/[svn]/linuxsampler/trunk/src/engines/gig/EGDecay.cpp
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Diff of /linuxsampler/trunk/src/engines/gig/EGDecay.cpp

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revision 737 by schoenebeck, Mon Dec 13 00:46:42 2004 UTC revision 738 by schoenebeck, Tue Aug 16 17:14:25 2005 UTC
# Line 3  Line 3 
3   *   LinuxSampler - modular, streaming capable sampler                     *   *   LinuxSampler - modular, streaming capable sampler                     *
4   *                                                                         *   *                                                                         *
5   *   Copyright (C) 2003, 2004 by Benno Senoner and Christian Schoenebeck   *   *   Copyright (C) 2003, 2004 by Benno Senoner and Christian Schoenebeck   *
6     *   Copyright (C) 2005 Christian Schoenebeck                              *
7   *                                                                         *   *                                                                         *
8   *   This program is free software; you can redistribute it and/or modify  *   *   This library is free software; you can redistribute it and/or modify  *
9   *   it under the terms of the GNU General Public License as published by  *   *   it under the terms of the GNU General Public License as published by  *
10   *   the Free Software Foundation; either version 2 of the License, or     *   *   the Free Software Foundation; either version 2 of the License, or     *
11   *   (at your option) any later version.                                   *   *   (at your option) any later version.                                   *
12   *                                                                         *   *                                                                         *
13   *   This program is distributed in the hope that it will be useful,       *   *   This library is distributed in the hope that it will be useful,       *
14   *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *   *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
15   *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *   *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
16   *   GNU General Public License for more details.                          *   *   GNU General Public License for more details.                          *
17   *                                                                         *   *                                                                         *
18   *   You should have received a copy of the GNU General Public License     *   *   You should have received a copy of the GNU General Public License     *
19   *   along with this program; if not, write to the Free Software           *   *   along with this library; if not, write to the Free Software           *
20   *   Foundation, Inc., 59 Temple Place, Suite 330, Boston,                 *   *   Foundation, Inc., 59 Temple Place, Suite 330, Boston,                 *
21   *   MA  02111-1307  USA                                                   *   *   MA  02111-1307  USA                                                   *
22   ***************************************************************************/   ***************************************************************************/
# Line 24  Line 25 
25    
26  namespace LinuxSampler { namespace gig {  namespace LinuxSampler { namespace gig {
27    
28      EGDecay::EGDecay(gig::Engine* pEngine, Event::destination_t ModulationDestination) {      EGDecay::EGDecay() {
         this->ModulationDestination = ModulationDestination;  
         this->pEngine = pEngine;  
29      }      }
30    
31      /**      void EGDecay::trigger(float Depth, float DecayTime, unsigned int SampleRate) {
32       * Will be called by the voice for every audio fragment to let the EG          this->Level = Depth;
      * queue it's modulation changes for the current audio fragment.  
      *  
      * @param Samples - total number of sample points to be rendered in this  
      *                  audio fragment cycle by the audio engine  
      * @returns true if there was something to process  
      */  
     bool EGDecay::Process(uint Samples) {  
         if (!DecayStepsLeft) return false;  
   
         int iSample     = TriggerDelay;  
         int to_process  = RTMath::Min(Samples - iSample, DecayStepsLeft);  
         int process_end = iSample + to_process;  
         DecayStepsLeft -= to_process;  
         while (iSample < to_process) {  
             pEngine->pSynthesisParameters[ModulationDestination][iSample++] *= Level;  
             Level += DecayCoeff;  
         }  
         TriggerDelay = 0;  
   
         return true;  
     }  
   
     /**  
      * Will be called by the voice when the key / voice was triggered.  
      *  
      * @param Depth     - Initial level of the envelope  
      * @param DecayTime - Decay time of the envelope (0.000 - 10.000s)  
      * @param Delay     - Number of sample points triggering should be delayed.  
      */  
     void EGDecay::Trigger(float Depth, double DecayTime, uint Delay) {  
         this->TriggerDelay = Delay;  
         this->Level        = Depth;  
33    
34          // calculate decay parameters (lin. curve)          // calculate decay parameters (lin. curve)
35          DecayStepsLeft = (long) (DecayTime * pEngine->pAudioOutputDevice->SampleRate());          StepsLeft = (int) (DecayTime * SampleRate);
36          DecayCoeff     = (1.0 - Depth) / DecayStepsLeft;          Coeff     = (1.0f - Depth) / (float) StepsLeft;
37    
38          dmsg(4,("Depth=%d, DecayTime=%f\n", Depth, DecayTime));          dmsg(4,("Depth=%d, DecayTime=%f\n", Depth, DecayTime));
39      }      }
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