content: /*
   * Copyright (C) 2019 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.mp3;
  
  import com.google.android.exoplayer2.C;
  import com.google.android.exoplayer2.extractor.SeekMap;
  
  /**
   * {@link SeekMap} that provides the end position of audio data and also allows mapping from
   * position (byte offset) back to time, which can be used to work out the new sample basis timestamp
   * after seeking and resynchronization.
   */
  /* package */ interface Seeker extends SeekMap {
  
    /**
     * Maps a position (byte offset) to a corresponding sample timestamp.
     *
     * @param position A seek position (byte offset) relative to the start of the stream.
     * @return The corresponding timestamp of the next sample to be read, in microseconds.
     */
    long getTimeUs(long position);
  
    /**
     * Returns the position (byte offset) in the stream that is immediately after audio data, or
     * {@link C#POSITION_UNSET} if not known.
     */
    long getDataEndPosition();
  
    /** A {@link Seeker} that does not support seeking through audio data. */
    /* package */ class UnseekableSeeker extends SeekMap.Unseekable implements Seeker {
  
      public UnseekableSeeker() {
        super(/* durationUs= */ C.TIME_UNSET);
      }
  
      @Override
      public long getTimeUs(long position) {
        return 0;
      }
  
      @Override
      public long getDataEndPosition() {
        // Position unset as we do not know the data end position. Note that returning 0 doesn't work.
        return C.POSITION_UNSET;
      }
    }
  }
  