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* LinuxSampler - modular, streaming capable sampler * |
* LinuxSampler - modular, streaming capable sampler * |
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* * |
* * |
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* Copyright (C) 2003, 2004 by Benno Senoner and Christian Schoenebeck * |
* Copyright (C) 2003, 2004 by Benno Senoner and Christian Schoenebeck * |
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* Copyright (C) 2005 Christian Schoenebeck * |
* Copyright (C) 2005 - 2017 Christian Schoenebeck * |
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* * |
* * |
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* This program is free software; you can redistribute it and/or modify * |
* This program is free software; you can redistribute it and/or modify * |
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* 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 * |
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#include "EGADSR.h" |
#include "EGADSR.h" |
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#include "../../common/global_private.h" |
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namespace LinuxSampler { namespace gig { |
namespace LinuxSampler { namespace gig { |
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const float EGADSR::FadeOutCoeff(CalculateFadeOutCoeff()); |
EGADSR::EGADSR() : EG() { |
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AttackCancel = true; |
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AttackHoldCancel = true; |
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Decay1Cancel = true; |
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Decay2Cancel = true; |
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ReleaseCancel = true; |
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} |
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float EGADSR::CalculateFadeOutCoeff() { |
#define isTransitionEvent(type) \ |
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const float sampleRate = 44100.0; // even if the sample rate will be 192kHz it won't hurt at all |
( type == event_release || type == event_cancel_release ) |
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const float killSteps = CONFIG_EG_MIN_RELEASE_TIME * sampleRate; |
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return -1.0f / killSteps; |
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} |
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EGADSR::EGADSR(gig::Engine* pEngine, Event::destination_t ModulationDestination) { |
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this->pEngine = pEngine; |
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this->ModulationDestination = ModulationDestination; |
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Stage = stage_end; |
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Level = 0.0; |
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} |
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/** |
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* Will be called by the voice for every audio fragment to let the EG |
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* queue it's modulation changes for the current audio fragment. |
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* |
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* @param TotalSamples - total number of sample points to be rendered in this |
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* audio fragment cycle by the audio engine |
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* @param pEvents - event list with "release" and "cancel release" events |
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* @param itTriggerEvent - event that caused triggering of the voice (only if |
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* the voice was triggered in the current audio |
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* fragment, NULL otherwise) |
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* @param SamplePos - current playback position |
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* @param CurrentPitch - current pitch value for playback |
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* @param itKillEvent - (optional) event which caused this voice to be killed |
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*/ |
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void EGADSR::Process(uint TotalSamples, RTList<Event>* pEvents, RTList<Event>::Iterator itTriggerEvent, double SamplePos, double CurrentPitch, RTList<Event>::Iterator itKillEvent) { |
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// skip all events which occured before this voice was triggered |
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RTList<Event>::Iterator itTransitionEvent = (itTriggerEvent) ? ++itTriggerEvent : pEvents->first(); |
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// if the voice was killed in this fragment we only process the time before this kill event, then switch to 'stage_fadeout' |
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int Samples = (itKillEvent) ? RTMath::Min(itKillEvent->FragmentPos(), pEngine->MaxFadeOutPos) : (int) TotalSamples; |
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int iSample = TriggerDelay; |
