/[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 768 by persson, Fri Sep 2 20:11:55 2005 UTC revision 1046 by persson, Sat Feb 10 12:00:55 2007 UTC
# Line 32  namespace LinuxSampler { namespace gig { Line 32  namespace LinuxSampler { namespace gig {
32      }      }
33    
34      void EGADSR::CalculateFadeOutCoeff(float FadeOutTime, float SampleRate) {      void EGADSR::CalculateFadeOutCoeff(float FadeOutTime, float SampleRate) {
35          const float killSteps = FadeOutTime * SampleRate;          const float killSteps = FadeOutTime * SampleRate / CONFIG_DEFAULT_SUBFRAGMENT_SIZE;
36          FadeOutCoeff = -1.0f / killSteps;          FadeOutCoeff = -1.0f / killSteps;
37      }      }
38    
39      void EGADSR::update(event_t Event, double SamplePos, float CurrentPitch, uint SampleRate) {      void EGADSR::update(event_t Event, uint SampleRate) {
40            if (Event == event_hold_end) HoldAttack = false;
41    
42          switch (Stage) {          switch (Stage) {
43              case stage_attack:              case stage_attack:
44                  if (StepsLeft) {                  switch (Event) {
45                      PostponedEvent = Event;                      case event_release:
                 } else {  
                     if (Event == event_release)  
                         enterReleasePart1Stage();  
                     else if (Event == event_cancel_release)  
                         enterSustainStage();  
                     else if (PostponedEvent == event_release)  
46                          enterReleasePart1Stage();                          enterReleasePart1Stage();
47                      else if (PostponedEvent == event_cancel_release)                          break;
48                        case event_cancel_release:
49                          enterSustainStage();                          enterSustainStage();
50                      else if (HoldAttack)                          break;
51                          enterAttackHoldStage(SamplePos, CurrentPitch);                      case event_stage_end:
52                      else                          if (HoldAttack)
53                          enterDecay1Part1Stage(SampleRate);                              enterAttackHoldStage();
54                            else
55                                enterDecay1Part1Stage(SampleRate);
56                            break;
57                  }                  }
58                  break;                  break;
59              case stage_attack_hold:              case stage_attack_hold:
60                  switch (Event) {                  switch (Event) {
61                      case event_stage_end:                      case event_stage_end: {// just refresh time
62                            const int intMax = (unsigned int) -1 >> 1;
63                            StepsLeft = intMax; // we use the highest possible value
64                            break;
65                        }
66                        case event_hold_end:
67                          enterDecay1Part1Stage(SampleRate);                          enterDecay1Part1Stage(SampleRate);
68                          break;                          break;
69                      case event_release:                      case event_release:
# Line 95  namespace LinuxSampler { namespace gig { Line 100  namespace LinuxSampler { namespace gig {
100                          break;                          break;
101                      case event_stage_end: // fall through                      case event_stage_end: // fall through
102                      case event_cancel_release:                      case event_cancel_release:
103                          if (InfiniteSustain)                          if (Level < CONFIG_EG_BOTTOM)
104                                enterEndStage();
105                            else if (InfiniteSustain)
106                              enterSustainStage();                              enterSustainStage();
107                          else                          else
108                              enterDecay2Stage(SampleRate);                              enterDecay2Stage(SampleRate);
# Line 110  namespace LinuxSampler { namespace gig { Line 117  namespace LinuxSampler { namespace gig {
117                      case event_release:                      case event_release:
118                          enterReleasePart1Stage();                          enterReleasePart1Stage();
119                          break;                          break;
120                        case event_hold_end:
121                            enterDecay1Part1Stage(SampleRate);
122                            break;
123                  }                  }
124                  break;                  break;
125              case stage_sustain:              case stage_sustain:
# Line 122  namespace LinuxSampler { namespace gig { Line 132  namespace LinuxSampler { namespace gig {
132                      case event_release:                      case event_release:
133                          enterReleasePart1Stage();                          enterReleasePart1Stage();
134                          break;                          break;
135                        case event_hold_end:
136                            enterDecay1Part1Stage(SampleRate);
137                            break;
138                  }                  }
139                  break;                  break;
140              case stage_release_part1:              case stage_release_part1:
# Line 160  namespace LinuxSampler { namespace gig { Line 173  namespace LinuxSampler { namespace gig {
173          }          }
174      }      }
175    
176      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) {
177            this->SustainLevel     = SustainLevel / 1000.0;
         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;  
180    
181          this->Decay1Time = Decay1Time;          this->Decay1Time = Decay1Time;
182          this->Decay2Time = Decay2Time;          this->Decay2Time = Decay2Time;
# Line 190  namespace LinuxSampler { namespace gig { Line 194  namespace LinuxSampler { namespace gig {
194          ReleaseCoeff3 = ExpOffset * (1 - ReleaseCoeff2);          ReleaseCoeff3 = ExpOffset * (1 - ReleaseCoeff2);
195          ReleaseLevel2 = 0.25 * invVolume;          ReleaseLevel2 = 0.25 * invVolume;
196    
197          enterAttackStage(PreAttack, AttackTime, SampleRate, 0.0, 1.0f);          enterAttackStage(PreAttack, AttackTime, SampleRate);
198      }      }
199    
200      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) {
201          Stage   = stage_attack;          Stage   = stage_attack;
202          Segment = segment_lin;          Segment = segment_lin;
203          // Measurements of GSt output shows that the real attack time  
204          // is about 65.5% of the value specified in the gig file.          if (AttackTime >= 0.0005f) {
205          StepsLeft = (int) (0.655f * AttackTime * SampleRate);              // Measurements of GSt output shows that the real attack time
206          if (StepsLeft) {              // is about 65.5% of the value specified in the gig file.
