Use specific error code for exceptions during encoding/decoding.

After this change exceptions throw by MediaCodec during
encoding/decoding will result in TransformationExceptions with
ERROR_CODE_ENCODING_FAILED/ERROR_CODE_DECODING_FAILED.
Before this change ERROR_CODE_FAILED_RUNTIME_CHECK was used.

PiperOrigin-RevId: 421560396

library/transformer/src/main/java/com/google/android/exoplayer2/transformer/AudioSamplePipeline.java

@@ -113,17 +113,17 @@ import java.nio.ByteBuffer;
 
   @Override
   @Nullable
-  public DecoderInputBuffer dequeueInputBuffer() {
+  public DecoderInputBuffer dequeueInputBuffer() throws TransformationException {
     return decoder.maybeDequeueInputBuffer(decoderInputBuffer) ? decoderInputBuffer : null;
   }
 
   @Override
-  public void queueInputBuffer() {
+  public void queueInputBuffer() throws TransformationException {
     decoder.queueInputBuffer(decoderInputBuffer);
   }
 
   @Override
-  public boolean processData() {
+  public boolean processData() throws TransformationException {
     if (sonicAudioProcessor.isActive()) {
       return feedEncoderFromSonic() || feedSonicFromDecoder();
     } else {
@@ -133,13 +133,13 @@ import java.nio.ByteBuffer;
 
   @Override
   @Nullable
-  public Format getOutputFormat() {
+  public Format getOutputFormat() throws TransformationException {
     return encoder != null ? encoder.getOutputFormat() : null;
   }
 
   @Override
   @Nullable
-  public DecoderInputBuffer getOutputBuffer() {
+  public DecoderInputBuffer getOutputBuffer() throws TransformationException {
     if (encoder != null) {
       encoderOutputBuffer.data = encoder.getOutputBuffer();
       if (encoderOutputBuffer.data != null) {
@@ -152,7 +152,7 @@ import java.nio.ByteBuffer;
   }
 
   @Override
-  public void releaseOutputBuffer() {
+  public void releaseOutputBuffer() throws TransformationException {
     checkStateNotNull(encoder).releaseOutputBuffer();
   }
 
@@ -174,7 +174,7 @@ import java.nio.ByteBuffer;
    * Attempts to pass decoder output data to the encoder, and returns whether it may be possible to
    * pass more data immediately by calling this method again.
    */
-  private boolean feedEncoderFromDecoder() {
+  private boolean feedEncoderFromDecoder() throws TransformationException {
     if (!encoder.maybeDequeueInputBuffer(encoderInputBuffer)) {
       return false;
     }
@@ -203,7 +203,7 @@ import java.nio.ByteBuffer;
    * Attempts to pass audio processor output data to the encoder, and returns whether it may be
    * possible to pass more data immediately by calling this method again.
    */
-  private boolean feedEncoderFromSonic() {
+  private boolean feedEncoderFromSonic() throws TransformationException {
     if (!encoder.maybeDequeueInputBuffer(encoderInputBuffer)) {
       return false;
     }
@@ -226,7 +226,7 @@ import java.nio.ByteBuffer;
    * Attempts to process decoder output data, and returns whether it may be possible to process more
    * data immediately by calling this method again.
    */
-  private boolean feedSonicFromDecoder() {
+  private boolean feedSonicFromDecoder() throws TransformationException {
     if (drainingSonicForSpeedChange) {
       if (sonicAudioProcessor.isEnded() && !sonicOutputBuffer.hasRemaining()) {
         flushSonicAndSetSpeed(currentSpeed);
@@ -267,7 +267,7 @@ import java.nio.ByteBuffer;
    * Feeds as much data as possible between the current position and limit of the specified {@link
    * ByteBuffer} to the encoder, and advances its position by the number of bytes fed.
    */
-  private void feedEncoder(ByteBuffer inputBuffer) {
+  private void feedEncoder(ByteBuffer inputBuffer) throws TransformationException {
     ByteBuffer encoderInputBufferData = checkNotNull(encoderInputBuffer.data);
     int bufferLimit = inputBuffer.limit();
     inputBuffer.limit(min(bufferLimit, inputBuffer.position() + encoderInputBufferData.capacity()));
@@ -283,7 +283,7 @@ import java.nio.ByteBuffer;
     encoder.queueInputBuffer(encoderInputBuffer);
   }
 