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#if CONFIG_DEVMODE |
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if (TriggerDelay > TotalSamples) { // just a sanity check for debugging |
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dmsg(1,("EGADSR: ERROR, TriggerDelay > Totalsamples\n")); |
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int* i = NULL; |
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(*i)++; // force a segfault |
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} |
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#endif // CONFIG_DEVMODE |
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while (iSample < TotalSamples) { |
void EGADSR::update(event_t Event, uint SampleRate) { |
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if (atEnd(Event)) return; |
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// if the voice was killed in this fragment and we already processed the time before this kill event |
if (Event == event_hold_end) HoldAttack = false; |
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if (itKillEvent && iSample >= Samples) Stage = stage_fadeout; |
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switch (Stage) { |
switch (Stage) { |
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case stage_attack: { |
case stage_attack: |
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TriggerDelay = 0; |
switch (Event) { |
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int to_process = RTMath::Min(AttackStepsLeft, Samples - iSample); |
case event_release: |
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int process_end = iSample + to_process; |
if (AttackCancel) |
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AttackStepsLeft -= to_process; |
enterNextStageForReleaseEvent(SampleRate); |
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while (iSample < process_end) { |
else |
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Level += AttackCoeff; |
PostponedEvent = Event; |
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pEngine->pSynthesisParameters[ModulationDestination][iSample++] *= Level; |
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} |
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if (iSample == TotalSamples && itTransitionEvent) { // postpone last transition event for the next audio fragment |
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RTList<Event>::Iterator itLastEvent = pEvents->last(); |
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if (itLastEvent) ReleasePostponed = (itLastEvent->Type == Event::type_release); |
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} |
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if (!AttackStepsLeft) Stage = (ReleasePostponed) ? stage_release_init : (HoldAttack) ? stage_attack_hold : stage_decay1_init; |
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break; |
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} |
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case stage_attack_hold: { |
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if (SamplePos >= LoopStart) { |
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Stage = stage_decay1_init; |
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break; |
break; |
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} |
case event_stage_end: |
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int holdstepsleft = (int) (LoopStart - SamplePos / CurrentPitch); // FIXME: just an approximation, inaccuracy grows with higher audio fragment size, sufficient for usual fragment sizes though |
if (PostponedEvent == event_release) |
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int to_process = RTMath::Min(holdstepsleft, Samples - iSample); |
enterNextStageForReleaseEvent(SampleRate); |
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int process_end = iSample + to_process; |
else if (HoldAttack) |
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if (itTransitionEvent && itTransitionEvent->FragmentPos() <= process_end) { |
enterAttackHoldStage(); |
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process_end = itTransitionEvent->FragmentPos(); |
else |
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Stage = (itTransitionEvent->Type == Event::type_release) ? stage_release_init : (InfiniteSustain) ? stage_sustain : stage_decay2_init; |
enterDecay1Part1Stage(SampleRate); |
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++itTransitionEvent; |
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} |
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else if (to_process == holdstepsleft) Stage = stage_decay1_init; |
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while (iSample < process_end) { |
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pEngine->pSynthesisParameters[ModulationDestination][iSample++] *= Level; |
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} |
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break; |
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} |
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case stage_decay1_init: { |
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if (Decay1StepsLeft) { |
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if (SustainLevel < 1.0) { |
