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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 * |
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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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namespace LinuxSampler { namespace gig { |
namespace LinuxSampler { namespace gig { |
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const float EGADSR::FadeOutCoeff(CalculateFadeOutCoeff()); |
EGADSR::EGADSR() { |
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enterEndStage(); |
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float EGADSR::CalculateFadeOutCoeff() { |
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const float sampleRate = 44100.0; // even if the sample rate will be 192kHz it won't hurt at all |
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const float killSteps = 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; |
Level = 0.0; |
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CalculateFadeOutCoeff(CONFIG_EG_MIN_RELEASE_TIME, 44100.0); // even if the sample rate will be 192kHz it won't hurt at all |
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} |
} |
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/** |
void EGADSR::CalculateFadeOutCoeff(float FadeOutTime, float SampleRate) { |
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* Will be called by the voice for every audio fragment to let the EG |
const float killSteps = FadeOutTime * SampleRate; |
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* queue it's modulation changes for the current audio fragment. |
FadeOutCoeff = -1.0f / killSteps; |
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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 DEVMODE |
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if (TriggerDelay > TotalSamples) { // FIXME: should be removed before the final release (purpose: 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 // DEVMODE |
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while (iSample < TotalSamples) { |
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// if the voice was killed in this fragment and we already processed the time before this kill event |
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if (itKillEvent && iSample >= Samples) Stage = stage_fadeout; |
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switch (Stage) { |
void EGADSR::update(event_t Event, double SamplePos, float CurrentPitch, uint SampleRate) { |
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case stage_attack: { |
switch (Stage) { |
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TriggerDelay = 0; |
case stage_attack: |
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int to_process = RTMath::Min(AttackStepsLeft, Samples - iSample); |
if (StepsLeft) { |
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int process_end = iSample + to_process; |
PostponedEvent = Event; |
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AttackStepsLeft -= to_process; |
} else { |
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while (iSample < process_end) { |
if (Event == event_release) |
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Level += AttackCoeff; |
enterReleasePart1Stage(); |
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pEngine->pSynthesisParameters[ModulationDestination][iSample++] *= Level; |
else if (Event == event_cancel_release) |
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} |
enterSustainStage(); |
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if (iSample == TotalSamples && itTransitionEvent) { // postpone last transition event for the next audio fragment |
else if (PostponedEvent == event_release) |
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RTList<Event>::Iterator itLastEvent = pEvents->last(); |
enterReleasePart1Stage(); |
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if (itLastEvent) ReleasePostponed = (itLastEvent->Type == Event::type_release); |
else if (PostponedEvent == event_cancel_release) |
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} |
enterSustainStage(); |
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if (!AttackStepsLeft) Stage = (ReleasePostponed) ? stage_release : (HoldAttack) ? stage_attack_hold : stage_decay1; |
else if (HoldAttack) |
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break; |
enterAttackHoldStage(SamplePos, CurrentPitch); |
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else |
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enterDecay1Part1Stage(SampleRate); |
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} |
} |
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case stage_attack_hold: { |
break; |
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if (SamplePos >= LoopStart) { |
case stage_attack_hold: |
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Stage = stage_decay1; |
switch (Event) { |
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case event_stage_end: |
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enterDecay1Part1Stage(SampleRate); |
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break; |
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case event_release: |
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enterReleasePart1Stage(); |
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break; |
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case event_cancel_release: |
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if (InfiniteSustain) |
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enterSustainStage(); |
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else |
