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

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revision 614 by persson, Mon Jun 6 16:54:20 2005 UTC revision 1424 by schoenebeck, Sun Oct 14 22:00:17 2007 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                              *   *   Copyright (C) 2005 - 2007 Christian Schoenebeck                       *
7   *                                                                         *   *                                                                         *
8   *   This program is free software; you can redistribute it and/or modify  *   *   This program 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  *
# Line 23  Line 23 
23    
24  #include "EGADSR.h"  #include "EGADSR.h"
25    
26  namespace LinuxSampler { namespace gig {  #include "../../common/global_private.h"
   
     const float EGADSR::FadeOutCoeff(CalculateFadeOutCoeff());  
27    
28      float EGADSR::CalculateFadeOutCoeff() {  namespace LinuxSampler { namespace gig {
         const float sampleRate = 44100.0; // even if the sample rate will be 192kHz it won't hurt at all  
         const float killSteps  = CONFIG_EG_MIN_RELEASE_TIME * sampleRate;  
         return -1.0f / killSteps;  
     }  
29    
30      EGADSR::EGADSR(gig::Engine* pEngine, Event::destination_t ModulationDestination) {      EGADSR::EGADSR() {
31          this->pEngine = pEngine;          enterEndStage();
         this->ModulationDestination = ModulationDestination;  
         Stage = stage_end;  
32          Level = 0.0;          Level = 0.0;
33            CalculateFadeOutCoeff(CONFIG_EG_MIN_RELEASE_TIME, 44100.0); // even if the sample rate will be 192kHz it won't hurt at all
34      }      }
35    
36      /**      void EGADSR::CalculateFadeOutCoeff(float FadeOutTime, float SampleRate) {
37       * Will be called by the voice for every audio fragment to let the EG          const float killSteps = FadeOutTime * SampleRate / CONFIG_DEFAULT_SUBFRAGMENT_SIZE;
38       * queue it's modulation changes for the current audio fragment.          FadeOutCoeff = -1.0f / killSteps;
39       *      }
      * @param TotalSamples  - total number of sample points to be rendered in this  
      *                        audio fragment cycle by the audio engine  
      * @param pEvents       - event list with "release" and "cancel release" events  
      * @param itTriggerEvent - event that caused triggering of the voice (only if  
      *                        the voice was triggered in the current audio  
      *                        fragment, NULL otherwise)  
      * @param SamplePos     - current playback position  
      * @param CurrentPitch  - current pitch value for playback  
      * @param itKillEvent   - (optional) event which caused this voice to be killed  
      */  
     void EGADSR::Process(uint TotalSamples, RTList<Event>* pEvents, RTList<Event>::Iterator itTriggerEvent, double SamplePos, double CurrentPitch, RTList<Event>::Iterator itKillEvent) {  
         // skip all events which occured before this voice was triggered  
         RTList<Event>::Iterator itTransitionEvent = (itTriggerEvent) ? ++itTriggerEvent : pEvents->first();  
   
         // if the voice was killed in this fragment we only process the time before this kill event, then switch to 'stage_fadeout'  
         int Samples = (itKillEvent) ? RTMath::Min(itKillEvent->FragmentPos(), pEngine->MaxFadeOutPos) : (int) TotalSamples;  
   
         int iSample = TriggerDelay;  
   
         #if CONFIG_DEVMODE  
         if (TriggerDelay > TotalSamples) { // just a sanity check for debugging  
             dmsg(1,("EGADSR: ERROR, TriggerDelay > Totalsamples\n"));  
             int* i = NULL;  
             (*i)++; // force a segfault  
         }  
         #endif // CONFIG_DEVMODE  
   
         while (iSample < TotalSamples) {  
40    
41              // if the voice was killed in this fragment and we already processed the time before this kill event      void EGADSR::update(event_t Event, uint SampleRate) {
42              if (itKillEvent && iSample >= Samples) Stage = stage_fadeout;          if (Event == event_hold_end) HoldAttack = false;
43    
44              switch (Stage) {          switch (Stage) {
45                  case stage_attack: {              case stage_attack:
46                      TriggerDelay = 0;                  switch (Event) {
47                      int to_process   = RTMath::Min(AttackStepsLeft, Samples - iSample);                      case event_release:
48                      int process_end  = iSample + to_process;                          enterReleasePart1Stage();
49                      AttackStepsLeft -= to_process;                          break;
50                      while (iSample < process_end) {                      case event_cancel_release:
51                          Level += AttackCoeff;                          enterSustainStage();
52                          pEngine->pSynthesisParameters[ModulationDestination][iSample++] *= Level;                          break;
53                      }                      case event_stage_end:
