Forums > Java

accessing other inlets within code

Mar 04 2013 | 12:18 pm

Hi there

I am developing a code to make a comb filter within maxmsp using java. However I have stumbled upon a problem. Here is my code
public class IntelliTest extends MSPPerformer{
float []_circBuffer = sr; //defined in dsp setup method
int _delayTime = getInlet();
int _readIndex1 = 0;
int _writeIndex = _delayTime;

float _feedBack = 0.0f;
float _feedForward = 0.0f;
float _blend = 0.0f;

declareInlets(new int[]{SIGNAL, DataTypes.FLOAT,DataTypes.FLOAT,DataTypes.FLOAT,DataTypes.INT,SIGNAL});
declareOutlets(new int[]{SIGNAL});

// user set delaytime
public void inlet (int i) {
if(i >= 0 && i < _circBuffer.length){
_delayTime = i; // need to convert to samples
post("Delay cannot be negative or exceed the buffer size");

// user set feedback
public void inlet (float f){
if(f > 0 && f < 0.99){
_feedBack = f;
post("Feedback cannot be negative or exceed 0.99"); //need to establish processing of other float inlets


As you can see I have missed out part of the code as I can’t work out how to establish the other inlets within the code. For example I can access the delay time via float..but can’t access any of the other inlets as I don’t know how to number them. Do I use atoms?

Any help would be appreciated.


Mar 04 2013 | 10:18 pm

you need to tell the object to check which inlet has been used, this code is for 6 inlets (0,1,2,3,4,5) so for your float inlets you need to have the code like so ….

public void inlet(float f)
int floatInlet;
floatInlet = getInlet(); // this tells your inlet to check what inlet the signals are coming from

if (floatInlet == 1){ // this says if the info is coming in on inlet 1 then do such and such with the info
do something
if (floatInlet == 2){ // this says if the info is coming in on inlet 2 then do such and such with the info
do something else

good luck with the comb filter.

ps. you might wanna change Daves delay post comments. :-P

Mar 05 2013 | 11:41 am

As an aside, I’ve yet to be convinced that this technique (explicit callback to determine the inlet used) is thread-safe. It depends, I suppose, whether getInlet() contains a link to the thread which made the initial call to inlet(), but there’s no mention of this in any of the documentation. So, you might want to think about using a pak upstream to pack messages into one inlet with a prefix string to distinguish them.

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Forums > Java