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Thread: Multichannel Audio Stream into separate channel Buffers

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    Post Multichannel Audio Stream into separate channel Buffers

    I am relatively new to programming and have been carefully studying the documentation regarding Java audio. My end goal is to create an audio analysis app however I am having issues regarding dealing with the incoming datastream.


    I have requested a targetdataline with a specified format (For now assume I am dealing with just two channels, each with different content). What I need to do is split this stream into multiple circular buffers (one for each channel) that I can then process individually.

    try {
     
            line = (TargetDataLine) AudioSystem.getLine(info);
     
            line.open(format);
     
     
     
            ByteArrayOutputStream out  = new ByteArrayOutputStream();
     
            int numBytesRead;
     
            byte[] data = new byte[line.getBufferSize() / 5];
     
     
     
     
     
            line.start();
     
     
     
            int size = 0;
     
     
     
            while (size< 1000) {
     
     
     
                size++;
     
     
     
               numBytesRead =  line.read(data, 0, data.length);
     
     
     
               out.write(data, 0, numBytesRead);
     
            } 
     
     
     
             out.writeTo(outputStream);
     
     
            System.out.println(out.size());
     
        } catch (LineUnavailableException ex) {
     
     
     
        }finally{
     
            outputStream.close();
     
        }

    This is my current code for getting the targetdataline into a buffer but this does not deal with splitting the channels. I have spent ages on google and cannot find a method for splitting the stream every two bytes. If anyone can even point me towards some reading material on this it would be much appreciated, or suggest a way to go about this.

    Also, regarding this, is it more efficient to split the stream into multiple buffers (I could do each channel on a separate thread), or to write the entire stream to a buffer and then split the buffer content into separate channel data. (My head is telling me this is not efficient and I would need a bigger buffer size on one thread for this.

    Thanks for your help. This is my first post so I hope I have done it right.

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    Super Moderator Norm's Avatar
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    Default Re: Multichannel Audio Stream into separate channel Buffers

    Just so everyone knows, also posted at: Multichannel Audio Into Buffer With Separate Arrays - Java | Dream.In.Code
    If you don't understand my answer, don't ignore it, ask a question.

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