/[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 2055 by persson, Sat Jan 30 10:30:02 2010 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 - 2010 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());  
   
     float EGADSR::CalculateFadeOutCoeff() {  
         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;  
     }  
   
     EGADSR::EGADSR(gig::Engine* pEngine, Event::destination_t ModulationDestination) {  
         this->pEngine = pEngine;  
         this->ModulationDestination = ModulationDestination;  
         Stage = stage_end;  
         Level = 0.0;  
     }  
27    
28      /**  namespace LinuxSampler { namespace gig {
      * Will be called by the voice for every audio fragment to let the EG  
      * queue it's modulation changes for the current audio fragment.  
      *  
      * @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  
29    
30          while (iSample < TotalSamples) {      void EGADSR::update(event_t Event, uint SampleRate) {
31            if (atEnd(Event)) return;
32    
33              // if the voice was killed in this fragment and we already processed the time before this kill event          if (Event == event_hold_end) HoldAttack = false;
             if (itKillEvent && iSample >= Samples) Stage = stage_fadeout;  
34    
35              switch (Stage) {          switch (Stage) {
36                  case stage_attack: {              case stage_attack:
37                      TriggerDelay = 0;                  switch (Event) {
38                      int to_process   = RTMath::Min(AttackStepsLeft, Samples - iSample);                      case event_release:
39                      int process_end  = iSample + to_process;                          enterReleasePart1Stage();
                     AttackStepsLeft -= to_process;  
                     while (iSample < process_end) {  
                         Level += AttackCoeff;  
                         pEngine->pSynthesisParameters[ModulationDestination][iSample++] *= Level;  
                     }  
                     if (iSample == TotalSamples && itTransitionEvent) { // postpone last transition event for the next audio fragment  
                         RTList<Event>::Iterator itLastEvent = pEvents->last();  
                         if (itLastEvent) ReleasePostponed = (itLastEvent->Type == Event::type_release);  
                     }  
                     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;  
40                          break;                          break;
41                      }                      case event_stage_end:
42                      int holdstepsleft = (int) (LoopStart - SamplePos / CurrentPitch); // FIXME: just an approximation, inaccuracy grows with higher audio fragment size, sufficient for usual fragment sizes though                          if (HoldAttack)
43                      int to_process    = RTMath::Min(holdstepsleft, Samples - iSample);                              enterAttackHoldStage();
44                      int process_end   = iSample + to_process;                          else
45                      if (itTransitionEvent && itTransitionEvent->FragmentPos() <= process_end) {                              enterDecay1Part1Stage(SampleRate);
                         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;  
                 }  
                 case stage_decay1_init: {  
                     if (Decay1StepsLeft) {  
                         if (SustainLevel < 1.0) {  
                             Decay1StepsLeft = int((RTMath::Max(Decay1Level2, SustainLevel) - Level) / Decay1Coeff);  
                         } else {  
                             Stage = (InfiniteSustain) ? stage_sustain : stage_decay2_init;  
                             break;  
                         }  
                     } else {  
                         Level = SustainLevel;  
                         Stage = (InfiniteSustain) ? stage_sustain : stage_decay2_init;  
46                          break;                          break;
                     }  
                     Stage = stage_decay1;  
47                  }                  }
48                  case stage_decay1: {                  break;
49                      int to_process   = RTMath::Min(Samples - iSample, Decay1StepsLeft);              case stage_attack_hold:
50                      int process_end  = iSample + to_process;                  switch (Event) {
51                      if (itTransitionEvent && itTransitionEvent->FragmentPos() <= process_end) {                      case event_stage_end: {// just refresh time
52                          process_end       = itTransitionEvent->FragmentPos();                          const int intMax = (unsigned int) -1 >> 1;
53                          Stage             = (itTransitionEvent->Type == Event::type_release) ? stage_release_init : (InfiniteSustain) ? stage_sustain : stage_decay2_init;                          StepsLeft = intMax; // we use the highest possible value
54                          ++itTransitionEvent;                          break;
                     }  
                     else {  
