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simple message logger for ChucK
by Robert Poor 21 Mar '10

21 Mar '10

I would guess this has already been written, but I got tired of writing and then commenting out trace / debugging comments in my ChucK code, so I put together this simple class modeled loosely after similar packages in Java other languages. It comprises all static functions, so you can call it from anywhere. If someone wants to extend the log() function to write to a file or stream, be my guest -- currently it simply prints to <<< >>> (stderr). Here is the code in its entirety. Share and enjoy. - Rob // File: log.ck // Log: A simple logging facility for ChucK // // Loosely modeled after logging packages in other languages, Log // allows you to sprinkle your code with print messages tagged with // different severity levels. What gets printed at run time depends // on the setting of the log severity level. The levels (from lowest // to highest severity) are: // // TRACE // DEBUG // INFO // WARN // ERROR // FATAL // // A simple example of usage: // ================ // class ArrayFns { // fun int iterate(Object things[]) { // Log.debug(this, "entering iterate()"); // if (things == null) { // Log.warn(this, "null array, returning 0"); // return 0; // } // for (0 => int i; i<things.size(); i++) { // if (Log.severity(Log.TRACE)) Log.log(this, "iterate(), processing " + i); // process(things[i]); // } // things.size() => int retval; // if (Log.severity(Log.DEBUG)) Log.log(this, "exiting iterate() with " + retval); // return retval; // } // } // ================ // The explanation: // // The line: // Log.debug(this, "entering iterate()"); // will print the message if Log.set_severity() is DEBUG or TRACE. // // The line: // Log.warn(this, "null array, returning 0"); // will print the message if Log.set_severity() is WARN or lower // (WARN, INFO, DEBUG or TRACE). // // The line: // if (Log.severity(TRACE)) Log.log(this, "iterate(), count=" + i); // is equivalent to: // Log.trace(this, "iterate(), count=" + i); // except that the latter form will always evaluate its arguments, // which in this case causes string catenation. You can avoid the // extra evaluation by using the first form, which will call Log.log() // iff the current severity level is TRACE. This is especially useful // in inner loops that are called often, or if the construction of the // error message itself is particularly costly. // // ==== Authors: // Robert Poor <r(a)alum.mit.edu> // ==== Revision History: // 20100321_214041: Initial Version // ==== public class Log { static int TRACE; static int DEBUG; static int INFO; static int WARN; static int ERROR; static int FATAL; static int _severity; fun static void init() { 0 => TRACE; 1 => DEBUG; 2 => INFO; 3 => WARN; 4 => ERROR; 5 => FATAL; set_severity(WARN); } // get/set the severity level fun static int get_severity() { return _severity; } fun static void set_severity(int severity) { severity => _severity; } // Return true if Log is at severity or lower fun static int severity(int level) { return level >= _severity; } fun static void trace(string msg) { log_if(TRACE, msg); } fun static void trace(Object o, string msg) { log_if(TRACE, o, msg); } fun static void debug(string msg) { log_if(DEBUG, msg); } fun static void debug(Object o, string msg) { log_if(DEBUG, o, msg); } fun static void info(string msg) { log_if(INFO, msg); } fun static void info(Object o, string msg) { log_if(INFO, o, msg); } fun static void warn(string msg) { log_if(WARN, msg); } fun static void warn(Object o, string msg) { log_if(WARN, o, msg); } fun static void error(string msg) { log_if(ERROR, msg); } fun static void error(Object o, string msg) { log_if(ERROR, o, msg); } fun static void fatal(string msg) { log_if(FATAL, msg); } fun static void fatal(Object o, string msg) { log_if(FATAL, o, msg); } // Conditionally log fun static void log_if(int level, string msg) { if (severity(level)) log(msg); } fun static void log_if(int level, Object o, string msg) { if (severity(level)) log(o, msg); } // Unconditionally log fun static void log(string msg) { log("[toplevel]", msg); } fun static void log(Object o, string msg) { <<< now, me, o.toString(), msg >>>; } } // setup static constants and defaults at load time. Log.init(); // ===== EOF =====

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what is the syntax for casting an array of objects?
by Robert Poor 20 Mar '10

