/[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 783 by persson, Sun Oct 2 14:40:52 2005 UTC
# Line 25  Line 25 
25    
26  namespace LinuxSampler { namespace gig {  namespace LinuxSampler { namespace gig {
27    
28      const float EGADSR::FadeOutCoeff(CalculateFadeOutCoeff());      EGADSR::EGADSR() {
29            enterEndStage();
     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;  
30          Level = 0.0;          Level = 0.0;
31            CalculateFadeOutCoeff(CONFIG_EG_MIN_RELEASE_TIME, 44100.0); // even if the sample rate will be 192kHz it won't hurt at all
32      }      }
33    
34      /**      void EGADSR::CalculateFadeOutCoeff(float FadeOutTime, float SampleRate) {
35       * Will be called by the voice for every audio fragment to let the EG          const float killSteps = FadeOutTime * SampleRate;
36       * queue it's modulation changes for the current audio fragment.          FadeOutCoeff = -1.0f / killSteps;
37       *      }
      * @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) {  
38    
39              // 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) {
40              if (itKillEvent && iSample >= Samples) Stage = stage_fadeout;          if (Event == event_hold_end) HoldAttack = false;
41    
42              switch (Stage) {          switch (Stage) {
43                  case stage_attack: {              case stage_attack:
44                      TriggerDelay = 0;                  switch (Event) {
45                      int to_process   = RTMath::Min(AttackStepsLeft, Samples - iSample);                      case event_release:
46                      int process_end  = iSample + to_process;                          enterReleasePart1Stage();
47                      AttackStepsLeft -= to_process;                          break;
48                      while (iSample < process_end) {                      case event_cancel_release:
49                          Level += AttackCoeff;                          enterSustainStage();
50                          pEngine->pSynthesisParameters[ModulationDestination][iSample++] *= Level;                          break;
51                      }                      case event_stage_end:
52                      if (iSample == TotalSamples && itTransitionEvent) { // postpone last transition event for the next audio fragment                          if (HoldAttack)
53                          RTList<Event>::Iterator itLastEvent = pEvents->last();                              enterAttackHoldStage();
54                          if (itLastEvent) ReleasePostponed = (itLastEvent->Type == Event::type_release);                          else
55                      }                              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;  
56                          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;  
57                  }                  }
58                  case stage_decay1_init: {                  break;
59                      if (Decay1StepsLeft) {              case stage_attack_hold:
60                          if (SustainLevel < 1.0) {                  switch (Event) {
61                              Decay1StepsLeft = int((RTMath::Max(Decay1Level2, SustainLevel) - Level) / Decay1Coeff);                      case event_stage_end: {// just refresh time
62                          } else {                          const int intMax = (unsigned int) -1 >> 1;
63                              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;  
64                          break;                          break;
65                      }                      }
66                      Stage = stage_decay1;                      case event_hold_end:
67                            enterDecay1Part1Stage(SampleRate);
68                            break;
69                        case event_release:
70                            enterReleasePart1Stage();
71                            break;
72                        case event_cancel_release:
73                            if (InfiniteSustain)
74                                enterSustainStage();
75                            else
76                                enterDecay1Part1Stage(SampleRate);
77                            break;
78                  }                  }
79                  case stage_decay1: {                  break;
80                      int to_process   = RTMath::Min(Samples - iSample, Decay1StepsLeft);              case stage_decay1_part1:
81                      int process_end  = iSample + to_process;                  switch (Event) {
82                      if (itTransitionEvent && itTransitionEvent->FragmentPos() <= process_end) {                      case event_stage_end:
83                          process_end       = itTransitionEvent->FragmentPos();                          enterDecay1Part2Stage(SampleRate);
84                          Stage             = (itTransitionEvent->Type == Event::type_release) ? stage_release_init : (InfiniteSustain) ? stage_sustain : stage_decay2_init;                          break;
85                          ++itTransitionEvent;                      case event_release:
86                      }                          enterReleasePart1Stage();
87                      else {                          break;
88                          Decay1StepsLeft -= to_process;                      case event_cancel_release:
89                          if (!Decay1StepsLeft) Stage = stage_decay1_part2_init;                          if (InfiniteSustain)
90                      }                              enterSustainStage();
91                      while (iSample < process_end) {                          else
92                          Level += Decay1Coeff;                              enterDecay2Stage(SampleRate);
93                          pEngine->pSynthesisParameters[ModulationDestination][iSample++] *= Level;                          break;
                     }  