                         Decay1StepsLeft -= to_process;  
                         if (!Decay1StepsLeft) Stage = stage_decay1_part2_init;  
                     }  
                     while (iSample < process_end) {  
                         Level += Decay1Coeff;  
                         pEngine->pSynthesisParameters[ModulationDestination][iSample++] *= Level;  
55                      }                      }
56                      break;                      case event_hold_end:
57                            enterDecay1Part1Stage(SampleRate);
58                            break;
59                        case event_release:
60                            enterReleasePart1Stage();
61                            break;
62                  }                  }
63                  case stage_decay1_part2_init:                  break;
64                      Decay1StepsLeft = int(log((SustainLevel - ExpOffset) / (Level - ExpOffset)) / Decay1Slope);              case stage_decay1_part1:
65                      Stage = stage_decay1_part2;                  switch (Event) {
66                  case stage_decay1_part2: {                      case event_stage_end:
67                      int to_process   = RTMath::Min(Samples - iSample, Decay1StepsLeft);                          enterDecay1Part2Stage(SampleRate);
68                      int process_end  = iSample + to_process;                          break;
69                      if (itTransitionEvent && itTransitionEvent->FragmentPos() <= process_end) {                      case event_release:
70                          process_end       = itTransitionEvent->FragmentPos();                          enterReleasePart1Stage();
71                          Stage             = (itTransitionEvent->Type == Event::type_release) ? stage_release_init : (InfiniteSustain) ? stage_sustain : stage_decay2_init;                          break;
                         ++itTransitionEvent;  
                     }  
                     else {  
                         Decay1StepsLeft -= to_process;  
                         if (!Decay1StepsLeft) Stage = (InfiniteSustain) ? stage_sustain : stage_decay2_init;  
                     }  
                     while (iSample < process_end) {  
                         Level = Level * Decay1Coeff2 + Decay1Coeff3;  
                         pEngine->pSynthesisParameters[ModulationDestination][iSample++] *= Level;  
                     }  
                     break;  
72                  }                  }
73                  case stage_decay2_init:                  break;
74                      Decay2StepsLeft = int((CONFIG_EG_BOTTOM - Level) / Decay2Coeff);              case stage_decay1_part2:
75                      Stage = stage_decay2;                  switch (Event) {
76                  case stage_decay2: {                      case event_release:
77                      int to_process   = RTMath::Min(Samples - iSample, Decay2StepsLeft);                          enterReleasePart1Stage();
78                      int process_end  = iSample + to_process;                          break;
79                      if (itTransitionEvent && itTransitionEvent->Type == Event::type_release && itTransitionEvent->FragmentPos() <= process_end) {                      case event_stage_end:
80                          process_end       = itTransitionEvent->FragmentPos();                          if (Level < CONFIG_EG_BOTTOM)
81                          ++itTransitionEvent;                              enterEndStage();
82                          Stage             = stage_release_init; // switch to release stage soon                          else if (InfiniteSustain)
83                      }                              enterSustainStage();
84                      else {                          else
85                          Decay2StepsLeft -= to_process;                              enterDecay2Stage(SampleRate);
86                          if (!Decay2StepsLeft) Stage = stage_fadeout;                          break;
                     }  
                     while (iSample < process_end) {  
                         Level += Decay2Coeff;  
                         pEngine->pSynthesisParameters[ModulationDestination][iSample++] *= Level;  
                     }  
                     break;  
87                  }                  }
88                  case stage_sustain: {                  break;
89                      int process_end;              case stage_decay2:
90                      if (itTransitionEvent && itTransitionEvent->Type == Event::type_release && itTransitionEvent->FragmentPos() <= Samples) {                  switch (Event) {
91                          process_end       = itTransitionEvent->FragmentPos();                      case event_stage_end:
92                          ++itTransitionEvent;                          enterFadeOutStage();
93                          Stage             = stage_release_init; // switch to release stage soon                          break;
94                      }                      case event_release:
95                      else process_end = Samples;                          enterReleasePart1Stage();
