Setting default volume levels at AOSP Marshmallow image

Question

I'm making custom AOSP Marshmallow image and i would like to set default volume levels higher by default.

I found from Chinese forum that under frameworks/base/media/java/android/media/AudioSystem.java can be found

/**
* M: modify the default stream volume @{
*/
public static int[] DEFAULT_STREAM_VOLUME = new int[] {
    4,  // STREAM_VOICE_CALL
    15,  // STREAM_SYSTEM
    8,  // STREAM_RING
    8, // STREAM_MUSIC
    8,  // STREAM_ALARM
    8,  // STREAM_NOTIFICATION
    7,  // STREAM_BLUETOOTH_SCO
    15,  // STREAM_SYSTEM_ENFORCED
    11, // STREAM_DTMF
    11  // STREAM_TTS
};
/** @} */

and under frameworks/base/services/core/java/com/android/server/audio/AudioService.java is then minimum and maximum volume values.

/** Maximum volume index values for audio streams */
/// M: Modify the max stream volume @{
private static int[] MAX_STREAM_VOLUME = new int[] {
    7,  // STREAM_VOICE_CALL
    15,  // STREAM_SYSTEM
    15,  // STREAM_RING
    15, // STREAM_MUSIC
    15,  // STREAM_ALARM
    15,  // STREAM_NOTIFICATION
    15, // STREAM_BLUETOOTH_SCO
    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[] {
    1,  // STREAM_VOICE_CALL
    0,  // STREAM_SYSTEM
    0,  // STREAM_RING
    0,  // STREAM_MUSIC
    0,  // STREAM_ALARM
    0,  // STREAM_NOTIFICATION
    1,  // STREAM_BLUETOOTH_SCO
    0,  // STREAM_SYSTEM_ENFORCED
    0,  // STREAM_DTMF
    0   // STREAM_TTS
};

I have changed STREAM_MUSIC, STREAM_ALARM and STREAM_NOTIFICATION from DEFAULT_STREAM_VOLUME table from 8 to 13 but it doesn't seem to have any effect when building and making images.

Any idea what might be the problem or correct location to change default volume levels?

foobar2 foobar2 · Accepted Answer · 2018-02-25T15:20:56

Did you do a factory reset after flashing?

The default volume only applies to the first boot. Then, the volume level is persisted for the next boots.

Setting default volume levels at AOSP Marshmallow image

1 Answers