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Decay1StepsLeft = int((RTMath::Max(Decay1Level2, SustainLevel) - Level) / Decay1Coeff); |
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} else { |
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Stage = (InfiniteSustain) ? stage_sustain : stage_decay2_init; |
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break; |
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} |
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} else { |
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Level = SustainLevel; |
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Stage = (InfiniteSustain) ? stage_sustain : stage_decay2_init; |
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break; |
break; |
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} |
default: ; // noop |
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Stage = stage_decay1; |
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} |
} |
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case stage_decay1: { |
break; |
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int to_process = RTMath::Min(Samples - iSample, Decay1StepsLeft); |
case stage_attack_hold: |
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int process_end = iSample + to_process; |
switch (Event) { |
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if (itTransitionEvent && itTransitionEvent->FragmentPos() <= process_end) { |
case event_stage_end: {// just refresh time |
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process_end = itTransitionEvent->FragmentPos(); |
const int intMax = (unsigned int) -1 >> 1; |
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Stage = (itTransitionEvent->Type == Event::type_release) ? stage_release_init : (InfiniteSustain) ? stage_sustain : stage_decay2_init; |
StepsLeft = intMax; // we use the highest possible value |
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++itTransitionEvent; |
break; |
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} |
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else { |
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Decay1StepsLeft -= to_process; |
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if (!Decay1StepsLeft) Stage = stage_decay1_part2_init; |
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} |
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while (iSample < process_end) { |
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Level += Decay1Coeff; |
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pEngine->pSynthesisParameters[ModulationDestination][iSample++] *= Level; |
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} |
} |
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break; |
case event_hold_end: |
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if (PostponedEvent == event_release) |
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enterNextStageForReleaseEvent(SampleRate); |
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else |
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enterDecay1Part1Stage(SampleRate); |
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break; |
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case event_release: |
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if (AttackHoldCancel) |
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enterNextStageForReleaseEvent(SampleRate); |
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else |
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PostponedEvent = Event; |
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break; |
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default: ; // noop |
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} |
} |
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case stage_decay1_part2_init: |
break; |
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Decay1StepsLeft = int(log((SustainLevel - ExpOffset) / (Level - ExpOffset)) / Decay1Slope); |
case stage_decay1_part1: |
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Stage = stage_decay1_part2; |
switch (Event) { |
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case stage_decay1_part2: { |
case event_stage_end: |
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int to_process = RTMath::Min(Samples - iSample, Decay1StepsLeft); |
enterDecay1Part2Stage(SampleRate); |
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int process_end = iSample + to_process; |
break; |
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if (itTransitionEvent && itTransitionEvent->FragmentPos() <= process_end) { |
case event_release: |
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process_end = itTransitionEvent->FragmentPos(); |
if (Decay1Cancel) |
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Stage = (itTransitionEvent->Type == Event::type_release) ? stage_release_init : (InfiniteSustain) ? stage_sustain : stage_decay2_init; |
enterNextStageForReleaseEvent(SampleRate); |
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++itTransitionEvent; |
else |
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} |
PostponedEvent = Event; |
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else { |
break; |
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Decay1StepsLeft -= to_process; |