54                      if (iSample == TotalSamples && itTransitionEvent) { // postpone last transition event for the next audio fragment                          if (HoldAttack)
55                          RTList<Event>::Iterator itLastEvent = pEvents->last();                              enterAttackHoldStage();
56                          if (itLastEvent) ReleasePostponed = (itLastEvent->Type == Event::type_release);                          else
57                      }                              enterDecay1Part1Stage(SampleRate);
                     if (!AttackStepsLeft) Stage = (ReleasePostponed) ? stage_release_init : (HoldAttack) ? stage_attack_hold : stage_decay1_init;  
                     break;  
                 }  
                 case stage_attack_hold: {  
                     if (SamplePos >= LoopStart) {  
                         Stage = stage_decay1_init;  
58                          break;                          break;
                     }  
                     int holdstepsleft = (int) (LoopStart - SamplePos / CurrentPitch); // FIXME: just an approximation, inaccuracy grows with higher audio fragment size, sufficient for usual fragment sizes though  
                     int to_process    = RTMath::Min(holdstepsleft, Samples - iSample);  
                     int process_end   = iSample + to_process;  
                     if (itTransitionEvent && itTransitionEvent->FragmentPos() <= process_end) {  
                         process_end       = itTransitionEvent->FragmentPos();  
                         Stage             = (itTransitionEvent->Type == Event::type_release) ? stage_release_init : (InfiniteSustain) ? stage_sustain : stage_decay2_init;  
                         ++itTransitionEvent;  
                     }  
                     else if (to_process == holdstepsleft) Stage = stage_decay1_init;  
                     while (iSample < process_end) {  
                         pEngine->pSynthesisParameters[ModulationDestination][iSample++] *= Level;  
                     }  
                     break;  
59                  }                  }
60                  case stage_decay1_init: {                  break;
61                      if (Decay1StepsLeft) {              case stage_attack_hold:
62                          if (SustainLevel < 1.0) {                  switch (Event) {
63                              Decay1StepsLeft = int((RTMath::Max(Decay1Level2, SustainLevel) - Level) / Decay1Coeff);                      case event_stage_end: {// just refresh time
64                          } else {                          const int intMax = (unsigned int) -1 >> 1;
65                              Stage = (InfiniteSustain) ? stage_sustain : stage_decay2_init;                          StepsLeft = intMax; // we use the highest possible value
                             break;  
                         }  
                     } else {  
                         Level = SustainLevel;  
                         Stage = (InfiniteSustain) ? stage_sustain : stage_decay2_init;  
66                          break;                          break;
67                      }                      }
68                      Stage = stage_decay1;                      case event_hold_end:
69                            enterDecay1Part1Stage(SampleRate);
70                            break;
71                        case event_release:
72                            enterReleasePart1Stage();
73                            break;
74                        case event_cancel_release:
75                            if (InfiniteSustain)
76                                enterSustainStage();
77                            else
78                                enterDecay1Part1Stage(SampleRate);
79                            break;
80                  }                  }
81                  case stage_decay1: {                  break;
82                      int to_process   = RTMath::Min(Samples - iSample, Decay1StepsLeft);              case stage_decay1_part1:
83                      int process_end  = iSample + to_process;                  switch (Event) {
84                      if (itTransitionEvent && itTransitionEvent->FragmentPos() <= process_end) {                      case event_stage_end:
85                          process_end       = itTransitionEvent->FragmentPos();                          enterDecay1Part2Stage(SampleRate);
86                          Stage             = (itTransitionEvent->Type == Event::type_release) ? stage_release_init : (InfiniteSustain) ? stage_sustain : stage_decay2_init;                          break;
87                          ++itTransitionEvent;                      case event_release:
88                      }                          enterReleasePart1Stage();
89                      else {                          break;
90                          Decay1StepsLeft -= to_process;                      case event_cancel_release:
91                          if (!Decay1StepsLeft) Stage = stage_decay1_part2_init;                          if (InfiniteSustain)
92                      }                              enterSustainStage();
