/[svn]/linuxsampler/trunk/src/engines/gig/EGADSR.cpp
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revision 738 by schoenebeck, Tue Aug 16 17:14:25 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    #include "../../common/global_private.h"
27    
28  namespace LinuxSampler { namespace gig {  namespace LinuxSampler { namespace gig {
29    
30      EGADSR::EGADSR() {      EGADSR::EGADSR() {
# Line 32  namespace LinuxSampler { namespace gig { Line 34  namespace LinuxSampler { namespace gig {
34      }      }
35    
36      void EGADSR::CalculateFadeOutCoeff(float FadeOutTime, float SampleRate) {      void EGADSR::CalculateFadeOutCoeff(float FadeOutTime, float SampleRate) {
37          const float killSteps = FadeOutTime * SampleRate;          const float killSteps = FadeOutTime * SampleRate / CONFIG_DEFAULT_SUBFRAGMENT_SIZE;
38          FadeOutCoeff = -1.0f / killSteps;          FadeOutCoeff = -1.0f / killSteps;
39      }      }
40    
41      void EGADSR::update(event_t Event, double SamplePos, float CurrentPitch, uint SampleRate) {      void EGADSR::update(event_t Event, uint SampleRate) {
42            if (Event == event_hold_end) HoldAttack = false;
43    
44          switch (Stage) {          switch (Stage) {
45              case stage_attack:              case stage_attack:
46                  if (StepsLeft) {                  switch (Event) {
47                      PostponedEvent = Event;                      case event_release:
                 } else {  
                     if (Event == event_release)  
                         enterReleasePart1Stage();  
                     else if (Event == event_cancel_release)  
                         enterSustainStage();  
                     else if (PostponedEvent == event_release)  
48                          enterReleasePart1Stage();                          enterReleasePart1Stage();
49                      else if (PostponedEvent == event_cancel_release)                          break;
50                        case event_cancel_release:
51                          enterSustainStage();                          enterSustainStage();
52                      else if (HoldAttack)                          break;
53                          enterAttackHoldStage(SamplePos, CurrentPitch);                      case event_stage_end:
54                      else                          if (HoldAttack)
55                          enterDecay1Part1Stage(SampleRate);                              enterAttackHoldStage();
56                            else
57                                enterDecay1Part1Stage(SampleRate);
58                            break;
59                  }                  }
60                  break;                  break;
61              case stage_attack_hold:              case stage_attack_hold:
62                  switch (Event) {                  switch (Event) {
63                      case event_stage_end:                      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;
67                        }
68                        case event_hold_end:
69                          enterDecay1Part1Stage(SampleRate);                          enterDecay1Part1Stage(SampleRate);
70                          break;                          break;
71                      case event_release:                      case event_release:
# Line 74  namespace LinuxSampler { namespace gig { Line 81  namespace LinuxSampler { namespace gig {
81                  break;                  break;
82              case stage_decay1_part1:              case stage_decay1_part1:
83                  switch (Event) {                  switch (Event) {
84                      case stage_end:                      case event_stage_end:
85                          enterDecay1Part2Stage();                          enterDecay1Part2Stage(SampleRate);
86                          break;                          break;
87                      case event_release:                      case event_release:
88                          enterReleasePart1Stage();                          enterReleasePart1Stage();
# Line 95  namespace LinuxSampler { namespace gig { Line 102  namespace LinuxSampler { namespace gig {
102                          break;                          break;
103                      case event_stage_end: // fall through                      case event_stage_end: // fall through
104                      case event_cancel_release:                      case event_cancel_release:
105                          if (InfiniteSustain)                          if (Level < CONFIG_EG_BOTTOM)
106                                enterEndStage();
107                            else if (InfiniteSustain)
108                              enterSustainStage();                              enterSustainStage();
109                          else                          else
110                              enterDecay2Stage(SampleRate);                              enterDecay2Stage(SampleRate);
# Line 110  namespace LinuxSampler { namespace gig { Line 119  namespace LinuxSampler { namespace gig {
119                      case event_release:                      case event_release:
