October 2006 - chuck-users - lists.cs.princeton.edu

TextMate bundle
by Tasmo 12 Oct '06

12 Oct '06

Hi ChucK on Mac users, I just finished my 1st version of a ChucK's language bundle for the popular editor Textmate (http://www.macromates.com/). The syntax file is based on Jesús Gollonet's Chuck jedit edit mode. Thank you Jesús! The bundle includes syntax highlighting, completition and basic ChucK remote through basic shortcuts. That means: You can start the Terminal.app with chuck in loop mode (I choosed 'chuck -l --bufsize 512'), add the actual file (without needing to save) (shortcut), remove last patch/programm (shortcut) and kill ChucK's engine. Please tell me if you wish to add some features and/or correct the syntax. The link to the first release: http://www.box.net/public/i2t4zjm4f3 Tom

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Sharing Instantiated Objects Thru Shreds
by Piero B. Contezini 11 Oct '06

11 Oct '06

Hello, Maybe i'm missing something, but I need to share a instantiated object between my shreds, as this object will control the music flow, I need all my shreds to share this instance. It works like this: Shred 1 controls the basic bass sequence Shred 2 controls the fx sequence There is a common class between them notifying each shred when they must change their random parameters (for sequencing everything in the right compasses), but the class itself doesn't work if it has no instance controlling the time poll interval, so in a programming language I should implement a shared memory area with mutexes to control the access of the main object, anyone had this problem before? I'm still figuring out how to put my ideas on Chuck, maybe i'm just doing something that's already done. Basicly i'm thinking this way because of the common way eletronic music is built on (8 beats as a word, 32 beats as phrase, and so on) In this way, I can't just add a new shred to the machine without being in the right compass (in a new phrase) , I could use timing, but I still want to make breaks (with effects of course) live, where I just set the main object to stop allowing the shreds to processes its next words/phrases , play the hole effect, and leave the control of the machine to the old shreds again. Is this just insane? Thanks Piero

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Re: [chuck-users] String concatenation
by Graham Coleman 09 Oct '06

09 Oct '06

Norman, There's currently no support for building strings - strings are immutable once they are initialized from literals. String ops have been in development, but are waiting garbage collection to be added. A workaround for your task is to generate a large literal array of filenames in text and index them: ["a.wav","b.wav","c.wav","d.wav","e.wav","f.wav","g.wav","h.wav", "i.wav","j.wav","k.wav","l.wav","m.wav","n.wav","o.wav","p.wav", "q.wav","r.wav","s.wav","t.wav","u.wav","v.wav","w.wav","x.wav", "y.wav","z.wav","aa.wav","bb.wav","cc.wav","dd.wav","ee.wav"] @=> string names[]; > By the way, I'm doing the split by elaborating on > > SndBuf ibuf; > "test.aif" => ibuf.read; > 0 => ibuf.pos; > > WvOut ofile; > "out0.aif" => ofile.aifFilename; > > ibuf => ofile => blackhole; > 2::second => now; > > ofile.closeFile; > > Does that look reasonable, or am I misunderstanding something (on a > few hours' acquaintance with ChucK)? You might need parens on the function call: ofile.closeFile(); best, Graham On Mon, 9 Oct 2006, Norman wrote: > Greetings. > > Is there any support for building up strings within ChucK? > > I'd like to do something like > > WvOut ofile; > 0 => int idx; > "out" + idx + ".aif" => ofile.aifFilename; > > I'm trying to produce a script which will split an input file into > short sections. I think I can see how to do most of it, but can't > work out how to generate file names. > > The "string" type is mentioned in passing in the 'type' section of > the manual, but with no indication of what methods it might have (I > tried "idx => ofile.append", but...). Googling for 'string' at > chuck.csc.princeton.edu doesn't indicate that I've missed anything > major. And I can't spot anything in the FAQ at <http:// > wiki.cs.princeton.edu/index.php/ChucK>, other than a `medium > priority' note `string operations' in <http://wiki.cs.princeton.edu/ > index.php/ChucK/Dev/DoThisNow>. Does this latter note mean that this > isn't possible, but might be soon? > > > Thanks for any pointers. > > Norman >

