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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 - 2007 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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EGADSR::EGADSR(gig::Engine* pEngine, Event::destination_t ModulationDestination) { |
EGADSR::EGADSR() { |
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this->pEngine = pEngine; |
enterEndStage(); |
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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 / CONFIG_DEFAULT_SUBFRAGMENT_SIZE; |
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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 Samples - 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 pTriggerEvent - event that caused triggering of the voice (only if |
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* the voices 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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*/ |
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void EGADSR::Process(uint Samples, RTEList<Event>* pEvents, Event* pTriggerEvent, double SamplePos, double CurrentPitch) { |
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Event* pTransitionEvent; |
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if (pTriggerEvent) { |
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pEvents->set_current(pTriggerEvent); |
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pTransitionEvent = pEvents->next(); |
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} |
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else { |
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pTransitionEvent = pEvents->first(); |
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} |
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int iSample = TriggerDelay; |
void EGADSR::update(event_t Event, uint SampleRate) { |
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while (iSample < Samples) { |
if (Event == event_hold_end) HoldAttack = false; |
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switch (Stage) { |
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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); |
switch (Event) { |
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int process_end = iSample + to_process; |
case event_release: |
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AttackStepsLeft -= to_process; |
enterReleasePart1Stage(); |
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while (iSample < process_end) { |
break; |
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Level += AttackCoeff; |
case event_cancel_release: |
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pEngine->pSynthesisParameters[ModulationDestination][iSample++] *= Level; |
enterSustainStage(); |
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} |
break; |
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if (iSample == Samples) { // postpone last transition event for the next audio fragment |
case event_stage_end: |
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Event* pLastEvent = pEvents->last(); |
if (HoldAttack) |
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if (pLastEvent) ReleasePostponed = (pLastEvent->Type == Event::type_release); |
enterAttackHoldStage(); |
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} |
else |
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if (!AttackStepsLeft) Stage = (ReleasePostponed) ? stage_release : (HoldAttack) ? stage_attack_hold : stage_decay1; |
enterDecay1Part1Stage(SampleRate); |
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break; |
break; |
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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: {// just refresh time |
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const int intMax = (unsigned int) -1 >> 1; |
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StepsLeft = intMax; // we use the highest possible value |
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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 |
case event_hold_end: |
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int to_process = RTMath::Min(holdstepsleft, Samples - iSample); |
enterDecay1Part1Stage(SampleRate); |
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int process_end = iSample + to_process; |
break; |
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if (pTransitionEvent && pTransitionEvent->FragmentPos() <= process_end) { |
case event_release: |
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process_end = pTransitionEvent->FragmentPos(); |
enterReleasePart1Stage(); |
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Stage = (pTransitionEvent->Type == Event::type_release) ? stage_release : (InfiniteSustain) ? stage_sustain : stage_decay2; |
break; |
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pTransitionEvent = pEvents->next(); |
case event_cancel_release: |
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} |
if (InfiniteSustain) |
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else if (to_process == holdstepsleft) Stage = stage_decay1; |
enterSustainStage(); |
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while (iSample < process_end) { |
else |
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pEngine->pSynthesisParameters[ModulationDestination][iSample++] *= Level; |
enterDecay1Part1Stage(SampleRate); |
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} |
break; |
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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 (pTransitionEvent && pTransitionEvent->FragmentPos() <= process_end) { |
case event_stage_end: |
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process_end = pTransitionEvent->FragmentPos(); |
enterDecay1Part2Stage(SampleRate); |
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Stage = (pTransitionEvent->Type == Event::type_release) ? stage_release : (InfiniteSustain) ? stage_sustain : stage_decay2; |
break; |
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pTransitionEvent = pEvents->next(); |
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 (pTransitionEvent && pTransitionEvent->Type == Event::type_release && pTransitionEvent->FragmentPos() <= Samples) { |
switch (Event) { |
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process_end = pTransitionEvent->FragmentPos(); |
case event_release: |
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pTransitionEvent = pEvents->next(); |
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 (Level < CONFIG_EG_BOTTOM) |
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Level += Level * Decay2Coeff; |
enterEndStage(); |
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pEngine->pSynthesisParameters[ModulationDestination][iSample++] *= Level; |
else if (InfiniteSustain) |
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} |
enterSustainStage(); |
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if (Level <= EG_ENVELOPE_LIMIT) Stage = stage_end; |
else |
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break; |
enterDecay2Stage(SampleRate); |