                     break;  
94                  }                  }
95                  case stage_decay1_part2_init:                  break;
96                      Decay1StepsLeft = int(log((SustainLevel - ExpOffset) / (Level - ExpOffset)) / Decay1Slope);              case stage_decay1_part2:
97                      Stage = stage_decay1_part2;                  switch (Event) {
98                  case stage_decay1_part2: {                      case event_release:
99                      int to_process   = RTMath::Min(Samples - iSample, Decay1StepsLeft);                          enterReleasePart1Stage();
100                      int process_end  = iSample + to_process;                          break;
101                      if (itTransitionEvent && itTransitionEvent->FragmentPos() <= process_end) {                      case event_stage_end: // fall through
102                          process_end       = itTransitionEvent->FragmentPos();                      case event_cancel_release:
103                          Stage             = (itTransitionEvent->Type == Event::type_release) ? stage_release_init : (InfiniteSustain) ? stage_sustain : stage_decay2_init;                          if (Level < CONFIG_EG_BOTTOM)
104                          ++itTransitionEvent;                              enterEndStage();
105                      }                          else if (InfiniteSustain)
106                      else {                              enterSustainStage();
107                          Decay1StepsLeft -= to_process;                          else
108                          if (!Decay1StepsLeft) Stage = (InfiniteSustain) ? stage_sustain : stage_decay2_init;                              enterDecay2Stage(SampleRate);
109                      }                          break;
                     while (iSample < process_end) {  
                         Level = Level * Decay1Coeff2 + Decay1Coeff3;  
                         pEngine->pSynthesisParameters[ModulationDestination][iSample++] *= Level;  
                     }  
                     break;  
110                  }                  }
111                  case stage_decay2_init:                  break;
112                      Decay2StepsLeft = int((CONFIG_EG_BOTTOM - Level) / Decay2Coeff);              case stage_decay2:
113                      Stage = stage_decay2;                  switch (Event) {
114                  case stage_decay2: {                      case event_stage_end:
115                      int to_process   = RTMath::Min(Samples - iSample, Decay2StepsLeft);                          enterFadeOutStage();
116                      int process_end  = iSample + to_process;                          break;
117                      if (itTransitionEvent && itTransitionEvent->Type == Event::type_release && itTransitionEvent->FragmentPos() <= process_end) {                      case event_release:
118                          process_end       = itTransitionEvent->FragmentPos();                          enterReleasePart1Stage();
119                          ++itTransitionEvent;                          break;
120                          Stage             = stage_release_init; // switch to release stage soon                      case event_hold_end:
121                      }                          enterDecay1Part1Stage(SampleRate);
122                      else {                          break;
                         Decay2StepsLeft -= to_process;  
                         if (!Decay2StepsLeft) Stage = stage_fadeout;  
                     }  
                     while (iSample < process_end) {  
                         Level += Decay2Coeff;  
                         pEngine->pSynthesisParameters[ModulationDestination][iSample++] *= Level;  
                     }  
                     break;  
123                  }                  }
124                  case stage_sustain: {                  break;
125                      int process_end;              case stage_sustain:
126                      if (itTransitionEvent && itTransitionEvent->Type == Event::type_release && itTransitionEvent->FragmentPos() <= Samples) {                  switch (Event) {
127                          process_end       = itTransitionEvent->FragmentPos();                      case event_stage_end: {// just refresh time
128                          ++itTransitionEvent;                          const int intMax = (unsigned int) -1 >> 1;
129                          Stage             = stage_release_init; // switch to release stage soon                          StepsLeft = intMax; // we use the highest possible value
130                      }                          break;
                     else process_end = Samples;  
                     while (iSample < process_end) {  
                        pEngine->pSynthesisParameters[ModulationDestination][iSample++] *= Level;  
131                      }                      }
132                      break;                      case event_release:
133                            enterReleasePart1Stage();
134                            break;
135                        case event_hold_end:
136                            enterDecay1Part1Stage(SampleRate);
137                            break;
138                  }                  }
139                  case stage_release_init:                  break;
140                      ReleaseStepsLeft = int((ReleaseLevel2 - Level) / ReleaseCoeff);              case stage_release_part1:
141                      Stage = stage_release;                  switch (Event) {
142                  case stage_release: {                      case event_stage_end:
143                      int to_process   = RTMath::Min(Samples - iSample, ReleaseStepsLeft);                          enterReleasePart2Stage();
144                      int process_end  = iSample + to_process;                          break;