93                      while (iSample < process_end) {                          else
94                          Level += Decay1Coeff;                              enterDecay2Stage(SampleRate);
95                          pEngine->pSynthesisParameters[ModulationDestination][iSample++] *= Level;                          break;
                     }  
                     break;  
96                  }                  }
97                  case stage_decay1_part2_init:                  break;
98                      Decay1StepsLeft = int(log((SustainLevel - ExpOffset) / (Level - ExpOffset)) / Decay1Slope);              case stage_decay1_part2:
99                      Stage = stage_decay1_part2;                  switch (Event) {
100                  case stage_decay1_part2: {                      case event_release:
101                      int to_process   = RTMath::Min(Samples - iSample, Decay1StepsLeft);                          enterReleasePart1Stage();
102                      int process_end  = iSample + to_process;                          break;
103                      if (itTransitionEvent && itTransitionEvent->FragmentPos() <= process_end) {                      case event_stage_end: // fall through
104                          process_end       = itTransitionEvent->FragmentPos();                      case event_cancel_release:
105                          Stage             = (itTransitionEvent->Type == Event::type_release) ? stage_release_init : (InfiniteSustain) ? stage_sustain : stage_decay2_init;                          if (Level < CONFIG_EG_BOTTOM)
106                          ++itTransitionEvent;                              enterEndStage();
107                      }                          else if (InfiniteSustain)
108                      else {                              enterSustainStage();
109                          Decay1StepsLeft -= to_process;                          else
110                          if (!Decay1StepsLeft) Stage = (InfiniteSustain) ? stage_sustain : stage_decay2_init;                              enterDecay2Stage(SampleRate);
111                      }                          break;
                     while (iSample < process_end) {  
                         Level = Level * Decay1Coeff2 + Decay1Coeff3;  
                         pEngine->pSynthesisParameters[ModulationDestination][iSample++] *= Level;  
                     }  
                     break;  
112                  }                  }
113                  case stage_decay2_init:                  break;
114                      Decay2StepsLeft = int((CONFIG_EG_BOTTOM - Level) / Decay2Coeff);              case stage_decay2:
115                      Stage = stage_decay2;                  switch (Event) {
116                  case stage_decay2: {                      case event_stage_end:
117                      int to_process   = RTMath::Min(Samples - iSample, Decay2StepsLeft);                          enterFadeOutStage();
118                      int process_end  = iSample + to_process;                          break;
119                      if (itTransitionEvent && itTransitionEvent->Type == Event::type_release && itTransitionEvent->FragmentPos() <= process_end) {                      case event_release:
120                          process_end       = itTransitionEvent->FragmentPos();                          enterReleasePart1Stage();
121                          ++itTransitionEvent;                          break;
122                          Stage             = stage_release_init; // switch to release stage soon                      case event_hold_end:
123                      }                          enterDecay1Part1Stage(SampleRate);
124                      else {                          break;
                         Decay2StepsLeft -= to_process;  
                         if (!Decay2StepsLeft) Stage = stage_fadeout;  
                     }  
                     while (iSample < process_end) {  
                         Level += Decay2Coeff;  
                         pEngine->pSynthesisParameters[ModulationDestination][iSample++] *= Level;  
                     }  
                     break;  
125                  }                  }
126                  case stage_sustain: {                  break;
127                      int process_end;              case stage_sustain:
128                      if (itTransitionEvent && itTransitionEvent->Type == Event::type_release && itTransitionEvent->FragmentPos() <= Samples) {                  switch (Event) {
129                          process_end       = itTransitionEvent->FragmentPos();                      case event_stage_end: {// just refresh time
130                          ++itTransitionEvent;                          const int intMax = (unsigned int) -1 >> 1;
131                          Stage             = stage_release_init; // switch to release stage soon                          StepsLeft = intMax; // we use the highest possible value
132                      }                          break;
                     else process_end = Samples;  
                     while (iSample < process_end) {  