-  private void queueEndOfStreamToEncoder() {
+  private void queueEndOfStreamToEncoder() throws TransformationException {
     checkState(checkNotNull(encoderInputBuffer.data).position() == 0);
     encoderInputBuffer.timeUs = nextEncoderInputBufferTimeUs;
     encoderInputBuffer.addFlag(C.BUFFER_FLAG_END_OF_STREAM);

library/transformer/src/main/java/com/google/android/exoplayer2/transformer/Codec.java

@@ -107,6 +107,7 @@ public final class Codec {
 
   private final BufferInfo outputBufferInfo;
   private final MediaCodec mediaCodec;
+  private final Format configurationFormat;
   @Nullable private final Surface inputSurface;
 
   private @MonotonicNonNull Format outputFormat;
@@ -117,15 +118,36 @@ public final class Codec {
   private boolean inputStreamEnded;
   private boolean outputStreamEnded;
 
-  /** Creates a {@code Codec} from a configured and started {@link MediaCodec}. */
-  public Codec(MediaCodec mediaCodec, @Nullable Surface inputSurface) {
+  /**
+   * Creates a {@code Codec} from a configured and started {@link MediaCodec}.
+   *
+   * @param mediaCodec The configured and started {@link MediaCodec}.
+   * @param configurationFormat See {@link #getConfigurationFormat()}.
+   * @param inputSurface The input {@link Surface} if the {@link MediaCodec} receives input from a
+   *     surface.
+   */
+  public Codec(MediaCodec mediaCodec, Format configurationFormat, @Nullable Surface inputSurface) {
     this.mediaCodec = mediaCodec;
+    this.configurationFormat = configurationFormat;
     this.inputSurface = inputSurface;
     outputBufferInfo = new BufferInfo();
     inputBufferIndex = C.INDEX_UNSET;
     outputBufferIndex = C.INDEX_UNSET;
   }
 
+  /**
+   * Returns the {@link Format} used for configuring the codec.
+   *
+   * <p>The configuration {@link Format} is the input {@link Format} used by the {@link
+   * DecoderFactory} or output {@link Format} used by the {@link EncoderFactory} for selecting and
+   * configuring the underlying {@link MediaCodec}.
+   */
+  // TODO(b/214012830): Use this to check whether the Format passed to the factory and actual
+  // configuration format differ to see whether fallback was applied.
+  public Format getConfigurationFormat() {
+    return configurationFormat;
+  }
+
   /** Returns the input {@link Surface}, or null if the input is not a surface. */
   @Nullable
   public Surface getInputSurface() {
@@ -137,18 +159,28 @@ public final class Codec {
    *
    * @param inputBuffer The buffer where the dequeued buffer data is stored.
    * @return Whether an input buffer is ready to be used.
+   * @throws TransformationException If the underlying {@link MediaCodec} encounters a problem.
    */
   @EnsuresNonNullIf(expression = "#1.data", result = true)
-  public boolean maybeDequeueInputBuffer(DecoderInputBuffer inputBuffer) {
+  public boolean maybeDequeueInputBuffer(DecoderInputBuffer inputBuffer)
+      throws TransformationException {
     if (inputStreamEnded) {
       return false;
     }
     if (inputBufferIndex < 0) {
+      try {
         inputBufferIndex = mediaCodec.dequeueInputBuffer(/* timeoutUs= */ 0);
+      } catch (RuntimeException e) {
+        throw createTransformationException(e);
+      }
       if (inputBufferIndex < 0) {
         return false;
       }
+      try {
         inputBuffer.data = mediaCodec.getInputBuffer(inputBufferIndex);
+      } catch (RuntimeException e) {
+        throw createTransformationException(e);
+      }
       inputBuffer.clear();
     }
     checkNotNull(inputBuffer.data);
@@ -158,8 +190,13 @@ public final class Codec {
   /**
    * Queues an input buffer to the decoder. No buffers may be queued after an {@link
    * DecoderInputBuffer#isEndOfStream() end of stream} buffer has been queued.
+   *
+   * @param inputBuffer The {@link DecoderInputBuffer input buffer}.
+   * @throws IllegalStateException If called again after an {@link
+   *     DecoderInputBuffer#isEndOfStream() end of stream} buffer has been queued.
+   * @throws TransformationException If the underlying {@link MediaCodec} encounters a problem.
    */
-  public void queueInputBuffer(DecoderInputBuffer inputBuffer) {
+  public void queueInputBuffer(DecoderInputBuffer inputBuffer) throws TransformationException {
     checkState(
         !inputStreamEnded, "Input buffer can not be queued after the input stream has ended.");
 
