B4J Question jAudioRecord and JaudioTrack : LineUnavailable

[ludogomez]

Hi,

I try to use these 2 librairies : jAudioRecord and JaudioTrack with a raspberry pi.

When I use internal sound card, I can use JaudioTrack without problem, I can't use JaudioRecord because the pi board don't have audio input.
That's why I want to use an USB soundcard with headphone out and Mic IN.

When I initialize jaudioTrack or JaudioRecord with the USB soundcard, I have this message : lineUnavailable and I can't record or play something.

Do you have an idea ?
I try 2 different USB soundCard.

thanks

 

[stevel05]

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.

 

[ludogomez]

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.

 

[stevel05]

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

 

[ludogomez]

Hi,

The USB soundcard works very well with the PI OS.

Thanks

 

[stevel05]

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

 

[ludogomez]

Hi,

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

I can't use GUI, only console.

Thanks
Regards

 

[stevel05]

Here is a non Gui version to try

 

[ludogomez]

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

 

[stevel05]

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.

What is the USB device you are using?

 

[ludogomez]

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

 

[stevel05]

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.

 

[ludogomez]

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

 

[stevel05]

You could try making it mono 44100,16,1