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sporking shreds, advancing time
by vb 08 Oct '06

08 Oct '06

hi all, i'm still struggling with the basics of chuck, it seems. let's say i have a process i want to have executed regularly, like a simple click of an impulse. is it more appropriate for chuck's liking to advance time inside the impulse function and spork it only once, or to spork the impulse function regularly? volker. // begin example 1 Impulse i => dac; fun void click() { while(true) { 1.0 => i.next; 0.5::second => now; } } spork ~click(); while( true ) 1::second => now; // end example 1 // begin example 2 Impulse i => dac; fun void click() { 1.0 => i.next; } while( true ) { spork ~click(); 0.5::second => now; } // end example 2

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String concatenation
by Norman Gray 05 Oct '06

05 Oct '06

Greetings. Is there any support for building up strings within ChucK? I'd like to do something like WvOut ofile; 0 => int idx; "out" + idx + ".aif" => ofile.aifFilename; I'm trying to produce a script which will split an input file into short sections. I think I can see how to do most of it, but can't work out how to generate file names. The "string" type is mentioned in passing in the 'type' section of the manual, but with no indication of what methods it might have (I tried "idx => ofile.append", but...). Googling for 'string' at chuck.csc.princeton.edu doesn't indicate that I've missed anything major. And I can't spot anything in the FAQ at <http:// wiki.cs.princeton.edu/index.php/ChucK>, other than a `medium priority' note `string operations' in <http://wiki.cs.princeton.edu/ index.php/ChucK/Dev/DoThisNow>. Does this latter note mean that this isn't possible, but might be soon? By the way, I'm doing the split by elaborating on SndBuf ibuf; "test.aif" => ibuf.read; 0 => ibuf.pos; WvOut ofile; "out0.aif" => ofile.aifFilename; ibuf => ofile => blackhole; 2::second => now; ofile.closeFile; Does that look reasonable, or am I misunderstanding something (on a few hours' acquaintance with ChucK)? Thanks for any pointers. Norman -- ------------------------------------------------------------------------ ---- Norman Gray / http://nxg.me.uk eurovotech.org / University of Leicester, UK

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mac intel audio i/o problem
by Manj Benning 03 Oct '06

03 Oct '06

hi i am running chuck 1.2.0.7 for the first time on my mac intel.And i keep getting the following problem when i try running the code below ------------------------ error msg: [chuck]: (via rtaudio): unable to open specified device(s) with given stream parameters: ... RtApiCore: unable to find OS-X audio stream on device (Apple: Built-in Microphone) for requested channels (2). [chuck]: cannot initialize audio device (try using --silent/-s) --------------------- code: --------------------- adc => dac; while( true ) { 100::ms => now; } ---------------------- when i do chuck --probe (output shown below) all devices, regardless if they are input (adc) or output (dac) are shown as dacs. With inputs channels set to 2 when the imic and line in are single channel devices. Whats up with this? And the built in mic on my laptop is working just fine when i check through the system prefs. thanks Manj ------------------------------- Macintosh-4:~/Documents/Development/chuck/code manj$ chuck --probe [chuck]: found 4 device(s) ... [chuck]: ------( chuck -- dac1 )--------------- [chuck]: device name = "Apple: Built-in Microphone" [chuck]: probe [success] ... [chuck]: # output channels = 0 [chuck]: # input channels = 2 [chuck]: # duplex Channels = 0 [chuck]: default device = NO [chuck]: natively supported data formats: [chuck]: 8-bit int [chuck]: 16-bit int [chuck]: 24-bit int [chuck]: 32-bit int [chuck]: 32-bit float [chuck]: 64-bit float [chuck]: supported sample rates: [chuck]: 44100 Hz [chuck]: 48000 Hz [chuck]: 88200 Hz [chuck]: 96000 Hz [chuck]: [chuck]: ------( chuck -- dac2 )--------------- [chuck]: device name = "Apple: Built-in Input" [chuck]: probe [success] ... [chuck]: # output channels = 0 [chuck]: # input channels = 2 [chuck]: # duplex Channels = 0 [chuck]: default device = NO [chuck]: natively supported data formats: [chuck]: 8-bit int [chuck]: 16-bit int [chuck]: 24-bit int [chuck]: 32-bit int [chuck]: 32-bit float [chuck]: 64-bit float [chuck]: supported sample rates: [chuck]: 44100 Hz [chuck]: 48000 Hz [chuck]: 88200 Hz [chuck]: 96000 Hz [chuck]: [chuck]: ------( chuck -- dac3 )--------------- [chuck]: device name = "Apple: Built-in Output" [chuck]: probe [success] ... [chuck]: # output channels = 2 [chuck]: # input channels = 0 [chuck]: # duplex Channels = 0 [chuck]: default device = YES [chuck]: natively supported data formats: [chuck]: 8-bit int [chuck]: 16-bit int [chuck]: 24-bit int [chuck]: 32-bit int [chuck]: 32-bit float [chuck]: 64-bit float [chuck]: supported sample rates: [chuck]: 44100 Hz [chuck]: 48000 Hz [chuck]: 88200 Hz [chuck]: 96000 Hz [chuck]: [chuck]: ------( chuck -- dac4 )--------------- [chuck]: device name = "Apple Computer, Inc.: Aggregate Device" [chuck]: probe [success] ... [chuck]: # output channels = 2 [chuck]: # input channels = 2 [chuck]: # duplex Channels = 2 [chuck]: default device = YES [chuck]: natively supported data formats: [chuck]: 8-bit int [chuck]: 16-bit int [chuck]: 24-bit int [chuck]: 32-bit int [chuck]: 32-bit float [chuck]: 64-bit float [chuck]: supported sample rates: [chuck]: 44100 Hz [chuck]: 48000 Hz [chuck]: 88200 Hz [chuck]: 96000 Hz [chuck]: [chuck]: ------( chuck -- 0 MIDI inputs )------ [chuck]: [chuck]: ------( chuck -- 0 MIDI outputs )----- [chuck]:

