B4J Question jAudioRecord and JaudioTrack : LineUnavailable

jAudiorecord and jAudiotrack only work with the default audio in and out. If you can change the system default to the USB device it should work.

I try to change the system default to the USB device, but I have the same behaviour even if I desactivate the internal soundcard.

Thanks for your response.

Can you play audio through the USB device using the PI OS?

Hi,

The USB soundcard works very well with the PI OS.

Thanks

Can you try the test app here and see if it works on the Pi. : https://www.b4x.com/android/forum/threads/play-audio-through-selected-soundcard.85448/#post-541413

Hi,

it's impossible because Java don't provide ARM javafx.

I can't use GUI, only console.

Thanks
Regards

Here is a non Gui version to try

This is the result :


Waiting for debugger to connect...
Program started.
Set [default]

Here I have a trumpet sound, just 2 second

ALSA [plughw:0,0]
ALSA [plughw:0,1]
Une erreur s'est produite en ligne : 31 (Main)
java.lang.reflect.InvocationTargetException
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at anywheresoftware.b4j.object.JavaObject.RunMethod(JavaObject.java:131)
at b4j.example.main._appstart(main.java:118)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at anywheresoftware.b4a.shell.Shell.runMethod(Shell.java:625)
at anywheresoftware.b4a.shell.Shell.raiseEventImpl(Shell.java:234)
at anywheresoftware.b4a.shell.Shell.raiseEvent(Shell.java:168)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeM
ethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at anywheresoftware.b4a.BA.raiseEvent2(BA.java:90)
at anywheresoftware.b4a.ShellBA.raiseEvent2(ShellBA.java:94)
at anywheresoftware.b4a.BA.raiseEvent(BA.java:77)
at b4j.example.main.main(main.java:29)
Caused by: javax.sound.sampled.LineUnavailableException: line with format PCM_SIGNED 44100.0 Hz, 16 bit, stereo, 4 bytes/frame, little-endian not supported.
at com.sun.media.sound.DirectAudioDevice$DirectDL.implOpen(DirectAudioDevice.java:513)
at com.sun.media.sound.DirectAudioDevice$DirectClip.implOpen(DirectAudioDevice.java:1304)
at com.sun.media.sound.AbstractDataLine.open(AbstractDataLine.java:121)
at com.sun.media.sound.DirectAudioDevice$DirectClip.open(DirectAudioDevice.java:1085)
at com.sun.media.sound.DirectAudioDevice$DirectClip.open(DirectAudioDevice.java:1175)
... 21 more
Program terminated (StartMessageLoop was not called).

Thanks

OK this is the problem :

Caused by: javax.sound.sampled.LineUnavailableException: line with format PCM_SIGNED 44100.0 Hz, 16 bit, stereo, 4 bytes/frame, little-endian not supported.

Click to expand...

What is the USB device you are using?

I use a generic USB sound card :
Bus 001 Device 004: ID 0d8c:000c C-Media Electronics, Inc. Audio Adapter

I try with another usnb sound card with the same problem.

I initialize the player with at.Initialize(22050,16,2).

is it possible to try all parameters to know the good one.

Thanks

It is possible that it will need a sample rate of 48000, some cards only work with this rate. Although it is possible that the playback will be a different speed and pitch.

I try with 44100, 16, 2, it works, I don't have lineUnavailable with jaudiotrack and jaudiorecord.

I use your librairies to make an video home interphone between my external door and a tablet. I need to stream in 2 ways the audio. I want to limit the bandwith between the devices, 44100, 16 bits is too high. I'll try other frequency and sampling parameters.

Thanks a lot for debuging my problem

You could try making it mono 44100,16,1