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.ogg;
  
  import com.google.android.exoplayer2.extractor.ExtractorInput;
  import com.google.android.exoplayer2.extractor.SeekMap;
  import java.io.IOException;
  
  /**
   * Used to seek in an Ogg stream. OggSeeker implementation may do direct seeking or progressive
   * seeking. OggSeeker works together with a {@link SeekMap} instance to capture the queried position
   * and start the seeking with an initial estimated position.
   */
  /* package */ interface OggSeeker {
  
    /**
     * Returns a {@link SeekMap} that returns an initial estimated position for progressive seeking
     * or the final position for direct seeking. Returns null if {@link #read} has yet to return -1.
     */
    SeekMap createSeekMap();
  
    /**
     * Initializes a seek operation.
     *
     * @param timeUs The seek position in microseconds.
     * @return The granule position targeted by the seek.
     */
    long startSeek(long timeUs);
  
    /**
     * Reads data from the {@link ExtractorInput} to build the {@link SeekMap} or to continue a
     * progressive seek.
     * <p/>
     * If more data is required or if the position of the input needs to be modified then a position
     * from which data should be provided is returned. Else a negative value is returned. If a seek
     * has been completed then the value returned is -(currentGranule + 2). Else it is -1.
     *
     * @param input The {@link ExtractorInput} to read from.
     * @return A non-negative position to seek the {@link ExtractorInput} to, or -(currentGranule + 2)
     *     if the progressive seek has completed, or -1 otherwise.
     * @throws IOException If reading from the {@link ExtractorInput} fails.
     * @throws InterruptedException If the thread is interrupted.
     */
    long read(ExtractorInput input) throws IOException, InterruptedException;
  
  }
  