Recording and playing back the recorded data immediatelyPurpose.
This program opens two lines: one for recording and one
for playback. In an infinite loop, it reads data from
the recording line and writes them to the playback line.
You can use this to measure the delays inside Java Sound:
Speak into the microphone and wait untill you hear
yourself in the speakers. This can be used to
experience the effect of changing the buffer sizes: use
the -e and -i options.
You will notice that the
delays change, too.
Usage.
java AudioLoop [
-M mixername
] [
-e buffersize
] [
-i buffersize
] Parameters. -
-l
lists the available mixers -
-M mixername
selects a mixer to play on -
-e buffersize
the buffer size to use in the application ("extern") -
-i buffersize
the buffer size to use in Java Sound ("intern")
Bugs, limitations.
There is no way to stop the program besides brute force
(ctrl-C). There is no way to set the audio quality.
The example requires that the soundcard and its driver
as well as the Java Sound implementation support full-duplex
operation. In Linux either use Tritonus or enable
full-duplex in Sun's Java Sound implementation (search the
archive of java-linux). Source code.
AudioLoop.java,
AudioCommon.java,
gnu.getopt.Getopt
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