@@ -174,32 +211,64 @@ public final class Codec {
       inputStreamEnded = true;
       flags = MediaCodec.BUFFER_FLAG_END_OF_STREAM;
     }
+    try {
       mediaCodec.queueInputBuffer(inputBufferIndex, offset, size, inputBuffer.timeUs, flags);
+    } catch (RuntimeException e) {
+      throw createTransformationException(e);
+    }
     inputBufferIndex = C.INDEX_UNSET;
     inputBuffer.data = null;
   }
 
-  public void signalEndOfInputStream() {
+  /**
+   * Signals end-of-stream on input to a video encoder.
+   *
+   * <p>This method does not need to be called for audio/video decoders or audio encoders. For these
+   * the {@link MediaCodec#BUFFER_FLAG_END_OF_STREAM} flag should be set on the last input buffer
+   * {@link #queueInputBuffer(DecoderInputBuffer) queued}.
+   *
+   * @throws IllegalStateException If the codec is not an encoder receiving input from a {@link
+   *     Surface}.
+   * @throws TransformationException If the underlying {@link MediaCodec} encounters a problem.
+   */
+  public void signalEndOfInputStream() throws TransformationException {
+    checkState(mediaCodec.getCodecInfo().isEncoder() && inputSurface != null);
+    try {
       mediaCodec.signalEndOfInputStream();
+    } catch (RuntimeException e) {
+      throw createTransformationException(e);
+    }
   }
 
-  /** Returns the current output format, if available. */
+  /**
+   * Returns the current output format, if available.
+   *
+   * @throws TransformationException If the underlying {@link MediaCodec} encounters a problem.
+   */
   @Nullable
-  public Format getOutputFormat() {
+  public Format getOutputFormat() throws TransformationException {
     // The format is updated when dequeueing a 'special' buffer index, so attempt to dequeue now.
     maybeDequeueOutputBuffer();
     return outputFormat;
   }
 
-  /** Returns the current output {@link ByteBuffer}, if available. */
+  /**
+   * Returns the current output {@link ByteBuffer}, if available.
+   *
+   * @throws TransformationException If the underlying {@link MediaCodec} encounters a problem.
+   */
   @Nullable
-  public ByteBuffer getOutputBuffer() {
+  public ByteBuffer getOutputBuffer() throws TransformationException {
     return maybeDequeueAndSetOutputBuffer() ? outputBuffer : null;
   }
 
-  /** Returns the {@link BufferInfo} associated with the current output buffer, if available. */
+  /**
+   * Returns the {@link BufferInfo} associated with the current output buffer, if available.
+   *
+   * @throws TransformationException If the underlying {@link MediaCodec} encounters a problem.
+   */
   @Nullable
-  public BufferInfo getOutputBufferInfo() {
+  public BufferInfo getOutputBufferInfo() throws TransformationException {
     return maybeDequeueOutputBuffer() ? outputBufferInfo : null;
   }
 
@@ -208,8 +277,10 @@ public final class Codec {
    *
    * <p>This should be called after the buffer has been processed. The next output buffer will not
    * be available until the previous has been released.
+   *
+   * @throws TransformationException If the underlying {@link MediaCodec} encounters a problem.
    */
-  public void releaseOutputBuffer() {
+  public void releaseOutputBuffer() throws TransformationException {
     releaseOutputBuffer(/* render= */ false);
   }
 
@@ -221,10 +292,17 @@ public final class Codec {
    *
    * <p>This should be called after the buffer has been processed. The next output buffer will not
    * be available until the previous has been released.
+   *
+   * @param render Whether the buffer needs to be sent to the output {@link Surface}.
+   * @throws TransformationException If the underlying {@link MediaCodec} encounters a problem.
    */
-  public void releaseOutputBuffer(boolean render) {
+  public void releaseOutputBuffer(boolean render) throws TransformationException {
     outputBuffer = null;
+    try {
       mediaCodec.releaseOutputBuffer(outputBufferIndex, render);
+    } catch (RuntimeException e) {
+      throw createTransformationException(e);
+    }
     outputBufferIndex = C.INDEX_UNSET;
   }
 
