/[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 237 by senkov, Sun Sep 12 01:59:40 2004 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 - 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 22  Line 23 
23    
24  #include "EGADSR.h"  #include "EGADSR.h"
25    
26    #include "../../common/global_private.h"
27    
28  namespace LinuxSampler { namespace gig {  namespace LinuxSampler { namespace gig {
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 Samples       - 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 pTriggerEvent - event that caused triggering of the voice (only if  
      *                        the voices was triggered in the current audio  
      *                        fragment, NULL otherwise)  
      * @param SamplePos     - current playback position  
      * @param CurrentPitch  - current pitch value for playback  
      */  
     void EGADSR::Process(uint Samples, RTEList<Event>* pEvents, Event* pTriggerEvent, double SamplePos, double CurrentPitch) {  
         Event* pTransitionEvent;  
         if (pTriggerEvent) {  
             pEvents->set_current(pTriggerEvent);  
             pTransitionEvent = pEvents->next();  
         }  
         else {  
             pTransitionEvent = pEvents->first();  
         }  
40    
41          int iSample = TriggerDelay;      void EGADSR::update(event_t Event, uint SampleRate) {
42          while (iSample < Samples) {          if (Event == event_hold_end) HoldAttack = false;
43              switch (Stage) {  
44                  case stage_attack: {          switch (Stage) {
45                      TriggerDelay = 0;              case stage_attack:
46                      int to_process   = RTMath::Min(AttackStepsLeft, Samples - iSample);                  switch (Event) {
47                      int process_end  = iSample + to_process;                      case event_release:
48                      AttackStepsLeft -= to_process;                          enterReleasePart1Stage();
49                      while (iSample < process_end) {                          break;
50                          Level += AttackCoeff;                      case event_cancel_release:
51                          pEngine->pSynthesisParameters[ModulationDestination][iSample++] *= Level;                          enterSustainStage();
52                      }                          break;
53                      if (iSample == Samples) { // postpone last transition event for the next audio fragment                      case event_stage_end:
54                          Event* pLastEvent = pEvents->last();                          if (HoldAttack)
55                          if (pLastEvent) ReleasePostponed = (pLastEvent->Type == Event::type_release);                              enterAttackHoldStage();
56                      }                          else
57                      if (!AttackStepsLeft) Stage = (ReleasePostponed) ? stage_release : (HoldAttack) ? stage_attack_hold : stage_decay1;                              enterDecay1Part1Stage(SampleRate);
58                      break;                          break;
59                  }                  }
60                  case stage_attack_hold: {                  break;
61                      if (SamplePos >= LoopStart) {              case stage_attack_hold:
62                          Stage = stage_decay1;                  switch (Event) {
63                        case event_stage_end: {// just refresh time
64                            const int intMax = (unsigned int) -1 >> 1;
65                            StepsLeft = intMax; // we use the highest possible value
66                          break;                          break;
67                      }                      }
68                      int holdstepsleft = (int) (LoopStart - SamplePos / CurrentPitch); // FIXME: just an approximation, inaccuracy grows with higher audio fragment size, sufficient for usual fragment sizes though                      case event_hold_end:
69                      int to_process    = RTMath::Min(holdstepsleft, Samples - iSample);                          enterDecay1Part1Stage(SampleRate);
70                      int process_end   = iSample + to_process;                          break;
71                      if (pTransitionEvent && pTransitionEvent->FragmentPos() <= process_end) {                      case event_release:
72                          process_end      = pTransitionEvent->FragmentPos();                          enterReleasePart1Stage();
73                          Stage            = (pTransitionEvent->Type == Event::type_release) ? stage_release : (InfiniteSustain) ? stage_sustain : stage_decay2;                          break;
74                          pTransitionEvent = pEvents->next();                      case event_cancel_release:
75                      }                          if (InfiniteSustain)
76                      else if (to_process == holdstepsleft) Stage = stage_decay1;                              enterSustainStage();
77                      while (iSample < process_end) {                          else
78                          pEngine->pSynthesisParameters[ModulationDestination][iSample++] *= Level;                              enterDecay1Part1Stage(SampleRate);
79                      }                          break;
                     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 (pTransitionEvent && pTransitionEvent->FragmentPos() <= process_end) {                      case event_stage_end:
85                          process_end      = pTransitionEvent->FragmentPos();                          enterDecay1Part2Stage(SampleRate);
86                          Stage            = (pTransitionEvent->Type == Event::type_release) ? stage_release : (InfiniteSustain) ? stage_sustain : stage_decay2;                          break;
87                          pTransitionEvent = pEvents->next();                      case event_release:
88                      }                          enterReleasePart1Stage();
89                      else {                          break;
90                          Decay1StepsLeft -= to_process;                      case event_cancel_release:
91                          if (!Decay1StepsLeft) Stage = (InfiniteSustain) ? stage_sustain : stage_decay2;                          if (InfiniteSustain)
92                      }                              enterSustainStage();
93                      while (iSample < process_end) {                          else
94                          Level += Level * Decay1Coeff;                              enterDecay2Stage(SampleRate);
