[UCCx] Change volume of an audio file (java code)

Question

Hello guys,
Thanks to the many examples I compiled on the subject, I was able to create a script that mixes 2 audio wav files into a 3rd one. Basically the goal is to mix a first audio file containing some speech with a second one containing some music, these files being encoded identically (8 bits, 8KHz, mono wav files). The resulting file must be encoded in the same format than the initial ones.
The mixing operation is performed thanks to the MixingAudioInputStream library found online (it can be found here).
It is not the most beautiful Java code (I am no developer), but it works:
Document doc1 = (Document) promptFlux1;
Document doc2 = (Document) promptFlux2;
Document docFinal = (Document) promptFinal;
javax.sound.sampled.AudioFormat formatAudio = null;
java.util.List audioInputStreamList = new java.util.ArrayList();
javax.sound.sampled.AudioInputStream ais1 = null;
javax.sound.sampled.AudioInputStream ais2 = null;
javax.sound.sampled.AudioInputStream aisTemp = null;
javax.sound.sampled.AudioFileFormat formatFichierAudio = javax.sound.sampled.AudioSystem.getAudioFileFormat(new java.io.BufferedInputStream(doc1.getInputStream()));
java.io.File fichierTemp = java.io.File.createTempFile("wav", "tmp");
ais1 = javax.sound.sampled.AudioSystem.getAudioInputStream(doc1.getInputStream());
formatAudio = ais1.getFormat();
aisTemp = javax.sound.sampled.AudioSystem.getAudioInputStream(doc2.getInputStream());
byte[] bufferTemp = new byte[(int)ais1.getFrameLength()];
int nbOctetsLus = aisTemp.read(bufferTemp, 0, bufferTemp.length);
java.io.ByteArrayInputStream baisTemp = new java.io.ByteArrayInputStream(bufferTemp);
ais2 = new javax.sound.sampled.AudioInputStream(baisTemp, formatAudio, bufferTemp.length/formatAudio.getFrameSize());
audioInputStreamList.add(ais1);
audioInputStreamList.add(ais2);
MixingAudioInputStream mixer = new MixingAudioInputStream(formatAudio, audioInputStreamList);
javax.sound.sampled.AudioSystem.write(mixer, formatFichierAudio.getType(), fichierTemp);
return fichierTemp;
The only downside to this is that the music can be a little loud comparing to the speech. So I am now trying to use the AmplitudeAudioInputStream library to adjust the volume of the second file (it can be found here).
Here are the additional lines I wrote to do this:
ais2 = new javax.sound.sampled.AudioInputStream(baisTemp, formatAudio, bufferTemp.length/formatAudio.getFrameSize());
org.tritonus.dsp.ais.AmplitudeAudioInputStream amplifiedAudioInputStream = new org.tritonus.dsp.ais.AmplitudeAudioInputStream(ais2, formatAudio);
amplifiedAudioInputStream.setAmplitudeLinear(0.2F);
audioInputStreamList.add(ais1);
audioInputStreamList.add(amplifiedAudioInputStream);
MixingAudioInputStream mixer = new MixingAudioInputStream(formatAudio, audioInputStreamList);
javax.sound.sampled.AudioSystem.write(mixer, formatFichierAudio.getType(), fichierTemp);
return fichierTemp;
The problem is I always get the following exception when executing the code:
could not write audio file: file type not supported: WAVE; nested exception is: java.lang.IllegalArgumentException: could not write audio file: file type not supported: WAVE (line 30, col:2)
The error is on the last line (the write method), but after many hours of tests and research I cannot understand why this is not working... so I have added some "debugging" information to the code:
System.out.println("file1 audio file format: " + formatFichierAudio.toString());
System.out.println("file1 file format: " + ais1.getFormat().toString());
System.out.println("file2 file format: " + ais2.getFormat().toString());
System.out.println("AIS with modified volume file format: " + amplifiedAudioInputStream.getFormat().toString());
System.out.println("Mixed AIS (final) file format: " + mixer.getFormat().toString());
AudioFileFormat.Type[] typesDeFichiers = AudioSystem.getAudioFileTypes(mixer);
for (int i = 0; i < typesDeFichiers.length ; i++) {
System.out.println("Mixed AIS (final) #" + i + " supported file format: " + typesDeFichiers[i].toString());
System.out.println("Is WAVE format supported by Mixed AIS (final): " + AudioSystem.isFileTypeSupported(AudioFileFormat.Type.WAVE, mixer));
System.out.println("Destination file format: " + (AudioSystem.getAudioFileFormat((java.io.File)f)).toString());
AudioInputStream aisFinal = AudioSystem.getAudioInputStream(f);
System.out.println("Is WAVE format supported by destination file: " + AudioSystem.isFileTypeSupported(AudioFileFormat.Type.WAVE, aisFinal));
try {
// Ecriture du flux résultant dans un fichier
javax.sound.sampled.AudioSystem.write(mixer, formatFichierAudio.getType(), fichierTemp);
return fichierTemp;
catch (Exception e) {
System.err.println("Caught Exception: " + e.getMessage());
Which gives the following result during execution:
file1 audio file format: WAVE (.wav) file, byte length: 146964, data format: ULAW 8000.0 Hz, 8 bit, mono, 1 bytes/frame, , frame length: 146906
file1 file format: ULAW 8000.0 Hz, 8 bit, mono, 1 bytes/frame,
file2 file format: ULAW 8000.0 Hz, 8 bit, mono, 1 bytes/frame,
AIS with modified volume file format: ULAW 8000.0 Hz, 8 bit, mono, 1 bytes/frame,
Mixed AIS (final) file format: ULAW 8000.0 Hz, 8 bit, mono, 1 bytes/frame,
Mixed AIS (final) #1 supported file format: WAVE
Mixed AIS (final) #2 supported file format: AU
Mixed AIS (final) #3 supported file format: AIFF
Is WAVE format supported by Mixed AIS (final): true
Destination file format: WAVE (.wav) file, byte length: 146952, data format: ULAW 8000.0 Hz, 8 bit, mono, 1 bytes/frame, , frame length: 146906
Is WAVE format supported by destination file: true
So everything tends to show that the format should be supported and the mixed AIS should be written to the file... but I still get the error.
I am really confused here, if someone could help it would be great.
Thanks in advance!
PS: I have attached print screens of the actual script, without the "volume adjustment" code.

Answer 1

Hi,
well I started writing a similar solution but it did not work either so I just put it on hold.
I also tried to get hold of the streaming "device" abstraction of UCCX to adjust the volume while "playing" but that was a dead end, too, unfortunately.
Sorry about my previous comment on your StackOverflow post, that time I thought it was kind of out of context but I believe you only wanted to ask about this issue on all available forums.
G.