                        pEngine->pSynthesisParameters[ModulationDestination][iSample++] *= Level;  
133                      }                      }
134                      break;                      case event_release:
135                            enterReleasePart1Stage();
136                            break;
137                        case event_hold_end:
138                            enterDecay1Part1Stage(SampleRate);
139                            break;
140                  }                  }
141                  case stage_release_init:                  break;
142                      ReleaseStepsLeft = int((ReleaseLevel2 - Level) / ReleaseCoeff);              case stage_release_part1:
143                      Stage = stage_release;                  switch (Event) {
144                  case stage_release: {                      case event_stage_end:
145                      int to_process   = RTMath::Min(Samples - iSample, ReleaseStepsLeft);                          enterReleasePart2Stage();
146                      int process_end  = iSample + to_process;                          break;
147                      if (itTransitionEvent && itTransitionEvent->Type == Event::type_cancel_release && itTransitionEvent->FragmentPos() <= process_end) {                      case event_cancel_release:
148                          process_end       = itTransitionEvent->FragmentPos();                          if (InfiniteSustain)
149                          ++itTransitionEvent;                              enterSustainStage();
150                          Stage             = (InfiniteSustain) ? stage_sustain : stage_decay2_init; // switch back to sustain / decay2 stage soon                          else
151                      }                              enterDecay2Stage(SampleRate);
152                      else {                          break;
                         ReleaseStepsLeft -= to_process;  
                         if (!ReleaseStepsLeft) Stage = stage_release_part2_init;  
                     }  
                     while (iSample < process_end) {  
                         Level += ReleaseCoeff;  
                         pEngine->pSynthesisParameters[ModulationDestination][iSample++] *= Level;  
                     }  
                     break;  
153                  }                  }
154                  case stage_release_part2_init:                  break;
155                      ReleaseStepsLeft = int(log((CONFIG_EG_BOTTOM - ExpOffset) / (Level - ExpOffset)) / ReleaseSlope);              case stage_release_part2:
156                      Stage = stage_release_part2;                  switch (Event) {
157                  case stage_release_part2: {                      case event_stage_end:
158                      int to_process   = RTMath::Min(Samples - iSample, ReleaseStepsLeft);                          enterFadeOutStage();
159                      int process_end  = iSample + to_process;                          break;
160                      if (itTransitionEvent && itTransitionEvent->Type == Event::type_cancel_release && itTransitionEvent->FragmentPos() <= process_end) {                      case event_cancel_release:
161                          process_end       = itTransitionEvent->FragmentPos();                          if (InfiniteSustain)
162                          ++itTransitionEvent;                              enterSustainStage();
163                          Stage             = (InfiniteSustain) ? stage_sustain : stage_decay2_init; // switch back to sustain / decay2 stage soon                          else
164                      }                              enterDecay2Stage(SampleRate);
165                      else {                          break;
                         ReleaseStepsLeft -= to_process;  
                         if (!ReleaseStepsLeft) Stage = stage_fadeout;  
                     }  
                     while (iSample < process_end) {  
                         Level = Level * ReleaseCoeff2 + ReleaseCoeff3;  
                         pEngine->pSynthesisParameters[ModulationDestination][iSample++] *= Level;  
                     }  
                     break;  
166                  }                  }
167                  case stage_fadeout: {                  break;
168                      int to_process   = RTMath::Min(int(Level / (-FadeOutCoeff)), TotalSamples - iSample);              case stage_fadeout:
169                      int process_end  = iSample + to_process;                  switch (Event) {
170                      while (iSample < process_end) {                      case event_stage_end:
171                          Level += FadeOutCoeff;                          enterEndStage();
172                          pEngine->pSynthesisParameters[ModulationDestination][iSample++] *= Level;                          break;
                     }  
                     Stage = stage_end;  
                     if (Level > -FadeOutCoeff) dmsg(1,("EGADSR: Warning, final fade out level too high, may result in click sound!\n"));  
                 } //Fall through here instead of breaking otherwise we can get back into stage_fadeout and loop forever!  
