Playing 2 musics through 2 different sound cards at same time
Playing 2 musics through 2 different sound cards at same time
Trying something pretty out of the box... I have a simple app with a button that when pushed, plays music out of the audio jack of my android tablet.
public void btn1 (View view)
MediaPlayer mp = MediaPlayer.create(this, R.raw.xxx);
mp.start();
I've now added a usb audio interface (through a micro usb adapter) and I can hear audio out of it.
I'm able to list the sound cards with this
AudioDeviceInfo devices = audioManager.getDevices(AudioManager.GET_DEVICES_OUTPUTS);
for (AudioDeviceInfo device : devices)
int b = device.getId();
int d = device.getType();
CharSequence productName = device.getProductName();
How do I route music so that I can play 2 different music at once, one through usb and the other through the headphone jack?
2 Answers
2
According to the MediaPlayer documentation, you can set the audio device using setPreferredDevice which receive an AudioDeviceInfo as a parameter, see https://developer.android.com/reference/android/media/MediaPlayer.html#setPreferredDevice(android.media.AudioDeviceInfo).
MediaPlayer
setPreferredDevice
AudioDeviceInfo
You will then have to create one MediaPlayer to play on each device.
MediaPlayer
it works about like this:
protected void playAudio()
this.playByDeviceIdx(0, R.raw.xxx);
this.playByDeviceIdx(1, R.raw.yyy);
protected void playByDeviceIdx(int deviceIndex, @IdRes int resId)
/* obtain audio-output device-infos */
deviceInfos devices = audioManager.getDevices(AudioManager.GET_DEVICES_OUTPUTS);
/* check, if the desired index is even within bounds */
if(deviceInfos.length < deviceIndex)
/* create an instance of MediaPlayer */
MediaPlayer mp = MediaPlayer.create(this, resId);
/* assign a preferred device to the MediaPlayer instance */
mp.setPreferredDevice(deviceInfos[deviceIndex]);
/* start the playback (only if a device exists at the index) */
mp.start();
you could also filter for the headset jack plug/unplug event:
IntentFilter intentFilter = new IntentFilter(Intent.ACTION_HEADSET_PLUG);
Intent intent = context.registerReceiver(null, intentFilter);
boolean isConnected = intent.getIntExtra("state", 0) == 1;
sources: me, based upon the SDK documentation for the MediaPlayer.
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