Add nullness annotations on MediaCodecRenderer processOutputBuffer

Issue: #7579
PiperOrigin-RevId: 322756102

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

@@ -15,6 +15,8 @@
  */
 package com.google.android.exoplayer2.audio;
 
+import static com.google.android.exoplayer2.util.Assertions.checkNotNull;
+
 import android.annotation.SuppressLint;
 import android.content.Context;
 import android.media.MediaCodec;
@@ -40,7 +42,6 @@ import com.google.android.exoplayer2.mediacodec.MediaCodecSelector;
 import com.google.android.exoplayer2.mediacodec.MediaCodecUtil;
 import com.google.android.exoplayer2.mediacodec.MediaCodecUtil.DecoderQueryException;
 import com.google.android.exoplayer2.mediacodec.MediaFormatUtil;
-import com.google.android.exoplayer2.util.Assertions;
 import com.google.android.exoplayer2.util.MediaClock;
 import com.google.android.exoplayer2.util.MimeTypes;
 import com.google.android.exoplayer2.util.Util;
@@ -568,7 +569,7 @@ public class MediaCodecAudioRenderer extends MediaCodecRenderer implements Media
       long positionUs,
       long elapsedRealtimeUs,
       @Nullable MediaCodec codec,
-      ByteBuffer buffer,
+      @Nullable ByteBuffer buffer,
       int bufferIndex,
       int bufferFlags,
       int sampleCount,
@@ -577,6 +578,7 @@ public class MediaCodecAudioRenderer extends MediaCodecRenderer implements Media
       boolean isLastBuffer,
       Format format)
       throws ExoPlaybackException {
+    checkNotNull(buffer);
     if (codec != null
         && codecNeedsEosBufferTimestampWorkaround
         && bufferPresentationTimeUs == 0
@@ -588,7 +590,7 @@ public class MediaCodecAudioRenderer extends MediaCodecRenderer implements Media
     if (codecPassthroughFormat != null
         && (bufferFlags & MediaCodec.BUFFER_FLAG_CODEC_CONFIG) != 0) {
       // Discard output buffers from the passthrough (raw) decoder containing codec specific data.
-      Assertions.checkNotNull(codec).releaseOutputBuffer(bufferIndex, false);
+      checkNotNull(codec).releaseOutputBuffer(bufferIndex, false);
       return true;
     }
 

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

@@ -387,7 +387,7 @@ public abstract class MediaCodecRenderer extends BaseRenderer {
   private long codecHotswapDeadlineMs;
   private int inputIndex;
   private int outputIndex;
-  private ByteBuffer outputBuffer;
+  @Nullable private ByteBuffer outputBuffer;
   private boolean isDecodeOnlyOutputBuffer;
   private boolean isLastOutputBuffer;
   private boolean bypassEnabled;
@@ -1168,6 +1168,7 @@ public abstract class MediaCodecRenderer extends BaseRenderer {
     }
   }
 
+  @Nullable
   private ByteBuffer getOutputBuffer(int outputIndex) {
     if (Util.SDK_INT >= 21) {
       return codec.getOutputBuffer(outputIndex);
@@ -1874,7 +1875,10 @@ public abstract class MediaCodecRenderer extends BaseRenderer {
    * @param elapsedRealtimeUs {@link SystemClock#elapsedRealtime()} in microseconds, measured at the
    *     start of the current iteration of the rendering loop.
    * @param codec The {@link MediaCodec} instance, or null in bypass mode were no codec is used.
-   * @param buffer The output buffer to process.
+   * @param buffer The output buffer to process, or null if the buffer data is not made available to
+   *     the application layer (see {@link MediaCodec#getOutputBuffer(int)}). This {@code buffer}
+   *     can only be null for video data. Note that the buffer data can still be rendered in this
+   *     case by using the {@code bufferIndex}.
    * @param bufferIndex The index of the output buffer.
    * @param bufferFlags The flags attached to the output buffer.
    * @param sampleCount The number of samples extracted from the sample queue in the buffer. This
@@ -1891,7 +1895,7 @@ public abstract class MediaCodecRenderer extends BaseRenderer {
       long positionUs,
       long elapsedRealtimeUs,
       @Nullable MediaCodec codec,
-      ByteBuffer buffer,
+      @Nullable ByteBuffer buffer,
       int bufferIndex,
       int bufferFlags,
       int sampleCount,

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

@@ -759,7 +759,7 @@ public class MediaCodecVideoRenderer extends MediaCodecRenderer {
       long positionUs,
       long elapsedRealtimeUs,
       @Nullable MediaCodec codec,
-      ByteBuffer buffer,
+      @Nullable ByteBuffer buffer,
       int bufferIndex,
       int bufferFlags,
       int sampleCount,