120                          enterReleasePart1Stage();                          enterReleasePart1Stage();
121                          break;                          break;
122                        case event_hold_end:
123                            enterDecay1Part1Stage(SampleRate);
124                            break;
125                  }                  }
126                  break;                  break;
127              case stage_sustain:              case stage_sustain:
# Line 122  namespace LinuxSampler { namespace gig { Line 134  namespace LinuxSampler { namespace gig {
134                      case event_release:                      case event_release:
135                          enterReleasePart1Stage();                          enterReleasePart1Stage();
136                          break;                          break;
137                        case event_hold_end:
138                            enterDecay1Part1Stage(SampleRate);
139                            break;
140                  }                  }
141                  break;                  break;
142              case stage_release_part1:              case stage_release_part1:
# Line 160  namespace LinuxSampler { namespace gig { Line 175  namespace LinuxSampler { namespace gig {
175          }          }
176      }      }
177    
178      void EGADSR::trigger(uint PreAttack, float AttackTime, bool HoldAttack, long LoopStart, float Decay1Time, double Decay2Time, bool InfiniteSustain, uint SustainLevel, float ReleaseTime, float Volume, uint SampleRate) {      void EGADSR::trigger(uint PreAttack, float AttackTime, bool HoldAttack, float Decay1Time, double Decay2Time, bool InfiniteSustain, uint SustainLevel, float ReleaseTime, float Volume, uint SampleRate) {
179            this->SustainLevel     = SustainLevel / 1000.0;
         enterAttackStage(PreAttack, AttackTime, SampleRate, 0.0, 1.0f);  
   
         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;  
182    
183          this->Decay1Time = Decay1Time;          this->Decay1Time = Decay1Time;
184          this->Decay2Time = Decay2Time;          this->Decay2Time = Decay2Time;
# Line 191  namespace LinuxSampler { namespace gig { Line 195  namespace LinuxSampler { namespace gig {
195          ReleaseCoeff2 = exp(ReleaseSlope);          ReleaseCoeff2 = exp(ReleaseSlope);
196          ReleaseCoeff3 = ExpOffset * (1 - ReleaseCoeff2);          ReleaseCoeff3 = ExpOffset * (1 - ReleaseCoeff2);
197          ReleaseLevel2 = 0.25 * invVolume;          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, const double SamplePos, const float CurrentPitch) {      void EGADSR::enterAttackStage(const uint PreAttack, const float AttackTime, const uint SampleRate) {
203          Stage   = stage_attack;          Stage   = stage_attack;
204          Segment = segment_lin;          Segment = segment_lin;
205          // Measurements of GSt output shows that the real attack time  
206          // is about 65.5% of the value specified in the gig file.          if (AttackTime >= 0.0005f) {
207          StepsLeft = (int) (0.655f * AttackTime * SampleRate);              // Measurements of GSt output shows that the real attack time
208          if (StepsLeft) {              // 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;              Level = (float) PreAttack / 1000.0;
212              Coeff = 0.896f * (1.0f - Level) / StepsLeft; // 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
213          } else { // immediately jump to the next stage          } else { // attack is zero - immediately jump to the next stage
214              if (HoldAttack) enterAttackHoldStage(SamplePos, CurrentPitch);              Level = 1.029f; // a bit higher than max sustain
215                if (HoldAttack) enterAttackHoldStage();
216              else            enterDecay1Part1Stage(SampleRate);              else            enterDecay1Part1Stage(SampleRate);
217          }          }
         PostponedEvent = (event_t) -1; // init with anything except release or cancel_release  
218      }      }
219    
220      void EGADSR::enterAttackHoldStage(const double SamplePos, const float CurrentPitch) {      void EGADSR::enterAttackHoldStage() {
221          Stage     = stage_attack_hold;          Stage     = stage_attack_hold;
222          Segment   = segment_lin;          Segment   = segment_lin;
223          Coeff     = 0.0f; // don't rise anymore          Coeff     = 0.0f; // don't rise anymore
224          StepsLeft = (int) (LoopStart - SamplePos / CurrentPitch); // FIXME: just an approximation, inaccuracy grows with higher audio fragment size, sufficient for usual fragment sizes though          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) {      void EGADSR::enterDecay1Part1Stage(const uint SampleRate) {
# Line 227  namespace LinuxSampler { namespace gig { Line 236  namespace LinuxSampler { namespace gig {
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);          StepsLeft = (int) (Decay1Time * SampleRate);