@@ -246,13 +324,18 @@ public final class Codec {
    * Tries obtaining an output buffer and sets {@link #outputBuffer} to the obtained output buffer.
    *
    * @return {@code true} if a buffer is successfully obtained, {@code false} otherwise.
+   * @throws TransformationException If the underlying {@link MediaCodec} encounters a problem.
    */
-  private boolean maybeDequeueAndSetOutputBuffer() {
+  private boolean maybeDequeueAndSetOutputBuffer() throws TransformationException {
     if (!maybeDequeueOutputBuffer()) {
       return false;
     }
 
+    try {
       outputBuffer = checkNotNull(mediaCodec.getOutputBuffer(outputBufferIndex));
+    } catch (RuntimeException e) {
+      throw createTransformationException(e);
+    }
     outputBuffer.position(outputBufferInfo.offset);
     outputBuffer.limit(outputBufferInfo.offset + outputBufferInfo.size);
     return true;
@@ -261,8 +344,10 @@ public final class Codec {
   /**
    * Returns true if there is already an output buffer pending. Otherwise attempts to dequeue an
    * output buffer and returns whether there is a new output buffer.
+   *
+   * @throws TransformationException If the underlying {@link MediaCodec} encounters a problem.
    */
-  private boolean maybeDequeueOutputBuffer() {
+  private boolean maybeDequeueOutputBuffer() throws TransformationException {
     if (outputBufferIndex >= 0) {
       return true;
     }
@@ -270,7 +355,11 @@ public final class Codec {
       return false;
     }
 
+    try {
       outputBufferIndex = mediaCodec.dequeueOutputBuffer(outputBufferInfo, /* timeoutUs= */ 0);
+    } catch (RuntimeException e) {
+      throw createTransformationException(e);
+    }
     if (outputBufferIndex < 0) {
       if (outputBufferIndex == MediaCodec.INFO_OUTPUT_FORMAT_CHANGED) {
         outputFormat = getFormat(mediaCodec.getOutputFormat());
@@ -292,6 +381,20 @@ public final class Codec {
     return true;
   }
 
+  private TransformationException createTransformationException(Exception cause) {
+    boolean isEncoder = mediaCodec.getCodecInfo().isEncoder();
+    boolean isVideo = MimeTypes.isVideo(configurationFormat.sampleMimeType);
+    String componentName = (isVideo ? "Video" : "Audio") + (isEncoder ? "Encoder" : "Decoder");
+    return TransformationException.createForCodec(
+        cause,
+        componentName,
+        configurationFormat,
+        mediaCodec.getName(),
+        isEncoder
+            ? TransformationException.ERROR_CODE_ENCODING_FAILED
+            : TransformationException.ERROR_CODE_DECODING_FAILED);
+  }
+
   private static Format getFormat(MediaFormat mediaFormat) {
     ImmutableList.Builder<byte[]> csdBuffers = new ImmutableList.Builder<>();
     int csdIndex = 0;

library/transformer/src/main/java/com/google/android/exoplayer2/transformer/DefaultCodecFactory.java

@@ -138,12 +138,14 @@ import org.checkerframework.checker.nullness.qual.RequiresNonNull;
       if (inputSurface != null) {
         inputSurface.release();
       }
+      @Nullable String mediaCodecName = null;
       if (mediaCodec != null) {
+        mediaCodecName = mediaCodec.getName();
         mediaCodec.release();
       }
-      throw createTransformationException(e, format, isVideo, isDecoder);
+      throw createTransformationException(e, format, isVideo, isDecoder, mediaCodecName);
     }
-    return new Codec(mediaCodec, inputSurface);
+    return new Codec(mediaCodec, format, inputSurface);
   }
 
   private static void configureCodec(
@@ -167,13 +169,18 @@ import org.checkerframework.checker.nullness.qual.RequiresNonNull;
   }
 
   private static TransformationException createTransformationException(
-      Exception cause, Format format, boolean isVideo, boolean isDecoder) {
+      Exception cause,
+      Format format,
+      boolean isVideo,
+      boolean isDecoder,
+      @Nullable String mediaCodecName) {
     String componentName = (isVideo ? "Video" : "Audio") + (isDecoder ? "Decoder" : "Encoder");
     if (cause instanceof IOException || cause instanceof MediaCodec.CodecException) {
       return TransformationException.createForCodec(
           cause,
           componentName,
           format,
+          mediaCodecName,
           isDecoder
               ? TransformationException.ERROR_CODE_DECODER_INIT_FAILED
               : TransformationException.ERROR_CODE_ENCODER_INIT_FAILED);
@@ -183,6 +190,7 @@ import org.checkerframework.checker.nullness.qual.RequiresNonNull;
           cause,
           componentName,
           format,
+          mediaCodecName,
           isDecoder
               ? TransformationException.ERROR_CODE_DECODING_FORMAT_UNSUPPORTED
               : TransformationException.ERROR_CODE_ENCODING_FORMAT_UNSUPPORTED);

library/transformer/src/main/java/com/google/android/exoplayer2/transformer/SamplePipeline.java

