content: /*
   * Copyright 2017 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 android.media;
  
  import android.annotation.NonNull;
  import android.media.VolumeShaper.Configuration;
  
  /**
   * {@code VolumeAutomation} defines an interface for automatic volume control
   * of {@link AudioTrack} and {@link MediaPlayer} objects.
   */
  public interface VolumeAutomation {
      /**
       * Returns a {@link VolumeShaper} object that can be used modify the volume envelope
       * of the player or track.
       *
       * @param configuration the {@link VolumeShaper.Configuration configuration}
       *        that specifies the curve and duration to use.
       * @return a {@code VolumeShaper} object
       * @throws IllegalArgumentException if the {@code configuration} is not allowed by the player.
       * @throws IllegalStateException if too many {@code VolumeShaper}s are requested
       *         or the state of the player does not permit its creation (e.g. player is released).
       */
      public @NonNull VolumeShaper createVolumeShaper(
              @NonNull VolumeShaper.Configuration configuration);
  }
  