default: ; // noop |
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if (!Decay1StepsLeft) Stage = (InfiniteSustain) ? stage_sustain : stage_decay2_init; |
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} |
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while (iSample < process_end) { |
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Level = Level * Decay1Coeff2 + Decay1Coeff3; |
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pEngine->pSynthesisParameters[ModulationDestination][iSample++] *= Level; |
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} |
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break; |
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} |
} |
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case stage_decay2_init: |
break; |
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Decay2StepsLeft = int((CONFIG_EG_BOTTOM - Level) / Decay2Coeff); |
case stage_decay1_part2: |
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Stage = stage_decay2; |
switch (Event) { |
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case stage_decay2: { |
case event_release: |
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int to_process = RTMath::Min(Samples - iSample, Decay2StepsLeft); |
if (Decay1Cancel) |
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int process_end = iSample + to_process; |
enterNextStageForReleaseEvent(SampleRate); |
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if (itTransitionEvent && itTransitionEvent->Type == Event::type_release && itTransitionEvent->FragmentPos() <= process_end) { |
else |
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process_end = itTransitionEvent->FragmentPos(); |
PostponedEvent = Event; |
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++itTransitionEvent; |
break; |
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Stage = stage_release_init; // switch to release stage soon |
case event_stage_end: |
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} |
if (Level < CONFIG_EG_BOTTOM) |
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else { |
enterEndStage(); |
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Decay2StepsLeft -= to_process; |
else if (PostponedEvent == event_release) |
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if (!Decay2StepsLeft) Stage = stage_fadeout; |
enterNextStageForReleaseEvent(SampleRate); |
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} |
else if (InfiniteSustain) |
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while (iSample < process_end) { |
enterSustainStage(); |
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Level += Decay2Coeff; |
else |
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pEngine->pSynthesisParameters[ModulationDestination][iSample++] *= Level; |
enterDecay2Stage(SampleRate); |
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} |
break; |
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break; |
default: ; // noop |
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} |
} |
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case stage_sustain: { |
break; |
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int process_end; |
case stage_decay2: |
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if (itTransitionEvent && itTransitionEvent->Type == Event::type_release && itTransitionEvent->FragmentPos() <= Samples) { |
switch (Event) { |
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process_end = itTransitionEvent->FragmentPos(); |
case event_stage_end: |
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++itTransitionEvent; |
enterFadeOutStage(); |
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Stage = stage_release_init; // switch to release stage soon |
break; |
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} |
case event_release: |
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else process_end = Samples; |
if (Decay2Cancel) |
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while (iSample < process_end) { |
enterReleasePart1Stage(); |
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pEngine->pSynthesisParameters[ModulationDestination][iSample++] *= Level; |
else |
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} |
PostponedEvent = Event; |
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break; |
break; |
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case event_hold_end: |
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if (PostponedEvent == event_release && Decay1Cancel) |
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enterReleasePart1Stage(); |
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else |
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enterDecay1Part1Stage(SampleRate); |
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break; |
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default: ; // noop |
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} |
} |
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case stage_release_init: |
break; |
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ReleaseStepsLeft = int((ReleaseLevel2 - Level) / ReleaseCoeff); |
case stage_sustain: |
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Stage = stage_release; |
switch (Event) { |
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case stage_release: { |