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enterDecay1Part1Stage(SampleRate); |
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break; |
break; |
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} |
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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 |
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int to_process = RTMath::Min(holdstepsleft, Samples - iSample); |
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int process_end = iSample + to_process; |
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if (itTransitionEvent && itTransitionEvent->FragmentPos() <= process_end) { |
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process_end = itTransitionEvent->FragmentPos(); |
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Stage = (itTransitionEvent->Type == Event::type_release) ? stage_release : (InfiniteSustain) ? stage_sustain : stage_decay2; |
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++itTransitionEvent; |
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} |
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else if (to_process == holdstepsleft) Stage = stage_decay1; |
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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: { |
break; |
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int to_process = RTMath::Min(Samples - iSample, Decay1StepsLeft); |
case stage_decay1_part1: |
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int process_end = iSample + to_process; |
switch (Event) { |
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if (itTransitionEvent && itTransitionEvent->FragmentPos() <= process_end) { |
case stage_end: |
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process_end = itTransitionEvent->FragmentPos(); |
enterDecay1Part2Stage(); |
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Stage = (itTransitionEvent->Type == Event::type_release) ? stage_release : (InfiniteSustain) ? stage_sustain : stage_decay2; |
break; |
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++itTransitionEvent; |
case event_release: |
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} |
enterReleasePart1Stage(); |
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else { |
break; |
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Decay1StepsLeft -= to_process; |
case event_cancel_release: |
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if (!Decay1StepsLeft) Stage = (InfiniteSustain) ? stage_sustain : stage_decay2; |
if (InfiniteSustain) |
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} |
enterSustainStage(); |
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while (iSample < process_end) { |
else |
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Level += Level * Decay1Coeff; |
enterDecay2Stage(SampleRate); |
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pEngine->pSynthesisParameters[ModulationDestination][iSample++] *= Level; |
break; |
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} |
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break; |
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} |
} |
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case stage_decay2: { |
break; |
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int process_end; |
case stage_decay1_part2: |
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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_release: |
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++itTransitionEvent; |
enterReleasePart1Stage(); |
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Stage = stage_release; // switch to release stage soon |
break; |
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} |
case event_stage_end: // fall through |
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else process_end = Samples; |
case event_cancel_release: |
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while (iSample < process_end) { |
if (InfiniteSustain) |
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Level += Level * Decay2Coeff; |
enterSustainStage(); |
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pEngine->pSynthesisParameters[ModulationDestination][iSample++] *= Level; |
else |
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} |
enterDecay2Stage(SampleRate); |
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if (Level <= EG_ENVELOPE_LIMIT) Stage = stage_fadeout; |
break; |
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break; |
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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; // switch to release stage soon |
break; |
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} |
case event_release: |
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else process_end = Samples; |
enterReleasePart1Stage(); |
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while (iSample < process_end) { |
break; |
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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_release: { |
break; |
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int process_end; |
case stage_sustain: |
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if (itTransitionEvent && itTransitionEvent->Type == Event::type_cancel_release && itTransitionEvent->FragmentPos() <= Samples) { |
switch (Event) { |
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process_end = itTransitionEvent->FragmentPos(); |
case event_stage_end: {// just refresh time |
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++itTransitionEvent; |
const int intMax = (unsigned int) -1 >> 1; |
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Stage = (InfiniteSustain) ? stage_sustain : stage_decay2; // switch back to sustain / decay2 stage soon |