@@ -29,7 +29,7 @@ import com.google.android.exoplayer2.decoder.DecoderInputBuffer;
 
   /** Returns a buffer if the pipeline is ready to accept input, and {@code null} otherwise. */
   @Nullable
-  DecoderInputBuffer dequeueInputBuffer();
+  DecoderInputBuffer dequeueInputBuffer() throws TransformationException;
 
   /**
    * Informs the pipeline that its input buffer contains new input.
@@ -37,7 +37,7 @@ import com.google.android.exoplayer2.decoder.DecoderInputBuffer;
    * <p>Should be called after filling the input buffer from {@link #dequeueInputBuffer()} with new
    * input.
    */
-  void queueInputBuffer();
+  void queueInputBuffer() throws TransformationException;
 
   /**
    * Processes the input data and returns whether more data can be processed by calling this method
@@ -47,18 +47,18 @@ import com.google.android.exoplayer2.decoder.DecoderInputBuffer;
 
   /** Returns the output format of the pipeline if available, and {@code null} otherwise. */
   @Nullable
-  Format getOutputFormat();
+  Format getOutputFormat() throws TransformationException;
 
   /** Returns an output buffer if the pipeline has produced output, and {@code null} otherwise */
   @Nullable
-  DecoderInputBuffer getOutputBuffer();
+  DecoderInputBuffer getOutputBuffer() throws TransformationException;
 
   /**
    * Releases the pipeline's output buffer.
    *
    * <p>Should be called when the output buffer from {@link #getOutputBuffer()} is no longer needed.
    */
-  void releaseOutputBuffer();
+  void releaseOutputBuffer() throws TransformationException;
 
   /** Returns whether the pipeline has ended. */
   boolean isEnded();

library/transformer/src/main/java/com/google/android/exoplayer2/transformer/TransformationException.java

@@ -21,6 +21,7 @@ import static java.lang.annotation.ElementType.METHOD;
 import static java.lang.annotation.ElementType.PARAMETER;
 import static java.lang.annotation.ElementType.TYPE_USE;
 
+import android.media.MediaCodec;
 import android.os.SystemClock;
 import androidx.annotation.IntDef;
 import androidx.annotation.Nullable;
@@ -216,14 +217,25 @@ public final class TransformationException extends Exception {
    *
    * @param cause The cause of the failure.
    * @param componentName The name of the component used, e.g. 'VideoEncoder'.
-   * @param format The {@link Format} used for the decoder/encoder.
+   * @param configurationFormat The {@link Format} used for configuring the decoder/encoder.
+   * @param mediaCodecName The name of the {@link MediaCodec} used, if known.
    * @param errorCode See {@link #errorCode}.
    * @return The created instance.
    */
   public static TransformationException createForCodec(
-      Throwable cause, String componentName, Format format, int errorCode) {
+      Throwable cause,
+      String componentName,
+      Format configurationFormat,
+      @Nullable String mediaCodecName,
+      int errorCode) {
     return new TransformationException(
-        componentName + " error, format = " + format, cause, errorCode);
+        componentName
+            + " error, format = "
+            + configurationFormat
+            + ", mediaCodecName="
+            + mediaCodecName,
+        cause,
+        errorCode);
   }
 
   /**

library/transformer/src/main/java/com/google/android/exoplayer2/transformer/TransformerBaseRenderer.java

@@ -139,7 +139,8 @@ import org.checkerframework.checker.nullness.qual.RequiresNonNull;
   protected abstract boolean ensureConfigured() throws TransformationException;
 
   @RequiresNonNull({"samplePipeline", "#1.data"})
-  protected void maybeQueueSampleToPipeline(DecoderInputBuffer inputBuffer) {
+  protected void maybeQueueSampleToPipeline(DecoderInputBuffer inputBuffer)
+      throws TransformationException {
     samplePipeline.queueInputBuffer();
   }
 