96                      while (iSample < process_end) {                          break;
97                         pEngine->pSynthesisParameters[ModulationDestination][iSample++] *= Level;                      case event_hold_end:
98                      }                          enterDecay1Part1Stage(SampleRate);
99                      break;                          break;
100                  }                  }
101                  case stage_release_init:                  break;
102                      ReleaseStepsLeft = int((ReleaseLevel2 - Level) / ReleaseCoeff);              case stage_sustain:
103                      Stage = stage_release;                  switch (Event) {
104                  case stage_release: {                      case event_stage_end: {// just refresh time
105                      int to_process   = RTMath::Min(Samples - iSample, ReleaseStepsLeft);                          const int intMax = (unsigned int) -1 >> 1;
106                      int process_end  = iSample + to_process;                          StepsLeft = intMax; // we use the highest possible value
107                      if (itTransitionEvent && itTransitionEvent->Type == Event::type_cancel_release && itTransitionEvent->FragmentPos() <= process_end) {                          break;
                         process_end       = itTransitionEvent->FragmentPos();  
                         ++itTransitionEvent;  
                         Stage             = (InfiniteSustain) ? stage_sustain : stage_decay2_init; // switch back to sustain / decay2 stage soon  
                     }  
                     else {  
                         ReleaseStepsLeft -= to_process;  
                         if (!ReleaseStepsLeft) Stage = stage_release_part2_init;  
                     }  
                     while (iSample < process_end) {  
                         Level += ReleaseCoeff;  
                         pEngine->pSynthesisParameters[ModulationDestination][iSample++] *= Level;  
108                      }                      }
109                      break;                      case event_release:
110                            enterReleasePart1Stage();
111                            break;
112                        case event_hold_end:
113                            enterDecay1Part1Stage(SampleRate);
114                            break;
115                  }                  }
116                  case stage_release_part2_init:                  break;
117                      ReleaseStepsLeft = int(log((CONFIG_EG_BOTTOM - ExpOffset) / (Level - ExpOffset)) / ReleaseSlope);              case stage_release_part1:
118                      Stage = stage_release_part2;                  switch (Event) {
119                  case stage_release_part2: {                      case event_stage_end:
120                      int to_process   = RTMath::Min(Samples - iSample, ReleaseStepsLeft);                          enterReleasePart2Stage();
121                      int process_end  = iSample + to_process;                          break;
122                      if (itTransitionEvent && itTransitionEvent->Type == Event::type_cancel_release && itTransitionEvent->FragmentPos() <= process_end) {                      case event_cancel_release:
123                          process_end       = itTransitionEvent->FragmentPos();                          if (InfiniteSustain)
124                          ++itTransitionEvent;                              enterSustainStage();
125                          Stage             = (InfiniteSustain) ? stage_sustain : stage_decay2_init; // switch back to sustain / decay2 stage soon                          else
126                      }                              enterDecay2Stage(SampleRate);
127                      else {                          break;
                         ReleaseStepsLeft -= to_process;  
                         if (!ReleaseStepsLeft) Stage = stage_fadeout;  
                     }  
                     while (iSample < process_end) {  
                         Level = Level * ReleaseCoeff2 + ReleaseCoeff3;  
                         pEngine->pSynthesisParameters[ModulationDestination][iSample++] *= Level;  
                     }  
                     break;  
128                  }                  }
129                  case stage_fadeout: {                  break;
130                      int to_process   = RTMath::Min(int(Level / (-FadeOutCoeff)), TotalSamples - iSample);              case stage_release_part2:
131                      int process_end  = iSample + to_process;                  switch (Event) {
132                      while (iSample < process_end) {                      case event_stage_end:
133                          Level += FadeOutCoeff;                          enterFadeOutStage();
134                          pEngine->pSynthesisParameters[ModulationDestination][iSample++] *= Level;                          break;
135                      }                      case event_cancel_release:
136                      Stage = stage_end;                          if (InfiniteSustain)