StepsLeft = intMax; // we use the highest possible value |
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} |
break; |
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else process_end = Samples; |
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while (iSample < process_end) { |
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Level += Level * ReleaseCoeff; |
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pEngine->pSynthesisParameters[ModulationDestination][iSample++] *= Level; |
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} |
} |
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if (Level <= EG_ENVELOPE_LIMIT) Stage = stage_fadeout; |
case event_release: |
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break; |
enterReleasePart1Stage(); |
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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_part1: |
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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; |
enterReleasePart2Stage(); |
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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 (InfiniteSustain) |
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if (Level > -FadeOutCoeff) dmsg(1,("EGADSR: Warning, final fade out level too high, may result in click sound!\n")); |
enterSustainStage(); |
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} //Fall through here instead of breaking otherwise we can get back into stage_fadeout and loop forever! |
else |
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case stage_end: { |
enterDecay2Stage(SampleRate); |
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while (iSample < TotalSamples) { |
break; |
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pEngine->pSynthesisParameters[ModulationDestination][iSample++] = 0.0f; |
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} |
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break; |
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} |
} |
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} |
break; |
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} |
case stage_release_part2: |
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switch (Event) { |
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#if DEVMODE |
case event_stage_end: |
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if (itKillEvent && Stage != stage_end) { // FIXME: should be removed before the final release (purpose: just a sanity check for debugging) |
enterFadeOutStage(); |
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dmsg(1,("EGADSR: ERROR, voice killing not completed !!!\n")); |
break; |
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dmsg(1,("EGADSR: Stage=%d,iSample=%d,Samples=%d, TotalSamples=%d, MaxFadoutPos=%d\n",Stage,iSample,Samples,TotalSamples,pEngine->MaxFadeOutPos)); |
case event_cancel_release: |
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if (InfiniteSustain) |
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enterSustainStage(); |
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else |
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enterDecay2Stage(SampleRate); |
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break; |
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} |
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break; |
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case stage_fadeout: |
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switch (Event) { |
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case event_stage_end: |
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enterEndStage(); |
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break; |
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} |
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break; |
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} |
} |
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#endif // DEVMODE |
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} |
} |
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/** |
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) { |
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* Will be called by the voice when the key / voice was triggered. |
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* |
enterAttackStage(PreAttack, AttackTime, SampleRate, 0.0, 1.0f); |
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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) |
if (SustainLevel) { |
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* @param HoldAttack - If true, Decay1 will be postponed until the sample reached the sample loop start. |
this->SustainLevel = SustainLevel / 1000.0; |
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* @param LoopStart - Sample position where sample loop starts (if any) |
} else { |
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* @param Decay1Time - Decay1 time of the sample amplitude EG (0.000 - 60.000s). |
// sustain level 0 means that voice dies after decay 1 |
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* @param Decay2Time - Only if !InfiniteSustain: 2nd decay stage time of the sample amplitude EG (0.000 - 60.000s). |
this->SustainLevel = CONFIG_EG_BOTTOM; |
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* @param InfiniteSustain - If true, instead of going into Decay2 phase, Decay1 level will be hold until note will be released. |
InfiniteSustain = false; |
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* @param SustainLevel - Sustain level of the sample amplitude EG (0 - 1000 permille). |