145                      if (itTransitionEvent && itTransitionEvent->Type == Event::type_cancel_release && itTransitionEvent->FragmentPos() <= process_end) {                      case event_cancel_release:
146                          process_end       = itTransitionEvent->FragmentPos();                          if (InfiniteSustain)
147                          ++itTransitionEvent;                              enterSustainStage();
148                          Stage             = (InfiniteSustain) ? stage_sustain : stage_decay2_init; // switch back to sustain / decay2 stage soon                          else
149                      }                              enterDecay2Stage(SampleRate);
150                      else {                          break;
                         ReleaseStepsLeft -= to_process;  
                         if (!ReleaseStepsLeft) Stage = stage_release_part2_init;  
                     }  
                     while (iSample < process_end) {  
                         Level += ReleaseCoeff;  
                         pEngine->pSynthesisParameters[ModulationDestination][iSample++] *= Level;  
                     }  
                     break;  
151                  }                  }
152                  case stage_release_part2_init:                  break;
153                      ReleaseStepsLeft = int(log((CONFIG_EG_BOTTOM - ExpOffset) / (Level - ExpOffset)) / ReleaseSlope);              case stage_release_part2:
154                      Stage = stage_release_part2;                  switch (Event) {
155                  case stage_release_part2: {                      case event_stage_end:
156                      int to_process   = RTMath::Min(Samples - iSample, ReleaseStepsLeft);                          enterFadeOutStage();
157                      int process_end  = iSample + to_process;                          break;
158                      if (itTransitionEvent && itTransitionEvent->Type == Event::type_cancel_release && itTransitionEvent->FragmentPos() <= process_end) {                      case event_cancel_release:
159                          process_end       = itTransitionEvent->FragmentPos();                          if (InfiniteSustain)
160                          ++itTransitionEvent;                              enterSustainStage();
161                          Stage             = (InfiniteSustain) ? stage_sustain : stage_decay2_init; // switch back to sustain / decay2 stage soon                          else
162                      }                              enterDecay2Stage(SampleRate);
163                      else {                          break;
                         ReleaseStepsLeft -= to_process;  
                         if (!ReleaseStepsLeft) Stage = stage_fadeout;  
                     }  
                     while (iSample < process_end) {  
                         Level = Level * ReleaseCoeff2 + ReleaseCoeff3;  
                         pEngine->pSynthesisParameters[ModulationDestination][iSample++] *= Level;  
                     }  
                     break;  
164                  }                  }
165                  case stage_fadeout: {                  break;
166                      int to_process   = RTMath::Min(int(Level / (-FadeOutCoeff)), TotalSamples - iSample);              case stage_fadeout:
167                      int process_end  = iSample + to_process;                  switch (Event) {
168                      while (iSample < process_end) {                      case event_stage_end:
169                          Level += FadeOutCoeff;                          enterEndStage();
170                          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;  
171                  }                  }
172              }                  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));  
173          }          }
         #endif // CONFIG_DEVMODE  
174      }      }
175    
176      /**      void EGADSR::trigger(uint PreAttack, float AttackTime, bool HoldAttack, float Decay1Time, double Decay2Time, bool InfiniteSustain, uint SustainLevel, float ReleaseTime, float Volume, uint SampleRate) {
177       * 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;  
         }  
178          this->InfiniteSustain  = InfiniteSustain;          this->InfiniteSustain  = InfiniteSustain;
179          this->HoldAttack       = HoldAttack;          this->HoldAttack       = HoldAttack;
         this->LoopStart        = LoopStart;  
         this->ReleasePostponed = false;  
180    
181          // calculate attack stage parameters (lin. curve)          this->Decay1Time = Decay1Time;
182            this->Decay2Time = Decay2Time;
183    
184            invVolume = 1 / Volume;
185            ExpOffset = (0.25 - 1 / 3.55) * invVolume;
186    
187            // calculate release stage parameters (lin+exp curve)
188            if (ReleaseTime < CONFIG_EG_MIN_RELEASE_TIME) ReleaseTime = CONFIG_EG_MIN_RELEASE_TIME;  // to avoid click sounds at the end of the sample playback
189            const float ReleaseStepsLeft = (long) (ReleaseTime * SampleRate);
190            ReleaseSlope  = 1.365 * (0 - 1) / ReleaseStepsLeft;
191            ReleaseCoeff  = ReleaseSlope * invVolume;
192            ReleaseSlope  *= 3.55;
193            ReleaseCoeff2 = exp(ReleaseSlope);
194            ReleaseCoeff3 = ExpOffset * (1 - ReleaseCoeff2);
195            ReleaseLevel2 = 0.25 * invVolume;
196    
197            enterAttackStage(PreAttack, AttackTime, SampleRate);
198        }
199    
200        void EGADSR::enterAttackStage(const uint PreAttack, const float AttackTime, const uint SampleRate) {
201            Stage   = stage_attack;
202            Segment = segment_lin;
203          // Measurements of GSt output shows that the real attack time          // Measurements of GSt output shows that the real attack time
204          // is about 65.5% of the value specified in the gig file.          // is about 65.5% of the value specified in the gig file.