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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 (pTransitionEvent && pTransitionEvent->Type == Event::type_release && pTransitionEvent->FragmentPos() <= Samples) { |
switch (Event) { |
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process_end = pTransitionEvent->FragmentPos(); |
case event_stage_end: |
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pTransitionEvent = pEvents->next(); |
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; |
case event_hold_end: |
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} |
enterDecay1Part1Stage(SampleRate); |
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break; |
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 (pTransitionEvent && pTransitionEvent->Type == Event::type_cancel_release && pTransitionEvent->FragmentPos() <= Samples) { |
switch (Event) { |
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process_end = pTransitionEvent->FragmentPos(); |
case event_stage_end: {// just refresh time |
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pTransitionEvent = pEvents->next(); |
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_end; |
case event_release: |
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break; |
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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} |
} |
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case stage_end: { |
break; |
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while (iSample < Samples) { |
case stage_release_part1: |
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Level += Level * ReleaseCoeff; |
switch (Event) { |
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pEngine->pSynthesisParameters[ModulationDestination][iSample++] *= Level; |
case event_stage_end: |
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} |
enterReleasePart2Stage(); |
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break; |
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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enterDecay2Stage(SampleRate); |
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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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case event_stage_end: |
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enterFadeOutStage(); |
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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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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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} |
} |
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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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*/ |
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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; |
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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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// calculate release stage parameters (lin+exp curve) |
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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 |
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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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enterAttackStage(PreAttack, AttackTime, SampleRate); |
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} |
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void EGADSR::enterAttackStage(const uint PreAttack, const float AttackTime, const uint SampleRate) { |
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Stage = stage_attack; |
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Segment = segment_lin; |
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if (AttackTime >= 0.0005f) { |
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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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// The minimum attack value used is 0.032. |
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StepsLeft = int(0.655f * RTMath::Max(AttackTime, 0.032f) * SampleRate); |
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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 { // attack is zero - immediately jump to the next stage |
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Level = 1.029f; // a bit higher than max sustain |
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if (HoldAttack) enterAttackHoldStage(); |
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else enterDecay1Part1Stage(SampleRate); |
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} |
} |
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else { |
} |
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Level = 1.0; |
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AttackCoeff = 0.0; |
void EGADSR::enterAttackHoldStage() { |
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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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const int intMax = (unsigned int) -1 >> 1; |
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StepsLeft = intMax; // we use the highest value possible (we refresh StepsLeft in update() in case) |
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} |
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void EGADSR::enterDecay1Part1Stage(const uint SampleRate) { |
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// The decay1 and release stage both consist of two parts, |
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// first a linear curve, f, followed by an exponential curve, |
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// g: |
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// |
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// f(x + d) = f(x) + Coeff |
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// g(x + d) = Coeff2 * g(x) + Coeff3 |
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// |
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// (where d is 1/SampleRate). The transition from f to g is |
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// done when f(x) has reached Level2 = 25% of full volume. |
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StepsLeft = (int) (Decay1Time * SampleRate); |
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if (StepsLeft && Level > SustainLevel) { |
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Stage = stage_decay1_part1; |
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Segment = segment_lin; |
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Decay1Slope = (1.347f * SustainLevel - 1.361f) / StepsLeft; |
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Coeff = Decay1Slope * invVolume; |
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Decay1Level2 = 0.25 * invVolume; |
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StepsLeft = int((RTMath::Max(Decay1Level2, SustainLevel) - Level) / Coeff); |
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if (StepsLeft <= 0) enterDecay1Part2Stage(SampleRate); |
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} else { |