Decay2Time = CONFIG_EG_MIN_RELEASE_TIME; |
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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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*/ |
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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) { |
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this->TriggerDelay = Delay; |
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this->Stage = stage_attack; |
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this->SustainLevel = (SustainLevel) ? (SustainLevel > EG_ENVELOPE_LIMIT) ? (float) SustainLevel / 1000.0 : EG_ENVELOPE_LIMIT : 1.0; |
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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; |
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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AttackStepsLeft = (long) (AttackTime * pEngine->pAudioOutputDevice->SampleRate()); |
this->Decay2Time = Decay2Time; |
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if (AttackStepsLeft) { |
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Level = (float) PreAttack / 1000.0; |
invVolume = 1 / Volume; |
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AttackCoeff = (1.0 - Level) / AttackStepsLeft; |
ExpOffset = (0.25 - 1 / 3.55) * invVolume; |
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} |
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else { |
// calculate release stage parameters (lin+exp curve) |
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Level = 1.0; |
if (ReleaseTime < CONFIG_EG_MIN_RELEASE_TIME) ReleaseTime = CONFIG_EG_MIN_RELEASE_TIME; // to avoid click sounds at the end of the sample playback |
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AttackCoeff = 0.0; |
const float ReleaseStepsLeft = (long) (ReleaseTime * SampleRate); |
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ReleaseSlope = 1.365 * (0 - 1) / ReleaseStepsLeft; |
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ReleaseCoeff = ReleaseSlope * invVolume; |
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ReleaseSlope *= 3.55; |
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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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} |
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void EGADSR::enterAttackStage(const uint PreAttack, const float AttackTime, const uint SampleRate, const double SamplePos, const float CurrentPitch) { |
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Stage = stage_attack; |
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Segment = segment_lin; |
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// Measurements of GSt output shows that the real attack time |
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// is about 65.5% of the value specified in the gig file. |
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StepsLeft = (int) (0.655f * AttackTime * SampleRate); |
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if (StepsLeft) { |
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Level = (float) PreAttack / 1000.0; |
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Coeff = 0.896f * (1.0f - Level) / StepsLeft; // max level is a bit lower if attack != 0 |
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} else { // immediately jump to the next stage |
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if (HoldAttack) enterAttackHoldStage(SamplePos, CurrentPitch); |
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else enterDecay1Part1Stage(SampleRate); |
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} |
} |
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PostponedEvent = (event_t) -1; // init with anything except release or cancel_release |
210 |
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} |
211 |
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void EGADSR::enterAttackHoldStage(const double SamplePos, const float CurrentPitch) { |
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Stage = stage_attack_hold; |
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Segment = segment_lin; |
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Coeff = 0.0f; // don't rise anymore |
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StepsLeft = (int) (LoopStart - SamplePos / CurrentPitch); // FIXME: just an approximation, inaccuracy grows with higher audio fragment size, sufficient for usual fragment sizes though |
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} |
218 |
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// calculate decay1 stage parameters (exp. curve) |
void EGADSR::enterDecay1Part1Stage(const uint SampleRate) { |
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Decay1StepsLeft = (long) (Decay1Time * pEngine->pAudioOutputDevice->SampleRate()); |
// The decay1 and release stage both consist of two parts, |
221 |
Decay1Coeff = (Decay1StepsLeft) ? exp(log(this->SustainLevel) / (double) Decay1StepsLeft) - 1.0 |
// first a linear curve, f, followed by an exponential curve, |
222 |
: 0.0; |
// g: |
223 |
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// |
224 |
// calculate decay2 stage parameters (exp. curve) |
// f(x + d) = f(x) + Coeff |
225 |
if (!InfiniteSustain) { |
// g(x + d) = Coeff2 * g(x) + Coeff3 |
226 |
if (Decay2Time < EG_MIN_RELEASE_TIME) Decay2Time = EG_MIN_RELEASE_TIME; |
// |
227 |
long Decay2Steps = (long) (Decay2Time * pEngine->pAudioOutputDevice->SampleRate()); |
// (where d is 1/SampleRate). The transition from f to g is |
228 |
Decay2Coeff = (Decay2Steps) ? exp((log(EG_ENVELOPE_LIMIT) - log(this->SustainLevel)) / Decay2Steps + log(this->SustainLevel)) - this->SustainLevel |
