google/android/exoplayer2/audio/AudioTrack.java

@@ -22,6 +22,7 @@ import android.media.AudioManager;
 import android.media.AudioTimestamp;
 import android.os.ConditionVariable;
 import android.os.SystemClock;
+import android.support.annotation.Nullable;
 import android.util.Log;
 import com.google.android.exoplayer2.C;
 import com.google.android.exoplayer2.PlaybackParameters;
@@ -277,7 +278,7 @@ public final class AudioTrack {
    */
   public static boolean failOnSpuriousAudioTimestamp = false;
 
-  private final AudioCapabilities audioCapabilities;
+  @Nullable private final AudioCapabilities audioCapabilities;
   private final ChannelMappingAudioProcessor channelMappingAudioProcessor;
   private final SonicAudioProcessor sonicAudioProcessor;
   private final AudioProcessor[] availableAudioProcessors;
@@ -355,7 +356,7 @@ public final class AudioTrack {
    *     output. May be empty.
    * @param listener Listener for audio track events.
    */
-  public AudioTrack(AudioCapabilities audioCapabilities, AudioProcessor[] audioProcessors,
+  public AudioTrack(@Nullable AudioCapabilities audioCapabilities, AudioProcessor[] audioProcessors,
       Listener listener) {
     this.audioCapabilities = audioCapabilities;
     this.listener = listener;

library/core/src/main/java/com/google/android/exoplayer2/audio/MediaCodecAudioRenderer.java

@@ -21,6 +21,7 @@ import android.media.MediaCrypto;
 import android.media.MediaFormat;
 import android.media.audiofx.Virtualizer;
 import android.os.Handler;
+import android.support.annotation.Nullable;
 import com.google.android.exoplayer2.C;
 import com.google.android.exoplayer2.ExoPlaybackException;
 import com.google.android.exoplayer2.Format;
@@ -72,7 +73,7 @@ public class MediaCodecAudioRenderer extends MediaCodecRenderer implements Media
    *     has obtained the keys necessary to decrypt encrypted regions of the media.
    */
   public MediaCodecAudioRenderer(MediaCodecSelector mediaCodecSelector,
-      DrmSessionManager<FrameworkMediaCrypto> drmSessionManager,
+      @Nullable DrmSessionManager<FrameworkMediaCrypto> drmSessionManager,
       boolean playClearSamplesWithoutKeys) {
     this(mediaCodecSelector, drmSessionManager, playClearSamplesWithoutKeys, null, null);
   }
@@ -83,8 +84,8 @@ public class MediaCodecAudioRenderer extends MediaCodecRenderer implements Media
    *     null if delivery of events is not required.
    * @param eventListener A listener of events. May be null if delivery of events is not required.
    */
-  public MediaCodecAudioRenderer(MediaCodecSelector mediaCodecSelector, Handler eventHandler,
-      AudioRendererEventListener eventListener) {
+  public MediaCodecAudioRenderer(MediaCodecSelector mediaCodecSelector,
+      @Nullable Handler eventHandler, @Nullable AudioRendererEventListener eventListener) {
     this(mediaCodecSelector, null, true, eventHandler, eventListener);
   }
 
@@ -102,9 +103,9 @@ public class MediaCodecAudioRenderer extends MediaCodecRenderer implements Media
    * @param eventListener A listener of events. May be null if delivery of events is not required.
    */
   public MediaCodecAudioRenderer(MediaCodecSelector mediaCodecSelector,
-      DrmSessionManager<FrameworkMediaCrypto> drmSessionManager,
-      boolean playClearSamplesWithoutKeys, Handler eventHandler,
-      AudioRendererEventListener eventListener) {
+      @Nullable DrmSessionManager<FrameworkMediaCrypto> drmSessionManager,
+      boolean playClearSamplesWithoutKeys, @Nullable Handler eventHandler,
+      @Nullable AudioRendererEventListener eventListener) {
     this(mediaCodecSelector, drmSessionManager, playClearSamplesWithoutKeys, eventHandler,
         eventListener, null);
   }
@@ -127,10 +128,10 @@ public class MediaCodecAudioRenderer extends MediaCodecRenderer implements Media
    *     output.
    */
   public MediaCodecAudioRenderer(MediaCodecSelector mediaCodecSelector,
-      DrmSessionManager<FrameworkMediaCrypto> drmSessionManager,
-      boolean playClearSamplesWithoutKeys, Handler eventHandler,
-      AudioRendererEventListener eventListener, AudioCapabilities audioCapabilities,
-      AudioProcessor... audioProcessors) {
+      @Nullable DrmSessionManager<FrameworkMediaCrypto> drmSessionManager,
+      boolean playClearSamplesWithoutKeys, @Nullable Handler eventHandler,
+      @Nullable AudioRendererEventListener eventListener,
+      @Nullable AudioCapabilities audioCapabilities, AudioProcessor... audioProcessors) {
     super(C.TRACK_TYPE_AUDIO, mediaCodecSelector, drmSessionManager, playClearSamplesWithoutKeys);
     audioTrack = new AudioTrack(audioCapabilities, audioProcessors, new AudioTrackListener());
     eventDispatcher = new EventDispatcher(eventHandler, eventListener);

library/core/src/main/java/com/google/android/exoplayer2/mediacodec/MediaCodecRenderer.java