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constructing UGens by composition
by Graham Coleman 03 Oct '06

03 Oct '06

Object Orientaters, In languages like Java or ChucK, there are two OO ways to reuse code (besides copy-paste): by Inheritance: in this method, the class being defined is an elaborated version of the parent class (uses the extends command), like the way Orange is a special version of a Fruit by Composition: in this method, the class being defined is pieced together with instances of other classes, perhaps the way a Car class might be assembled with four instances of Wheel Now, if we wish to make a special version of a UGen by inheritance alone, we can already do this. By extending the UGen class you wish to use, you should be able to add or overwrite methods or variables. But what about composition? What if we wish to chain together several already useful into some compound effects object (for brevity's sake, perhaps)? public class StdFx extends UGen { //preconstructor PoleZero pz => NRev nrev => pan2 p; //dc filter - some STK synths need this pz.blockZero( 0.99 ); //no rev by default nrev.mix( 0.0 ); //random pan p.pan( std.rand2f( 0.1, 0.9 )); //omitted: controls for pan, rev, gain ... } This does the trick, basically. However, ChucK has no way of knowing that, to connect an object to StdFx, you connect its input to the PoleZero and the output from the pan2 into the output of this UGen. We must create a method to facilitate this: public void inOut( UGen in, UGen out ) { in => pz; p => out; } Which sort of breaks the flow in the calling program; sndbuf inst; StdFx stdfx; stdfx.inOut( inst, dac ); instead of just: snfbuf inst => StdFx stdfx => dac; So, to get the behavior we are going for in the language, it seems like the most direct way would be to specify an in and out reference for the correct UGens like so: public class StdFx extends UGen { //preconstructor PoleZero pz => NRev nrev => pan2 p; pz @=> this.in; p @=> this.out; //other stuff ... } So, will this kind of behavior be possible within the language as currently designed? I don't know. Most likely this behavior would stem from the implementation of Chuck_UGen::add( Chuck_UGen * src ) which is eventually executed by the VM on finding a => that resolves to a link operation. Offhand, we come up with two alternatives for producing this kind of behavior: 1. route link operations of a composite UGen in Chuck_UGen::add 2. some sample copying arrangement that would seem similar to linking So, what's the plan for supporting this? Graham

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