content: /*
   * Copyright (C) 2016 The Android Open Source Project
   *
   * Licensed under the Apache License, Version 2.0 (the "License");
   * you may not use this file except in compliance with the License.
   * You may obtain a copy of the License at
   *
   *      http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  package com.google.android.exoplayer2.extractor;
  
  import static java.lang.Math.min;
  
  import androidx.annotation.Nullable;
  import com.google.android.exoplayer2.C;
  import com.google.android.exoplayer2.Format;
  import com.google.android.exoplayer2.upstream.DataReader;
  import com.google.android.exoplayer2.util.ParsableByteArray;
  import java.io.EOFException;
  import java.io.IOException;
  
  /** A fake {@link TrackOutput} implementation. */
  public final class DummyTrackOutput implements TrackOutput {
  
    // Even though read data is discarded, data source implementations could be making use of the
    // buffer contents. For example, caches. So we cannot use a static field for this which could be
    // shared between different threads.
    private final byte[] readBuffer;
  
    public DummyTrackOutput() {
      readBuffer = new byte[4096];
    }
  
    @Override
    public void format(Format format) {
      // Do nothing.
    }
  
    @Override
    public int sampleData(
        DataReader input, int length, boolean allowEndOfInput, @SampleDataPart int sampleDataPart)
        throws IOException {
      int bytesToSkipByReading = min(readBuffer.length, length);
      int bytesSkipped = input.read(readBuffer, /* offset= */ 0, bytesToSkipByReading);
      if (bytesSkipped == C.RESULT_END_OF_INPUT) {
        if (allowEndOfInput) {
          return C.RESULT_END_OF_INPUT;
        }
        throw new EOFException();
      }
      return bytesSkipped;
    }
  
    @Override
    public void sampleData(ParsableByteArray data, int length, @SampleDataPart int sampleDataPart) {
      data.skipBytes(length);
    }
  
    @Override
    public void sampleMetadata(
        long timeUs,
        @C.BufferFlags int flags,
        int size,
        int offset,
        @Nullable CryptoData cryptoData) {
      // Do nothing.
    }
  }
  