/[svn]/linuxsampler/trunk/src/engines/gig/EGADSR.cpp
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revision 259 by senkov, Wed Sep 29 03:16:01 2004 UTC revision 271 by schoenebeck, Fri Oct 8 20:51:39 2004 UTC
# Line 46  namespace LinuxSampler { namespace gig { Line 46  namespace LinuxSampler { namespace gig {
46       * @param TotalSamples  - total number of sample points to be rendered in this       * @param TotalSamples  - total number of sample points to be rendered in this
47       *                        audio fragment cycle by the audio engine       *                        audio fragment cycle by the audio engine
48       * @param pEvents       - event list with "release" and "cancel release" events       * @param pEvents       - event list with "release" and "cancel release" events
49       * @param pTriggerEvent - event that caused triggering of the voice (only if       * @param itTriggerEvent - event that caused triggering of the voice (only if
50       *                        the voice was triggered in the current audio       *                        the voice was triggered in the current audio
51       *                        fragment, NULL otherwise)       *                        fragment, NULL otherwise)
52       * @param SamplePos     - current playback position       * @param SamplePos     - current playback position
53       * @param CurrentPitch  - current pitch value for playback       * @param CurrentPitch  - current pitch value for playback
54       * @param pKillEvent    - (optional) event which caused this voice to be killed       * @param itKillEvent   - (optional) event which caused this voice to be killed
55       */       */
56      void EGADSR::Process(uint TotalSamples, RTEList<Event>* pEvents, Event* pTriggerEvent, double SamplePos, double CurrentPitch, Event* pKillEvent) {      void EGADSR::Process(uint TotalSamples, RTList<Event>* pEvents, RTList<Event>::Iterator itTriggerEvent, double SamplePos, double CurrentPitch, RTList<Event>::Iterator itKillEvent) {
57          Event* pTransitionEvent;          // skip all events which occured before this voice was triggered
58          if (pTriggerEvent) { // skip all events which occured before this voice was triggered          RTList<Event>::Iterator itTransitionEvent = (itTriggerEvent) ? ++itTriggerEvent : pEvents->first();
             pEvents->set_current(pTriggerEvent);  
             pTransitionEvent = pEvents->next();  
         }  
         else {  
             pTransitionEvent = pEvents->first();  
         }  
59    
60          // if the voice was killed in this fragment we only process the time before this kill event, then switch to 'stage_fadeout'          // if the voice was killed in this fragment we only process the time before this kill event, then switch to 'stage_fadeout'
61          int Samples = (pKillEvent) ? pKillEvent->FragmentPos() : (int) TotalSamples;          int Samples = (itKillEvent) ? itKillEvent->FragmentPos() : (int) TotalSamples;
62    
63          int iSample = TriggerDelay;          int iSample = TriggerDelay;
64          while (iSample < TotalSamples) {          while (iSample < TotalSamples) {
65    
66              // if the voice was killed in this fragment and we already processed the time before this kill event              // if the voice was killed in this fragment and we already processed the time before this kill event
67              if (pKillEvent && iSample >= Samples) Stage = stage_fadeout;              if (itKillEvent && iSample >= Samples) Stage = stage_fadeout;
68    
69              switch (Stage) {              switch (Stage) {
70                  case stage_attack: {                  case stage_attack: {
# Line 83  namespace LinuxSampler { namespace gig { Line 77  namespace LinuxSampler { namespace gig {
77                          pEngine->pSynthesisParameters[ModulationDestination][iSample++] *= Level;                          pEngine->pSynthesisParameters[ModulationDestination][iSample++] *= Level;
78                      }                      }
79                      if (iSample == TotalSamples) { // postpone last transition event for the next audio fragment                      if (iSample == TotalSamples) { // postpone last transition event for the next audio fragment
80                          Event* pLastEvent = pEvents->last();                          RTList<Event>::Iterator itLastEvent = pEvents->last();
81                          if (pLastEvent) ReleasePostponed = (pLastEvent->Type == Event::type_release);                          if (itLastEvent) ReleasePostponed = (itLastEvent->Type == Event::type_release);
82                      }                      }
83                      if (!AttackStepsLeft) Stage = (ReleasePostponed) ? stage_release : (HoldAttack) ? stage_attack_hold : stage_decay1;                      if (!AttackStepsLeft) Stage = (ReleasePostponed) ? stage_release : (HoldAttack) ? stage_attack_hold : stage_decay1;
84                      break;                      break;
# Line 97  namespace LinuxSampler { namespace gig { Line 91  namespace LinuxSampler { namespace gig {
91                      int holdstepsleft = (int) (LoopStart - SamplePos / CurrentPitch); // FIXME: just an approximation, inaccuracy grows with higher audio fragment size, sufficient for usual fragment sizes though                      int holdstepsleft = (int) (LoopStart - SamplePos / CurrentPitch); // FIXME: just an approximation, inaccuracy grows with higher audio fragment size, sufficient for usual fragment sizes though
92                      int to_process    = RTMath::Min(holdstepsleft, Samples - iSample);                      int to_process    = RTMath::Min(holdstepsleft, Samples - iSample);
93                      int process_end   = iSample + to_process;                      int process_end   = iSample + to_process;
94                      if (pTransitionEvent && pTransitionEvent->FragmentPos() <= process_end) {                      if (itTransitionEvent && itTransitionEvent->FragmentPos() <= process_end) {
95                          process_end      = pTransitionEvent->FragmentPos();                          process_end       = itTransitionEvent->FragmentPos();