// done when f(x) has reached Level2 = 25% of full volume. |
229 |
: 0.0; |
StepsLeft = (int) (Decay1Time * SampleRate); |
230 |
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if (StepsLeft && SustainLevel < 1.0) { |
231 |
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Stage = stage_decay1_part1; |
232 |
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Segment = segment_lin; |
233 |
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Decay1Slope = 1.365 * (SustainLevel - 1.0) / StepsLeft; |
234 |
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Coeff = Decay1Slope * invVolume; |
235 |
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Decay1Level2 = 0.25 * invVolume; |
236 |
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StepsLeft = int((RTMath::Max(Decay1Level2, SustainLevel) - Level) / Coeff); |
237 |
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} else { |
238 |
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Level = SustainLevel; |
239 |
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if (InfiniteSustain) enterSustainStage(); |
240 |
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else enterDecay2Stage(SampleRate); |
241 |
} |
} |
242 |
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} |
243 |
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244 |
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void EGADSR::enterDecay1Part2Stage() { |
245 |
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Stage = stage_decay1_part2; |
246 |
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Segment = segment_exp; |
247 |
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Decay1Slope *= 3.55; |
248 |
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Coeff = exp(Decay1Slope); |
249 |
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Offset = ExpOffset * (1 - Coeff); |
250 |
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Level = Decay1Level2; |
251 |
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StepsLeft = int(log((SustainLevel - ExpOffset) / (Level - ExpOffset)) / Decay1Slope); |
252 |
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} |
253 |
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254 |
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void EGADSR::enterDecay2Stage(const uint SampleRate) { |
255 |
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Stage = stage_decay2; |
256 |
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Segment = segment_lin; |
257 |
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Decay2Time = RTMath::Max(Decay2Time, CONFIG_EG_MIN_RELEASE_TIME); |
258 |
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StepsLeft = (int) (Decay2Time * SampleRate); |
259 |
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Coeff = (-1.03 / StepsLeft) * invVolume; |
260 |
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//FIXME: do we really have to calculate 'StepsLeft' two times? |
261 |
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StepsLeft = int((CONFIG_EG_BOTTOM - Level) / Coeff); |
262 |
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} |
263 |
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264 |
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void EGADSR::enterSustainStage() { |
265 |
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Stage = stage_sustain; |
266 |
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Segment = segment_lin; |
267 |
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Coeff = 0.0f; // don't change the envelope level in this stage |
268 |
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const int intMax = (unsigned int) -1 >> 1; |
269 |
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StepsLeft = intMax; // we use the highest value possible (we refresh StepsLeft in update() in case) |
270 |
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} |
271 |
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272 |
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void EGADSR::enterReleasePart1Stage() { |
273 |
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Stage = stage_release_part1; |
274 |
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Segment = segment_lin; |
275 |
|
StepsLeft = int((ReleaseLevel2 - Level) / ReleaseCoeff); |
276 |
|
Coeff = ReleaseCoeff; |
277 |
|
} |
278 |
|
|
279 |
|
void EGADSR::enterReleasePart2Stage() { |
280 |
|
Stage = stage_release_part2; |
281 |
|
Segment = segment_exp; |
282 |
|
StepsLeft = int(log((CONFIG_EG_BOTTOM - ExpOffset) / (Level - ExpOffset)) / ReleaseSlope); |
283 |
|
Coeff = ReleaseCoeff2; |
284 |
|
Offset = ReleaseCoeff3; |
285 |
|
} |
286 |
|
|
287 |
// calculate release stage parameters (exp. curve) |
void EGADSR::enterFadeOutStage() { |
288 |
if (ReleaseTime < EG_MIN_RELEASE_TIME) ReleaseTime = EG_MIN_RELEASE_TIME; // to avoid click sounds at the end of the sample playback |
Stage = stage_fadeout; |
289 |
ReleaseStepsLeft = (long) (ReleaseTime * pEngine->pAudioOutputDevice->SampleRate()); |
Segment = segment_lin; |
290 |
ReleaseCoeff = exp((log(EG_ENVELOPE_LIMIT) - log(this->SustainLevel)) / ReleaseStepsLeft + log(this->SustainLevel)) - this->SustainLevel; |
StepsLeft = int(Level / (-FadeOutCoeff)); |
291 |
|
Coeff = FadeOutCoeff; |
292 |
|
} |
293 |
|
|
294 |
dmsg(4,("PreAttack=%d, AttackLength=%d, AttackCoeff=%f, Decay1Coeff=%f, Decay2Coeff=%f, ReleaseLength=%d, ReleaseCoeff=%f\n", |
void EGADSR::enterEndStage() { |
295 |
PreAttack, AttackStepsLeft, AttackCoeff, Decay1Coeff, Decay2Coeff, ReleaseStepsLeft, ReleaseCoeff)); |
Stage = stage_end; |
296 |
|
Segment = segment_end; |
297 |
} |
} |
298 |
|
|
299 |
}} // namespace LinuxSampler::gig |
}} // namespace LinuxSampler::gig |