Andorid Audioservice调试音乐音频

RK3288[android 7.1]调试笔记 修改默认Music, video, games, & other media音乐，视频，游戏，铃声和通知等音量设置为70%
修改路径为/frameworks/base/media/java/android/media/AudioSystem.java文件

wangxd@build-server-100:~/work/dsy/rk3288-Android-7.0/frameworks/base(m_android_7_0)$ git diff media/java/android/media/AudioSystem.java
diff --git a/media/java/android/media/AudioSystem.java b/media/java/android/media/AudioSystem.java
old mode 100644
new mode 100755
index f597440…219089c
— a/media/java/android/media/AudioSystem.java
+++ b/media/java/android/media/AudioSystem.java
@@ -762,16 +762,16 @@ public class AudioSystem
}

 public static int[] DEFAULT_STREAM_VOLUME = new int[] {//这里修改默认的音量值 11/15=0.73 接近70%

•    4,  // STREAM_VOICE_CALL
  

•    7,  // STREAM_SYSTEM
  

•    5,  // STREAM_RING
  

•    11,  // STREAM_VOICE_CALL
  

•    11,  // STREAM_SYSTEM
  

•    11,  // STREAM_RING
     11, // STREAM_MUSIC
  

•    6,  // STREAM_ALARM
  

•    5,  // STREAM_NOTIFICATION
  

•    7,  // STREAM_BLUETOOTH_SCO
  

•    7,  // STREAM_SYSTEM_ENFORCED
  

•    11, // STREAM_DTMF
  

•    11  // STREAM_TTS
  

•    11,  // STREAM_ALARM
  

•    11,  // STREAM_NOTIFICATION
  

•    11,  // STREAM_BLUETOOTH_SCO
  

•    11,  // STREAM_SYSTEM_ENFORCED
  

•    11, // STREAM_DTMF
  

•    11  // STREAM_TTS
  

  };

  public static String streamToString(int stream) {
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  修改路径为/frameworks/base/services/core/java/com/android/server/audio/AudioService.java文件

wangxd@build-server-100:~/work/dsy/rk3288-Android-7.0/frameworks/base(m_android_7_0)$ git diff services/core/java/com/android/server/audio/AudioService.java
diff --git a/services/core/java/com/android/server/audio/AudioService.java b/services/core/java/com/android/serve
old mode 100644
new mode 100755
index 40ae864…3fd67a3
— a/services/core/java/com/android/server/audio/AudioService.java
+++ b/services/core/java/com/android/server/audio/AudioService.java
@@ -261,14 +261,14 @@ public class AudioService extends IAudioService.Stub {

/** Maximum volume index values for audio streams */
 private static int[] MAX_STREAM_VOLUME = new int[] {//这里修改音量的最大值都设为15

•    5,  // STREAM_VOICE_CALL
  

•    7,  // STREAM_SYSTEM
  

•    7,  // STREAM_RING
  

•    15,  // STREAM_VOICE_CALL
  

•    15,  // STREAM_SYSTEM
  

•    15,  // STREAM_RING
     15, // STREAM_MUSIC
  

•    7,  // STREAM_ALARM
  

•    7,  // STREAM_NOTIFICATION
  

•    15,  // STREAM_ALARM
  

•    15,  // STREAM_NOTIFICATION
     15, // STREAM_BLUETOOTH_SCO
  

•    7,  // STREAM_SYSTEM_ENFORCED
  

•    15,  // STREAM_SYSTEM_ENFORCED
     15, // STREAM_DTMF
     15  // STREAM_TTS
  

  };
  /** Minimum volume index values for audio streams */
  private static int[] MIN_STREAM_VOLUME = new int[] {//这里使用是默认的音量最小值
  1, // STREAM_VOICE_CALL
  0, // STREAM_SYSTEM
  0, // STREAM_RING
  0, // STREAM_MUSIC
  0, // STREAM_ALARM
  0, // STREAM_NOTIFICATION
  0, // STREAM_BLUETOOTH_SCO
  0, // STREAM_SYSTEM_ENFORCED
  0, // STREAM_DTMF
  0 // STREAM_TTS
  };
  @@ -614,19 +614,19 @@ public class AudioService extends IAudioService.Stub {
  Vibrator vibrator = (Vibrator) context.getSystemService(Context.VIBRATOR_SERVICE);
  mHasVibrator = vibrator == null ? false : vibrator.hasVibrator();

•    // Initialize volume
  

•    int maxVolume = SystemProperties.getInt("ro.config.vc_call_vol_steps",
  

•            MAX_STREAM_VOLUME[AudioSystem.STREAM_VOICE_CALL]);
  

•    if (maxVolume != MAX_STREAM_VOLUME[AudioSystem.STREAM_VOICE_CALL]) {
  

•        MAX_STREAM_VOLUME[AudioSystem.STREAM_VOICE_CALL] = maxVolume;
  

•        AudioSystem.DEFAULT_STREAM_VOLUME[AudioSystem.STREAM_VOICE_CALL] = (maxVolume * 3) / 4;
  

•    }
  

•    maxVolume = SystemProperties.getInt("ro.config.media_vol_steps",
  

•            MAX_STREAM_VOLUME[AudioSystem.STREAM_MUSIC]);
  

•    if (maxVolume != MAX_STREAM_VOLUME[AudioSystem.STREAM_MUSIC]) {
  

•        MAX_STREAM_VOLUME[AudioSystem.STREAM_MUSIC] = maxVolume;
  

•        AudioSystem.DEFAULT_STREAM_VOLUME[AudioSystem.STREAM_MUSIC] = (maxVolume * 3) / 4;
  

•    }
    //这里把在system.prop获取的音量设定值给屏蔽掉使用上面修改的值，为什么要屏蔽掉，原因是如果在system.prop获取的音量设定值与我们修改在上面默认音量值，默认音量最大值，默认音量最小值的结构体里的值不一致，会把我们的设定值变为设定值的3/4
  

•    // // Initialize volume   
  

•    // int maxVolume = SystemProperties.getInt("ro.config.vc_call_vol_steps",
  

•    //         MAX_STREAM_VOLUME[AudioSystem.STREAM_VOICE_CALL]);
  

•    // if (maxVolume != MAX_STREAM_VOLUME[AudioSystem.STREAM_VOICE_CALL]) {
  

•    //     MAX_STREAM_VOLUME[AudioSystem.STREAM_VOICE_CALL] = maxVolume;
  

•    //     AudioSystem.DEFAULT_STREAM_VOLUME[AudioSystem.STREAM_VOICE_CALL] = (maxVolume * 3) / 4;
  

•    // }
  

•    // maxVolume = SystemProperties.getInt("ro.config.media_vol_steps",
  

•    //         MAX_STREAM_VOLUME[AudioSystem.STREAM_MUSIC]);
  

•    // if (maxVolume != MAX_STREAM_VOLUME[AudioSystem.STREAM_MUSIC]) {
  

•    //     MAX_STREAM_VOLUME[AudioSystem.STREAM_MUSIC] = maxVolume;
  

•    //     AudioSystem.DEFAULT_STREAM_VOLUME[AudioSystem.STREAM_MUSIC] = (maxVolume * 3) / 4;
  

•    // }
  
     sSoundEffectVolumeDb = context.getResources().getInteger(
             com.android.internal.R.integer.config_soundEffectVolumeDb);
  

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版权声明：本文为CSDN博主「d海阔天空」的原创文章，遵循CC 4.0 BY-SA版权协议，转载请附上原文出处链接及本声明。
原文链接：https://blog.csdn.net/MrDongShiYi/article/details/93973764