Delay in pressing button and sound(sf2) output from Android device

[Shivaraj Sajjan]

I am creating Android Project which has one button. I am playing sound using sound font files(sf2). This code is working fine. But when I play it there lot of latency (delay) between my button click and sound coming out of Android device. How to reduce this? Please help me

Code :

protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
try {
SF2Soundbank sf = new SF2Soundbank(getAssets().open("SmallTimGM6mb.sf2"));
synth = new SoftSynthesizer();
synth.open();
synth.loadAllInstruments(sf);
synth.getChannels()[0].programChange(0);
synth.getChannels()[1].programChange(1);
recv = synth.getReceiver();
} catch (IOException e) {
e.printStackTrace();
} catch (MidiUnavailableException e) {
e.printStackTrace();
}

this.findViewById(R.id.piano).setOnTouchListener(new View.OnTouchListener() {
@Override
public boolean onTouch(View v, MotionEvent event) {
int action = MotionEventCompat.getActionMasked(event);
if (action == MotionEvent.ACTION_DOWN) {
try {
ShortMessage msg = new ShortMessage();
msg.setMessage(ShortMessage.NOTE_ON, 0, 60, 127);
recv.send(msg, -1);
} catch (InvalidMidiDataException e) {
e.printStackTrace();
}
} else if (action == MotionEvent.ACTION_UP || action == MotionEvent.ACTION_CANCEL) {
try {
ShortMessage msg = new ShortMessage();
msg.setMessage(ShortMessage.NOTE_OFF, 0, 60, 127);
recv.send(msg, -1);
} catch (InvalidMidiDataException e) {
e.printStackTrace();
}
}
return true;
}
});

}

[Phil Burk]

Are you using the com.sun.media.sound.SF2Soundbank?

How are you doing that?

The Java implementation is probably using Java AudioTrack.

Hopefully they are using the PERFORMANCE_MODE_LOW_LATENCY.

https://developer.android.com/reference/android/media/AudioTrack#PERFORMANCE_MODE_LOW_LATENCY

https://developer.android.com/reference/android/media/AudioTrack.Builder#setPerformanceMode(int)

That could reduce latency by 70-80 msec.

Note the sample rates must match the native rate.

Phil Burk

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