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      1 /*
      2  * Copyright (C) 2015 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 package android.car.media;
     17 
     18 import android.annotation.IntDef;
     19 import android.content.Context;
     20 import android.media.AudioAttributes;
     21 import android.media.AudioManager;
     22 import android.media.AudioManager.OnAudioFocusChangeListener;
     23 import android.os.IBinder;
     24 import android.os.RemoteException;
     25 import android.car.CarManagerBase;
     26 
     27 import java.lang.annotation.Retention;
     28 import java.lang.annotation.RetentionPolicy;
     29 
     30 /**
     31  * APIs for handling car specific audio stuffs.
     32  */
     33 public class CarAudioManager implements CarManagerBase {
     34 
     35     /**
     36      * Audio usage for unspecified type.
     37      */
     38     public static final int CAR_AUDIO_USAGE_DEFAULT = 0;
     39     /**
     40      * Audio usage for playing music.
     41      */
     42     public static final int CAR_AUDIO_USAGE_MUSIC = 1;
     43     /**
     44      * Audio usage for H/W radio.
     45      */
     46     public static final int CAR_AUDIO_USAGE_RADIO = 2;
     47     /**
     48      * Audio usage for playing navigation guidance.
     49      */
     50     public static final int CAR_AUDIO_USAGE_NAVIGATION_GUIDANCE = 3;
     51     /**
     52      * Audio usage for voice call
     53      */
     54     public static final int CAR_AUDIO_USAGE_VOICE_CALL = 4;
     55     /**
     56      * Audio usage for voice search or voice command.
     57      */
     58     public static final int CAR_AUDIO_USAGE_VOICE_COMMAND = 5;
     59     /**
     60      * Audio usage for playing alarm.
     61      */
     62     public static final int CAR_AUDIO_USAGE_ALARM = 6;
     63     /**
     64      * Audio usage for notification sound.
     65      */
     66     public static final int CAR_AUDIO_USAGE_NOTIFICATION = 7;
     67     /**
     68      * Audio usage for system sound like UI feedback.
     69      */
     70     public static final int CAR_AUDIO_USAGE_SYSTEM_SOUND = 8;
     71     /**
     72      * Audio usage for playing safety alert.
     73      */
     74     public static final int CAR_AUDIO_USAGE_SYSTEM_SAFETY_ALERT = 9;
     75 
     76     /** @hide */
     77     public static final int CAR_AUDIO_USAGE_MAX = CAR_AUDIO_USAGE_SYSTEM_SAFETY_ALERT;
     78 
     79     /** @hide */
     80     @IntDef({CAR_AUDIO_USAGE_DEFAULT, CAR_AUDIO_USAGE_MUSIC, CAR_AUDIO_USAGE_RADIO,
     81         CAR_AUDIO_USAGE_NAVIGATION_GUIDANCE, CAR_AUDIO_USAGE_VOICE_CALL,
     82         CAR_AUDIO_USAGE_VOICE_COMMAND, CAR_AUDIO_USAGE_ALARM, CAR_AUDIO_USAGE_NOTIFICATION,
     83         CAR_AUDIO_USAGE_SYSTEM_SOUND, CAR_AUDIO_USAGE_SYSTEM_SAFETY_ALERT})
     84     @Retention(RetentionPolicy.SOURCE)
     85     public @interface CarAudioUsage {}
     86 
     87     private final ICarAudio mService;
     88     private final AudioManager mAudioManager;
     89 
     90     /**
     91      * Get {@link AudioAttributes} relevant for the given usage in car.
     92      * @param carUsage
     93      * @return
     94      */
     95     public AudioAttributes getAudioAttributesForCarUsage(@CarAudioUsage int carUsage) {
     96         try {
     97             return mService.getAudioAttributesForCarUsage(carUsage);
     98         } catch (RemoteException e) {
     99             AudioAttributes.Builder builder = new AudioAttributes.Builder();
    100             return builder.setContentType(AudioAttributes.CONTENT_TYPE_UNKNOWN).
    101                     setUsage(AudioAttributes.USAGE_UNKNOWN).build();
    102         }
    103     }
    104 
    105     /**
    106      * Request audio focus.
    107      * Send a request to obtain the audio focus.
    108      * @param l
    109      * @param requestAttributes
    110      * @param durationHint
    111      * @param flags
    112      */
    113     public int requestAudioFocus(OnAudioFocusChangeListener l,
    114                                  AudioAttributes requestAttributes,
    115                                  int durationHint,
    116                                  int flags) throws IllegalArgumentException {
    117         return mAudioManager.requestAudioFocus(l, requestAttributes, durationHint, flags);
    118     }
    119 
    120     /**
    121      * Abandon audio focus. Causes the previous focus owner, if any, to receive focus.
    122      * @param l
    123      * @param aa
    124      * @return {@link #AUDIOFOCUS_REQUEST_FAILED} or {@link #AUDIOFOCUS_REQUEST_GRANTED}
    125      */
    126     public int abandonAudioFocus(OnAudioFocusChangeListener l, AudioAttributes aa) {
    127         return mAudioManager.abandonAudioFocus(l, aa);
    128     }
    129 
    130     @Override
    131     public void onCarDisconnected() {
    132         // TODO Auto-generated method stub
    133     }
    134 
    135     /** @hide */
    136     public CarAudioManager(IBinder service, Context context) {
    137         mService = ICarAudio.Stub.asInterface(service);
    138         mAudioManager = (AudioManager) context.getSystemService(Context.AUDIO_SERVICE);
    139     }
    140 }
    141