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.text;
  
  import com.google.android.exoplayer2.C;
  import com.google.android.exoplayer2.decoder.SimpleDecoder;
  import java.nio.ByteBuffer;
  
  /**
   * Base class for subtitle parsers that use their own decode thread.
   */
  public abstract class SimpleSubtitleDecoder extends
      SimpleDecoder<SubtitleInputBuffer, SubtitleOutputBuffer, SubtitleDecoderException> implements
      SubtitleDecoder {
  
    private final String name;
  
    /**
     * @param name The name of the decoder.
     */
    protected SimpleSubtitleDecoder(String name) {
      super(new SubtitleInputBuffer[2], new SubtitleOutputBuffer[2]);
      this.name = name;
      setInitialInputBufferSize(1024);
    }
  
    @Override
    public final String getName() {
      return name;
    }
  
    @Override
    public void setPositionUs(long timeUs) {
      // Do nothing
    }
  
    @Override
    protected final SubtitleInputBuffer createInputBuffer() {
      return new SubtitleInputBuffer();
    }
  
    @Override
    protected final SubtitleOutputBuffer createOutputBuffer() {
      return new SimpleSubtitleOutputBuffer(this);
    }
  
    @Override
    protected final SubtitleDecoderException createUnexpectedDecodeException(Throwable error) {
      return new SubtitleDecoderException("Unexpected decode error", error);
    }
  
    @Override
    protected final void releaseOutputBuffer(SubtitleOutputBuffer buffer) {
      super.releaseOutputBuffer(buffer);
    }
  
    @Override
    protected final SubtitleDecoderException decode(SubtitleInputBuffer inputBuffer,
        SubtitleOutputBuffer outputBuffer, boolean reset) {
      try {
        ByteBuffer inputData = inputBuffer.data;
        Subtitle subtitle = decode(inputData.array(), inputData.limit(), reset);
        outputBuffer.setContent(inputBuffer.timeUs, subtitle, inputBuffer.subsampleOffsetUs);
        // Clear BUFFER_FLAG_DECODE_ONLY (see [Internal: b/27893809]).
        outputBuffer.clearFlag(C.BUFFER_FLAG_DECODE_ONLY);
        return null;
      } catch (SubtitleDecoderException e) {
        return e;
      }
    }
  
    /**
     * Decodes data into a {@link Subtitle}.
     *
     * @param data An array holding the data to be decoded, starting at position 0.
     * @param size The size of the data to be decoded.
     * @param reset Whether the decoder must be reset before decoding.
     * @return The decoded {@link Subtitle}.
     * @throws SubtitleDecoderException If a decoding error occurs.
     */
    protected abstract Subtitle decode(byte[] data, int size, boolean reset)
        throws SubtitleDecoderException;
  
  }
  