95                          pEngine->pSynthesisParameters[ModulationDestination][iSample++] *= Level;                          break;
                     }  
                     break;  
96                  }                  }
97                  case stage_decay2: {                  break;
98                      int process_end;              case stage_decay1_part2:
99                      if (pTransitionEvent && pTransitionEvent->Type == Event::type_release && pTransitionEvent->FragmentPos() <= Samples) {                  switch (Event) {
100                          process_end      = pTransitionEvent->FragmentPos();                      case event_release:
101                          pTransitionEvent = pEvents->next();                          enterReleasePart1Stage();
102                          Stage            = stage_release; // switch to release stage soon                          break;
103                      }                      case event_stage_end: // fall through
104                      else process_end = Samples;                      case event_cancel_release:
105                      while (iSample < process_end) {                          if (Level < CONFIG_EG_BOTTOM)
106                          Level += Level * Decay2Coeff;                              enterEndStage();
107                          pEngine->pSynthesisParameters[ModulationDestination][iSample++] *= Level;                          else if (InfiniteSustain)
108                      }                              enterSustainStage();
109                      if (Level <= EG_ENVELOPE_LIMIT) Stage = stage_end;                          else
110                      break;                              enterDecay2Stage(SampleRate);
111                            break;
112                  }                  }
113                  case stage_sustain: {                  break;
114                      int process_end;              case stage_decay2:
115                      if (pTransitionEvent && pTransitionEvent->Type == Event::type_release && pTransitionEvent->FragmentPos() <= Samples) {                  switch (Event) {
116                          process_end      = pTransitionEvent->FragmentPos();                      case event_stage_end:
117                          pTransitionEvent = pEvents->next();                          enterFadeOutStage();
118                          Stage            = stage_release; // switch to release stage soon                          break;
119                      }                      case event_release:
120                      else process_end = Samples;                          enterReleasePart1Stage();
121                      while (iSample < process_end) {                          break;
122                         pEngine->pSynthesisParameters[ModulationDestination][iSample++] *= Level;                      case event_hold_end:
123                      }                          enterDecay1Part1Stage(SampleRate);
124                      break;                          break;
125                  }                  }
126                  case stage_release: {                  break;
127                      int process_end;              case stage_sustain:
128                      if (pTransitionEvent && pTransitionEvent->Type == Event::type_cancel_release && pTransitionEvent->FragmentPos() <= Samples) {                  switch (Event) {
129                          process_end      = pTransitionEvent->FragmentPos();                      case event_stage_end: {// just refresh time
130                          pTransitionEvent = pEvents->next();                          const int intMax = (unsigned int) -1 >> 1;
131                          Stage            = (InfiniteSustain) ? stage_sustain : stage_decay2; // switch back to sustain / decay2 stage soon                          StepsLeft = intMax; // we use the highest possible value
132                      }                          break;
                     else process_end = Samples;  
                     while (iSample < process_end) {  
                         Level += Level * ReleaseCoeff;  
                         pEngine->pSynthesisParameters[ModulationDestination][iSample++] *= Level;  
133                      }                      }
134                      if (Level <= EG_ENVELOPE_LIMIT) Stage = stage_end;                      case event_release:
135                      break;                          enterReleasePart1Stage();
136                            break;
137                        case event_hold_end:
138                            enterDecay1Part1Stage(SampleRate);
139                            break;
140                  }                  }
141                  case stage_end: {                  break;
142                      while (iSample < Samples) {              case stage_release_part1:
143                          Level += Level * ReleaseCoeff;                  switch (Event) {
144                          pEngine->pSynthesisParameters[ModulationDestination][iSample++] *= Level;                      case event_stage_end:
145                      }                          enterReleasePart2Stage();
146                      break;                          break;
147                        case event_cancel_release:
148                            if (InfiniteSustain)
149                                enterSustainStage();
150                            else
151                                enterDecay2Stage(SampleRate);
152                            break;
153                    }
154                    break;
155                case stage_release_part2:
156                    switch (Event) {
157                        case event_stage_end:
158                            enterFadeOutStage();
159                            break;
160                        case event_cancel_release:
161                            if (InfiniteSustain)
162                                enterSustainStage();
163                            else
164                                enterDecay2Stage(SampleRate);
165                            break;
166                    }
167                    break;
168                case stage_fadeout:
169                    switch (Event) {
170                        case event_stage_end:
171                            enterEndStage();
172                            break;
173                  }                  }
174              }                  break;
175          }          }
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.  