207                // The minimum attack value used is 0.032.
208                StepsLeft = int(0.655f * RTMath::Max(AttackTime, 0.032f) * SampleRate);
209              Level = (float) PreAttack / 1000.0;              Level = (float) PreAttack / 1000.0;
210              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
211          } else { // immediately jump to the next stage          } else { // attack is zero - immediately jump to the next stage
212              Level = 1.0;              Level = 1.029f; // a bit higher than max sustain
213              if (HoldAttack) enterAttackHoldStage(SamplePos, CurrentPitch);              if (HoldAttack) enterAttackHoldStage();
214              else            enterDecay1Part1Stage(SampleRate);              else            enterDecay1Part1Stage(SampleRate);
215          }          }
         PostponedEvent = (event_t) -1; // init with anything except release or cancel_release  
216      }      }
217    
218      void EGADSR::enterAttackHoldStage(const double SamplePos, const float CurrentPitch) {      void EGADSR::enterAttackHoldStage() {
219          Stage     = stage_attack_hold;          Stage     = stage_attack_hold;
220          Segment   = segment_lin;          Segment   = segment_lin;
221          Coeff     = 0.0f; // don't rise anymore          Coeff     = 0.0f; // don't rise anymore
222          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;
223            StepsLeft = intMax; // we use the highest value possible (we refresh StepsLeft in update() in case)
224      }      }
225    
226      void EGADSR::enterDecay1Part1Stage(const uint SampleRate) {      void EGADSR::enterDecay1Part1Stage(const uint SampleRate) {
# Line 228  namespace LinuxSampler { namespace gig { Line 234  namespace LinuxSampler { namespace gig {
234          // (where d is 1/SampleRate). The transition from f to g is          // (where d is 1/SampleRate). The transition from f to g is
235          // done when f(x) has reached Level2 = 25% of full volume.          // done when f(x) has reached Level2 = 25% of full volume.
236          StepsLeft = (int) (Decay1Time * SampleRate);          StepsLeft = (int) (Decay1Time * SampleRate);
237          if (StepsLeft && SustainLevel < 1.0) {          if (StepsLeft && Level > SustainLevel) {
238              Stage        = stage_decay1_part1;              Stage        = stage_decay1_part1;
239              Segment      = segment_lin;              Segment      = segment_lin;
240              Decay1Slope  = 1.365 * (SustainLevel - 1.0) / StepsLeft;              Decay1Slope = (1.347f * SustainLevel - 1.361f) / StepsLeft;
241              Coeff        = Decay1Slope * invVolume;              Coeff        = Decay1Slope * invVolume;
242              Decay1Level2 = 0.25 * invVolume;              Decay1Level2 = 0.25 * invVolume;
243              if (Level < Decay1Level2) enterDecay1Part2Stage(SampleRate);              if (Level < Decay1Level2) enterDecay1Part2Stage(SampleRate);
# Line 259  namespace LinuxSampler { namespace gig { Line 265  namespace LinuxSampler { namespace gig {
265      void EGADSR::enterDecay2Stage(const uint SampleRate) {      void EGADSR::enterDecay2Stage(const uint SampleRate) {
266          Stage      = stage_decay2;          Stage      = stage_decay2;
267          Segment    = segment_lin;          Segment    = segment_lin;
268          Decay2Time = RTMath::Max(Decay2Time, CONFIG_EG_MIN_RELEASE_TIME);          Decay2Time = RTMath::Max(Decay2Time, 0.05f);
269          StepsLeft  = (int) (Decay2Time * SampleRate);          StepsLeft  = (int) (Decay2Time * SampleRate);
270          Coeff      = (-1.03 / StepsLeft) * invVolume;          Coeff      = (-1.03 / StepsLeft) * invVolume;
271          //FIXME: do we really have to calculate 'StepsLeft' two times?          //FIXME: do we really have to calculate 'StepsLeft' two times?
# Line 280  namespace LinuxSampler { namespace gig { Line 286  namespace LinuxSampler { namespace gig {
286          Segment   = segment_lin;          Segment   = segment_lin;
287          StepsLeft = int((ReleaseLevel2 - Level) / ReleaseCoeff);          StepsLeft = int((ReleaseLevel2 - Level) / ReleaseCoeff);
288          Coeff     = ReleaseCoeff;          Coeff     = ReleaseCoeff;
289            if (StepsLeft == 0) enterReleasePart2Stage();
290      }      }
291    
292      void EGADSR::enterReleasePart2Stage() {      void EGADSR::enterReleasePart2Stage() {
# Line 288  namespace LinuxSampler { namespace gig { Line 295  namespace LinuxSampler { namespace gig {
295          StepsLeft = int(log((CONFIG_EG_BOTTOM - ExpOffset) / (Level - ExpOffset)) / ReleaseSlope);          StepsLeft = int(log((CONFIG_EG_BOTTOM - ExpOffset) / (Level - ExpOffset)) / ReleaseSlope);
296          Coeff     = ReleaseCoeff2;          Coeff     = ReleaseCoeff2;
297          Offset    = ReleaseCoeff3;          Offset    = ReleaseCoeff3;
298            if (StepsLeft == 0) enterFadeOutStage();
299      }      }
300    
301      void EGADSR::enterFadeOutStage() {      void EGADSR::enterFadeOutStage() {
# Line 301  namespace LinuxSampler { namespace gig { Line 309  namespace LinuxSampler { namespace gig {
309      void EGADSR::enterEndStage() {      void EGADSR::enterEndStage() {
310          Stage   = stage_end;          Stage   = stage_end;
311          Segment = segment_end;          Segment = segment_end;
312            Level   = 0;
313      }      }
314    
315  }} // namespace LinuxSampler::gig  }} // namespace LinuxSampler::gig
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