content: /*
   * Copyright (C) 2020 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;
  
  import com.google.android.exoplayer2.MediaItem.LiveConfiguration;
  
  /**
   * Controls the playback speed while playing live content in order to maintain a steady target live
   * offset.
   */
  public interface LivePlaybackSpeedControl {
  
    /**
     * Sets the live configuration defined by the media.
     *
     * @param liveConfiguration The {@link LiveConfiguration} as defined by the media.
     */
    void setLiveConfiguration(LiveConfiguration liveConfiguration);
  
    /**
     * Sets the target live offset in microseconds that overrides the live offset {@link
     * #setLiveConfiguration configured} by the media. Passing {@code C.TIME_UNSET} deletes a previous
     * override.
     *
     * <p>If no target live offset is configured by {@link #setLiveConfiguration}, this override has
     * no effect.
     */
    void setTargetLiveOffsetOverrideUs(long liveOffsetUs);
  
    /**
     * Notifies the live playback speed control that a rebuffer occurred.
     *
     * <p>A rebuffer is defined to be caused by buffer depletion rather than a user action. Hence this
     * method is not called during initial buffering or when buffering as a result of a seek
     * operation.
     */
    void notifyRebuffer();
  
    /**
     * Returns the adjusted playback speed in order get closer towards the {@link
     * #getTargetLiveOffsetUs() target live offset}.
     *
     * @param liveOffsetUs The current live offset, in microseconds.
     * @param bufferedDurationUs The duration of media that's currently buffered, in microseconds.
     * @return The adjusted factor by which playback should be sped up.
     */
    float getAdjustedPlaybackSpeed(long liveOffsetUs, long bufferedDurationUs);
  
    /**
     * Returns the current target live offset, in microseconds, or {@link C#TIME_UNSET} if no target
     * live offset is defined for the current media.
     */
    long getTargetLiveOffsetUs();
  }
  