case event_stage_end: {// just refresh time |
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int to_process = RTMath::Min(Samples - iSample, ReleaseStepsLeft); |
const int intMax = (unsigned int) -1 >> 1; |
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int process_end = iSample + to_process; |
StepsLeft = intMax; // we use the highest possible value |
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if (itTransitionEvent && itTransitionEvent->Type == Event::type_cancel_release && itTransitionEvent->FragmentPos() <= process_end) { |
break; |
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process_end = itTransitionEvent->FragmentPos(); |
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++itTransitionEvent; |
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Stage = (InfiniteSustain) ? stage_sustain : stage_decay2_init; // switch back to sustain / decay2 stage soon |
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} |
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else { |
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ReleaseStepsLeft -= to_process; |
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if (!ReleaseStepsLeft) Stage = stage_release_part2_init; |
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} |
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while (iSample < process_end) { |
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Level += ReleaseCoeff; |
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pEngine->pSynthesisParameters[ModulationDestination][iSample++] *= Level; |
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} |
} |
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break; |
case event_release: |
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enterReleasePart1Stage(); |
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break; |
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case event_hold_end: |
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enterDecay1Part1Stage(SampleRate); |
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break; |
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default: ; // noop |
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} |
} |
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case stage_release_part2_init: |
break; |
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ReleaseStepsLeft = int(log((CONFIG_EG_BOTTOM - ExpOffset) / (Level - ExpOffset)) / ReleaseSlope); |
case stage_release_part1: |
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Stage = stage_release_part2; |
switch (Event) { |
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case stage_release_part2: { |
case event_stage_end: |
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int to_process = RTMath::Min(Samples - iSample, ReleaseStepsLeft); |
enterReleasePart2Stage(); |
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int process_end = iSample + to_process; |
break; |
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if (itTransitionEvent && itTransitionEvent->Type == Event::type_cancel_release && itTransitionEvent->FragmentPos() <= process_end) { |
case event_cancel_release: |
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process_end = itTransitionEvent->FragmentPos(); |
if (!ReleaseCancel) |
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++itTransitionEvent; |
break; |
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Stage = (InfiniteSustain) ? stage_sustain : stage_decay2_init; // switch back to sustain / decay2 stage soon |
if (InfiniteSustain) |
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} |
enterSustainStage(); |
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else { |
else |
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ReleaseStepsLeft -= to_process; |
enterDecay2Stage(SampleRate); |
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if (!ReleaseStepsLeft) Stage = stage_fadeout; |
break; |
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} |
default: ; // noop |
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while (iSample < process_end) { |
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Level = Level * ReleaseCoeff2 + ReleaseCoeff3; |
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pEngine->pSynthesisParameters[ModulationDestination][iSample++] *= Level; |
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} |
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break; |
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} |
} |
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case stage_fadeout: { |
break; |
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int to_process = RTMath::Min(int(Level / (-FadeOutCoeff)), TotalSamples - iSample); |
case stage_release_part2: |
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int process_end = iSample + to_process; |
switch (Event) { |
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while (iSample < process_end) { |
case event_stage_end: |
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Level += FadeOutCoeff; |
enterFadeOutStage(); |
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pEngine->pSynthesisParameters[ModulationDestination][iSample++] *= Level; |
break; |
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} |
case event_cancel_release: |