96                          Stage            = (pTransitionEvent->Type == Event::type_release) ? stage_release : (InfiniteSustain) ? stage_sustain : stage_decay2;                          Stage             = (itTransitionEvent->Type == Event::type_release) ? stage_release : (InfiniteSustain) ? stage_sustain : stage_decay2;
97                          pTransitionEvent = pEvents->next();                          ++itTransitionEvent;
98                      }                      }
99                      else if (to_process == holdstepsleft) Stage = stage_decay1;                      else if (to_process == holdstepsleft) Stage = stage_decay1;
100                      while (iSample < process_end) {                      while (iSample < process_end) {
# Line 111  namespace LinuxSampler { namespace gig { Line 105  namespace LinuxSampler { namespace gig {
105                  case stage_decay1: {                  case stage_decay1: {
106                      int to_process   = RTMath::Min(Samples - iSample, Decay1StepsLeft);                      int to_process   = RTMath::Min(Samples - iSample, Decay1StepsLeft);
107                      int process_end  = iSample + to_process;                      int process_end  = iSample + to_process;
108                      if (pTransitionEvent && pTransitionEvent->FragmentPos() <= process_end) {                      if (itTransitionEvent && itTransitionEvent->FragmentPos() <= process_end) {
109                          process_end      = pTransitionEvent->FragmentPos();                          process_end       = itTransitionEvent->FragmentPos();
110                          Stage            = (pTransitionEvent->Type == Event::type_release) ? stage_release : (InfiniteSustain) ? stage_sustain : stage_decay2;                          Stage             = (itTransitionEvent->Type == Event::type_release) ? stage_release : (InfiniteSustain) ? stage_sustain : stage_decay2;
111                          pTransitionEvent = pEvents->next();                          ++itTransitionEvent;
112                      }                      }
113                      else {                      else {
114                          Decay1StepsLeft -= to_process;                          Decay1StepsLeft -= to_process;
# Line 128  namespace LinuxSampler { namespace gig { Line 122  namespace LinuxSampler { namespace gig {
122                  }                  }
123                  case stage_decay2: {                  case stage_decay2: {
124                      int process_end;                      int process_end;
125                      if (pTransitionEvent && pTransitionEvent->Type == Event::type_release && pTransitionEvent->FragmentPos() <= Samples) {                      if (itTransitionEvent && itTransitionEvent->Type == Event::type_release && itTransitionEvent->FragmentPos() <= Samples) {
126                          process_end      = pTransitionEvent->FragmentPos();                          process_end       = itTransitionEvent->FragmentPos();
127                          pTransitionEvent = pEvents->next();                          ++itTransitionEvent;
128                          Stage            = stage_release; // switch to release stage soon                          Stage             = stage_release; // switch to release stage soon
129                      }                      }
130                      else process_end = Samples;                      else process_end = Samples;
131                      while (iSample < process_end) {                      while (iSample < process_end) {
# Line 143  namespace LinuxSampler { namespace gig { Line 137  namespace LinuxSampler { namespace gig {
137                  }                  }
138                  case stage_sustain: {                  case stage_sustain: {
139                      int process_end;                      int process_end;
140                      if (pTransitionEvent && pTransitionEvent->Type == Event::type_release && pTransitionEvent->FragmentPos() <= Samples) {                      if (itTransitionEvent && itTransitionEvent->Type == Event::type_release && itTransitionEvent->FragmentPos() <= Samples) {
141                          process_end      = pTransitionEvent->FragmentPos();                          process_end       = itTransitionEvent->FragmentPos();
142                          pTransitionEvent = pEvents->next();                          ++itTransitionEvent;
143                          Stage            = stage_release; // switch to release stage soon                          Stage             = stage_release; // switch to release stage soon
144                      }                      }
145                      else process_end = Samples;                      else process_end = Samples;
146                      while (iSample < process_end) {                      while (iSample < process_end) {
# Line 156  namespace LinuxSampler { namespace gig { Line 150  namespace LinuxSampler { namespace gig {
150                  }                  }
151                  case stage_release: {                  case stage_release: {
152                      int process_end;                      int process_end;
153                      if (pTransitionEvent && pTransitionEvent->Type == Event::type_cancel_release && pTransitionEvent->FragmentPos() <= Samples) {                      if (itTransitionEvent && itTransitionEvent->Type == Event::type_cancel_release && itTransitionEvent->FragmentPos() <= Samples) {
154                          process_end      = pTransitionEvent->FragmentPos();                          process_end       = itTransitionEvent->FragmentPos();
155                          pTransitionEvent = pEvents->next();                          ++itTransitionEvent;
156                          Stage            = (InfiniteSustain) ? stage_sustain : stage_decay2; // switch back to sustain / decay2 stage soon                          Stage             = (InfiniteSustain) ? stage_sustain : stage_decay2; // switch back to sustain / decay2 stage soon
157                      }                      }
158                      else process_end = Samples;                      else process_end = Samples;
159                      while (iSample < process_end) {                      while (iSample < process_end) {

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