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if (InfiniteSustain) enterSustainStage(); |
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else enterDecay2Stage(SampleRate); |
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} |
} |
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} |
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// calculate decay1 stage parameters (exp. curve) |
void EGADSR::enterDecay1Part2Stage(const uint SampleRate) { |
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Decay1StepsLeft = (long) (Decay1Time * pEngine->pAudioOutputDevice->SampleRate()); |
if (SustainLevel < Decay1Level2) { |
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Decay1Coeff = (Decay1StepsLeft) ? exp(log(this->SustainLevel) / (double) Decay1StepsLeft) - 1.0 |
Stage = stage_decay1_part2; |
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: 0.0; |
Segment = segment_exp; |
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Decay1Slope *= 3.55; |
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// calculate decay2 stage parameters (exp. curve) |
Coeff = exp(Decay1Slope); |
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if (!InfiniteSustain) { |
Offset = ExpOffset * (1 - Coeff); |
260 |
if (Decay2Time < EG_MIN_RELEASE_TIME) Decay2Time = EG_MIN_RELEASE_TIME; |
StepsLeft = int(log((SustainLevel - ExpOffset) / (Level - ExpOffset)) / Decay1Slope); |
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long Decay2Steps = (long) (Decay2Time * pEngine->pAudioOutputDevice->SampleRate()); |
if (StepsLeft > 0) return; |
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Decay2Coeff = (Decay2Steps) ? exp((log(EG_ENVELOPE_LIMIT) - log(this->SustainLevel)) / Decay2Steps + log(this->SustainLevel)) - this->SustainLevel |
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: 0.0; |
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} |
} |
263 |
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if (InfiniteSustain) enterSustainStage(); |
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else enterDecay2Stage(SampleRate); |
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} |
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void EGADSR::enterDecay2Stage(const uint SampleRate) { |
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Stage = stage_decay2; |
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Segment = segment_lin; |
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Decay2Time = RTMath::Max(Decay2Time, 0.05f); |
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StepsLeft = (int) (Decay2Time * SampleRate); |
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Coeff = (-1.03 / StepsLeft) * invVolume; |
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//FIXME: do we really have to calculate 'StepsLeft' two times? |
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StepsLeft = int((CONFIG_EG_BOTTOM - Level) / Coeff); |
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if (StepsLeft <= 0) enterEndStage(); |
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} |
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void EGADSR::enterSustainStage() { |
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Stage = stage_sustain; |
280 |
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Segment = segment_lin; |
281 |
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Coeff = 0.0f; // don't change the envelope level in this stage |
282 |
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const int intMax = (unsigned int) -1 >> 1; |
283 |
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StepsLeft = intMax; // we use the highest value possible (we refresh StepsLeft in update() in case) |
284 |
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} |
285 |
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286 |
// calcuate release stage parameters (exp. curve) |
void EGADSR::enterReleasePart1Stage() { |
287 |
if (ReleaseTime < EG_MIN_RELEASE_TIME) ReleaseTime = EG_MIN_RELEASE_TIME; // to avoid click sounds at the end of the sample playback |
Stage = stage_release_part1; |
288 |
ReleaseStepsLeft = (long) (ReleaseTime * pEngine->pAudioOutputDevice->SampleRate()); |
Segment = segment_lin; |
289 |
ReleaseCoeff = exp((log(EG_ENVELOPE_LIMIT) - log(this->SustainLevel)) / ReleaseStepsLeft + log(this->SustainLevel)) - this->SustainLevel; |
StepsLeft = int((ReleaseLevel2 - Level) / ReleaseCoeff); |
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Coeff = ReleaseCoeff; |
291 |
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if (StepsLeft <= 0) enterReleasePart2Stage(); |
292 |
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} |
293 |
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294 |
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void EGADSR::enterReleasePart2Stage() { |
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Stage = stage_release_part2; |
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Segment = segment_exp; |
297 |
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StepsLeft = int(log((CONFIG_EG_BOTTOM - ExpOffset) / (Level - ExpOffset)) / ReleaseSlope); |
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Coeff = ReleaseCoeff2; |
299 |
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Offset = ReleaseCoeff3; |
300 |
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if (StepsLeft <= 0) enterFadeOutStage(); |
301 |
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} |
302 |
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303 |
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void EGADSR::enterFadeOutStage() { |
304 |
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Stage = stage_fadeout; |
305 |
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Segment = segment_lin; |
306 |
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StepsLeft = int(Level / (-FadeOutCoeff)); |
307 |
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Coeff = FadeOutCoeff; |
308 |
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if (StepsLeft <= 0) enterEndStage(); |
309 |
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} |
310 |
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311 |
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void EGADSR::enterFadeOutStage(int maxFadeOutSteps) { |
312 |
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Stage = stage_fadeout; |
313 |
|
Segment = segment_lin; |
314 |
|
StepsLeft = int(Level / (-FadeOutCoeff)); |
315 |
|
if (StepsLeft > maxFadeOutSteps) { |
316 |
|
StepsLeft = maxFadeOutSteps; |
317 |
|
Coeff = -Level / maxFadeOutSteps; |
318 |
|
} else { |
319 |
|
Coeff = FadeOutCoeff; |
320 |
|
} |
321 |
|
if (StepsLeft <= 0) enterEndStage(); |
322 |
|
} |
323 |
|
|
324 |
dmsg(4,("PreAttack=%d, AttackLength=%d, AttackCoeff=%f, Decay1Coeff=%f, Decay2Coeff=%f, ReleaseLength=%d, ReleaseCoeff=%f\n", |
void EGADSR::enterEndStage() { |
325 |
PreAttack, AttackStepsLeft, AttackCoeff, Decay1Coeff, Decay2Coeff, ReleaseStepsLeft, ReleaseCoeff)); |
Stage = stage_end; |
326 |
|
Segment = segment_end; |
327 |
|
Level = 0; |
328 |
} |
} |
329 |
|
|
330 |
}} // namespace LinuxSampler::gig |
}} // namespace LinuxSampler::gig |