      */  
     void EGADSR::Trigger(uint PreAttack, double AttackTime, bool HoldAttack, long LoopStart, double Decay1Time, double Decay2Time, bool InfiniteSustain, uint SustainLevel, double ReleaseTime, uint Delay) {  
         this->TriggerDelay     = Delay;  
         this->Stage            = stage_attack;  
         this->SustainLevel     = (SustainLevel) ? (SustainLevel > EG_ENVELOPE_LIMIT) ? (float) SustainLevel / 1000.0 : EG_ENVELOPE_LIMIT : 1.0;  
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          AttackStepsLeft = (long) (AttackTime * pEngine->pAudioOutputDevice->SampleRate());          this->Decay2Time = Decay2Time;
185          if (AttackStepsLeft) {  
186              Level       = (float) PreAttack / 1000.0;          invVolume = 1 / Volume;
187              AttackCoeff = (1.0 - Level) / AttackStepsLeft;          ExpOffset = (0.25 - 1 / 3.55) * invVolume;
188    
189            // calculate release stage parameters (lin+exp curve)
190            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            const float ReleaseStepsLeft = (long) (ReleaseTime * SampleRate);
192            ReleaseSlope  = 1.365 * (0 - 1) / ReleaseStepsLeft;
193            ReleaseCoeff  = ReleaseSlope * invVolume;
194            ReleaseSlope  *= 3.55;
195            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          else {      }
219              Level       = 1.0;  
220              AttackCoeff = 0.0;      void EGADSR::enterAttackHoldStage() {
221            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,
230            // first a linear curve, f, followed by an exponential curve,
231            // g:
232            //
233            // f(x + d) = f(x) + Coeff
234            // g(x + d) = Coeff2 * g(x) + Coeff3
235            //
236            // (where d is 1/SampleRate). The transition from f to g is
237            // done when f(x) has reached Level2 = 25% of full volume.
238            StepsLeft = (int) (Decay1Time * SampleRate);
239            if (StepsLeft && Level > SustainLevel) {
240                Stage        = stage_decay1_part1;
241                Segment      = segment_lin;
242                Decay1Slope = (1.347f * SustainLevel - 1.361f) / StepsLeft;
243                Coeff        = Decay1Slope * invVolume;
244                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 decay1 stage parameters (exp. curve)      void EGADSR::enterDecay1Part2Stage(const uint SampleRate) {
254          Decay1StepsLeft = (long) (Decay1Time * pEngine->pAudioOutputDevice->SampleRate());          if (SustainLevel < Decay1Level2) {
255          Decay1Coeff     = (Decay1StepsLeft) ? exp(log(this->SustainLevel) / (double) Decay1StepsLeft) - 1.0              Stage   = stage_decay1_part2;
256                                              : 0.0;              Segment = segment_exp;
257                Decay1Slope *= 3.55;
258          // calculate decay2 stage parameters (exp. curve)              Coeff  = exp(Decay1Slope);
259          if (!InfiniteSustain) {              Offset = ExpOffset * (1 - Coeff);
260              if (Decay2Time < EG_MIN_RELEASE_TIME) Decay2Time = EG_MIN_RELEASE_TIME;              StepsLeft = int(log((SustainLevel - ExpOffset) / (Level - ExpOffset)) / Decay1Slope);
261              long Decay2Steps = (long) (Decay2Time * pEngine->pAudioOutputDevice->SampleRate());              if (StepsLeft > 0) return;
             Decay2Coeff      = (Decay2Steps) ? exp((log(EG_ENVELOPE_LIMIT) - log(this->SustainLevel)) / Decay2Steps + log(this->SustainLevel)) - this->SustainLevel  
                                             : 0.0;  
262          }          }
263            if (InfiniteSustain) enterSustainStage();
264            else                 enterDecay2Stage(SampleRate);
265        }
266    
267        void EGADSR::enterDecay2Stage(const uint SampleRate) {
268            Stage      = stage_decay2;
269            Segment    = segment_lin;
270            Decay2Time = RTMath::Max(Decay2Time, 0.05f);
271            StepsLeft  = (int) (Decay2Time * SampleRate);
272            Coeff      = (-1.03 / StepsLeft) * invVolume;
273            //FIXME: do we really have to calculate 'StepsLeft' two times?
274            StepsLeft  = int((CONFIG_EG_BOTTOM - Level) / Coeff);
275            if (StepsLeft <= 0) enterEndStage();
276        }
277    
278          // calcuate release stage parameters (exp. curve)      void EGADSR::enterSustainStage() {
279          if (ReleaseTime < EG_MIN_RELEASE_TIME) ReleaseTime = EG_MIN_RELEASE_TIME;  // to avoid click sounds at the end of the sample playback          Stage   = stage_sustain;
280          ReleaseStepsLeft = (long) (ReleaseTime * pEngine->pAudioOutputDevice->SampleRate());          Segment = segment_lin;
281          ReleaseCoeff     = exp((log(EG_ENVELOPE_LIMIT) - log(this->SustainLevel)) / ReleaseStepsLeft + log(this->SustainLevel)) - this->SustainLevel;          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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