content: /*
   * Copyright (C) 2018 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.audio;
  
  import android.media.AudioTrack;
  import android.media.audiofx.AudioEffect;
  import androidx.annotation.Nullable;
  
  /**
   * Represents auxiliary effect information, which can be used to attach an auxiliary effect to an
   * underlying {@link AudioTrack}.
   *
   * <p>Auxiliary effects can only be applied if the application has the {@code
   * android.permission.MODIFY_AUDIO_SETTINGS} permission. Apps are responsible for retaining the
   * associated audio effect instance and releasing it when it's no longer needed. See the
   * documentation of {@link AudioEffect} for more information.
   */
  public final class AuxEffectInfo {
  
    /** Value for {@link #effectId} representing no auxiliary effect. */
    public static final int NO_AUX_EFFECT_ID = 0;
  
    /**
     * The identifier of the effect, or {@link #NO_AUX_EFFECT_ID} if there is no effect.
     *
     * @see android.media.AudioTrack#attachAuxEffect(int)
     */
    public final int effectId;
    /**
     * The send level for the effect.
     *
     * @see android.media.AudioTrack#setAuxEffectSendLevel(float)
     */
    public final float sendLevel;
  
    /**
     * Creates an instance with the given effect identifier and send level.
     *
     * @param effectId The effect identifier. This is the value returned by {@link
     *     AudioEffect#getId()} on the effect, or {@link #NO_AUX_EFFECT_ID} which represents no
     *     effect. This value is passed to {@link AudioTrack#attachAuxEffect(int)} on the underlying
     *     audio track.
     * @param sendLevel The send level for the effect, where 0 represents no effect and a value of 1
     *     is full send. If {@code effectId} is not {@link #NO_AUX_EFFECT_ID}, this value is passed to
     *     {@link AudioTrack#setAuxEffectSendLevel(float)} on the underlying audio track.
     */
    public AuxEffectInfo(int effectId, float sendLevel) {
      this.effectId = effectId;
      this.sendLevel = sendLevel;
    }
  
    @Override
    public boolean equals(@Nullable Object o) {
      if (this == o) {
        return true;
      }
      if (o == null || getClass() != o.getClass()) {
        return false;
      }
      AuxEffectInfo auxEffectInfo = (AuxEffectInfo) o;
      return effectId == auxEffectInfo.effectId
          && Float.compare(auxEffectInfo.sendLevel, sendLevel) == 0;
    }
  
    @Override
    public int hashCode() {
      int result = 17;
      result = 31 * result + effectId;
      result = 31 * result + Float.floatToIntBits(sendLevel);
      return result;
    }
  }
  