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Stage = stage_end; |
if (!ReleaseCancel) |
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if (Level > -FadeOutCoeff) dmsg(1,("EGADSR: Warning, final fade out level too high, may result in click sound!\n")); |
break; |
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} //Fall through here instead of breaking otherwise we can get back into stage_fadeout and loop forever! |
if (InfiniteSustain) |
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case stage_end: { |
enterSustainStage(); |
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while (iSample < TotalSamples) { |
else |
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pEngine->pSynthesisParameters[ModulationDestination][iSample++] = 0.0f; |
enterDecay2Stage(SampleRate); |
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} |
break; |
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break; |
default: ; // noop |
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} |
} |
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} |
break; |
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} |
case stage_fadeout: |
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case stage_end: |
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#if CONFIG_DEVMODE |
; // noop |
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if (itKillEvent && Stage != stage_end) { // just a sanity check for debugging |
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dmsg(1,("EGADSR: ERROR, voice killing not completed !!!\n")); |
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dmsg(1,("EGADSR: Stage=%d,iSample=%d,Samples=%d, TotalSamples=%d, MaxFadoutPos=%d\n",Stage,iSample,Samples,TotalSamples,pEngine->MaxFadeOutPos)); |
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} |
} |
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#endif // CONFIG_DEVMODE |
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} |
} |
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/** |
void EGADSR::trigger(uint PreAttack, float AttackTime, bool HoldAttack, float Decay1Time, double Decay2Time, bool InfiniteSustain, uint SustainLevel, float ReleaseTime, float Volume, uint SampleRate) { |
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* Will be called by the voice when the key / voice was triggered. |
this->SustainLevel = SustainLevel / 1000.0; |
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* @param PreAttack - Preattack value for the envelope (0 - 1000 permille) |
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* @param AttackTime - Attack time for the envelope (0.000 - 60.000s) |
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* @param HoldAttack - If true, Decay1 will be postponed until the sample reached the sample loop start. |
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* @param LoopStart - Sample position where sample loop starts (if any) |
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* @param Decay1Time - Decay1 time of the sample amplitude EG (0.000 - 60.000s). |
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* @param Decay2Time - Only if !InfiniteSustain: 2nd decay stage time of the sample amplitude EG (0.000 - 60.000s). |
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* @param InfiniteSustain - If true, instead of going into Decay2 phase, Decay1 level will be hold until note will be released. |
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* @param SustainLevel - Sustain level of the sample amplitude EG (0 - 1000 permille). |
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* @param ReleaseTIme - Release time for the envelope (0.000 - 60.000s) |
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* @param Delay - Number of sample points triggering should be delayed. |
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* @param Volume - Volume the sample will be played at (0.0 - 1.0). Used when calculating the exponential curve parameters. |
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*/ |
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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) { |
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this->TriggerDelay = Delay; |
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this->Stage = stage_attack; |
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if (SustainLevel) { |
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this->SustainLevel = SustainLevel / 1000.0; |
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} else { |
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// sustain level 0 means that voice dies after decay 1 |
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this->SustainLevel = CONFIG_EG_BOTTOM; |
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InfiniteSustain = false; |
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Decay2Time = CONFIG_EG_MIN_RELEASE_TIME; |
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} |
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this->InfiniteSustain = InfiniteSustain; |
this->InfiniteSustain = InfiniteSustain; |
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this->HoldAttack = HoldAttack; |
this->HoldAttack = HoldAttack; |
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this->LoopStart = LoopStart; |