239          if (StepsLeft && SustainLevel < 1.0) {          if (StepsLeft && Level > SustainLevel) {
240              Stage        = stage_decay1_part1;              Stage        = stage_decay1_part1;
241              Segment      = segment_lin;              Segment      = segment_lin;
242              Decay1Slope  = 1.365 * (SustainLevel - 1.0) / StepsLeft;              Decay1Slope = (1.347f * SustainLevel - 1.361f) / StepsLeft;
243              Coeff        = Decay1Slope * invVolume;              Coeff        = Decay1Slope * invVolume;
244              Decay1Level2 = 0.25 * invVolume;              Decay1Level2 = 0.25 * invVolume;
245              StepsLeft    = int((RTMath::Max(Decay1Level2, SustainLevel) - Level) / Coeff);              StepsLeft = int((RTMath::Max(Decay1Level2, SustainLevel) - Level) / Coeff);
246                if (StepsLeft <= 0) enterDecay1Part2Stage(SampleRate);
247          } else {          } else {
             Level = SustainLevel;  
248              if (InfiniteSustain) enterSustainStage();              if (InfiniteSustain) enterSustainStage();
249              else                 enterDecay2Stage(SampleRate);              else                 enterDecay2Stage(SampleRate);
250          }          }
251      }      }
252    
253      void EGADSR::enterDecay1Part2Stage() {      void EGADSR::enterDecay1Part2Stage(const uint SampleRate) {
254          Stage   = stage_decay1_part2;          if (SustainLevel < Decay1Level2) {
255          Segment = segment_exp;              Stage   = stage_decay1_part2;
256          Decay1Slope *= 3.55;              Segment = segment_exp;
257          Coeff  = exp(Decay1Slope);              Decay1Slope *= 3.55;
258          Offset = ExpOffset * (1 - Coeff);              Coeff  = exp(Decay1Slope);
259          Level  = Decay1Level2;              Offset = ExpOffset * (1 - Coeff);
260          StepsLeft = int(log((SustainLevel - ExpOffset) / (Level - ExpOffset)) / Decay1Slope);              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      void EGADSR::enterDecay2Stage(const uint SampleRate) {      void EGADSR::enterDecay2Stage(const uint SampleRate) {
268          Stage      = stage_decay2;          Stage      = stage_decay2;
269          Segment    = segment_lin;          Segment    = segment_lin;
270          Decay2Time = RTMath::Max(Decay2Time, CONFIG_EG_MIN_RELEASE_TIME);          Decay2Time = RTMath::Max(Decay2Time, 0.05f);
271          StepsLeft  = (int) (Decay2Time * SampleRate);          StepsLeft  = (int) (Decay2Time * SampleRate);
272          Coeff      = (-1.03 / StepsLeft) * invVolume;          Coeff      = (-1.03 / StepsLeft) * invVolume;
273          //FIXME: do we really have to calculate 'StepsLeft' two times?          //FIXME: do we really have to calculate 'StepsLeft' two times?
274          StepsLeft  = int((CONFIG_EG_BOTTOM - Level) / Coeff);          StepsLeft  = int((CONFIG_EG_BOTTOM - Level) / Coeff);
275            if (StepsLeft <= 0) enterEndStage();
276      }      }
277    
278      void EGADSR::enterSustainStage() {      void EGADSR::enterSustainStage() {
# Line 274  namespace LinuxSampler { namespace gig { Line 288  namespace LinuxSampler { namespace gig {
288          Segment   = segment_lin;          Segment   = segment_lin;
289          StepsLeft = int((ReleaseLevel2 - Level) / ReleaseCoeff);          StepsLeft = int((ReleaseLevel2 - Level) / ReleaseCoeff);
290          Coeff     = ReleaseCoeff;          Coeff     = ReleaseCoeff;
291            if (StepsLeft <= 0) enterReleasePart2Stage();
292      }      }
293    
294      void EGADSR::enterReleasePart2Stage() {      void EGADSR::enterReleasePart2Stage() {
# Line 282  namespace LinuxSampler { namespace gig { Line 297  namespace LinuxSampler { namespace gig {
297          StepsLeft = int(log((CONFIG_EG_BOTTOM - ExpOffset) / (Level - ExpOffset)) / ReleaseSlope);          StepsLeft = int(log((CONFIG_EG_BOTTOM - ExpOffset) / (Level - ExpOffset)) / ReleaseSlope);
298          Coeff     = ReleaseCoeff2;          Coeff     = ReleaseCoeff2;
299          Offset    = ReleaseCoeff3;          Offset    = ReleaseCoeff3;
300            if (StepsLeft <= 0) enterFadeOutStage();
301      }      }
302    
303      void EGADSR::enterFadeOutStage() {      void EGADSR::enterFadeOutStage() {
# Line 289  namespace LinuxSampler { namespace gig { Line 305  namespace LinuxSampler { namespace gig {
305          Segment   = segment_lin;          Segment   = segment_lin;
306          StepsLeft = int(Level / (-FadeOutCoeff));          StepsLeft = int(Level / (-FadeOutCoeff));
307          Coeff     = FadeOutCoeff;          Coeff     = FadeOutCoeff;
308            if (StepsLeft <= 0) enterEndStage();
309      }      }
310    
311      void EGADSR::enterEndStage() {      void EGADSR::enterEndStage() {
312          Stage   = stage_end;          Stage   = stage_end;
313          Segment = segment_end;          Segment = segment_end;
314            Level   = 0;
315      }      }
316    
317  }} // namespace LinuxSampler::gig  }} // namespace LinuxSampler::gig
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