Peiman

I'm working on a little java external to merge all the channels of an 8-channel file into one. It's all working, except that the content of the resulting buffer is twice the speed (and half the duration) or the original. I cannot figure out why since I'm just using a straight copy with MSPBuffer.pok and MSPBuffer.peek...

I'd really appreciate it if a java guru could take a look at the code below and tell me where I'm going wrong. I only started learning java two days ago so I'm a little clueless!

    String destination = null;    

        declareAttribute("destination");

        declareInlets(new int[]{DataTypes.ALL});

        declareOutlets(new int[]{DataTypes.ALL});

            bufname = a[0].toString();

             destination = a[1].toString();

        float[] samps = MSPBuffer.peek(destination, 0);

        double max = Double.MIN_VALUE;

            if (Math.abs(samps[i]) > max)

                max = Math.abs(samps[i]);

        double scale = ((double)Math.abs(1))/max;

            samps[i] *= scale;

        MSPBuffer.poke(destination, 0, samps);

        float[] arrayA = MSPBuffer.peek(bufname, 0);

        float[] arrayB = MSPBuffer.peek(bufname, 1);

        float[] arrayC = MSPBuffer.peek(bufname, 2);

        float[] arrayD = MSPBuffer.peek(bufname, 3);

        float[] arrayE = MSPBuffer.peek(bufname, 4);

        float[] arrayF = MSPBuffer.peek(bufname, 5);

        float[] arrayG = MSPBuffer.peek(bufname, 6);

        float[] arrayH = MSPBuffer.peek(bufname, 7);

        float[] arraySum = new float[arrayA.length];

        for (int i = 0; i < arrayA.length; ++i){

            arraySum[i] = arrayA[i] + arrayB[i] + arrayC[i] + arrayD[i] + arrayE[i] + arrayF[i] + arrayG[i] + arrayH[i];

        MSPBuffer.poke(destination, arraySum);

import com.cycling74.max.*;
import com.cycling74.msp.*;

	String bufname = null;
	String destination = null;	

	buftest(Atom[] a) {
		declareAttribute("destination");
		declareInlets(new int[]{DataTypes.ALL});
		declareOutlets(new int[]{DataTypes.ALL});
		createInfoOutlet(false);
		if (a.length>0)
			bufname = a[0].toString();
		  	destination = a[1].toString();
		}

	public void normalize() {
		float[] samps = MSPBuffer.peek(destination, 0);
		double max = Double.MIN_VALUE;
		for (int i=0;i
			if (Math.abs(samps[i]) > max)
				max = Math.abs(samps[i]);
		double scale = ((double)Math.abs(1))/max;
		for (int i=0;i
			samps[i] *= scale;
		MSPBuffer.poke(destination, 0, samps);
	}

		float[] arrayA = MSPBuffer.peek(bufname, 0);
		float[] arrayB = MSPBuffer.peek(bufname, 1);
		float[] arrayC = MSPBuffer.peek(bufname, 2);
		float[] arrayD = MSPBuffer.peek(bufname, 3);
		float[] arrayE = MSPBuffer.peek(bufname, 4);
		float[] arrayF = MSPBuffer.peek(bufname, 5);
		float[] arrayG = MSPBuffer.peek(bufname, 6);
		float[] arrayH = MSPBuffer.peek(bufname, 7);

		float[] arraySum = new float[arrayA.length];

		for (int i = 0; i < arrayA.length; ++i){
			arraySum[i] = arrayA[i] + arrayB[i] + arrayC[i] + arrayD[i] + arrayE[i] + arrayF[i] + arrayG[i] + arrayH[i];
		}

		MSPBuffer.poke(destination, arraySum);
		normalize();

java-mspbuffer-pok-question

I think I found the answer. It's to do with the MSP sample rate at the time the buffer was created.

java MSPBuffer.pok question