20 Mar '10

I'm getting a message: > [babble_patch.ck]:line(142): arguments type(s) do not match: [babble_patch.ck]:line(142): ... for function > 'PatchableObserver.attach_all(...)' ... [babble_patch.ck]:line(142): ...(please check the argument types) The line in question in file babble_patch.ck:line(142): > PatchableObserver.attach_all(_handlers); The declaration of _handlers in babble_patch.ck:line(76): > Handler @ _handlers[]; The declaration of the Handler class in babble_patch.ck:line(37): > class Handler extends PatchableObserver { ... } And the declaration of attach_all in patchable_observer.ck:line(16): > fun static void attach_all(PatchableObserver ps[]) { ... } What I *intend* is to pass an array of Handler objects to attach_all(). I can imagine that ChucK is concerned that Handler isn't the same as PatchableObject (don't laugh at me -- I've gotten used to Ruby's duck typing). But I can't figure out the syntax for casting an array of Handler[] as an array of PatchableObject[] to pass to attach_all(). Any ideas? [If need be I can make a smaller self-contained example. But my hope is that this is some easily answered question.] Thanks in advance, - Rob

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Complete and utter Newbie
by James Mcwilliam 19 Mar '10

19 Mar '10

Hi I just came across ChucK after dabbling with SC, Common Music and Max/MSP. I basically know nothing about programming but ChucK looks very interesting and I'd like to know more. I've download the executable file (Mac OS 10.6.2) and I've dropped the folder "chuck-1.2.1.3-exe' into applications. I've followed the instructions and opened the terminal and now I'm stuck..... The instructions say go to bin/directory (replace chuck-x.x.x.x.-exe with the directory name). What and where is bin/directory? You'll have to forgive my complete stupidity, I'm an 'acoustic composer' trying to dabble with electronic based music and so far i cant even install ChucK. Messing around with my terminal seems scary, am I likely to blow my computer up?? Any help would be greatly appreciated. Many Thanks James

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creating midi ports without connecting
by Atte André Jensen 13 Mar '10

13 Mar '10

Hi The following is from "polyfony.ck": // device to open (see: chuck --probe) 0 => int device; // get from command line if( me.args() ) me.arg(0) => Std.atoi => device; MidiIn min; MidiMsg msg; // try to open MIDI port (see chuck --probe for available devices) if( !min.open( device ) ) me.exit(); I see and use this all the time; creating midi out/in ports by connecting to something. But how can I create a midi port that's not connected to anything? -- Atte http://atte.dk http://modlys.dk

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sending out midiClock
by Atte André Jensen 12 Mar '10

12 Mar '10

Hi I'm trying to manipulate a stream of midi clock messages with a chuck script, but fail. Below is a stripped down example that just sends the received messages out again: MidiIn min; MidiOut mout; MidiMsg msg; if (!min.open(0)) me.exit(); if (!mout.open(4)) me.exit(); while(true){ min => now; while( min.recv(msg)) { <<<msg.data1>>>; mout.send(msg); } } However, when I send it a stream of midi clock messages it prints the following: 248 :(int) [chuck](via RtMidi): RtMidiOut::sendMessage: event parsing error! 248 :(int) [chuck](via RtMidi): RtMidiOut::sendMessage: event parsing error! 248 :(int) [chuck](via RtMidi): RtMidiOut::sendMessage: event parsing error! 248 :(int) [chuck](via RtMidi): RtMidiOut::sendMessage: event parsing error! It doesn't seem to send anything out mout. Am I doing something wrong? -- Atte http://atte.dk http://modlys.dk

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sndbuf glitch
by Scott Smallwood 09 Mar '10

09 Mar '10

Hey ChucKians, So, I've talked to some of you about this problem before, and have been given various solutions, including playing with chunking, but so far, nothing has been able to resolve this basic issue. It's really kept me from doing any significant work with sound buffers ChucK. Here's the issue: When you read a file into a sound buffer - doesn't matter how large the file is, the audio "clicks". Doesn't matter what else is currently "playing", whether it's an oscillator, another sndbuff, etc - it just invariably clicks. Case and point: ---- SndBuf s1 => dac; SndBuf s2 => dac; 0 => s2.gain; //turn down the gain of 2 so you can hear the click "file1.aif" => s1.read; 2::second => now; "file2.aif" => s2.read; 2::second => now; ---- So, this script starts playing the first file, then in 2 seconds when it loads "file2.aif" into the other SndBuf (who's gain is turned town) - CLICK! I know - this can be resolved by loading all needed soundbufs at the top of the code, but this is very restrictive. I want to be able to load in new audio on-the-fly - but currently, Chuck simply doesn't seem to support this basic feature. Anybody have any clues here? --ss [ - ] - [ - ] - [ - ] - [ - ] - [ - ] - [ - ] - [ - ] - [ - ] - [ - ] S c o t t S m a l l w o o d composer, sound artist faculty of arts, u of alberta scott.smallwood(a)ualberta.ca http://www.scott-smallwood.com http://www.ecnedive.com