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this->ReleasePostponed = false; |
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// calculate attack stage parameters (lin. curve) |
this->Decay1Time = Decay1Time; |
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this->Decay2Time = Decay2Time; |
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invVolume = 1 / Volume; |
206 |
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ExpOffset = (0.25 - 1 / 3.55) * invVolume; |
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208 |
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// calculate release stage parameters (lin+exp curve) |
209 |
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if (ReleaseTime < CONFIG_EG_MIN_RELEASE_TIME) ReleaseTime = CONFIG_EG_MIN_RELEASE_TIME; // to avoid click sounds at the end of the sample playback |
210 |
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const float ReleaseStepsLeft = (long) (ReleaseTime * SampleRate); |
211 |
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ReleaseSlope = 1.365 * (0 - 1) / ReleaseStepsLeft; |
212 |
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ReleaseCoeff = ReleaseSlope * invVolume; |
213 |
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ReleaseSlope *= 3.55; |
214 |
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ReleaseCoeff2 = exp(ReleaseSlope); |
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ReleaseCoeff3 = ExpOffset * (1 - ReleaseCoeff2); |
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ReleaseLevel2 = 0.25 * invVolume; |
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PostponedEvent = (event_t) -1; // init with anything except release or cancel_release |
219 |
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220 |
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enterFirstStage(); |
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enterAttackStage(PreAttack, AttackTime, SampleRate); |
222 |
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} |
223 |
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224 |
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void EGADSR::setStateOptions(bool AttackCancel, bool AttackHoldCancel, bool Decay1Cancel, bool Decay2Cancel, bool ReleaseCancel) { |
225 |
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this->AttackCancel = AttackCancel; |
226 |
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this->AttackHoldCancel = AttackHoldCancel; |
227 |
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this->Decay1Cancel = Decay1Cancel; |
228 |
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this->Decay2Cancel = Decay2Cancel; |
229 |
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this->ReleaseCancel = ReleaseCancel; |
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} |
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232 |
// Measurements of GSt output shows that the real attack time |
void EGADSR::enterNextStageForReleaseEvent(uint SampleRate) { |
233 |
// is about 65.5% of the value specified in the gig file. |
switch (Stage) { |
234 |
AttackStepsLeft = (long) (0.655 * AttackTime * pEngine->pAudioOutputDevice->SampleRate()); |
case stage_attack: |
235 |
if (AttackStepsLeft) { |
if (HoldAttack && !AttackHoldCancel) { |
236 |
Level = (float) PreAttack / 1000.0; |
enterAttackHoldStage(); |
237 |
AttackCoeff = 0.896 * (1.0 - Level) / AttackStepsLeft; // max level is a bit lower if attack != 0 |
return; |
238 |
|
} |
239 |
|
case stage_attack_hold: |
240 |
|
if (!Decay1Cancel) { |
241 |
|
enterDecay1Part1Stage(SampleRate); |
242 |
|
return; |
243 |
|
} |
244 |
|
case stage_decay1_part1: |
245 |
|
case stage_decay1_part2: |
246 |
|
if (InfiniteSustain) { |
247 |
|
enterReleasePart1Stage(); |
248 |
|
return; |
249 |
|
} else if (!Decay2Cancel) { |
250 |
|
enterDecay2Stage(SampleRate); |
251 |
|
return; |
252 |
|
} |
253 |
|
default: |
254 |
|
enterReleasePart1Stage(); |
255 |
} |
} |
256 |
else { |
} |
257 |
Level = 1.0; |
|
258 |
AttackCoeff = 0.0; |
void EGADSR::enterAttackStage(const uint PreAttack, const float AttackTime, const uint SampleRate) { |
259 |
|
Stage = stage_attack; |
260 |
|
Segment = segment_lin; |
261 |
|
|
262 |
|
if (AttackTime >= 1e-8) { |
263 |
|
// Measurements of GSt output shows that the real attack time |
264 |
|
// is about 65.5% of the value specified in the gig file. |
265 |
|
// The minimum attack value used is 0.0316. |
266 |
|
StepsLeft = int(0.655f * RTMath::Max(AttackTime, 0.0316f) * SampleRate); |
267 |
|
Level = (float) PreAttack / 1000.0; |
268 |
|
Coeff = 0.896f * (1.0f - Level) / StepsLeft; // max level is a bit lower if attack != 0 |
269 |
|
} else { // attack is zero - immediately jump to the next stage |
270 |
|
Level = 1.029f; // a bit higher than max sustain |
271 |
|
if (HoldAttack) enterAttackHoldStage(); |
272 |
|
else enterDecay1Part1Stage(SampleRate); |
273 |
} |
} |
274 |
|
} |
275 |
|
|
276 |
const float invVolume = 1 / Volume; |
void EGADSR::enterAttackHoldStage() { |
277 |
ExpOffset = (0.25 - 1 / 3.55) * invVolume; |
Stage = stage_attack_hold; |
278 |
|
Segment = segment_lin; |
279 |
|
Coeff = 0.0f; // don't rise anymore |
280 |
|
const int intMax = (unsigned int) -1 >> 1; |
281 |
|
StepsLeft = intMax; // we use the highest value possible (we refresh StepsLeft in update() in case) |
282 |
|
} |
283 |
|
|
284 |
|