@@ -169,7 +169,7 @@ public abstract class MediaCodecRenderer extends BaseRenderer {
   private static final int ADAPTATION_WORKAROUND_SLICE_WIDTH_HEIGHT = 32;
 
   private final MediaCodecSelector mediaCodecSelector;
-  private final DrmSessionManager<FrameworkMediaCrypto> drmSessionManager;
+  @Nullable private final DrmSessionManager<FrameworkMediaCrypto> drmSessionManager;
   private final boolean playClearSamplesWithoutKeys;
   private final DecoderInputBuffer buffer;
   private final DecoderInputBuffer flagsOnlyBuffer;
@@ -223,7 +223,7 @@ public abstract class MediaCodecRenderer extends BaseRenderer {
    *     has obtained the keys necessary to decrypt encrypted regions of the media.
    */
   public MediaCodecRenderer(int trackType, MediaCodecSelector mediaCodecSelector,
-      DrmSessionManager<FrameworkMediaCrypto> drmSessionManager,
+      @Nullable DrmSessionManager<FrameworkMediaCrypto> drmSessionManager,
       boolean playClearSamplesWithoutKeys) {
     super(trackType);
     Assertions.checkState(Util.SDK_INT >= 16);
@@ -1090,7 +1090,7 @@ public abstract class MediaCodecRenderer extends BaseRenderer {
    * @param drmInitData {@link DrmInitData} of the format to check for support.
    * @return Whether the encryption scheme is supported, or true if {@code drmInitData} is null.
    */
-  private static boolean isDrmSchemeSupported(DrmSessionManager drmSessionManager,
+  private static boolean isDrmSchemeSupported(@Nullable DrmSessionManager drmSessionManager,
       @Nullable DrmInitData drmInitData) {
     if (drmInitData == null) {
       // Content is unencrypted.

library/core/src/main/java/com/google/android/exoplayer2/video/MediaCodecVideoRenderer.java

@@ -26,6 +26,7 @@ import android.media.MediaFormat;
 import android.os.Handler;
 import android.os.SystemClock;
 import android.support.annotation.NonNull;
+import android.support.annotation.Nullable;
 import android.util.Log;
 import android.view.Surface;
 import com.google.android.exoplayer2.C;
@@ -137,8 +138,8 @@ public class MediaCodecVideoRenderer extends MediaCodecRenderer {
    *     invocations of {@link VideoRendererEventListener#onDroppedFrames(int, long)}.
    */
   public MediaCodecVideoRenderer(Context context, MediaCodecSelector mediaCodecSelector,
-      long allowedJoiningTimeMs, Handler eventHandler, VideoRendererEventListener eventListener,
-      int maxDroppedFrameCountToNotify) {
+      long allowedJoiningTimeMs, @Nullable Handler eventHandler,
+      @Nullable VideoRendererEventListener eventListener, int maxDroppedFrameCountToNotify) {
     this(context, mediaCodecSelector, allowedJoiningTimeMs, null, false, eventHandler,
         eventListener, maxDroppedFrameCountToNotify);
   }
@@ -162,9 +163,10 @@ public class MediaCodecVideoRenderer extends MediaCodecRenderer {
    *     invocations of {@link VideoRendererEventListener#onDroppedFrames(int, long)}.
    */
   public MediaCodecVideoRenderer(Context context, MediaCodecSelector mediaCodecSelector,
-      long allowedJoiningTimeMs, DrmSessionManager<FrameworkMediaCrypto> drmSessionManager,
-      boolean playClearSamplesWithoutKeys, Handler eventHandler,
-      VideoRendererEventListener eventListener, int maxDroppedFramesToNotify) {
+      long allowedJoiningTimeMs,
+      @Nullable DrmSessionManager<FrameworkMediaCrypto> drmSessionManager,
+      boolean playClearSamplesWithoutKeys, @Nullable Handler eventHandler,
+      @Nullable VideoRendererEventListener eventListener, int maxDroppedFramesToNotify) {
     super(C.TRACK_TYPE_VIDEO, mediaCodecSelector, drmSessionManager, playClearSamplesWithoutKeys);
     this.allowedJoiningTimeMs = allowedJoiningTimeMs;
     this.maxDroppedFramesToNotify = maxDroppedFramesToNotify;

library/core/src/main/java/com/google/android/exoplayer2/video/VideoRendererEventListener.java

@@ -17,6 +17,7 @@ package com.google.android.exoplayer2.video;
 
 import android.os.Handler;
 import android.os.SystemClock;
+import android.support.annotation.Nullable;
 import android.view.Surface;
 import android.view.TextureView;
 import com.google.android.exoplayer2.Format;
@@ -109,15 +110,16 @@ public interface VideoRendererEventListener {
    */
   final class EventDispatcher {
 
-    private final Handler handler;
-    private final VideoRendererEventListener listener;
+    @Nullable private final Handler handler;
+    @Nullable private final VideoRendererEventListener listener;
 
     /**
      * @param handler A handler for dispatching events, or null if creating a dummy instance.
      * @param listener The listener to which events should be dispatched, or null if creating a
      *     dummy instance.
      */
-    public EventDispatcher(Handler handler, VideoRendererEventListener listener) {
+    public EventDispatcher(@Nullable Handler handler,
+        @Nullable VideoRendererEventListener listener) {
       this.handler = listener != null ? Assertions.checkNotNull(handler) : null;
       this.listener = listener;
     }