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Why doesn't this work?
by Matt B. 09 Mar '10

09 Mar '10

Hey guys I'm trying to do a simple chuckle, but something's going wrong when I try to set s.freq... SinOsc s=>dac;Phasor p=>blackhole;p.freq(2);while(1){Math.sqrt(1/p.last())*100=>s.freq;10::ms=>now;}; If I dump "Math.sqrt(1/p.last())*100" I get floating values as expected between 100 and 700, but when I chuck it to s.freq, no sound is output, and s.last() is always 0. Am I missing something or is this a bug?

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Balinese gamelan gongs
by Hans Aberg 07 Mar '10

07 Mar '10

This link discusses the synthesizing of some Balinese gamelan gongs: http://mt.music.mcgill.ca/~lembkes/ Some of them are pretty good. - Might be great for ChucK, if there now is available formula for it. :-) Hans

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Simple question about getting a basic frequency spectrum
by v bar 05 Mar '10

05 Mar '10

Hi, I am a little confused with fourier-transforms, math not being my specialty. In essence all I am trying to do is take 1 second samples of an audio file and print out coordinates as follows: - amplitude at 80Hz, amplitude at 200Hz, amplitude at 1000Hz I have set up a file connecting: SndBuf buf => dac; buf => FFT fft => blackhole; And now I assume that I set the fft.size to 1024 samples (for a 44k 16bit audio file) and then upchuck that every 1024 samples. Most likely my error is there... But now I don't know how to get at the correct output. I have a ton of polar values but I don't really know what any of them correspond to. Some sample values: "time: 0:5000.0000" : (string) %(0.0140,-0.9985*pi) %(0.0004,-0.6629*pi) %(0.0001,-0.4812*pi) %(0.0001,-0.4412*pi) %(0.0001,-0.7007*pi) %(0.0001,-0.7549*pi) %(0.0001,-0.5928*pi) %(0.0000,0.7277*pi) %(0.0000,0.0000*pi) %(0.0000,0.0000*pi) %(0.0000,0.0000*pi) %(0.0000,0.0000*pi) "time: 0:6000.0000" : (string) %(0.0189,0.0008*pi) %(0.0003,0.4507*pi) %(0.0001,0.2899*pi) %(0.0001,0.2122*pi) %(0.0001,0.3072*pi) %(0.0000,0.5483*pi) %(0.0001,0.1053*pi) %(0.0000,0.2292*pi) %(0.0000,0.0000*pi) %(0.0000,0.0000*pi) %(0.0000,0.0000*pi) %(0.0000,0.0000*pi) "time: 0:7000.0000" : (string) %(0.0148,0.9997*pi) %(0.0002,0.4662*pi) %(0.0002,0.1996*pi) %(0.0001,0.4250*pi) %(0.0001,0.2651*pi) %(0.0001,0.4396*pi) %(0.0000,0.9036*pi) %(0.0001,0.4967*pi) %(0.0000,0.0000*pi) %(0.0000,0.0000*pi) %(0.0000,0.0000*pi) %(0.0000,0.0000*pi) Can someone help? I bet this is actually pretty simple I just can't seem to figure it out. I understand the notion of polar coordinates and know how I can convert them to Cartesian. But what I am not understanding is where I find out what the actual frequencies that are being sampled are... Thanks - J -- ---- vomc8one(a)gmail.com ----

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ChucK users group at SoundCloud
by Szilveszter Tóth 01 Mar '10

01 Mar '10

Hi All, If you are a SoundCloud user, feel free to join the ChucK users' group at SoundCloud: http://soundcloud.com/groups/chuck-users Best, Szilveszter (Hillaby)

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