September 2007 - chuck-dev - lists.cs.princeton.edu

Envelope fixing
by Kassen 30 Sep '07

30 Sep '07

Dear devs, After a bug in Envelope was found I tried my hand at fixing it which brought yet more issues to the surface. I also tried to fix those but I'm not sure what this might now break so I'm out of my depth. Details and code are here; http://electro-music.com/forum/viewtopic.php?p=142167#142167 Documentation of the various things that went wrong with the official version are above that post. A copy of what I arrived at follows below, I hope this is of some use, if my code isn't I can at least say we now have a clearer image of exactly what the issue is and I had some fun. Yours, Kas. ================================================================== /***************************************************/ /*! \class Envelope \brief STK envelope base class. This class implements a simple envelope generator which is capable of ramping to a target value by a specified \e rate. It also responds to simple \e keyOn and \e keyOff messages, ramping to 1.0 on keyOn and to 0.0 on keyOff. by Perry R. Cook and Gary P. Scavone, 1995 - 2002. ---------------- This is a experimental "fixed" version by Kassen who doesn't speak C++. Don't use this for anything important untill the official devs have had a look at it, Don't say I didn't warn you. this is a modification on ugen_stk.cpp for chuck 1.2.1.0, which is covered by the GPL (and so so is this). */ /***************************************************/ #include <stdio.h> Envelope :: Envelope(void) : Stk() { target = (MY_FLOAT) 0.0; value = (MY_FLOAT) 0.0; rate = (MY_FLOAT) 0.001; m_target = 1.0; m_time = rate * Stk::sampleRate(); state = 0; } Envelope :: ~Envelope(void) { } void Envelope :: keyOn(void) { target = (MY_FLOAT) m_target; if (value != target) state = 1; setTime( m_time ); } void Envelope :: keyOff(void) { target = (MY_FLOAT) 0.0; if (value != target) state = 1; setTime( m_time ); } void Envelope :: setRate(MY_FLOAT aRate) { if (aRate < 0.0) { printf("[chuck](via Envelope): negative rates not allowed ... correcting!\n"); rate = -aRate; } else rate = aRate; m_time = (target - value) / (rate * Stk::sampleRate()); if( m_time < 0.0 ) m_time = -m_time; } void Envelope :: setTime(MY_FLOAT aTime) { if (aTime < 0.0) { printf("[chuck](via Envelope): negative times not allowed ... correcting!\n"); rate = (target -value) / (-aTime * Stk::sampleRate()); } else if( aTime == 0.0 ) rate = FLT_MAX; else rate = (target - value) / (aTime * Stk::sampleRate()); if (rate < 0.0 ) rate = -rate; m_time = aTime; if( m_time < 0.0 ) m_time = -m_time; } void Envelope :: setTarget(MY_FLOAT aTarget) { target = m_target = aTarget; if (value != target) state = 1; // set time setTime( m_time ); } void Envelope :: setValue(MY_FLOAT aValue) { state = 0; target = aValue; value = aValue; } int Envelope :: getState(void) const { return state; } MY_FLOAT Envelope :: tick(void) { if (state) { if (target > value) { value += rate; if (value >= target) { value = target; state = 0; } } else { value -= rate; if (value <= target) { value = target; state = 0; } } } return value; } MY_FLOAT *Envelope :: tick(MY_FLOAT *vec, unsigned int vectorSize) { for (unsigned int i=0; i<vectorSize; i++) vec[i] = tick(); return vec; } MY_FLOAT Envelope :: lastOut(void) const { return value; }

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TriOsc.width()
by Dean McNamee 26 Sep '07

26 Sep '07

>From looking at the code, since there was already an unused osc_cget_width I figured this was just missed, or is there any reason why you wouldn't want a width getter? Didn't test the patch at all but I figure it should work. Thanks very much for ChucK

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RtAudio 4.0.2
by Philippe Lamarche 13 Sep '07

13 Sep '07

Hi, I was able to replace RtAudio with the last version : RtAudio 4.02. As always, it's highly experimental, but I think it works. With version 4.02, I believe it would be possible to add channel offset (ie. use 4 channels, from 6 to 12) on the input and output. My experience so far has been that the blocking functionality is no longer is no longer supported, is this a problem? If anyone is interested, I could add something to the –channels –in –out option like –channels(channelN,offsetN) and wrap it with my ASIO build on electro-music.com. Thanks, Philippe.

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Compiling 1.2.1.0 with Visual Studio 2005
by Imre Kéri 13 Sep '07

13 Sep '07

Hi! Once in July 2007 there was some discussion about STL vectors issue with Visual Studio 2005 (thread: 'Asio Build and "Debug Assertion Failed" Error.'). It seems this is still not solved, I get this runtime error whenever I want to play a file with ChucK right at startup. Also, I get a compilation error: .\ugen_xxx.cpp(2590) : error C2440: 'initializing' : cannot convert from 'const char *' to 'char *' Is it planned to fix these problems? Regards, Imre

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