Background Music for Call

Background music for call

Some mobile platforms do support this functionality at the platform-level (e.g. I've tested this with the Qualcomm APQ8064 where I had configured the hardware codec route accordingly, and it works). But Android doesn't have an API that let's you use this as an app developer, so on a non-rooted phone there's not really anything you can do.
Why there's no API for it - or whether there will be one in coming versions of Android - I don't know. There might be legal issues in some markets, or it might just be because it's considered as a semi-obscure feature that they don't see a great demand for and which is supported only by a relatively small number of platforms.

Another thing to consider is, do you really want to have music playing in the background during a call?
The audio is going to be 8 kHz mono (or 16 kHz mono if you're in a wideband call), and it's going to be AMR-encoded along with the rest of the speech signal (AMR is a low-bitrate codec designed for encoding speech). In other words, any music you play over the voice call uplink is going to sound really, really bad.

UPDATE: For APQ8064-based phones where you have root access, the procedure would be something like this (I don't remember the exact syntax off the top of my head):

audioManager.setParameters("incall_music_enabled=true");

// Execute the following using e.g. Runtime.exec()
amix 'SLIMBUS_4_RX Audio Mixer MultiMedia2' 1
aplay -Dhw:0,1 mono_8khz_data.pcm

// When you want to stop music playback, stop the aplay process, and then do
audioManager.setParameters("incall_music_enabled=false");

Why does the Background music not pause after a call disconnects?

I have solved my problem. Below, I am posting code for my music service.

public class ChalisaService extends Service implements OnCompletionListener
{
static MediaPlayer mediaPlayer;
static int playerFlag = 0;
TelephonyManager tm;
ActivityManager actManager;
/**
 * 0 for stop/pause
 * 1 for play*/
@Override
public IBinder onBind(Intent intent) 
{
    return null;
}//onBind

@Override
public void onCreate() 
{
    super.onCreate();

    mediaPlayer = MediaPlayer.create(getApplicationContext(), R.raw.chalisa);
    mediaPlayer.setVolume(100, 100);
    mediaPlayer.setOnCompletionListener(this);
    tm = (TelephonyManager)getSystemService(TELEPHONY_SERVICE);
    tm.listen(mPhoneListener, PhoneStateListener.LISTEN_CALL_STATE);
}//onCreate

@Override
public int onStartCommand(Intent intent, int flags, int startId) 
{
    if(mediaPlayer.isPlaying())
    {
        mediaPlayer.pause();
        /*HanuAlarm.txtPlay.setText("Play");
        HanuAlarm.btn_Play.setBackgroundResource(R.drawable.btnplay);*/
        playerFlag = 0;
    }//if
    else
    {
        mediaPlayer.start();
        /*HanuAlarm.txtPlay.setText("Pause");
        HanuAlarm.btn_Play.setBackgroundResource(R.drawable.btnpause);*/
        playerFlag = 1;
    }//else

    startForeground(0, null);
    return playerFlag;
}//onStartCommand

@Override
public void onDestroy() 
{
    super.onDestroy();
    /*//mediaPlayer.stop();
    //mediaPlayer.release();
    playerFlag = 0;
    Log.v("Chalisa service", "on destroy called");*/
}//onDestroy

private PhoneStateListener mPhoneListener = new PhoneStateListener() {
    public void onCallStateChanged(int state, String incomingNumber) {
        switch (state) {
        case TelephonyManager.CALL_STATE_RINGING:
            if(mediaPlayer.isPlaying())
            {
                mediaPlayer.pause();
                playerFlag = 0;
            }//if
            break;

        case TelephonyManager.CALL_STATE_OFFHOOK:
            if(mediaPlayer.isPlaying())
            {
                mediaPlayer.pause();
                playerFlag = 0;
            }//if
            break;

            /**
             * Nitish 
             * 26 Sep 2012, Wed 
             * 11:50 AM*/
        case TelephonyManager.CALL_STATE_IDLE:
            if(!mediaPlayer.isPlaying())
            {
                mediaPlayer.start();
                playerFlag = 1;
            }//if
        default:
            Log.d("Chalisa Service", "Unknown phone state=" + state);
        }
    } 
};

public void onCompletion(MediaPlayer mp) 
{
    mp.stop();
    mp.release();
    playerFlag = 0;
    stopSelf();
    updateUI();
    Log.v("Chalisa Service media player", "on completion listener called");
}

private void updateUI() 
{
    Intent in = new Intent("com.dzo.HanumanChalisaWithAudioAndAlarm.UPDATE_UI");
    in.putExtra("Player_FLAG_VALUE", playerFlag);
    getApplicationContext().sendBroadcast(in);
}
}//ChalisaService

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