                 case stage_end: {  
                     while (iSample < TotalSamples) {  
                         pEngine->pSynthesisParameters[ModulationDestination][iSample++] = 0.0f;  
                     }  
                     break;  
173                  }                  }
174              }                  break;
         }  
   
         #if CONFIG_DEVMODE  
         if (itKillEvent && Stage != stage_end) { // just a sanity check for debugging  
             dmsg(1,("EGADSR: ERROR, voice killing not completed !!!\n"));  
             dmsg(1,("EGADSR: Stage=%d,iSample=%d,Samples=%d, TotalSamples=%d, MaxFadoutPos=%d\n",Stage,iSample,Samples,TotalSamples,pEngine->MaxFadeOutPos));  
175          }          }
         #endif // CONFIG_DEVMODE  
176      }      }
177    
178      /**      void EGADSR::trigger(uint PreAttack, float AttackTime, bool HoldAttack, float Decay1Time, double Decay2Time, bool InfiniteSustain, uint SustainLevel, float ReleaseTime, float Volume, uint SampleRate) {
179       * Will be called by the voice when the key / voice was triggered.          this->SustainLevel     = SustainLevel / 1000.0;
      *  
      * @param PreAttack       - Preattack value for the envelope (0 - 1000 permille)  
      * @param AttackTime      - Attack time for the envelope (0.000 - 60.000s)  
      * @param HoldAttack      - If true, Decay1 will be postponed until the sample reached the sample loop start.  
      * @param LoopStart       - Sample position where sample loop starts (if any)  
      * @param Decay1Time      - Decay1 time of the sample amplitude EG (0.000 - 60.000s).  
      * @param Decay2Time      - Only if !InfiniteSustain: 2nd decay stage time of the sample amplitude EG (0.000 - 60.000s).  
      * @param InfiniteSustain - If true, instead of going into Decay2 phase, Decay1 level will be hold until note will be released.  
      * @param SustainLevel    - Sustain level of the sample amplitude EG (0 - 1000 permille).  
      * @param ReleaseTIme     - Release time for the envelope (0.000 - 60.000s)  
      * @param Delay           - Number of sample points triggering should be delayed.  
      * @param Volume          - Volume the sample will be played at (0.0 - 1.0). Used when calculating the exponential curve parameters.  
      */  
     void EGADSR::Trigger(uint PreAttack, double AttackTime, bool HoldAttack, long LoopStart, double Decay1Time, double Decay2Time, bool InfiniteSustain, uint SustainLevel, double ReleaseTime, uint Delay, float Volume) {  
         this->TriggerDelay     = Delay;  
         this->Stage            = stage_attack;  
         if (SustainLevel) {  
             this->SustainLevel = SustainLevel / 1000.0;  
         } else {  
             // sustain level 0 means that voice dies after decay 1  
             this->SustainLevel = CONFIG_EG_BOTTOM;  
             InfiniteSustain    = false;  
             Decay2Time         = CONFIG_EG_MIN_RELEASE_TIME;  
         }  
180          this->InfiniteSustain  = InfiniteSustain;          this->InfiniteSustain  = InfiniteSustain;
181          this->HoldAttack       = HoldAttack;          this->HoldAttack       = HoldAttack;
         this->LoopStart        = LoopStart;  
         this->ReleasePostponed = false;  
182    
183          // calculate attack stage parameters (lin. curve)          this->Decay1Time = Decay1Time;
184            this->Decay2Time = Decay2Time;
185    
186          // Measurements of GSt output shows that the real attack time          invVolume = 1 / Volume;
187          // is about 65.5% of the value specified in the gig file.          ExpOffset = (0.25 - 1 / 3.55) * invVolume;
188          AttackStepsLeft = (long) (0.655 * AttackTime * pEngine->pAudioOutputDevice->SampleRate());  
189          if (AttackStepsLeft) {          // calculate release stage parameters (lin+exp curve)
190              Level       = (float) PreAttack / 1000.0;          if (ReleaseTime < CONFIG_EG_MIN_RELEASE_TIME) ReleaseTime = CONFIG_EG_MIN_RELEASE_TIME;  // to avoid click sounds at the end of the sample playback
191              AttackCoeff = 0.896 * (1.0 - Level) / AttackStepsLeft; // max level is a bit lower if attack != 0          const float ReleaseStepsLeft = (long) (ReleaseTime * SampleRate);
192          }          ReleaseSlope  = 1.365 * (0 - 1) / ReleaseStepsLeft;
193          else {          ReleaseCoeff  = ReleaseSlope * invVolume;
194              Level       = 1.0;          ReleaseSlope  *= 3.55;
195              AttackCoeff = 0.0;          ReleaseCoeff2 = exp(ReleaseSlope);
196            ReleaseCoeff3 = ExpOffset * (1 - ReleaseCoeff2);
197            ReleaseLevel2 = 0.25 * invVolume;
198    
199            enterAttackStage(PreAttack, AttackTime, SampleRate);
200        }
201    
202        void EGADSR::enterAttackStage(const uint PreAttack, const float AttackTime, const uint SampleRate) {
203            Stage   = stage_attack;
204            Segment = segment_lin;
205    
206            if (AttackTime >= 0.0005f) {
207                // Measurements of GSt output shows that the real attack time
208                // is about 65.5% of the value specified in the gig file.