137                      if (Level > -FadeOutCoeff) dmsg(1,("EGADSR: Warning, final fade out level too high, may result in click sound!\n"));                              enterSustainStage();
138                  } //Fall through here instead of breaking otherwise we can get back into stage_fadeout and loop forever!                          else
139                  case stage_end: {                              enterDecay2Stage(SampleRate);
140                      while (iSample < TotalSamples) {                          break;
                         pEngine->pSynthesisParameters[ModulationDestination][iSample++] = 0.0f;  
                     }  
                     break;  
141                  }                  }
142              }                  break;
143          }          }
   
         #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));  
         }  
         #endif // CONFIG_DEVMODE  
144      }      }
145    
146      /**      void EGADSR::trigger(uint PreAttack, float AttackTime, bool HoldAttack, float Decay1Time, double Decay2Time, bool InfiniteSustain, uint SustainLevel, float ReleaseTime, float Volume, uint SampleRate) {
147       * 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;  
         }  
148          this->InfiniteSustain  = InfiniteSustain;          this->InfiniteSustain  = InfiniteSustain;
149          this->HoldAttack       = HoldAttack;          this->HoldAttack       = HoldAttack;
         this->LoopStart        = LoopStart;  
         this->ReleasePostponed = false;  
150    
151          // calculate attack stage parameters (lin. curve)          this->Decay1Time = Decay1Time;
152            this->Decay2Time = Decay2Time;
153    
154          // Measurements of GSt output shows that the real attack time          invVolume = 1 / Volume;
155          // is about 65.5% of the value specified in the gig file.          ExpOffset = (0.25 - 1 / 3.55) * invVolume;
156          AttackStepsLeft = (long) (0.655 * AttackTime * pEngine->pAudioOutputDevice->SampleRate());  
157          if (AttackStepsLeft) {          // calculate release stage parameters (lin+exp curve)
158              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
159              AttackCoeff = 0.896 * (1.0 - Level) / AttackStepsLeft; // max level is a bit lower if attack != 0          const float ReleaseStepsLeft = (long) (ReleaseTime * SampleRate);
160          }          ReleaseSlope  = 1.365 * (0 - 1) / ReleaseStepsLeft;
161          else {          ReleaseCoeff  = ReleaseSlope * invVolume;
162              Level       = 1.0;          ReleaseSlope  *= 3.55;
163              AttackCoeff = 0.0;          ReleaseCoeff2 = exp(ReleaseSlope);
164            ReleaseCoeff3 = ExpOffset * (1 - ReleaseCoeff2);
165            ReleaseLevel2 = 0.25 * invVolume;
166    
167            enterFirstStage();
168            enterAttackStage(PreAttack, AttackTime, SampleRate);
169        }
170    
171        void EGADSR::enterAttackStage(const uint PreAttack, const float AttackTime, const uint SampleRate) {
172            Stage   = stage_attack;
173            Segment = segment_lin;
174    
175            if (AttackTime >= 0.0005f) {
176                // Measurements of GSt output shows that the real attack time
177                // is about 65.5% of the value specified in the gig file.
178                // The minimum attack value used is 0.032.
179                StepsLeft = int(0.655f * RTMath::Max(AttackTime, 0.032f) * SampleRate);
180                Level = (float) PreAttack / 1000.0;
181                Coeff = 0.896f * (1.0f - Level) / StepsLeft; // max level is a bit lower if attack != 0
182            } else { // attack is zero - immediately jump to the next stage
183                Level = 1.029f; // a bit higher than max sustain
184                if (HoldAttack) enterAttackHoldStage();
185                else            enterDecay1Part1Stage(SampleRate);
186          }          }
187        }
188    
189          const float invVolume = 1 / Volume;      void EGADSR::enterAttackHoldStage() {
190          ExpOffset = (0.25 - 1 / 3.55) * invVolume;          Stage     = stage_attack_hold;
191            Segment   = segment_lin;
192            Coeff     = 0.0f; // don't rise anymore
193            const int intMax = (unsigned int) -1 >> 1;
194            StepsLeft = intMax; // we use the highest value possible (we refresh StepsLeft in update() in case)
195        }
196    
197        void EGADSR::enterDecay1Part1Stage(const uint SampleRate) {
198          // The decay1 and release stage both consist of two parts,          // The decay1 and release stage both consist of two parts,
199          // first a linear curve, f, followed by an exponential curve,          // first a linear curve, f, followed by an exponential curve,
200          // g:          // g:
# Line 326  namespace LinuxSampler { namespace gig { Line 204  namespace LinuxSampler { namespace gig {
204          //          //
205          // (where d is 1/SampleRate). The transition from f to g is          // (where d is 1/SampleRate). The transition from f to g is
206          // done when f(x) has reached Level2 = 25% of full volume.          // done when f(x) has reached Level2 = 25% of full volume.