void EGADSR::enterDecay1Part1Stage(const uint SampleRate) { |
285 |
// The decay1 and release stage both consist of two parts, |
// The decay1 and release stage both consist of two parts, |
286 |
// first a linear curve, f, followed by an exponential curve, |
// first a linear curve, f, followed by an exponential curve, |
287 |
// g: |
// g: |
291 |
// |
// |
292 |
// (where d is 1/SampleRate). The transition from f to g is |
// (where d is 1/SampleRate). The transition from f to g is |
293 |
// done when f(x) has reached Level2 = 25% of full volume. |
// done when f(x) has reached Level2 = 25% of full volume. |
294 |
|
StepsLeft = (int) (Decay1Time * SampleRate); |
295 |
// calculate decay1 stage parameters (lin+exp curve) |
if (StepsLeft && Level > SustainLevel) { |
296 |
Decay1StepsLeft = (long) (Decay1Time * pEngine->pAudioOutputDevice->SampleRate()); |
Stage = stage_decay1_part1; |
297 |
if (Decay1StepsLeft) { |
Segment = segment_lin; |
298 |
Decay1Slope = 1.365 * (this->SustainLevel - 1.0) / Decay1StepsLeft; |
Decay1Slope = (1.347f * SustainLevel - 1.361f) / StepsLeft; |
299 |
Decay1Coeff = Decay1Slope * invVolume; |
Coeff = Decay1Slope * invVolume; |
|
Decay1Slope *= 3.55; |
|
|
Decay1Coeff2 = exp(Decay1Slope); |
|
|
Decay1Coeff3 = ExpOffset * (1 - Decay1Coeff2); |
|
300 |
Decay1Level2 = 0.25 * invVolume; |
Decay1Level2 = 0.25 * invVolume; |
301 |
|
StepsLeft = int((RTMath::Max(Decay1Level2, SustainLevel) - Level) / Coeff); |
302 |
|
if (StepsLeft <= 0) enterDecay1Part2Stage(SampleRate); |
303 |
|
} else { |
304 |
|
if (PostponedEvent == event_release) { |
305 |
|
Stage = stage_decay1_part2; // pretend decay 1 part 2 was completed |
306 |
|
enterNextStageForReleaseEvent(SampleRate); |
307 |
|
} else if (InfiniteSustain) { |
308 |
|
enterSustainStage(); |
309 |
|
} else { |
310 |
|
enterDecay2Stage(SampleRate); |
311 |
|
} |
312 |
} |
} |
313 |
|
} |
314 |
|
|
315 |
// calculate decay2 stage parameters (lin. curve) |
void EGADSR::enterDecay1Part2Stage(const uint SampleRate) { |
316 |
if (!InfiniteSustain) { |
if (SustainLevel < Decay1Level2) { |
317 |
if (Decay2Time < CONFIG_EG_MIN_RELEASE_TIME) Decay2Time = CONFIG_EG_MIN_RELEASE_TIME; |
Stage = stage_decay1_part2; |
318 |
long Decay2Steps = (long) (Decay2Time * pEngine->pAudioOutputDevice->SampleRate()); |
Segment = segment_exp; |
319 |
Decay2Coeff = (-1.03 / Decay2Steps) * invVolume; |
Decay1Slope *= 3.55; |
320 |
|
Coeff = exp(Decay1Slope); |
321 |
|
Offset = ExpOffset * (1 - Coeff); |
322 |
|
StepsLeft = int(log((SustainLevel - ExpOffset) / (Level - ExpOffset)) / Decay1Slope); |
323 |
|
if (StepsLeft > 0) return; |
324 |
} |
} |
325 |
|
if (PostponedEvent == event_release) { |
326 |
|
Stage = stage_decay1_part2; |
327 |
|
enterNextStageForReleaseEvent(SampleRate); |
328 |
|
} else if (InfiniteSustain) { |
329 |
|
enterSustainStage(); |
330 |
|
} else { |
331 |
|
enterDecay2Stage(SampleRate); |
332 |
|
} |
333 |
|
} |
334 |
|
|
335 |
// calculate release stage parameters (lin+exp curve) |
void EGADSR::enterDecay2Stage(const uint SampleRate) { |
336 |
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; |
337 |
ReleaseStepsLeft = (long) (ReleaseTime * pEngine->pAudioOutputDevice->SampleRate()); |
Segment = segment_lin; |
338 |
ReleaseSlope = 1.365 * (0 - 1) / ReleaseStepsLeft; |
Decay2Time = RTMath::Max(Decay2Time, 0.05f); |
339 |
ReleaseCoeff = ReleaseSlope * invVolume; |
StepsLeft = (int) (Decay2Time * SampleRate); |
340 |
ReleaseSlope *= 3.55; |
Coeff = (-1.03 / StepsLeft) * invVolume; |
341 |
ReleaseCoeff2 = exp(ReleaseSlope); |
//FIXME: do we really have to calculate 'StepsLeft' two times? |
342 |
ReleaseCoeff3 = ExpOffset * (1 - ReleaseCoeff2); |
StepsLeft = int((CONFIG_EG_BOTTOM - Level) / Coeff); |
343 |
ReleaseLevel2 = 0.25 * invVolume; |
if (StepsLeft <= 0) enterEndStage(); |
344 |
|
} |
345 |
|
|
346 |
|
void EGADSR::enterSustainStage() { |
347 |
|
Stage = stage_sustain; |
348 |
|
Segment = segment_lin; |
349 |
|
Coeff = 0.0f; // don't change the envelope level in this stage |
350 |
|
const int intMax = (unsigned int) -1 >> 1; |
351 |
|
StepsLeft = intMax; // we use the highest value possible (we refresh StepsLeft in update() in case) |
352 |
|
PostponedEvent = (event_t) -1; // reset with anything except release or cancel_release |
353 |
|
} |
354 |
|
|
355 |
|
void EGADSR::enterReleasePart1Stage() { |
356 |
|
Stage = stage_release_part1; |
357 |
|
Segment = segment_lin; |
358 |
|
StepsLeft = int((ReleaseLevel2 - Level) / ReleaseCoeff); |
359 |
|
Coeff = ReleaseCoeff; |
360 |
|
PostponedEvent = (event_t) -1; // reset with anything except release or cancel_release |
361 |
|
if (StepsLeft <= 0) enterReleasePart2Stage(); |
362 |
|
} |
363 |
|
|
364 |
dmsg(4,("PreAttack=%d, AttackLength=%d, AttackCoeff=%f, Decay1Coeff=%f, Decay2Coeff=%f, ReleaseLength=%d, ReleaseCoeff=%f\n", |
void EGADSR::enterReleasePart2Stage() { |
365 |
PreAttack, AttackStepsLeft, AttackCoeff, Decay1Coeff, Decay2Coeff, ReleaseStepsLeft, ReleaseCoeff)); |
Stage = stage_release_part2; |
366 |
|
Segment = segment_exp; |
367 |
|
StepsLeft = int(log((CONFIG_EG_BOTTOM - ExpOffset) / (Level - ExpOffset)) / ReleaseSlope); |
368 |
|
Coeff = ReleaseCoeff2; |
369 |
|
Offset = ReleaseCoeff3; |
370 |
|
if (StepsLeft <= 0) enterFadeOutStage(); |
371 |
} |
} |
372 |
|
|
373 |
}} // namespace LinuxSampler::gig |
}} // namespace LinuxSampler::gig |