连接BassBoost时无法播放MediaPlayer-错误（-22，0）

Question

It should be simple as this:

private void startPlaying() {
    mPlayer = new MediaPlayer();
    try {
        mPlayer.setDataSource(mFileName);

        BassBoost bassBoost = new BassBoost(0, mPlayer.getAudioSessionId());
        mPlayer.attachAuxEffect(bassBoost.getId());
        bassBoost.setStrength((short)1000);
        bassBoost.setEnabled(true);
        mPlayer.setAuxEffectSendLevel(1.0f);

        mPlayer.prepare();

        mPlayer.setOnPreparedListener(new MediaPlayer.OnPreparedListener() {

            @Override
            public void onPrepared(MediaPlayer mp) {
                mPlayer.start();
            }
        });
    } catch (IOException e) {
        // TODO Auto-generated catch block
       e.printStackTrace();
        throw new RuntimeException(e);
    }
        }

When I try, it is quiet and I get the error (-22,0) in the log. If I comment the lines between BassBoost bassBoost = ... and mPlayer.setAuxEffectSendLevel it plays the sound OK.

I went though documentation, but I cant fidn the error. Permissions in manifest:

<uses-permission android:name="android.permission.RECORD_AUDIO"/> 
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.WAKE_LOCK" />
<uses-permission android:name="android.permission.MODIFY_AUDIO_SETTINGS"/>

Answer 1

You are already attached your bassboost with your mediaplayer when it created. So remove this line mPlayer.attachAuxEffect(bassBoost.getId());

Answer 2

Yep, remove the method attachAuxEffect from the media player class, I mean this linemPlayer.attachAuxEffect(bassBoost.getId());

Secondly you can call bass boost object at any state of the media player excluding the idle state