content: /*
   * Copyright (C) 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 com.google.android.exoplayer2.audio;
  
  import android.annotation.TargetApi;
  import com.google.android.exoplayer2.C;
  
  /**
   * Attributes for audio playback, which configure the underlying platform
   * {@link android.media.AudioTrack}.
   * <p>
   * To set the audio attributes, create an instance using the {@link Builder} and either pass it to
   * {@link com.google.android.exoplayer2.SimpleExoPlayer#setAudioAttributes(AudioAttributes)} or
   * send a message of type {@link C#MSG_SET_AUDIO_ATTRIBUTES} to the audio renderers.
   * <p>
   * This class is based on {@link android.media.AudioAttributes}, but can be used on all supported
   * API versions.
   */
  public final class AudioAttributes {
  
    public static final AudioAttributes DEFAULT = new Builder().build();
  
    /**
     * Builder for {@link AudioAttributes}.
     */
    public static final class Builder {
  
      @C.AudioContentType
      private int contentType;
      @C.AudioFlags
      private int flags;
      @C.AudioUsage
      private int usage;
  
      /**
       * Creates a new builder for {@link AudioAttributes}.
       * <p>
       * By default the content type is {@link C#CONTENT_TYPE_UNKNOWN}, usage is
       * {@link C#USAGE_MEDIA}, and no flags are set.
       */
      public Builder() {
        contentType = C.CONTENT_TYPE_UNKNOWN;
        flags = 0;
        usage = C.USAGE_MEDIA;
      }
  
      /**
       * @see android.media.AudioAttributes.Builder#setContentType(int)
       */
      public Builder setContentType(@C.AudioContentType int contentType) {
        this.contentType = contentType;
        return this;
      }
  
      /**
       * @see android.media.AudioAttributes.Builder#setFlags(int)
       */
      public Builder setFlags(@C.AudioFlags int flags) {
        this.flags = flags;
        return this;
      }
  
      /**
       * @see android.media.AudioAttributes.Builder#setUsage(int)
       */
      public Builder setUsage(@C.AudioUsage int usage) {
        this.usage = usage;
        return this;
      }
  
      /**
       * Creates an {@link AudioAttributes} instance from this builder.
       */
      public AudioAttributes build() {
        return new AudioAttributes(contentType, flags, usage);
      }
  
    }
  
    @C.AudioContentType
    public final int contentType;
    @C.AudioFlags
    public final int flags;
    @C.AudioUsage
    public final int usage;
  
    private android.media.AudioAttributes audioAttributesV21;
  
    private AudioAttributes(@C.AudioContentType int contentType, @C.AudioFlags int flags,
        @C.AudioUsage int usage) {
      this.contentType = contentType;
      this.flags = flags;
      this.usage = usage;
    }
  
    @TargetApi(21)
    /* package */ android.media.AudioAttributes getAudioAttributesV21() {
      if (audioAttributesV21 == null) {
        audioAttributesV21 = new android.media.AudioAttributes.Builder()
            .setContentType(contentType)
            .setFlags(flags)
            .setUsage(usage)
            .build();
      }
      return audioAttributesV21;
    }
  
    @Override
    public boolean equals(Object obj) {
      if (this == obj) {
        return true;
      }
      if (obj == null || getClass() != obj.getClass()) {
        return false;
      }
      AudioAttributes other = (AudioAttributes) obj;
      return this.contentType == other.contentType && this.flags == other.flags
          && this.usage == other.usage;
    }
  
    @Override
    public int hashCode() {
      int result = 17;
      result = 31 * result + contentType;
      result = 31 * result + flags;
      result = 31 * result + usage;
      return result;
    }
  
  }
  