@@ -147,9 +148,11 @@ import org.checkerframework.checker.nullness.qual.RequiresNonNull;
    * Attempts to write sample pipeline output data to the muxer.
    *
    * @return Whether it may be possible to write more data immediately by calling this method again.
+   * @throws Muxer.MuxerException If a muxing problem occurs.
+   * @throws TransformationException If a {@link SamplePipeline} problem occurs.
    */
   @RequiresNonNull("samplePipeline")
-  private boolean feedMuxerFromPipeline() throws Muxer.MuxerException {
+  private boolean feedMuxerFromPipeline() throws Muxer.MuxerException, TransformationException {
     if (!muxerWrapperTrackAdded) {
       @Nullable Format samplePipelineOutputFormat = samplePipeline.getOutputFormat();
       if (samplePipelineOutputFormat == null) {
@@ -185,9 +188,10 @@ import org.checkerframework.checker.nullness.qual.RequiresNonNull;
    * Attempts to read input data and pass the input data to the sample pipeline.
    *
    * @return Whether it may be possible to read more data immediately by calling this method again.
+   * @throws TransformationException If a {@link SamplePipeline} problem occurs.
    */
   @RequiresNonNull("samplePipeline")
-  private boolean feedPipelineFromInput() {
+  private boolean feedPipelineFromInput() throws TransformationException {
     @Nullable DecoderInputBuffer samplePipelineInputBuffer = samplePipeline.dequeueInputBuffer();
     if (samplePipelineInputBuffer == null) {
       return false;

library/transformer/src/main/java/com/google/android/exoplayer2/transformer/TransformerVideoRenderer.java

@@ -122,10 +122,14 @@ import org.checkerframework.checker.nullness.qual.RequiresNonNull;
   /**
    * Queues the input buffer to the sample pipeline unless it should be dropped because of slow
    * motion flattening.
+   *
+   * @param inputBuffer The {@link DecoderInputBuffer}.
+   * @throws TransformationException If a {@link SamplePipeline} problem occurs.
    */
   @Override
   @RequiresNonNull({"samplePipeline", "#1.data"})
-  protected void maybeQueueSampleToPipeline(DecoderInputBuffer inputBuffer) {
+  protected void maybeQueueSampleToPipeline(DecoderInputBuffer inputBuffer)
+      throws TransformationException {
     ByteBuffer data = inputBuffer.data;
     boolean shouldDropSample =
         sefSlowMotionFlattener != null && sefSlowMotionFlattener.dropOrTransformSample(inputBuffer);

library/transformer/src/main/java/com/google/android/exoplayer2/transformer/VideoSamplePipeline.java

@@ -131,12 +131,12 @@ import org.checkerframework.checker.nullness.qual.MonotonicNonNull;
 
   @Override
   @Nullable
-  public DecoderInputBuffer dequeueInputBuffer() {
+  public DecoderInputBuffer dequeueInputBuffer() throws TransformationException {
     return decoder.maybeDequeueInputBuffer(decoderInputBuffer) ? decoderInputBuffer : null;
   }
 
   @Override
-  public void queueInputBuffer() {
+  public void queueInputBuffer() throws TransformationException {
     decoder.queueInputBuffer(decoderInputBuffer);
   }
 
@@ -217,7 +217,7 @@ import org.checkerframework.checker.nullness.qual.MonotonicNonNull;
 
   @Override
   @Nullable
-  public Format getOutputFormat() {
+  public Format getOutputFormat() throws TransformationException {
     Format format = encoder.getOutputFormat();
     return format == null
         ? null
@@ -226,7 +226,7 @@ import org.checkerframework.checker.nullness.qual.MonotonicNonNull;
 
   @Override
   @Nullable
-  public DecoderInputBuffer getOutputBuffer() {
+  public DecoderInputBuffer getOutputBuffer() throws TransformationException {
     encoderOutputBuffer.data = encoder.getOutputBuffer();
     if (encoderOutputBuffer.data == null) {
       return null;
@@ -238,7 +238,7 @@ import org.checkerframework.checker.nullness.qual.MonotonicNonNull;
   }
 
   @Override
-  public void releaseOutputBuffer() {
+  public void releaseOutputBuffer() throws TransformationException {
     encoder.releaseOutputBuffer();
   }