205          AttackStepsLeft = (long) (0.655 * AttackTime * pEngine->pAudioOutputDevice->SampleRate());          StepsLeft = (int) (0.655f * AttackTime * SampleRate);
206          if (AttackStepsLeft) {          if (StepsLeft) {
207              Level       = (float) PreAttack / 1000.0;              Level = (float) PreAttack / 1000.0;
208              AttackCoeff = 0.896 * (1.0 - Level) / AttackStepsLeft; // max level is a bit lower if attack != 0              Coeff = 0.896f * (1.0f - Level) / StepsLeft; // max level is a bit lower if attack != 0
209          }          } else { // immediately jump to the next stage
210          else {              Level = 1.0;
211              Level       = 1.0;              if (HoldAttack) enterAttackHoldStage();
212              AttackCoeff = 0.0;              else            enterDecay1Part1Stage(SampleRate);
213          }          }
214        }
215    
216          const float invVolume = 1 / Volume;      void EGADSR::enterAttackHoldStage() {
217          ExpOffset = (0.25 - 1 / 3.55) * invVolume;          Stage     = stage_attack_hold;
218            Segment   = segment_lin;
219            Coeff     = 0.0f; // don't rise anymore
220            const int intMax = (unsigned int) -1 >> 1;
221            StepsLeft = intMax; // we use the highest value possible (we refresh StepsLeft in update() in case)
222        }
223    
224        void EGADSR::enterDecay1Part1Stage(const uint SampleRate) {
225          // The decay1 and release stage both consist of two parts,          // The decay1 and release stage both consist of two parts,
226          // first a linear curve, f, followed by an exponential curve,          // first a linear curve, f, followed by an exponential curve,
227          // g:          // g:
# Line 326  namespace LinuxSampler { namespace gig { Line 231  namespace LinuxSampler { namespace gig {
231          //          //
232          // (where d is 1/SampleRate). The transition from f to g is          // (where d is 1/SampleRate). The transition from f to g is
233          // done when f(x) has reached Level2 = 25% of full volume.          // done when f(x) has reached Level2 = 25% of full volume.
234            StepsLeft = (int) (Decay1Time * SampleRate);
235          // calculate decay1 stage parameters (lin+exp curve)          if (StepsLeft && SustainLevel < 1.0 && Level > SustainLevel) {
236          Decay1StepsLeft = (long) (Decay1Time * pEngine->pAudioOutputDevice->SampleRate());              Stage        = stage_decay1_part1;
237          if (Decay1StepsLeft) {              Segment      = segment_lin;
238              Decay1Slope  = 1.365 * (this->SustainLevel - 1.0) / Decay1StepsLeft;              Decay1Slope  = 1.365 * (SustainLevel - 1.0) / StepsLeft;
239              Decay1Coeff  = Decay1Slope * invVolume;              Coeff        = Decay1Slope * invVolume;
             Decay1Slope  *= 3.55;  
             Decay1Coeff2 = exp(Decay1Slope);  
             Decay1Coeff3 = ExpOffset * (1 - Decay1Coeff2);  
240              Decay1Level2 = 0.25 * invVolume;              Decay1Level2 = 0.25 * invVolume;
241                if (Level < Decay1Level2) enterDecay1Part2Stage(SampleRate);
242                else StepsLeft = int((RTMath::Max(Decay1Level2, SustainLevel) - Level) / Coeff);
243            } else {
244                if (InfiniteSustain) enterSustainStage();
245                else                 enterDecay2Stage(SampleRate);
246          }          }
247        }
248    
249          // calculate decay2 stage parameters (lin. curve)      void EGADSR::enterDecay1Part2Stage(const uint SampleRate) {
250          if (!InfiniteSustain) {          if (SustainLevel < Decay1Level2) {