209                // The minimum attack value used is 0.032.
210                StepsLeft = int(0.655f * RTMath::Max(AttackTime, 0.032f) * SampleRate);
211                Level = (float) PreAttack / 1000.0;
212                Coeff = 0.896f * (1.0f - Level) / StepsLeft; // max level is a bit lower if attack != 0
213            } else { // attack is zero - immediately jump to the next stage
214                Level = 1.029f; // a bit higher than max sustain
215                if (HoldAttack) enterAttackHoldStage();
216                else            enterDecay1Part1Stage(SampleRate);
217          }          }
218        }
219    
220          const float invVolume = 1 / Volume;      void EGADSR::enterAttackHoldStage() {
221          ExpOffset = (0.25 - 1 / 3.55) * invVolume;          Stage     = stage_attack_hold;
222            Segment   = segment_lin;
223            Coeff     = 0.0f; // don't rise anymore
224            const int intMax = (unsigned int) -1 >> 1;
225            StepsLeft = intMax; // we use the highest value possible (we refresh StepsLeft in update() in case)
226        }
227    
228        void EGADSR::enterDecay1Part1Stage(const uint SampleRate) {
229          // The decay1 and release stage both consist of two parts,          // The decay1 and release stage both consist of two parts,
230          // first a linear curve, f, followed by an exponential curve,          // first a linear curve, f, followed by an exponential curve,
231          // g:          // g:
# Line 326  namespace LinuxSampler { namespace gig { Line 235  namespace LinuxSampler { namespace gig {
235          //          //
236          // (where d is 1/SampleRate). The transition from f to g is          // (where d is 1/SampleRate). The transition from f to g is
237          // done when f(x) has reached Level2 = 25% of full volume.          // done when f(x) has reached Level2 = 25% of full volume.
238            StepsLeft = (int) (Decay1Time * SampleRate);
239          // calculate decay1 stage parameters (lin+exp curve)          if (StepsLeft && Level > SustainLevel) {
240          Decay1StepsLeft = (long) (Decay1Time * pEngine->pAudioOutputDevice->SampleRate());              Stage        = stage_decay1_part1;
241          if (Decay1StepsLeft) {              Segment      = segment_lin;
242              Decay1Slope  = 1.365 * (this->SustainLevel - 1.0) / Decay1StepsLeft;              Decay1Slope = (1.347f * SustainLevel - 1.361f) / StepsLeft;
243              Decay1Coeff  = Decay1Slope * invVolume;              Coeff        = Decay1Slope * invVolume;
             Decay1Slope  *= 3.55;  
             Decay1Coeff2 = exp(Decay1Slope);  
             Decay1Coeff3 = ExpOffset * (1 - Decay1Coeff2);  
244              Decay1Level2 = 0.25 * invVolume;              Decay1Level2 = 0.25 * invVolume;
245                StepsLeft = int((RTMath::Max(Decay1Level2, SustainLevel) - Level) / Coeff);
246                if (StepsLeft <= 0) enterDecay1Part2Stage(SampleRate);
247            } else {
248                if (InfiniteSustain) enterSustainStage();
249                else                 enterDecay2Stage(SampleRate);
250          }          }
251        }
252    
253          // calculate decay2 stage parameters (lin. curve)      void EGADSR::enterDecay1Part2Stage(const uint SampleRate) {
254          if (!InfiniteSustain) {          if (SustainLevel < Decay1Level2) {
255              if (Decay2Time < CONFIG_EG_MIN_RELEASE_TIME) Decay2Time = CONFIG_EG_MIN_RELEASE_TIME;              Stage   = stage_decay1_part2;
256              long Decay2Steps = (long) (Decay2Time * pEngine->pAudioOutputDevice->SampleRate());              Segment = segment_exp;