207            StepsLeft = (int) (Decay1Time * SampleRate);
208          // calculate decay1 stage parameters (lin+exp curve)          if (StepsLeft && Level > SustainLevel) {
209          Decay1StepsLeft = (long) (Decay1Time * pEngine->pAudioOutputDevice->SampleRate());              Stage        = stage_decay1_part1;
210          if (Decay1StepsLeft) {              Segment      = segment_lin;
211              Decay1Slope  = 1.365 * (this->SustainLevel - 1.0) / Decay1StepsLeft;              Decay1Slope = (1.347f * SustainLevel - 1.361f) / StepsLeft;
212              Decay1Coeff  = Decay1Slope * invVolume;              Coeff        = Decay1Slope * invVolume;
             Decay1Slope  *= 3.55;  
             Decay1Coeff2 = exp(Decay1Slope);  
             Decay1Coeff3 = ExpOffset * (1 - Decay1Coeff2);  
213              Decay1Level2 = 0.25 * invVolume;              Decay1Level2 = 0.25 * invVolume;
214                StepsLeft = int((RTMath::Max(Decay1Level2, SustainLevel) - Level) / Coeff);
215                if (StepsLeft <= 0) enterDecay1Part2Stage(SampleRate);
216            } else {
217                if (InfiniteSustain) enterSustainStage();
218                else                 enterDecay2Stage(SampleRate);
219          }          }
220        }
221    
222          // calculate decay2 stage parameters (lin. curve)      void EGADSR::enterDecay1Part2Stage(const uint SampleRate) {
223          if (!InfiniteSustain) {          if (SustainLevel < Decay1Level2) {
224              if (Decay2Time < CONFIG_EG_MIN_RELEASE_TIME) Decay2Time = CONFIG_EG_MIN_RELEASE_TIME;              Stage   = stage_decay1_part2;
225              long Decay2Steps = (long) (Decay2Time * pEngine->pAudioOutputDevice->SampleRate());              Segment = segment_exp;
226              Decay2Coeff = (-1.03 / Decay2Steps) * invVolume;              Decay1Slope *= 3.55;
227                Coeff  = exp(Decay1Slope);
228                Offset = ExpOffset * (1 - Coeff);
229                StepsLeft = int(log((SustainLevel - ExpOffset) / (Level - ExpOffset)) / Decay1Slope);
230                if (StepsLeft > 0) return;
231          }          }
232            if (InfiniteSustain) enterSustainStage();
233            else                 enterDecay2Stage(SampleRate);
234        }
235    
236          // calculate release stage parameters (lin+exp curve)      void EGADSR::enterDecay2Stage(const uint SampleRate) {
237          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;
238          ReleaseStepsLeft = (long) (ReleaseTime * pEngine->pAudioOutputDevice->SampleRate());          Segment    = segment_lin;
239          ReleaseSlope  = 1.365 * (0 - 1) / ReleaseStepsLeft;          Decay2Time = RTMath::Max(Decay2Time, 0.05f);
240          ReleaseCoeff  = ReleaseSlope * invVolume;          StepsLeft  = (int) (Decay2Time * SampleRate);
241          ReleaseSlope  *= 3.55;          Coeff      = (-1.03 / StepsLeft) * invVolume;
242          ReleaseCoeff2 = exp(ReleaseSlope);          //FIXME: do we really have to calculate 'StepsLeft' two times?
243          ReleaseCoeff3 = ExpOffset * (1 - ReleaseCoeff2);          StepsLeft  = int((CONFIG_EG_BOTTOM - Level) / Coeff);
244          ReleaseLevel2 = 0.25 * invVolume;          if (StepsLeft <= 0) enterEndStage();
245        }
246    
247        void EGADSR::enterSustainStage() {
248            Stage   = stage_sustain;
249            Segment = segment_lin;
250            Coeff   = 0.0f; // don't change the envelope level in this stage
251            const int intMax = (unsigned int) -1 >> 1;
252            StepsLeft = intMax; // we use the highest value possible (we refresh StepsLeft in update() in case)
253        }
254    
255        void EGADSR::enterReleasePart1Stage() {
256            Stage     = stage_release_part1;
257            Segment   = segment_lin;
258            StepsLeft = int((ReleaseLevel2 - Level) / ReleaseCoeff);
259            Coeff     = ReleaseCoeff;
260            if (StepsLeft <= 0) enterReleasePart2Stage();
261        }
262    
263          dmsg(4,("PreAttack=%d, AttackLength=%d, AttackCoeff=%f, Decay1Coeff=%f, Decay2Coeff=%f, ReleaseLength=%d, ReleaseCoeff=%f\n",      void EGADSR::enterReleasePart2Stage() {
264                  PreAttack, AttackStepsLeft, AttackCoeff, Decay1Coeff, Decay2Coeff, ReleaseStepsLeft, ReleaseCoeff));          Stage     = stage_release_part2;
265            Segment   = segment_exp;
266            StepsLeft = int(log((CONFIG_EG_BOTTOM - ExpOffset) / (Level - ExpOffset)) / ReleaseSlope);
267            Coeff     = ReleaseCoeff2;
268            Offset    = ReleaseCoeff3;
269            if (StepsLeft <= 0) enterFadeOutStage();
270      }      }
271    
272  }} // namespace LinuxSampler::gig  }} // namespace LinuxSampler::gig
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