Multiple target datalines to multiple sound cards

Question

Is there any way to accomplish the following:
I have 4 distinct sound cards. I am using 4 distinct target datalines (1 dataline per 1 microphone input), each in a separate thread, to sample sound.
Let me start with this question, is this scenario even possible with the current implementation of Java Sound?
If the microphones are in a linear array, spaced evenly apart, I would expect to see the the sound at the last microphone arrive after the sound of the first microphone. However, this does not always occur. This leads me to believe that one or more of the threads reading the target datalines is being starved.
I've checked for buffer overflows as follows:
          int internalBufferSize = tdl.getBufferSize();
                    if (internalBufferSize == tdl.available()) {
                     System.err.println("Buffer overflow detected!");
                     }I'm not getting any buffer overflow errors.
As an experiment, I've attempted to attach multiple target datalines to a single sound device. While that will work fine (i.e., Java doesn't complain), I notice that when I read the data from the target datalines, I'm only getting the data from one or the other lines, but NOT both at the same time. Even though this isn't the same scenario I proposed, is there something in the Java Sound implementation that will prevent one target dataline per sound device in a JVM?
I'm fairly new to Java Sound, and I'm at a complete loss. I've gotten the same solution to work in other languages, however, I need Java for this particular application.

Answer 1

Markus00000 wrote:
In
/etc/modprobe.d/alsa.conf
I put
options snd-hda-intel index=0
options snd-usb-audio index=1
If you give your default sound card index 0 and your USB camera a higher index, it might work.
Thanks a lot. This indeed solved the problem.
jmak