251              if (Decay2Time < CONFIG_EG_MIN_RELEASE_TIME) Decay2Time = CONFIG_EG_MIN_RELEASE_TIME;              Stage   = stage_decay1_part2;
252              long Decay2Steps = (long) (Decay2Time * pEngine->pAudioOutputDevice->SampleRate());              Segment = segment_exp;
253              Decay2Coeff = (-1.03 / Decay2Steps) * invVolume;              Decay1Slope *= 3.55;
254                Coeff  = exp(Decay1Slope);
255                Offset = ExpOffset * (1 - Coeff);
256                StepsLeft = int(log((SustainLevel - ExpOffset) / (Level - ExpOffset)) / Decay1Slope);
257            } else {
258                if (InfiniteSustain) enterSustainStage();
259                else                 enterDecay2Stage(SampleRate);
260          }          }
261        }
262    
263          // calculate release stage parameters (lin+exp curve)      void EGADSR::enterDecay2Stage(const uint SampleRate) {
264          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;
265          ReleaseStepsLeft = (long) (ReleaseTime * pEngine->pAudioOutputDevice->SampleRate());          Segment    = segment_lin;
266          ReleaseSlope  = 1.365 * (0 - 1) / ReleaseStepsLeft;          Decay2Time = RTMath::Max(Decay2Time, CONFIG_EG_MIN_RELEASE_TIME);
267          ReleaseCoeff  = ReleaseSlope * invVolume;          StepsLeft  = (int) (Decay2Time * SampleRate);
268          ReleaseSlope  *= 3.55;          Coeff      = (-1.03 / StepsLeft) * invVolume;
269          ReleaseCoeff2 = exp(ReleaseSlope);          //FIXME: do we really have to calculate 'StepsLeft' two times?
270          ReleaseCoeff3 = ExpOffset * (1 - ReleaseCoeff2);          StepsLeft  = int((CONFIG_EG_BOTTOM - Level) / Coeff);
271          ReleaseLevel2 = 0.25 * invVolume;          if (StepsLeft == 0) enterEndStage();
272        }
273    
274        void EGADSR::enterSustainStage() {
275            Stage   = stage_sustain;
276            Segment = segment_lin;
277            Coeff   = 0.0f; // don't change the envelope level in this stage
278            const int intMax = (unsigned int) -1 >> 1;
279            StepsLeft = intMax; // we use the highest value possible (we refresh StepsLeft in update() in case)
280        }
281    
282        void EGADSR::enterReleasePart1Stage() {
283            Stage     = stage_release_part1;
284            Segment   = segment_lin;
285            StepsLeft = int((ReleaseLevel2 - Level) / ReleaseCoeff);
286            Coeff     = ReleaseCoeff;
287        }
288    
289        void EGADSR::enterReleasePart2Stage() {
290            Stage     = stage_release_part2;
291            Segment   = segment_exp;
292            StepsLeft = int(log((CONFIG_EG_BOTTOM - ExpOffset) / (Level - ExpOffset)) / ReleaseSlope);
293            Coeff     = ReleaseCoeff2;
294            Offset    = ReleaseCoeff3;
295        }
296    
297        void EGADSR::enterFadeOutStage() {
298            Stage     = stage_fadeout;
299            Segment   = segment_lin;
300            StepsLeft = int(Level / (-FadeOutCoeff));
301            Coeff     = FadeOutCoeff;
302            if (StepsLeft == 0) enterEndStage();
303        }
304    
305          dmsg(4,("PreAttack=%d, AttackLength=%d, AttackCoeff=%f, Decay1Coeff=%f, Decay2Coeff=%f, ReleaseLength=%d, ReleaseCoeff=%f\n",      void EGADSR::enterEndStage() {
306                  PreAttack, AttackStepsLeft, AttackCoeff, Decay1Coeff, Decay2Coeff, ReleaseStepsLeft, ReleaseCoeff));          Stage   = stage_end;
307            Segment = segment_end;
308      }      }
309    
310  }} // namespace LinuxSampler::gig  }} // namespace LinuxSampler::gig
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