257              Decay2Coeff = (-1.03 / Decay2Steps) * invVolume;              Decay1Slope *= 3.55;
258                Coeff  = exp(Decay1Slope);
259                Offset = ExpOffset * (1 - Coeff);
260                StepsLeft = int(log((SustainLevel - ExpOffset) / (Level - ExpOffset)) / Decay1Slope);
261                if (StepsLeft > 0) return;
262          }          }
263            if (InfiniteSustain) enterSustainStage();
264            else                 enterDecay2Stage(SampleRate);
265        }
266    
267          // calculate release stage parameters (lin+exp curve)      void EGADSR::enterDecay2Stage(const uint SampleRate) {
268          if (ReleaseTime < CONFIG_EG_MIN_RELEASE_TIME) ReleaseTime = CONFIG_EG_MIN_RELEASE_TIME;  // to avoid click sounds at the end of the sample playback          Stage      = stage_decay2;
269          ReleaseStepsLeft = (long) (ReleaseTime * pEngine->pAudioOutputDevice->SampleRate());          Segment    = segment_lin;
270          ReleaseSlope  = 1.365 * (0 - 1) / ReleaseStepsLeft;          Decay2Time = RTMath::Max(Decay2Time, 0.05f);
271          ReleaseCoeff  = ReleaseSlope * invVolume;          StepsLeft  = (int) (Decay2Time * SampleRate);
272          ReleaseSlope  *= 3.55;          Coeff      = (-1.03 / StepsLeft) * invVolume;
273          ReleaseCoeff2 = exp(ReleaseSlope);          //FIXME: do we really have to calculate 'StepsLeft' two times?
274          ReleaseCoeff3 = ExpOffset * (1 - ReleaseCoeff2);          StepsLeft  = int((CONFIG_EG_BOTTOM - Level) / Coeff);
275          ReleaseLevel2 = 0.25 * invVolume;          if (StepsLeft <= 0) enterEndStage();
276        }
277    
278        void EGADSR::enterSustainStage() {
279            Stage   = stage_sustain;
280            Segment = segment_lin;
281            Coeff   = 0.0f; // don't change the envelope level in this stage
282            const int intMax = (unsigned int) -1 >> 1;
283            StepsLeft = intMax; // we use the highest value possible (we refresh StepsLeft in update() in case)
284        }
285    
286        void EGADSR::enterReleasePart1Stage() {
287            Stage     = stage_release_part1;
288            Segment   = segment_lin;
289            StepsLeft = int((ReleaseLevel2 - Level) / ReleaseCoeff);
290            Coeff     = ReleaseCoeff;
291            if (StepsLeft <= 0) enterReleasePart2Stage();
292        }
293    
294        void EGADSR::enterReleasePart2Stage() {
295            Stage     = stage_release_part2;
296            Segment   = segment_exp;
297            StepsLeft = int(log((CONFIG_EG_BOTTOM - ExpOffset) / (Level - ExpOffset)) / ReleaseSlope);
298            Coeff     = ReleaseCoeff2;
299            Offset    = ReleaseCoeff3;
300            if (StepsLeft <= 0) enterFadeOutStage();
301        }
302    
303        void EGADSR::enterFadeOutStage() {
304            Stage     = stage_fadeout;
305            Segment   = segment_lin;
306            StepsLeft = int(Level / (-FadeOutCoeff));
307            Coeff     = FadeOutCoeff;
308            if (StepsLeft <= 0) enterEndStage();
309        }
310    
311          dmsg(4,("PreAttack=%d, AttackLength=%d, AttackCoeff=%f, Decay1Coeff=%f, Decay2Coeff=%f, ReleaseLength=%d, ReleaseCoeff=%f\n",      void EGADSR::enterEndStage() {
312                  PreAttack, AttackStepsLeft, AttackCoeff, Decay1Coeff, Decay2Coeff, ReleaseStepsLeft, ReleaseCoeff));          Stage   = stage_end;
313            Segment = segment_end;
314            Level   = 0;
315      }      }
316    
317  }} // namespace LinuxSampler::gig  }} // namespace LinuxSampler::gig
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